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Martensitic stainless steel with excellent non-rusting property for disk brake

A disc brake, stainless steel technology, applied in the field of martensitic stainless steel for disc brakes

Active Publication Date: 2014-04-02
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in JP-A-57-198249, JP-08-060309, JP-10-152760 and JP-2000 - In the invention described in Gazette No. 026941, although improvement in rust resistance can be seen, it is not sufficient, and steel for double-wheel disc brakes with further improved rust resistance is required

Method used

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  • Martensitic stainless steel with excellent non-rusting property for disk brake
  • Martensitic stainless steel with excellent non-rusting property for disk brake
  • Martensitic stainless steel with excellent non-rusting property for disk brake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] After smelting a steel slab with a thickness of 200 mm and having the chemical composition shown in Table 1, a hot-rolled sheet with a thickness of 6 mm was obtained by hot rolling. Furthermore, after heating to 850 degreeC, it left to cool gradually, and performed softening annealing.

[0062] Table 1 (mass%)

[0063]

[0064] Chart SEQ Chart \* ARABIC 1

[0065] * In the table, 0.0 (mass %) means no addition, and is contained as an unavoidable impurity below the analytical detection limit.

[0066] Table 1 (continued) (mass%)

[0067]

[0068] Chart SEQ Chart \* ARABIC 2

[0069] * In the table, 0.0 (mass %) means no addition, and is contained as an unavoidable impurity below the analytical detection limit.

[0070] Rust resistance evaluation test pieces and hardenability evaluation test pieces were collected from these steel sheets, and the remaining steel sheets were quenched by water cooling after holding at 950 to 1000° C. for 10 minutes.

[0071] In ...

Embodiment 2

[0086] Steel slabs with a thickness of 200 mm having the chemical composition shown in Table 3 were melted. It is a component system containing P and Bi in trace amounts. And no Sb was added. Thereafter, various evaluation test pieces were produced by the same method as in Example 1. In addition, a rust resistance test, a hardenability test, and a temper softening test were performed by the same method as in Example 1. The evaluation results are shown in Table 4.

[0087] Table 3 (mass%)

[0088]

[0089] * In the table, 0.0 (mass %) means no addition, and is contained as an unavoidable impurity below the analytical detection limit.

[0090] Table 4

[0091]

[0092] BA steel to BL steel are the steels of the present invention, and the rust resistance before and after quenching is acceptable, and the quenching hardness and heat resistance temperature are also acceptable, showing very excellent properties. On the other hand, BM steel, which is a comparative steel,...

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PUM

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Abstract

A martensitic stainless steel having excellent non-rusting properties for use in disk brakes which is characterized by containing, in terms of mass%, 0.01-0.10% C, 0.05-2% Si, 0.2-2.0% Mn, up to 0.01% S, 0.005-0.025% N, 10-14% Cr, 0.02-2% Ni, 0.001-0.1% Al, and up to 0.5% V, with C+N being 0.06-0.1%, further containing either (i) one or more of P, As, Sb, and Bi in a total amount of 0.05-0.5% or (ii) 0.005-0.05% P and 0.005-0.05% Bi, provided that the sum of both is 0.01-0.05%, and optionally further containing Cu, Ti, Mo, and Nb in given amounts, with the remainder being Fe and unavoidable impurities. It is further characterized in that ?p expressed by the following (equation 1) is 80 or larger. ?p=420[%C]+470[%N]+23[%Ni]+9[%Cu]+7[%Mn]-11.5[%Cr]-11.5[%Si]-52[%Al]-12[%Mo]-47[%Nb]+189 (equation 1)

Description

technical field [0001] The present invention relates to a martensitic stainless steel for a disc brake of a two-wheeled vehicle, and relates to a martensitic stainless steel for a disc brake excellent in rust resistance. Background technique [0002] Disc brakes for two-wheeled vehicles require properties such as wear resistance, rust resistance, and toughness. In general, the higher the hardness, the greater the wear resistance. On the other hand, if the hardness is too high, there will be so-called brake squealing between the brake and the pad, so the hardness of the brake is required to be 32 to 38HRC (according to JIS Z 2245. Rockwell C standard). From these required characteristics, martensitic stainless steel has been used as a material for disc brakes of two-wheeled vehicles. [0003] Conventionally, brakes were produced by quenching and tempering SUS420J2 (specified in JIS G 4304) to adjust to a desired hardness. However, in this case, two heat treatment steps of q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/48C22C38/60C22C38/44C22C38/42C22C38/04C22C38/58C22C38/50C22C38/002C21D1/55C22C38/46C22C38/02
Inventor 井上宜治本间穗高
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP