Stainless Steel 253MA

 

UNS S30815
ASTM A 240, A 276, A 312
A 358, A 409, A 473, A 479
A 480, A 813, A 814

 

Forms of 253 MA Available
Sheet
Plate
Bar
Pipe
Welding Material: Bare Weld Wire, Coated Electrode and Spooled Weld Wire

 

 

253 MA Stainless Overview
Stainless 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.

 

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

 

 

 

Applications of 253 MA 

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

Stainless steel 253 MA is readily fabricated by standard commercial proced, ures. In comparison to 

carbon,  steel, stainless&n, bsp;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.