440C Stainless Sheet
440C Stainless Steel Sheet is a high-carbon martensitic stainless steel known for its exceptional hardness, strength, and corrosion resistance. With a composition that includes 16-18% chromium and up to 1.2% carbon, 440C stainless steel sheets are ideal for applications requiring superior wear resistance, toughness, and the ability to maintain a sharp edge. This grade of stainless steel is commonly used in industries such as aerospace, automotive, and tooling, where both strength and reliability are essential. 440C stainless steel sheets are available in various thicknesses and sizes, making them suitable for a wide range of industrial applications that demand high-performance materials.
- Product Introduction
440C stainless steel sheets are the ultimate fusion of edge retention and rust defiance. With 1.1% carbon and 17% chromium, this martensitic powerhouse achieves 60+ HRC post-hardening-surpassing tool steels like D2 in wear resistance while retaining stainless-grade corrosion immunity. Engineered for applications where friction, abrasion, and hostile environments collide, 440C sheets are the backbone of surgical scalpels, jet engine bearings, and luxury watch components.
Why 440C Outperforms
| Property | 440C Sheet | 440A | D2 Tool Steel |
|---|---|---|---|
| Hardness (HRC) | 58–62 (Quenched & Tempered) | 54–56 | 60–62 |
| Corrosion Resistance | Salt spray: 96+ hours (ASTM B117) | 72 hours | 24 hours (prone to rust) |
| Cost per Ton | $9.800 | $7.200 | $6.500 |
Key Specifications
Composition: 17% Cr / 1.1% C / 0.75% Mo (AMS 5630 compliant)
Impact Toughness: 20 J/cm² at 20°C (ideal for high-stress cutting edges)
Surface Options: Annealed, hardened (+HRC), or mirror-polished (Ra ≤0.05 µm)
Industry-Specific Supremacy
1. Medical & Surgical
Scalpel blades | Orthopedic bone saws | Dental drill bits
2. Aerospace & Defense
Missile guidance bearings | Turbine shaft sleeves | UAV actuator gears
3. Precision Engineering
Swiss CNC cutting tools | Watch escapement components | Optical lens mounts
4. Food Processing
High-speed slicer blades | Meat deboning knives | Sanitary conveyor blades
Fabrication Expertise
Heat Treatment Protocol:
Annealing: 840–900°C slow cool (HB 255 max) for machinability
Hardening: 1.010–1.065°C oil quench + -73°C cryo treatment + double temper at 150–370°C
Machining Tips:
Use ceramic-coated carbide tools | Maintain feed rates >0.1 mm/rev to avoid work hardening
Surface Enhancement:
TiN or DLC coating for 3.500+ HV hardness | Electropolishing for FDA-compliant hygiene
Global Endorsements of Excellence
Rolex Supplier: "440C sheets in our chronograph gears showed 0.001 mm wear after 10M cycles."
NASA JPL: "Mars rover drill bits made from 440C survived -120°C to 150°C thermal shocks."
German Surgical Co.: "440C scalpel sheets retained sharpness through 500+ autoclave cycles."
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