ALLOY 254 STAINLESS STEEL

Alloy 254 SMO is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength. With high levels of chromium, molybdenum, and nitrogen, Alloy 254 SMO is frequently used in high chloride environments, such as brackish water, seawater, pulp mill bleach plants, and other chloride process streams. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.
 

Chemical Properties

%	C	Cr	Mn	Mo	N	Ni	P	Si	S
254 SMO	0.02 max	min: 19.5  max:20.0	1.00 max	min: 6.0  max: 6.5	min: 0.18  max: 0.20	min: 17.5  max: 18.0	0.03 max	0.80 max	1.01 max

 

Mechanical Properties

Grade	Tensile Strength ksi (MPa) min	Yield Strength 0.2% Offset ksi (MPa) min	Elongation - % in 50 mm (min.)	Hardness (Brinell) MAX	Hardness (Rockwell B) MAX
254 SMO Sheet & Strip	100 (690)	45 (310)	35	223	96
254 SMO Plate	95 (655)	45 (310)	35	223	96

 

254SMo	Standard
	Sheet/Plate			Round bar/Wire			Pipe				Tube
	ASTM A240			ASTM A276 ASTM A479			ASTM A269 ASTM A213 ASTM A312				ASTM A249 ASTM A269 ASTM A312 ASTM A358 ASTM A409

 

254 SMO is used in the following applications:

1)Equipment for handling of seawater, such as, seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.

2) Hydraulic and instrumention tubing

3) Equipment in pulp bleaching plants

4) Components in gas cleaning systems

5) Tanks and pipelines for chemicals with high halide contents