Toughness of welded joint and crack arrestability of base plate in ultra low C-2.5%Ni steel produced by thermo-mechanical control process.

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  • FURUKIMI Osamu
    High-technology Research Laboratories, Kawasaki Steel Corporation
  • NARUMOTO Asao
    Research Planning Dept., Technical Research Division, Kawasaki Steel Corporation
  • NAKANO Yoshifumi
    Mizushima Research Dept., Iron and Steel Research Laboratories, Kawasaki Steel Corporation
  • SHIGA Chiaki
    Iron and Steel Research Laboratories, Kawasaki Steel Corporation
  • TANAKA Tomoo
    Research and Development Center, Engineering Division, Kawasaki Steel Corporation

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説明

Using 2.5% Ni steel plates for LPG storage tanks, the effect of C content on crack initiation toughness of the fusion boundary of the MIG welded joint and the effects of processing conditions in controlled rolling and accelerated cooling on mechanical properties of base plate were investigated.<br>The experimental results indicated that the minimum crack initiation toughness of the welded joint was improved by decreasing C content. Furthermore, the crack arrestability of the 0.01%C-2.5%Ni steel plate was improved by reducing ferrite grain diameter and decreasing solute Nb. The ferrite grain was refined by lowering the slab repeating temperature and increasing the cooling rate after hot rolling. Refinement of ferrite grain made by increasing the cooling rate after hot rolling improved carck arrestability, even though solute Nb increased. On the basis of these experimental results, a 0.01%C-2.5%Ni steel plate with good crack arrestability in base plate and also good initiation toughness in welded joint was produced for LPG storage tanks using the thermo-mechanical control process.

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