Natural Gas
Natural gas occupies more and more important position in the world energy structure  as a clean and efficient energy. But with the exploration of world oil and gas resources, oil and gas on the superficial layer that is easy to exploit and have high purity is becoming less and less while it’s very difficult to exploit the deep oil and gas fields which contain high sulfur, chlorine ion and carbon dioxide and so on. Therefore, it is necessary to research, develop and produce oil well pipe and casing of high orrosion. 

   
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