# Hebei Yajiada Import and Export Co., LTD

> Pipe flange and butt-weld fitting manufacturer in Cangzhou, Hebei, China.
> Established 2008. 50,000 T/YR forging capacity. ISO 9001:2015
> (Cert 00215Q20319R0M), PED 2014/68/EU Module H (TÜV Rheinland
> PED-2017-0042), ISIRI 9117 marking, NACE MR0175 compliant.
> Six product families — Weld Neck (WN), Slip-On (SO), Blind (BL),
> Socket-Weld (SW), Threaded (Th), Plate (PL) — across four standard
> systems: ASME B16.5/B16.47, EN 1092-1:2018, JIS B2220, ISIRI 9117,
> plus GOST 12820-12821, HG/T 20592-2009, BS 4504, BS 10. Exporting
> to 60+ countries. Six-mode logistics: FOB Tianjin, CIF worldwide,
> documentary credit (L/C), T/T 30-70, PayPal samples. Languages:
> English, Chinese, Farsi (Iran), Russian, Arabic, Spanish, Portuguese.

## Primary pages

- [About Hebei Yajiada // 18-Year Manufacturer · Cangzhou · 50,000 T/YR](https://hbyagada.com/about): Pipe flange & butt-weld fittings manufacturer since 2008. ISO 9001, PED, ISIRI 9117, NACE MR0175. Export 60+ countries.
- [Certificates & Compliance // ISO · PED · ISIRI](https://hbyagada.com/certificates): ISO 9001, PED 2014/68/EU, ISIRI 9117, API 6D & NACE MR0175 certifications. Third-party audited. Mill certs available.
- [Global Shipping // Iran · UAE · Saudi · Turkey](https://hbyagada.com/shipping): Sea freight routes from China to Bandar Abbas, Jebel Ali, Dammam, Izmit, Shuwaikh, Hamad. FOB / CIF quotes available.
- [Engineering Notes · Flange Standards & Materials // Hebei Yajiada](https://hbyagada.com/blog): In-depth engineering articles on flange standards (ASME B16.5, EN 1092-1, JIS B2220, GOST, ISIRI 9117), material selection (A105, A350 LF2, 16MnDR, 304, 316), sealing (RF, FF, RTJ), and procurement guidance.
- [Flange Manufacturer · ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/): Pipe flange manufacturer in China. ASME B16.5 / EN 1092-1 / JIS / ISIRI 9117. Six types: WN, SO, BL, SW, Th, PL. 60+ countries.

## Product catalog (six families, four standard systems)

- [Weld Neck Flange Manufacturer in China · ASME B16.5 / B16.47 · Hebei Yajiada](https://hbyagada.com/products/weld-neck-flange): Weld Neck Flange (WN) manufacturer in China. High structural strength, deformation-resistant, reliable sealing. Suitable for high-temperature, high-pressure, and large temperature/pressure fluctuation services. Standards: ASME B16.5 / B16.47, EN 1092-1 Type 11, JIS B2220 WN, GB · HG. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.
- [Slip-On Flange Manufacturer in China · ASME B16.5 · Hebei Yajiada](https://hbyagada.com/products/slip-on-flange): Slip-On Flange (SO) manufacturer in China. Easy field installation; the short hub improves rigidity and load capacity. Overall performance is superior to Plate (PL) flanges. Standards: ASME B16.5, EN 1092-1 Type 01, JIS B2220 SOH, GB · HG. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.
- [Socket-Weld Flange Manufacturer in China · ASME B16.5 · Hebei Yajiada](https://hbyagada.com/products/socket-weld-flange): Socket-Weld Flange (SW) manufacturer in China. Pipe is inserted into a stepped bore and welded. Commonly used for small-bore (DN ≤ 40) and higher-pressure (≤ 10.0 MPa) piping. Standards: ASME B16.5, EN 1092-1, JIS B2220 SW, GB · HG. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.
- [Threaded Flange Manufacturer in China · ASME B16.5 · Hebei Yajiada](https://hbyagada.com/products/threaded-flange): Threaded Flange (Th) manufacturer in China. Internally threaded bore for screw connection to the pipe — no welding required. Easy to install and remove. Not suitable for high-temperature, high-pressure, or heavy-vibration service. Standards: ASME B16.5, EN 1092-1 Type 13, JIS B2220 TR, GB · HG. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.
- [Blind Flange Manufacturer in China · ASME B16.5 / B16.47 · Hebei Yajiada](https://hbyagada.com/products/blind-flange): Blind Flange (BL) manufacturer in China. No center bore; used to seal off pipe or vessel openings. Standards: ASME B16.5 / B16.47, EN 1092-1 Type 05, JIS B2220 BL, GB · HG. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.
- [Plate Flat-Weld Flange Manufacturer in China · GB · HG · JB · Hebei Yajiada](https://hbyagada.com/products/plate-flange): Plate Flat-Weld Flange (PL) manufacturer in China. Simple manufacturing, lowest cost, lower rigidity. Suitable for low-pressure, ambient-temperature, mild-service applications. Standards: GB · HG · JB. Carbon steel / stainless / 16MnDR. MTC EN 10204 3.1. PDF spec downloadable.

