420 Stainless Steel Round Bar (UNS S42000)
420 Stainless Steel Round Bar is a high-carbon martensitic stainless steel known for its excellent hardness, high strength, and good corrosion resistance when properly heat treated. Identified by UNS S42000, this grade can be hardened to a very high level, making it ideal for applications requiring sharp edges, wear resistance, and durability.
It is widely used in cutlery, surgical instruments, tooling, and industrial components.
Key Features
- Very high hardness after heat treatment
- Good corrosion resistance in mild environments
- Excellent wear and abrasion resistance
- Good polishability and surface finish
- Magnetic in all conditions
- Suitable for precision and cutting applications
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S42000 |
| AISI | 420 |
| EN | 1.4021 / 1.4028 |
| DIN | X20Cr13 / X30Cr13 |
| JIS | SUS 420 |
Sizes
- Diameter: 6 mm to 450 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as required
420 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.15 – 0.40 |
| Chromium (Cr) | 12.0 – 14.0 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
UNS S42000 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 700 – 900 MPa |
| Yield Strength (0.2%) | ≥ 450 MPa |
| Elongation | ≥ 10% |
| Hardness | Up to 50–55 HRC (depending on heat treatment) |
SS 420 Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1480 – 1530°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24.9 W/m·K |
| Electrical Resistivity | 0.55 µΩ·m |
Types of 420 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Heat-Treated Round Bar
Applications
- Surgical and dental instruments
- Cutlery and knives
- Shafts, pins, and fasteners
- Tooling and dies
- Pump and valve components
- Industrial machinery parts
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