低碳海洋平台用钢E40-Z35的研制

通过实验室热模拟实验确定工艺参数,开发了连铸坯生产海洋平台用钢E40-Z35的控轧控冷工艺,并进行了现场工业试制.结果表明:采取低碳(w(C)≈0.08%)微合金化成分设计,利用Ca球化处理MnS夹杂物,以及轧制过程中进行高温慢速大压下,未再结晶区开轧温度为900℃,终轧温度为800℃,终冷温度为640℃左右.热轧后产品的-40℃常规冲击和时效冲击吸收功高于200J,厚度方向断面收缩率高于45%,具有良好的抗层状撕裂性能,满足船级社对海洋平台用钢E40-Z35的要求.

On the Low-Carbon Plate Steel E40-Z35 for Offshore Platform

With TMCP (thermo-mechanical control process) parameters determined via hot simulation in lab, the plate steel E40-Z35 for offshore platform was developed and put into pilot-scale production. The results showed that the TMCP includes the characteristics as follows: low carbon content (about 0.08wt%) in microalloying composition design; Ca-spheroidization for MnS inclusions; heavy reduction during the hot-rolling process at high temperature and low speed; starting and finishing the rolling process in non-recrystallized zone at 900 ℃ and 800 ℃ respectively, with workpiece finally cooled at about 640 ℃ ; the work done for absorbing conventional and ageing impact acting on the products after hot rolling at - 40 ℃ is higher than 200 J; the area reduction along thickness is higher than 45% ; high laminar tearing strength. All of these illustrates that the plate steel prepared meets the requirements of any classification societies for the use of offshore platforms.