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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 870o C, corrosion resistance comparable to 304.
Used in Oxidising corrosive

ments, within 420 to 870o 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
 
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