概述
SUS 440C (UNS S44004 / DIN 1.4125) is a high-carbon martensitic stainless steel known for achieving the highest hardness of all stainless steels — 58-60 HRC after quenching and tempering — combined with good corrosion resistance and excellent wear resistance. As a leading SUS 440C round bar supplier, Vertex Alloy provides diameters from 3 mm to 300 mm in annealed, quenched & tempered, peeled, ground and polished conditions, compliant with ASTM A276, AMS 5630 and JIS G4303, with EN 10204 3.1 mill test certificates. 440C round bars are the first choice for ball and roller bearings, premium knife blades, surgical instruments, valve seats and balls, pump shafts and plastic mold inserts. Free-machining 440F and cross-rolled forged bars available on request. Contact us for the latest price list and stock sizes.
描述（英文）
SUS 440C (UNS S44004, DIN 1.4125) is a high-carbon martensitic stainless steel that achieves the highest hardness of any stainless steel — up to 60 HRC after quenching and tempering — combined with good corrosion resistance in fresh water and mild media. Vertex Alloy supplies 440C round bars from 3 to 300 mm diameter in annealed, quenched & tempered, peeled, ground and polished conditions to ASTM A276 and AMS 5630, with EN 10204 3.1 certificates. Typical applications include ball and roller bearings, premium knife blades, surgical and dental instruments, valve seats and balls, pump shafts and plastic mold inserts. Free-machining 440F and low-carbon alternatives available on request.
尺寸范围
- Dia.3 – 300 mm
- L1000 – 6000 mm
- Available on request
牌号标准
| 标准体系 | 数值 |
|---|---|
| 🇯🇵 JIS | SUS 440C |
| ASTM / AISI | 440C / S44004 |
| DIN / EN | 1.4125 / X105CrMo17 |
| 🇨🇳 GB | 9Cr18Mo / 102Cr17Mo |
| ISO | X105CrMo17 |
化学成分
| 元素 | 数值 |
|---|---|
| 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 |
| Ni | ≤ 0.60 |
| Fe | Balance |
机械性能
| productCenter.property | 数值 |
|---|---|
| Tensile Strength (Annealed) | ≥ 758 MPa |
| Yield Strength (Annealed) | ≥ 448 MPa |
| Elongation (Annealed) | ≥ 14 % |
| Hardness (Annealed) | ≤ 255 HB |
| Hardness (Quenched & Tempered) | ≥ 58 HRC |
| Max Working Hardness | 60 HRC |
| Impact Energy (Annealed) | ≥ 16 J |
物理性能
| 性能 | 单位 | 数值 |
|---|---|---|
| Density | g/cm³ | 7.74 g/cm³ |
| Melting Point | °C | 1370 – 1480 °C |
| Specific Heat Capacity | J/kg·K | 460 J/(kg·K) |
| Thermal Conductivity | W/m·K | 24.2 W/(m·K) |
| Electrical Resistivity | μΩ·cm | 0.60 μΩ·m |
| Elastic Modulus | GPa | 200 GPa |
| Thermal Expansion (20–100 °C) | ×10⁻⁶/K | 10.2 × 10⁻⁶ /K |
| Magnetic | - | Yes |
应用场景
- Bearings
- Cutlery
- Medical
- Valves
- Molds
- Aerospace
- Marine
- Textile