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Ferritic stainless steel sheet having excellent corrosion resistance against sulfuric acid, and method for production thereof

A technology of stainless steel plate and manufacturing method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of obvious surface roughness, etc., and achieve the effect of excellent sulfuric acid corrosion resistance

Active Publication Date: 2010-03-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports of steels that suppress the generation of ridges, but even with these steels, there are cases where the surface roughness of the curved part is still significant.

Method used

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  • Ferritic stainless steel sheet having excellent corrosion resistance against sulfuric acid, and method for production thereof
  • Ferritic stainless steel sheet having excellent corrosion resistance against sulfuric acid, and method for production thereof
  • Ferritic stainless steel sheet having excellent corrosion resistance against sulfuric acid, and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Ferritic stainless steel with the composition shown in Table 1 was smelted, and after being made into a slab, it was heated to 1170°C for hot rolling (finish rolling temperature: 800°C, coiling temperature: 450°C, plate thickness: 4mm), and a hot Rolled steel. The average cooling rate from finish rolling to coiling (ie, from 800°C to 450°C) was set at 20°C / sec.

[0092] The obtained hot-rolled steel sheet is annealed at 900 to 1200° C. for 30 to 300 seconds, and then pickled. Next, after performing cold rolling, it annealed on the conditions of 970 degreeC and 30-300 second, and pickling (pickling) was further implemented, and it produced the ferritic stainless steel plate (sheet thickness: 0.8 mm).

[0093] The ferritic stainless steel plate obtained above was cut into a width of 30 mm and a length of 50 mm, and both surfaces were polished with No. 600 sandpaper to prepare test pieces. The test piece was observed with a scanning electron microscope (that is, SEM), an...

Embodiment 2

[0098] In addition to confirming the effect of sulfuric acid corrosion resistance, the effect of roughening the surface of the bent portion after bending at 90° or more was also confirmed.

[0099] Ferritic stainless steel having the composition shown in Table 3 was melted and continuously cast, and the resulting slab was heated to 1170° C. and then hot-rolled. The finishing temperature and coiling temperature are shown in Table 4. In addition, among the slabs of Nos. 1 to 29 shown in Table 3, No. 1 and No. 5 are examples in which the Nb content deviates from the range of the present invention, No. 13 is an example in which the Cu content deviates from the range of the present invention, and No. 28 This is an example where the C content deviates from the scope of the present invention, and all other components satisfy the scope of the present invention.

[0100] The obtained hot-rolled steel sheet was cooled from the finishing temperature of hot rolling to the coiling tempera...

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Abstract

A ferritic stainless steel sheet having a superior sulfate corrosion resistance even in a high-temperature atmosphere or having a low degree of rough surface at a bent part formed by a bending work performed at an angle of 90 DEG or more is provided. In particular, a ferritic stainless steel sheet is provided which includes a composition containing 0.02 mass percent or less of C, 0.05 to 0.8 masspercent of Si, 0.5 mass percent or less of Mn, 0.04 mass percent or less of P, 0.010 mass percent or less of S, 0.10 mass percent or less of Al, 20 to 24 mass percent of Cr, 0.3 to 0.8 mass percent of Cu, 0.5 mass percent or less of Ni, 0.20 to 0.55 mass percent of Nb, 0.02 mass percent or less of N, and the balance being Fe and inevitable impurities; and a structure in which the maximum grain diameter of inclusions containing S is 5 ¢mu!m or less.

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet having corrosion resistance to sulfuric acid. In addition, the present invention relates to a ferritic stainless steel plate having less rough surface of a bent part after bending work of 90° or more and a method for producing the same. Background technique [0002] Fossil fuels such as petroleum and coal contain sulfur (hereinafter referred to as S). Therefore, if fossil fuels are burned, S is oxidized to SO 2 Such as sulfur oxides (sulfur oxides) (ie SO X ) into the exhaust gas. If the waste gas in the pipes of the flue (gasduct), chimney (chimney pipe), exhaust gas desulfurizer (exhaust gas desulfurizer), etc. temperature decreases, the SO X It reacts with water in the exhaust gas to become sulfuric acid, which condenses on the inside of the pipe. The condensed sulfuric acid causes corrosion of pipes (hereinafter referred to as sulfuric acid corrosion). [0003] Various techniq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/48
CPCC21D9/46C22C38/50C21D8/0205C22C38/42C22C38/02C22C38/04C21D2211/005C22C38/48C22C38/001C22C38/44
Inventor 石井知洋船川义正宇城工太田雅之
Owner JFE STEEL CORP