Abstract: The phase transformation point and continuous cooling transformation ( CCT) curves of SWRH82B steel (/% : 0.80C, 0.84Mn, 0.22Si, 0.013P, 0.008S, 0.32Cr) are measured by thermal simulation machine, and the effect of cooling rate ( 1~25℃/s) on phase transformation structure, pearlite interlamellar spacing and mechanical properties of SWRH82B rod coil is analyzed by optical microscope, SEM, TEM and mechanical testing to get the optimum cooling rate 8~10℃/s. The commercial production test is carried out by 150 mm x 150 mm billet of SWRH82B steel rolled to Φ13 mm rod coil and fan cooling with four Z₁~Z₁₃ cooling roller speed (0.8~1.25 m/s, 1.0~1.45 m/s, 1.05~1.50 m/s and 1.10~1.55 m/s) and cooling rate (8.9, 9.5 , 10.4 and 11.2 ℃/s) , and it is obtained that in order to get optimum cooling rate 8 ~ 10 ℃/s at Stelmor cooling line the roller speed of first section should be 0.8~1.0 m/s to come up to the required index of user： aged tensile strength 1130 MPa and reduction of area ≥30% , sorbitic structure ratio ≥80% and depth of surface decarburization ≤1.5%D (D- diameter of rod coil).

Key words: Φ13 mm Rod Coil, SWRH82B Steel, Controlling Cooling Process, Phase Transformation Structure, Roller Speed of First Section, Mechanical Properties

摘要： 采用热模拟试验机测定了SWRH82B钢（/%:0.80C，0.84Mn，0.22Si，0.013P，0.008S，0.32Cr）的相变点和连续冷却转变（CCT）曲线，通过金相显微镜、SEM、TEM及力学性能测试分析了冷却速度（1~25℃/s）对SWRH82B线材相变组织、珠光体片层间距和力学性能的影响，得到了最佳冷却速度为8~10℃/s；通过150 mm×150 mm SWRH82B钢铸坯轧成Φ13 mm盘条后风冷4组Z₁~Z₁₃辊道速度（0.8~1.25 m/s，1.0~1.45 m/s，1.05~1.50 m/s，1.10~1.55 m/s）和冷却速度（8.9,9.5,10.4,11.2℃/s）进行了生产试验，得出在斯泰尔摩风冷线上的获得最佳冷却速度8~10℃/s首段辊道速度应为0.8~1.0 m/s，可达到用户要求的指标:时效后抗拉强度≥1130MPa和断面收缩率≥30%，索氏体率≥80%，表面脱碳深度≤1.5%D（D-线材直径）。

关键词: Φ13 mm线材, SWRH82B钢, 控冷工艺, 相变组织, 首段辊道速度, 力学性能