ASTM A479 TP431 Round Bar Stock List
Nov 18, 2025
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If you are looking for ASTM A479 TP431 stainless steel round bars, GNEE offers a wide range of high-quality TP431 round bar stock in various sizes, diameters, and finishes. Our products meet ASTM A479, ASME SA479, EN 10088, and other international standards, and come with mill test certificates (EN 10204 3.1/3.2) to ensure reliable quality and traceability. We supply fast delivery, competitive pricing, and customized solutions for engineering, chemical, and industrial applications.
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ASTM A479 TP431 Round Bar Specification
| Property | Specification |
|---|---|
| Material Grade | TP431 (ASTM A479 / ASME SA479) |
| Chemical Composition | C: 0.15–0.20%, Cr: 16.0–18.0%, Ni: 3.0–5.0%, Mn: ≤1.0%, Si: ≤1.0%, P: ≤0.03%, S: ≤0.03%, Fe balance |
| Type | Austenitic/Ferritic Stainless Steel |
| Diameter Range | 6mm – 150mm (custom sizes available) |
| Length | 1000mm – 6000mm (custom lengths available) |
| Surface Finish | Hot Rolled, Cold Rolled, Pickled & Oiled, Bright Finish |
| Tensile Strength | 650–850 MPa |
| Yield Strength | 275–450 MPa |
| Elongation | 25–40% |
| Hardness (HB) | 180–220 HB |
| Density | 7.75–7.85 g/cm³ |
| Heat Resistance | Up to 600°C continuous service |
ASTM A479 TP431 Round Bar Applications
Chemical Processing Equipment: Heat exchangers, reactors, and piping components.
Marine & Offshore: Propeller shafts, pumps, and saltwater-exposed components.
Aerospace & Power: Turbine components and boiler tubes.
Industrial Machinery: Shafts, pins, fasteners, and high-strength wear parts.
Food & Beverage: Processing machinery and sanitary fittings (non-corrosive environments).
What is the difference between TP431 and 304 stainless steel?
The main difference is that TP431 is a heat-treatable, magnetic, martensitic stainless steel, while 304 is a non-magnetic, austenitic stainless steel that is not heat-treatable. 304 is known for its superior corrosion resistance due to its nickel content, while 431 uses a heat treatment process to achieve high strength and hardness, making it suitable for different applications like mechanical parts that require high tensile strength.
GNEE supplies ASTM A479 TP431 stainless steel round bars with the following features:
Material Grades: TP431, TP304, TP316, TP321, TP410, and more.
Diameter Range: 6 mm to 200 mm, customizable for specific applications.
Lengths: Standard lengths 1,000 mm to 6,000 mm; cut-to-length services available.
Surface Finishes: Bright polished, pickled, sandblasted, or custom finishes.
Forms: Round bars, forged bars, cold-drawn, and annealed options.
Certifications: ISO 9001, SGS, BV, and material test certificates (MTC) according to ASTM standards.
GNEE ensures that every round bar meets ASTM A479 TP431 standards, guaranteeing excellent mechanical performance and corrosion resistance.
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