The Stainless Steel Material Grade Chemical Composition

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Martensitic, Ferritic, Austenitic and Duplex are four groups of Stainless Steel. The composition of stainless steel initial starts withchromium. once steel is combined with 10.5% chromium the resultant alloy isclassed as "stainless steel". when chromium is added to steel, oxygen creates a stable chemical compound surface film. This protects the surface ofthe steel metal from physical or chemical changes.

The list below makes a big comparison composition table for Stainless Steel Grades.

Grade and Main chemical composition%
	C	Si	Mn	P≤	S≤	Cr	Mo	Ni	Other
SUS201	≤0.15	≤1.00	5.5-7.5	0.06	0.03	16-18	-	3.5-5.5	N≤0.25
SUS202	≤0.15	≤1.00	7.5-10.0	0.06	0.03	17-19	-	4.0-6.0	N≤0.25
SUS301	≤0.15	≤1.00	≤2.00	0.045	0.03	16-18	-	6.0-8.0	-
SUS302	≤0.15	≤1.00	≤2.00	0.045	0.03	17-19	-	8-10.0	-
SUS303	≤0.15	≤1.00	≤2.00	0.2	≥0.015	17-19	≤0.6	8.0-10.0	-
SUS304	≤0.08	≤1.00	≤2.00	0.045	0.03	18-20	-	8-10.5	-
SUS304L	≤0.03	≤1.00	≤2.00	0.045	0.03	18-20	-	9-13	-
SUS305	≤0.12	≤1.00	≤2.00	0.045	0.03	17-19	-	10.5-13	-
SUS309S	≤0.08	≤1.00	≤2.00	0.045	0.03	22-24	-	12-15	-
SUS310S	≤0.08	≤1.5	≤2.00	0.045	0.03	24-26	-	19-22	-
SUS316	≤0.08	≤1.00	≤2.00	0.045	0.03	16-18	2-3	10-14	-
SUS316L	≤0.03	≤1.00	≤2.00	0.045	0.03	16-18	2-3	12-15	-
SUS317	≤0.08	≤1.00	≤2.00	0.045	0.03	18-20	3-4	11-15	-
SUS317L	≤0.03	≤1.00	≤2.00	0.045	0.03	18-20	3-4	11-15	-
SUS321	≤0.08	≤1.00	≤2.00	0.045	0.03	17-19	-	9-13	Ti≥5×C
SUS405	≤0.08	≤1.00	≤1.00	0.04	0.03	11.5-14.5	-	≤0.6	AL0.1-0.3
SUS420F	0.26-0.4	≤1.00	≤1.25	0.06	≥0.15	12-14	≤0.6	≤0.6	-
SUS430	≤0.12	≤0.75	≤1.00	0.04	0.03	16-18	-	≤0.6

We’ve compiled in depth info concerning stainless-steel grades and the way they compare with each other. we tend to hope this helps you create associate informed decision once choosing stainless-steel for your application.