No.18 April 2013 - Special Issue on "Steel Products for Energy Industries" and "Steel Sheets for Automotive and Electric Machinery and Appliance"

Steel Plates with Excellent HAZ Toughness for Offshore Structures

YUGA Masao       HASHIMOTO Masayuki       SUZUKI Shinichi


JFE Steel has developed high strength steel plates for offshore structures, which meet the low temperature specification. The range of products has expanded corresponding to the rising demand for the steel used for the offshore structure arising form robust oil resource development in recent years. Excellent properties of the plates and their welded joints are obtained by micro-alloying technology, and latest controlled rolling and accelerated cooling technology using Super-OLACTM (On-Line Accelerated Cooling). High strength steel plates which are designed for excellent weldability thorough the low weld cracking parameter PCM value have been developed by Super-OLACTM for up to 550 MPa class in yield stress, up to 101.6 mm in thickness with 420 MPa class in yield strees, and satisfying −40°C of crack tip opening displacement (CTOD) temperature specificetion for offshore structure. They have achieved already a lot of actual application results.

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