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连杆是柴油机重要零件之一,它要求良好的综合力学性能。中碳或中碳低合金钢经调质处理后,具有良好的综合力学性能,因此,连杆常以45钢为材料(其中碳含量要求精选),以调质处理为最终热处理工艺,以正火处理为中间热处理工艺,即锻造成形后进行正火处理。实际生产中,一些生产单位考虑经济利益,过分依赖锻造余热正火,不经过金相分析,由于取消了正火
Connecting rod is one of the important parts of diesel engine, which requires good comprehensive mechanical properties. Medium-carbon or low-carbon steel after quenched and tempered, has good mechanical properties, therefore, the link often 45 steel for the material (which requires the selection of carbon content) to quenching and tempering for the final heat treatment process to Normalizing treatment for the middle heat treatment process, that is forging after normalizing treatment. In actual production, some production units consider economic interests, over-reliance on forging residual heat and normalizing, without going through the metallographic analysis, due to the cancellation of normalizing