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Product Introduction
304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm ³, also known as 18/8 stainless steel in the industry. High temperature resistance of 800 ℃, with good processing performance and high toughness, widely used in industrial and furniture decoration industries, as well as food and medical industries.
304 is a universal stainless steel widely used in the production of equipment and components that require good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain at least 18% chromium and at least 8% nickel. 304 stainless steel is a grade of stainless steel produced according to the American ASTM standard.
Scope of application
304 stainless steel is the most widely used chromium nickel stainless steel. As a versatile steel, it has good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties; Good hot workability such as stamping and bending, without heat treatment hardening phenomenon (operating temperature -196 ℃~800 ℃). Corrosion resistance in the atmosphere, if it is an industrial atmosphere or heavily polluted area, it needs to be cleaned in a timely manner to avoid corrosion. Suitable for food processing, storage, and transportation. Has good processing performance and weldability. Plate heat exchangers, corrugated pipes, household items (Class 1 and 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), automotive parts (windshield wipers, mufflers, molded products), medical equipment, building materials, chemicals, food industry, agriculture, ship components, etc. 304 stainless steel is a nationally recognized food grade stainless steel.
Processing Technology
Etching method
Etching processing method is to use screen printing acid resistant protective film on the surface of stainless steel, and then etch it with ferrous chloride solution to form artistic patterns.
Spray painting method
Spray painting is the process of spraying pigment particles onto a pear like surface after screen printing, forming an artistic pattern.
process
The process of spray painting art processing for stainless steel products is: stainless steel products → silk screen printing → etching → alkali treatment → silk screen printing → oxidation coloring → alkali treatment → finished product.
The process of etching art processing for stainless steel products is: stainless steel products → silk screen printing → etching → alkali treatment → oxidation coloring → finished product.
The chemical coloring method of stainless steel does not use pigments or dyes, but immerses stainless steel in a heated concentrated chromium sulfate solution for chemical coloring. Its characteristic is good food resistance. The ink used in this processing method should have very strong acid resistance, and UV sulfurized ink with special properties that are suitable for the processing technology is generally used.
stamping processing
Stainless steel products, especially stainless steel strips, are often processed using punching machines as the most primitive processing method in factories. Stamping includes two methods: direct punching and stretching. Generally, for hardness below 1/2, stretching and bending are used, while for hardness above 1/2, direct punching is used.
物理性能
Tensile strength σ b (MPa) ≥ 515-1035
Conditional yield strength σ 0.2 (MPa) ≥ 205
Elongation rate δ 5 (%) ≥ 40
What is the cross-sectional shrinkage rate (%) ≥?
Hardness: ≤ 201HBW; ≤92HRB; ≤210HV
Density (20 ℃, g/cm³）：7.93
Melting point (℃): 1398-1454
Specific heat capacity (0~100 ℃, KJ·kg-1K-1）：0.50
Thermal conductivity (W · m-1 · K-1): (100 ℃) 16.3, (500 ℃) 21.5
Linear expansion coefficient (10-6 · K-1): (0~100 ℃) 17.2, (0~500 ℃) 18.4
Electrical resistivity (20 ℃, 10-6 Ω· m2/m): 0.73
Longitudinal modulus of elasticity (20 ℃, KN/mm2）：193
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