High-hardness wear-resistant corrosion-resistant steel plate for slurry dredging and production method thereof

Abstract

The invention provides a high-hardness wear-resistant corrosion-resistant steel plate for slurry dredging and a production method thereof. The steel plate comprises, by weight, 0.18 to 0.24% of C, nomore than 0.01% of Si, 1.3 to 1.6% of Mn, no more than 0.015% of P, no more than 0.005% of S, 0.2 to 1.0% of Al, 0.3 to 1.2% of Cr, 0.001 to 0.002% of B, no more than 0.005% of N, and one or more selected from a group consisting of 0.01 to 0.03% of Nb and 0.01 to 0.025% of Ti, with the balance being Fe and unavoidable impurity elements, wherein the sum of Nb and Ti is more than 6.65 N and no morethan 0.045. The composition design of the wear-resistant corrosion-resistant steel plate allows the steel plate to have both corrosion resistance and wear resistance; and the steel plate is mainly applied to manufacturing of dredging pipelines applied to reclamation of land from water, navigation channel dredging and other fields and has wear and corrosion resistance two times higher than the wearand corrosion resistance of conventional common pipes, so dredging efficiency is greatly improved and operation cost is lowered.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, in particular to an abrasion-resistant steel plate for slurry dredging and a production method thereof. Background technique [0002] In land reclamation, channel dredging, embankment maintenance and other operations, a large amount of solid particles such as sand and gravel are transported in the form of slurry for long distances through dredging pipelines. Abrasion and the interaction between the two, especially when the seawater slurry contains weathered rocks, coral reefs, and medium-coarse sand, the abrasion of the pipe body is more serious. The service life of ordinary Q235B and Q345B pipelines under harsh working conditions is longer Short, even less than 1 year or scrapped. [0003] Wear-resistant steel such as "a wear-resistant steel plate with low crack sensitivity index and high strength and its preparation method" disclosed in Chinese Patent Publication No. CN103397272A, ...

AI Technical Summary

Problems solved by technology

However, a large number of carbide particles in the matrix act as a cathode in an abrasive environment, which promotes the occurrence of electrochemical corrosion and increases the abrasive weight loss of the material. Therefore, although the steel plate has good wear resistance, the wear resistance is not good.

[0005] Chinese Patent Publication No. CN101886225A (Comparative Patent 2) discloses "a kind of corrosion-resistant and wear-resistant steel and its preparation method". 16% Mn, and the content of Mo and Cr is 5-10%. In addition, it also contains a certain amount of rare elements such as Pr, Nd and Gd. CN102776445A (comparative patent 1) discloses "a kind of wear-resistant lower bainite steel pipe for slurry transportation and its manufacturing method" and Chinese patent publication number CN103436790A (comparative patent 3) discloses "a kind of wear-resistant Steel and its manufacturing method”, these two patents involve the steel types are bainite or bainite + acicular ferrite structure, the hardness of the matrix is ​​not high, the tensile strength is only 600-800MPa, mainly used in fine particle ( Slurry or crude oil transportation of tens of μm) is not suitable for the field of large particle and high density seawater slurry transportation

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