制管用420 MPa级低合金高强钢的成本优化  

Cost Optimization of 420 MPa Low Alloy High Strength Steel for Pipe Manufacturing

作　　者：白东明[1] Bai Dongming(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan Hebei 063000,China)

机构地区：[1]唐山钢铁集团有限责任公司,河北唐山063000

出　　处：《山西冶金》2025年第1期156-158,共3页Shanxi Metallurgy

摘　　要：针对唐钢2050线低合金高强钢Q420B成本较高的现状,采用中碳成分体系替代低碳成分体系,利用碳成分的间隙固溶强化作用大幅度提高产品力学性能,通过钛微合金化处理,并制定适宜的控轧控冷制度,以及对产品性能进行综合评价,使低成本Q420B产品上屈服强度在490 MPa以上,抗拉强度在610 MPa以上,屈强比在0.83左右,-60℃下冲击功在100 J以上,韧脆转变温度约为-13℃,组织为铁素体+珠光体,能够具备满足客户使用的综合性能。该试验钢工艺较原低碳成分体系吨钢成本降低约141元,显著降低了生产成本,对提高企业市场竞争力起到了有利作用。In response to the high cost of low alloy high-strength steel Q420A on the 2050 line,a medium carbon composition system is adopted to replace the low-carbon composition system.The gap solid solution strengthening effect of carbon composition is utilized to greatly improve the mechanical properties of the product.Through titanium microalloying treatment,a suitable controlled rolling and cooling system is formulated,and the product performance is comprehensively evaluated.The yield strength of the low-cost Q420A product is above 490 MPa,the tensile strength is above 610 MPa,the yield strength ratio is around 0.83,the impact energy at -60℃ is above 100 J,the ductile brittle transition temperature is about -13℃,and the microstructure is ferrite+pearlite,which can meet the comprehensive performance requirements for customer use.The experimental steel process has reduced the cost per ton of steel by about 141 yuan compared to the original low-carbon composition system,significantly reducing production costs and playing a beneficial role in improving market competitiveness.

关 键 词：中碳成分体系 钛微合金化 韧脆转变温度 综合性能 低成本 

分 类 号：TG335.1[金属学及工艺—金属压力加工]