SUS403 Martensitic Stainless Steel Plate/Coil (JIS G4304/G4305)
JIS G4304 SUS403 Martensitic Stainless Steel Plate/Coil – Composition, Properties & Equivalents
Explore detailed technical data for SUS403 stainless steel per JIS G4304/G4305: chemical composition, mechanical and physical properties, equivalent standards, and industrial applications.
Hot rolling, cold rolling, annealing, quenching, tempering
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SUS403 Martensitic Stainless Steel Plate/Coil Introduction
SUS403 is a martensitic stainless steel standardized under JIS G4304 (hot-rolled) and JIS G4305 (cold-rolled), primarily supplied as plate, sheet, and coil. It contains 11.5–13.0% chromium, which provides moderate corrosion resistance in mild environments, along with elevated-temperature strength. The alloy is typically supplied in the annealed condition for improved formability and can be subsequently hardened by quenching and tempering to achieve a combination of high strength, hardness, and adequate toughness. Due to its lower silicon content compared to standard 410 grades, SUS403 exhibits better ductility and is widely used for components requiring high dynamic loading, such as steam turbine blades, compressor parts, and valve trim. The grade also demonstrates satisfactory weldability with proper preheating and post-weld heat treatment.
SUS403 Martensitic Stainless Steel Plate/Coil Chemical Composition
The chemical composition of SUS403 martensitic stainless steel is defined in JIS G4304 and G4305. Tight control of alloying elements ensures the necessary balance of corrosion resistance, hardenability, and mechanical properties. The values listed represent the maximum or range limits as specified by the standard.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.15 | |
| Silicon (Si) | ≤ 0.50 | |
| Manganese (Mn) | ≤ 1.00 | |
| Phosphorus (P) | ≤ 0.040 | |
| Sulfur (S) | ≤ 0.030 | |
| Nickel (Ni) | ≤ 0.60 | |
| Chromium (Cr) | 11.50 – 13.00 | Key for corrosion resistance and hardenability |
SUS403 Martensitic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Physical properties of SUS403 stainless steel in the annealed condition. These values are representative for engineering calculations and may vary slightly with actual composition and heat treatment. Data compiled from published technical literature.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.80 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | At 20 °C |
| Shear Modulus (G) | 77 | GPa | At 20 °C |
| Poisson's Ratio (ν) | 0.30 | – | At 20 °C |
| Thermal Expansion Coefficient (α) | 10.3 | 10⁻⁶/K | 20 – 100 °C |
| Thermal Expansion Coefficient (α) | 11.1 | 10⁻⁶/K | 20 – 400 °C |
| Thermal Conductivity (λ) | 25.0 | W/(m·K) | At 100 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20 – 100 °C |
| Electrical Resistivity (ρ_e) | 0.57 | µΩ·m | At 20 °C |
SUS403 Martensitic Stainless Steel Plate/Coil Mechanical Properties
Mechanical properties for annealed SUS403 stainless steel plate/sheet/coil in accordance with JIS G4304. Requirements apply to material in the solution-annealed condition at room temperature. Actual properties in the quenched-and-tempered condition are significantly higher and depend on heat treatment parameters.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 440 | MPa | Annealed, thickness ≤ 160 mm |
| Yield Strength (ReH) | ≥ 205 | MPa | Annealed, thickness ≤ 160 mm, 0.2% offset |
| Elongation (A) | ≥ 20 | % | Annealed, gauge length 50 mm, thickness > 5 mm |
| Hardness | ≤ 201 | HBW | Annealed condition |
SUS403 Martensitic Stainless Steel Plate/Coil Identical Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA / International | ASTM A240/A240M | 403 (UNS S40300) | Full equivalent in chemical composition, mechanical properties, and application scope. |
SUS403 Martensitic Stainless Steel Plate/Coil Application Introduction
SUS403 is predominantly applied in components that require a combination of moderate corrosion resistance and high strength at elevated temperatures. Its better ductility, resulting from controlled silicon content, makes it particularly suitable for dynamically loaded parts. Common end-use sectors and products include:
Product Applications: Steam turbine blades and buckets, Compressor blades and rotors, High-temperature bolting and fasteners, Valve trim (stems, seats, discs)
Processed into products: Turbine blades and vanes, Pump shafts and impellers, Valve stems and gate wedges, Compressor discs and spacers
Application industries: Power generation (steam and gas turbines), Industrial machinery (compressors, pumps), Automotive (exhaust and turbocharger components), Chemical processing (valves, fittings)
SUS403 Martensitic Stainless Steel Plate/Coil Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304 | SUS410 | Slightly higher Si limit (≤1.00), otherwise similar base composition; common alternative for general martensitic stainless applications. |
| Europe | EN 10088-2 | X12Cr13 (1.4006) | Similar Cr content; contains ≤0.15% C and may differ in Si/Ni tolerances; suitable for many 403-type applications. |
| China | GB/T 20878, GB/T 4237 | 12Cr13 (1Cr13) | Comparable martensitic stainless with relatively close mechanical properties; verify exact composition for critical parts. |
Notes:
- For optimal mechanical properties, SUS403 should be hardened by heating to 950–1050 °C followed by oil/air quenching and tempering at 200–400 °C.
- Welding requires preheating to 200–300 °C and post-weld annealing to avoid cracking. Matching filler metals should be selected based on service conditions.
- Surface finish and dimensional tolerances for plate/coil follow the respective JIS G4304/G4305 requirements.
- Material may be supplied with additional test certifications such as Charpy impact testing if specified in the purchase order.
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