绪论随着高速发展时期转向低速发展时期的过程中,对质量的要求,就进一步地严格起来。对于压力容器用钢来说,其原料坯的内部质量,也要求比原来具有更加好的强度、韧性、焊接性能以及耐回火脆化的特性等。本公司的水岛制铁所,压力容器用钢的初炼钢水是用转炉供给的,进而将其用钢包精炼炉(Ledle refining furnace=L.R.F)或RH除气装置进行处理,这在世界上还是唯一的一个工厂。因此,将其与以市售的钢屑为原料的电炉钢相 INTRODUCTION As the period of rapid development shifts to a period of low growth, the quality requirements are further tightened. For pressure vessel steel, the internal quality of its raw material billet, also requires better than the original strength, toughness, weldability and resistance to temper embrittlement characteristics. The Company’s Mishima Iron Works and pressure vessel steels are supplied with a converter primary converter which is then treated with a Ledle refining furnace (LRF) or RH degassing unit, Or the only one factory. Therefore, it is used with commercially available steel scrap as the raw material of the electric steel phase