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Journal of Iron and Steel Research International

, Volume 22, Issue 12, pp 1144–1148 | Cite as

Newly Designed Cr-Mn Alloyed Ultra-high Strength Steel without Boron Addition for Hot-stamping Processing

  • Guo-hui ZhuEmail author
  • Hong-bing Zhou
  • Qin-yi Li
  • Qi-wei Chen
  • Hai-rong Gu
  • Yong-gang Liu
Material

Abstract

A newly designed hot-stamping steel alloyed by chromium (Cr) and manganese (Mn) without boron (B) addition was developed for automobile mass reduction. The experimental results showed the Cr-Mn alloyed steel could be quenched to full martensite microstructure when the cooling rate was higher than 14 °C /s. Yield strength, tensile strength and elongation of the experimental hot stamping part reached 1180 MPa, 1 645 MPa and 8.4%, respectively. The experimental hot stamping part possessed higher tensile strength and elongation, compared with conventional hot-stamping steel of 22MnB5. Furthermore, excellent processing flexibility would be obtained in this novel hot-stamping steel because of its lower critical cooling rate and phase transformation temperature. The design of the composition and investigations of microstructure, mechanical properties and hot-stamping processing were also studied.

Key words

hot-stamping ultra-high strength steel finite element method mechanical property 

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Copyright information

© China Iron and Steel Research Institute Group 2015

Authors and Affiliations

  • Guo-hui Zhu
    • 1
    Email author
  • Hong-bing Zhou
    • 1
  • Qin-yi Li
    • 1
  • Qi-wei Chen
    • 1
  • Hai-rong Gu
    • 2
  • Yong-gang Liu
    • 2
  1. 1.Anhui University of TechnologyMa’anshan, AnhuiChina
  2. 2.Ma’anshan Iron & Steel Company LimitedMa’anshan, AnhuiChina

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