Bi-metal metallurgical bonding composite seamless pipe blank production process and device

Abstract

The invention belongs to the technical field of composite pipe production processes, and particularly relates to a bi-metal metallurgical bonding composite seamless pipe blank production process. Thebi-metal metallurgical bonding composite seamless pipe blank production process comprises the following steps that S1, raw materials are prepared, specifically, outer-layer hollow materials and inner-layer materials are prepared; S2, preheating is conducted, specifically, the outer-layer hollow materials are preheated; S3, slag is fused, specifically, pre-slag is put into the outer-layer hollow materials and is heated and fused; S4, metallurgical bonding is conducted, specifically, the inner-layer materials extend into the outer-layer hollow materials, and are heated and fused to be combined with the outer-layer materials; and S5, a pipe blank is obtained, specifically, after the inner-layer materials are fused, cooling is conducted and the metallurgical bonding composite metal pipe blankis obtained. A bi-metal composite pipe is produced in the mode of blank metallurgical compounding and hot continuous rolling, a base layer and a composite layer of a finished steel pipe are combined in a metallurgical mode, the intensity of the combined layer is high and is equivalent to the intensity of base metal, and the common problem of inner-layer stripping of mechanical composite pipes is avoided.

Description

technical field [0001] The invention belongs to the technical field of composite pipe production technology, and in particular relates to a bimetallic metallurgy combined composite seamless pipe blank production technology and a device thereof. Background technique [0002] Steel pipes for engineering require not only excellent mechanical, physical and chemical properties, but also long service life and low price. Although metallurgical methods such as adding alloying elements and heat treatment can improve or improve certain characteristics of materials, adding expensive and rare alloying elements cannot always obtain the desired ideal properties. With the further development of metal material processing technology, bimetallic composite pipe came into being. [0003] When the bimetallic composite pipe is applied to oil and gas pipelines: since the composite pipe is composited by a simple mechanical method, there is a gap between the bonding surface of the base pipe and the...

AI Technical Summary

Problems solved by technology

The centrifugal casting method can ensure the strength of the pipeline, but its biggest disadvantage is that it needs to machine the surface of the tube billet, which increases the uneven wall thickness of the two layers of metal, and will also form due to the mutual erosion and mixing of liquid metal during casting. transition layer

The process is complicated, the efficiency is low, the finished product rate is low, and the cost is high

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