253ma

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Description

253MA, UNS S30815, 1.4835, SUS310, SUS310S

 

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.

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®. 253 MA contains a fairly low nickel content,

which gives it some advantage in reducing sulphide atmospheres when compared to high

nickel alloys and SS310. 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.

 

Composition

  C Mn Si P S Cr Ni N Ce
min. 0.05 1.10 20.0 10.0 0.14 0.03
max. 0.10 0.80 2.00 0.040 0.030 22.0 12.0 0.20 0.08

 

Mechanical Properties

Tensile Str (MPa) min Yield Str 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
600 310 40 95 217

 

 

 

 

 

 

 

 

Corrosion Resistance of s30815, 1.4835

Although not designed for aqueous corrosion resistance, the high chromium and nitrogen

contents give the grade a pitting resistance approximating that of SUS316. 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.

 

Heat Resistance of 253ma , sus310

Oxidation – excellent resistance to air, at temperatures up to 1100°C. At high temperatures the steel quickly forms a thin, highly adherent and elastic oxide. This oxide gives good protection even under cyclic conditions, much better than is the case for SUS310. Best resistance is under noncycling 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 sulphurbearing 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. 253 MA 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.

 

Heat Treatment of stainless steel

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.

 

Welding

Excellent weldability by all standard fusion methods. AS 1554.6 pre-qualifies welding of

S30815 with matching Grade 22.12HT rods or electrodes. SUS309 fillers can be used if lower creep strength can be tolerated. Pure argon shielding gas should be used.

 

Machining

As for other austenitic stainless steels, the machining requires sharp tools, slow speeds

and heavy feeds.

 

Applications of 253 ma

Furnace components including burners, retorts, conveyor belts, fans, jigs and baskets, rollers,walking beams, radiant tubes, electric heaterelements, refractory anchors, hoods, flues,grates, expansion bellows. Petrochemical and refinery tube hangers.

 

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.