SS 304 Properties – SS304 Density, Composition, Tensile Yield Strength

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What is SS 304?

SS 304 is the abbreviation of Stainless Steel 304, which is the most widely used austenitic chromium-nickel stainless steel. Its nominal composition is 18% chromium and 8% nickel, so it is also called 18/8 stainless steel. SS304 stainless steel has lower corrosion resistance than SS316 and slightly higher than SS302. SS304 density is 7,930 kg/m3 (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), tensile strength is 515 MPa (75 ksi), yield strength is 205 MPa (30 ksi).

304L is a modified low-carbon stainless steel based on 304, used to improve the corrosion resistance after welding, and has excellent intergranular corrosion resistance after welding or stress relief. It is recommended for parts that cannot be annealed fabrication by welding in certain corrosive environments.

Material SS304 Properties Data Sheet

The tables below summarize the material SS 304 properties data sheet and specifications including chemical composition, physical and mechanical properties, etc.

Stainless Steel SS304 Chemical Composition

SS304 stainless steel chemical composition is listed in the table below.

SS304 Composition, %
ASTM Standard AISI (UNS) C, ≤ Si, ≤ Mn, ≤ P, ≤ S, ≤ Cr Ni N, ≤
ASTM A240/A240M 304 (UNS S30400) 0.07 0.75 2.00 0.045 0.03 17.5-19.5 8.0-10.5 0.1
ASTM A276/A276M 0.08 1.00 2.00 0.045 0.03 18.0-20.0 8.0-11.0
ASTM 666;
SAE J405
0.08 0.75 2.00 0.045 0.03 18.0-20.0 8.0-10.5 0.1
ASTM A313/A313M 0.08 1.00 2.00 0.045 0.03 18.0-20.0 8.0-10.5 0.1
ASTM A479/A479M 0.08 1.00 2.00 0.045 0.03 18.0-20.0 8.0-10.5
ASTM A314;
ASTM A580/A580M
0.08 1.00 2.00 0.045 0.03 18.0-20.0 8.0-10.5 0.1
ASTM A473 0.08 1.00 2.00 0.045 0.03 18.0-20.0 8.0-11.0 0.1
ASTM A959 0.07 1.00 2.00 0.045 0.03 17.5-19.5 8.0-11.0

Notes:

  • ASTM A240/A240M: Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
  • ASTM A276/A276M: Stainless Steel Bars and Shapes
  • ASTM A313/A313M: Stainless Steel Spring Wire
  • ASTM A314: Stainless Steel Billets and Bars for Forging
  • ASTM A473: Stainless Steel Forgings
  • ASTM A479/A479M: Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
  • ASTM A580/A580M: Stainless Steel Wire
  • ASTM 666: Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
  • ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
  • SAE J405: Chemical Composition of SAE Wrought Stainless Steels

Physical Properties

SS 304 material physical properties are given in the following table, including 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
SS 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

Material SS304 Mechanical Properties

Material SS304 mechanical properties are listed in the data sheet below including tensile strength, yield strength, elongation, reduction in area, Brinell and Rockwell hardness, etc.

ASTM A276 SS304 Mechanical Properties
ASTM AISI Tensile Strength, Mpa (ksi), ≥ 0.2% Yield Strength, Mpa (ksi), ≥ Elongation in 2 in. (50 mm), %, ≥ Reduction of Area, %, ≥ Conditions
ASTM A276/A276M 304,
304LN
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 SS 304 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 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 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 SS 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 SS 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 SS304 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 A580/A580M SS 304 (UNS S30400) 620 (90) 310 (45) 30 40 Annealed, cold finished
515 (75) 205 (30) 35 50 Annealed
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