FIELD: machine engineering.
SUBSTANCE: steel tube with an inner plastic shell comprising lugs consisting of sleeves made of carbon steel and shells made of corrosion-resistant steel, which are fixed the ends of plastic shell inside ends of a steel pipe from the end faces of the steel pipe between the sleeves and the shells are placed rings made of corrosion -resistant steel width not exceeding the width of a carbon steel sleeves.
EFFECT: invention reduces the consumption of corrosion-resistant steel in the manufacture of pipes with an internal plastic coating to ensure the safety of the quality of the weld steel pipes with an inner plastic shell.
2 cl, 2 dwg
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