321 Stainless Steel Grade

 

Chemical Composition

SS 321 stainless steel chemical composition is listed in the following table based on cast analysis.

Chemical Composition, %
ASTM Type	AISI Type (UNS)	C, ≤	Si, ≤	Mn, ≤	P, ≤	S, ≤	Cr	Ni	N, ≤	Other Elements	Notes
ASTM A240/A240M	321 (UNS S32100)	0.08	0.75	2.00	0.045	0.03	17.0-19.0	9.0-12.0	0.10	≥ Ti 5×(C+N), ≤ 0.70	Plate, Sheet, and Strip for Pressure Vessels
ASTM A276A/276M			1.00						–		Stainless Steel Bars and Shapes
ASTM A580/A580M									–	≥ Ti 5×C	Stainless Steel Wire
ASTM A959									0.10	≥ Ti 5×(C+N), ≤ 0.70	Wrought Stainless Steels
ASTM A473									–	≥ Ti 5×C	Stainless Steel Forgings
ASTM A314									–	≥ Ti 5×(C+N), ≤ 0.70	Billets and bars for forging
ASTM A240/A240M	321H (UNS S32109)	0.04-0.10	0.75	2.00	0.045	0.03	17.0-19.0	9.0-12.0	0.10	≥ Ti 4x(C+N), ≤ 0.70	Plate, Sheet, and Strip
ASTM A959			1.00						0.10		Wrought Stainless Steels
ASTM A312/A312M	TP321 (UNS S32100)	0.08	1.00	2.00	0.045	0.03	17.0-19.0	9.0-12.0	0.10	≥ Ti 5×(C+N), ≤ 0.70	Stainless Steel Pipes
	TP321H (UNS S32109)	0.04-0.10	1.00	2.00	0.045	0.03	17.0-19.0	9.0-12.0	0.10	≥ Ti 4x(C+N), ≤ 0.70