## Engineering blog (19 articles, 2026)

- [16MnDR Low-Temperature Flange: 4 Real Production Details // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/16mndr-lng-cryogenic): GB 3531, -40℃ impact, normalize + temper, post-weld stress relief.
- [6 Types of Pipe Flanges: WN, SO, BL, SW, Th, PL Explained // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/6-types-of-pipe-flanges): The six flange types every EPC engineer specifies. Standards, applications, and how to pick the right one.
- [ASTM A105 vs A350 LF2: How to Pick the Right Carbon Steel // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/a105-vs-a350-lf2-carbon-steel): Both are carbon steel, both are common — but they are not interchangeable. Here is the rule.
- [A105 vs A350 LF2: When Carbon Steel Spec Determines Sour Service Survival // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/a105-vs-a350-lf2-chemical-composition-sourcing): Engineering Notes 03 · Long-tail keyword "A105 vs A350 LF2 difference"
- [ASME B16.5 Complete Specification Guide: Classes, Sizes, Materials & Tolerances // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/asme-b16-5-complete-specification-guide): Everything an EPC buyer needs in one place — pressure-temperature ratings, dimensions, materials, and what the standard does not tell you.
- [ASME B16.47 vs B16.5: When Large Bore Needs a Different Standard // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/asme-b1647-vs-b165-large-bore): NPS 26 and above: B16.5 is not enough. Here is the working split.
- [ASME B16.5 vs EN 1092-1: The 6 Questions EPC Buyers Ask Most // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/asme-b165-vs-en-1092): Which standard for Middle East EPC projects? Here is the working answer.
- [EN 1092-1 vs JIS B2220 Cross-Reference: PN-K Class, Bolt Patterns, Facing // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/en-1092-1-vs-jis-b2220-cross-reference): How to read a European flange drawing against a Japanese one — and what happens when you try to bolt them together.
- [Flange Bolt Torque Calculation: ASME PCC-1 vs EN 1591-1 vs API 6D — Data-Driven Methodology for Bolted Joint Integrity // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/flange-bolt-torque-calculation-asme-b165-vs-en-1591): How to compute torque that actually holds pressure, citing PCC-1-2010, EN 1591-1:2013, and ASME B16.5-2020 §6.4 with worked numbers.
- [Flange Bolt Torque & Gasket Selection: The Field-Ready Working Tables // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/flange-bolt-torque-gasket-selection): How much to torque, which gasket for which service, and the three mistakes crews make most often.
- [Flange Certifications Explained: ISO 9001, PED, ISIRI, NACE — Without the Marketing Hype // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/flange-certifications-iso-ped-isiri): How to read each one, what it actually certifies, and how to verify.
- [Flange Facing Types: RF vs FF vs RTJ — How to Pick // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/flange-facing-types-rf-ff-rtj): Three letters that decide whether your pipeline leaks. The field-proven guide.
- [Forged vs Cast Flange: Manufacturing Method Matters // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/forged-vs-cast-flange): Same drawing, very different material properties. The buyer-side checklist.
- [ISIRI 9117 Iran Import: 3 Things to Prepare Before You Ship // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/isiri-9117-iran-import): Iran Customs EPL three-path system, IC, and Order Registration — the working checklist.
- [ISIRI 9117 Marking: How Iran-Bound Flanges Pass Bandar Abbas Customs in 4 Hours, Not 4 Days // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/isiri-9117-marking-iran-customs-procedure): Engineering Notes 05 · Long-tail keyword "ISIRI 9117 marking import documentation Iran"
- [MTC 3.1 vs 3.2: The Difference That Costs Buyers Six Figures When Missing // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/mtc-3-1-vs-3-2-mill-test-certificate-difference): Engineering Notes 04 · Long-tail keyword "MTC 3.1 vs 3.2 difference EN 10204"
- [NACE MR0175 Is Not a "Certificate": 4 Things Buyers Get Wrong // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/nace-mr0175-sour-service): A material specification, not a product certificate. The real limits buyers miss.
- [PED 2014/68/EU CE Marked Flange: 7 Things Buyers Verify Before Placing the Order // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/ped-2014-68-eu-ce-marked-flange-manufacturer): A working guide for procurement teams sourcing flanges into the EU + Turkey + EEA markets.
- [Stainless Steel Flange Selection: 304 vs 316 vs 321 vs 347 vs Duplex // Hebei Yajiada Engineering Notes](https://hbyagada.com/blog/stainless-steel-flange-selection-304-316-321-347): How to pick the right austenitic stainless grade for chloride, temperature, and welding — without overpaying.

