x5crni18-10 VS. AISI 304
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Comparative Analysis of X5CrNi18-10 and AISI 304
X5CrNi18-10 and AISI 304 refer to the same austenitic stainless steel grade under different standard systems. They have highly similar chemical compositions and properties, with the main differences lying in their origin of standards and designation formats. Below is a detailed technical comparison:
1. X5CrNi18-10 Standards
| Item | X5CrNi18-10 | AISI 304 |
|---|---|---|
| Standard System | European Standard (EN 10088-2:2005) | American Standard (ASTM A240 / AISI SAE) |
| Corresponding Numeric Grade | EN 1.4301 (former designation X5CrNi18-10) | UNS S30400 |
| Equivalence | Fully equivalent to AISI 304 in composition and properties | Fully interchangeable with X5CrNi18-10 |
2. X5CrNi18-10 Chemical Composition (Key Elements, %)
| Element | X5CrNi18-10 (EN 10088) | AISI 304 (ASTM A240) |
|---|---|---|
| C | ≤0.07 | ≤0.08 |
| Cr | 17.5–19.5 | 18.0–20.0 |
| Ni | 8.0–10.5 | 8.0–11.0 |
| Others | Mn ≤2.0, Si ≤1.0, P ≤0.045, S ≤0.030 | Mn ≤2.0, Si ≤0.75, P ≤0.045, S ≤0.030 |
3. X5CrNi18-10 Mechanical Properties (Solution Annealed Condition)
| Property | Value | Notes |
|---|---|---|
| Tensile Strength | ≥500 MPa | Typical for austenitic stainless steels; excellent ductility with elongation ≥40%. |
| Yield Strength (0.2% Offset) | ≥210 MPa | Nearly identical at room temperature; suitable for bending and stretching applications (e.g., cookware, fittings). |
| Hardness | ≤200 HB | Low hardness, easy to process via cutting, welding, etc. |
| High-Temperature Resistance | Max continuous service temperature around 800°C | Oxidation resistance is comparable; for prolonged use, temperatures should ideally stay below 650°C to prevent intergranular corrosion (stabilization treatment recommended). |
4. X5CrNi18-10 Corrosion Resistance
General Corrosion:
Both grades show excellent resistance to atmospheric conditions, water, and neutral solutions (such as brine), with equivalent corrosion resistance.
Intergranular Corrosion:
Without stabilization treatment, exposure to the sensitization temperature range (450–850°C) may cause chromium carbide precipitation and intergranular corrosion. This can be mitigated by using low-carbon versions (304L/X2CrNi18-9) or titanium/niobium-stabilized grades (such as 321 stainless steel).
Application Scenarios:
Fully interchangeable in food processing (compliant with FDA/EC 1935/2004), architectural decoration (e.g., curtain walls, railings), medical devices, and chemical equipment (for non-severe corrosive environments).
5. X5CrNi18-10 Workability and Weldability
Formability:
Excellent cold forming properties, capable of being bent, stamped, and formed into complex shapes (e.g., sinks, pipe fittings). Moderate work hardening rate.
Weldability:
Suitable for TIG, MIG, and other common welding processes. Using 308 series filler metal is recommended. Post-weld heat treatment is generally unnecessary unless thickness exceeds 3mm or the application requires high corrosion resistance (in which case solution annealing is advised).
6. Key Differences and Practical Selection Advice
| Aspect | X5CrNi18-10 | AISI 304 | Selection Advice |
|---|---|---|---|
| Compliance | Suitable for Europe and China (GB/T 24511 adopts EN standards) | Suitable for North America and Japan/South Korea (JIS SUS304 equivalent) | Select grade based on project location and applicable standards. For European markets, specify EN 1.4301/X5CrNi18-10. |
| Naming Convention | European format: "X + carbon content + main element percentages" | American format: "AISI + numeric designation" |
