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Ferritic stainless steel sheet excellent in surface gloss and corrosion resistance and method for producing same

a technology of which is applied in the direction of heat treatment equipment, heating/cooling devices, furnaces, etc., can solve the problems of not studying the effect of surface glossiness at all, and it is difficult to say that sus430lx and sus430j1l will have economic sufficient in the future, so as to achieve excellent surface gloss and corrosion resistance, not increase in alloy cost or manufacturing cost, and excellent economic

Inactive Publication Date: 2013-01-17
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an alloy saving type ferritic stainless steel sheet that has excellent surface glossiness and corrosion resistance without increasing manufacturing cost. This steel sheet has a similar corrosion resistance to SUS4 30LX and SUS4 30J1L, and significantly improves surface glossiness.

Problems solved by technology

However, due to the price fluctuations in the component element Cr of stainless steel and the rising price of the rare element Nb, it is difficult to say that SUS430LX and SUS430J1L will also have economically sufficient in the future.
However, these literatures do not study the effects on the surface glossiness at all, as explained above.

Method used

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  • Ferritic stainless steel sheet excellent in surface gloss and corrosion resistance and method for producing same

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examples

[0050]Examples of the present invention will be explained as follows.

[0051]A ferritic stainless steel which has the ingredients of Table 1 was smelted, hot rolled by an extraction temperature of 1150 to 1220° C., and coiled by a coiling temperature of 480 to 750° C. to obtain hot rolled steel sheet of a thickness of 4.0 to 6.0 mm. The hot rolled steel sheet was annealed, or not, and was cold rolled once or twice interspaced by process annealing to produce 0.4 to 1.0 mm thick cold rolled steel sheet. The obtained cold rolled steel sheet was treated by finish annealing at a temperature of completion of recrystallization of 870 to 1020° C. and was treated by ordinary pickling to obtain the No. 2B product in surface specifications prescribed in JIS G 4307. For the ordinary pickling, for example, dipping in an alkali salt bath (430° C.), then treatment by neutral salt electrolysis (50° C., Na2SO4) may be used.

For the ingredients of the steel, both of the ranges prescribed by the present ...

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Abstract

The stainless steel sheet according to the present invention is a ferritic stainless steel which is comprised of, by mass %, C: 0.001 to 0.03%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 12 to 16%, N: 0.001 to 0.03%, Nb: 0.05 to 0.3%, Ti: 0.03 to 0.15%, Al: 0.005 to 0.5%, Sn: 0.01 to 1.0%, and has the remainder of Fe and unavoidable impurities and satisfies the relationship of 1≦Nb / Ti≦3.5. The method comprises heating a slab of stainless steel which contains the above steel ingredients, setting the extraction temperature 1080 to 1190° C., and setting the coiling temperature after the end of hot rolling 500 to 700° C. After hot rolling, the method comprises annealing the hot rolled sheet, which can be omitted, cold rolling once or cold rolling twice or more which includes processing annealing, and finish annealing the steel sheet at 850 to 980° C.

Description

TECHNICAL FIELD[0001]The present invention relates to an alloy-saving type ferritic stainless steel sheet which is excellent in surface glossiness and corrosion resistance and a method for producing the same.BACKGROUND ART[0002]A ferritic stainless steel sheet is extensively used in household electrical appliances, kitchen equipments, and other fields in which corrosion resistance and surface quality in an indoor environment are demanded. As examples of such a ferritic stainless steel sheet, SUS430LX and SUS430J1L in the JIS standard may be mentioned. Further, NPLT 1 describes representative examples SUS430LX and SUS430J1L which are excellent in corrosion resistance. Such a ferritic stainless steel reduces the C and N, contains Cr: 16 to 20%, Nb: 0.3 to 0.6%, and Ti and trace amounts of Cu and Mo added compositely to prevent deterioration of the surface properties due to pitting or rusting.[0003]In the past, the above-mentioned ferritic stainless steel sheet to which Nb, Ti, etc. ha...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D8/02C22C38/18C22C38/26C22C38/30B21B1/02C22C38/24C22C38/20C22C38/48C22C38/50C22C38/28C22C38/32
CPCB21B3/02C21D6/002C22C38/26C21D2211/005C21D8/0205C22C38/001C22C38/008C22C38/02C22C38/04C22C38/06C22C38/28
Inventor HATANO, MASAHARUYAMAGISHI, AKIHITOTAKAHATA, SHIGENORIISHIMARU, EIICHIRO
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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