Stainless steel sheet for parts and process for manufacturing the same

A manufacturing method, stainless steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., to achieve high reliability and excellent fatigue characteristics

CN101490298AActive Publication Date: 2009-07-22NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-07-22

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Abstract

The invention provides a stainless steel sheet which has excellent strength and ductility and is improved in workability (formability and etchability) and fatigue characteristics and a process for manufacturing the stainless steel sheet. Further, the invention ensures industrial and stable supply of the stainless steel sheet at a low cost. A stainless steel sheet which contains by mass C: 0.01 to 0.08%, Si: 0.1 to 2.0%, Mn: 3.0% or below, Cr: 10.0 to 20.0%, Ni: 3.0 to 12.0% and N: 0.02 to 0.24% when the whole amount of the stainless steel is taken as 100% by mass and has an Md value of 0 to 80 as defined by the formula: Md=500-458(C+N)-9(Si+Mn)-14Cr-20Ni and in which compounds formed from the above components and having maximum diameters of 20mum or above reside in an amount of at most 30 pieces per 5g by mass of the stainless steel and the metal structure of the whole of the stainless steel is a mixed structure composed of recrystallized grains and unrecrystallized parts.
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Description

Technical field

[0001] The present invention relates to a stainless steel steel sheet processed into industrial products and the like and a method for manufacturing the same. In particular, it relates to a stainless steel steel sheet for parts that has high strength, high fatigue properties, and excellent workability, and also has high flatness and low residual stress. And its manufacturing method. That is, the present invention relates to a stainless steel steel plate that exhibits excellent performance in a large number of products and parts manufactured from a stainless steel steel plate or steel strip (hereinafter collectively referred to as "stainless steel plate") and a method of manufacturing the same. In particular, it relates to a stainless steel steel plate suitable for assembling a wide variety of components used in high-precision and complicated industrial products that have become smaller and lighter in weight, and a method of manufacturing the same. Background techn...

Examples

Embodiment

[0111] Next, it will be described in more detail through examples. However, the present invention is not limited by this embodiment. In the examples, a stainless steel steel plate corresponding to the present invention and a stainless steel steel plate not conforming to the present invention were produced and various evaluations were performed.

[0112] (i) Manufacturing of test materials

[0113] Table 1 shows the composition of the test materials. For each component that is outside the scope of the present invention, "*" is added to the number of its content.

[0114] [Table 1]

[0115]

[0116] Md=500-458(C+N)-9(Si+Mn)-14Cr-20Ni

[0117] or

[0118] Md=500-458(C+N)-9(Si+Mn)-14Cr-20Ni-65Nb-27Ti-61V

[0119] For each raw material having the composition shown in a to 1 in Table 1, a stainless steel steel plate was manufactured following each manufacturing condition. Table 2 shows the main conditions in the manufacturing process.

[0120] [Table 2]

[0121]

[0122] The manufac...