A method for preparing stainless steel/pipeline steel composite plates for oil and gas transportation pipelines

Abstract

The invention discloses a preparation method of a stainless stee / pipeline steel composite plate for an oil-gas transport pipeline. The method comprises the following steps: 1. welding a metal block with a pipeline steel plate at a base layer, and welding a metal plate with a stainless steel plate at a composite layer; 2. polishing; 3. conducting explosive welding to prepare the composite plate; 4. selecting the qualified composite plate as a blank; 5. leveling; 6. cooling the surface of the pipeline steel plate at the base layer after thermal treatment; 7. after asymmetric rolling, sequentially leveling and cutting the blank to obtain the stainless steel and pipeline steel composite plate with the length being 6000-16000 mm, the width being 500-3000 mm and the thickness being larger than or equal to 10 mm. The preparation method disclosed by the invention utilizes the technologic process of combining the explosion composite method which is to lead the detonation point out of the board to be welded with the asymmetric rolling method to prepare the composite plate; the shear strength of the composite plate is higher than or equal to 190 MPa, so that the composite plate can be used as the material for the oil-gas transport pipeline with good market prospect.

Description

Technical field [0001] The invention belongs to the technical field of composite material preparation for oil and gas pipelines, and specifically relates to a method for preparing stainless steel / pipeline steel composite plates for oil and gas transportation pipelines. Background technique [0002] Since the oil and gas medium is flammable, explosive, easy to spread and has certain corrosiveness, whether it is the cast iron pipe used in the early days or the high-quality steel pipe commonly used today, oil and gas pipelines are prone to corrosion after a period of use, resulting in oil and gas pipelines Leakage or rupture accidents can easily lead to serious consequences such as personal injury, facility damage, and environmental pollution. In recent years, bimetallic composite pipes have begun to be tried in a small number of domestic oil and gas fields, but the technology is not yet mature. The methods used to produce the composite pipes generally have shortcomings such as...

AI Technical Summary

Problems solved by technology

[0002] Because the oil and gas medium is flammable, explosive, easy to spread and has a certain degree of corrosion, whether it is the cast iron pipe used in the early days or the high-quality steel pipe commonly used today, the oil and gas pipeline is easy to corrode after a period of use, resulting in oil and gas pipelines. Leakage or rupture accidents can easily lead to serious consequences such as personal injury, facility damage and environmental pollution.

In recent years, bimetallic composite pipes have been tried in a small number of oil and gas fields in China, but the technology is still immature. The general method of producing the composite pipes has defects such as low bonding strength and the length of the pipe blank can only be limited to a short range. The distance from large-scale application there are still some obstacles

[0003] In addition, although the current technology can roll some stainless steel / common carbon steel clad plates, the explosion + rolling process for stainless steel / pipeline steel, especially duplex stainless steel / pipeline steel clad plates, has not yet been developed.

Moreover, the combination of materials is difficult to roll, and strict process control measures must be taken, otherwise there will be problems such as poor surface or even cracks, and serious uneven deformation of the plate shape, which will make it impossible to continue rolling

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