The effect of hot rolling process on the microstructure and properties of grade E microalloyed angle steel

LI Yanjie; TIAN Xiugang; YANG Yang; LI Zhe; ZHANG Chunhua; SUN Qiaomei; ZHANG Dazheng

doi:10.7513/j.issn.1004-7638.2025.06.017

Volume 46 Issue 6

Dec. 2025

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LI Yanjie, TIAN Xiugang, YANG Yang, LI Zhe, ZHANG Chunhua, SUN Qiaomei, ZHANG Dazheng. The effect of hot rolling process on the microstructure and properties of grade E microalloyed angle steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 138-146. doi: 10.7513/j.issn.1004-7638.2025.06.017

Citation:

LI Yanjie, TIAN Xiugang, YANG Yang, LI Zhe, ZHANG Chunhua, SUN Qiaomei, ZHANG Dazheng. The effect of hot rolling process on the microstructure and properties of grade E microalloyed angle steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 138-146. doi: 10.7513/j.issn.1004-7638.2025.06.017

Citation:

LI Yanjie, TIAN Xiugang, YANG Yang, LI Zhe, ZHANG Chunhua, SUN Qiaomei, ZHANG Dazheng. The effect of hot rolling process on the microstructure and properties of grade E microalloyed angle steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(6): 138-146. doi: 10.7513/j.issn.1004-7638.2025.06.017

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The effect of hot rolling process on the microstructure and properties of grade E microalloyed angle steel

doi: 10.7513/j.issn.1004-7638.2025.06.017

1.
Technical Center, Tangshan Iron and Steel Group Co., Ltd, Tangshan 063100, Hebei, China
2.
University of Science and Technology Liaoning, Anshan 114051, Liaoning, China

More Information

Received Date: 2025-08-07
Accepted Date: 2025-09-26
Rev Recd Date: 2025-09-01

Available Online: 2025-12-31

Publish Date: 2025-12-31

Abstract

Abstract

A systematic and multi-scheme simulation test was designed for grade E microalloyed angle steel. The effects of heating temperature, deformation temperature and cooling rate on microstructure and properties were clarified by analyzing the heating and growth law of original austenite, recrystallization of deformed austenite, phase transformation and precipitation of second phase particles. The results show that with the increase of heating temperature, the growth rate of original austenite grain size of slab depends on the heating temperature ranges, and the growth rate is relatively slow in the temperature range of 1125~1200 ℃. The austenite region is within 950~850 ℃. With the decrease of deformation temperature, the average grain size of ferrite decreases from 11.2 μm to 9.2 μm. When the deformation temperature is reduced to 800~750 ℃, the microstructure appears mixed grain, and some ferrite grains grow up to 13.6 μm. When the cooling rate is at 2~5 ℃/s, uniform ferrite+pearlite structure can be obtained. When the cooling rate reaches 10 ℃/s, the microstructure consists of cluster pearlite + reticular / acicular ferrite. Finally, the result of trial production at low temperature showed that the ferrite grain size was refined by about 30%, and the low temperature impact toughness was increased by about 20%.
- microalloyed angle steel,
- thermal simulation test,
- original austenite size,
- grain refinement,
- network ferrite,
- low temperature impact toughness

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References(30)

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