600HB hardness wear-corrosion-resistant steel plate used for slurry dredging pipes, and production method thereof

Abstract

The invention discloses a 600HB hardness wear-corrosion-resistant steel plate used for slurry dredging pipes, and a production method thereof. The 600HB hardness wear-corrosion-resistant steel platecomprises, by weight, 0.36 to 0.42% of C, Si<=0.01%, 1.6 to 2.0% of Mn, P<=0.015%, S<=0.005%, 0.2 to 1.0% of Al, 0.3 to 1.2% of Cr, 0.001 to 0.002% of B, N<=0.005%, one element or two elements selected from 0.01 to 0.03% of Nb or 0.01 to 0.025% of Ti, and the balance Fe and unavoidable impurities, wherein 6.65N<Nb+Ti<=0.045. Both the wear resistance and the corrosion resistance are taken into consideration in preparation; the 600HB hardness wear-corrosion-resistant steel plate possesses excellent wear resistance, and is mainly used for preparation of dredging pipes used in reclamation projectand navigation channel dredging; the corrosion resistance degree is 5 times of that of common pipes, so that dredging efficiency is increased greatly, and operation cost is reduced.

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 pipes with a hardness reaching 600HB 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 steel Q235B and Q345B pipelines under harsh working conditions is longer Short, even less than 1 year or scrapped. [0003] Wear-resistant steel such as Chinese Patent Publication No. CN103060689A discloses "a kind of preparation method of wear-resistant steel plate for mining...

AI Technical Summary

Problems solved by technology

A large number of carbide particles in the matrix play the role of "cathode" under the conditions of corrosion and wear, which promotes the occurrence of electrochemical corrosion, reduces the corrosion resistance, deteriorates the wear resistance of the material, and is difficult to meet the requirements of the slurry dredging environment. Large particle size, high content slurry abrasive requirements

[0005] Chinese Patent Publication No. CN101886225A (Comparative Patent 2) discloses "a corrosion-resistant and wear-resistant steel and its preparation method". This patent involves the addition of up to 0.4-0.9% C, 14-16% Mn, and Mo, Cr The content is all at 5-10%, and also contains a certain amount of rare elements such as Pr, Nd and Gd in addition, belongs to the high-alloy steel type, and the cost is very high; Lower bainite wear-resistant steel pipe for body transportation and its manufacturing method" and "a wear-resistant steel for slurry conveying welded pipe line and its manufacturing method" disclosed in Chinese Patent Publication No. CN103436790A (comparative patent 3), these two patents involve The steel types are all bainite or bainite + acicular ferrite structure, the tensile strength is only 600-800MPa, the hardness of the matrix is ​​not high, and it is mainly used in small-grained (tens of μm) slurry or crude oil transportation, etc. Under working conditions, it is not suitable for the transportation of large particles and high density seawater slurry

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