253 MA®

An austenitic chromium-nickel-silicon grade, 253 MA® offers outstanding strength and unrivalled heat resistance.

253 MA® was developed over 30 years ago, when the need for a heat resistant stainless steel with high strength and good oxidation resistance was required in the industry.

Inventory

Product Form	Size Range From	Size Range To
253 MA® Pipe	0.5 in	4 in
253 MA® Round bar	12.7 mm	101.6 mm
253 MA® Sheet & plate	1.6 mm	50.8 mm
253 MA® Welding wire	1.6 mm	3.175 mm

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Chemical Analysis

%	Cr	Ni	Si	C	Mn	P	S	N	Ce	Fe
Min	20	10	1.40	0.05	-	-	-	0.14	0.03	Balance
Max	22	12	2	0.10	0.80	0.04	0.03	0.20	0.08	-

Applications

Perfect for applications in the Thermal Processing industry

253 MA® can be used in a variety of applications including:

Pyrolysis Vessels
Boiler Nozzles
Corrugated Boxes
Cyclones
Bar Baskets
Radiant Tubes
Combustion chambers

About 253 MA®

Despite its lean nickel content, 253 MA® alloy offers an outstanding combination of creep strength and high resistance to oxidation, sulphidation and erosion/abrasion at extremely high temperatures. This makes the alloy more economical than most heat resistant alloys.

The high heat resistant properties of 253 MA® are obtained by the tight control of micro alloy additions. Whilst the benefit of creep rupture strength is down to the combination of nitrogen, carbon and cerium, its superior oxidation resistance is a result of the combination of cerium and silicon.

253 MA® is the registered trademark of Outokumpu Stainless.

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Properties

Density:: 8 g/cm³
Melting Range:: 1371-1432 ⁰C
Poisson's Ratio:: 0.31

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Mechanical & Physical Properties
Mechanical Properties for 253 MA®

Mechanical & Physical Properties	21⁰C	93⁰C	204⁰C	316⁰C	427⁰C	538⁰C	593⁰C	649⁰C	704⁰C	760⁰C	816⁰C	871⁰C	927⁰C	982⁰C	1038⁰C	1093⁰C
Minimum Creep 0.0001% per hr (Ksi)	-	-	-	-	-	-	18.0	11.6	7.7	5.0	3.35	2.3	1.5	0.89	0.49	-
Minimum Creep 0.00001% per hr (Ksi)	-	-	-	-	-	-	12.0	8.2	5.7	3.8	2.55	1.75	1.15	0.55	-	-
1000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	32.0	23.0	16.0	9.2	6.6	4.4	2.8	1.85	1.35	1.03
10,000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	22.0	14.0	8.5	5.2	3.75	2.5	1.65	1.15	0.86	0.68
100,000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	15.0	8.7	4.6	2.9	2.1	1.45	0.97	0.7	-	-
Coefficient of Thermal Expansion /µm/m⁰C	-	16.31	16.81	17.26	17.66	17.95	-	18.25	-	18.54	-	18.9	-	19.44	-	-
Thermal Conductivity /kcal/(hr.m.°C)	12.5	-	15	-	17.4	-	-	19.3	-	20.8	-	-	-	24.7	-	-
Modulus of Elasticity/ 10⁵MPa	2	-	1.85	-	1.68	-	-	1.5	-	1.39	-	1.29	-	1.21	-	-

Mechanical Properties	50⁰C	100⁰C	200⁰C	300⁰C	400⁰C	500⁰C	600⁰C	700⁰C	800⁰C	850⁰C	900⁰C
Ultimate Tensile Strength/ MPa	663.3	621.9	577.8	568.1	549.5	522	475.7	386.1	388.9	254.4	171
0.2% Yield Strength / MPa	304.8	271	222	202	200.6	173.1	166.9	158.6	148.2	100.7	80
Reduction of area / %	51	48	46	46	46	44	43	44	-	-	-
Elongation / %	68	65	65	64	60	62	63	58	76	88	92

Mechanical & Physical Properties

Mechanical & Physical Properties	21⁰C	93⁰C	204⁰C	316⁰C	427⁰C	538⁰C	593⁰C	649⁰C	704⁰C	760⁰C	816⁰C	871⁰C	927⁰C	982⁰C	1038⁰C	1093⁰C
Minimum Creep 0.0001% per hr (Ksi)	-	-	-	-	-	-	18.0	11.6	7.7	5.0	3.35	2.3	1.5	0.89	0.49	-
Minimum Creep 0.00001% per hr (Ksi)	-	-	-	-	-	-	12.0	8.2	5.7	3.8	2.55	1.75	1.15	0.55	-	-
1000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	32.0	23.0	16.0	9.2	6.6	4.4	2.8	1.85	1.35	1.03
10,000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	22.0	14.0	8.5	5.2	3.75	2.5	1.65	1.15	0.86	0.68
100,000 hr Rupture Strength (Ksi)	-	-	-	-	-	-	15.0	8.7	4.6	2.9	2.1	1.45	0.97	0.7	-	-
Coefficient of Thermal Expansion /µm/m⁰C	-	16.31	16.81	17.26	17.66	17.95	-	18.25	-	18.54	-	18.9	-	19.44	-	-
Thermal Conductivity /kcal/(hr.m.°C)	12.5	-	15	-	17.4	-	-	19.3	-	20.8	-	-	-	24.7	-	-
Modulus of Elasticity/ 10⁵MPa	2	-	1.85	-	1.68	-	-	1.5	-	1.39	-	1.29	-	1.21	-	-

Mechanical Properties for 253 MA®

Mechanical Properties	50⁰C	100⁰C	200⁰C	300⁰C	400⁰C	500⁰C	600⁰C	700⁰C	800⁰C	850⁰C	900⁰C
Ultimate Tensile Strength/ MPa	663.3	621.9	577.8	568.1	549.5	522	475.7	386.1	388.9	254.4	171
0.2% Yield Strength / MPa	304.8	271	222	202	200.6	173.1	166.9	158.6	148.2	100.7	80
Reduction of area / %	51	48	46	46	46	44	43	44	-	-	-
Elongation / %	68	65	65	64	60	62	63	58	76	88	92

Specifications

UNS Number:: S30815
Werkstoff Number:: 1.4835
Standards:: ASTM A182, A240, A276, A312, A479

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