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Martensitic stainless steel and method for manufacturing same

A manufacturing method and stainless steel technology, applied in martensitic stainless steel and its manufacturing field, can solve problems such as being unsuitable for knives, and achieve the effect of excellent quality of the blade edge

Inactive Publication Date: 2015-03-25
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even with the rapid cooling casting method, coarse carbides condense at the crystal grain boundaries in the final strengthening heat-treated structure and may still appear unsuitable for use as a knife.

Method used

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  • Martensitic stainless steel and method for manufacturing same
  • Martensitic stainless steel and method for manufacturing same
  • Martensitic stainless steel and method for manufacturing same

Examples

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Embodiment

[0069] Hereinafter, examples of the present invention will be described. In Examples related to the present invention, microstructural properties of hot-rolled annealed sheets produced by a conventional continuous casting method and steel produced by a strip continuous casting method as an example of a rapid cooling casting method were compared.

[0070] Table 1 shows the composition of the steel produced by the ingot casting method and the strip casting method. First, in the comparative example of the present invention, 40 kg of a vacuum induction melting steel ingot having a thickness of 140 mm was produced by applying the conventional ingot casting method. This is shown in Table 1 as Comparative Example 1. Then, for hot rolling, the steel ingot was reheated at a temperature of 1250° C. in a heating furnace in an inert atmosphere, maintained at this temperature for 3 hours, and finally hot rolled to a thickness of 2 mm. In addition, steel with various components including ...

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Abstract

The present invention relates to a martensitic stainless steel for use in knives such as a kitchen knife, and to a method for manufacturing same. More particularly, the present invention provides a martensitic stainless steel manufactured by strip casting and a method for manufacturing the martensitic stainless steel, in which the components of the steel are controlled such that C is 0.4 to 0.5%, N is 0.1 to 0.2%, Cr is 13 to 15%, Si is 0.1 to 1.0%, Mn is 0.1 to 1.0%, Ni exceeds 0 and is lower than 1.0%, C+N is 0.5% or higher and N / C is 0.2% or higher, wherein the remainder comprises Fe and other inevitable impurities. The size of the residual carbide of the martensitic stainless steel is 10 [mu]m or lower and the hardness of the residual carbide is 55HRC or higher. The martensitic stainless steel of the present invention is manufactured by strip casting in such a manner that the length of the residual carbide remaining after strengthening heat treatment becomes 10 [mu]m or lower when performing the strengthening heat treatment on the annealed hot -rolled steel strip having a thickness of 1mm or higher manufactured by strip casting. Thus, a martensitic stainless steel to be used in knives such as a kitchen knife having excellent blade tip quality and superior hardness and corrosion-resistance can be obtained.

Description

technical field [0001] The present invention relates to a martensitic stainless steel and a manufacturing method thereof, and more particularly to a martensitic stainless steel to which a rapid cooling casting method is applied for high-grade kitchen knives and a manufacturing method thereof. Background technique [0002] Martensitic stainless steel is essentially a steel composed of iron (Fe)-chromium (Cr)-carbon (C) as the main component. 1% carbon. For such martensitic stainless steels, alloy manufacturers apply a batch annealing process to produce hot-rolled annealed sheets composed of ferrite phase and Cr carbonitrides, followed by pickling of the hot-rolled annealed sheets, and then It is cold-rolled to meet the thickness required by the final customer and supplied. Next, the final customer applies an intensive heat treatment process to the stainless steel, thereby transforming the soft material composed of ferrite and carbide into a high-hardness martensitic structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/22B22D11/06
CPCC22C38/001B22D11/002B22D11/0622C21D6/002C21D8/0215C21D8/0226C21D8/0263C21D2211/004C21D2211/008C22C38/02C22C38/04C22C38/44C22C38/00B22D11/06C22C38/22
Inventor 蔡东澈李哉和郑成仁李一九
Owner POHANG IRON & STEEL CO LTD
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