一、前言普通商船船体结构采用高强度钢已有长久的历史史,当初主要是用于大型船舶的上甲板,其用量只占当时全部船体钢材的10～20％。目前,在强烈要求船舶节省能源的情况下,人们正以力图减轻船体重量作为节能采取的措施之一,因而,使高强度钢使用的量大约达到船体钢总量的70％。而且从以往使用屈服强度32公斤力/毫米~2级钢为主改变为目前的36公斤·力/毫米~2级高强度钢。 I. Introduction Ordinary merchant ships have a long history of using high-strength steels. Their structure is mainly used for the upper deck of large ships, accounting for only 10-20% of the total shipbuilding steel at that time. At present, one of the measures taken to reduce the weight of a ship as an energy-saving measure is being urgently required by the ship to save energy, thereby enabling the use of high-strength steel to about 70% of the total amount of steel in the ship. And from the previous use of yield strength of 32 kg / mm ~ 2 steel changed to the current 36 kg · force / mm ~ 2 high-strength steel.