Method for combining carbon steel-based stainless steel internal composited tube

Abstract

The invention discloses a compounding method of a carbon steel-based stainless steel inside clad tube, which belongs to the technical field of fluid transmission pipe manufacturing. The invention aims to provide a compounding method which is capable of maintaining the advantages and overcoming the disadvantages of stainless steel tubes and significantly reducing the cost. The technical proposal includes the following steps that: one end of a stainless steel tube is inserted into a carbon steel tube, wherein, the outside diameter of the stainless steel tube is slightly smaller than the inside diameter of the carbon steel tube, the stainless steel tube is longer than the carbon steel tube, and the diameter of the other end of the stainless steel tube is expanded by a hydraulic flaring machine; the carbon steel tube is gripped by a hydraulic gripper; the cold drawbench is started up to push the internal mold, whose largest working outside diameter is a slightly larger than the inside diameter of the carbon steel tube, into the stainless steel tube from the expanded end, and the internal mold is towed by the mandrel in the cold drawbench to execute spiral beeline movement of forward rotary extrusion until coming out of the other end of the stainless steel tube; here, the carbon steel-based stainless steel inside clad tube is produced. The compounding technique of the invention has the characteristics of easy operations, good compounding effect, low power consumption and high speed.

Description

technical field [0001] The invention relates to a composite method for a carbon steel-based stainless steel inner composite pipe, and belongs to the technical field of fluid conveying pipeline manufacturing. Background technique [0002] Fluid conveying pipelines are known as "the blood vessels of modern industry, national defense and national economic construction". Stainless steel, as the name suggests, is a kind of steel that is not easy to rust. The reason why it is stainless and corrosion-resistant is that a chromium-rich oxide film is formed on its surface, which prevents the chemical reaction between iron elements and oxygen in the air, thereby maintaining stainless steel. It has a series of outstanding advantages such as excellent corrosion resistance, brightness and luxury, easy forming, compatibility, and strength and toughness in a wide temperature range. Therefore, for a long time, stainless steel materials have been used in light and heavy and defense industries...

AI Technical Summary

Problems solved by technology

[0003] However, the price of seamless thick-walled pure stainless steel pipe or thin-walled pure stainless steel welded pipe is very expensive, about 70,000-90,000 yuan / ton

Not only that, due to the defects of welding technology and the inherent plasticity of stainless steel pipes, pure stainless steel pipes are easy to be crushed, bent and deformed, and even major accidents such as leakage, corrosion, and bursting may occur.