Hot rolled steel sheet
A technology for hot-rolled steel sheets and steel sheets, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as insufficient scale adhesion, and achieve inhibition of scale peeling, excellent scale adhesion, and surface properties. excellent effect
Active Publication Date: 2022-02-22
NIPPON STEEL CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
However, according to the research of the present inventors, in the technology of Patent Document 3, even if the scale is not peeled off at the point of time when the hot-rolled steel sheet is produced, the scale adhesion is not enough when it is processed into various parts, Oxidized scale peeling may occur
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0161] Hereinafter, the steel sheet related to the present invention will be described more specifically with reference to examples. However, the conditions in the examples described below are just examples of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is not limited by these examples of conditions. In the present invention, various conditions can be adopted as long as the object of the present invention can be achieved without departing from the gist of the present invention.
[0162] Steels (A to M) with chemical compositions shown in Table 1 were cast, and after casting, the slabs were directly or temporarily cooled to room temperature and then heated to a temperature range of 1200°C to 1300°C for 60 minutes.
[0163] Then, the slab is rough-rolled at a temperature of 1100° C. or higher to produce a rough-rolled sheet.
[0164] Then, the rough-rolled sheet was finished-rolled under each condition descri...
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Abstract
This hot rolled steel sheet comprises a base steel sheet and a scale formed on a surface of the base steel sheet, wherein the base steel sheet has a predetermined chemical composition, the scale has a layer structure composed of wustite, magnetite, and hematite in this order from the base steel sheet, or a layer structure composed of the wustite and the magnetite, and when the thickness of the scale is s, the thickness of the hematite is h, and when the thickness of the magnetite is m, s, h, and m satisfy expression (1) of (h+m) / s<0.20 and expression (2) of h<=m / 4.
Description
technical field [0001] The present invention relates to hot-rolled steel sheets. [0002] This application claims priority based on Japanese Patent Application No. 2019-128611 filed in Japan on July 10, 2019, and its content is cited. Background technique [0003] A so-called hot-rolled steel sheet produced by hot rolling is widely used as a relatively inexpensive structural material as a raw material for structural components of vehicles and industrial equipment. Since the hot-rolled steel sheet passes through an oxidizing atmosphere during hot rolling, scale (iron oxide) is inevitably formed on the surface of the steel sheet. This scale may be peeled off from the base steel material of the steel sheet during hot rolling, coiling, or passing through various rolls in the subsequent finishing process. In this way, peeling of scale may occur in the manufacturing process of hot-rolled steel sheets, or even if the scale is not peeled off at the point of time after the producti...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/16C22C38/18C22C38/08C22C38/14C22C38/12C22C38/38C22C38/32C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/16C22C38/18C22C38/08C22C38/14C22C38/12C22C38/005C22C38/38C22C38/32C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D8/0226C21D9/46C22C38/002C21D8/0205C21D8/0263C21D8/0278C21D1/02C23C28/04C22C38/001C21D6/004C21D6/005C21D6/008C22C38/004
Inventor 榊原睦海榊原章文安里哲山本晃大
Owner NIPPON STEEL CORP