253MA, UNS S30815, W.Nr. 1.4835
Note that the designation “ 253MA®” is registered trademarks of the Outokumpu.
253MA is a grade combining excellent service properties at high temperatures with ease of fabrication. It resists oxidation at temperatures up to 1150°C and can provide superior service to grade 310 in carbon, nitrogen and sulphur containing atmospheres. Compared to high nickel alloys and to grade 310, 253MA contains fairly low nickel content, which gives it some advantage in reducing sulphide atmospheres. Also, the inclusion of high silicon, nitrogen and cerium contents gives the steel good oxide stability, elevated temperature strength and excellent resistance to sigma phase precipitation.The austenitic structure gives this grade excellent toughness, even down to cryogenic temperatures.
| Material | Cr | Mo | Si | Ni | S | C | Mn | Ce |
|---|---|---|---|---|---|---|---|---|
| 253MA | 20.0-22.0 | 10.0-12.0 | 1.40-2.00 | 0.14-0.20 | 0.03 max | 0.05-0.10 | 0.80 max | 0.03-0.08 |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| 253MA | 600 N/mm² | 310 N/mm² | 40% | 90-217 |
253MA stainless steel offers excellent resistance to high temperature corrosion. Although, the material is not designed for aqueous corrosion resistance the high chromium and nitrogen contents give the grade a pitting resistance approximating that of 316. However, 253MA material have a high carbon content so is highly susceptible to sensitisation from welding or service exposure, this is likely to reduce aqueous corrosion resistance after high temperature service or fabrication, its not intended for applications exposed to wet corrosion.
Heat to 1050-1150°C and cool rapidly. It is recommended that the material be solution treated after 10-20% cold work to achieve maximum creep strength in service. 253MA cannot be hardened by thermal treatment.
Heating of 253MA stainless steel is commonly performed for heat treatment purposes. The process involves heating the material to specific temperatures and holding it for a certain duration in controlled atmospheres, and air cooling or quenching, to prevent oxidation and achieve desired mechanical propertie, improve strength and hardness. Post-treatment processes may be necessary to meet the final product specifications.
Pickling is a common process used to remove surface impurities and oxide layers from 253MA material. It involves immersing the material in a pickling solution, typically an acid-based solution, to dissolve contaminants and restore the material's corrosion resistance.
253MA can be formed using both hot and cold forming processes, depending on the desired shape, complexity, and mechanical properties required for the application.
Hot Forming: 253MA exhibits good hot workability, allowing it to be easily formed by employed the common hot forming methods such as hot rolling, hot forging, and hot extrusion. The specific temperature range for hot forming can vary depending on the desired deformation and the requirements of the application. Hot forming is typically used for larger and more complex components that require extensive shaping.
Cold Forming: 253MA retains its good ductility and formability even at lower temperatures, allowing it to be easily formed by employed the common cold forming methods such as cold rolling, cold drawing, bending, and deep drawing. Cold forming is often preferred for smaller, simpler components or those that require high dimensional accuracy and surface finish. Also, It improves the strength and hardness of this material due to work hardening during the process.
Same as other austenitic stainless steels, the machining of 253MA material requires sharp tools, slow speeds and heavy feeds.
253MA stainless steel provides excellent weldability and supports all standard fusion methods. When matching filler metals is required, consider 22.12HT rods or electrodes. If lower creep strength can be tolerated, grade 309 fillers can be used.
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