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China ASTM A403 B16.9 Butt-Welded Fittings Suppliers - Quality Products from Certified Factories
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
• 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 a material standard that specifies the chemical and mechanical properties of wrought austenitic stainless steel fittings. ASME B16.9 is a dimensional standard specifying sizes, tolerances, and dimensions for factory-made wrought butt-welding fittings.
What types of pipe fittings are covered under the ASTM A403 B16.9 standard?
This standard covers both seamless and welded fittings, including Elbows, Equal Tees, Cross, Reducers, End caps, and Stub ends, ranging in sizes from 1/2" to 48" with Sch5s to XXH wall thicknesses.
What stainless steel grades are typically available for ASTM A403 fittings?
Common grades include WP304, WP304L, WP316L, WP321, WP316Ti, WP310S, and WPB. These grades offer different chemical compositions and mechanical properties suited for various high-temperature or corrosive services.
What are the mechanical properties of WP304 and WP316 fittings?
Both WP304 and WP316 grades feature a typical tensile strength of ≥515 MPa and a yield strength of ≥205 MPa, providing strong structural integrity under pressure.
What quality inspections and certifications are provided for these fittings?
Fittings undergo 100% PMI testing and are supplied with an En10204.3.1b Mill Test Certificate. Additionally, third-party inspections are accepted to guarantee quality compliance.
How are ASTM A403 B16.9 fittings marked and packaged?
All fittings are marked with their specifications, standard, grade, and heat number (or as per customer requirements). They are packed in plywood cases or fumigated wooden cases to protect them during transit.