辊底式退火炉与台车式退火炉处理45A小圆钢正火质量对比  

Comparison of 45A bar normalization quality treated by roll bottom annealing furnace and car-type annealing

作　　者：牛伟[1] 包文全 刘桂江[1] 

机构地区：[1]抚顺特殊钢股份有限公司技术处,辽宁抚顺113001

出　　处：《轧钢》2017年第4期81-83,共3页Steel Rolling

摘　　要：采用辊底式退火炉与台车式退火炉两种方式对45A小圆钢进行正火处理,并分析了其力学性能、表面脱碳及晶粒度。结果表明:辊底式退火炉正火的45A小圆钢综合力学性能明显较台车式退火炉处理的好,强度指标可以提高50~100 MPa,表面脱碳层深度减少0.2~0.5mm,晶粒度为8级,较台车式退火炉处理的高3~6级,且钢材表面弯曲度小,为后续机械矫直工序节约了人力物力,缩短了生产周期。Two different annealing furnace of roll bottom annealing furnace and car-type annealing furnace were used for normalizing the 45A small round bars.This test results of the mechanical properties,surface decarburization and grain size of bars were analyzed,and showed that the mechanical properties of 45A small bars treated by roll bottom annealing furnace were better than that by car-type annealing furnace.Its strength index increased by 50-100 MPa,surface decarburization depth reduced by 0.2-0.5mm,and grain size reduced by 2-5 grade.The bending curve of bars was smaller,which saved the straightening work time.

关 键 词：45A圆钢 辊底式退火炉 台车式退火炉 正火 脱碳 晶粒度 

分 类 号：TG161[金属学及工艺—热处理]