Grade UNS No. Chemical analysis % specified
C               Si             Mn              P                S                 Cr                 Mo                  Ni                       Other
Austenitic stainless steels
253MA S30815 0.05
-0.10		 1.1 – 2.0 0.8 0.04 0.03 20.0 – 22.0 10.0 – 12.0 N 0.14-0.20
Ce 0.03-0.08
301 S30100 0.15 0.75 2 0.045 0.03 16.0 – 18.0 6.0 – 8.0 N 0.10
302HQ S30430 0.03 1 2 0.045 0.03 17.0 – 19.0 8.0 – 10.0 Cu 3.0-4.0
303 S30300 0.15 1 2 0.2 0.15 17.0 – 19.0 8.0 – 10.0
304 S30400 0.08 0.75 2 0.045 0.03 18.0 – 20.0 8.0 – 10.5 N 0.10
304L S30403 0.03 1 2 0.045 0.03 18.0 – 20.0 8.0 – 12.0 N 0.10
304H S30409 0.04 – 01. 0 0.75 2 0.045 0.03 18.0 – 20.0 8.0 – 10.5 N 0.10
309S S30908 0.08 1 2 0.045 0.03 22.0 – 24.0 12.0 – 15.0
310 S31000 0.25 1.5 2 0.045 0.03 24.0 – 26.0 19.0 – 22.0
316 S31600 0.08 0.75 2 0.045 0.03 16.0 – 18.0 2.0 – 3.0 10.0 – 14.0 N 0.10
316L S31603 0.03 0.75 2 0.045 0.03 16.0 – 18.0 2.0 – 3.0 10.0 – 14.0 N 0.10
317L S31703 0.03 0.75 2 0.045 0.03 18.0 – 20.0 3.0 – 4.0 11.0 – 15.0 N 0.10
321 S32100 0.08 0.75 2 0.045 0.03 17.0 – 19.0 9.0 – 12.0 N 0.10
Ti=5x(C+N) min.
0.70  max.
347 S34700 0.08 0.75 2 0.045 0.03 17.0 – 19.0 9.0 – 13.0 Nb 10xC min. 1.0
1.0 max.
904L N08904 0.02 1 2 0.045 0.035 19.0 – 23.0 4.0 – 5.0 23.0 – 28.0 Cu 1.0-2.0
Grade UNS No. Mechanical  properties specified (Note  4)
Common form Treatment Tensile strength MPa (min.) Yield strength (0.2% offset) MPa (min.) Elongation
% in 50mm
(min.)		 Hardness (max) (Note 2)
Austenitic stainless steels
253MA S30815 Plate Annealed 600 310 40 95 HRB
301 S30100 Sheet or coil Annealed
1/4 to full hard		 515
860 – 1275		 205
515 – 965		 40
25 – 9		 95 HRB
302HQ S30430 Wire
2.5mm  dia. and over		 Annealed
Lightly drawn		 605 max.
660 max.		 – – –
303 S30300 Bar Cold finished
Condition  A		 262 HB
304 S30400 Plate Annealed 515 205 40 92 HRB
304L S30403 Plate Annealed 485 170 40 88 HRB
304H S30409 Plate Annealed 515 205 40 92 HRB
309S S30908 Bar Annealed 515 205 40 95 HRB
310 S31000 Plate Annealed 515 205 40 95 HRB
316 S31600 Plate Annealed 515 205 40 95 HRB
316L S31603 Plate Annealed 485 170 40 95 HRB
317L S31703 Plate Annealed 515 205 40 95 HRB
321 S32100 Sheet Annealed 515 205 40 95 HRB
347 S34700 Plate Annealed 515 205 40 92 HRB
904L N08904 Plate Annealed 490 220 35 70 – 90 NRB
typical
Grade UNS No. ASTM standard and product  use
A167
A240
A666 sheet,
coil, strip, plate		 A312
A358
A409 pipe		 A213
A249
A269
A554 tube		 A403 buttweld fittings A276
A582 bar and shapes		 A313
A493
A580 wire		 A182 flanges pressure fittings
Austenitic stainless steels
253MA S30815
301 S30100
302HQ S30430
303 S30300 Also
UGIMA
304 S30400 Also
UGIMA
304L S30403
304H S30409
309S S30908
310 S31000
316 S31600 Also
UGIMA
316L S31603
317L S31703
321 S32100
347 S34700
904L N08904
Grade UNS No. Properties and typical  applications
Austenitic stainless steels
253MA S30815 Excellent resistance to scaling and useful creep strength at temperatures up to 1150˚C.
