Development and Strengthening Mechanism of 420MPa Grade Bridge Steel with High Toughness

doi:10.12068/j.issn.1005-3026.2018.08.012

Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (8): 1123-1126.DOI: 10.12068/j.issn.1005-3026.2018.08.012

• Materials & Metallurgy • Previous Articles Next Articles

Development and Strengthening Mechanism of 420MPa Grade Bridge Steel with High Toughness

GAO Cai-ru¹， LIU Bao-xi²， PAN Huan¹， GAO Xiu-hua¹

1.State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. Technology Center， Tangshan Iron and Steel Group，Tangshan 063002， China.

Received:2017-04-12 Revised:2017-04-12 Online:2018-08-15 Published:2018-09-12
Contact: GAO Cai-ru
About author:-
Supported by:
-

Abstract

Abstract: The Q420 bridge steel with yield strength of 480~ 530MPa， tensile strength of 560~ 630MPa， elongation of 21 %~ 25% and impact strength of more than 200J at-20℃was developed by optimization of alloy composition and improvement of control rolling and control cooling process. The amount of various types of strengthening contribution was obtained through analyzing the amount of precipitation by transmission electron microscopy and the grain size of metallographic microstructure. Then the strengthening mechanism of Q420 bridge steel was studied. The results showed that the contribution of precipitation strengthening accounts for less than 10% of the total strength for Q420 bridge steel， and the contribution of solid solution strengthening and fine grain strengthening are 54% and 36%，respectively.It is confirmed that solid solution strengthening and fine grain strengthening are dominated in 420MPa grade steel.

Key words: control rolling and control cooling, high toughness, 420MPa grade bridge steel, strengthening mechanism, strength calculation

CLC Number:

GAO Cai-ru， LIU Bao-xi， PAN Huan， GAO Xiu-hua. Development and Strengthening Mechanism of 420MPa Grade Bridge Steel with High Toughness[J]. Journal of Northeastern University Natural Science, 2018, 39(8): 1123-1126.

References

[1]Komizo Y.Recent progress in steels for bridge and line pipe［C］// Asia Steel International Conference 2006.Fukuoka，Japan:The Iron and Steel Institute of Japan，2006:140-145.
[2]Guo J，Shang C J，Yang S W，et al.Weather resistance of low carbon high performance bridge steel［J］.Materials & Design，2009，30(1):129-134.
[3]Tewary N K，Kundu A，Nandi R，et al.Microstructural characterization and corrosion performance of old railway girder bridge steel and modern weathering structural steel ［J］.Corrosion Science，2016，113:57-63.
[4]Guo J，Shang C J，Yang S W，et al.Effect of carbon content on mechanical properties and weather resistance of high performance bridge steels ［J］.Journal of Iron and Steel Research，International，2009，16(6):63-69.
[5]桥梁用结构钢:GB/T 714—2015［S］.北京:中国标准出版社，2015.(Structural steel for bridges:GB/T 714—2015［S］.Beijing:China Standard Press，2015.)
[6]Wang L，Gao C R，Liu X H，et al.Effect of TMCP parameters on the microstructure and properties of Q460qNH steel［J］.Journal of Wuhan University of Technology(Materials Science Edition)，2009，24(6):917-921.
[7]Zhang H L，Johansson B，Ahuja R，et al.First-principles study of solid-solution hardening in steel alloys［J］. Computational Materials Science，2012，55:269-272.
[8]王有铭，李曼云，韦光.钢材的控制轧制和控制冷却［M］.北京:冶金工业出版社，1995:4-8.(Wang You-ming，Li Man-yun，Wei Guang.Controlled rolling and controlled cooling of steel ［M］.Beijing:Metallurgical Industry Press，1995:4-8.)
[9]雍岐龙.钢铁材料中的第二相［M］.北京:冶金工业出版社，2006:44-47.(Yong Qi-long.The second phase in steel ［M］.Beijing:Metallurgical Industry Press，2006:44-47.)
[10]Takaki S，Kawasaki K，Kimura Y.Mechanical properties of ultra fine grained steel ［J］.Journal of Materials Processing Technology，2011，117:359-363.

Development and Strengthening Mechanism of 420MPa Grade Bridge Steel with High Toughness

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 6

Recommended Articles

Metrics

Comments

[1]	QI Xiang-yu， ZHU Xiao-lei， HU Jun， DU Lin-xiu. Production Technology of Low-C Medium-Mn Q690F High Strength and Toughness Mid-Thick Steel Plate [J]. Journal of Northeastern University Natural Science, 2019, 40(4): 483-487.
[2]	WANG Xue-qiang， ZHAO Jin-hua， YUAN Guo， WANG Guo-dong. Microstructural Evolution and Strengthening Mechanism of X65 Pipeline Steel Processed by Ultra-fast Cooling [J]. Journal of Northeastern University Natural Science, 2019, 40(3): 334-339.
[3]	LI Cheng-ning， YUAN Guo， KANG Jian， WANG Guo-dong. Effect of Asymmetric Hot Rolling on Microstructure and Mechanical Properties in Low Alloy Steel [J]. Journal of Northeastern University Natural Science, 2017, 38(7): 941-945.
[4]	QI Xiang-yu， ZANG Miao， HU Jun， DU Lin-xiu. V-N Microalloying Q550D High-Strength Mid-Thick Steel Plate [J]. Journal of Northeastern University Natural Science, 2017, 38(4): 502-506.
[5]	CUI Chen-shuo， GAO Cai-ru， SU Guan-qiao， GAO Xiu-hua. Strengthening and Toughening Mechanism of Hot-Rolled Low Carbon Vanadium Steel [J]. Journal of Northeastern University Natural Science, 2017, 38(3): 341-345.
[6]	HU Jun， DU Linxiu， WANG Wanhui， LI Jing. Microstructural Control and Mechanical Properties of 590MPa Grade HotRolled VN High Strength Steel [J]. Journal of Northeastern University, 2013, 34(6): 820-823.