Austenitic · Stainless Steel
321 Titanium-stabilised Austenitic Stainless Steel
Chemical composition and mechanical properties to ASTM A240; available sizes are standard ranges.
① Chemical composition (ASTM A240, %)
| Element | Range |
|---|---|
| C | ≤0.08 |
| Si | ≤0.75 |
| Mn | ≤2.00 |
| P | ≤0.045 |
| S | ≤0.030 |
| Cr | 17.0–19.0 |
| Ni | 9.0–12.0 |
| Ti | 5×C–0.70 |
② Mechanical properties (ASTM A240)
| Property | Requirement |
|---|---|
| Tensile strength Rm | ≥ 515 MPa |
| Yield strength Rp0.2 | ≥ 205 MPa |
| Elongation A | ≥ 40% |
| Hardness | ≤ 217 HBW |
③ Available sizes (standard range)
- Thickness: 0.5–40 mm
- Width: ≤ 2000 mm
- Form: coil / sheet / plate / circle / slit strip on request
- Surface: 2B · BA · No.1 · No.4 · HL · 8K on request
④ Applicable standards
ASTM A240 · EN 10088-2 · GB/T 4237
⑤ Typical applications
High-temperature piping, boilers, heat exchangers, exhaust systems, parts in 450–900 °C continuous service
⑥ Substitution and selection advice
Titanium stabilisation resists sensitisation, making it suitable for 450–900 °C. Ambient corrosion resistance is close to 304; welded assemblies outperform 304.
Chemical and mechanical data quoted from the public ASTM A240 standard. Available sizes are standard ranges; the contract and technical agreement prevail.