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Stainless Steel - Grade 253MA (UNS S30815)

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Stainless Steel - Grade 253MA (UNS S30815)

Stainless Steel Grade 253MA introduction

 

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.Another proprietary designation covering this grade is 2111HTR.

253MA contains fairly low nickel content, which gives it some advantage in reducing sulphide atmospheres when compared to high nickel alloys and to Grade 310. The inclusion of high silicon, nitrogen and cerium contents gives the steel good oxide stability, high elevated temperature strength and excellent resistance to sigma phase precipitation.The austenitic structure gives this grade excellent toughness, even down to cryogenic temperatures.

In what type of applications is 253 MA used?

*Burners, Boiler Nozzles

*Petrochemical and refinery tube hangers

*Heat exchangers

*Expansion bellow

*Stack dampers

*Applications

Typical applications include:

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.

Mechanical Properties

Room Temperatur

 

Specified Limits Minimum

Typical Range

 

Ultimate Tensile Strength, psi

87,000

90,000-114,000

 

2% Offset Yield Strength, psi

45,000

45,000-69,000

 

Elongation in 2", %

40

42-70

 

Reduction of Area, %

50

-

 

Hardness Rockwell B

-

Rb 90

 

Physical Properties

Typical physical properties for grade 253MA stainless steels are given in table 3.

Physical properties of 253MA grade stainless steel

Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (mm/m/°C)

Thermal Conductivity (W/m.K)

Specific Heat
0-100°C (J/kg.K)

Electrical Resistivity (nW.m)

0-100°C

0-600°C

0-1000°C

at 20°C

at 1000°C

7800

200

17.0

18.5

19.5

15.0

29.0

500

850

 

Grade Specification Comparison

Approximate grade comparisons for 253MA stainless steels are given in table 4.

Grade specifications for 253MA grade stainless steel

UNS No

Old British

Euronorm

Swedish

SS

Japanese

JIS

BS

En

No

Name

S30815

-

-

1.4835

X9CrNiSiNCe21-11-2

2368

 

 

Plate

Bar

Pipe Smls

Pipe Welded

A240, A480, A167

A276, A479

A213, A312

A312, A358, A409, A813, A814

ASTM Specifications

 

Heat Resistance

Oxidation - excellent resistance to air, at temperatures up to 1150°C. At high temperatures the steel quickly forms a thin, highly adherent and elastic oxide. This oxide gives good protection even under cyclic 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. Its strength at these temperatures is higher than that of alternatives such as Grade 310.

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.

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.

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