| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.13 ( September 1985 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Structural Steel Plates for Arctic Use Produced by Multipurpose Accelerated Cooling System Yuji Kusuhara, Eiji Kobayashi, Fumihiro Ohnishi, Ikuo Hirai, Keniti Amano, Ryo Tarui |
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Synopsis : Arctic use of the YP 36kgf/mm2 class structural steel plate for high heat input welding was developed by using Multipurpose Accelerated Cooling System (called "MACS") which was established in April 1983 at Mizushima Works, Kawasaki Steel Corp. The characteristics of the steel (32 min in thickness) are summarized as follows: (1) Fracture appearance transition temperature at middle thickness in the transverse direction was lower than -100, the COD value (Βc) at -60 was higher than 1.0 mm, and the corresponding temperature to a crack arrest toughness (Kca) of 600 kgf/mm3/2 was -60. It can be concluded from the above that the material has sufficient resistively to brittle crack initiation and crack initiation and crack propagation. (2) At both one-side two-pass and two-side one-pass welding joints with high heat input, VE-60 was more than 7 kgf m at any notch position and Βc at -60 notched on the fusion line was 0.3 mm or more. (3) The preheating temperature for crack prevention was confirmed to be below 0 by the y-groove, large scale fillet restraint weld cracking test. |
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