ASTM A403 B16.9 Butt-Welded Fittings
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: All Fittings are marked as follows:Specifications,Standard,Grade,Heat NO. (or as per customers’ 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 |