Grade 420 Stainless Steel – Martensitic Alloy With Enhanced Hardness & Corrosion Resistance

Overview

Grade 420 is a martensitic stainless steel with higher carbon content than Grade 410, offering superior hardness and wear resistance after heat treatment. It contains 12.0-14.0% chromium, providing better corrosion resistance than Grade 410, especially in mild chemical and atmospheric environments. Its martensitic structure allows for quenching and tempering to achieve high hardness (up to 50 HRC), making it ideal for applications requiring sharp edges and wear resistance. Unlike austenitic grades, Grade 420 is magnetic and has good machinability when annealed, serving as a preferred choice for cutting tools and precision components.

Chemical Composition (wt%)

C: 0.15-0.25, Cr: 12.00-14.00, Mn ≤ 1.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030, Ni ≤ 0.75

Typical Mechanical Properties (Annealed Condition)

Tensile Strength (Rm): ≥ 550 MPa; Yield Strength (Rp0.2): ≥ 345 MPa; Elongation (A): ≥ 15%; Brinell Hardness (HB): ≤ 223

Core Advantages

Heat-treatable to high hardness and wear resistance; better corrosion resistance than Grade 410; good machinability in annealed state; magnetic; excellent edge retention for cutting tools; suitable for precision components.

Applications

Knives, scissors, surgical instruments, molds, valves, gears, and precision machine parts requiring high hardness and moderate corrosion resistance.

Equivalent Grades

EN 1.4021, UNS S42000, GB 20Cr13, SUS420J1

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.