Stainless Steel & Nickel-Based Alloy Pipe Fittings
Stainless steel fitting and alloy pipe fittings are critical components in industrial piping systems, widely used in oil & gas, petrochemicals, offshore engineering, power generation, pharmaceuticals, and food processing industries. The product range includes elbows, tees, reducers, caps, and unions, manufactured from high-quality stainless steel or high-performance nickel alloys through precision forging, hot extrusion, cold forming, and solution annealing processes. These fittings offer exceptional corrosion resistance, high-temperature strength, and sealing reliability, ensuring safe operation of piping systems under severe service conditions.
Key Features
Standards:
International Standards:
ASME B16.9 (Factory-Made Wrought Steel Buttwelding Fittings)
ASME B16.11 (Forged Steel Socket-Welding and Threaded Fittings)
MSS SP-75 (High-Strength Forged Fittings)
ASTM A403 (Wrought Austenitic Stainless Steel Piping Fittings)
ASTM B366 (Wrought Nickel-Alloy Fittings)
European Standards:
EN 10253 (Butt-Welding Fittings)
EN 10241 (Threaded Fittings)
Chinese Standards:
GB/T 12459 (Seamless Steel Butt-Welding Fittings)
GB/T 13401 (Welded Steel Butt-Welding Fittings)
GB/T 14383 (Forged Steel Fittings)
HG/T 21631 (Socket-Welded Steel Fittings)
Materials:
Stainless Steel Fittings:
304/304L, 316/316L, 321, 347, 310S, 904L
Duplex Steels: 2205 (UNS S31803), 2507 (UNS S32750)
Super Austenitics: 254SMO (UNS S32154), AL-6XN (N08367)
Nickel-Based Alloy Fittings:
Inconel® 625 (UNS N06625), Inconel® 825 (N08825)
Hastelloy® C276 (N10276), Monel® 400 (N04400)
Incoloy® 800H (N08810), Inconel® 718 (N07718)
All materials meet chemical and mechanical requirements per ASTM/ASME or EN standards.
Dimensions:
Nominal Diameter (DN): DN15 (1/2") to DN1200 (48")
Wall Thickness: SCH5S, SCH10S, SCH40S, SCH80S (stainless); STD, XS, XXS
Types & Angles:
Elbows: 90°, 45°, 180° (Long Radius LR, Short Radius SR)
Tees: Equal Tee, Reducing Tee
Reducers: Concentric, Eccentric
Connection Types: Butt-Weld, Socket Weld, Threaded
Applications:
Stainless Steel Fittings: Suitable for moderate corrosive environments, such as:
Food & beverage pipelines
Pharmaceutical clean systems (316L EP electropolished)
Chemical process lines
Seawater desalination pretreatment
Nickel-Based Alloy Fittings: Used in extreme corrosion, high temperature/pressure environments, such as:
Offshore platform seawater injection (Inconel 625)
Petrochemical hydrocracking units (Hastelloy C276)
Nuclear primary loop cooling (Inconel 690)
Flue Gas Desulfurization (FGD) and pickling systems (Alloy 20)
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 5L (for line pipe fittings)
NACE MR0175 / ISO 15156 (Sulfide Stress Corrosion Cracking Resistance)
PED 2014/68/EU (Pressure Equipment Directive)
AD 2000-Merkblatt (German pressure vessel code)
Approved by Sinopec, CNOOC, Shell, ExxonMobil, BP, Total,ADNOC,KOC,PETROBRAS,etc.
Common Customer Questions (Q&A Format)
Q: What is the main difference between stainless steel and nickel-based alloy fittings?
A: Stainless steel fittings 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 fitting material?
A: Choose based on medium (pH, chloride content), temperature, pressure, and environment. For example:
Seawater systems: 2205 or Inconel 625;
Hydrofluoric acid service: Hastelloy C276.
Q: Do you support non-standard fitting designs?
A: Yes, custom designs based on customer drawings or ASME B16.9/EN 10253, with FEA analysis support.
Q: What are the delivery conditions?
A: Typically solution annealed + pickled or sandblasted, with clean surfaces; 316L EP grade available with electropolishing.
Q: Are NDT reports available?
A: Yes, UT, MT, PT, and RT reports available upon request, especially for Class 600+ or critical applications.
Q: How to protect fitting ends during shipping?
A: Butt-weld ends with plastic guards, large-diameter fittings secured in wooden crates or steel frames, overall moisture-proof and impact-resistant packaging.
Q: Do your fittings 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 forming and machining with tolerances within ±0.5mm, 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, chemistry, mechanical properties, and heat treatment records for full lifecycle traceability.
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