Trial-production and phase transformation rule of X120 pipeline steel

ZHENG Yue-qiang,TANG Xing-chang,LI Ji-peng,WANG Yun-ping

Journal of Iron and Steel Research ›› 2015, Vol. 27 ›› Issue (2) : 45-49.

Journal of Iron and Steel Research ›› 2015, Vol. 27 ›› Issue (2) : 45-49. DOI: 10.13228/j.boyuan.issn1001-0963.20140368

Trial-production and phase transformation rule of X120 pipeline steel

  • ZHENG Yue-qiang,TANG Xing-chang,LI Ji-peng,WANG Yun-ping
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Abstract

X120 pipeline steel was trial-produced at a laboratory and the continuous cooling transformation (CCT) curves of it were drawn. The results indicate that the steel as-rolled has average yield strength of 905MPa, average tensile strength of 980MPa, average elongation of 17%, Rp0. 2/Rm of 0. 92 and average impact energy of 90J at -20℃. After tempered for 2h at 600℃, the steel has average yield strength of 950MPa, average tensile strength of 1000MPa, average elongation of 18%, Rp0. 2/Rm of 0. 95 and average impact energy of 95J at -20℃. After compression, the microstructure of the steel cooled at 5℃/s is lath bainite which is ideal microstructure of X120 pipeline steel.

Key words

X120 pipeline steel / microstructure / mechanical property / CCT

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ZHENG Yue-qiang,TANG Xing-chang,LI Ji-peng,WANG Yun-ping. Trial-production and phase transformation rule of X120 pipeline steel[J]. Journal of Iron and Steel Research, 2015, 27(2): 45-49 https://doi.org/10.13228/j.boyuan.issn1001-0963.20140368

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