UNS S42000 – Medium-Carbon Martensitic Alloy for Enhanced Hardness & Wear Resistance

Overview

UNS S42000 is a medium-carbon martensitic stainless steel, featuring a higher carbon content than UNS S41000, which enables superior hardness and wear resistance after heat treatment. With 12.0-14.0% chromium, it offers better corrosion resistance than UNS S41000, particularly in atmospheric and mild chemical environments. Its martensitic structure allows for quenching and tempering to achieve a hardness of 50-55 HRC, making it ideal for applications requiring sharp edges and wear durability. It is magnetic, has good machinability when annealed, and serves as an economical alternative to higher-carbon martensitic grades for cutting tools and precision components.

Chemical Composition (wt%)

C: 0.16-0.25, Cr: 12.00-14.00, Mn ≤ 1.50, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.015, Ni ≤ 0.75

Typical Mechanical Properties (Quenched & Tempered Condition)

Tensile Strength (Rm): ≥ 850 MPa; Yield Strength (Rp0.2): ≥ 550 MPa; Elongation (A): ≥ 10%; Hardness (HRC): 50-55

Core Advantages

Heat-treatable to high hardness and wear resistance; better corrosion resistance than UNS S41000; good machinability in the annealed state; magnetic; excellent edge retention for cutting tools; cost-effective for precision components; good surface polishability for decorative or functional parts.

Applications

Knives, scissors, surgical instruments, plastic molds, valve components, gears, pump parts, and耐磨机械零件 in mild corrosive environments (avoiding chloride-rich conditions).

Equivalent Grades

EN 1.4021, AISI 420, 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.