SUS304J2 Austenitic Stainless Steel
SUS304J2 Austenitic Stainless Steel: JIS G4304/G4305 Plate & Coil Data, Equivalents & Applications
Complete technical data for SUS304J2 austenitic stainless steel plate and coil according to JIS G4304 and G4305, including chemical composition, mechanical and thermo-physical properties, international equivalents, and application guidelines.
Deep drawing, spinning, stamping, bending, welding, machining (after solution annealing)
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SUS304J2 Austenitic Stainless Steel Introduction
SUS304J2 is a copper-alloyed austenitic stainless steel specified in JIS G4304 (hot-rolled stainless steel plates) and JIS G4305 (cold-rolled stainless steel plates). By adding 1.00 – 3.00% copper to the conventional 18Cr-8Ni base, this grade exhibits enhanced cold formability, deep drawability, and reduced work hardening rate while maintaining good corrosion resistance and weldability. It is typically supplied in the solution-annealed condition and is widely used for deep-drawn components such as kitchen sinks, household appliances, electronic enclosures, and automotive trim parts. The material combines the classic characteristics of Type 304 with improved ductility and a lower tendency for delayed cracking after severe forming.
SUS304J2 Austenitic Stainless Steel Chemical Composition
Chemical composition limits for SUS304J2 according to JIS G4304:2012 and JIS G4305:2012. The copper addition (1.00–3.00%) is the key differentiator from standard SUS304, reducing the work hardening rate and permitting more severe cold forming without cracking.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.08 | Weight % |
| Silicon (Si) | ≤1.00 | Weight % |
| Manganese (Mn) | ≤2.00 | Weight % |
| Phosphorus (P) | ≤0.045 | Weight % |
| Sulfur (S) | ≤0.030 | Weight % |
| Nickel (Ni) | 8.00 – 11.00 | Weight % |
| Chromium (Cr) | 17.00 – 19.00 | Weight % |
| Copper (Cu) | 1.00 – 3.00 | Weight % |
SUS304J2 Austenitic Stainless Steel Thermo-Physical & Electrical Properties
Typical physical properties for SUS304J2 at ambient and elevated temperatures. Data are based on published values for the 17Cr-9Ni austenitic family and are applicable to the solution-annealed condition.
- Thermal expansion exhibits a moderate increase with temperature.
- Thermal conductivity is relatively low compared to carbon steels, a typical characteristic of austenitic stainless steels.
- Electrical resistivity is higher than that of ferritic grades, making it suitable for heating elements or resistance applications where moderate resistivity is desired.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.93 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 193 | 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) | 17.2 | 10⁻⁶/K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 17.8 | 10⁻⁶/K | 20–200 °C |
| Thermal Expansion Coefficient (α) | 18.4 | 10⁻⁶/K | 20–300 °C |
| Thermal Expansion Coefficient (α) | 18.9 | 10⁻⁶/K | 20–400 °C |
| Thermal Conductivity (λ) | 16.2 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 17.3 | W/(m·K) | At 200 °C |
| Specific Heat Capacity (cp) | 500 | J/(kg·K) | 20–100 °C |
| Electrical Resistivity (ρ_e) | 0.73 | μΩ·m | At 20 °C |
SUS304J2 Austenitic Stainless Steel Mechanical Properties
Minimum mechanical properties for SUS304J2 plates and coils in the solution-annealed condition as required by JIS G4304/G4305.
- Yield strength (0.2% proof stress) ≥ 205 MPa.
- Tensile strength ≥ 520 MPa.
- Elongation values depend on product thickness; for cold-rolled sheets up to 8 mm thickness, elongation typically exceeds 40%.
- Hardness is controlled to ensure formability (≤187 HBW or ≤90 HRB).
Values are for reference at room temperature.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH, 0.2% offset) | ≥ 205 | MPa | Solution annealed, thickness ≤80 mm |
| Tensile Strength (Rm) | ≥ 520 | MPa | Solution annealed, thickness ≤80 mm |
| Elongation (A) | ≥ 40 | % | Thickness ≤8 mm (G4304/G4305) |
| Elongation (A) | ≥ 40 | % | Thickness 8–40 mm (G4304) |
| Elongation (A) | ≥ 30 | % | Thickness 40–80 mm (G4304) |
| Hardness (HBW) | ≤ 187 | HBW | Solution annealed |
| Hardness (HRB) | ≤ 90 | HRB | Solution annealed |
SUS304J2 Austenitic Stainless Steel Full Equivalent Material Standards & Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304 / G4305 | SUS304J2 | Original specification |
| USA | ASTM A240/A240M | 304Cu (UNS S30430) | Identical composition and mechanical property requirements |
| China | GB/T 3280 (stainless steel plate/sheet) | 06Cr18Ni9Cu2 (S30430) | Former grade 0Cr18Ni9Cu2; equivalent to SUS304J2 |
| International | ISO 15510 | X5CrNiCu17-8-2 | Close match; Cu range may differ slightly |
SUS304J2 Austenitic Stainless Steel Application Introduction
SUS304J2 is engineered for applications that demand extensive cold working and deep drawing. The presence of copper reduces work hardening, allowing the material to withstand severe deformation without intermediate annealing, leading to cost savings in manufacturing. Typical uses are found in consumer products, automotive components, and industrial containers where both corrosion resistance and complex shapes are required.
Product Applications: Kitchen sinks and basins, Home appliance bodies (washing machine tubs, refrigerator panels), Electronic device housings (laptops, mobile phones), Automotive decorative trim, fuel tank covers, Deep-drawn containers for chemical and food industries, Heat exchanger parts requiring moderate formability
Processed into products: Deep-drawn kitchen sink bowls, Pressed automotive inner panels, Spun cylindrical containers, Bending-formed architectural cladding profiles, Stamped flanges and brackets for electronic devices, Welded tube elements for structural applications
Application industries: Household appliance manufacturing, Automotive industry (trim, fuel systems), Electronics and telecommunications enclosures, Food processing and kitchen equipment, Architectural and construction
SUS304J2 Austenitic Stainless Steel Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS304 | Standard 18Cr-8Ni; lacks Cu, lower deep drawability; general purpose replacement |
| USA | ASTM A240/A240M | 304 (UNS S30400) | Corrosion resistance similar; formability slightly inferior for deep drawing |
| Japan | JIS G4304/G4305 | SUS304L | Low carbon variant; improved intergranular corrosion resistance; no Cu |
| Japan | JIS G4304/G4305 | SUS304J1 | Contains Cu 0.50–1.00%; intermediate deep drawing performance between SUS304 and SUS304J2 |
Notes:
SUS304J2 is non-magnetic in the solution-annealed condition but may become slightly magnetic after severe cold working. Welding can be performed by common methods (TIG, MIG, resistance welding) using filler metals matching or slightly over-alloyed with Ni and Cu. For improved intergranular corrosion resistance in welded components, a low-carbon variant (not standardized) or post-weld solution annealing is recommended. The data provided are based on JIS G4304:2012 and JIS G4305:2012, and typical physical property values from recognized stainless steel reference sources. Actual properties may vary depending on specific processing and product thickness.
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