Effect of final rolling temperature on microstructure and properties of 500 MPa grade vanadium microalloyed high-strength steel

HAN Chufei; DONG Yi; SHI Xiaoguang; SUN Chengqian; WANG Junxiong; LI Zhi; XU Haijian

doi:10.7513/j.issn.1004-7638.2026.04.018

Volume 47 Issue 4

Aug. 2026

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HAN Chufei, DONG Yi, SHI Xiaoguang, SUN Chengqian, WANG Junxiong, LI Zhi, XU Haijian. Effect of final rolling temperature on microstructure and properties of 500 MPa grade vanadium microalloyed high-strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 151-156. doi: 10.7513/j.issn.1004-7638.2026.04.018

Citation:

HAN Chufei, DONG Yi, SHI Xiaoguang, SUN Chengqian, WANG Junxiong, LI Zhi, XU Haijian. Effect of final rolling temperature on microstructure and properties of 500 MPa grade vanadium microalloyed high-strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 151-156. doi: 10.7513/j.issn.1004-7638.2026.04.018

Citation:

HAN Chufei, DONG Yi, SHI Xiaoguang, SUN Chengqian, WANG Junxiong, LI Zhi, XU Haijian. Effect of final rolling temperature on microstructure and properties of 500 MPa grade vanadium microalloyed high-strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 151-156. doi: 10.7513/j.issn.1004-7638.2026.04.018

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Effect of final rolling temperature on microstructure and properties of 500 MPa grade vanadium microalloyed high-strength steel

doi: 10.7513/j.issn.1004-7638.2026.04.018

HAN Chufei^{1, 2, 3
,},
DONG Yi^{1, 2},
SHI Xiaoguang^{1, 2},
SUN Chengqian^{1, 2},
WANG Junxiong^{1, 2},
LI Zhi^{1, 2},
XU Haijian^{1
,
,}

1.
Anshan Iron & Steel Co., Ltd., Anshan 114009, Liaoning, China
2.
State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan 114021, Liaoning, China
3.
Shenyang University of Technology, Shenyang 110023, Liaoning, China

More Information

Received Date: 2026-02-19
Accepted Date: 2026-03-31
Rev Recd Date: 2026-03-25
Publish Date: 2026-08-31

Abstract

Abstract

In this research, low C-Mn-V-Cr-Nb composite microalloyed steel with a yield strength of 500 MPa was designed to meet the requirements of lightweight and high-performance materials in fields such as automotive, shipbuilding, and energy transmission. The effects of different final rolling temperatures (FRT, 920, 870, 820℃and 770 ℃) on the precipitates, microstructural characteristics, strength and toughness of 500 MPa grade high-strength steel were investigated. The -40 ℃ CVN impact energy and room temperature tensile test were performed. The microstructural characterization of the 500 MPa grade microalloyed steels with different final rolling temperatures were observed by using optical microscopy (OM), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results showed that with FRTs decreasing, grain size of the steel gradually refines during rolling in the unrecrystallized austenite zone. The volume fraction of V-rich nano carbonitrides inside the grain show a trend of firstly increasing and then decreasing. At the same time, the microstructure gradually evolved from polygonal ferrite (PF) and a small amount of acicular ferrite (AF), granular bainite (GB) to quasi polygonal ferrite (QF), AF and GB. Both strength and −40 ℃impact toughness of the steel are improved. Taking into account performance requirements and shape control during the rolling process, the FRT of 820-870 ℃ can produce the performance which meets the technical requirements for steel used in engineering equipments.
- precipitates,
- high-strength steel,
- vanadium microalloying,
- final rolling temperature,
- strength and toughness

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References(17)

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