Rectangular steel pipe processing technique

Abstract

The invention discloses a rectangular steel pipe processing technique. The technique is characterized by including following steps: a, checking defects of an incoming steel pipe; b, pickling; c, phosphating, and taking out for drying; d, saponifying, and taking out for drying; e, using a cold drawing machine for cold drawing to obtain a cold-drawn pipe; putting the cold-drawn pipe in heating equipment for heating; g, diameter-fixing and shaping the cold-drawn pipe after heating; h, performing end cutting, inspecting and defect detecting on the cold-drawn pipe after diameter fixing; i, preheating before cutting, namely adopting a flame burning gun for heating to enable the whole interface of a steel pipe to be heated uniformly; j, adopting laser for low-speed cutting; k, performing low-temperature tempering immediately after cutting. The rectangular steel pipe processing technique has the advantages that treatment expense is low, and treatment efficiency and workpiece quality are improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a rectangular steel pipe processing technology. Background technique [0002] Rectangular tube is a hollow square cross-section light-weight thin-walled steel tube, also known as cold-bent steel profile. It is a steel with a square cross-section shape and size made of Q235A hot-rolled or cold-rolled strip or coil as the base material, which is cold-bent and then high-frequency welded. Except for the thickened wall thickness of the hot-rolled extra-thick-walled square tube, the corner size and edge straightness reach or even exceed the level of the resistance-welded cold-formed square tube. At present, the cold processing method commonly used for rectangular pipes is a cold-drawn process pipe, which has low compressive capacity, poor processing performance, low quality of internal and external surfaces, low strength, insufficient toughness, and cracks ea...

AI Technical Summary

Problems solved by technology

At present, the cold processing method commonly used for rectangular pipes is a cold-drawn process pipe, which has low compressive capacity, poor processing performance, low quality of internal and external surfaces, low strength, insufficient toughness, and cracks easily; One adopts cold rolling process, its production efficiency is low, and the crack problem is the most likely to appear in the processing process and the most difficult to deal with