Stainless steel grade 253MA and Specification
Stainless steel grade 253MA and Specification
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253MA® is a trademark owned by Outokumpu Stainless AB. The standard grade designation covering this grade is UNS S30815. Other mills produce grades compliant with UNS S30815, including Sirius S15®.
253MA contains a fairly low nickel content, which gives it some advantage in reducing sulphide atmospheres when compared to high nickel alloys and Grade 310. The inclusion of high chromium, silicon, nitrogen and cerium contents gives the steel good oxide stability, high elevated temperature (creep) strength and excellent resistance to sigma phase precipitation.
The austenitic structure gives this grade excellent toughness, even down to cryogenic temperatures.
Stainless steel grade 253MA Corrosion Resistance
Although not designed for aqueous corrosion resistance, the high chromium and nitrogen contents give the grade a pitting resistance approximating that of 316. 253MA does however have a high carbon content so is highly susceptible to sensitisation; this is likely to reduce aqueous corrosion resistance after high temperature service or fabrication.
Consult Atlas Technical Assistance for specific environmental recommendations.
Stainless steel grade 253MA Heat Resistance
Oxidation - excellent resistance to air, at temperatures up to 1100°C. At temperatures the steel quickly forms a thin, highly adherent and elastic oxide. This gives good protection even under conditions, much better than is the case for Grade 310. Best resistance is under cycling conditions.
Carburisation - Under oxidising conditions this grade can perform well, but alloys with higher nickel content are preferred if the atmosphere is reducing.
Sulphidation - good resistance to sulphur- bearing gases in an oxidising atmosphere, even if only traces of oxygen are present. Reducing gases prevent the protective oxide forming.
253MA has high strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 500°C and up to about 900°C.
253MA will become sensitised in the temperature range of 425-860°C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.
Stainless steel grade 253MA Heat Treatment - Solution Treatment (Annealing)
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. This grade cannot be hardened by thermal treatment.
Stainless steel grade 253MA Welding
Excellent weldability by all standard fusion methods. AS 1554.6 pre-qualifies welding of S30815 with matching Grade 22.12HT rods or electrodes. Grade 309 fillers can be used if lower creep strength can be tolerated. Pure argon shielding gas should be used.
Stainless steel grade 253MA Machining
As for other austenitic stainless steels, the machining requires sharp tools, slow speeds and heavy feeds.
Stainless steel grade 253MA Typical Applications
Radiant tubes stainless steel - Source http://avion-europe.de/burner-systems.html
RECUPERATIVE BURNER RECUTECH use as radiant tube burner (metallic or fully ceramic radiant tube) for heat treatment plants with protective gas or other critical atmospheres
Furnace components including burners, retorts, conveyor belts, fans, jigs and baskets, rollers, walking beams, radiant tubes, electric heater elements, refractory anchors, hoods, flues, grates, expansion bellows. Petrochemical and refinery tube hangers.
Stainless steel grade 253MA Specified Properties
These properties are specified for flat rolled product (plate, sheet and coil) as Grade S30815 in ASTM A240/A240M. Similar but not necessarily identical properties are specified for S30815 in other products such as pipe and bar in their respective specifications, and for Grade 1.4835 in specifications such as EN 10095.
COLLECTION OF COMMON STAINLESS STEEL GRADE
Source:
http://www.atlassteels.co.nz/
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