Vl4-4l marine steel plate with good low temperature toughness and its manufacturing method

Abstract

The invention discloses a VL4-4L steel plate for ships with good low temperature toughness and a manufacturing method thereof. C: 0.04%-0.09%; Si: 0.05%-0.14%; Mn: 1.10%-1.45%; S: ≤0.002%; P: ≤0.008%; Als: 0.015% to 0.045%; N: 0.003% to 0.015%; Nb: 0.01% to 0.03%; Cu: 0.05% to 0.15%; Cr: 0.05% to 0.20%; Ni: 0.25% ~0.50%; V: 0%~0.04%; Ti: 0.008%~0.014%; the balance is Fe and inevitable impurities. It can meet the technical requirements of marine steel plates in harsh and harsh environments.

Description

technical field [0001] The invention belongs to the field of steel material preparation, in particular to a VL4-4L marine steel plate with good low temperature toughness and a manufacturing method thereof. Background technique [0002] In recent years, the global demand for LPG energy has continued to grow, and the demand for LPG storage and transportation has become increasingly strong. The scale of LPG transport ships is constantly developing in the direction of large-scale. The large-scale development of VLGC puts forward higher requirements for the safety and stability of ships in service. Therefore, not only the requirements for ship design and construction process are more stringent, but also for the production and quality stability control belts of low-temperature steel plates required for shipbuilding. to great difficulty. [0003] C-Mn series low-temperature steel plates for LPG ships are mainly used for the construction of cargo tanks and surrounding hull structu...

AI Technical Summary

Problems solved by technology

At present, this kind of products are produced by TMCP process at home and abroad. In order to ensure the low temperature performance requirements, it is necessary to strictly control the heating temperature of the billet, the rolling temperature and the rapid cooling process after rolling, and the production is extremely difficult.

Images