## Buyer Q&A (5 in-depth longer-form answers)

- [Flange Manufacturer // ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/ask/best-flange-supplier-power-plant-china): Hebei Yajiada — manufacturer of pipe flanges and butt-weld fittings.
- [Flange Manufacturer // ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/ask/how-do-i-import-pipe-flanges-from-china-to-iran): Hebei Yajiada — manufacturer of pipe flanges and butt-weld fittings.
- [Flange Manufacturer // ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/ask/where-to-buy-asme-b16-5-flanges-ped-ce-marked): Hebei Yajiada — manufacturer of pipe flanges and butt-weld fittings.
- [Flange Manufacturer // ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/ask/where-to-supply-16mndr-lng-cryogenic-flanges): Hebei Yajiada — manufacturer of pipe flanges and butt-weld fittings.
- [Flange Manufacturer // ASME B16.5 · EN 1092-1 · ISIRI 9117](https://hbyagada.com/ask/who-manufactures-nace-mr0175-flanges-china): Hebei Yajiada — manufacturer of pipe flanges and butt-weld fittings.

## Legal and compliance

- [Privacy Policy // GDPR-Compliant · Hebei Yajiada](https://hbyagada.com/privacy-policy): Privacy policy for hbyagada.com. GDPR-compliant data handling, retention periods, third-party processors, your rights under Articles 15-22 GDPR.
- [Terms of Sale // B2B Flange Supply · Incoterms 2020](https://hbyagada.com/terms): General terms of sale for pipe flanges and fittings. Quotation validity, payment (T/T, L/C), Incoterms 2020, MTC 3.1, warranty, CIETAC arbitration.
- [Cookie Policy // hbyagada.com](https://hbyagada.com/cookies): Cookie usage on hbyagada.com. Only functional (cookie_consent) and analytics (_ga, GA4 anonymized) cookies. No advertising cookies.
- [Legal Notice / Imprint // Hebei Yajiada](https://hbyagada.com/legal): Legal notice and company information per EU E-Commerce Directive 2000/31/EC. USCC, certifications, editorial responsibility, dispute resolution.

## AI-readable structured data

- [Site summary (JSON-LD)](https://hbyagada.com/ai/summary.json): Site name, unified social credit code, founding year, 10 standards, 4 certifications, 6 product families, 6 material grades, 5 sameAs links (YouTube/Alibaba/Facebook/LinkedIn-company/LinkedIn-person).
- [Service capabilities (JSON-LD)](https://hbyagada.com/ai/service.json): 8 capabilities, 5 service categories (forged flanges, butt-weld fittings, material grades, engineering services, logistics), 4 standard systems, MOQ, lead time, payment terms.
- [Procurement FAQ (JSON-LD)](https://hbyagada.com/ai/faq.json): 30+ procurement questions with structured answers covering RFQ process, payment, delivery, MTC, packaging, after-sales.

## Site feeds

- [Site feed](https://hbyagada.com/sitemap.xml)
- [Site feed](https://hbyagada.com/llms.txt)
- [Site feed](https://hbyagada.com/rss.xml)

## Contact

- Email: mafuze@hebeiyagada.com
- WhatsApp / Tel: +86 186 3177 4440
- Address: Building 5, Songdong Industrial Park, Cangzhou, Hebei 061000, China
- Unified Social Credit Code: 91130900MA0XXXXXXX
- Alibaba: https://hebeiyajiada.en.alibaba.com/
- YouTube: https://www.youtube.com/@EdwardMA-p2t
- Facebook: https://www.facebook.com/Yajiada%20Flanges%20-%20China%20Supplier
- LinkedIn: https://www.linkedin.com/company/hbyagada/

## Optional

- [PDF spec sheets directory](https://hbyagada.com/spec-sheets/): dimensional drawings and weight/data sheets for 31 standard combinations (WN × ASME/EN/JIS/BS/HG; SO × ASME/EN/JIS/BS/HG; SW × ASME/EN/JIS/HG; Th × ASME/EN/JIS/HG; BL × ASME/EN/JIS/BS/HG; Plate × EN/JIS/BS/HG).
- [About Yajiada — full company history, workshop layout, and quality system](https://hbyagada.com/about): full company background, workshop layout, quality system, and management team.

## Companion files (Markdown versions for LLM training and RAG ingestion)

- [Hebei Yajiada full content in Markdown](https://hbyagada.com/llms-full.md): every page on hbyagada.com plus extended notes — product specifications per ASME/EN/JIS standard, material grades (A105 / A350 LF2 / A182 F304-F347 / 16MnDR / F51-F55), certifications (ISO 9001 / PED 2014/68/EU Module H / ISIRI 9117 / NACE MR0175), trade terms (Incoterms 2020 / T/T / L/C), and engineering notes from 19 in-depth blog articles. Optimized for RAG ingestion and offline LLM training.
- [Blog articles in Markdown](https://hbyagada.com/llms-full.md#engineering-blog-19-articles-2026): 19 standalone Markdown articles covering ASME B16.5 vs EN 1092-1 comparison, NACE MR0175 sour service, ISIRI 9117 Iran import, 16MnDR LNG cryogenic, A105 vs A350 LF2 selection, RTJ vs RF facing types, bolt torque calculation per PCC-1-2010 / EN 1591-1, and PED 2014/68/EU CE marking.
- [Product specifications in Markdown](https://hbyagada.com/llms-full.md#product-catalog-six-families-four-standard-systems): six flange families — WN, SO, BL, SW, Th, PL — in 31 standard × type combinations across ASME B16.5, EN 1092-1, JIS B2220, GOST 12820-12821, HG/T 20592-2009, BS 4504, and BS 10.

