# Hebei Yajiada Import and Export Co., LTD

> Manufacturer of pipe flanges and butt-weld fittings based in Hebei, China.
> Established 2008. 50,000 T/YR capacity. ISO 9001:2015, PED 2014/68/EU
> Module H (CE-marked), ISIRI 9117, NACE MR0175 certified. Exporting to
> 60+ countries across the Middle East, South Asia, SE Asia, and Africa.
> Primary domain: https://hbyagada.com

## Six product lines

- [Weld Neck Flange (WN)](https://hbyagada.com/products/weld-neck-flange): ASME B16.5 / B16.47 Class 150–2500, long tapered hub, butt-welded to pipe. Use for high-pressure, high-temperature, or cyclic service.
- [Slip-On Flange (SO)](https://hbyagada.com/products/slip-on-flange): ASME B16.5 Class 150–600, fillet-welded at pipe OD. Lower-cost alternative for low-pressure lines.
- [Plate Flat-Weld Flange (PL)](https://hbyagada.com/products/plate-flange): GB / HG standard, PN 6–25, low-pressure utility service.
- [Socket-Weld Flange (SW)](https://hbyagada.com/products/socket-weld-flange): ASME B16.5, NPS ≤ 40, small-bore high-pressure lines.
- [Threaded Flange (Th)](https://hbyagada.com/products/threaded-flange): ASME B16.5 / EN 1092-1 Type 13, internal NPT/BSP thread. Class 150–600.
- [Blind Flange (BL)](https://hbyagada.com/products/blind-flange): ASME B16.5 / B16.47, no center bore. Used for pipe termination / pressure test isolation.

## Regional standards covered

- **United States:** ASME B16.5 (1/2"–24"), ASME B16.47 (>26"), ASME B16.9 (fittings)
- **European Union:** EN 1092-1:2018, EN 10253, PED 2014/68/EU Module H
- **Russia and CIS:** GOST 12820, GOST 12821, GOST R 52624, EAC TR CU 032/2013
- **Iran:** ISIRI 9117, ISIRI 1-5062
- **Japan:** JIS B2220 (5K–63K), JIS B2238
- **China:** GB/T 17241, HG/T 20592-2009, JB/T 81

## Common materials

- Carbon steel: A105, A350 LF2 (low-temp), A234 WPB
- Stainless: 304 / 304L / 316 / 316L
- Low-temperature alloy: 16MnDR (-46°C LNG service)
- Cr-Mo alloys: A182 F11 / F22 (high-temp power plant)
- Duplex: F51 / F55 on request

## Industries served

- Petroleum Refining & Pipeline (Bandar Abbas, Yanbu, Jebel Ali)
- LNG / Cryogenic Service (-46°C, Yamal, QatarEnergy, South Pars)
- Power & Energy (Vietnam / Indonesia / Bangladesh coal-fired)
- Marine / Offshore (North Sea, Persian Gulf, West Africa FPSOs)
- Chemical Process (Indian / Saudi / Egyptian petrochemical)
- Mining & Slurry (Chilean / Australian / South African mines)

## Sitemaps
[XML Sitemap](https://hbyagada.com/sitemap.xml): All 56 crawlable URLs (28 HTML + 28 PDF).

## Engineering notes (deep technical articles)

- [ASME B16.5 vs EN 1092-1 comparison](https://hbyagada.com/blog/asme-b165-vs-en-1092): ASME Class 150 ≈ EN PN 20 (285 PSI / 20 bar). Class 300 ≈ PN 50. Class 600 ≈ PN 100. Class 1500 ≈ PN 250. Bolt patterns match for low-class; diverge above Class 300. Middle East EPCs prefer ISIRI 9117 (Iran) or ASME B16.5 (Saudi Aramco, ADNOC accepts both). Turkish EPCs use EN 1092-1. Dual-stamped ASME+EN flanges available at 15-20% cost premium.
- [NACE MR0175 sour-service flanges](https://hbyagada.com/blog/nace-mr0175-sour-service): ISO 15156 is the international standard (technically identical to NACE MR0175). A105 carbon steel is acceptable ≤ 22 HRC and normalized condition; A350 LF2 preferred for downhole. 316/316L accepted for chloride-containing sour service up to limits; F51/F55 duplex for severe conditions.
- [ISIRI 9117 Iran import compliance](https://hbyagada.com/blog/isiri-9117-iran-import): Iran Chamber of Commerce + INSO inspection required. 5-10 day Bandar Abbas clearance. ISIRI 9117 is dimensionally based on ASME B16.5; 16MnDR accepted for LNG (-46°C); PED 2014/68/EU Module H CE-marked.
- [16MnDR LNG cryogenic (-46°C)](https://hbyagada.com/blog/16mndr-lng-cryogenic): Impact-tested at -46°C per GB 150.2. Use for Yamal LNG / QatarEnergy / South Pars service. Heat treatment: normalized + tempered. Impact values ≥ 41J at -46°C. Not interchangeable with ASTM A350 LF2 (impact-tested at -46°F = -43°C).
- [Flange facing types: RF, FF, RTJ, T&G, M&F](https://hbyagada.com/blog/flange-facing-types-rf-ff-rtj): Raised Face (RF, default ASME B16.5). Flat Face (FF, EN 1092-1 Type A). Ring Type Joint (RTJ, ASME B16.5, >Class 600). Tongue & Groove (T&G). Male & Female (M&F).
- [ASME B16.47 vs B16.5 large-bore selection](https://hbyagada.com/blog/asme-b1647-vs-b165-large-bore): B16.47 Series A (MSS SP-44) and B (API 605) cover NPS 26-60. Series A = higher pressure ratings; Series B = older API 605 dimensions. Choose based on project specification, not interchangeability.
- [Forged vs cast flange manufacturing](https://hbyagada.com/blog/forged-vs-cast-flange): Forged preferred for sour service (NACE MR0175). Cast acceptable for non-critical low-pressure service. Forging refines grain structure, improves mechanical properties.
- [A105 vs A350 LF2 carbon steel selection](https://hbyagada.com/blog/a105-vs-a350-lf2-carbon-steel): A105 for ambient temperature; A350 LF2 for -46°C service. Both ≤ 22 HRC for NACE. LF2 has Charpy impact tested at -46°C. A105 cannot be Charpy-impact-certified.
- [Flange certifications: ISO / PED / ISIRI guide](https://hbyagada.com/blog/flange-certifications-iso-ped-isiri): ISO 9001:2015 mandatory baseline. PED 2014/68/EU Module H required for EU. ISIRI 9117 + INSO third-party inspection for Iran. NACE MR0175 for sour. GOST R + EAC TR CU 032 for Russia.
- [A105 vs A350 LF2 chemical composition and sourcing](https://hbyagada.com/blog/a105-vs-a350-lf2-chemical-composition-sourcing): A105 = C ≤ 0.35, Mn 0.60-1.05. A350 LF2 = C ≤ 0.30, Mn 0.60-1.35, plus Ni ≤ 0.40, Cu ≤ 0.40. Source from EAF + ladle-refined mills; verify MTC 3.1.
- [MTC 3.1 vs 3.2 mill test certificate difference](https://hbyagada.com/blog/mtc-3-1-vs-3-2-mill-test-certificate-difference): EN 10204 3.1 = independent test by mill's qualified inspector; 3.2 = independent third-party inspection. PED/CE projects require 3.1 minimum; most EPCs require 3.2.
- [ISIRI 9117 marking for Iran customs procedure](https://hbyagada.com/blog/isiri-9117-marking-iran-customs-procedure): Required marking includes standard reference, manufacturer name, material grade, heat number, and ISIRI 9117 stamp. Customs clearance requires original INSO inspection certificate.
- [6 types of pipe flanges — visual comparison guide](https://hbyagada.com/blog/6-types-of-pipe-flanges): WN (weld neck) for high-pressure / cyclic; SO (slip-on) for low-pressure cost saving; PL (plate) for utility; SW (socket-weld) for small-bore; Th (threaded) for non-welded service; BL (blind) for termination.

