440B Stainless Steel Round Bar (UNS S44003)
440B Stainless Steel Round Bar is a high-carbon martensitic stainless steel positioned between 440A and 440C, offering a strong balance of high hardness, excellent wear resistance, and moderate corrosion resistance. Identified by UNS S44003, this grade achieves higher hardness and edge retention than 440A, while maintaining better corrosion resistance than 440C.
It is commonly used in cutting tools, bearings, and high-wear mechanical components.
Key Features
- Higher hardness and wear resistance than 440A
- Better corrosion resistance than 440C
- Excellent edge retention and dimensional stability
- Good polishability and surface finish
- Magnetic in all conditions
- Suitable for high-wear and cutting applications
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S44003 |
| AISI | 440B |
| EN | 1.4112 |
| DIN | X90CrMoV18 (approx.) |
| JIS | SUS 440B |
Sizes
- Diameter: 6 mm to 400 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as required
440B Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.75 – 0.95 |
| Chromium (Cr) | 16.0 – 18.0 |
| Molybdenum (Mo) | 0.75 – 1.25 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
UNS S44003 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 780 – 950 MPa |
| Yield Strength (0.2%) | ≥ 480 MPa |
| Elongation | ≥ 8% |
| Hardness | Up to 58 HRC (depending on heat treatment) |
SS 440B Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1480 – 1530°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24 W/m·K |
| Electrical Resistivity | 0.60 µΩ·m |
Types of 440B Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Heat-Treated Round Bar
Applications
- Cutting tools and blades
- Bearings and races
- Precision shafts and pins
- Valve seats and components
- Industrial wear parts
- High-performance mechanical components
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