ER50-6盘条拉拔断丝及焊丝焊接飞溅原因探讨

针对国内某钢厂开发的ER50-6焊丝钢盘条拉拔细丝时断裂的问题,以及焊丝焊接时产生焊接飞溅和熔融电流大的现象,查找炼钢、轧制过程引起此类问题的原因并提出改进措施:调整冶炼成分以及精炼时间,使w(P)≤0.015%,w(S)≤0.006%,w(O)≤20×10-6,w(N)≤30×10-6;降低夹杂物级别和气体含量,夹杂物最大级别1.5级;使用与ER50-6成分较为适用的保护渣;调整连铸坯拉速与二冷段配水;轧制时对可能造成红钢划伤的区域加装导轮等措施进行防护;降低轧制温度(850~880℃)和吐丝温度(750~780℃),同时控制风冷线的冷速≤1.0℃/s,集卷温度控制在500~550℃。改进工艺后生产的盘条,拉拔断丝率、焊接电流等指标达到用户要求。

Discussion of wire fracture during drawing of ER50-6 steel wire rod and spatter reason of welding wire welding

In order to solve the fracture of ERS0 - 6 welding wire steel wire rod during drawing of a domestic steel com- pany,welding spatter in the wire welding and large melting current, find the reason that cause these problems in the process of steelmaking and rolling, and raise improvement measures： adjust smelting component and refining time, make w（P） ≤ 0.015%, w（S） ≤0.006%, w（O） 420 x 10 -6, w（N） ≤30 x 10 -6 ; reduce inclusion grade and gas content, all the in- clusion biggest grade are 1.5 grade; use suitable mold power with ERS0 - 6 content; adjust continuous casting billet draw- ing speed and water distribution in secondary cooling section; install the protection measure of guide in the section that probably cause red steel scratch in the rolling process ; reduce rolling （ 850 ~ 880℃） and wire rod laying temperature （750 ~ 780 ℃ ）, and control the cooling speed of air-cooled line ≤ 1.0 ℃/s, control coiling temperature at 500 ~ 550 ℃. After improving the process , producing wire rod, wire fracture rate during drawing and welding current can reach the com- pany requirements,