Heat Treatment Process Study for Improving Mechanical Properties of Low Carbon and Low Alloy Steel
Further development of Liuhua 11-1/4-1 oilfield project,which is under the responsibility of CNOOC Shenzhen Branch,is a national key project and a critical project for CNOOC to move towards deep waters.The cylindrical FPSO in this project adopts 12 deep water suction anchors,multi-point mooring,and a single set of suction anchors with a designed mooring load of 2 500 tons.The lifting lug made out of casting technology is a key and core component of the suction anchor,and is used for mooring anchor chain connection.This lug casting will experience complex operating conditions,and high technical requirements are required,with a classification of DNV,and it requires strict product quality.Previous projects have used products made by oversea casting steel manufacturers,which is a critical"bottleneck"product.In order to overcome the bottleneck technology,China National Offshore Oil Corporation(CNOOC)have organized domestic experts to conduct a review to fully promote China made equipment.This article focuses on mechanical properties research of the casting body out of A148 90-60 low alloy steel and the mechanical properties of the 395 large test block(395 mm×395 mm×395 mm),especially the properties of the core position.Through special heat treatment,the casting and 395 block have been improved to meet the design requirements.
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