440 Stainless Steel Plate & Coil: Ultra-High Hardness Martensitic Cutting Tool Plate/Coil

What is 440 Stainless Steel Plate & Coil?

440 stainless steel plate & coil is a high-carbon high-chromium martensitic stainless steel product, featuring ultra-high hardness and wear resistance after heat treatment. It is specialized for cutting tools, bearings and high-wear precision components.

Equivalent Grades (Horizontal)

UNS: S44002 (440A) / S44003 (440B) / S44004 (440C) | JIS: SUS440A/B/C | GB: 8Cr17 (440A) | EN: X90Cr18 (440C) | W.Nr.: 1.4028 (440A)

Chemical Composition (wt%, Horizontal, 440C)

C: 0.95-1.20 | Si: ≤1.00 | Mn: ≤1.00 | P: ≤0.040 | S: ≤0.030 | Cr: 16.00-18.00 | Mo: 0.75-1.25 | Fe: Balance

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

Density: 7.75g/cm³ | Melting Point: 1450-1510°C | Tensile Strength: ≥735N/mm² | Yield Strength: ≥540N/mm² | Elongation: ≥10% | Hardness: ≥58HRC

Core Characteristics

• Ultra-high hardness: After quenching and tempering, hardness reaches 58-62HRC, with exceptional wear resistance • Strong corrosion resistance: High chromium content enhances resistance to mild corrosive media, suitable for harsh working conditions • Good dimensional stability: Low deformation during heat treatment, ensuring precision of cutting tools and components • Specialized for high-wear scenarios: Applied in cutting tools, bearings, valves and high-precision wear-resistant parts

440C vs 420 Stainless Steel Plate & Coil (Horizontal)

C Content: 440C (0.95-1.20%) | 420 (0.16-0.25%) | Hardness: 440C (Ultra-High) | 420 (High) | Wear Resistance: 440C (Superior) | 420 (Excellent) | Machinability: 440C (Poor) | 420 (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.