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Hardening method of steel member

A technology of steel components and quenching temperature, which is applied in the field of quenching of steel components, can solve problems such as large heat treatment deformation of steel components, and achieve the effects of reducing uneven heating, shortening heating time, and reducing uneven cooling

Active Publication Date: 2017-07-28
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And, when the cooling unevenness is obvious, the steel member after cooling will produce large heat treatment deformation

Method used

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  • Hardening method of steel member
  • Hardening method of steel member
  • Hardening method of steel member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] 150mm of thermal processing tool steel of SKD61 of the JIS standard 3 block widget. It is then milled on all sides to give it a metallic luster as a steel component for hardening. Next, a well-known anti-reflection agent for laser processing (product name: Black Guard Spray [Fain Chemical]) containing graphite fine powder is evenly sprayed on part or all of the surface of these steel members to the extent that no color spots can be detected visually. Japan Co., Ltd.]), which was coated and covered. Covering conditions are shown in Table 1, and there are the following two conditions: Coating all surfaces of the block member (No.1); leaving the opposite two surfaces, and forming a circular shape at the center of the remaining four sides. shape (radius 75 mm) for coating (No. 2).

[0039] Next, the infrared radiance at 200° C. was measured for the surface of the steel member which was subjected to the above-mentioned coating treatment and the surface which was not subje...

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Abstract

The invention provides a hardening method of a steel member in which a heat cycle time required for a sequence of hardening process can be shortened and heat treatment deformation after hardening is small. Provided is a hardening method of a steel member in which coating treatment in which one part or the whole of a surface of a steel member before being heated to a hardening temperature is coated with graphite, then the steel member after the coating treatment is heated to a hardening temperature in a heating furnace having an exothermic body, and cooled. In heating to the hardening temperature, at least one time in the heating is preferably performed in a vacuum or a decompressed atmosphere. The coating treatment can be performed with a carburization inhibitor or a decarbonization inhibitor which is coated on a surface of the steel member.

Description

[0001] This application is a divisional application with an application date of July 24, 2013, an application number of 201310314249.5, and an invention title of quenching method for steel components. technical field [0002] The invention relates to a quenching method for steel components. Background technique [0003] Quenching treatment is performed on steel members such as various steel products and steel products represented by molds and tools. Quenching treatment is a treatment in which the steel member is heated to an austenite structure state and then cooled. In addition, for the means of heating the steel components to the quenching temperature, the following methods are used: using the atmospheric gas introduced into the furnace as a medium, convective heating to transfer heat to the steel components; radiation from various ray sources (heating bodies) to the steel components Infrared rays are infrared heating by electromagnetic wave heating (Patent Documents 1 to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/70C21D1/74C21D1/773C21D9/00
CPCC21D1/18C21D1/70C21D1/74C21D1/773C21D9/0068
Inventor 西田纯一
Owner HITACHI METALS LTD
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