## Extended notes (llms-full.txt — full content for LLM training and RAG)

### About Hebei Yajiada

Hebei Yajiada Import and Export Co., LTD is a privately held Chinese foreign-trade company specialising in forged steel pipe flanges and butt-weld pipe fittings. Founded in 2008, headquartered in Cangzhou, Hebei Province — the historical "Pipe Fittings Capital" of China. The company operates two forging workshops (1,500 T/YR and 3,500 T/YR capacity), two CNC machining lines, and one heat-treatment bay (normalising, tempering, solution annealing, ageing). Annual throughput approximately 50,000 tonnes of finished flanges and fittings.

### Product families

1. Weld Neck (WN) — long-tapered-hub flange butt-welded to the pipe. Highest structural strength, suitable for high-pressure, high-temperature, and cyclic service. Standards: ASME B16.5 NPS 1/2 to 24, ASME B16.47 NPS 26 to 60, EN 1092-1 Type 11, JIS B2220 WN, GOST 12821, ISIRI 9117, HG/T 20592.
2. Slip-On (SO) — pipe slides into the bore, fillet-welded both sides. Easier field alignment than WN. Standards: ASME B16.5, EN 1092-1 Type 01, JIS B2220 SOH, GOST 12820, BS 4504, HG/T 20592.
3. Blind (BL) — solid disc used to terminate piping or seal a vessel opening. Standards: ASME B16.5, ASME B16.47, EN 1092-1 Type 05, JIS B2220 BL, GOST 12821, ISIRI 9117, HG/T 20592.
4. Socket-Weld (SW) — pipe inserted into a stepped socket bore and welded. Typically NPS 1/2 to 2, Class 300–600. Standards: ASME B16.5, EN 1092-1, JIS B2220 SW, HG/T 20592.
5. Threaded (Th) — internally threaded bore for screw-on pipe. No welding. Easy disassembly. Limited to low-pressure, ambient service per ASME B31.3 §A330. Standards: ASME B16.5, EN 1092-1 Type 13, JIS B2220 TR, HG/T 20592.
6. Plate Flat-Weld (PL) — flat disc with no hub. Lowest cost, lowest rigidity. Limited to low-pressure, ambient, non-toxic service. Standards: EN 1092-1 Type 01, JIS B2220 SOP, BS 4504, BS 10, HG/T 20592.

### Material grades regularly supplied

A105 (ASTM A105/A105M-21, carbon steel forging, Rp0.2 ≥ 250 MPa, Rm 485-655 MPa)
A350 LF2 Cl.1 (ASTM A350/A350M-18, low-temp carbon steel, -46°C impact qualified, Rp0.2 ≥ 250 MPa)
A182 F304 / F304L / F316 / F316L (ASTM A182/A182M-23, austenitic stainless, Rp0.2 ≥ 170-205 MPa)
A182 F321 / F347 (Ti-stabilised / Nb-stabilised austenitic, for high-temp service)
A182 F11 / F22 (Cr-Mo alloy, for high-temp power and petrochemical service)
A182 F51 (Duplex 2205, Rp0.2 ≥ 450 MPa, Rm 620-880 MPa)
A182 F55 (Super duplex 2507, for chloride / seawater service)
16MnDR (GB/T 3531-2014, low-temp steel for -40°C and -46°C LNG service)
09MnNiDR (for -70°C ethylene and LNG service)

### Quality system and certifications

ISO 9001:2015 (Cert 00215Q20319R0M, scope: design and manufacture of pipe flanges and butt-weld fittings)
PED 2014/68/EU Module H (TÜV Rheinland PED-2017-0042, CE marking for Category I-IV pressure equipment flanges)
ISIRI 9117 (mandatory marking and conformity for Iran import, valid through annual renewal)
NACE MR0175 / ISO 15156 compliance (for sour service H2S-containing environments, materials tested per NACE Annex A)
EN 10204:2004 type 3.1 Mill Test Certificate (issued with every shipment)

### Export and trade

Active export markets: Iran, UAE, Saudi Arabia, Turkey, Kuwait, Qatar, Egypt, Russia, Kazakhstan, Brazil, USA, Germany, Netherlands, South Korea, Indonesia, Vietnam, Thailand, India, Pakistan, Bangladesh, and 40+ additional countries. Trade terms: FOB Tianjin / Shanghai, CIF destination port, EXW Cangzhou. Payment: T/T 30% deposit + 70% balance against B/L copy, L/C at sight for orders above USD 50,000, O/A for repeat buyers. Standard lead time 15-20 days for in-stock raw material, 25-35 days for standard catalog with new procurement, 30-45 days for custom machining.

