Aisi 304 stainless steel properties and aisi 304 stainless steel chemical composition
By:Win Sep 01, 2020
AISI 304 is American standard 304 stainless steel, which has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no heat treatment hardening phenomenon, and non-magnetic.
Aisi 304 stainless steel meaning
Aisi304 means American Iron and Steel Institute, 304 is a stainless steel grade consisting of three Arabic numerals, the first digit indicates the type of steel. The second and third digits indicate the sequence number.
AISI 304 is a steel grade developed and evolved on the basis of the 18-8 type austenitic stainless steel originally invented. This steel is the main steel grade of stainless steel, and its output accounts for more than 30% of the total stainless steel output. Because this steel has an austenitic structure, it cannot be strengthened by heat treatment, and only cold deformation can be used to increase the strength. The austenitic structure of steel gives it good cold and hot workability, non-magnetic properties and good low temperature properties.
AISI 304 applications:
household goods, cabinets, indoor pipelines, water heaters, boilers, bathtubs, auto parts, medical appliances, building materials, chemicals, food industry, agriculture, and ship parts.
Aisi 304 stainless steel properties
• AISI 304 has good corrosion resistance, heat resistance, low temperature strength and comprehensive mechanical properties, and is widely used in food equipment, chemical equipment and nuclear industrial equipment.
• Aisi 304 is the most widely used and most widely used stainless steel grade. This steel is suitable for manufacturing deep-drawn parts and transporting corrosive medium pipes, containers, structural parts, etc. It can also be used to manufacture non-magnetic, low-temperature equipment and components.
• It can be used in food equipment, general chemical equipment, papermaking machinery and equipment, medical machinery and equipment, pressure vessels, industrial equipment for nuclear energy, etc.
Aisi 304 stainless steel chemical composition
• Chemical composition:
Carbon C: ≤0.07
Silicon Si: ≤1.00
Manganese Mn: ≤2.00
Sulfur S: ≤0.030
Phosphorus P: ≤0.035
Chromium Cr: 17.00～19.00
Nickel Ni: 8.00～11.00
• Mechanical properties:
Tensile strength σb (MPa): ≥520
Conditional yield strength σ0.2 (MPa): ≥205
Elongation δ5 (%): ≥40
Reduction of area ψ (%): ≥60
Hardness: ≤187HB; ≤90HRB; ≤200HV
AISI 304 has good intergranular corrosion resistance. It has excellent corrosion resistance in many oxidizing acids (such as HNO3). It also has excellent corrosion resistance in alkaline solutions, most organic and inorganic acids, as well as in the atmosphere, water and steam. Strong corrosion resistance. The relative machinability Kr of AISI 304 is about 0.4, which is a typical difficult-to-cut material.