301 S30100 Combination of strength and ductility to withstand severe forming methods. Corrosion resistance comparable to 302. Rail cars, automotive components.
302HQ S30430 Wire for severe cold heading such as the manufacture of cross recess screws. Corrosion resistance at least equivalent to type 304.
303 S30300 Free machining grade.  Domestic and mild industrial environment. Water low in chlorides. Nuts and bolts, shafts, fittings. Corrosion resistance lower than  304.
304 S30400 Good resistance to corrosion, good  for malleability and weldability. Most commonly used grade. Wine storage,  laundry and kitchen products, water,  food, architectural, cryogenic and high temperature applications. UGIMA 304 – improved machinability bar with same properties.
304L S30403 Corrosion resistance as for 304. Low carbon  variation for heavy gauge  welded sections.
304H S30409 Corrosion resistance as for 304. High carbon  gives improved high temperature strength.
309S S30908 Excellent resistance to corrosion, particularly attack  by hot sulphur compounds in oxidising gases. Sulphite liquors and acids such as acetic, citric, lactic and nitric. Welding wire for joining dissimilar steels.
310 S31000 Excellent corrosion resistance at normal temperatures. Good resistance to oxidisation and carburising atmospheres in high temperatures over 850˚C to 1100˚C. Welding wire for joining dissimilar steels.
316 S31600 High corrosion resistance to the complex sulphur compounds used in pulp and paper processing. Also resists attack  by marine and corrosive industrial atmospheres. Suitable for mild seacoast  atmosphere, pulp and paper,  heat  exchangers,  propeller shafts, dying equipment. UGIMA 316 improved machinability bar, with same properties.
316L S31603 Corrosion resistance as for 316.
Low carbon  variation, suitable for heavy gauge  welding.
317L S31703 Improved corrosion resistance over type 316. Often successfully applied where  type 316 has given only moderate performance. Applications such as acetic acid distillation, pulp and paper machinery, ink and dying processes.  317L is a variation of 317 suitable for heavy gauge  welding.
321 S32100 Excellent corrosion resistance, equivalent to 304 in the annealed condition and superior if the application involves service in 425˚C-870˚C range.  Typical applications include expansion joints, furnace  parts, aerospace and power  industries, heat  exchangers  and steam  generators.
347 S34700 This grade  is resistant to chromium carbide precipitation. Most commonly found  as a consumable for welding 321.
904L N08904 ‘Super austenitic’ grade  with very high corrosion resistance, especially to strong  acids and chlorides. Frequently used in sulphuric acid service.
Grade UNS No. Chemical analysis (%) specified
C Si Mn P S Cr Mo Ni Other
Ferritic stainless steels
3CR12 (Note 3) 1.4003 0.03 1 1.5 0.04 0.015 10.5 – 12.5 0.3 – 1.0 N 0.03
409 S40900 0.08 1 1 0.045 0.03 10.5 – 11.75 0.5 Ti 6xC min.
0.75  max.
