Characteristics of SUS304: It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good Hot working properties such as stamping and bending, no heat treatment hardening, and no magnetism.

SUS304 is used for household items, cabinets, indoor pipelines, water heaters, boilers, bathtubs, automotive accessories, medical equipment, building materials, chemicals, food industry, agriculture, and ship components.

Metallographic structure: The organizational feature is the Austenitic type. The GB brand is 0Cr18Ni9. However, the strength at room temperature is relatively low, with a greater tendency towards intergranular corrosion and stress corrosion, and poor machinability. Due to the poor thermal conductivity of 18-8 stainless steel, it is not only necessary to preheat before quenching and heating, but also requires a longer insulation time during solution treatment (quenching and heating). The cooling medium is generally clean water. Heating steel to a certain temperature and holding it for a period of time, then slowly cooling it, is called annealing. The purpose of annealing is to eliminate structural defects, improve the structure, homogenize composition, refine grains, improve the mechanical properties of steel, and reduce residual stress; At the same time, it can reduce hardness, improve plasticity and toughness, and improve cutting performance. It can eliminate the network cementite of hypereutectoid steel, refine the lattice of hypoeutectoid steel by normalizing, improve comprehensive mechanical properties, and replace annealing process with normalizing for parts with low requirements is relatively economical. The commonly used quenchants in quenching include water, alkaline water, and salt solutions.

Quenching and tempering treatment: The heat treatment method of high-temperature tempering after quenching is called quenching and tempering treatment. High temperature tempering refers to tempering between 500-650 ℃.