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我厂生产的气门是经电镦蒜头模压成型空冷再调质处理的,在电镦蒜头过程中,由于电镦的电流不稳定,电镦温度增高,使产品造成过热,过烧组织粗大,原我们认为,将钢加热到临界点（ AC_s）以上重新奥氏体化后可以得到细晶粒,因电镦造成的过热组织可以在调质。处理中细化得到改善。但是实践证明电镦过热引起的组织粗大,经调质经理局并没有得到细化,而保留原来的粗大品位尺寸。这种现象与组织遗传有关。
I plant the valve is produced by the electric upsetting molding air-cooled and then quenched and tempered, the electric upsetting garlic process, due to electric upsetting current instability, electric upsetting temperature increases, the product caused by overheating, over-burning coarse tissue, the original In our opinion, when the steel is heated above the critical point (AC_s), re-austenitization can produce fine grains, and the overheated structure caused by electric upsetting can be tempered. Processing refinement has been improved. However, the practice proved that the electrical upsetting caused by thick tissue, the quality control bureau has not been refined, while retaining the original size of coarse size. This phenomenon is related to the genetic organization.