SUS431 – Nickel-Enhanced Martensitic Alloy For High-Strength Corrosive Environments

Overview

SUS431 is a nickel-enhanced martensitic stainless steel specified by JIS G 4303, containing 1.50-2.50% nickel to significantly improve corrosion resistance and toughness compared to standard martensitic grades like SUS410. With 16.00-18.00% chromium, it offers superior protection against atmospheric and mild chemical corrosion, while its martensitic structure allows for heat treatment to achieve high strength and hardness. It is magnetic, has good weldability with proper preheating, and exhibits enhanced ductility and impact resistance, making it suitable for high-stress applications in corrosive environments.

Chemical Composition (wt%)

C: 0.11-0.17, Cr: 16.00-18.00, Ni: 1.50-2.50, Mn ≤ 0.80, Si ≤ 0.80, P ≤ 0.035, S ≤ 0.030

Typical Mechanical Properties (Quenched & Tempered Condition)

Tensile Strength (Rm): ≥ 1080 MPa; Yield Strength (Rp0.2): ≥ 800 MPa; Elongation (A): ≥ 10%; Hardness (HRC): 30-52 (adjustable via heat treatment)

Core Advantages

Nickel addition enhances corrosion resistance and toughness; heat-treatable for adjustable high strength and hardness; better ductility and impact resistance than SUS410/SUS420; magnetic; good weldability with preheating; suitable for high-stress corrosive applications; stable performance in mild chemical environments.

Applications

Automotive components, aircraft parts, turbine blades, valves, pumps, gears, surgical instruments, and high-stress mechanical components requiring high strength and improved corrosion resistance.

Equivalent Grades

EN 1.4057, UNS S43100, GB 17Cr16Ni2, AISI 431

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.