Cold-rolled steel tube tail-cropping-free production technology

Abstract

The invention relates to a cold-rolled steel tube tail-cropping-free production technology and belongs to the technical field of steel tube production. The cold-rolled steel tube tail-cropping-free production technology comprises the steps of round steel cutting, intermediate frequency induction heating, perforating, spheroidizing annealing, semi-finished product straightening, cold rolling and finished product straightening. In the intermediate frequency induction heating step, the technical parameters of an intermediate frequency furnace are changed, wherein the heating power for the intermediate frequency furnace is changed to be 465-840 kw, and the feeding time is changed to be 240-411 s; temperature setting is changed, wherein the under-burnt temperature is changed to be lower than or equal to 1035 DEG C. Thus, the tail shrinkage degree of a tube opening of a billet tube is reduced, and the billet tube tail cropping procedure is omitted. By means of the production technology, the shrinkage degree of the steel tube tail tube is effectively reduced, the steel tube tail cropping procedure is omitted, the production cycle is shortened, and the production cost is saved.

Description

technical field [0001] The invention relates to the technical field of steel pipe production, in particular to a cutting-free production process for cold-rolled steel pipes. Background technique [0002] The production process of bearing steel pipes usually includes a tail cutting process. The main purpose of the tail cutting process is to remove the pipe tail shrinkage and adhered iron sheet to ensure the smooth progress of cold rolling production. Generally speaking, the diameter of the large end of the cold-rolled mandrel is smaller than the inner diameter When the inner diameter of the cold-rolled steel pipe tail is reduced by more than 3mm, if the tail is not cut, the steel pipe cannot pass through the large end of the cold-rolled mandrel, so that the cold-rolled production cannot be carried out smoothly. [0003] The tail cutting process itself needs a lot of man-hours, and a cutting machine is used, which consumes a lot of saw blades every month, which increases the p...

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Problems solved by technology

[0002] The production process of bearing steel pipes usually includes a tail cutting process. The main purpose of the tail cutting process is to remove the pipe tail shrinkage and adhered iron sheet to ensure the smooth progress of cold rolling production. Generally speaking, the diameter of the large end of the cold-rolled mandrel is smaller than the inner diameter When the inner diameter of the cold-rolled steel pipe tail is reduced by more than 3mm, if the tail is not cut, the steel pipe cannot pass through the big end of the cold-rolled mandrel, making the cold-rolled production unable to proceed smoothly

[0003] The tail cutting process itself requires a lot of man-hours, and a cutting machine is used, which consumes a lot of saw blades every month, which increases the production cycle and production cost

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