18/8 Stainless Steel Properties, Yield Strength, Composition, Density, Tensile Strength, Hardness

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What is 18/8 Stainless Steel

18/8 stainless steel refers to the chemical composition of stainless steel containing 18% chromium (Cr) and 8% nickel (Ni). Standard 18-8 stainless steel includes SS 304, 304L, 304N, 304LN, 304H, non-standard 18-8 grade includes AISI 301, 302, 301L, 301LN, 302B, etc. 18/8 steel is the most widely used material, has excellent corrosion resistance in mild environments, and has good weldability and mechanical properties.

Datasheet & Specification

The tables below list the datasheet and specification including chemical composition and properties. For full datasheet and specification, please view AISI 304, 304L, 301, and 302.

Chemical Composition

18-8 stainless steel composition is given in table below.

Chemical Composition, %
ASTM AISI (UNS) C, ≤ Si, ≤ Mn, ≤ P, ≤ S, ≤ Cr Ni N, ≤ Product
ASTM A240/A240M 304 (UNS S30400) 0.07 0.75 2.00 0.045 0.030 17.5-19.5 8.0-10.5 0.10 Plate, Sheet, and Strip
ASTM A276A/276M 0.08 1.00 2.00 0.045 0.030 18.0-20.0 8.0-11.0 Bars and Shapes

18/8 Stainless Steel Properties

The following table shows 18/8 stainless steel properties including mechanical properties and physical properties.

Mechanical Properties

The tables below list 18-8 stainless steel mechanical properties including yield strength, tensile strength, elongation and hardness, etc.

Mechanical Properties
ASTM Type AISI (UNS) Tensile Strength, (MPa), ≥ Yield Strength, ≥ (MPa) at 0.2% Offset Elongation in 50 mm (%, ≥) Reduction of Area, %, ≥ Brinell Hardness, (HBW) ≤ Rockwell Hardness, (HRBW)  ≤ Product Condition
ASTM A240/A240M 304 (UNS S30400) 515 205 40 201 92 Plate, Sheet, and Strip
ASTM A276A/276M 515 205 40 50 Bars and Shapes Hot finished
620 310 30 40 Cold finished, Dia ≤ 12.7mm
515 205 30 40 Cold finished, Dia. > 12.7mm

Physical Properties

18-8 stainless steel properties – physical properties including density, melting point, magnetic, specific heat capacity, electrical resistivity, modulus of elasticity (elastic modulus), thermal diffusivity, thermal conductivity and coefficient of thermal expansion.
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
Density, g/cm3 (lb/in3) 7.93 (0.286)
Melting point, °C (°F) 1400-1450 (2550-2650)
Specific heat capacity, J/kg·K (Btu/lb ·°F) 500 (0.12) at 20 °C (68 °F)
Electrical resistivity, μΩ·m 0.72 at 20 °C (68 °F)
Conductivity, %, IACS 2.5
Magnetic permeability 1.02 (Approximate)
Elastic modulus (Modulus of Elasticity), GPa (106 psi) 193 (28)
Thermal diffusivity, mm2/s (in2/s) 3.84 (0.006)
Thermal conductivity, W/m·K (Btu/ft·h·°F) 16.2 (9.4) at 100 °C (212 °F)
21.5 (12.4) at 500 °C (932 °F)
Coefficient of thermal expansion (CTE), 10-6/K (μin./in·°F) 17.2 (9.6) at 0-100 °C (32-212 °F)
17.8 (9.9) at 0-315 °C (32-600 °F)
18.4 (10.2) at 0-538 °C (32-1000 °F)

Applications

18/8 stainless steel is widely used in petroleum & chemical industry, metallurgical machinery, aerospace industry, food processing equipment, instruments, household appliances and hardware manufacturing industries.

18/8 steel is made into a great many intermediate products such as steel sheet & plate, steel tube & pipe, steel bar & flat, rod & wire, etc.

Final products such as all kinds of kitchenware, tableware, medical device, machinery and parts, wire mesh, filter, architectural and decorative metal products, etc.

18-8 stainless steel equivalent grade
US European Union ISO Japan China Australia India Rusia Korea
Standard Type Standard Grade (Steel Number) Standard Grade (ISO Number) Standard Grade Standard Grade Standard Grade Standard Grade Standard Grade Standard Grade
AISI SAE;
ASTM A276/A276M;
ASTM A240/A240M;
304
(UNS S30400)
EN 10088-1; EN 10088-2; EN 10088-3 X5CrNi18-10 (1.4301) ISO 15510 X5CrNi18-10 JIS G4303; JIS G4304; JIS G4305; SUS304 GB/T 20878;
GB/T 1220;
GB/T 3280
0Cr18Ni9;
06Cr19Ni10 (New designation)
304L
(UNS S30403)
X2CrNi18-9 (1.4307);
X2CrNi19-11 (1.4306)
X2CrNi19-11 (4306-304-03-I) SUS304L 00Cr19Ni10;
022Cr19Ni10 (New name)

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