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Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof

A technology for bending workability and high-strength steel plates, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems such as cracks and failure to meet specifications

Inactive Publication Date: 2005-07-13
NIPPON STEEL & SUMITOMO METAL CORP
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  • Abstract
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Problems solved by technology

Therefore, the composition and manufacturing method disclosed in JP-A-3-2321 cannot satisfy the specification
[0005] In addition, the composition system proposed in JP-A-63-72853, which aims at a high life, can ensure the weather resistance life, but cracks are generated in the shot peening-bending process of manufacturing containers, so it does not meet the specification

Method used

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  • Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof
  • Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof
  • Atmosphere corrosion resisting steel plate having high strength and excellent bending formability and method for production thereof

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Embodiment

[0045] After tapping steel numbers 1 to 12 with various components shown in Table 1, steel materials were produced under the rolling conditions shown in Table 2, samples were cut out, and the characteristics were evaluated after the surface was shot-peened. The evaluation is to measure yield strength, tensile strength, and total elongation by tensile test. Then, bending was performed using a punch with a bending angle of 90° C. and a bending radius (R) of 3 mm at the end, and the presence or absence of cracks in the bent portion was investigated.

[0046] Weldability was judged by the presence or absence of cracks in the welded portion after arc welding. Weather resistance is a corrosion-promoting test in which wetting and drying are repeated after salt spray treatment, and the weight of the sample before the test and the weight of the sample after the test with rust removed are measured to obtain the corrosion loss. As a comparison, based on the data of commercially availabl...

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Abstract

The present invention: provides a steel material that withstands bending work after blasting or the like and has weather resistance while securing an ultra-high strength of 700 MPa or higher in terms of yield strength, and a method for producing said steel sheet; and is a weather-resistant high strength steel sheet excellent in bendability, said steel sheet containing, in mass, C: 0.05 to 0.15%, Si: 0.5% or less, Mn: 0.5 to 2.0%, p: 0.02% or less, S: 0.005% or less, Ni: 0.2 to 2.0%, Cu: 0.2 to 0.5%, and Cr: 0.2 to 1.0%, and one or more of Ti: 0.03 to 0.2%, Nb: 0.01 to 0.07%, V: 0.01 to 0.07%, and B: 0.0005 to 0.0050%, with the balance consisting of Fe and unavoidable impurities, and being produced by heating it to a temperature of 1,200 DEG C or higher, thereafter finish-rolling it in the temperature range from 850 DEG C to 950 DEG C, and coiling it in the temperature range from 500 DEG C to 650 DEG C. <IMAGE>

Description

technical field [0001] The present invention relates to steel materials for railway vehicles, containers for land transportation and sea transportation, and methods for manufacturing the same, which require strength, processability after shot blasting, etc., and weather resistance. Background technique [0002] In the past, containers were required to be lightweight, long-lasting, and weather-resistant, and aluminum was the mainstream. However, high-strength and weather-resistant steel is urgently required due to its high price and low strength. The current weather-resistant steel has a tensile strength of 50kgf / mm specified in JIS G3125 2 (490MPa) grade high weather resistance rolled steel. In addition, as a high-strength steel, it was disclosed in JP-A-3-2321 that the tensile strength was 60kgf / mm 2 A method of manufacturing a weather-resistant hot-rolled steel sheet excellent in cold workability or above. [0003] In addition, as the actual use of sea containers incre...

Claims

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Application Information

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IPC IPC(8): C21D9/46C21D8/02C22C38/00C22C38/02C22C38/42C22C38/48C22C38/50C22C38/58
CPCC21D8/0226C21D9/46C22C38/02C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 中村隆彰小寺稔宫谷康裕
Owner NIPPON STEEL & SUMITOMO METAL CORP
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