Transactions of Materials and Heat Treatment

Title：Cracking analysis and quality control in forming process for cold heading steel SWRCH22A

Authors： Lyu Gang Zhou Leyu Tao Ya Zhao Xiaomin

Unit： Steel Union Co. Ltd. of Baotou Steel (Group) Corp. Beijing Research Institute of Mechanical and Electrical Technology Ltd.

KeyWords： cold heading drawing cracking casting blank crack SWRCH22A

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2018,43(10):117-121

Abstract：

The cold heading cracking and drawing fracture phenomena of SWRCH22A cold heading steel wire rod in the process of application were analyzed. The experiment results show that the cold heading cracking defects of screw are obviously related to the line defects on the surface of wire rod, which is caused by the subcutaneous and corner cracks of the casting blank produced by the continuous casting process to form lines of about 200 μm depth on the surface of wire rod and closed microcracks near the surface after the subsequent rolling. However, the fracture presents pen tip shape in the drawing process, and there is coarse pearlite colony of about 20-30 μm in the center of fracture due to the central segregation of the casting blank. Furthermore, the systematic analysis and control were carried out by controlling the smelting, continuous casting and rolling processes. Combining with the optimization and improvement of production technology, the quality of SWRCH22A cold heading steel wire rod is greatly improved to meet the user′s requirements.

Funds：

北京市重大科技成果转化落地培育（Z161100004816013）

吕刚（1983-），男，硕士，高级工程师，E-mail：lvgang218@163.com

Reference：

[1]陈宏，曾立，喻黄海，等.SWRCH22A冷镦钢的冶炼工艺实践[J].首钢科技，2010,(5):42-45.

Chen H, Zeng L，Yu H H, et al. Smelting practice of cold heading steel SWRCH22A[J]. Shougang Science and Technology,2010, (5):42-45.

[2]唐修昌，游光明，阮细保，等.SWRCH22A冷镦钢的开发与生产[J].江西冶金，2009, 29(1):1-4.

Tang X C, You G M, Ruan X B, et al. Development and production of SWRCH22A cold heading steel[J]. Jiangxi Metallurgy, 2009, 29(1):1-4.

[3]安守福，李贵平，张育新，等.SWRCH22A高铝钢转炉LF炉冶炼酸溶铝含量控制的工艺优化[J].河北冶金，2011, (7):33-36.

An S F, Li G P, Zhang Y X, et al. Process optimization of acid-dissolved aluminum content control for SWRCH22A high-alumina steel[J]. Hebei Metallurgy, 2011, (7):33-36.

[4]GB/T 6478—2015,冷镦和冷挤压用钢[S].

GB/T 6478—2015, Steels for cold heading and cold extruding[S].

[5]帅习元，郑云峰，陈洪伟.冷镦钢盘条表面一种特殊线状缺陷形成原因分析[J].物理测试，2007, 25(4):32-35.

Shuai X Y, Zheng Y F, Chen H W. Analysis on origination of special surface lineal defect in cold heading rod[J]. Physics Examination and Testing, 2007, 25(4):32-35.

[6]张步海，于同仁，詹学义，等.冷镦钢线材表面裂纹形成原因分析[J].金属制品，2004,30(3):23-26.

Zhang B H, Yu T R, Zhan X Y, et al. Analysis on forming reason of surface crack of cold heading steel wire rod[J].

Metal Products, 2004,30(3):23-26.

[7]华蔚.ML20MnTiB冷镦钢开裂原因分析[J].金属热处理，2010,35(1):117-119.

Hua W. Crack analysis of ML20MnTiB cold heading steel[J]. Heat Treatment of Metals, 2010, 35(1):117-119.

[8]郭亮.SWRCH22A标准件用钢试制[J].包钢科技，2000, (6):35-39.

Guo L. Developing of SWRCH22A standard part steel[J]. Science & Technology of Baotou Steel, 2000, (6):35-39.

[9]李慧峰.冷镦钢产品顶锻开裂的机理分析及应用[J].锻压技术，2006, 31(2):34-37.

Li H F.Mechanical analysis of cold heading steel product cracks and its application in production[J]. Forging & Stamping Technology, 2006, 31(2):34-37.

[10]张萍，孙宜强，陈方玉.冷镦钢冷镦开裂原因分析[J].武钢技术，2007,45(6):24-27.

Zhang P, Sun Y Q, Chen F Y. Analysis on reason of cold heading crack of cold heading steel wire rod[J]. Wuhan Iron and Steel Corporation Technology,2007,45(6):24-27.

[11]胡桂英，赵有朋，廖达清，等.SWRCH22A冷镦钢盘条开裂原因探讨[J].江西冶金，2012, (3):15-18.

Hu G Y, Zhao Y P, Liao D Q, et al. Cracking analysis of SWRCH22A cold heading steel rod[J]. Jiangxi Metallurgy, 2012, (3):15-18.

[12]姚罡，李伟强，庄宝潼.一种钛合金螺栓头部镦锻裂纹的失效分析[J].锻压技术，2017, 42(5):129-131.

Yao G，Li W Q，Zhuang B T. Failure analysis on upsetting crack for titanium alloy bolt head[J]. Forging ＆ Stamping Technology，2017, 42(5):129-131.

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