### Standards covered (full inventory)

ASME B16.5-2020 (NPS 1/2 to 24, Class 150 to 2500); ASME B16.47-2020 (NPS 26 to 60, Series A and B); EN 1092-1:2018 (DN 10 to 4000, PN 6 to PN 400, all Types 01-21); JIS B2220:2012 (5K to 40K, all types); JIS B2238:2012 (cast iron); GOST 12820-80 / GOST 12821-80 (CIS countries); ISIRI 9117 (current edition, mandatory for Iran import); HG/T 20592-2009 (China chemical industry, PN series); BS 4504 (UK legacy, PN series); BS 10 (UK legacy, table ratings).

### Standards referenced for material and testing

ASTM A105/A105M-21, A350/A350M-18, A182/A182M-23, A193/A193M-24, A194/A194M-23, A320/A320M-23, A216/A216M-21, A352/A352M-21, A515/A515M-17, A516/A516M-16, A240/A240M-23; ASME PCC-1-2010 (bolted joint assembly), ASME B16.20-2017 (gaskets), ASME B16.21-2021 (non-metallic gaskets), ASME B16.34-2020 (valve compatibility), ASME B31.1 / B31.3 (piping codes); EN 1514-1:1997, EN 1591-1:2013, EN 13555:2014, EN 13480 (metallic industrial piping); NACE MR0175 / ISO 15156-3:2020 (sour service); ISO 6789-1:2017 (torque-wrench calibration).


## Detailed product specifications (per ASME / EN / JIS standard)

### WN — Weld Neck Flange

Long-tapered hub flange butt-welded to the pipe. Hub length per ASME B16.5 §6.1 = 3× NPS or 300 mm, whichever is shorter (Class 150-300); up to 230 mm for Class 600+. Bore matches pipe ID + 1.6 mm clearance for fit-up. Used for high-pressure, high-temperature, and cyclic service. The butt-weld provides full structural strength matching the pipe. Standards: ASME B16.5 NPS 1/2 to 24, ASME B16.47 NPS 26 to 60, EN 1092-1 Type 11 (B1 raised face), JIS B2220 WN, GOST 12821, ISIRI 9117, HG/T 20592-2009.

- Pressure class: ASME Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500. EN PN 6 / 10 / 16 / 25 / 40 / 63 / 100.
- Size range: NPS 1/2 to NPS 60 (DN 15 to DN 1500).
- Materials: Carbon steel (A105, A350 LF2), low-alloy (A182 F11/F22), stainless (A182 F304/F316/F321/F347), duplex (A182 F51/F55), cryogenic (16MnDR, 09MnNiDR).
- Applications: Refinery hydrocracker reactors, steam turbine casings, high-pressure steam headers, LNG liquefaction columns, subsea pipeline tie-ins, sour service per NACE MR0175.

### SO — Slip-On Flange

Pipe slides into the bore, fillet-welded both inside (fillet 1) and outside (fillet 2). Easier field alignment than weld neck because the pipe does not need precision machining to match a specific bore. Lower structural strength than weld neck due to shorter hub. Standard bore = pipe OD + 1.6 mm. Standards: ASME B16.5, EN 1092-1 Type 01, JIS B2220 SOH, GOST 12820, BS 4504, HG/T 20592-2009.

- Pressure class: ASME Class 150 / 300 / 600. EN PN 6 / 10 / 16 / 25 / 40.
- Size range: NPS 1/2 to NPS 24 (DN 15 to DN 600).
- Materials: Carbon steel, stainless steel, low-temperature steel per same grades as WN.
- Applications: Low-pressure process piping, water treatment, firewater systems, general utility. Not for high-cycle or high-temperature service.

### BL — Blind Flange

Solid disc with no center bore, used to terminate piping systems, seal vessel openings, and provide access for inspection. With bolted blind, the system can be reopened easily. Standards: ASME B16.5, ASME B16.47, EN 1092-1 Type 05, JIS B2220 BL, GOST 12821, ISIRI 9117, HG/T 20592-2009.

- Pressure class: ASME Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500. EN PN 6 / 10 / 16 / 25 / 40 / 63 / 100.
- Size range: NPS 1/2 to NPS 60 (DN 15 to DN 1500).
- Materials: Carbon steel (A105, A350 LF2), stainless steel (A182 F304/F316), alloy (A182 F11/F22), duplex, cryogenic.
- Applications: Pipe end termination, vessel head closure, manhole cover, test closure for pressure testing, future expansion joint in piping.

### SW — Socket-Weld Flange

Pipe inserted into a stepped socket bore (depth = 9.5 mm for NPS 1/2-2, 12.7 mm for NPS 2-1/2-3, 16 mm for NPS 4), then fillet-welded around the hub. Used primarily for small-bore, high-pressure piping where the recessed socket provides self-alignment. Standards: ASME B16.5, EN 1092-1, JIS B2220 SW, HG/T 20592-2009.

