Ferritic stainless steel sheet for original pipe of bellows

A technology of stainless steel plate and corrugated pipe, applied in the field of ferritic stainless steel plate for corrugated pipe original pipe, which can solve the problems of insufficient and unavailable supply, and achieve the effects of excellent high-temperature fatigue characteristics, excellent processability, and excellent high-temperature characteristics

Inactive Publication Date: 2008-04-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, even with the above technology, the bellows formability of a raw pipe made of a ferritic stainless steel plate is still insufficient when compared with a raw pipe made of an austenitic stainless steel plate. Yes, ferritic stainless steel sheets for bellows primary pipes that can be applied to shapes higher than the corrugated pipe height H are not available

Method used

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  • Ferritic stainless steel sheet for original pipe of bellows
  • Ferritic stainless steel sheet for original pipe of bellows
  • Ferritic stainless steel sheet for original pipe of bellows

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] After smelting various steels with the composition shown in Table 1 in a high-frequency vacuum melting furnace and making 50kg steel ingots, after heating at 1170°C for 1 hour, carry out hot rolling with a final rolling temperature of 800°C, thereby producing A hot-rolled plate with a plate thickness of 3.5 mm. Then, after annealing the hot-rolled sheet at 1040° C. for 30 seconds, the oxide scale formed on the surface of the steel sheet is pickled and removed, and cold-rolled to form a cold-rolled sheet with a thickness of 0.4 mm, degreased Thereafter, annealing was performed at 1030° C. for 30 seconds to obtain a cold-rolled annealed sheet. From this cold-rolled annealed sheet, the above-mentioned special-shaped tensile test piece (parallel portion width: 150 mm, parallel portion length: 25 mm) was selected parallel to the rolling direction, and subjected to a tensile test, and the uniform elongation was measured. In addition, the above-mentioned high-temperature salt...

Embodiment 2

[0095] After smelting various steels with the composition shown in Table 3 in a high-frequency vacuum melting furnace and making 50kg steel ingots, after heating at 1170°C for 1 hour, hot rolling with a final rolling temperature of 800°C was carried out to produce A hot-rolled plate with a plate thickness of 3.5 mm. Then, after the hot-rolled sheet is annealed at 1040° C. for 30 seconds, the scale formed on the surface of the steel sheet is removed by pickling and cold-rolled to form a cold-rolled sheet with a thickness of 0.4 mm. After the plate is degreased, it is annealed at a temperature of 990 to 1050° C. for 30 seconds to change the average grain size D of the steel plate, thereby changing the average grain size of the cold-rolled annealed plate.

[0096] From this cold-rolled annealed sheet, the above-mentioned special-shaped tensile test piece (parallel portion width: 150 mm, parallel portion length: 25 mm) was selected parallel to the rolling direction, and subjected ...

Embodiment 3

[0099] After smelting various steels with the composition shown in Table 5 in a high-frequency vacuum melting furnace and making 50kg steel ingots, after heating at 1170°C for 1 hour, hot rolling with a final rolling temperature of 800°C was carried out to produce A hot-rolled plate with a plate thickness of 3.5 mm. Then, after annealing the hot-rolled sheet at 1040° C. for 30 seconds, the oxide scale formed on the surface of the steel sheet is pickled and removed, and cold-rolled to form a cold-rolled sheet with a thickness of 0.4 mm, degreased Thereafter, annealing was performed at 1030° C. for 30 seconds to obtain a cold-rolled annealed sheet. At this time, the surface roughness of the steel sheet was changed by changing the roughness of the work rolls during cold rolling (in the range of 0.07 to 0.80 μm in arithmetic mean roughness Ra). From this cold-rolled annealed sheet, the above-mentioned special-shaped tensile test piece (parallel portion width: 150 mm, parallel por...

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Abstract

A ferrite stainless steel sheet for bellows stock pipe that simultaneously attains excellent workability and excellent high-temperature properties (high-temperature salt erosion resistance and high-temperature fatigue performance). In particular, there is provided a ferrite stainless steel sheet for bellows stock pipe comprising 0.015 mass% or less C, 1.0 mass% or less Si, 1.0 mass% or less Mn, 0.04 mass% or less P, 0.010 mass% or less S, 11 to 19 mass% Cr, 0.015 mass% or less N, 0.15 mass% or less Al, 1.25 to 2.5 mass% Mo, 0.3 to 0.7 mass% Nb, 0.0003 to 0.003 mass% B and the balance Fe and unavoidable impurities. In preferred form, there is provided a ferrite stainless steel sheet for bellows stock pipe whose average crystal grain diameter (D) is 35 mum or less, or whose surface roughness in terms of Ra is 0.40 mum or less.

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet used for a raw material pipe for bellows pipe, and in particular to a ferritic stainless steel sheet having excellent formability and high-temperature fatigue properties. ), high-temperature salt corrosion (high-temperature salt corrosion) excellent ferritic stainless steel plate for the original pipe of the bellows. Background technique [0002] In mechanical devices that handle liquids, gases, or powders, etc., they are usually conveyed through metal piping. In addition, usually in the middle of the pipe, in order to absorb the vibration of the mechanical device and the strain (strain) and stress (stress) caused by the thermal expansion (thermal expansion) of the pipe, and alleviate the influence thereof, a parallel corrugated wall (parallel corrugated wall) is installed. ), a corrugated metal pipe (accordion steel pipe), that is, a corrugated pipe (also called a flexible pipe (flexib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/32C22C38/54
Inventor 加藤康尾崎芳宏古君修平田知正宇城工
Owner JFE STEEL CORP
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