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AISI TYPE	CHARACTERISTICS	TYPICAL APPLICATIONS
AUSTENTIC
304	General purpose stainless steel specially for welded construction	For welded construction or wall vessels formed in a number of draws.
321 environ-	Stabilized 18/8 type with titanium; Not sensitive to intergranular corrosion within the carbide precipitation range of 420 to 870^o C, corrosion resistance comparable to 304.	Used in Oxidising corrosive ments, within 420 to 870^o for welded construction. No annealing required after welding.
316	High creep strength, superior corrosion resisting properties in reducing atmosphere.	Used in industries in such medias as Sulphurous acid, Sulphuric acid, Phosphoric acid, formic acids & various organic acids for better corrosion resistance than 18/8 type.
310	Excellent high temperature properties with good ductility & weldability.	Used up to 1150 ^o C for continuous service & 1050 for intermittent service in oxidising atmosphere.
FERRITIC
430	Good Combination of corrosion resistance, useful mechanical properties & good formability. Not hardenable by heat treatment.	Utensils, hardwares, fasteners, appliances, furnace parts, Nitric acid processing equipments etc.
MARTENSETIC
410	General purpose corrosion & heat resisting steel; gives maximum corrosion resistance after heat treatment. Hardenable by heat treatment.	Cutlery, shafts, cracking tower, bubbler caps & trays for oil & gas industry, beater bars for paper & pulp industries etc.
* Austenitic stainless steels are not hardenable by heat treatment. These can be hardened by cold work only.

AISI TYPE	C	Si	Mn	P	S	Ni	Cr.	Mo
Austentic St. Steel
303	0.15	1.00	2.00	0.20	0.15	8.00 10.00	17.00 19.00
304	0.06	1.00	20.00	0.045	0.030	8.00 10.00	18.00 20.00
304L	0.03	1.00	2.00	0.045	0.030	11	18
316	0.07	1.00	2.00	0.045	0.030	11	18	2.00 3.00
318L	0.03	1.00	2.00	0.045	0.030	13	18	2.00 3.00
317	0.06	1.00	2.00	0.045	0.030	13	18	3.00 4.00
317L	0.03	0.50	1.75	0.045	0.030	14	19	3.00 3.00
321	0.08	1.00	2.00	0.45	0.030	11	18
325	0.25	2.00	0.60	0.045	0.030	19.00 23.00	10
347	0.08	1.00	2.00	0.045	0.030	11	15
Heat Resisting Steel
309	0.20	1.00	2.00	0.045	0.030	12.00 15.00	22.00 24.00
310	0.25	1.50	2.00	0.045	0.030	19.00 22.00	24.00 26.00
Ferritic St. Steel
405	0.08as	1.00	1.00	0.045	0.030	-	11.50 14.50
Martensetic St. Steel
410	0.12	1.00	1.00	0.040	0.030	-	12.5
416A	0.12	1.00	1.25	0.060	0.15	-	12.5
420	0.23	1.00	1.00	0.040	0.030	-	12.5
431	0.20	1.00	1.00	0.040	0.030	2.00	16.00

Stainless Steel Grade Designation	Condition Temper	UTS N/mm² Min.	0.2% Proof Stress N/mm² Min.	% Elongation on 50 mm GL Min.	Hardness RB Max.
SS 201	Annealed	655	310	40	-
	1/4 hard	860	515	20	-
	1/2 hard	1025	760	-	-
	3/4 hard	1205	930	-	-
	Full Hard	1275	965	-	-
SS202	Annealed	620	310	40	-
	1/4 hard	860	515	12	-
SS301	Annealed	515	205	40	88
	1/4 hard	860	515	25	-
	1/2 hard	1025	760	-	-
	3/4 hard	1205	930	-	-
	Full Hard	1275	965	-	-
SS302	Annealed	515	205	40	88
SS304	Annealed	515	205	40	88
SS304L	Annealed	485	170	40	88
SS309	Annealed	515	205	40	95
SS309S	Annealed	515	205	40	95
SS310	Annealed	515	205	40	95
SS310S	Annealed	515	205	40	95
SS316	Annealed	515	205	40	95
SS316L	Annealed	485	170	40	95
SS321	Annealed	515	205	40	88
SS347	Annealed	515	205	40	88
SS409	Annealed	415	205	22	80
SS430	Annealed	450	205	22	88
SS410	Annealed	450	205	22	95

AISI TYPE	Condition	UTS Kg/mm² Min.	YS (0.2%offset) ~ Min. Kg/mm²	% EL in 50 mm Min.	Hardness RB Max.
AUSTENITIC
201	Annealed	67.0	31.5	40.0	-
202	Annealed	63.5	31.5	40.0	-
301	Annealed	53.0	21.0	40.0	94
302	Annealed	53.0	21.0	40.0	94
304	Annealed	53.0	21.0	40.0	94
304L	Annealed	49.0	17.5	40.0	94
309	Annealed	53.0	21.0	40.0	96
310	Annealed	53.0	21.0	40.0	96
316	Annealed	53.0	21.0	40.0	96
316L	Annealed	49.0	17.5	40.0	96
317	Annealed	53.0	21.5	40.0	96
321	Annealed	53.0	21.5	40.0	94
347	Annealed	53.0	21.5	40.0	94
FERRITIC
430	Annealed	45.5	21.0	22.0	94
446	Annealed	53.0	28.0	20.0	95
MARTENSITIC
403	Annealed	45.5	21.0	20.0	94
410	Annealed	45.5	21.0	22.0	88