Boron-containing steel sheet with excellent hardenability and method of manufacturing same
A manufacturing method and steel plate technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of inability to obtain hardness and inability to ensure B hardenability
Inactive Publication Date: 2012-02-08
NIPPON STEEL & SUMITOMO METAL CORP
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If BN is formed in the steel, the solid-solution B decreases, so the effect of improving hardenability by B cann
Method used
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[0142] Next, examples of the present invention will be described, but the conditions of the examples are examples of conditions employed to confirm the feasibility and effects of the present invention, and the present invention is not limited to the examples of conditions. In the present invention, various conditions can be employed within the range in which the object of the present invention can be achieved without departing from the gist of the present invention.
[0143] (Example)
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Abstract
The present invention provides a boron steel sheet including components of C: 0.20 mass% or more and 0.45 mass% or less, Si: 0.05 mass% or more and 0.8 mass% or less, Mn: 0.5 mass% or more and 2.0 mass% or less, P: 0.001 mass% or more and 0.04 mass% or less, S: 0.0001 mass% or more and 0.006 mass% or less, Al: 0.005 mass% or more and 0.1 mass% or less, Ti: 0.005 mass% or more and 0.2 mass% or less, B: 0.001 mass% or more and 0.01 mass% or less, N: 0.0001 mass% or more and 0.01 mass% or less, and the balance including Fe and inevitable impurities, wherein a mean concentration of solid B in an area from a surface to a depth of 100 [mu] m is 10 ppm or more.
Description
technical field [0001] The invention relates to a boron-added steel plate with excellent hardenability and a manufacturing method thereof. [0002] This application is based on and claims priority to Japanese application No. 2009-063603 filed on March 16, 2009, and the content thereof is incorporated herein. Background technique [0003] In the past, carbon steel plates have been widely used as raw materials for automotive parts such as chains, gears, and clutches, general industrial machinery parts, and tools such as saws and cutting tools. These parts are hardened by heat treatment such as quenching and tempering after forming the carbon steel plate into a product shape. [0004] Therefore, in carbon steel sheets, from the viewpoint of ensuring excellent workability and reducing alloy costs, a B-added carbon steel sheet has been developed that relatively reduces the amount of C or alloy elements and ensures hardenability by adding boron (B), such as disclosed in Patent D...
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IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60
CPCC22C38/02C21D8/0236C21D8/0268C21D8/0273C21D9/0068C21D9/0087C21D9/24C21D9/32C21D9/46C22C38/001C22C38/04C22C38/06C22C38/14
Inventor 阿部雅之竹田健悟矢头久齐
Owner NIPPON STEEL & SUMITOMO METAL CORP
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