253MA Stainless Steel
253MA is a heat resistant austenitic stainless steel containing 20.0% to 22.0% chromium, 10.0% to 12.0% nickel, 1.40% to 2.00% silicon, 0.14% to 0.20% nitrogen, and rare earth additions such as cerium. The source describes oxidation resistance, creep resistance, and high temperature strength from 850℃ to 1100℃, with scaling beginning at 1150℃. It also resists corrosion and erosion in several gas media and provides weldability, formability, and machinability as an economical alternative to some nickel based alloys.
Product details
Chemical composition
| 253MA | C | Si | Mn | P | S | Ni | Cr | N | Ce |
|---|---|---|---|---|---|---|---|---|---|
| min | 0.05 | 1.4 | – | – | – | 10.0 | 20.0 | 0.14 | 0.03 |
| max | 0.1 | 2.0 | 0.8 | 0.04 | 0.03 | 12.0 | 22.0 | 0.2 | 0.08 |
Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| 253MA F45 | S30815 | 1.4835 | – | 1Cr21Ni11Si2NCe | X7CrNiSiNCe21-11 X9CrNiSiNCe21-11-2 |
Physical properties
| Density g/cm³ | 7.85 |
|---|---|
| Melting range ℃ | 1370-1420 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 15-20 |
| Specific heat J/kg•℃ | 500 |
| Elastic modulus GPa | 200 |
| Electrical resistivity μΩ•m | 0.78 |
| Linear expansion coefficient a/10-6℃-1 | 11.5-12.5 |
Mechanical properties
| Tensile strength Rm N/mm | ≥650 |
|---|---|
| Yield strength RP0.2 N/mm | ≥420 |
| Elongation % | ≥40 |
| Hardness HB | 180-230 |
| *After solution heat treatment | |
Available product forms
- Round Bar
- Plate
- Pipe & Tube
- Welding Consumables
- Flanges
- Hex Bolts
- Threaded Rod
- Nuts & Washers
Technical values are transcribed and translated from the supplied Milike Chinese catalogue. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
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