Transactions of Materials and Heat Treatment

Title：Development of precision refrigerating welded tube steel ZLG1 with high formability

Authors： Wang Le

Unit： Iron and Steel Research Institute Shandong Iron and Steel Group Rizhao Co. Ltd.

KeyWords： cold rolling welded tube steel continuous annealing ferrite Ti(CN) composite particle TiS particle

ClassificationCode：TG335.12

year,vol(issue):pagenumber：2024,49(8):103-109

Abstract：

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.

Funds：

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

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