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

0 1,295

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)CSiMnPSCrNiNProduct
ASTM A240/A240M304 (UNS S30400)0.070.752.000.0450.03017.5-19.58.0-10.50.10Plate, Sheet, and Strip
ASTM A276A/276M0.081.002.000.0450.03018.0-20.08.0-11.0Bars 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)
MagneticNo
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 (100 ℃) (212 °F)
21.5 (500 ℃) (932 °F)
Mean coefficient of thermal expansion, (10-6/K)17.2 (0-100 ℃) (32-212 °F)
17.8 (0-315 ℃) (32-600 °F)
18.4 (0-538 ℃) (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 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.

Leave A Reply

Your email address will not be published.

We use cookies to improve your experience on our website. By browsing this website, you agree to our use of cookies. Accept Read More