440B Stainless Steel Plate & Coil: Martensitic High-Hardness Wear-Resistant Plate/Coil

What is 440B Stainless Steel Plate & Coil?

440B stainless steel plate & coil is a medium-carbon variant of 440 series, with higher carbon content than 440A, offering enhanced hardness and wear resistance, suitable for medium-load wear-resistant components and cutting tools.

Equivalent Grades (Horizontal)

UNS: S44003 | JIS: SUS440B | GB: 9Cr17 | EN: X90Cr17 | W.Nr.: 1.4029

Chemical Composition (wt%, Horizontal)

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

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

Density: 7.75g/cm³ | Melting Point: 1450-1510°C | Tensile Strength: ≥710N/mm² | Yield Strength: ≥500N/mm² | Elongation: ≥10% | Hardness: 57-59HRC

Core Characteristics

• Enhanced hardness and wear resistance: Higher carbon content than 440A, suitable for medium-load friction scenarios • Reliable corrosion resistance: Maintains good resistance to mild corrosive media, better than ordinary martensitic grades • Good dimensional stability: Controlled deformation during heat treatment, suitable for precision wear components • Medium-load scenario application: Used in high-precision bearings, cutting tools, valve cores and mechanical wear parts

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

C Content: 440B (0.75-0.95%) | 440C (0.95-1.20%) | Hardness: 440B (57-59HRC) | 440C (58-62HRC) | Machinability: 440B (Better) | 440C (Poor) | Wear Resistance: 440B (Better) | 440C (Superior)

 

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.