Processing of potentially corrosive liquids e.g. chemicals/oil/beverages/sewage, structural uses in corrosive environments, e.g. nuclear plants, ships, offshore oil installations, underwater cables and pipes
AISI 308 Stainless SteelComposition detail
C (carbon)
0
–
0.08
%
Cr (chromium)
19
–
21
%
Fe (iron)
63.8
–
71
%
Mn (manganese)
0
–
2
%
Ni (nickel)
10
–
12
%
P (phosphorus)
0
–
0.045
%
S (sulfur)
0
–
0.03
%
Si (silicon)
0
–
1
%
AISI 308 Stainless Steel Physical properties
Density
7.8
–
8.01
g/cm3
AISI 308 Stainless SteelMechanical properties
Young’s modulus
189
–
197
GPa
Specific stiffness
23.8
–
25
MN.m/kg
Yield strength (elastic limit)
205
–
310
MPa
Tensile strength
515
–
620
MPa
Specific strength
25.9
–
39.2
kN.m/kg
Elongation
30
–
50
% strain
Compressive strength
205
–
310
MPa
Flexural modulus
189
–
197
GPa
Flexural strength (modulus of rupture)
205
–
310
MPa
Shear modulus
74
–
78
GPa
Bulk modulus
134
–
146
GPa
Poisson’s ratio
0.265
–
0.275
Shape factor
62
Hardness – Vickers
160
–
200
HV
Hardness – Rockwell B
82
–
92
HRB
Hardness – Rockwell C
0
–
12
HRC
Hardness – Brinell
135
–
193
HB
Elastic stored energy (springs)
109
–
232
kJ/m3
Fatigue strength at 10^7 cycles
229
–
253
MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles
AISI 308 Stainless Steel Optical, aesthetic and acoustic properties
Transparency
Opaque
Acoustic velocity
4880
–
5000
m/s
Mechanical loss coefficient (tan delta)
9.5e-4
–
0.0013
AISI 308 Stainless Steel Processing properties
Metal casting
Unsuitable
Metal cold forming
Acceptable
Metal hot forming
Acceptable
Metal press forming
Acceptable
Metal deep drawing
Limited use
Machining speed
25.3 m/min
Weldability Notes: Preheating and post weld heat treatments are not required
Excellent
Weldability – MIG
Excellent
Weldability – plasma
Excellent
Weldability – SAW
Excellent
Weldability – TIG
Excellent
Brazeability
Good
Carbon equivalency
0.8 – 1.08
AISI 308 Stainless Steel Durability
Water (fresh)
Excellent
Water (salt)
Excellent
Weak acids
Excellent
Strong acids
Acceptable
Weak alkalis
Excellent
Strong alkalis
Excellent
Organic solvents
Excellent
Oxidation at 500C
Excellent
UV radiation (sunlight)
Excellent
Galling resistance (adhesive wear) Notes: Aluminum bronze is the most suitable mating material to minimize galling.
Limited use
Flammability
Non-flammable
AISI 308 Stainless Steel Corrosion resistance
Pitting resistance equivalent number (PREN)
19 – 21
Pitting and crevice corrosion
Medium (20-30)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide
Slightly susceptible
Intergranular (weld line) corrosion
Restricted
Inorganic acids
Moderate
Organic acids
Moderate
Alkalis
Moderate
Humidity / water
Excellent
Sea water
Moderate
Sour oil and gas
Moderate
AISI 308 Stainless Steel Standards with similar compositions-Equivalent Grades
Canada: 308 to CSA G110.3, 308 to CSA G110.6
Mexico: 308 to NMX-B-83
USA: 308 to ASTM A167-99, 308 to ASTM A473, CF8C to ACI (SFSA), CPF8C (Ta max) to ASTM A451/A451M, CPF8C to ASTM A451/A451M, S30800 to ASTM A276, S30800 to ASTM A314-97, S30800 to ASTM A580/A580M-98, S30800 to ASTM A959, UNS S30800
Tradenames: AIRCO CODE-ARC 308/308H MR, CARPENTER MANIFLEX II, IMPHY 308, IN-FLUX 308-G/S, JOSLYN STAINLESS TYPE 308, LNS 304 H, RUSTLESS 20-10, TIMKEN TYPE 308 STAINLESS, U.S.S. 20-10 S, UNILOY 308
