Solution treatment of 304 stainless steel castings

Solid solution treatment refers to the process of heating the alloy to the temperature at which the second phase can be completely or maximally dissolved into the solid solution, and then keeping it for a period of time, cooling it faster than the second phase precipitates from the solid solution to obtain supersaturated solid solution.

The main purpose of solution treatment is to improve the plasticity and toughness of steel or alloy and prepare for precipitation hardening treatment. Solid solution treatment is a very common processing technology in material science experiments. Solid solution can be obtained from solid solution. Make the various phases in the alloy fully dissolve, strengthen the solid solution, and improve the toughness and corrosion resistance, eliminate stress and softening, in order to continue processing or forming.

304 stainless steel solution treatment, its role has the following points:

1 make 304 stainless steel structure and composition uniform, which is especially important for raw materials, because hot rolling wire rod each section of the rolling temperature and cooling rate is different, resulting in inconsistent structure. At high temperature, the atomic activity intensifies, the σ phase dissolves, the chemical composition tends to be uniform, and the uniform single-phase structure is obtained after rapid cooling.

2. Eliminate work hardening for continuous cold working.

After solution treatment, the TWISTED lattice is recovered, the elongated and fractured grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel tube is reduced, and the elongation is increased.

3. Restore the inherent corrosion resistance of stainless steel.