304

304 stainless steel is standard chrome 18 – nickel 8 Austenitic stainless steel, as the most familiar and most frequently used alloy in the stainless steel family.

304 contains both chromium (usually 18%) and nickel (usually 8%) metals as the main non-iron constituents, it is an Austenite steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, it is not very electrically or thermally conductive, and is non-magnetic, and has a higher corrosion resistance than regular steel.

304 stainless steel data sheet listed in the table below, there specifications contain Chemical Composition, Mechanical Properties, Equivalent Grades, Physical Properties and other features.

304 stainless steel Chemical Composition:

Grade C Mn P S Si Ni Cr N Fe
TP304 0.08 2.00 0.045 0.030 1.0 8-11 18-20 Bal.
SUS304 0.08 2.00 0.040 0.030 1.0 8-10.5 18-20 Bal.
1.4301 0.07 2.00 0.040 0.015 1.0 8-10.5 17-19.5 0.11 Bal.

304 stainless steel Mechanical Properties:

Tensile strength(Mpa) Max Yield point(Mpa) Max Elongation(%) Hardness (HRB) Max
TP304 515 205 35 92
SUS304 520 205 35
1.4301 500-700 195 40

304 stainless steel Equivalent Grades

AISI UNS DIN EN JIS GB
304 30400 1.4301 X5CrNi18-10 SUS304 06Cr19Ni10

Specifications reference: ASTM A240, JIS G 4303, EN 10088-1, GB/T 20878, there material are possible alternative grades, in the most cases, these mterials can be replaced each other.

304 stainless steel Physical Properties

Density Melting Point Specific heat Thermal conductivity [W/(m·K)] Coefficient of Expansion( 10-6/K ) Electrical Resistivity Elastic modulus
 g/cm3 (℃) [J/(kg·K)]   0~100 ℃ 100 ℃ 500 ℃ 0~100 ℃ 0~500 ℃ ( NΩ.m  kN/mm2
7.99 1398~1427 500 16.3 21.5 16.6 18.6 720 193

Physical properties of 304 stainless steel in the annealed condition and room temperature if not stated.

Magnetic

A little after cold worked, no magnetic after heat solution.

Heat treatment

Heat to 1010-1120°C and cool rapidly, 304 cannot be hardened by thermal treatment, it can only be hardened by cold working

Welding

Excellent weldability, both with and without filler metals.

Corrosion Resistance

304 has excellent corrosion resistance in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C.

When 304 stainless steel is too sensitive to pitting or crevice corrosion by chlorides or general corrosion in acidic applications, it is commonly better to use 316/316L stainless steel.

Rust

In common situation, standard 304 stainless steel is not rust, it has good corrosion resistance and oxide resistance characteristics.

However, in some very harsh environment, it can be stain, like chloride exist condition, and corrosion occur fast. If base metal is not perfect, it may be rust too.

Forms

Tube, pipe, plate, sheet, coil, bar, wire,

Applications

  • Household products
  • Auto parts
  • Medical equipment
  • Building materials
  • Chemicals
  • Food process
  • Agriculture
  • Ship parts
  • Heat exchanger