🟧 Product Overview
440C stainless steel is the highest‑carbon and highest‑hardness grade in the martensitic stainless steel family. It offers:
- Exceptional hardness (up to HRC 56–60)
- Outstanding wear resistance
- High mechanical strength
- Good corrosion resistance for a high‑carbon steel
- Magnetic martensitic structure
- Excellent performance after quenching and tempering
Because of its superior hardness and wear resistance, 440C is widely used in high‑precision tools, bearings, high‑end knives, and mechanical seals.
🟧 Key Features
- Highest hardness among martensitic stainless steels
- Excellent wear resistance and edge retention
- Strong mechanical strength
- Heat‑treatable to very high hardness levels
- Suitable for precision machining
- Ideal for high‑load, high‑wear environments
🟧 Standards
- ASTM A240 / A480
- JIS G4304 / G4305 (SUS440C)
- EN 10088‑2 (1.4125)
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 440C (%) |
|---|
| C | 0.95–1.20 |
| Cr | 16.0–18.0 |
| Ni | ≤0.75 |
| Mn | ≤1.0 |
| Si | ≤1.0 |
| S | ≤0.03 |
| Fe | Balance |
Note: The extremely high carbon content is the key factor behind 440C’s maximum hardness and wear resistance.
🟧 Mechanical Properties (Typical)
| Property | Value |
|---|
| Yield Strength | ≥285 MPa |
| Tensile Strength | ≥760 MPa |
| Hardness (HRC) | 56–60 (after heat treatment) |
🟧 Product Specifications
Thickness
Width
Surface Finishes
🟧 Applications
- Bearings
- Mechanical seals
- Precision components
- Premium knives
- Industrial blades
- Cutting instruments
Wear‑Resistant Components
- Shafts
- Wear plates
- High‑load mechanical parts
🟧 Why Choose WelSteels
- Professional supply of 440C stainless steel coil
- Highest hardness and wear resistance in the martensitic series
- Stable heat‑treatable performance
- SGS / BV inspection available
- Export‑grade seaworthy packaging
