How the insolation joints welded?

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Insulation joints are mainly used in the sealing protection…

What is the material of N80 in N80 oil casing?

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N80 petroleum casing and N80 seamless steel pipe are important…

Basic matters of oil casing

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Chemical composition(1)According to SY/T6194-96. The same steel…

The great role of oil casing

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In the past, when oil extraction was carried out, simple mechanical…

What’s the oil casing used for?

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Oil casing can be divided into different steel grades according…

Classification and use of oil casing

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Surface casing1、Used to seal the upper unstable loose, collapse-prone…