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一、前言在加氢、裂化等炼油设备中,广泛使用Cr5Mo 钢制做临氢管线、热油转油线及加热炉炉管。由于该类管道工作在高温、高压、腐蚀性强的恶劣条件下,近年来炼油厂有关 Cr5Mo 钢管焊接接头断裂引起的事故报导已有多起,为此对该类管道施工过程中的质量,必须予以足够的重视,确保装置设备的安全运行。Cr5Mo 钢管的焊接,通常采用的两个方案见表1。二、焊接接头的硬度试验和金相分析将采用两种不同方案焊接的试件(以下称采用方案 A 焊接的试件为接头 A,采用方
First, the preface In the hydrogenation, cracking and other oil refining equipment, the extensive use of Cr5Mo steel to do Pro hydrogen pipeline, hot oil transfer line and furnace tube. Due to the high temperature, high pressure and corrosive conditions of such pipelines, there have been many reports from refineries about the accidents caused by the rupture of welded joints of Cr5Mo steel pipes in recent years. For this reason, the quality during the construction of such pipelines must be reported Sufficient attention should be paid to ensure the safe operation of the equipment. Cr5Mo steel pipe welding, two programs are usually used in Table 1. Second, the hardness test and metallographic analysis of welded joints will use two different programs welded specimen (hereinafter referred to as the program A welded specimen for the joint A, using the square