Steel sheet for soft nitriding and process for producing same

A manufacturing method and soft nitriding technology, which are applied in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve the problems of long time required for nitriding, and achieve the effects of excellent fatigue resistance and reduction of manufacturing costs.

Inactive Publication Date: 2015-03-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of gas nitriding using ammonia gas, the time required for nitriding is remarkably long, ranging from about 25 hours to about 150 hours, and it is not suitable for automotive parts, etc. that are predicated on mass production.

Method used

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  • Steel sheet for soft nitriding and process for producing same
  • Steel sheet for soft nitriding and process for producing same
  • Steel sheet for soft nitriding and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] Steel containing the chemical components shown in Table 1 was melted, ingot-cast and billet-rolled to form steel sheets. After these steel sheets were heated, rough rolling and finish rolling were performed, and immediately after finishing rolling, cooling and coiling were performed to obtain hot-rolled steel sheets with a thickness of 3.2 mm. In addition, the heating temperature, finish rolling temperature, average cooling rate from the finish rolling temperature to the coiling temperature, and the coiling temperature of the above-mentioned steel sheets are shown in Table 2.

[0102]

[0103]

[0104] The hot-rolled steel sheet obtained above was pickled to remove scale, and temper rolling with an elongation of 0.5% was performed. Then, test pieces were cut out from the temper-rolled steel sheets and used for the following evaluations.

[0105] (i) Solid solution V amount

[0106] Regarding the solid-solution V content, a test piece was cut from the 1 / 4 position ...

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Abstract

Provided is a steel sheet for soft nitriding which is excellent in terms of formability and fatigue resistance. The steel sheet for soft nitriding has a composition which contains, in terms of mass%, 0.05-0.10% C, up to 0.5% Si, 0.7-1.5% Mn, up to 0.05% P, up to 0.01% S, 0.01-0.06% Al, 0.5-1.5% Cr, 0.03-0.30% V, and up to 0.005% N and in which the ratio of the amount of V present as solid solution to the V content [(solid-solution V amount) / (V content)] exceeds 0.50, with the remainder comprising Fe and unavoidable impurities. The steel sheet has a composite structure which comprises ferrite and pearlite.

Description

technical field [0001] The present invention relates to a steel sheet for nitrocarburizing suitable for mechanical structural parts such as automobile transmission parts requiring fatigue strength and wear resistance, and in particular to steel sheets for nitrocarburizing that are excellent in formability before nitrocarburizing and after nitrocarburizing A steel sheet for nitrocarburizing excellent in fatigue resistance and a method for producing the same. Background technique [0002] Fatigue strength and wear resistance are required for mechanical structural parts that are continuously used under a stress load for a long period of time, such as transmission parts for automobiles. Therefore, these parts for machine structures are usually produced by processing a steel material into a desired part shape and then subjecting it to a case hardening heat treatment. When the surface hardening heat treatment is performed, the surface of the steel is hardened, and compressive res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/26
CPCC23C8/26C21D2211/009C22C38/06C22C38/26C21D9/46C22C38/02C21D2211/005C22C38/04C22C38/001C22C38/00C22C38/24C22C38/38C21D8/0226C21D8/0263C21D6/002C21D6/005C21D6/008C21D8/0205
Inventor 小林崇中村展之船川义正
Owner JFE STEEL CORP
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