253MA S31805 1.4835

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253MA S31805 1.4835

253 MA is a lean austenitic heat resistant alloy with high strength and outstanding oxidation resistance. 253 MA maintains its heat resistant properties by advanced control of micro alloy additions. The use of rare earth metals in combination with silicon gives superior oxidation resistance up to 2000°F. Nitrogen, carbon and a dispersion of rare earth and alkali metal oxides combine to provide creep rupture strength comparable to the nickel base alloys. A wide variety of components requiring high strength at elevated temperatures such as heat exchangers, kilns, stack dampers and oven components are common applications for 253 MA.

Equivalent designations

UNS S30815

DIN W. Nr. 1.4835

Form	ASTM
Rod, bar and shape	A 276, A 484
Plate, sheet and strip	A 240, A 480
Seamless and welded pipe	A 312, A 999
Welded pipe	A 814, A 999
Seamless and welded tubing	A 269, A 1016
Fitting	A 403, A 960
Forged or rolled pipe flange and forged fitting	A 182, A 961
Forging	A 473, A 484

Chemical Composition, %

Cr	Ni	C	Si	Mn
20.0-22.0	10.0-12.0	0.05-0.10	1.40-2.00	0.80 Max
P	S	N	Ce	Fe
0.040 Max	0.030 Max	0.14-0.20	0.03-0.08	Balance

Some characteristics of 253 MA
Excellent oxidation resistance to 2000°F
High creep-rupture strength
In what type of applications is 253 MA used?
Burners, Boiler Nozzles
Petrochemical and refinery tube hangers
Heat exchangers
Expansion bellow
Stack dampers

Mechanical Properties Room Temperature

	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

Fabrication and Welding with Stainless 253 MA
253 MA Stainless steel is readily fabricated by standard commercial procedures. In comparison to carbon steel, stainless steels are tougher and tend to work harden rapidly. However, with positive feeds and slow speeds combined with abundant cutting fluid this alloys tendency to work harden may be minimized.
Stainless 253 MA can be welded using conventional welding processes. Filler metal should be of similar composition for maximum weld integrity and properties.

ASTM Specifications

Plate	Bar	Pipe Smls	Pipe Welded
A240, A480, A167	A276, A479	A213, A312	A312, A358, A409, A813, A814

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