锻压技术

高成形性精密制冷焊管钢ZLG1的研制

英文标题：Development of precision refrigerating welded tube steel ZLG1 with high formability

作者：王乐

分类号：TG335.12

出版年,卷(期):页码：2024,49(8):103-109

摘要：

基于超低C、Nb+Ti复合并添加B的经济型成分设计，通过洁净钢冶炼、低温加热、轧后急冷、高温卷取、酸轧大压下、中温连续退火、在线轻平整等工艺技术，实现了精密制冷焊管钢的稳定化工业生产。结果表明，研制的精密制冷焊管钢的微观组织主要为均匀、细小且近似等轴的铁素体，同时,铁素体晶界周围稀疏分布粗大的、近似方形的Ti（CN）复合粒子和椭球形的TiS粒子，两类粒子的数量较少且尺寸约为0.4～2.0 μm，由此促进了{111}再结晶有利织构的生长，从而保证了钢带优异的拉拔成形性能。研制的精密制冷焊管钢ZLG1的屈服强度为130～162 MPa，断后伸长率为46.5%～57.0%，塑性应变比为2.16～2.98，加工硬化指数为0.240～0.287，具有良好的综合力学性能和广阔的应用潜力。

Based on the economic component design with ultra-low C, Nb+Ti composite and adding B,the stable industrial production of precision refrigerating welded tube steel has been achieved through the process technologies such as clean steel smelting, low-temperature heating, rapid cooling after rolling, high-temperature coiling，acid rolling with high reduction, medium temperature continuous annealing, online skin passing. The results show that the microstructure of the developed precision refrigerating welded tube steel is mainly homogeneous, fine and near-equiaxed ferrite. Moreover, there are coarse, approximately square Ti(CN) composite particles and ellipsoidal TiS particles around ferrite grain boundaries, with a small number of particles and the size of about 0.4-2.0 μm,both of which promote the generation of the favorable texture {111} for recrystallization and assure the excellent drawing properties of steel strip. The developed precision refrigerating welded tube steel ZLG1 has a good comprehensive mechanical prcperties and broad application potential with the yield strength of 130-162 MPa，the elongation after fracture of 46.5%-57.0%，the plastic strain ratio of 2.16-2.98，and the work hardening exponent of 0.240-0.287.

基金项目：

作者简介：王乐（1987-），男，硕士，高级工程师 E-mail：453218905@qq.com

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