- Pressure class: ASME Class 150 / 300 / 600 / 900 / 1500.
- Size range: NPS 1/2 to NPS 3 (DN 15 to DN 80). ASME B16.5 §6.2 limits SW to NPS ≤ 3 due to crevice corrosion risk.
- Materials: Carbon steel (A105), stainless steel (A182 F304/F316).
- Applications: Instrument connections, small-bore chemical injection, sampling lines, steam tracing. Avoid in services with crevice corrosion risk.

### Th — Threaded Flange

Internally threaded bore matching the pipe thread. No welding required. Easy disassembly for maintenance. ASME B31.3 §A330.4 restricts threaded joints to low-pressure, ambient-temperature service and excludes them from severe cyclic service. Standards: ASME B16.5, EN 1092-1 Type 13, JIS B2220 TR, HG/T 20592-2009.

- Pressure class: ASME Class 150 / 300. EN PN 6 / 10 / 16.
- Size range: NPS 1/2 to NPS 4 (DN 15 to DN 100) for Class 150; NPS 1/2 to NPS 2 for Class 300.
- Materials: Carbon steel (A105), stainless steel (A182 F304/F316).
- Applications: Utility piping, compressed air lines, low-pressure water, glycol service. Not for hydrocarbons, high-temperature steam, or sour service.

### PL — Plate Flat-Weld Flange

Flat disc with no raised hub. Lowest manufacturing cost, lowest rigidity. Suitable only for low-pressure, ambient-temperature, non-cyclic service. ASME B16.5 does not include Plate flanges (they are a GB/HG/BS type only). Standards: EN 1092-1 Type 01, JIS B2220 SOP, BS 4504, BS 10 Table D/E/F, HG/T 20592-2009.

- Pressure class: EN PN 6 / 10 / 16. BS Table D / E / F.
- Size range: DN 15 to DN 600 (NPS 1/2 to NPS 24).
- Materials: Carbon steel (Q235, 20#), stainless steel (304/316).
- Applications: Drainage, vent lines, low-pressure water, fire protection, building services, mild chemical service.

## Procurement workflow (RFQ to delivery)

1. **RFQ submission** — buyer submits technical specification (standard, type, class, NPS, material, quantity, destination) via web form, WhatsApp, or email. Response within 24 hours.
2. **Quotation** — we issue Proforma Invoice (PI) including: unit price, FOB/CIF basis, payment terms (T/T 30/70, L/C at sight, or O/A for repeat buyers), lead time, third-party inspection fee (separate line if 3.2 required), validity 30 days.
3. **Sample order** — for first-time buyers, sample shipment of 2-5 pieces available against TT 100% payment; production order refunded against subsequent order.
4. **Purchase order** — buyer issues PO referencing PI. PI becomes Sales Confirmation upon our written acknowledgment.
5. **Deposit** — 30% T/T deposit received; for L/C orders, draft L/C submitted for our approval.
6. **Raw material procurement** — mill plate, billet, or bar stock sourced from approved mills (Baosteel, Shougang, TISCO for stainless; Valourec, Mannesmann for alloy). MTC 3.1 from mill.
7. **Forging** — open-die forging in 1200-tonne hammer, with forging ratio ≥ 3:1 for grain refinement. Forging temperature recorded per heat.
8. **Heat treatment** — normalising (A105), normalising + tempering (A350 LF2), solution annealing (stainless), quenching + tempering (alloy) per ASTM material standard.
9. **Machining** — CNC lathe and machining center. Facing, hub, bore, bolt holes, gasket face (RF, FF, RTJ as specified).
10. **NDT inspection** — 100% visual + dimensional. For Class 600+: 100% magnetic particle (MT) per ASME B16.5 §6.4. Optional UT/RT for sour service or nuclear.
11. **Marking** — per ASME B16.5 §6.6 (manufacturer name, material, standard, class, NPS, heat number). For ISIRI 9117 shipments: dual-language marking with Persian numerals.
12. **Final QC + MTC issuance** — dimensional final check, surface finish verification, MTC 3.1 issued with heat-traceable chemical + mechanical test results. For 3.2 orders, third-party inspector co-signs.
13. **Packaging** — plywood case with PE foam liner, ISIRI 9117 / PED / standard marking on outside, fumigation-free (ISPM 15 compliant heat treatment).
14. **Shipping** — FOB Tianjin / Shanghai (Incoterms 2020), CIF destination port, or DAP project site. Typical transit: 18-25 days to Bandar Abbas, 22-30 days to Hamburg, 12-18 days to Singapore.
15. **After-sales** — 18-month warranty from shipment date. MTC retained 10 years (PED traceability).

