Abstract: 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 rolling → medium rolling → finishing rolling → diameter reduction → spinning → XDWP （Xingcheng Direct Water Patenting） 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. Mechanical 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.

Key words: 8.8 Grade Non-quenched and Tempered Fastener, 10B21 Steel, XDWP, Bainite

摘要： 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。

关键词: 8.8级非调紧固件, 10B21钢, XDWP, 贝氏体