Stainless Steel 300 Series Grades

ALLOY / UNS	DESCRIPTION	C MAX	NI	CR	MN	OTHER	DENSITY
301 S30100	Chromium nickel steel capable of attaining high tensile strength and ductility by moderate or severe cold working.	0.15	6.0-8.0	16.0-18.0	18.0 2.0 Max	P .045 Max S .03 Max Si 1.0 Max	0.29
301LN S30153	301LN is a higher nitrogen content version of 301L to compensate for the lower carbon.	0.03	6.0-8.0	16.5-18.5	2.0 Max	P .045 Max S .03 Max S 1.0 Max	0.29
303 S30300	Free machining grade (sulfur added) with good machinability, corrosion resistance and strength.	0.15	8.0-10.0	17.0-19.0	2.0 Max	P .20 Max Si 1.0 Max S .15 Min	0.282
304 S30400	Low carbon chromium nickel stainless and heat resisting steel somewhat superior to Type 302 in corrosion resistance.	0.08	8.0-10.5	18.0-20.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max	0.29
304H S30409	Controlled carbon grade of 304 for increased strength at operating temperatures above 800 degrees Fahrenheit.	.04-1.0	8.0-10.5	18.0-20.0	2.0 Max	P .04 Max Si 1.0 Max S .03 Max	.285
304L S30403	Very low carbon chromium nickel steel with general corrosion resistance similar to Type 304 but with superior resistance to intergranular corrosion following welding or stress relieving.	.03	8.0-12.0	18.0-20.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max	.29
309 S30900	High corrosion-resistant, chromium nickel grade with carbon limited to .08	.08	12.0-15.0	22.0-24.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max	.29
309S S30908	Controlled carbon version of 309. 309S maintains corrosion resistance at higher operating temperatures.	.08	12.0-15.0	22.0-24.0	2.0 Max	P .045 Max Si 1.0 Max S .03 Max	.29
310 S31000	Similar to 309 with higher resistance to corrosion and oxidation at elevated temperatures.	.25	19.0-22.0	24.0-26.0	2.0 Max	P .045 Max S .03 Max Si 1.50 Max	.29
310S S31008	Maintains good strength and corrosion resistance at higher operating temperatures.	.08	19.0-22	24.00-26.00	2.0 Max	P .045 Max S .030 Max Si 1.50 Max	.29
316 S31600	Chromium nickel stainless and heat resisting steel with superior corrosion resistance to other chromium nickel steels when exposed to many types of chemical corrodents; superior creep strength at elevated temperatures.	.08	10.0-14.0	16.0-18.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max Mo 2.0-3.0	.29
316L S31603	Low carbon chromium nickel stainless steel with general corrosion resistance similar to Type 316 but with superior resistance to intergranular corrosion following welding or relieving. It is recommended for use in parts which are fabricated by welding and cannot be subsequently annealed.	.03	10.0-14.0	16.0-18.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max Mo 2.0-3.0	.29
321 S32100	Chromium nickel steel containing titanium. Recommended for parts fabricated by welding which cannot be subsequently annealed. Also recommended for parts to be used at temperatures between 800°F and 1850°F.	.08	9.0-12.0	17.0-19.0	2.0 Max	P .045 Max S .03 Max Si 1.0 Max Ti 5xC Min	.29