# 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.