锻压技术

冷轧低合金高强钢开发及应用

英文标题：Development and application for cold-rolled low-alloy high-strength steel

单位：（1.河钢汽车板有限公司天津 300308 2. 唐山钢铁集团有限责任公司河北唐山 063000 3.天津大唐国际盘山发电有限责任公司天津 301900）

分类号：TG335.12

出版年,卷(期):页码：2025,50(4):160-164

摘要：

摘要：为满足汽车工业对高强度、高加工性能材料的需求，开发了一种综合性能优良的HC420LA冷轧低合金高强钢。采用C-Mn-Nb-Ti复合微合金成分设计方法，结合优化的热轧及退火工艺制度，通过热模拟技术系统地研究了全工序中的加热温度、冷轧压下率、退火温度及退火速度等参数，确保了产品质量的稳定性。结果表明：开发的冷轧低合金高强钢的力学性能优异，屈服强度为433~492 MPa、抗拉强度为510~581 MPa、断后伸长率为18.5%～25.5%，完全满足汽车主机厂的加工要求。成品为铁素体单相组织，具有良好的组织变形能力，表现出优异的冷弯及扩孔性能。同时，成品组织中的带状结构主要源于再结晶不充分，通过提高退火温度、降低退火速度可有效降低各向异性，进一步优化材料性能。该研究为同类产品工业生产中工艺参数的制定提供了借鉴，有利于推动高强度钢的开发与应用。

Abstract: In order to meet the demand of automotive industry for high-strength and high processability materials， a cold-rolled low-alloy high-strength steel HC420LA with excellent comprehensive performance was developed. Then， by using the C-Mn-Nb-Ti composite microalloy composition design method and combining with the optimized hot rolling and annealing process system， the parameters of heating temperature， reduction rate of cold rolling， annealing temperature and annealing speed in the whole process were systematically studied by thermal simulation technology to ensure the stability of product quality.The results show that the developed cold-rolled low-alloy high-strength steel has excellent mechanical properties， with a yield strength of 433 to 492 MPa， a tensile strength of 510 to 581 MPa， and an elongation after fracture of 18.5% to 25.5%， which fully meets the processing requirements of automotive OEMs. The finished product is a ferrite single-phase structure with good structure deformation ability， showing excellent cold bending and hole expansion performance. At the same time， the banded structure in the finished product structure is mainly due to insufficient recrystallization. By increasing the annealing temperature and reducing the annealing speed， the anisotropy is effectively reduced， and the material performance is further optimized. Thus， this study provides a reference for the formulation of process parameters in the industrial production of similar products and is beneficial to promote the development and application of high-strength steel.

基金项目：

作者简介：尹树春（1980-），男，硕士，高级工程师

参考文献：

［1］高古辉，桂晓露，安佰锋，等. 终冷温度对Mn系超低碳HSLA钢组织及低温韧性的影响
［J］. 金属学报， 2015， 51(1): 21-30.

Gao G H，Gui X L，An B F，et al.The influence of the final cooling temperature on the microstructure and low-temperature toughness of Mn-based ultra-low carbon HSLA steel
［J］. Acta Metal. Sin.，2015， 51(1): 21-30.

［2］Sung H K， Shin S Y， Hwang B，et al.Effects of cooling conditions on microstructure， tensile properties， and charpy impact toughness of low-carbon high-strength bainitic steels
［J］.Metallurgical & Materials Transactions A， 2013， 44(1):294-302.

［3］Schino A D， Guarnaschelli C.Effect of microstructure on cleavage resistance of high-strength quenched and tempered steels
［J］.Materials Letters， 2009， 63(22):1968-1972.

［4］康华伟，张卫卫，尹翠兰. 260~420 MPa级汽车用冷轧低合金高强钢的生产过程能力分析
［J］. 金属世界， 2023(1): 71-74.

Kang H W，Zhang W W，Yin C L.Analysis of process capability for cold-rolled low-alloy high-strength steel for automotive use with yield strength of 260-420 MPa
［J］.Metal World， 2023(1): 71-74.

［5］陈俊，唐帅，刘振宇，等. 冷却方式对Nb-Ti微合金钢组织和性能及沉淀行为的影响
［J］. 金属学报， 2012， 48(5): 441-449.

Chen J，Tang S，Liu Z Y，et al.The effect of cooling method on the microstructure， properties and precipitation behavior of Nb-Ti microalloyed steel
［J］. Acta Metal. Sin.，2012， 48(5): 441-449.

［6］高永旭，杨跃标，褚晓红，等.退火工艺对Nb-Ti微合金化低合金高强钢组织性能的影响
［J］.钢铁研究学报，2023，35(4):454-461.

Gao Y X，Yang Y B，Chu X H，et al.Effect of annealing process on microstructure and properties of Nb-Ti microalloyed low alloy high strength steel
［J］.Journal of Iron and Steel Research， 2023， 35(4): 454-461.

［7］杨源远，魏晓东，黄利，等.冷轧HC340LA低合金高强钢的连续退火工艺研究
［J］.热加工工艺，2022，51(13):94-96，102.

Yang Y Y，Wei X D，Huang L，et al.Study on continuous annealing process of cold rolled HC340LA low alloy high strength steel
［J］. Hot Working Technology，2022，51(13):94-96，102.

［8］孔宁，杨迪，张杰，等.含磷高强钢板拉矫破鳞过程的氧化皮剥离机理
［J］.钢铁，2021，56(1):59-68.

Kong N，Yang D， Zhang J，et al.Peel mechanism of high strength steel plate containing phosphorus during tension correction of scale breakingl
［J］.Iron & Steel，2021，56(1):59-68.

［9］曹建国，江军，邱澜，等.新一代高技术宽带钢冷轧机全机组一体化板形控制
［J］.中南大学学报(自然科学版)，2019，50(7):1584-1591.

Cao J G，Jiang J，Qiu L，et al.A new generation of high-tech wide strip cold rolling mill integrated plate shape control
［J］.Journal of Central South University(Science and Technology)，2019，50(7):1584-1591.

［10］何平，王巍，李群芳，等.等温温度对Ti-Mo微合金高强双相钢相变及组织性能的影响
［J］.材料热处理学报，2024，45(8):146-153.

He P，Wang W，Li Q F，et al.Effect of isothermal temperature on phase transformation and microstructure properties of Ti-Mo microalloy high-strength duplex steel
［J］.Transactions of Materials and Heat Treatment，2024，45(8):146-153.

［11］陈浩炜，李吉航，战东平.冷作模具钢中碳化物控制技术的研究进展
［J］.钢铁研究学报，2024，36(7):827-843.

Chen H W，Li J H，Zhan D P.Research progress of carbide control technology in cold working die steel
［J］.Journal of Iron and Steel Research，2024，36(7):827-843.

［12］康涛，陈斌，赵征志，等.600 MPa级低合金高强钢的组织调控与工艺优化
［J］.中国冶金，2019，29(9):45-50.

Kang T，Chen B，Zhao Z Z，et al.Microstructure control and process optimization of 600 MPa grade low alloy high strength steel
［J］.China Metallurgy，2019，29(9):45-50.

［13］GB/T 228.1—2021，金属材料拉伸试验第1部分：室温试验方法
［S］.

GB/T 228.1—2021，Metallic materials—Tensile testing—Part 1: Method of test at room temperature
［S］.

服务与反馈：

【文章下载】【加入收藏】