## Testing and inspection standards (full inventory)

Mechanical testing:
- ASTM A370 — Standard Test Methods and Definitions for Mechanical Testing of Steel Products
- ASTM E8/E8M — Standard Test Methods for Tension Testing of Metallic Materials
- ASTM E23 — Standard Test Methods for Notched Bar Impact Testing of Metallic Materials (Charpy V-notch)
- ASTM E10 — Standard Test Method for Brinell Hardness of Metallic Materials
- ASTM E18 — Standard Test Methods for Rockwell Hardness of Metallic Materials
- ASTM E92 — Standard Test Methods for Vickers Hardness of Metallic Materials
- ISO 148-1:2016 — Metallic materials — Charpy pendulum impact test
- ISO 6892-1:2019 — Metallic materials — Tensile testing at room temperature
- EN 10002-1 — Tensile testing (superseded by ISO 6892-1)

Chemical analysis:
- ASTM E415 — Standard Test Method for Analysis of Carbon and Low-Alloy Steel by Spark Atomic Emission Spectrometry
- ASTM A751 — Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
- ASTM E1086 — Standard Test Method for Analysis of Austenitic Stainless Steel by Spark Atomic Emission Spectrometry

Non-destructive testing:
- ASME Section V — Boiler and Pressure Vessel Code, Section V: Nondestructive Examination
- ASTM E709 — Standard Guide for Magnetic Particle Testing
- ASTM E165 — Standard Practice for Liquid Penetrant Testing
- ASTM E114 — Standard Practice for Ultrasonic Pulse-Echo Straight-Beam Testing of Plate
- ASTM E1106 — Standard Test Method for Magnetic Particle Testing of Steel Castings
- EN 10228-1 — Destructive tests on forgings — Surface, magnetic particle inspection
- ISO 9712:2012 — Non-destructive testing — Qualification and certification of NDT personnel

Pressure testing:
- ASME B16.5 §6.4 — hydrostatic testing of flange body (where specified by buyer)
- EN 12266 — Industrial valves — Testing of metallic valves

Dimensional inspection:
- ASME B16.5 §6.1 — dimensional tolerances
- ISO 2768-1 — General tolerances for linear and angular dimensions

## Manufacturing capabilities (workshop equipment and capacity)

Forging workshop (Workshop 1 — Hebei):
- 1 × 1-tonne free forging hammer (air-operated)
- 1 × 3-tonne free forging hammer (steam-operated)
- 2 × 1.5-tonne ring-rolling mills
- 3 × gas-fired forging furnaces (800-1200 °C)
- Annual forging capacity: 3,500 tonnes (raw blank weight)

Forging workshop (Workshop 2 — Shandong partner):
- 1 × 5-tonne free forging hammer
- 1 × 8-tonne hydraulic press
- 2 × ring-rolling mills
- 4 × gas-fired forging furnaces
- Annual forging capacity: 6,500 tonnes

Heat treatment bay:
- 6 × car-bottom heat treatment furnaces (60-tonne load capacity each)
- 2 × solution annealing furnaces for stainless steel (up to 1150 °C)
- Normalising range: 850-950 °C
- Tempering range: 550-700 °C
- Quenching: water or oil (depending on grade)

Machining shop:
- 18 × CNC vertical lathes (max swing 2,500 mm)
- 12 × CNC horizontal lathes
- 6 × 5-axis CNC machining centres
- 4 × boring machines (max bore 1,500 mm)
- Facing lathe capacity: NPS 60 (DN 1500)
- Monthly machining output: ~12,000 finished pieces

NDT and inspection:
- 100% visual + dimensional inspection (every piece)
- 100% magnetic particle testing for Class 600+
- UT (ultrasonic) for Class 900+ and nuclear service
- RT (radiographic) capability via third-party sub-contract
- Chemical analysis by SPECTRO spectrometer (in-house lab)
- Mechanical testing (tensile, impact, hardness) in-house
- Metallographic examination capability (for grain size, inclusion rating)

Quality system:
- ISO 9001:2015 (Cert 00215Q20319R0M, scope: design and manufacture of pipe flanges and butt-weld fittings; valid through 2027-03-15)
- ISO 14001:2015 Environmental Management (Cert 00215E20319R0M)
- ISO 45001:2018 Occupational Health and Safety (Cert 00215S20319R0M)
- Internal metallurgical lab accredited per ISO/IEC 17025:2017 (Cert L-XXXX-2024, scope: tensile, impact, hardness, chemical analysis)

Logistics and packaging:
- 8,000-tonne raw material warehouse with 36 m span
- 3 packing lines with custom plywood case capability
- Standard packaging: plywood case + PE foam liner + ISPM 15 compliant
- Special packaging: vacuum-sealed + desiccant for long-term storage
- Marking: per ASME B16.5 §6.6 + ISIRI 9117 §6 + PED CE marking as applicable
- Direct loading to FOB vessel at Tianjin / Shanghai / Qingdao port

## Frequently asked questions (15 buyer questions, structured answers)

**Q1: What is your minimum order quantity (MOQ)?**
For standard catalog items: 50 pieces per size is typical, but we accept smaller trial orders (10-20 pieces) for new customers. Mixed-size container loads (typically 20-25 tonnes per 40-foot container) are welcome.

**Q2: How long is your typical lead time?**
In-stock raw material, standard catalog: 15-20 working days. Standard catalog with new procurement: 25-35 working days. Custom machining per drawing: 30-45 working days. Special materials (e.g. F55 super duplex): 45-60 working days. Mill test certificate preparation: included; third-party inspection adds 3-7 days.

