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由法国引进的30万千瓦锅炉机组的主蒸汽管道,其规格为φ340×37毫米,工作温度为540～545℃,工作压力为189.1公斤/厘米~2。管道材质为F12钢(X20CrMoV121),这是西德产的合金含量较高的马氏体高强度的新钢种。它的焊接性较差,对焊接工艺要求较高,为了保证焊接质量,对主蒸汽管道提出的主要技术要求是:管子对接坡口形式采用双V型坡口,接头根部加衬垫(可熔环);焊接时先用手工钨极氩弧焊打底,随后用手工电弧焊焊满焊缝,同时管内充氩保护焊根;焊工要经过培训,考试合格者才能参加正式工程的施工;焊
The main steam pipe of the 300,000-kilowatt boiler unit imported from France has the specification of φ340 × 37mm, the working temperature of 540 ~ 545 ℃ and the working pressure of 189.1kg / cm ~ 2. Pipe material for the F12 steel (X20CrMoV121), which is produced in West Germany high alloy content martensite high strength of the new steel. Its poor weldability and high requirements on the welding process. In order to ensure the welding quality, the main technical requirements for the main steam pipe are as follows: the pipe-butt groove adopts the double V-groove and the root of the joint is padded Ring); welding first with a manual TIG primer, followed by manual arc welding full of welds, while the argon tube to protect the root welding; welders to be trained, the exam pass to participate in the formal construction of the project; welding