Which Chinese flange manufacturers are NACE MR0175 certified for sour service?

NACE MR0175 compliance limits carbon steel hardness to 22 HRC maximum for sour H₂S service — a specification that disqualifies many Chinese flange manufacturers who do not perform post-weld heat treatment. This page lists the materials and processes we use to maintain NACE MR0175 qualification.

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Browse related products

• Weld Neck Flange (WN) · ASME B16.5
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Get in Touch · Hebei Yajiada Flange Manufacturer

Quick contact options for sourcing pipe flanges (ASME B16.5 / EN 1092-1 / JIS B2220 / BS 4504 / HG/T 20592) with full material traceability and shipping to 60+ countries.

Primary Contact Channels

• WhatsApp: +86 186 3177 4440 — Export team. Acknowledgement within 2 hours, full quote within 12 hours. Mon–Sat 8am–8pm CST.
• Email: mafuze@hbyagada.com — Engineering team responds within 48 hours for technical specs and drawings.
• Phone: +86 186 3177 4440 — Direct line to Export Department.
• Online RFQ: Structured RFQ form — 4-hour structured quotation including FOB price, lead time, payment terms, and shipping schedule.

Industry-Specific Quote Shortcuts

• Petroleum Refining & Pipeline
• LNG / Cryogenic Service
• Power & Energy (540°C+)
• Marine / Offshore (F51/F55 duplex)
• Chemical Process
• Mining & Slurry

Trust Signals at Decision Point

• 18 years in flange manufacturing (since 2008) · 50,000 T/YR capacity
• ISO 9001 quality management system (cert. ref. on file)
• PED 2014/68/EU Module H ([PED ref. on file], TÜV Rheinland) since 2017
• NACE MR0175 / ISO 15156 qualified for sour service
• EN 10204 3.1 MTC included with every order
• 60+ countries exported · 24-hour quotation · 30-45 day lead time