CHAMPAK INDUSTRIES STOCK 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.

Composition

Typical compositional ranges for grade 253MA stainless steels are given in table 1.

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	Japanese JIS
	BS	En	No	Name
S30815	–	–	1.4835	X9CrNiSiNCe21-11-2	2368	–

These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

Possible Alternative Grades to grade 253MA stainless steels are given

Composition ranges for 253MA grade stainless steel

C	Mn	Si	P		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

Typical mechanical properties for grade 253MA stainless steels are given

Mechanical properties of 253MA grade stainless steel

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