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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, %
ASTMAISI (UNS)C, ≤Si, ≤Mn, ≤P, ≤S, ≤CrNiN, ≤Product
ASTM A240/A240M304 (UNS S30400)0.070.752.000.0450.03017.5-19.58.0-10.50.10Plate, Sheet, and Strip
ASTM A276A/276M0. 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 TypeAISI (UNS)Tensile Strength, (MPa), ≥Yield Strength, ≥ (MPa) at 0.2% OffsetElongation in 50 mm (%, ≥)Reduction of Area, %, ≥Brinell Hardness, (HBW) ≤Rockwell Hardness, (HRBW)  ≤ProductCondition
ASTM A240/A240M304 (UNS S30400)5152054020192Plate, Sheet, and Strip
ASTM A276A/276M5152054050Bars and ShapesHot finished
6203103040Cold finished, Dia ≤ 12.7mm
5152053040Cold 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.

  • 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·m0.72 at 20 °C (68 °F)
Conductivity, %, IACS2.5
Magnetic permeability1.02 (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)


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
USEuropean UnionISOJapanChinaAustraliaIndiaRusiaKorea
StandardTypeStandardGrade (Steel Number)StandardGrade (ISO Number)StandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGrade
ASTM A276/A276M;
ASTM A240/A240M;
(UNS S30400)
EN 10088-1; EN 10088-2; EN 10088-3X5CrNi18-10 (1.4301)ISO 15510X5CrNi18-10JIS G4303; JIS G4304; JIS G4305;SUS304GB/T 20878;
GB/T 1220;
GB/T 3280
06Cr19Ni10 (New designation)
(UNS S30403)
X2CrNi18-9 (1.4307);
X2CrNi19-11 (1.4306)
X2CrNi19-11 (4306-304-03-I)SUS304L00Cr19Ni10;
022Cr19Ni10 (New name)

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