秦凤婷, 王红伟, 董战利, 等. 冷却速度对Φ13 mm SWRH82B线材组织性能影响及控冷工艺优化实践[J]. 特殊钢, 2016,37(5):40-44.
秦凤婷, 王红伟, 董战利, et al. Effect of Cooling Rate on Structure and Properties of Φ13 mm SWRH82B Rod Coil and Optimized Practice of Controlled Cooling Process[J]. Special Steel, 2016, 37(5): 40-44.
秦凤婷, 王红伟, 董战利, 等. 冷却速度对Φ13 mm SWRH82B线材组织性能影响及控冷工艺优化实践[J]. 特殊钢, 2016,37(5):40-44.DOI:
秦凤婷, 王红伟, 董战利, et al. Effect of Cooling Rate on Structure and Properties of Φ13 mm SWRH82B Rod Coil and Optimized Practice of Controlled Cooling Process[J]. Special Steel, 2016, 37(5): 40-44.DOI:
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Z
1
~Z
13
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)。
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 Z
1
~Z
13
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).