When manufacturers in Southeast Asia search for materials suitable for deep drawing applications on Alibaba.com, they often encounter multiple stainless steel grades with subtle but significant differences. Copper-added stainless steel, commonly designated as 304Cu or EN 1.4567, represents a specialized variant of the ubiquitous 304 austenitic stainless steel, engineered specifically for enhanced formability in demanding forming operations.
• **Copper **(Cu) 2.0-3.5% — The key differentiator from standard 304 • **Nickel **(Ni) 8.5-10.5% — Slightly higher than standard 304's 8-10.5% • **Chromium **(Cr) 17.5-19.5% — Consistent with 304 family • **Carbon **(C) ≤0.08% — Low carbon for weldability • **Manganese **(Mn) ≤2.0% — Standard austenitic range • **Silicon **(Si) ≤1.0% — Deoxidizer • **Iron **(Fe) Balance — Remainder composition [2][3]
The copper addition is not arbitrary metallurgy—it serves a specific mechanical purpose. Copper enhances the austenitic stability during cold working, reducing the work hardening rate that makes standard 304 challenging to form in complex deep drawing operations. This translates to fewer cracking incidents, reduced springback, and the ability to achieve deeper draws in fewer stages.
304Cu vs Standard 304 vs 316: Mechanical Properties Comparison
| Property | 304Cu (1.4567) | 304 Standard | 316 (Marine Grade) |
|---|---|---|---|
| Tensile Strength | 515-720 MPa | 515-620 MPa | 515-680 MPa |
| Yield Strength (0.2%) | ≥205 MPa | ≥205 MPa | ≥205 MPa |
| Elongation (%) | ≥40-45% | ≥35-40% | ≥35-40% |
| Hardness | ≤201 HB / 95 HRB | ≤192 HB / 92 HRB | ≤192 HB / 92 HRB |
| Copper Content | 2.0-3.5% | ≤0.75% | ≤0.75% |
| Nickel Content | 8.5-10.5% | 8.0-10.5% | 10.0-14.0% |
| Corrosion Resistance | Good | Good | Excellent |
| Formability Rating | Excellent | Good | Good |
| Relative Cost | +5-10% vs 304 | Baseline | +75-100% vs 304 |
For suppliers looking to sell on Alibaba.com, understanding these specifications is critical. Southeast Asian buyers—particularly in Indonesia, Vietnam, and Thailand—are increasingly sophisticated in their material requirements. They don't just want 'stainless steel'; they want the right grade for their specific deep drawing application, whether it's cookware, automotive components, electrical enclosures, or fasteners.

