A large diameter alloy seamless steel pipe production process.
It includes the following steps: Step one, material preparation; step two, tube heating and oblique rolling perforation; step three, trimming of the capillary; step four, thermal expansion deformation sizing; step five, heat treatment; step six, straightening; step seven , Inner grinding; Step eight, correction; Step nine, grinding; Step ten, inspection inspection; Step XI, and then finishing, final inspection and packaging. The invention can not only produce high-grade alloy seamless steel pipes within the range of large groups, but also has relatively small investment, high product quality, high production efficiency and low production cost.
The main production process of seamless steel tubes Tube billet and billet heating, perforation of tube blanks, extension of steel tubes, rolling of steel tubes, sizing and reducting of steel tubes, cooling and finishing of steel tubes, or thermal perforation of steel blanks Zinc acid washed cold drawn carbon burning cut head spray packaged product.
A method for producing a seamless steel pipe, characterized in that a rolling stand having a plurality of rolls and a plurality of mandrel type seamless rolling mills continuously arranged in mutually different rolling directions are provided in such a production line After the seamless steel pipe is rolled, the wall thickness in the circumferential direction of the rolled steel pipe is measured at a plurality of points, and based on the measurement results, at least the final rolling stands of the mandrel mill are respectively controlled. Both ends of each axis of the roll are positioned to minimize wall thickness unevenness.
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