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Abrasion-resistant steel sheet having excellent processability, and method for production thereof

A technology of excellent workability, wear-resistant steel plate, applied in the field of wear-resistant steel plate and its manufacturing, can solve the problems of not necessarily bending workability, improvement, manufacturing period, manufacturing cost, etc., to reduce heat treatment costs and improve bending processing. performance, shortening the manufacturing period

Active Publication Date: 2010-03-31
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Abrasion-resistant steel sheet having excellent processability, and method for production thereof
  • Abrasion-resistant steel sheet having excellent processability, and method for production thereof
  • Abrasion-resistant steel sheet having excellent processability, and method for production thereof

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Effect test

Embodiment

[0095] The molten steel with the composition shown in Table 1 is melted in a vacuum melting furnace to form a small steel ingot (50kg) (steel raw material), and then heated to 1050-1250°C for hot rolling to make it into a steel plate with a thickness of 6-100mm. Test plate. Microstructure observation, tensile test (tensile test), abrasion test, Charpy impact test (Charpy impact test), and bending test (bend test) were performed on each test steel plate.

[0096] (organization observation)

[0097] After grinding the test piece for tissue observation, it was etched with nital, and the structure was identified using an optical microscope (magnification ratio: 400 times) at a position 1 mm below the surface layer, and ferrite grains were measured. diameter (ferrite grain diameter) and the size and number of hard phases. In addition, in the observation field of view, the structure accounting for more than 90% is used as the matrix phase, and the size of the hard phase is the ave...

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Abstract

An abrasion resistant steel excellent in bending formability and suitable for members, e.g., power shovels, which come into contact with earth and sand, and a production method thereof are provided. Specifically, the steel contains, on a percent by mass basis, 0.05% to 0.35% of C, 0.05% to 1.0% of Si, 0.1% to 2.0% of Mn, 0.1% to 1.2% of Ti, 0.1% or less of Al, at least one element of 0.1% to 1.0%of Cu, 0.1% to 2.0% of Ni, 0.1% to 1.0% of Cr, 0.05% to 1.0% of Mo, 0.05% to 1.0% of W, and 0.0003% to 0.0030% of B, if necessary at least one element of 0.005% to 1.0% of Nb and 0.005% to 1.0% of V,and the remainder including Fe and incidental impurities, where DI* represented by the following formula is less than 60. 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 where C* = C - 1 / 4 (Ti - 48 / 14N), Mo* =; Mo (1 - 0.5 (Ti - 48 / 14N)), and 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/02
CPCC22C38/14C22C38/02C21D8/0226C22C38/04C21D8/0263C21D1/06C21D2211/004C21D2211/005C21D2211/009C22C38/22C22C38/28C22C38/58C21D8/02
Inventor 室田康宏石川操渡边好纪铃木伸一鹿内伸夫
Owner JFE STEEL CORP
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