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China ASTM A403 B16.9 Butt-Welded Fittings - Quality Products from Leading Suppliers and Factory
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 |
Frequently Asked Questions (FAQ)
What is the difference between ASTM A403 and ASME B16.9?
ASTM A403 is the material specification that defines the chemical composition and mechanical properties of wrought austenitic stainless steel fittings. ASME B16.9, on the other hand, defines the physical dimensions, tolerances, and ratings for factory-made wrought butt-welding fittings.
Which stainless steel grades are available under ASTM A403?
Standard grades include WP304, WP304L, WP316, WP316L, WP321, WP316Ti, and WP310S. The specific grade chosen depends on the required corrosion resistance, temperature limits, and application environment.
What types of pipe fittings are covered under these standards?
These standards cover a wide range of butt-welding fittings, including long and short radius elbows, equal and reducing tees, concentric and eccentric reducers, crosses, end caps, and lap joint stub ends.
Are ASTM A403 B16.9 fittings suitable for high-pressure systems?
Yes. These fittings are solution-annealed and manufactured to withstand high-pressure and high-temperature services, making them ideal for petrochemical, chemical processing, and power generation piping systems.
What quality tests do these fittings undergo?
The fittings undergo 100% PMI (Positive Material Identification) testing to verify chemical grades. They are supplied with En10204.3.1b Mill Test Certificates, and third-party inspections are fully accepted.