The SP content in A516 GR70 was reduced, and the steel plates with different specifications were micro-alloyed with Nb or Nb, V and Ti, and were treated with A1 and Ca. The molten steel is purified by LF or LF+VD refining treatment; the controlled rolling and controlled cooling process is adopted for A516 GR70.
A516GR70 is mass-produced by normalizing process for thick steel plate, and the results show that the production process of A516GR70 steel plate for medium and low temperature pressure vessels is mature and feasible.
The performance indicators of the steel plate A516GR70 for medium and low temperature pressure vessels produced by this process and the performance of the samples after the simulated post-weld heat treatment test can fully meet the requirements of the standards and users, with high strength, good toughness, and excellent welding performance. The quality of A516 GR70 Stable and reliable, to meet the needs of users.
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