Wear-resistant steel plate excellent in workability and manufacturing method thereof

Abstract

The present invention provides a wear-resistant steel plate with excellent bending workability suitable for use as a member in contact with soil and sand, such as a mechanical shovel, and a manufacturing method thereof. Specifically, it is a steel plate containing, by mass %: C: 0.05-0.35%, Si: 0.05-1.0%, Mn: 0.1-2.0%, Ti: 0.1-1.2%, Al: 0.1% or less, and Contains one or more of Cu: 0.1-1.0%, Ni: 0.1-2.0%, Cr: 0.1-1.0%, Mo: 0.05-1.0%, W: 0.05-1.0%, B: 0.0003-0.0030% , and DI* represented by the following formula is less than 60, and if necessary, one or two of Nb: 0.005-1.0% and V: 0.005-1.0% are contained, and the balance is composed of Fe and unavoidable impurities. DI*=33.85×(0.1×C*)0.5×(0.7×Si+1)×(3.33×Mn+1)×(0.35×Cu+1)×(0.36×Ni+1)×(2.16×Cr+ 1)×(3×Mo*+1)×(1.5×W*+1)…(1), where C*=C-1 / 4×(Ti-48 / 14N), Mo*=Mo× (1-0.5×(Ti-48 / 14N)), W*=W×(1-0.5×(Ti-48 / 14N)).

Description

technical field [0001] The present invention relates to a wear-resistant steel plate (abrasion resistant steel) and a manufacturing method thereof, in particular to a wear-resistant steel plate with excellent bending formability. The wear-resistant steel plate is suitable for use in construction and civil engineering. ), industrial machines such as power shovels, bulldozers, hoppers, buckets, and transporting machines used in fields such as mining It is used for parts where wear or abrasion caused by contact with earth and sand becomes a problem. Background technique [0002] For components subject to wear such as soil and sand, steel materials with excellent wear resistance are used for longer life. It is known that the abrasion resistance (abrasion resistant property) of steel is improved by increasing the hardness. Therefore, parts requiring abrasion resistance are made of high-strength steel by heat treatment such as quenching and other alloying elements such as Cr and ...

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Problems solved by technology

[0012] However, in the technology described in Japanese Patent No. 3089882, since the quenching heat treatment is performed, the structure becomes a quenched martensitic structure (martensitic structure), so the strength is improved, and as a result, the deformation resistance (deformation resistance) during bending is improved. , so it is difficult to say that bending is easy, and there is a problem in bending workability

[0013] In the technology described in Japanese Patent Application Laid-Open No. 4-41616, in order to ensure bending workability, the surface hardness is specified as 401 or less by Brinell hardness meter, but due to the large amount of alloying elements added, the tensile strength exceeds 780MPa. From the viewpoint of load reduction, it is not necessarily possible to achieve sufficient bending workability

[0014] In addition, the wear-resistant steel plates described in Japanese Patent Application No. 62-142726, Japanese Patent Application No. 63-169359, Japanese Patent Application No. 1-142023, and Japanese Patent Application No. 4-41616 must be implemented. Heat treatment has problems in terms of manufacturing time limit and production cost

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