304 Stainless Steel Properties – Physical, Mechanical Properties

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304 Stainless Steel Properties – Physical and Mechanical Properties

The properties of 304 stainless steel including chemical properties, physical characteristics, thermal properties and mechanical properties, etc. The density of stainless steel 304 is 7.93 g/cm3 (0.286 lb/in3), melting point is 1400-1450 °C (2550-2650 °F), thermal conductivity is 16.2 W/m·K at 100 °C (9.4 Btu/ft·h·°F at 212 °F), yield strength is 205 MPa (30 ksi), tensile strength is 515 MPa (75 ksi), modulus of elasticity (elastic modulus) is 193 GPa (28 x 106 psi), Brinell hardness is 201 HB.

Physical Properties

304 stainless steel physical properties are listed in the table below such as density, melting point, specific heat, electrical resistivity, elastic modulus (modulus of elasticity), thermal conductivity, and coefficient of thermal expansion (CTE), etc.

Notes:

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
Type 304 Physical Properties Metric Imperial
Density 7.93 g/cm3 0.286 lb/in3
Melting point 1400-1450 °C 2550-2650 °F
Specific heat capacity 500 J/kg·K at 20 °C 0.12 Btu/lb ·°F at 68 °F
Electrical resistivity 0.72 μΩ·m at 20 °C 28.35 μΩ·in. at 68 °F
Conductivity, %, IACS 2.5
Magnetic permeability 1.02 (Approximate)
Elastic modulus (Modulus of Elasticity) 193 GPa 28 x 106 psi
Thermal diffusivity 3.84 mm2/s 0.006 in2/s
Thermal conductivity 16.2 W/m·K at 100 °C 9.4 Btu/ft·h·°F at 212 °F
21.5 W/m·K at 500 °C 12.4 Btu/ft·h·°F at 932 °F
Coefficient of thermal expansion (CTE) 17.2 10-6/K at 0-100 °C 9.6 μin./in.·°F at 32-212 °F
17.8 10-6/K at 0-315 °C 9.9 μin./in.·°F at 32-600 °F
18.4 10-6/K at 0-538 °C 10.2 μin./in.·°F at 32-1000 °F

304 Stainless Steel Mechanical Properties

304 stainless steel mechanical properties are given in the datasheet below including tensile strength, yield strength, elongation, reduction in area, Brinell and Rockwell hardness, etc.

