中Cr超纯铁素体不锈钢SUS 444及B445J1M的焊接技术.pdfVIP

中 Cr 超纯铁素体不锈钢 SUS 444 及 B445J1M 的焊接技术 许海刚 王治宇 韩 俭 余海峰 (宝山钢铁股份有限公司 宝钢股份研究院，上海 201900) 1 摘 要 介绍了宝钢生产的中Cr 超纯铁素体不锈钢SUS 444、B445J1M 材料的性能及其焊接特点。防止接头脆化 及耐蚀性下降是焊接关键技术。通过采用焊缝熔池保护、适当的热输入控制等措施，对SUS 444、B445J1M 进行焊 接。对焊后接头进行微观组织、力学性能、腐蚀性能及成形性能对比分析，发现两者焊缝接头都具有良好的综合性 能。实践证明，焊后接头表面钝化，能进一步提高焊缝耐腐蚀性能。 关键词 超纯铁素体不锈钢 SUS 444 B445J1M 焊接 力学性能 腐蚀性能 成形性能 Welding Technique of Midium-Cr Ultra-pure Ferritic Stainless steel of SUS 444 and B445J1M Xu Haigang Wang Zhiyu Han Jian Yu Haifeng （Research and Development Center, Baoshan Iron Steel Co., Ltd., Shanghai, 201900 ） Abstract The material performance and weldability of midium-Cr ultra-pure ferritic stainless steel of SUS 444 and B445J1M produced by Baosteel was introduced in this paper. There were key techniques to prevent welding crispy and corrosion in the weld joint. And welding tests were conducted on plates of SUS 444、B445J1M through measures which includes the weld pool protecting by shielding gas and heat input control, then microstructure, mechanical property, corrosive property and forming property of joints were analyzed, results show that good comprehensive property of joints can be obtained. In the mean time, practice shows that passivation of joints can further increasing corrosion resistance. Key words ultra-pure ferritic stainless steel, SUS 444, B445J1M, welding, mechanical property, corrosive property, formability 随着冶炼技术的进步，C、N 含量的降低，出现了超纯铁素体不锈钢。明显地提高了铁素体不锈钢的耐 腐蚀性、韧性。而且，超纯铁素体不锈钢的出现扩展了铁素体不锈钢的应用领域，以其不含镍可以显著降低 成本的特点，不仅在某些用途中取代碳钢，而且在许多苛刻的工况下可替代奥氏体不锈钢。 宝钢生产的SUS 444 和B445J1M 两种牌号的超纯中铬铁素体不锈钢，具有良好的耐氯离子腐蚀、耐应 力腐蚀能力及良好的成形性和焊接性。它们在实际应用中以冷轧板形式为主，SUS 444 目前主要用于各种水 处理装置，而B445J1M 为宝钢独有产品，相对于SUS 444，含有更高的Cr 和更低的Mo ，成本更低，但仍 具有