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Bicycle frame parts made from anti-bending stainless steel

A technology for structural parts and anti-bending, which is applied to vehicle parts, bicycle accessories, rims, etc., and can solve problems such as poor strength of stainless steel

Inactive Publication Date: 2004-04-21
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this stainless steel has poor strength due to the total reduction of C and N content to 0.04% by mass or less, which has nothing to do with martensite generation
The steel can be strengthened by adding alloying elements, but the addition of alloying elements increases the cost of the steel

Method used

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  • Bicycle frame parts made from anti-bending stainless steel
  • Bicycle frame parts made from anti-bending stainless steel
  • Bicycle frame parts made from anti-bending stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Some steels with the chemical composition shown in Table 1 were melted in a vacuum furnace, cast into slabs, hot rolled to a thickness of 4.5mm, annealed in the furnace at 780°C for 12 hours and then cooled as they were, the annealed steel sheets were cooled, cold rolled To a thickness of 1.5mm, intermediate annealing at 800°C for 1 minute, cooling in the open air, cold rolling again to a final thickness of 0.5mm, and dual-phase annealing at 950°C for 1 minute.

[0052] Each dual-phase annealed steel sheet was observed by a microscope in a field of view of 200 μm×200 μm in the thickness direction to detect martensite. Each steel plate was observed 10 times, and the volume ratio of martensite was calculated and averaged.

[0053] Test blocks sampled from each dual phase annealed steel plate were plastic formed and TIG welded to prepare figure 1 A tire rim of the shape shown. TIG welding by butt welding without welding wire under the following conditions:

[0054] The ...

Embodiment 2

[0066] Some steels having the chemical composition shown in Table 2 were melted in a vacuum furnace, cast into slabs, hot rolled to a thickness of 4.5 mm, annealed in the furnace at 780° C. for 12 hours and cooled as they were. Pickling annealed steel sheet, cold rolling to a thickness of 1.5mm, intermediate annealing at 800°C for 1 minute, cooling in the open air, cold rolling again to a thickness of 0.5mm and final annealing at 1030°C for 1 minute. Steel K in Table 2, corresponding to SUS 430LX, was exceptionally annealed at 1000° C. for 1 minute in both states of hot rolling and cold rolling.

[0067] The test blocks sampled from various stainless steel plates were plastically formed to have figure 1 The tire rim of the shape shown is TIG welded into a steel pipe with a diameter of 30mm. TIG welding was performed with a welding current of 150 A and a torch moving speed of 500 mm / min. Welded sections were adjusted by grinding the weld bead and then finished with the base m...

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Abstract

To provide a tire rim material and a frame material for using stainless steel-made two-wheeled vehcle, such as a bicycle, a motorcycle, excellent in deflecting resistance without damaging corrosion resistance in welded point and this heat-affected part caused by welding. This tire material has the steel composition composed by mass% of <=0.04% C, <=2.0% Si, <=2.0% Mn, 10.0-20.0% Cr, <=4.0% Ni, <=3.0% Cu, <=0.12% N and the balance substantially Fe. Further, this tire rim material has ferrite + martensite double phase structure having the martensite amount adjusted so that value of a sensitizing index St shown in the following formula (1) becomes in the range of -31 to <-7, and also, the steel plate having >=270 HV surface hardness, is formed as the blank. Then, the above formula is shown as the following. St=100C+30N-0.32[gamma]. Wherein, [gamma] is the martensite amount (%) at room temperature after annealing into the double phases. Further, this tire rim material can be contained of one or more elements among <=0.015% B, <=3.0% Mo, <=0.10% Ti, <=0.40% Nb and <=0.30% V. (C)2004,JPO.

Description

technical field [0001] The present invention relates to structural parts of two-wheeled vehicles such as bicycles, motorcycles and wheelchairs made of stainless steel excellent in corrosion resistance and bending resistance in the heat-affected zone of welding. Background technique [0002] The tire rims and frames of two-wheeled vehicles such as bicycles, motorcycles and wheelchairs are often exposed to corrosive atmospheres. In order to prolong the life, the material of these structural parts has been changed from plated steel plate to ferritic stainless steel plate, such as SUS304. The weldability of the material will also be good, since structural parts are usually manufactured by welding. [0003] Japanese Patent No. 73866A / 1986 proposes a method of adding Ti and Nb at a ratio of 0.1 to 0.3 mass % and 0.15 to 0.3 mass %, respectively, even if the toughness, ductility and corrosion resistance of the welded part are improved. 10 to 20% by mass Cr ferritic stainless stee...

Claims

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Application Information

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IPC IPC(8): B62K19/04B60B21/00C21D9/34C22C38/00C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
CPCC22C38/50C22C38/46C22C38/42C22C38/48C22C38/001C22C38/44
Inventor 富村宏纪藤本广森本宪一平松直人
Owner NISSHIN STEEL CO LTD