采用转炉→精炼炉→真空脱气→方坯连铸→加热→粗轧→中轧→精轧→减定径→吐丝→XDWP(Xingcheng Direct Water Patenting)冷却→斯太尔摩风冷冷却的方式试验生产基于10B21钢的8.8级非调紧固件用热轧盘条.通过控制减定径温度为813℃,吐丝温度为828℃,斯太尔摩辊道速率设置为0.75 m/s,在连续经过XDWP冷却和斯太尔摩风冷后获得的热轧盘条抗拉强度达到680 MPa,断后伸长率为23.6%,断面收缩率为75%,力学性能完全满足GB/T 29087―2012的要求.且经过1/4冷顶锻和25%的大减面率拉拔试验,其结果满足紧固件用户使用要求.
Research and Development of 10B21 Wire Rod for 8.8 Grade Non-quenched and Tempered Fasteners
Grade 8.8 non-quenched and tempered fastener hot rolled wire rod based on 10B21 steel was test produced by means of converter → refining furnace → vacuum degassing → square billet continuous casting → heating → rough roll-ing → medium rolling → finishing rolling → diameter reduction → spinning → XDWP(Xingcheng Direct Water Patent-ing)cooling → Stelmor air cooling.By controlling the reducing diameter temperature to 813℃,the spinning temperature to 828℃,and the Stelmor roller table rate to 0.75 m/s,the tensile strength of the hot rolled wire rod reached 680 MPa,the total elongation to 23.6%,section shrinkage to 75%,after continuous XDWP cooling and Stelmor air cooling.Me-chanical properties fully met the requirements of GB/T29087―2012.After 1/4 cold top forging and 25%drawing test of large reduction rate,the results met the requirements of fastener users.
8.8 Grade Non-quenched and Tempered Fastener10B21 SteelXDWPBainite
NETL
NSTL
万方数据
维普
