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Products
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SS SMLS PIPE
- SS SMLS PIPE 2507 ASTM A790
- SS SMLS PIPE 2205 ASTM A790
- SS SMLS PIPE S31803 ASTM A790
- SS SMLS PIPE 904L ASTM A240
- SS SMLS PIPE TP321 ASTM A312
- SS SMLS PIPE TP310S ASTM A312
- SS SMLS PIPE TP316Ti ASTM A312
- SS SMLS PIPE TP316L ASTM A312
- SS SMLS PIPE TP316 ASTM A312
- SS SMLS PIPE TP304L ASTM A312
- SS SMLS PIPE TP304 ASTM A312
China Suppliers of ASTM A403 B16.9 Butt-Welded Fittings - Quality Factory Exporter
Introduction
ASTM A403 is a standard specification for wrought austenitic stainless steel pipe fittings, while ASME B16.9 defines the dimensions and tolerances for factory-made wrought butt-welding fittings. Together, "ASTM A403 B16.9" refers to stainless steel fittings (e.g., elbows, tees, reducers) that meet both material and dimensional requirements. These fittings are designed for high-pressure, high-temperature, and corrosive service in piping systems.
Key Features
Corrosion Resistance
Excellent resistance to oxidizing acids, chlorides (316/316L), and high-temperature scaling.
Heat Treatment
Solution-annealed for optimal corrosion resistance and ductility.
Dimensional Precision
Complies with ASME B16.9 for seamless integration into piping systems.
Product Specification
Standard
ASTM A403, ASME B16.9, ASME B16.28, ASTM A234, EN 10253
Type
Seamless and Welded
Products Name
Elbows, Equal Tees, Cross, Reducers, End caps, Stub ends, etc.
Grade
WP304, WP304L, WP316L, WP321, WP316Ti, WP310S, WPB, etc.
Sizes
From 1/2" to 48", Sch5s - XXH
Surface
Annealed, Sandblasted
Inspection
100% PMI Tested, EN10204 3.1b Mill Test Certificate, Third Party Inspection Accepted
Marking
Specifications, Standard, Grade, Heat No. (or as per customer's requirement)
Packing
Plywood cases or fumigated wooden case as per customer's requirement
A403 B16.9 Material Properties
| Grade | Chemical Composition (Typical %) | Mechanical Properties |
|---|---|---|
| WP304 | Cr: 18–20, Ni: 8–11, C: ≤0.08 | Tensile: ≥515 MPa, Yield: ≥205 MPa |
| WP316 | Cr: 16–18, Ni: 10–14, Mo: 2–3 | Tensile: ≥515 MPa, Yield: ≥205 MPa |
| WP321 | Ti: 5×C min (stabilized against sensitization) | Tensile: ≥515 MPa |
Frequently Asked Questions
What is the difference between ASTM A403 and ASME B16.9?
ASTM A403 is the material standard that specifies the chemical composition, mechanical properties, and heat treatment of wrought austenitic stainless steel pipe fittings. ASME B16.9 is the dimensional standard that defines the physical dimensions, tolerances, and configurations of factory-made butt-welding fittings.
What types of fittings are covered under ASTM A403 B16.9?
This standard covers a wide range of butt-welding fittings, including elbows (long and short radius), equal and reducing tees, crosses, concentric and eccentric reducers, end caps, and stub ends.
Can these fittings be used in high-temperature environments?
Yes, ASTM A403 stainless steel fittings (such as WP304, WP316, and WP321) are solution-annealed and designed to maintain mechanical strength and resist scaling in high-temperature and high-pressure services.
What is the difference between seamless and welded ASTM A403 fittings?
Seamless fittings are made from seamless pipes and are ideal for critical high-pressure applications. Welded fittings are manufactured from plates or welded pipes and are commonly used in larger sizes or lower-pressure systems, often offering a more cost-effective solution.
What quality inspections are performed on these fittings?
Fittings undergo rigorous quality checks, including 100% PMI (Positive Material Identification) testing. They are delivered with an EN10204 3.1b Mill Test Certificate, and third-party inspections (such as SGS or BV) are accepted.