| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.17 ( October 1987 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Properties of 390- and 415-MPa Yield Strength Steel Plates with Good Toughness in Large Heat Input Welded Joints Yoshifumi Nakano, Keniti Amano, Yoshifumi Sannomiya, Eiji Kobayashi, Takao Ogawa, Hiroshi Yajima |
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Synopsis : Ship structural 390 MPa yield strength (YP 40 kgf/mm2) steels and an offshore structural 415 MPa yield strength (YP 42 kgf/mm2) steel were developed to assure good low temperature toughness in large heat input welded joints. They were produced using MACS (Multipurpose accelerated cooling system) with low N and a small amount of Nb and REM-Ti addition for the YP 390 MPa steels and with low C, medium Mn, low N, and small amounts of Nb and REM-Ti addition for the YP 415 MPa steel. Tensile, Charpy impact and fracture mechanics tests proved that the steel plates and their welded joints made by electro-gas welding and one-side one-pass submerged arc welding with heat inputs of 147 to 274 kJ/cm had sufficient properties for ship and offshore structures. |
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