贮罐和压力容器用高性能厚板的开发

为了满足能源领域的需求，JFE公司开发了高性能即韧性、强度和焊接性都优良的610MPa级高强度系列钢板，包括高焊接性的JFE—HITEN610U2、低温贮罐用JFE—HITEN610U2L和大输入热量焊接用JFE—HITEN610E。这些产品的特点是低C、低Pcm（焊接裂纹敏感性成分）和不加入B。由于采用了微合金化技术和超级在线快速冷却（Super—OLAC）的直接淬火—回火工艺，从而获得了优良的母材及焊缝性能。另外，针对市场对高可靠性超厚钢板的需求，开发了采用锻造、轧制工艺和高质量连铸板坯生产超厚钢板的技术，在压力容器用SQV2B板和200mm厚度级别的超厚板生产中，实现了优良的内部质量；且这些产品都有了较多的应用实绩。

Development of High Performance Steel Plates for Tanks and Pressure Vessels

JFE Steel has developed a series of high performance 610 MPa class HSLA steel plates with excellent weldability (consisting of JFE-HITEN610U2 with high weldability,JFE-HITEN610U2L for low temperature use and JFE-HITEN610E for high heat input welding).Excellent properties of the plates and their weldments are brought about by the microalloying technology and a direct-quenching and tempering process using Super-OLAC(on-line accelerated cooling),while including low C content,low Pcm value and free of B additive.JFE steel has also developed a process for manufacturing heavy section steel plates with ecellent internal qualities by effecting forging and plate rolling processes using continuous-cast slabs.Excellent internal properties can be obtained in the manufacture of heavy section SQV2B and 200 mm thick plates.They have actual application results to many plants.