Abrasion-resistant steel plate and manufacturing process therefor
A technology of wear-resistant steel plate and manufacturing method, applied in the field of wear-resistant steel plate, can solve the problems of cold crack sensitivity and poor toughness, and achieve the effect of improving manufacturing efficiency and excellent impact wear resistance.
Active Publication Date: 2015-04-08
JFE STEEL CORP
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Problems solved by technology
However, in this case, the cold crack susceptibility and toughness of the steel plate deteriorate
Method used
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[0099] Examples are described below.
[0100] Through the converter-pot refining-continuous casting method, the steel slabs prepared with various compositions shown in Table 1 are heated to 1000-1200°C under the conditions shown in Table 2, and then hot-rolled. Direct quenching (DQ) is carried out immediately after production. Quenching (RQ) is performed on a part of the steel plate that has undergone direct quenching (DQ) by reheating to 900°C. In addition, quenching (RQ) was performed after reheating to 900 degreeC of some steel plates after hot rolling and cooling.
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Abstract
The purpose of the present invention is to provide: an abrasion-resistant steel plate which exhibits excellent impact-abrasion resistance characteristics and which is suitable for use in construction machinery, shipbuilding, steel tubing, civil engineering, architecture and so on; and a manufacturing process therefor. In view of the problem, this abrasion-resistant steel plate is characterized in that: the steel plate has a specific steel composition; the DI* defined by formula (1) is 100 to 250; the surface layers of the plate comprise at least 90% of martensite in area fraction and exhibit a Brinell hardness of 450HBW10 / 3000 or more; and the thicknesswise central zone of the plate comprises at least 70% of lower bainite in area fraction, the thicknesswise central zone being a zone which spreads from the position corresponding to one half of the plate thickness to the positions corresponding to depths of 0.5mm from both surfaces. 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) × (1.75×V+1) × (1.5×W+1) ··(1) [wherein the symbols of elements represent the contents (mass%) of the elements respectively]
Description
technical field [0001] The present invention relates to a wear-resistant steel plate with a plate thickness greater than 30 mm and less than 150 mm suitable for engineering machinery, shipbuilding, steel pipes, civil engineering, construction, etc., especially when the surface layer and cross-section of the steel plate are exposed to impact wear environments A steel plate excellent in impact wear resistance and a method for producing the same. Background technique [0002] For wear-resistant steel, in order to improve the wear resistance by making the microstructure a martensite single-phase structure, the amount of solid solution C is generally increased to increase the hardness of the martensite structure itself. However, in this case, the cold crack sensitivity and toughness of the steel sheet deteriorate. Therefore, wear-resistant steels with improved low-temperature toughness and toughness have been developed. [0003] For example, Patent Document 1 relates to a thick...
Claims
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IPC IPC(8): C22C38/00C21D8/02C22C38/54
CPCC22C38/54C22C38/14C21D8/02C22C38/002C22C38/005C22C38/12C22C38/04C21D8/0263C22C38/22C22C38/44C21D2211/002C22C38/50C22C38/46C22C38/42C21D2211/008C22C38/48C22C38/06C21D2221/10C22C38/02C21D8/0205C22C38/001C22C38/18C22C38/00C21D6/001C21D6/002C21D6/004C21D6/005C21D6/008C21D8/0226C21D9/46C22C38/08C22C38/16C22C38/24C22C38/26C22C38/28C22C38/32
Inventor 植田圭治三浦进一石川信行
Owner JFE STEEL CORP
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