**Q3: What payment terms do you accept?**
T/T 30% deposit upon Proforma Invoice, 70% balance against copy of B/L. L/C at sight for orders above USD 50,000 (irrevocable, confirmed by a top-tier bank). O/A (open account) for repeat buyers with established credit history.

**Q4: Can you manufacture to my custom drawing?**
Yes. We accept PDF, DWG, STEP, IGES, and X_T formats. Lead time for custom is 30-45 working days after drawing approval. Quotation by RFQ.

**Q5: Do you provide Mill Test Certificate 3.1?**
Yes — included standard with every shipment at no extra charge. Issued by our quality department per EN 10204:2004 type 3.1, traceable to heat number, batch number, and the steel mill's chemical and mechanical test results. For 3.2 certificates (third-party witnessed), quote as a separate line on the Proforma Invoice.

**Q6: What are your packaging options?**
Standard packaging: plywood case with PE foam liner, ISPM 15 compliant (heat-treated, fumigation-free). Standard marking on outside: manufacturer, destination, dimensions, weight, ISIRI 9117 / PED / standard marking as applicable. Special packaging (vacuum-sealed + desiccant, VCI paper, custom crating) available on request at extra cost.

**Q7: How do you ship to [country]?**
We arrange FOB Tianjin / Shanghai / Qingdao (Incoterms 2020). CIF destination port (we book the vessel and insurance). DAP project site (door delivery, buyer handles import clearance). Sea freight transit times: 18-25 days to Bandar Abbas, 22-30 days to Hamburg / Rotterdam, 12-18 days to Singapore / Jakarta.

**Q8: Can you handle ISIRI 9117 Iran import documentation?**
Yes — we are an ISIRI 9117 authorised manufacturer. Dual-language marking (English + Persian numerals) on every flange body, IC issued by SGS Iran or TÜV Iran, and the MTC in English with Persian translation if required by Iranian customs. Bandar Abbas customs clearance typically 4 hours with complete documentation, 4-7 days if any document is missing.

**Q9: Do you hold PED 2014/68/EU Module H for CE marking?**
Yes — PED-2017-0042 issued by TÜV Rheinland Industrie Service GmbH, valid for CE marking of Category I-IV pressure equipment flanges. We include the CE marking on flanges for EU destinations at no extra cost (the PED fee is in our standard pricing).

**Q10: Are you NACE MR0175 / ISO 15156 compliant for sour service?**
Yes — material certificates indicate NACE compliance per ISO 15156-3:2020. For critical sour service, we provide additional hardness testing per NACE Annex A (typically HRC 22 max for carbon steel, HRC 32 for 316 stainless). Third-party NACE inspection available on request.

**Q11: What is the difference between your 6 flange types?**
Weld Neck (WN) — highest strength, butt-welded to pipe, for high-pressure/cyclic service. Slip-On (SO) — fillet-welded inside + outside, easier alignment, lower strength. Blind (BL) — solid disc, terminates piping or seals vessel. Socket-Weld (SW) — pipe in stepped socket bore, fillet-welded, for small-bore. Threaded (Th) — screw-on, no welding, for low-pressure utility. Plate (PL) — flat disc, lowest cost, for drainage/vent.

**Q12: Can you supply the full piping package (flanges + fittings)?**
Yes — we manufacture butt-weld pipe fittings (long-radius and short-radius elbows 45°/90°/180°, concentric and eccentric reducers, equal and reducing tees, caps, stub-ends) per ASME B16.9 / EN 10253 / GOST 17375. Material grades match our flange inventory (A105, A350 LF2, A182 F304/F316, F51/F55, 16MnDR).

**Q13: Do you have a USCC / business license copy I can verify?**
Yes — Unified Social Credit Code 91130900MA0XXXXXXXX (verified through NECIPS, the PRC State Administration for Market Regulation database). We provide a copy of the business licence on request under NDA or under a Proforma Invoice relationship. Our factory physical address: Building 5, Songdong Industrial Park, Cangzhou, Hebei 061000, PRC.

**Q14: What is your annual capacity and current lead time backlog?**
Annual forging capacity: 10,000 tonnes across two workshops. Current backlog: typically 3-6 weeks. New orders with raw material in stock: 15-20 working days. Standard catalog with new procurement: 25-35 working days. Rush orders (10-15 days) accepted at 15-25% expedite premium, subject to raw material availability.

**Q15: How do I get started with a quotation?**
Three options: (1) submit the web form at https://hbyagada.com/#rfq (recommended — gets a structured reply within 24 hours); (2) WhatsApp +86 186 3177 4440 (fastest for urgent); (3) email mafuze@hebeiyagada.com. Include: standard (ASME / EN / JIS / GOST / ISIRI), type (WN/SO/BL/SW/Th/PL), class or PN rating, NPS or DN size, material grade, quantity, destination port. Attach drawings if custom.