SUS304Cu Austenitic Stainless Steel Plate/Coil
SUS304Cu Austenitic Stainless Steel Plate/Coil - JIS G4304/G4305 Data Sheet & Properties
Complete technical data for SUS304Cu stainless steel as per JIS G4304 and G4305, covering chemical composition, mechanical and physical properties, international equivalents, and typical applications.
Cold heading, deep drawing, stamping, bending, welding, machining
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
SUS304Cu Austenitic Stainless Steel Plate/Coil Introduction
SUS304Cu is an austenitic stainless steel with copper addition, standardized in JIS G4304 (hot-rolled plate/coil) and JIS G4305 (cold-rolled plate/coil). The copper content (0.70–1.30%) improves cold formability, deep drawability, and resistance to stress corrosion cracking compared to standard SUS304. It retains the excellent corrosion resistance and non-magnetic properties of the 18-8 type stainless steel.
- Excellent cold heading and deep drawing capabilities
- Good weldability without post-weld annealing
- Enhanced formability for complex shapes
- Widely used in fasteners, kitchenware, and architectural applications
SUS304Cu Austenitic Stainless Steel Plate/Coil Chemical Composition
The alloying elements are controlled to ensure austenitic microstructure, corrosion resistance, and formability. Copper is the key addition enhancing cold workability. All values are weight percent according to JIS G4305 (latest revision). Single values indicate maximum limits unless a range is shown.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.08 | Maximum |
| Si | ≤ 1.00 | Maximum |
| Mn | ≤ 2.00 | Maximum |
| P | ≤ 0.045 | Maximum |
| S | ≤ 0.030 | Maximum |
| Ni | 8.00 – 10.50 | Range |
| Cr | 18.00 – 20.00 | Range |
| Cu | 0.70 – 1.30 | Key element for formability |
SUS304Cu Austenitic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
The physical properties are similar to standard 304 stainless steel because copper addition has only a minor influence. Values provided are typical for fully annealed material and are not part of the mandatory JIS specification. They serve as design guidance.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.93 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 193 | GPa | 20°C |
| Shear Modulus (G) | 74 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 | — | 20°C |
| Thermal Expansion Coefficient (α) | 16.0 × 10⁻⁶ | /K | 0 – 100°C |
| Thermal Expansion Coefficient (α) | 17.0 × 10⁻⁶ | /K | 0 – 300°C |
| Thermal Expansion Coefficient (α) | 18.0 × 10⁻⁶ | /K | 0 – 500°C |
| Thermal Conductivity (λ) | 16.3 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 21.5 | W/(m·K) | 500°C |
| Specific Heat Capacity | 0.50 | J/(g·K) | 0 – 100°C |
| Electrical Resistivity (ρₑ) | 0.72 | μΩ·m | 20°C |
SUS304Cu Austenitic Stainless Steel Plate/Coil Mechanical Properties
The following properties apply to solution-annealed material (standard delivery condition) as per JIS G4305 for cold-rolled plate/coil. Values are minimum requirements unless otherwise indicated. Elongation and bend test conditions depend on product thickness.
| Property | Standard Required Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH, 0.2% offset) | ≥ 205 | MPa | Room temperature |
| Tensile Strength (Rm) | ≥ 520 | MPa | Room temperature |
| Elongation (A) | ≥ 40 | % | Thickness ≤ 3 mm, gauge length 50 mm |
| Elongation (A) | ≥ 40 | % | Thickness > 3 mm to ≤ 8 mm, gauge length 50 mm |
| Hardness | ≤ 200 | HV | — |
| Hardness | ≤ 90 | HRB | — |
| Hardness | ≤ 187 | HBW | — |
| Bend Test (180°) | No cracks, bend radius = plate thickness | — | Thickness ≤ 8 mm |
SUS304Cu Austenitic Stainless Steel Plate/Coil Equivalent Materials and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240 / A240M | S30400 (304) | Same base chemistry but without Cu; may substitute in less demanding forming applications. |
| EU | EN 10088-2 | 1.4301 (X5CrNi18-10) | Similar base composition without Cu; mechanical properties comparable, formability slightly lower. |
| USA | ASTM A240 / A240M | S30430 (302HQ) | Contains Cu (3.0–4.0%) intended for cold heading; Cu content higher than SUS304Cu. |
SUS304Cu Austenitic Stainless Steel Plate/Coil Application Introduction
SUS304Cu is specifically designed for components that require extensive cold forming, such as deep drawing and cold heading. Its balanced composition allows the production of complex shapes without intermediate annealing, saving cost and improving productivity. It is also suitable for mild corrosive environments where 18-8 stainless steel is normally used.
Product Applications: Kitchen sinks and countertops, Deep-drawn pots, pans, and tableware, Automotive exhaust flanges and heat shields, Elevator panels and decorative laminates, Fastener products (bolts, screws, rivets)
Processed into products: Cold-headed bolts, nuts, and studs, Deep-drawn cups, cans, and housings, Stamped brackets, clips, and springs, Welded assemblies requiring post-form dimensional accuracy, Precision turned parts for instruments
Application industries: Automotive (fasteners, trim, exhaust components), Kitchenware and household appliances, Architectural and construction hardware, Consumer electronics and precision machinery, Food processing equipment
SUS304Cu Austenitic Stainless Steel Plate/Coil Similar and Substitute Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS304 | The base grade without Cu; lower cold formability but otherwise identical mechanical minimums. |
| Japan | JIS G4305 | SUS304L | Low-carbon version of 304; better weldability but slightly lower strength, no Cu. |
| Japan | JIS G4305 | SUSXM7 (SUS 304Cu) | Often used interchangeably; JIS designates SUS304Cu and SUSXM7 as distinct; confirm composition. |
| USA | ASTM A493 | S30430 | Cold heading quality with higher Cu; suitable for fasteners but may require process adjustment. |
Notes:
- Delivery surface finishes typically available: No.2B, BA, No.4, HL, etc., as per JIS G4305.
- For improved corrosion resistance in welded condition, stress relief annealing may be recommended.
- Cu addition can cause a slight decrease in work hardening rate, making it suitable for multistage forming.
- Magnetic permeability after heavy cold work may increase slightly but remains low compared to ferritic grades.
- Always refer to the latest issue of the JIS standard for precise application limits.
- Share
