一、前言 我厂生产的某些50AZ钢零件,成品热处理要求表面光亮,淬火硬度≥HRC56,回火后硬度为HRC49～53,热处理过程中不允许有脱碳、氧化现象。过去采用油炉淬火,劳动强度大,环境污染严重,而且产品质量难以保证。采用乙醇裂化作保护气氛,不但改善了劳动条件,消除了环境污染,提高了生产效率,而且产品质量稳定可靠。 First, the foreword I produced some 50AZ steel parts, finished products require surface heat treatment, quenching hardness ≥ HRC56, after tempering hardness HRC49 ~ 53, heat treatment process does not allow decarburization, oxidation phenomenon. In the past using oil furnace quenching, labor-intensive, serious environmental pollution, and product quality is difficult to guarantee. Ethanol cracking for the protection of the atmosphere, not only improved working conditions, eliminating environmental pollution and improve production efficiency, and product quality is stable and reliable.