800 MPa level thick steel plate with high toughness and low yield ratio and its making process

@inproceedings{2006800ML,
  title={800 MPa level thick steel plate with high toughness and low yield ratio and its making process},
  author={刘俊亮 and 吴开明 and 姚连登},
  year={2006}
}
800MPa grade high toughness, low yield ratio steel plate, the mass percentage having a composition: C 0.05 ~ 0.09, Si 0.35 ~ 0.55, Mn 1.50 ~ 1.90, Ni 0.30 ~ 0.70, Nb 0.04 ~ 0.08, Al 0.02 ~ 0.04, Ti 0.01 ~ 0.04 , remainder Fe and unavoidable impurities, the steel tissue dominated by acicular ferrite and martensite composition, wherein the ratio of martensite is 10 to 30%. The present invention employs a steel Mn-Nb-Ni-Ti-based component, low alloy content, low production cost, less weld cracking… CONTINUE READING