ZHEJIANG JIAJI FORGING INDUSTRY CO., LTD. is a professional manufacturer of industrial forged flanges and pipe fittings, supplying petroleum, chemical, marine, and power engineering projects worldwide.
DN15–DN2000, 150LB–3000LB. ASME / DIN / EN / GB standards. Stainless steel, duplex, and nickel alloys for oil, gas, petrochemical, and marine applications.
11 types across 3 standard systems: ASME (B16.5/B16.47), EN1092-1, and GB/T. DN15–DN2000, PN0.6–42MPa.
9 types: Socket Weld (B16.11), Threaded (NPT), and Butt Weld Olets (MSS-SP-97). 1/2"–24", Class 2000–9000LB.
60+ grades: Austenitic SS, Duplex & Super Duplex, Nickel-based alloys. Full mill test certificates with every order.
High-demand items for Caspian & Central Asian markets — GOST 33259 and EN 1092-1 compatible
Pre-welded nipple + flange assembly. Eliminates field fit-up and welding. Available in ASTM A182 F316/F304. EN 1092-1 Type 02/11 compatible.
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Socket Weld branch connection fitting per MSS-SP-97. 1/2"–4" Class 3000/6000LB. ASTM A182 F316L/F304L. Ideal for small-bore high-pressure oil & gas piping.
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Weld neck and other types in S31803/2205 and S32750/2507. 40% stronger than austenitic, superior chloride corrosion resistance. Preferred for Caspian Sea offshore projects.
View Specifications ->Since 2010, we have earned trust from buyers in 30+ countries through consistent quality, professional service, and competitive pricing.
11 flange types + 9 fitting types covering DN15-DN2000, pressure up to 3000LB. One-stop sourcing for industrial fluid connection systems.
Austenitic stainless (304/316L), duplex (2205/2507), nickel alloys (Hastelloy/Inconel/Monel). 60+ material grades with full mill test certificates.
ISO 9001 (TUV SUD) + PED-AD2000 certified. Every shipment includes dual inspection reports and material traceability documentation.
Dedicated English-speaking export team based in Shanghai. 7x24h global response. Fluent communication, fast RFQ, reliable order follow-up.
We supply austenitic stainless steel, duplex and super duplex stainless steel, and nickel-based alloys for the most demanding corrosive environments.
304/304L, 316L/316Ti, 321/321H, 317L, 347H, 310S, 904L. The most widely used stainless steel for general corrosion resistance.
S31803/2205, S32750/2507, S31254/F44, S32760/F55. Twice the strength of austenitic with excellent chloride stress corrosion resistance.
Hastelloy C276, Inconel 625/825, Monel 400, Incoloy 800/825, and more. Engineered for extreme heat and corrosive environments.
Every product is backed by internationally recognized certifications and rigorous quality control from raw material to shipment.
Quality Management System - TUV SUD NB0036 Certified
EU Pressure Equipment Directive - EN AD2000-Merkblatt
Full Material Traceability - Every Heat/Lot Covered
Every Shipment Double-Checked Before Dispatch
We stand behind every product with a 24-month quality warranty. Should any quality issue arise, we will provide replacement or full refund in accordance with our warranty policy. All claims are handled promptly through our Shanghai export team.
From raw material sourcing to final shipment, every step is monitored, tested, and documented.
Incoming material inspection with PMI / spectroscopy testing. Heat numbers and mill certificates recorded for full traceability.
Precision die forging under controlled temperature. Optimal grain structure ensures superior mechanical strength.
Every batch undergoes solution annealing in controlled furnace atmosphere to achieve optimal corrosion resistance and microstructure.
CNC turning, milling, and drilling to meet dimensional tolerances per ASME B16.5 / EN1092-1. Ultrasonic testing (UT) available on request.
Visual, dimensional, and pressure tests. Each product marked with material grade, heat number, and pressure rating.
Sea-worthy packaging with rust prevention. Plywood cases or pallets. Documentation: PL, CI, BL, Mill Cert, Inspection Report.
JIAJI flanges and fittings are specified by engineering companies and procurement teams across four major industries worldwide.
Upstream, midstream, and downstream. Offshore platforms, FPSO vessels, refineries, and pipeline stations. High-pressure wellhead and pipeline applications.
Corrosive media handling, chlor-alkali plants, acid storage, and chemical processing. Nickel alloy and duplex stainless flanges for aggressive environments.
Seawater cooling systems, ballast water management, FPSO vessels, and desalination plants. Super duplex 2507 and super austenitic 904L preferred.
Thermal and nuclear power plants. High-temperature steam piping, boiler systems, and heat exchangers. Inconel and chrome-moly solutions.
Quick answers to common questions from international buyers about our flanges and fittings.
Send us your requirements - drawing, standard, material, quantity, and destination port. Our Shanghai export team will respond within 4 hours with a detailed quotation.
