Different types of steel pipe would be used for different engineering project. Therefore, before the installation of the seamless steel pipe or ERW steel pipe, we should have a research for the installation environment. Thus, we can choose the rightful steel pipe for the project. Today, we would take line steel pipe for example to give customers explanation. Line pipe steels used in sour service are prone to hydrogen-induced cracking (HIC) depending on metallurgical and environmental factors. Thus, our first goal is to check the environment factors and decide the type of steel pipe. Whatâ??s more, the metallurgical factors consist of alloying elements, micro-structure, strength, segregation, and shape of non-metallic inclusions. Some environmental factors which influence HIC, also known as stepwise cracking (SWC). Thus, we should get well for the partial pressures and other factors like temperature, PH and so on. All of the research would lead you to the right steel pipeâ??s choice.