1) To reduce the SP content in A516 GR70, the steel plates of different specifications are micro-alloyed with Nb or Nh V and Ti, and AI treatment and Ca treatment are carried out.
2) Purify A516 GR70 molten steel by LF or LF+VD refining treatment.
3) When rolling A516 GR70, the controlled rolling and controlled cooling process is adopted to give full play to the role of Nb, V, Ti, AI microalloying elements, and the method of fine grain strengthening and precipitation strengthening is adopted to improve the strength and toughness of A516 GR70.
4) Normalizing is used for thick specification A516 GR70 to make the structure uniform and eliminate residual stress.
5) A516 GR70 samples are subjected to simulated post-weld heat treatment according to customer requirements to ensure that A516 GR70 still has sufficient strength and toughness after on-site high temperature tempering.
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