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Steel for high-speed cold working and method for production thereof, and high-speed cold working part and method for production thereof

A manufacturing method and cold working technology, applied in the field of mechanical parts and steel for cold working, can solve the problems of deterioration of metal mold life, easy cracking during processing, inability to ensure the strength of parts, etc., and achieve good cold workability and appropriate chemical composition.

Inactive Publication Date: 2008-07-02
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the specified part strength is ensured, the life of the metal mold will deteriorate and cracks will easily occur during processing
On the other hand, if the cold workability is improved in order to improve the life of the metal mold, the specified part strength cannot be ensured.
It has not been possible to obtain non-quenched and tempered steel for cold working in which these two properties coexist well.

Method used

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  • Steel for high-speed cold working and method for production thereof, and high-speed cold working part and method for production thereof

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Effect test

no. 1 approach

[0116] The steel for high-speed cold working according to the first embodiment of the present invention contains C: 0.03% to 0.15%, Si: 0.005% to 0.6%, Mn: 0.05% to 2%, P: 0.05% or less (excluding 0%), and S: 0.05% or less (excluding 0%) and N: 0.04% or less (excluding 0%), the balance is composed of iron and unavoidable impurities, and the amount of solid solution nitrogen in steel is 0.006% or more.

[0117] (C: 0.03% to 0.15%)

[0118] In the first embodiment of the present invention, in order to realize good machinability and cold workability, the upper limit of the amount of C is set to 0.15%. A more preferable upper limit is 0.12%. In order to secure the strength of the steel, the lower limit of C is 0.03%, preferably 0.04%.

[0119] Explanations other than the amount of C in the first embodiment of the present invention (namely, other basic components and optional components (arbitrary elements), manufacturing method of steel, manufacturing method of parts, balance of...

no. 2 approach

[0121] The steel for high-speed cold working according to the second embodiment of the present invention contains C: 0.15% to 0.6% but not including 0.15%, Si: 0.005% to 0.6%, Mn: 0.05% to 2%, and P: 0.05% or less (excluding 0%), S: 0.05% or less (excluding 0%) and N: 0.04% or less (excluding 0%), the balance is composed of iron and unavoidable impurities, and the content of N as a solid solution state is 0.006% above.

[0122] (C: 0.15% to 0.6% but not including 0.15%)

[0123] In the second embodiment of the present invention, the amount of C is set to exceed 0.15% in order to achieve higher component strength. More preferably, it is 0.16% or more, and it is still more preferable that it is 0.17% or more. On the other hand, when the amount of C is too large, machinability and cold workability deteriorate. Therefore, the upper limit of the amount of C is 0.6%, preferably 0.5%, more preferably 0.4%.

[0124] Explanations other than the amount of C in the second embodiment ...

no. 3 approach

[0126] In the third embodiment of the present invention, it is described about reducing the amount of elements (Al, Ti, Nb, V, Zr, B, Ta, Hf) that reduce solid solution N. Accordingly, a sufficient amount of solid-solution N can be secured, that is, good cold workability can be maintained, and higher component strength can be achieved.

[0127] That is, the steel for high-speed cold working according to the third embodiment of the present invention contains C: 0.03% to 0.6%, Si: 0.005% to 0.6%, Mn: 0.05% to 2%, P: 0.05% or less (excluding 0%), S : 0.05% or less (excluding 0%), N: 0.008 to 0.04%, and the balance is composed of iron and unavoidable impurities. Among the impurities, Al: 0.001% or less (excluding 0%), Ti: 0.002 % or less (excluding 0%), Nb: less than 0.001% (excluding 0%), V: less than 0.001% (excluding 0%), Zr: less than 0.001% (excluding 0%), B: less than 0.0001% (excluding 0%), Ta: 0.0001% or less (excluding 0%), Hf: 0.0001% or less (excluding 0%), and satisfy...

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Abstract

Disclosed herein is a steel for high-speed cold working which exhibits good cold workability during working and also exhibits high hardness after working. The steel for high-speed cold working contains C : 0.03 to 0.6% (by mass), Si : 0.005 to 0.6%, Mn : 0.05 to 2%, P : no more than 0.05% (excluding 0%), S : no more than 0.05% (excluding 0%), and N : no more than 0.04% (excluding 0%), with the remainder being iron and inevitable impurities and the amount of dissolved nitrogen in the steel being no less than 0.006%.

Description

technical field [0001] The present invention relates to steel for cold working, especially wire rod or steel bar for cold working, used for manufacturing machine parts such as bolts / nuts, especially automobile parts. The invention also provides cold-worked parts obtained from the steel for cold-working. Background technique [0002] In recent years, from the viewpoint of environmental protection, the fuel efficiency of vehicles such as automobiles has been improved to reduce the weight of parts. For general high-strength parts, the strength of the parts is ensured by increasing the amount of alloying elements added to iron. [0003] Compared with hot working and warm working, cold working (here refers to the processing under the atmosphere below 200 ℃) has the advantages of high productivity, excellent size and good yield of steel, so it is widely used in the manufacture of various parts. use. In addition, in order to further improve productivity, there is a trend of high...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18C22C38/32C22C38/38C22C38/52C21D9/00C21D7/02C21D11/00
Inventor 增田智一高知琢哉村上昌吾家口浩
Owner KOBE STEEL LTD
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