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A kind of ferritic stainless steel used for rear stage muffler of automobile exhaust system equipped with SCR treatment device and preparation method

A technology for an automobile exhaust system and a treatment device, which is applied in the field of low-cost ferritic stainless steel and its preparation, can solve problems such as no good solution, and achieves good condensate corrosion, good economic and social benefits, and low The effect of sulfur and phosphorus content

Active Publication Date: 2020-04-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Therefore, for the above-mentioned problems encountered, there is no good solution at present, that is to say, there is no stainless steel material that meets the above-mentioned use environment and has a long service life.

Method used

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  • A kind of ferritic stainless steel used for rear stage muffler of automobile exhaust system equipped with SCR treatment device and preparation method
  • A kind of ferritic stainless steel used for rear stage muffler of automobile exhaust system equipped with SCR treatment device and preparation method
  • A kind of ferritic stainless steel used for rear stage muffler of automobile exhaust system equipped with SCR treatment device and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The percentage by weight of the composition of ferritic stainless steel rolled in the present invention is: C: 0.007%, Si: 0.34%, Mn: 0.75%, P: 0.018%, S: 0.003%, Cr: 12.5%, N: 0.007%, Nb: 0.25, Ti: 0.18, and the rest are Fe and unavoidable impurities. Its recrystallization temperature is 845°C. its microstructure see figure 1 .

[0079] The steelmaking raw materials are smelted in the converter and refined outside the furnace. The continuous casting slab is cast, and the casting temperature is controlled at 1600°C.

[0080] Slab hot rolling, the heating temperature is 1080℃~1180℃, the rough rolling temperature of hot rolling is 1080℃, the final rolling temperature is ≥900℃, the rough rolling reduction rate is 90%, the final thickness of the hot rolled plate is 6.0mm; the final rolling temperature is controlled at 900°C.

[0081] The continuous annealing temperature of the hot-rolled sheet is 930°C, take out the water to cool and pickle with mixed acid of nitric ac...

Embodiment 2

[0088] The percentage by weight of the composition of ferritic stainless steel rolled in the present invention is: C: 0.007%, Si: 0.40%, Mn: 0.85%, P: 0.018%, S: 0.003%, Cr: 13.0%, N: 0.005%, Nb: 0.26, Ti: 0.18, and the rest are Fe and unavoidable impurities. Its recrystallization temperature is 840°C.

[0089] The steelmaking raw materials are smelted in the converter and refined outside the furnace. The continuous casting slab is cast, and the casting temperature is controlled at 1600°C.

[0090] The billet is hot-rolled, the heating temperature is 1080-1180°C, the rough-rolling temperature is 1080°C, the finish-rolling temperature is ≥900°C, the rough-rolling reduction rate is 90%, and the final thickness of the hot-rolled plate is 6.0mm; the finish-rolling temperature is controlled at 900°C.

[0091] The continuous annealing temperature of the hot-rolled sheet is 920°C, take out the water to cool and pickle with mixed acid of nitric acid and hydrofluoric acid;

[0092]...

Embodiment 3

[0098] The percentage by weight of the composition of ferritic stainless steel rolled in the present invention is: C: 0.007%, Si: 0.30%, Mn: 0.85%, P: 0.018%, S: 0.003%, Cr: 13.0%, N: 0.005%, Nb: 0.30, Ti: 0.22, and the rest are Fe and unavoidable impurities. Its recrystallization temperature is 838°C.

[0099] The steelmaking raw materials are smelted in the converter and refined outside the furnace. The continuous casting slab is cast, and the casting temperature is controlled at 1600°C.

[0100] The billet is hot rolled, the heating temperature is 1150°C, the rough rolling temperature is 1080°C, the final rolling temperature is ≥900°C, the rough rolling reduction rate is 90%, the final thickness of the hot rolled plate is 6.0mm; the final rolling temperature is controlled at 890°C .

[0101] The continuous annealing temperature of the hot-rolled sheet is 920°C, take out the water to cool and pickle with mixed acid of nitric acid and hydrofluoric acid;

[0102] The pickl...

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Abstract

The invention relates to ferrite stainless steel for an automobile exhaust system post-silencer loaded with an SCR (Selective Catalytic Reduction) treatment device. The ferrite stainless steel is prepared from less than or equal to 0.010% of C, less than or equal to 0.004% of S, less than or equal to 0.020% of P, less than or equal to 0.45% of Si, less than or equal to 1.0% of Mn, 11.0%-14.0% of Cr, 0.01%-0.08% of Al, 0.1%-0.4% of Nb, 8*(C+N)-0.3% of Ti, less than or equal to 0.008% of N, less than or equal to 0.015% of (C+N) and the balance of Fe. The ferrite stainless steel does not containprecious metals such as nickel, molybdenum and tin, the yield strength of a finished plate is 260-310MPa, the tensile strength is 490MPa-550MPa, and the elongation is 35%-40%. The ferrite stainless steel has high corrosion resistance to condensate containing urea and decomposed products thereof and can prolong the service life of an automobile post-silencer when being used for manufacturing the automobile post-silencer loaded with the SCR post-treatment device.

Description

technical field [0001] The invention belongs to the technical field of ferritic stainless steel alloy materials, in particular to a low-chromium, nickel-free and niobium-containing low-cost ferritic stainless steel that is resistant to condensate corrosion and is used for the manufacture of automobile mufflers equipped with SCR processing devices and a preparation method thereof . Background technique [0002] In order to reduce the environmental pollution caused by automobile exhaust, various countries have begun to impose strict requirements on motor vehicle emissions, and significantly reduce particulate matter (PM), nitrogen oxides (NOx), sulfur dioxide (SO 2 ) emission caps, mandatory implementation of vehicle exhaust emission standards. Europe and the United States have implemented Euro 5 and Euro 6 emission standards in 2007, and the emission standards for vehicle nitrogen oxides NO X and PM emissions are controlled. [0003] China's auto industry has developed rap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D2211/005C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28
Inventor 夏佃秀尚成嘉王守仁曹树坤陈培敦陈坤宋强张晓东
Owner UNIV OF JINAN
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