Stainless steel weld flanges is critical components in industrial piping systems, widely used in oil & gas, petrochemicals, power generation, offshore engineering, pharmaceuticals, and food processing industries. Manufactured through forging, machining, and heat treatment processes, these flanges offer excellent corrosion resistance, high-temperature strength, and reliable sealing performance, ensuring safe and stable operation of piping systems.
Key Features
Standards:
International Standards:
ASME B16.5 (Pipe Flanges and Flanged Fittings)
ASME B16.47 (Large Diameter Steel Flanges)
MSS SP-44 (Steel Pipeline Flanges)
EN 1092-1 (European Flange Standard)
Domestic Standards:
GB/T 9112–9128 (Steel Pipe Flanges)
HG/T 20592–20635 (Chemical Industry Flange Standards)
Special Application Standards:
API 6A (Wellhead Equipment)
ISO 15156 (NACE MR0175, Sulfide Stress Corrosion Cracking Resistance)
Materials:
Stainless Steel Flanges: 304/304L, 316/316L, 321, 347, 310S, 904L, Duplex Steels (2205, 2507)
Nickel-Based Alloy Flanges: Inconel® 625, Inconel® 825, Hastelloy® C276, Monel® 400, Incoloy® 800H
All materials meet ASTM/ASME or EN chemical and mechanical requirements.
Dimensions:
Nominal Diameter (DN): DN15 (1/2") to DN2000 (80")
Pressure Classes: Class 150, 300, 600, 900, 1500, 2500 (ASME)
Connection Types: Weld Neck (WN), Slip-On (SO), Socket Weld (SW), Threaded (TH), Lap Joint (LJ)
Face Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male-Female (MF), Tongue & Groove (TG)
Applications:
Stainless Steel Flanges: Suitable for moderate corrosive environments such as water treatment, food processing, general chemical processes.
Nickel-Based Alloy Flanges: Used in extreme corrosive environments with strong acids, alkalis, high temperature/pressure, chlorides, or sulfides, such as:
Offshore platform seawater systems
Petrochemical hydroprocessing units
Nuclear power cooling systems
Flue Gas Desulfurization (FGD) systems
Certifications & Approvals:
Classification Society Certifications:
ABS, DNV, LR, BV, NK, CCS,NORSOK M650
Provide Type Approval Certificates and Mill Test Certificates + Third-Party Inspection Reports per batch
Owner & Engineering Company Approvals:
ISO 9001 Quality Management System
API 6A Certification (for oil & gas wellhead equipment)
NACE MR0175 / ISO 15156 (SSC resistance)
PED 2014/68/EU (Pressure Equipment Directive)
AD 2000-Merkblatt (German pressure vessel code)
Approved by Sinopec, CNOOC, Shell, ExxonMobil, BP, etc.
Common Customer Questions (Q&A Format)
Q: What is the main difference between stainless steel and nickel-based alloy flanges?
A: Stainless steel flanges are cost-effective for general corrosion; nickel alloys offer superior corrosion and high-temperature resistance for extreme conditions, at higher cost.
Q: How to select the right flange material?
A: Choose based on medium (acid/alkali, chloride content), temperature, pressure, and environment. For example:
Seawater systems: Duplex 2205 or Hastelloy C276;
High-temp sour service: Inconel 625.
Q: Do you support non-standard flange designs?
A: Yes, custom designs based on customer drawings or ASME B16.5/EN 1092-1, with FEA analysis support.
Q: What are the delivery conditions?
A: Typically solution annealed + pickled or sandblasted, with clean, oxide-free surfaces.
Q: Are NDT reports available?
A: Yes, UT, MT, PT, and RT reports available upon request.
Q: How are flange sealing surfaces protected during shipping?
A: RF faces with plastic guards, RTJ faces secured in wooden crates, overall packed in moisture-proof film + steel frame.
Q: Do your flanges comply with NACE MR0175?
A: Yes, for H₂S environments, we provide materials and heat treatment per NACE MR0175/ISO 15156, with third-party test reports.
Q: What is the lead time?
A: Standard products: 15–30 days; non-standard or large-diameter: 45–90 days, depending on material and quantity.
Q: How is dimensional accuracy ensured?
A: CNC machining with tolerances within ±0.1mm, supported by CMM reports.
Q: Is material traceability provided?
A: Yes, each batch includes a Material Test Certificate (MTC 3.1 or 3.2) with heat number, chemical composition, mechanical properties, and heat treatment records for full lifecycle traceability.
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