SUS420J1/J2 Stainless Steel Plate & Coil: Martensitic High-Hardness Precision Plate/Coil

What is SUS420J1/J2 Stainless Steel Plate & Coil?

SUS420J1/J2 stainless steel plates & coils are medium-carbon martensitic stainless steel products, with J2 featuring slightly lower carbon content for better machinability. Both offer high hardness after heat treatment, combining wear resistance and moderate corrosion resistance for precision components.

Equivalent Grades (Horizontal)

J1: UNS S42000, JIS SUS420J1, GB 20Cr13, EN X20Cr13, W.Nr. 1.4021; J2: UNS S42020, JIS SUS420J2, GB 14Cr17Ni2, EN X17CrNi16-2, W.Nr. 1.4057

Chemical Composition (wt%, Horizontal)

J1: C 0.16-0.25, Si ≤1.00, Mn ≤1.00, P ≤0.045, S ≤0.030, Cr 12.00-14.00; J2: C 0.15-0.20, Cr 16.00-18.00, Ni 1.50-2.50; Both: Fe Balance

Key Properties (20°C, Quenched & Tempered, Horizontal)

J1: Tensile ≥630N/mm², Yield ≥440N/mm², Elongation ≥12%, Hardness ≥248HB; J2: Tensile ≥700N/mm², Yield ≥500N/mm², Elongation ≥10%, Hardness ≥269HB; Density: 7.70g/cm³, Melting Point: 1470-1520°C

Core Characteristics

• High hardness after heat treatment: Quenching & tempering enhances surface hardness, ideal for wear-resistant precision parts and tooling plates • J1/J2 differentiation: J1 prioritizes hardness, J2 adds nickel for better toughness and corrosion resistance • Good dimensional stability: Low deformation during heat treatment, suitable for precision plate/coil processing • Versatile applications: J1 for molds, valve cores; J2 for high-precision mechanical parts, surgical instruments and decorative hardware

SUS420J1/J2 vs SUS440 Stainless Steel Plate & Coil (Horizontal)

C Content: 420J1/J2 (0.15-0.25%) | 440 (0.60-1.20%) | Hardness: 420J1/J2 (High) | 440 (Ultra-High) | Machinability: 420J1/J2 (Better) | 440 (Poor) | Cost: 420J1/J2 (Medium) | 440 (Medium-High)

 

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.