我厂是生产电渣熔铸45钢曲轴的专业厂家,以往均仿照锻钢曲轴的热处理工艺进行生产,即以正火作为预先热处理,调质作为最终热处理。结果不仅热处理成本高,而且曲轴变形量大,在校直中常发生压断事故,未能充分发挥电渣熔铸工艺的优势,为此,我们进行了工艺改进。考虑到经电渣熔铸的45钢中的杂质大为减少,基体组织较母材细密纯净且无大的内应力,因而决定采用亚温处理代替以往的正火+调质处理。一年多来,曲轴变形量大为降低,未发生 I plant is the production of electroslag casting 45 steel crankshaft professional manufacturers, all in the past are forged steel crankshaft heat treatment process for the production, that is normalized as a pre-heat treatment, quenching and tempering as the final heat treatment. As a result, not only the heat treatment cost is high, but also the deformation of the crankshaft is large. In the straightening of the straightening off occurs frequently, the pressure-breaking accident often occurs, and the advantages of the electroslag casting process are not fully exerted. Therefore, we have carried out the process improvement. Taking into account the electroslag cast 45 steel greatly reduced the impurities, the matrix microstructure than the parent material is fine and clean and no major internal stress, and thus decided to use sub-temperature treatment instead of the previous normalizing + quenching and tempering. Over the past year, the crankshaft deformation greatly reduced, did not happen