SUS440 Stainless Steel Plate & Coil: Martensitic Ultra-High Hardness Wear-Resistant Plate/Coil

What is SUS440 Stainless Steel Plate & Coil?

SUS440 stainless steel plate & coil (including 440A/B/C variants) is a high-carbon high-chromium martensitic product, featuring ultra-high hardness and wear resistance after heat treatment. It is specialized for high-wear, high-precision components requiring extreme durability.

Equivalent Grades (Horizontal)

440A: UNS S44002, JIS SUS440A, W.Nr. 1.4028; 440B: UNS S44003, JIS SUS440B, W.Nr. 1.4029; 440C: UNS S44004, JIS SUS440C, W.Nr. 1.4034; GB: 8Cr17 (440A), 11Cr17 (440C)

Chemical Composition (wt%, Horizontal)

440A: C 0.60-0.75; 440B: C 0.75-0.95; 440C: C 0.95-1.20, Mo 0.75-1.25; All: Cr 16.00-18.00, Si ≤1.00, Mn ≤1.00, Fe Balance

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

Hardness: 440A (55-57HRC), 440B (57-59HRC), 440C (58-62HRC); Tensile ≥690-735N/mm²; Elongation ≥10-12%; Density: 7.75g/cm³, Melting Point: 1450-1510°C

Core Characteristics

• Gradient hardness variants: 440A (machinable), 440B (balanced), 440C (ultra-hard) to match diverse wear requirements • Ultra-high wear resistance: Ideal for extreme friction scenarios, maintaining structural integrity under heavy load • Good corrosion resistance: High chromium content resists mild corrosive media, better than ordinary martensitic grades • Specialized applications: Cutting tools, high-speed bearings, mold plates, precision wear parts and industrial blades

SUS440C vs SUS420J1 Stainless Steel Plate & Coil (Horizontal)

C Content: 440C (0.95-1.20%) | 420J1 (0.16-0.25%) | Hardness: 440C (58-62HRC) | 420J1 (≥248HB) | Wear Resistance: 440C (Superior) | 420J1 (Excellent) | Machinability: 440C (Poor) | 420J1 (Better)

 

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.