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Austenitic stainless steel sheet and method for producing same

A technology of stainless steel plate and austenitic system, applied in the field of austenitic stainless steel plate and its manufacturing, can solve problems such as cracks and insufficient structural member characteristics, and achieve the effect of improving impact absorption capacity and toughness.

Active Publication Date: 2016-03-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the grain size of the austenitic stainless steel of this invention is as large as several 10 μm. Therefore, when it is molded as an automotive structural member, cracks often occur on the surface of the bent portion, and its properties as a structural member are insufficient.

Method used

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  • Austenitic stainless steel sheet and method for producing same
  • Austenitic stainless steel sheet and method for producing same
  • Austenitic stainless steel sheet and method for producing same

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Embodiment

[0071] A 17 kg block of stainless steel having the chemical composition shown in Table 1 was melted. In Table 1, steel grades A1 to A25 are chemical composition, (C+3×N) content, Md 30 Values ​​satisfying the scope of the present invention, steel grades B1 to B14 are chemical composition, (C+3×N) amount, Md 30 At least one of the values ​​is outside the range of the present invention. In Table 1, "-" means that it is not expected to be included (the content is less than the desired range or 0).

[0072] [Table 1]

[0073]

[0074] This stainless steel ingot was cut to form a raw material for hot rolling with a thickness of 45 mm. Thereafter, hot rolling was performed to form a hot-rolled steel sheet with a thickness of 6.0 mm, and then hot-rolled sheet annealing was performed on the hot-rolled steel sheet at the annealing temperature and annealing time shown in Table 2, respectively. The steel sheets 28, 34, 35, 43, and 44 are examples in which the annealing temperature...

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Abstract

Provided is an austenitic stainless steel sheet which has a product of the 10% flow stress at a strain rate of 1000 / s and the uniform elongation at a strain rate of 0.1 / s of 450 MPa or more and also has high strength at a high strain rate and improved ductility at a low strain rate. An austenitic stainless steel sheet containing, in % by mass, 0.02 to 0.30% of C, 10.0 to 25.0% of Cr, 3.5 to 10.0% of Ni, 0 to 3.0% of Si, 0.5% to 5.0% of Mn, 0.10 to 0.40% of N, 0 to 3.0% of Mo, 0 to 3.0% of Cu, 0 to 0.10% of Ti, 0 to 0.50% of Nb and 0 to 1.0% of V, wherein the value determined by the following formula: C + 3 * N is 0.4% or more, and the remainder is made up by Fe and impurities. In the austenitic stainless steel sheet, the Md30 value which is defined by formula (1) is 0 to 50 DEG C inclusive, the volume ratio of each of a Cr carbide and a Cr nitride is 1% or less, and the average crystal particle diameter of a parent phase is 10 [mu]m or less.

Description

technical field [0001] The present invention relates to an austenitic stainless steel plate and a method for producing the same, and more specifically, to an austenitic stainless steel plate suitable for use as a structural member of an automobile, an electric train, etc., which balances strength in a region of high strain rate corresponding to collision and low pressure corresponding to press molding. Tough austenitic stainless steel sheet in the strain rate region and method for its manufacture. Background technique [0002] In recent years, as a response to environmental problems, improvement in fuel economy of automobiles, railways, etc. has been desired, and weight reduction of vehicle bodies is very effective as a solution to this. Furthermore, in reducing the weight of the vehicle body, it is effective to reduce the weight of the materials that form structural members that account for most of the weight, specifically, to reduce the thickness of the materials. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/58
CPCC21D6/004C21D8/0226C21D8/0263C21D9/46C22C38/40C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
Inventor 泽田正美安达和彦
Owner NIPPON STEEL CORP
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