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Brake disc having high temper softening resistance

A brake disc and tempering treatment technology, applied in the direction of brake discs, manufacturing tools, furnace types, etc., can solve the problems of reduced hardness, insufficient resistance to temper softening, and high manufacturing costs

Inactive Publication Date: 2009-05-06
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the stainless steel for brake discs recorded in Japanese Patent Application Laid-Open No. 2002-146489, Japanese Patent No. 3315974, and Japanese Patent Laid-Open No. 2002-121656 has high manufacturing costs due to the addition of a large amount of expensive alloy elements, and The resistance to temper softening caused by frictional heat during braking is not sufficient, so when kept at a temperature above 650°C for a long time, there is a problem that the hardness decreases sharply

Method used

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  • Brake disc having high temper softening resistance
  • Brake disc having high temper softening resistance
  • Brake disc having high temper softening resistance

Examples

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Embodiment 1

[0091] 19 kinds of martensitic stainless steels having different compositions of A to S shown in Table 1 were melted in a high-frequency melting furnace (high-frequency melting furnace), and cast into a 50 kg ingot, and then, under generally known conditions hot rolled steel sheets with a thickness of 5 mm, and then, these hot rolled steel sheets were annealed at 800°C for 8 hours in a reducing atmosphere, then cooled slowly, and removed by pickling. The scale on the surface is made of hot-rolled annealed sheet. From these hot-rolled annealed sheets, a test piece having a thickness of 30 mm×30 mm was taken, and the test piece was quenched under the conditions shown in Tables 2-1 to 3. For the quenched test piece, observation of the metal structure, measurement of the amount of precipitated Nb, quenching stability test, temper softening test, and measurement of the dislocation density after quenching and tempering were performed according to the following methods. In addition,...

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Abstract

A brake disc that has appropriate hardness, exhibiting a high temper softening resistance. In particular, there is provided a brake disc having a high temper softening resistance, characterized in that it has a component composition comprising 0.1 mass% or less C, 1.0 mass% or less Si, 2.0 mass% or less Mn, 10.5 to 15.0 mass% Cr, 2.0 mass% or less Ni, over 0.5 to 4.0 mass% Cu, 0.02 to 0.3 mass% Nb and 0.1 mass% or less N, further comprising C, N, Nb, Cr, Si, Ni, Mn, Mo and Cu in amounts satisfying the formulae: 5Cr+10Si+15Mo+30Nb-9Ni-5Mn-3Cu-225N-270C<45 (1), and 0.03={C+N-(13 / 93)Nb}=0.09 (2), and still further comprising the balance Fe and unavoidable impurities, and that the brake disc has a martensite structure wherein the average diameter of former austenite grains is 8 [mu]m or greater, and that the hardness thereof is in the range of 32 to 38 in terms of HRC.

Description

technical field [0001] The present invention relates to brake discs that can be used for disc brakes (disc brakes) of motorcycles, automobiles, bicycles, etc. resistance) large brake disc. Here, "high resistance to temper softening" as used in the present invention refers to the characteristic that the softening after maintaining a high temperature is small and the hardness close to the initial appropriate hardness can be maintained. Background technique [0002] Brake discs used in motorcycles, automobiles, etc. use friction between the disc and brake linings to convert kinetic energy into heat energy, thereby inhibiting the rotation of the wheel and braking. Therefore, it is desired that the above-mentioned brake disc has proper hardness and is also excellent in wear resistance, toughness, and the like. Especially when the hardness of the brake disc is low, wear caused by friction with the brake lining becomes easy to develop, and furthermore, the braking ability (brakin...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/58C21D9/46F16D65/12
CPCC22C38/42C21D9/46C22C38/48C22C38/02C22C38/04C22C38/58F16D2200/0021F16D65/12
Inventor 平泽淳一郎山下孝子槙石规子滨田悦男宇城工古君修
Owner JFE STEEL CORP
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