Economical low-temperature steel pipe with good corrosion resistance and manufacturing method of economical low-temperature steel pipe

Abstract

The invention provides an economical low-temperature steel pipe with good corrosion resistance and a manufacturing method of the economical low-temperature steel pipe. The steel pipe is prepared fromthe following components in percentage by weight: 0.09%-0.12% of C, 0.25%-0.33% of Si,1.10%-1.29% of Mn, 0.015%-0.03% of Ti, 0.01%-0.024% of Al, less than or equal to 0.012% of P, less than or equal to 0.008% of S, wherein the carbon equivalent CE<Pcm> is less than or equal to 0.22, and the formula of CE<Pcm>=(C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B) is met. The manufacturing method comprises the steps of converter smelting, external refining (LF), square billet continuous casting, entering a heating furnace after cooling to the room temperature, pipe billet continuous rolling, reheating, continuous rolling for pipe manufacturing, sizing and heat treatment. By applying the economical low-temperature steel pipe with the good corrosion resistance and the manufacturing method of the economical low-temperature steel pipe, low-temperature impact performance and acid corrosion resistance of the steel pipe are improved, and the steel pipe can be used in a low-temperature environment ofminus 45 DEG C and a hydrogen sulfide corrosion environment.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an economical low-temperature steel pipe with good corrosion resistance and a manufacturing method thereof. Background technique [0002] In recent years, with the progress of the petrochemical industry, energy development in alpine regions has been increasing. At the same time, the development of new equipment and new technologies has also promoted the updating and improvement of liquefaction, separation, storage and transportation equipment. Therefore, the development of low-temperature pipeline products used in low-temperature fluid delivery pipelines, low-temperature pressure vessels, and petrochemical equipment has begun to receive widespread attention. In the past, low-temperature steel pipe products often added a large amount of alloying elements, such as Ni and Mo, to reduce their ductile-brittle transition temperature, and the cost was relatively high. High, the wide appli...

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Problems solved by technology

[0007] Invention "A Low-Temperature Seamless Steel Tube for Freezing Construction and Its Manufacturing Method" (Application No.: 201210092191.X) added alloying elements such as V to the technical solution disclosed, and did not adopt a heat treatment process. The range of elements is wide, which is not conducive to product performance Stability, and the low-temperature impact performance at -60°C is not described, and the product does not involve corrosion resistance research. The current complex use environment puts forward higher requirements for corrosion resistance

In the product development of the ASTM A333 Gr6 seamless steel pipe for low temperature service, the product is added with various alloys such as V and Mo, which has high cost and a wide range of product element components, which is not conducive to operation.

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