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High-strength stainless steel sheet having excellent fatigue characteristics, and method for manufacturing same

A technology of stainless steel plate and manufacturing method, applied in the field of steel plate, can solve the problem of inability to stably reduce TiN-based inclusions and the like

Active Publication Date: 2018-08-03
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As will be described later, it is important to suppress the formation of TiN-based inclusions in order to improve the fatigue resistance of the steel targeted by the present invention, but the melting method disclosed in this document cannot stably reduce the TiN-based inclusions. thing

Method used

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  • High-strength stainless steel sheet having excellent fatigue characteristics, and method for manufacturing same
  • High-strength stainless steel sheet having excellent fatigue characteristics, and method for manufacturing same
  • High-strength stainless steel sheet having excellent fatigue characteristics, and method for manufacturing same

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Embodiment

[0096] The steels shown in Table 1 were melted by the VOD method. Both use VOD equipment to complete the final decarburization process of blowing oxygen into Cr-containing molten iron, and obtain molten steel with a C content of 0.10% or less of slag containing Cr oxides on the molten surface. The C content in this stage was approximately equal to the final C content shown in Table 1.

[0097] [Table 1]

[0098] Table 1

[0099]

[0100] In the final decarburization using a VOD facility, a ladle (pot) was used as a container for molten steel, and the same ladle was used until the process before casting. For this ladle, in the conventional examples of No. 1 and 2, as the fore charge, the fore charge used for smelting Ti-containing stainless steel is used, and in the conventional examples of No. 3 and 4, as the fore charge , the fore charge used in the smelting of stainless steel without adding Ti was used, and in the example of the present invention No. .

[0101] Fe-Si...

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Abstract

To realize a thin plate material having a distribution state of nonmetallic inclusions effective at improving fatigue resistance characteristics in a type of stainless steel having a high Si content in which deformation-induced martensite is generated. A thin steel plate comprising, in terms of mass%, 0.010-0.200% C, over 2.00% and no more than 4.00% Si, 0.01-3.00% Mn, 3.00% to less than 10.00% Ni, 11.00-20.00% Cr, 0.010-0.200% N, 0-3.00% Mo, 0-1.00% Cu, 0-0.008% Ti, and 0-0.008% Al, the remainder being Fe and unavoidable impurities, the distance between particles in a rolling direction being20 [mu]m or less, the distance between particles in a plate thickness direction being 10 [mu]m or less, and the number density of nonmetallic inclusions having a length in the rolling direction of 40[mu]m or greater being 3.0 inclusions / mm2 or less in an L cross-section.

Description

technical field [0001] The present invention relates to remarkably suppressed formation of coarse hard non-metallic inclusions in stainless steel grades capable of obtaining very high strength by utilizing processing-induced formation of martensitic phase, solid solution strengthening and age hardening due to high Si content steel plate. In addition, it relates to its manufacturing method. Background technique [0002] As high-strength stainless steel, metastable austenitic stainless steel typified by SUS301 is widely used. However, in order to obtain high strength in SUS301, it is necessary to increase the cold rolling rate, which is accompanied by a decrease in toughness. As a technique for avoiding this problem and achieving both high strength and high toughness at a high level, a method of achieving high strength by forming a martensitic phase induced by processing, solid solution strengthening by containing high Si content, and age hardening is known. It is used for ...

Claims

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Application Information

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IPC IPC(8): C22C38/00B21B3/02C21C7/00C21C7/04C21C7/068C21C7/076C21D9/46C22C38/58
CPCC21D9/46C21C7/076C22C38/58C21C7/0075C21C7/0087C21C7/0685C22C38/001C22C38/02C22C38/04C22C38/42C22C38/44C21D2211/001C21D2211/004C21D2211/008C22C38/40Y02P10/20B21B3/02C21C7/04C21C7/068C21D8/02C22C38/50
Inventor 江原靖弘斋藤俊松林弘泰
Owner NIPPON STEEL STAINLESS STEEL CORP
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