403 Stainless Steel Round Bar (UNS S40300)
403 Stainless Steel Round Bar is a martensitic stainless steel grade designed primarily for applications requiring moderate corrosion resistance combined with high mechanical strength and wear resistance. Identified by UNS S40300, this alloy is essentially a modified version of 410 stainless steel with controlled composition to improve hardenability and toughness.
It is commonly used in turbine components, pump shafts, valve parts, and aerospace applications where strength at elevated temperatures is important.
Key Features
- Good corrosion resistance in mild atmospheric and industrial environments
- High strength and hardness after heat treatment
- Excellent wear and fatigue resistance
- Good machinability in annealed condition
- Stable mechanical properties at elevated temperatures
- Cost-effective martensitic stainless steel grade
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S40300 |
| AISI | 403 |
| DIN | X7Cr13 |
| EN | 1.4000 (approx.) |
| JIS | SUS 403 |
Sizes
- Diameter: 6 mm to 450 mm
- Length: 3 m, 6 m, or cut-to-length
- Tolerance: H8 / H9 / H11 or as specified
403 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Chromium (Cr) | 11.5 – 13.0 |
| Nickel (Ni) | ≤ 0.50 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
UNS S40300 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 – 850 MPa |
| Yield Strength (0.2%) | ≥ 415 MPa |
| Elongation | ≥ 15% |
| Hardness | 35 – 45 HRC (depending on heat treatment) |
SS 403 Round Bar 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 403 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Centerless Ground Bar
- Hardened & Tempered Bar
Applications
- Steam and gas turbine blades
- Pump shafts and impellers
- Valve components
- Aerospace structural parts
- Bolts, studs, and fasteners
- Industrial machinery parts
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