Eight, the quality inspection: 1. The artifacts as stipulated in the corresponding technical documents of projects and test requirements 2. When the mechanical properties of workpiece is unqualified, repeatable heat treatment, but the number of repeat quenching or solid solution is generally not more than two times.Additional tempering does not count as repeated processing artifacts 3. After quenching state or low temperature tempering martensite stainless steel and heat resistant steel workpiece, repeat should be preheated before quenching, annealing and high temperature tempering 4. Heat treatment records should be properly kept for future reference Safe technology: Workpiece heat treatment, must abide by the JB4406-87 "safety technology, heat treatment regulations.