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Hot-rolled ferritic stainless steel sheet with excellent cold cracking resistance and manufacturing process therefor

A technology for hot-rolled steel sheets and cold cracks, which is applied in the field of ferritic stainless steel hot-rolled steel sheets, can solve problems such as insufficient and effective cold cracks, and achieve the effects of preventing cold cracks, increasing manufacturing yield, and suppressing the use of energy

Active Publication Date: 2014-06-11
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the inventors of the present application applied the above-mentioned conventional knowledge to various ferritic stainless steels, they found that cold cracks sometimes occurred, which was not necessarily effective for improving toughness.
That is, existing techniques are not sufficiently effective and further improvements are needed

Method used

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  • Hot-rolled ferritic stainless steel sheet with excellent cold cracking resistance and manufacturing process therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] Hereinafter, the effects of the present embodiment will be described using examples, but the present embodiment is not limited to the conditions used in the following examples.

[0101] In this example, first, each steel having the composition shown in Table 1 was melted and cast to obtain a steel ingot (steel billet).

[0102] The ingot was ground to a thickness of 90 mm. Hot rolling was performed at the finishing temperature (FT) shown in Tables 2 and 3, and the steel ingot was rolled to a plate thickness of 5 mm to obtain a hot-rolled steel plate. Next, while monitoring the temperature of the rolled steel sheet with a radiation thermometer, it was cooled to the coiling temperature (CT) shown in Tables 2 and 3 by water cooling. In addition, the cooling rate at this time was about 20°C / sec.

[0103] Next, the hot-rolled steel sheet was inserted into a furnace whose temperature in the furnace was controlled to the coiling temperature (CT) shown in Tables 2 and 3, and ...

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Abstract

This hot-rolled ferritic stainless steel sheet has a composition containing, in mass%, up to 0.0150 % of C, 0.01 to 2.00 % of Si, 0.01 to 2.00% of Mn, less than 0.040% of P, up to 0.010% of S, 10.0 to 30.0% of Cr, 0.001 to 0.100% of Al and up to 0.0200% of N with the balance being Fe and unavoidable impurities, and satisfies the relationship: La / L >= 0.20 [wherein L is the length of all grain boundaries with misorientation angles of 1 to less than 180 DEG as observed in a section in the range of 1 / 4 to 3 / 4 of the sheet thickness and La is the length of subgrain boundaries with misorientation angles of 1 to less than 15 DEG as observed therein].

Description

technical field [0001] The present invention relates to a ferritic stainless steel hot-rolled steel sheet excellent in cold cracking resistance and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2011-270092 for which it applied in Japan on December 9, 2011, and uses the content here. Background technique [0003] Ferritic stainless steel is used in a wide range of applications such as home appliances, building materials, and automobile parts. Conventionally, appropriate amounts of various elements have been added to this steel in accordance with necessary properties such as corrosion resistance and high temperature properties. [0004] Addition of Cr, Mo, and Ni is known to be effective for improving corrosion resistance. In addition, in order to improve high-temperature characteristics (strength, oxidation resistance), it is effective to add Nb, Al, Si, or the like. [0005] Generally, the more these ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B3/02C21D9/46C22C38/38C22C38/58
CPCC22C38/22C22C38/04C22C38/58C21D9/46C22C38/001C22C38/26C22C38/44C22C38/20C22C38/00C22C38/60C22C38/42C22C38/48B21B3/02C22C38/06C22C38/38C21D8/0463C22C38/004C21D2211/005C22C38/32C22C38/54C22C38/28C21D6/002C22C38/02C21D8/0426C22C38/50C22C38/008C22C38/40
Inventor 木村谦滨田纯一高桥淳小山祐司后藤茂之
Owner NIPPON STEEL STAINLESS STEEL CORP
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