合金焊丝退火工艺的改进

Improvement of Annealing Process for Alloy Welding Wire

传统工艺退火处理后的合金低碳钢焊丝ER110S,在后续的拉拔加工中,加工硬化导致经常断丝;金相分析发现,退火后的原材料组织中存在大量不连续分布的贝氏体组织和弥散分布的碳化物。应用DSC分析重新确定该材料的相变温度点Ac1、Ac3,通过完全退火和再结晶退火工艺实验,得出700℃保温15h、随炉冷却到300℃出炉空冷的再结晶退火工艺,能够满足焊丝拉拔加工的力学性能要求。

ER110S, a kind of low-carbon steel welding wire alloy, which is processed by a traditional annealing, is often broken for the work-hardening in the follow-up drawing process. Through the microstrncture analysis of metal, raw materials after annealing have a large number of bainitic microstructure without continual distribution and carbide with dispersion distribution; by the application of DSC to re-determine the phase-change temperature of materials at Ac1, Ac3, through the testing of fully annealing process and re-crystallization annealing process, under the condition of keeping 700 ℃ for about 15 hours and with the furnace cooled to 300 ℃, released air-cooled, the re-crystallization annealing process is able to meet the performance requirements of the mechanical properties of drawing processing.