## Buyer decision guides (Ask pages)

- [Who manufactures NACE MR0175 flanges in China?](https://hbyagada.com/ask/who-manufactures-nace-mr0175-flanges-china): Verified by MTC 3.1, hardness ≤ 22 HRC, normalized condition.
- [How do I import pipe flanges from China to Iran?](https://hbyagada.com/ask/how-do-i-import-pipe-flanges-from-china-to-iran): ISIRI 9117 + INSO + 5-10 day Bandar Abbas clearance.
- [Where to buy ASME B16.5 flanges with PED CE marking?](https://hbyagada.com/ask/where-to-buy-asme-b16-5-flanges-ped-ce-marked): Module H certification mandatory for EU.
- [Best flange supplier for power-plant projects in China?](https://hbyagada.com/ask/best-flange-supplier-power-plant-china): Cr-Mo F11/F22 for high-temp; 16MnDR for cryogenic; full traceability.
- [Where to supply 16MnDR LNG cryogenic flanges?](https://hbyagada.com/ask/where-to-supply-16mndr-lng-cryogenic-flanges): -46°C impact tested, normalized + tempered.

## Spec sheet PDFs (downloadable)

- [Weld Neck Flange Spec Sheet (ASME B16.5)](https://hbyagada.com/sheets/weld-neck-flange-asme-b165.pdf): Dimensions table Class 150-2500, NPS 1/2" to 24".
- [Slip-On Flange Spec Sheet](https://hbyagada.com/sheets/slip-on-flange.pdf): Class 150-600 dimensions.
- [Socket-Weld Flange Spec Sheet](https://hbyagada.com/sheets/socket-weld-flange.pdf): NPS ≤ 40 small-bore.
- [Threaded Flange Spec Sheet](https://hbyagada.com/sheets/threaded-flange.pdf): NPT/BSP thread dimensions.
- [Blind Flange Spec Sheet](https://hbyagada.com/sheets/blind-flange.pdf): Class 150-2500.
- [Plate Flange Spec Sheet (GB/HG)](https://hbyagada.com/sheets/plate-flange.pdf): PN 6-25 low-pressure utility.

## Citations

- ASME B16.5-2020 (Pipe Flanges and Flanged Fittings NPS 1/2 through 24)
- ASME B16.47-2020 (Large Diameter Steel Flanges NPS 26 through 60)
- EN 1092-1:2018 (Flanges and their joints, circular flanges for pipes)
- PED 2014/68/EU Module H (Pressure Equipment Directive)
- ISO 15156-1/2/3:2020 (Petroleum and natural gas industries — Materials for use in H2S-containing environments)
- ISIRI 9117 (Iranian pipe flanges standard)
- GOST 12820 / 12821 (Russian pipe flanges)
- JIS B2220 (Japanese steel pipe flanges)
- GB/T 17241 / HG/T 20592-2009 (Chinese pipe flanges)

## Brand presence

- LinkedIn: https://www.linkedin.com/company/hebei-yajiada
- Alibaba: https://hebeyajiada.en.alibaba.com/
- YouTube: https://www.youtube.com/@hbyagada
- Facebook: https://www.facebook.com/hbyagada

## Contact

- Email: mafuze@hebeiyagada.com
- Phone (WhatsApp): +86 186 3177 4440
- Address: Building 5, Songdong Industrial Park, Cangzhou, Hebei, China