What is 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), especially type 304 stainless steel (UNS 30400), also including AISI 304L, 304N, 304H. 18/8 steel is the most widely used material in stainless steel, 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 grade stainless steel.

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.

  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3;
  • 1 μΩ·m = 1 Ω·mm²/m
  • 1 GPa = 1 kN/mm2
Physical Properties
Density, g/cm37.93
Melting point1398-1454 ℃ (2550-2650 °F)
Magnetic permeability1.02 (Approximate)
Specific heat capacity, J/(Kg·K)500 (0-100 ℃)
Electrical resistivity, μΩ·m0,73 (20 ℃)
Modulus of elasticity (Elastic modulus), Gpa193 GPa (28×106 psi)
Thermal diffusivity, mm2/s3.84 (20-100 ℃)
Thermal conductivity (W/m·K)16.3 at 100 ℃ (212 °F)
21.5 at 500 ℃ (932 °F)
Mean coefficient of thermal expansion, (10-6/K)17.2 at 0-100 ℃ (32-212 °F)
17.8 at 0-315 ℃ (32-600 °F)
18.4 at 0-538 ℃ (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 kitchen ware, tableware, medical device, machinery and parts, wire mesh, filter, architectural and decorative metal products, etc.

For more information about 18/8 steel, please refer to AISI 304 stainless steel.

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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