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1.前言 低温与常温的界限一般并不明确,但对压力容器等设备来讲,则把低于-10℃的低温环境下使用的材料称为低温材料。近年来,随着各种液化气体需要量的增加,由于低温材料能用于各种化工装置及液化气体贮藏设备,故特别引人注目。而且,随着与材料低温特性有关的断裂力学的进展,低温材料的标准也已先后作了制定或修正。但是,各种有关标准的适应性仍有问题,因此有必要按今后的实际使用经验和研究成果来加以完善。本文就JIS及WES(日本焊接协会标准)所规定的材料种类
1. Introduction The boundary between low temperature and normal temperature is generally not clear, but for pressure vessels and other equipment, the materials used in low temperature environment below -10 ℃ are called low temperature materials. In recent years, with the increase of various liquefied gas requirements, cryogenic materials have drawn particular attention since they can be used in various chemical plants and liquefied gas storage facilities. Moreover, with the development of fracture mechanics related to the low-temperature properties of materials, the standard of low-temperature materials has also been formulated or revised successively. However, the adaptability of various relevant standards is still problematic. Therefore, it is necessary to improve them according to actual practical experience and research achievements in the future. This document is based on JIS and WES (Japan Welding Association standards) the type of material