极寒环境下厚规格船舶用钢的发展

北极地区能源和贸易航线潜力、南极地区科考行动等受到越来越多的关注,促进了大型高技术极寒环境下服役船舶的需求和发展,同时对满足极寒环境服役条件船舶用低温钢的各项性能提出了更高的要求,厚规格、具有优异低温韧性和易焊接的更高强度级别的极寒环境下船舶用低温钢是今后的发展趋势。介绍了国内外船舶用低温钢的发展状况和低温钢的成分、生产工艺特点,建议采用低碳当量成分设计的新TMCP工艺技术路线,应用纳米相强韧化理论并控制其组织构成,从而实现优异的低温强韧性和止裂性能。

Development of heavy ship plate in extremely cold environment

The potential of energy,trade routes in the Arctic region and the scientific exploration in the Antarctic have been attracted more and more attention.It has promoted the demand and development of service ships in large and high technology in extremely cold environment.At the same time,higher requirements were put forward for the performance of cryogenic steels used in ships with extremely cold environment.And the cryogenic steel used in ships under extreme cold conditions,with thick specifications,excellent toughness at low temperature and easy welding,is the trend of development in the future.The development of cryogenic steel using for ships at home and abroad was introduced as well as the composition of low temperature steel and its technological characteristics.At last the NG- TMCP process route was proposed by using low carbon equivalent components.The theory of strengthening and toughening of nano- phase was applied to control the composition of the microstructure,so as to achieve excellent low temperature toughness and crack arrest performance.