Can 1.4301 stainless steel and STS304 be used interchangeably?
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1.4301 and STS304 stainless steel replacement guide
1. Grade Equivalence & Standards
1.4301 (EN Standard, Europe)
Equivalent Grades: ASTM 304 (USA, UNS S30400), GB 06Cr19Ni10 (China, new standard).
Standard: EN 10088-2 (for plates, bars, etc.).
Composition: C ≤0.07%, Cr 17.5–19.5%, Ni 8.0–10.5%.
Properties: Austenitic stainless steel with excellent corrosion resistance and weldability, widely used in food machinery, architectural decoration, etc.
STS304 (KS Standard, South Korea)
Equivalent Grades: JIS SUS304 (Japan), ASTM 304 (USA).
Standard: KS D 3503 (for stainless steel bars, wires).
Composition: C ≤0.08%, Cr 18.0–20.0%, Ni 8.0–10.5%.
Properties: Highly similar to 1.4301, with a slightly higher Cr upper limit for better high-temperature oxidation resistance.
2. 1.4301 stainless steel vs. STS304 Chemical Composition Comparison
| Element | 1.4301 (EN 10088-2) | STS304 (KS D 3503) |
|---|---|---|
| Carbon (C) | ≤0.07% | ≤0.08% |
| Chromium (Cr) | 17.5–19.5% | 18.0–20.0% |
| Nickel (Ni) | 8.0–10.5% | 8.0–10.5% |
| Silicon (Si) | ≤1.0% | ≤1.0% |
| Phosphorus (P)/Sulfur (S) | ≤0.045% / ≤0.030% | ≤0.045% / ≤0.030% |
3. 1.4301 stainless steel vs. STS304 Mechanical Properties & Workability
| Property | 1.4301 | STS304 |
|---|---|---|
| Tensile Strength | 520–720 MPa | ≥520 MPa |
| Yield Strength | ≥210 MPa | ≥205 MPa |
| Elongation | ≥45% | ≥40% |
| Work Hardening Rate | Low (excellent deep drawing) | Low (excellent deep drawing) |
| Weldability | Excellent, no post-weld heat treatment needed | Good, but monitor intergranular corrosion risk |
4. 1.4301 stainless steel vs. STS304 Corrosion Resistance & Application Scenarios
| Environment | 1.4301 | STS304 |
|---|---|---|
| Atmospheric/Water | Excellent | Excellent |
| Mild Acid/Alkali | Good (short-term resistance) | Good (short-term resistance) |
| High-Temperature Oxidation (>600°C) | Moderate | Moderate to Slightly Better |
| Intergranular Corrosion Risk | Low (C ≤0.07%) | Moderate (C ≤0.08%) |
1.4301 stainless steel vs. STS304：Scenario-Based Interchangeability:
Interchangeable: Non-welded, room-temperature applications (e.g., architectural parts, cold-formed components).
Non-Interchangeable:
Welded structures (food machinery, chemical equipment).
High-temperature (>600°C) or strongly oxidizing media (e.g., concentrated sulfuric acid).
Export projects requiring compliance with EN 10088-2 or KS D 3503.
5.Procurement Decision Flowchart
Procurement Requirement → Confirm Application Scenario → Evaluate Standard Compliance → Analyze Chemical Composition → Verify Mechanical Properties → Audit Supplier Qualifications → Balance Cost & Lead Time → Final Decision
Standard Compliance: Use 1.4301 for exports to Europe; accept STS304 for South Korea.
Performance Verification: Require chemical composition reports (especially C content) and mechanical test data from suppliers.
Supplier Selection: Prefer suppliers certified to both EN 10088-2 and KS D 3503 to minimize interchangeability risks.
Conclusion: When to Interchange?
| Condition | Recommended Interchange | Not Recommended |
|---|---|---|
| Non-welded, Room-Temperature | Yes | No |
| EN 10088-2 Compliance | No | Yes |
| KS D 3503 Compliance | Yes | No |
| Welded Structures | No | Yes |
| High-Temperature Oxidation | No | Yes |
