440C Stainless Steel Round Bar (UNS S44004)
440C Stainless Steel Round Bar is a high-carbon martensitic stainless steel known for its exceptional hardness, excellent wear resistance, and good corrosion resistance after proper heat treatment. With the highest carbon content among the 440 series, 440C is widely used in applications requiring sharp cutting edges, high load-bearing capacity, and dimensional stability.
Key Features
- High hardness achievable through heat treatment (up to ~58–60 HRC)
- Excellent wear and abrasion resistance
- Good corrosion resistance in mild to moderately corrosive environments
- Good strength and fatigue resistance
- Maintains sharp edges for long service life
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 440C |
| UNS | S44004 |
| EN | 1.4125 |
| DIN | X105CrMo17 |
| JIS | SUS 440C |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 300 mm | 3 m, 6 m, or Cut to Length |
| 1/4” – 12” | As per requirement |
440C Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.95 – 1.20 |
| Chromium (Cr) | 16.0 – 18.0 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Molybdenum (Mo) | 0.40 – 0.80 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
UNS S44004 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ~760 MPa |
| Yield Strength | ~450 MPa |
| Elongation | ~5% |
| Hardness | 58–60 HRC |
SS 440C Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 7.7 g/cm³ |
| Melting Point | ~1480°C |
| Thermal Conductivity | ~24 W/m·K |
| Electrical Resistivity | ~0.6 µΩ·m |
Types of 440C Stainless Steel Round Bar
- Hot Rolled 440C Round Bar
- Cold Drawn 440C Round Bar
- Precision Ground 440C Round Bar
- Hardened & Tempered 440C Round Bar
Applications
- Bearings and bearing races
- Surgical and medical instruments
- Cutting tools and industrial knives
- Valves, shafts, and pump components
- High-performance molds and dies
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