| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.29 ( November 1993 ) Special Issue on Iron Power ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| 420 MPa and 500 MPa Yield Strength Steel Plates with High HAZ Toughness Produced by TMCP for Offshore Structures Osamu Tanigawa, Hiroaki Ishii, Noritsugu Itakura, Keniti Amano, Yoshifumi Nakano, Fumimaru Kawabata |
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Synopsis : Steel plates for offshore structures with satisfactory welded joint toughness were produced by both continuous casting and thermo-mechanical control processes. These plates were 101.6 mm thick with YP 420 MPa for large structures, 60 mm thick with YP 420 MPa for arctic use, and the 50 mm thick with YP 500 MPa. The chemical composition of the steel plates was appropriately designed to improve the HAZ toughness. The Pcm values for these plates were less than 0.20%, which enabled welding without preheating. Submerged arc welded joints with a heat input ranging from 3 to 4.5 kJ/mm showed sufficient CTOD values of more than 0.4 mm at -10. The CTOD value of the steel plate for arctic use welded with heat input of 5 kJ/mm was also above 0.4 mm at -50. |
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