ASTM A276 Type 304 Stainless Steel Mechanical Properties
ASTM AISI (UNS) Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Reduction of Area, %, ≥ Conditions
ASTM A276/A276M 304 (UNS S30400),
304LN (UNS S30453)
515 (75) 205 (30) 40 50 Annealed, Hot finished
620 (90) 310 (45) 30 40 Annealed, Cold finished, Dia ≤ 1/2 in (12.7mm)
515 (75) 205 (30) 30 40 Annealed, Cold finished, Dia > 1/2 in (12.7mm)
ASTM A240 Type 304 Steel Mechanical Properties
ASTM AISI (UNS) Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Brinell Hardness, HB, ≤ Rockwell Hardness, HRB,  ≤
ASTM A240/A240M 304 (UNS S30400) 515 (75) 205 (30) 40 201 92
ASTM A666 Type 304 Mechanical Properties
ASTM Standard AISI Type (UNS) Conditions Tensile Strength, MPa (ksi), ≥ 0.2% Yield Strength, MPa (ksi), ≥ Elongation in 50 mm (2 in.), %, ≥ Brinell Hardness (HB), ≤ Rockwell Hardness (HRB), ≤
ASTM A666 304 (UNS S30400) Annealed 517 (75) 205 (30) 40 201 92
1/2 Hard (Half Hard) 1035 (150) 760 (110) 6 (<0.015 in);
7 (≥ 0.015 in)
1/4 (Quarter-hard) Hard 862 (125) 517 (75) 10 (≤ 0.03 in);
12 (> 0.03 in)
1/8 Hard 690 (100) 380 (55) 35
SS 304 plate, strip, sheet 1/16 Hard 550 (80) 310 (45) 40
304 flat bar 620 (90) 310 (45) 40 (>0.030 in)
ASTM A313 Type 304 Stainless Steel Spring Wire Tensile Strength Requirements
Diameter (d), in. Diameter (d), mm Bend Test, Minimum Number of Bends ksi MPa
≤0.009 ≤0.23 325-355 2240-2450
0.009<d≤0.010 0.23<d≤0.25 320-350 2205-2415
0.010<d≤0.011 0.25<d≤0.28 318-348 2190-2400
0.011<d≤0.012 0.28<d≤0.30 316-346 2180-2385
0.012<d≤0.013 0.30<d≤0.33 314-344 2165-2370
0.013<d≤0.014 0.33<d≤0.36 312-342 2150-2360
0.014<d≤0.015 0.36<d≤0.38 310-340 2135-2345
0.015<d≤0.016 0.38<d≤0.41 308-338 2125-2330
0.016<d≤0.017 0.41<d≤0.43 306-336 2110-2315
0.017<d≤0.018 0.43<d≤0.46 304-334 2095-2300
0.018<d≤0.020 0.46<d≤0.51 300-330 2070-2275
0.020<d≤0.022 0.51<d≤0.56 296-326 2040-2250
0.022<d≤0.024 0.56<d≤0.61 292-322 2015-2220
0.024<d≤0.026 0.61<d≤0.66 291-320 2005-2205
0.026<d≤0.028 0.66<d≤0.71 8 289-318 1995-2190
0.028<d≤0.031 0.71<d≤0.79 8 285-315 1965-2170
0.031<d≤0.034 0.79<d≤0.86 8 282-310 1945-2135
0.034<d≤0.037 0.86<d≤0.94 8 280-308 1930-2125
0.037<d≤0.041 0.94<d≤1.04 8 275-304 1895-2095
0.041<d≤0.045 1.04<d≤1.14 8 272-300 1875-2070
0.045<d≤0.050 1.14<d≤1.27 8 267-295 1840-2035
0.050<d≤0.054 1.27<d≤1.37 8 265-293 1825-2020
0.054<d≤0.058 1.37<d≤1.47 7 261-289 1800-1990
0.058<d≤0.063 1.47<d≤1.60 7 258-285 1780-1965
0.063<d≤0.070 1.60<d≤1.78 7 252-281 1735-1935
0.070<d≤0.075 1.78<d≤1.90 7 250-278 1725-1915
0.075<d≤0.080 1.90<d≤2.03 7 246-275 1695-1895
0.080<d≤0.087 2.03<d≤2.21 7 242-271 1670-1870
0.087<d≤0.095 2.21<d≤2.41 7 238-268 1640-1850
0.095<d≤0.105 2.41<d≤2.67 5 232-262 1600-1805
0.105<d≤0.115 2.67<d≤2.92 5 227-257 1565-1770
0.115<d≤0.125 2.92<d≤3.17 5 222-253 1530-1745
0.125<d≤0.135 3.17<d≤3.43 3 217-248 1495-1710
0.135<d≤0.148 3.43<d≤3.76 3 210-241 1450-1660
0.148<d≤0.162 3.76<d≤4.11 3 205-235 1415-1620
0.162<d≤0.177 4.11<d≤4.50 3 198-228 1365-1570
0.177<d≤0.192 4.50<d≤4.88 1 194-225 1335-1550
0.192<d≤0.207 4.88<d≤5.26 1 188-220 1295-1515
0.207<d≤0.225 5.26<d≤5.72 1 182-214 1255-1475
0.225<d≤0.250 5.72<d≤6.35 1 175-205 1205-1415
0.250<d≤0.278 6.35<d≤7.06 1 168-198 1160-1365
0.278<d≤0.306 7.06<d≤7.77 1 161-192 1110-1325
0.306<d≤0.331 7.77<d≤8.41 1 155186 1070-1280
0.331<d≤0.362 8.41<d≤9.19 1 150-180 1035-1240
0.362<d≤0.394 9.19<d≤10.00 1 145-175 1000-1205
0.394<d≤0.438 10.00<d≤11.12 1 140-170 965-1170
0.438<d≤0.500 11.12<d≤12.70 1 135-165 930-1140
>0.500 >12.70 130-160 895-1105
When wire is specified in straightened and cut lengths, the minimum tensile strength shall be 90 % of the values listed in the table.
ASTM A473 Type 304 Mechanical Properties
ASTM AISI (UNS) Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Reduction of Area, %, ≥ Sections Conditions
ASTM A473/A473M 304 (UNS S30400) 515 (75) 205 (30) 40 50 ≤ 5 in. (127 mm) Annealed
485 (70) > 5 in. (127 mm) Annealed
ASTM A479 Type 304 Mechanical Properties
ASTM AISI (UNS) Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Reduction of Area, %, ≥ Conditions
ASTM A479/A479M 304, 304H, 304LN 515 (75) 205 (30) 30 40 Annealed
ASTM A580 Type 304 Mechanical Properties
ASTM AISI (UNS) Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Reduction of Area, %, ≥ Conditions
ASTM A580/A580M SS 304 (UNS S30400) 620 (90) 310 (45) 30 40 Annealed, cold finished
515 (75) 205 (30) 35 50 Annealed
1 Comment
  1. Kevin Fresa says

    Looking for nonlinear data (physical strength properties) for S304 in the annealed state, from yield threshold to ultimate failure. Stress/strain curves in particular.

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