Anti-acid pipeline clad steel plate with corrosion resistance and manufacturing method of anti-acid pipeline clad steel plate

Abstract

The invention discloses an anti-acid pipeline clad steel plate with corrosion resistance. The anti-acid pipeline clad steel plate with corrosion resistance comprises a carbon steel base layer and stainless steel cladding composited with the carbon steel base layer in a rolled manner. The stainless steel cladding is austenitic stainless steel. The carbon steel base layer comprises chemical elementsincluding, by mass percent, 0.02%-0.05% of C, 0.6%-1.20% of Mn, 0.30%-0.50% of Cr, 0.06%-0.12% of Nb, 0%-0.50% of Ni, 0.005%-0.02% of Ti, 0.05%-0.45% of Si, 0.01%-0.05% of Al, 0.001%-0.003% of Ca, and the balance Fe and other unavoidable impurities. The invention further discloses a manufacturing method of the anti-acid pipeline clad steel plate with the corrosion resistance. The anti-acid pipeline clad steel plate with the corrosion resistance can meet the using requirement of pipes of a welded pipeline in mechanical performance and welding performance and also has the high corrosion resistance, and the performance requirement of an anti-acid pipeline clad steel plate product can be met without heat treatment.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a composite steel plate and a manufacturing method thereof. Background technique [0002] In some oil and gas mining areas with harsh conditions, the produced highly corrosive oil and gas containing a mixture of multiple components, such as high concentrations of H 2 S, CO 2 Wait. At this time, ordinary low-alloy line steel pipes cannot meet these CO 2 Delivery of highly corrosive gases. If a stainless steel pipe with high corrosion resistance is used, on the one hand, the construction cost of the pipeline is very expensive, on the other hand, it is difficult for stainless steel to meet the high-strength mechanical performance requirements of the pipeline, and the welding construction is difficult. [0003] In order to obtain the above-mentioned high-corrosion-resistant pipeline steel pipes, people usually use mechanical composite pipeline steel pipes at pre...

AI Technical Summary

Problems solved by technology

However, the technical solution disclosed in this patent document cannot guarantee that stainless steel has good corrosion resistance

[0007] To sum up, the existing problems in the prior art are: for hot-rolled clad steel plates for acid-resistant pipelines, it is necessary to maintain the corrosion resistance of the stainless steel layer, and to ensure that the carbon steel substrate has acid resistance and corresponding strength, low temperature Impact toughness and low temperature drop weight tear (DWTT) performance, which is difficult in the production process

Because stainless steel and carbon steel have to be rolled together, and when rolled at a temperature below 880 ° C, Cr in stainless steel will precipitate in the form of carbides, resulting in local Cr deficiency in the stainless steel structure, thereby reducing the intergranular corrosion performance; but at 880 ° C Rolling at a temperature above ℃, carbon steel will be difficult to effectively refine the structure due to high temperature rolling, so that the impact toughness and DWTT performance of the composite steel plate substrate will be greatly reduced, which does not meet the technical requirements of the pipeline

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