430 S43000 0.12 1 1 0.04 0.03 16.0 – 18.0 0.75
430F S43020 0.12 1 1.25 0.06 0.15 min. 16.0 – 18.0
434 S43400 0.12 1 1 0.04 0.03 16.0 – 18.0 0.75 – 1.25
Ferritic/Austenitic (Duplex)  stainless steels
2205 S31803 0.03 1 2 0.03 0.02 21.0 – 23.0 2.5 – 3.5 4.5 – 6.5 N 0.08 – 0.20
UR52N+ S32520
S32550		 0.03 0.8 1.5 0.035 0.02 24.0 – 26.0 3.0
4.0		 5.5 – 8.0 N 0.20-0.35
Cu 0.5-2.0
Martensitic stainless steels
410 S41000 0.15 1 1 0.04 0.03 11.5 – 13.5 0.75
420 S42000 0.15 min 1 1 0.04 0.03 12.0 – 14.0
431 S43100 0.2 1 1 0.04 0.03 15.0 – 17.0 1.25 – 2.50
Precipitation hardening steel
630 S17400 0.07 1 1 0.04 0.03 15.0 – 17.5 3.0 – 5.0 Cu 3.0-5.0
Nb + Ta 0.15-0.45
Grade UNS No. Mechanical  properties specified (Note  4)
Common form Treatment Tensile strength MPa (min.) Yield strength (0.2% offset) MPa (min.) Elongation
%} in 50mm
(min.)		 Hardness (max) (Note 2)
Ferritic stainless steels
3CR12 (Note 3) 1.4003 Plate Annealed 450 – 650 280 (>6mm)
320 (≤6mm)		 18 (>6 mm)
20 (≤6mm)		 220 HB (≤12mm)
250 (>12mm)
409 S40900 Tube Annealed 380 205 20 95 HRB
430 S43000 Sheet Annealed 450 205 22 89 HRB
430F S43020 Bar Annealed 550 380 25 262 HB
434 S43400 Sheet and strip Annealed 450 240 22 89 HRB
Ferritic/Austenitic (Duplex)  stainless steels
2205 S31803 Plate Annealed 620 450 25 31 HRC
+ UR52N S32520
S32550		 Plate Annealed 770 550 25 310 HRB
Martensitic stainless steels
410 S41000 Plate Annealed 450 205 20 96 HRB
420 S42000 Bar Annealed 655 typical 345 typical 25 typical 241 HB
431 S43100 Bar Annealed 860 typical 285 HRB
Precipitation hardening steel
630 S17400 Bar Solution treated 1105 typical 1000 typical 15 typical 38 HRC
Grade UNS No. ASTM standard and product  use
A167
A240
A666 sheet,
coil, strip, plate		 A312
A358
A409 pipe		 A213
A249
A269
A554 tube		 A403 buttweld fittings A276
A582 bar and shapes		 A313
A493
A580 wire		 A182 flanges pressure fittings
Ferritic stainless steels
3CR12 (Note 3) 1.4003
409 S40900
430 S43000
430F S43020
434 S43400
Ferritic/Austenitic (Duplex)  stainless steels
2205 S31803
+ UR52N S32520
S32550
Martensitic stainless steels
410 S41000
420 S42000
431 S43100
Precipitation hardening steel
630 S17400
Grade UNS No. Properties and typical  applications
Ferritic stainless steels
3CR12 (Note 3) 1.4003 Useful corrosion resistance particularly in wet abrasion environments. Readily welded and formed into tanks, flues, bins, chutes,  rail wagons,  etc.
409 S40900 Resists atmospheric and automotive exhaust  gas corrosion. Extensively used in auto  exhaust systems.
430 S43000 Good combinations of corrosion resistance, formability and mechanical properties. Typical applications include automotive trims, element supports, cold headed fasteners,  refrigerator doors.
430F S43020 430F is a free machining version of 430, suitable for high speed  machining. Corrosion resistance is lower than  430.
434 S43400 Molybdenum improves the pitting resistance over grade  430. Good for automotive trim components.
Ferritic/Austenitic (Duplex)  stainless steels
2205 S31803 2205  microstructure is approximately 50%  ferrite and 50%  austenitic, which results in the steel possessing high strength and hardness,  and resistance to erosion, fatigue, stress corrosion cracking and pitting and crevice corrosion. Applications in marine, chemical and petrochemical industries.
UR52N+ S32520
S32550		 ‘Super Duplex’ grade  exhibiting exceptional resistance to hot chlorides and sulphides with high strength. Applications in marine, chemical and petrochemical industries.
Martensitic stainless steels
410 S41000 Resists dry atmospheres, fresh water,  mild alkalines and acids, steam  and hot gases. Must be hardened for maximum heat  and corrosion resistance. Typical applications include cold heading, bolts, nuts and screws, pump  parts and shafts, steam  and gas turbine parts, mine ladder rungs.
420 S42000 Good resistance in the hardened condition to the atmosphere. Food, fresh water  and mild alkalines or acids. Higher carbon  hardenable grade.  Typical applications include cutlery, surgical instruments, shear blades, needle valves.
431 S43100 Excellent resistance to a wide variety of corrosive media, approaching that  of 304. High tensile and torque  strength. Pump and boat  shafts, nuts, bolts and marine hardware.
Precipitation hardening steel
630 S17400 Precipitation hardening (‘aging’) treatment after machining gives high strength without distortion. Corrosion resistance similar to type 304. Pump shafts and valve spindles.