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China ASTM A403 B16.9 Butt-Welded Fittings Suppliers | 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
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 |
Frequently Asked Questions
What is the difference between ASTM A403 and ASME B16.9?
ASTM A403 is the material standard that specifies the chemical and mechanical properties of wrought austenitic stainless steel pipe fittings. ASME B16.9 is the dimensional standard regulating the overall dimensions, tolerances, and configurations of factory-made wrought butt-welding fittings.
Which stainless steel grades are covered under ASTM A403?
Common grades include WP304, WP304L, WP316L, WP321, WP316Ti, and WP310S. These grades offer varying levels of corrosion resistance, heat tolerance, and structural strength depending on the chemical composition.
What types of pipe fittings are available under these standards?
Available fittings include Long/Short Radius Elbows, Equal/Reducing Tees, Crosses, Concentric/Eccentric Reducers, End Caps, and Stub Ends. They are produced in both seamless and welded options.
What inspection processes do these fittings undergo?
ASTM A403 fittings undergo 100% PMI (Positive Material Identification) testing. They are supplied with an En10204.3.1b Mill Test Certificate to guarantee chemical and mechanical compliance, and third-party inspections are accepted.
What standard sizes and schedules are supported?
Fittings are available in sizes ranging from 1/2" to 48" in nominal pipe size (NPS), with wall thickness schedules ranging from Sch5s up to Extra Heavy (XXH).