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Steel plate and method of production of same

a technology of steel plate and ductility, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of deterioration of parts characteristics and increase of material strain, and achieves low hardness, high ductility, and increased grain size

Inactive Publication Date: 2018-08-16
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text discusses the use of a combination of ferrite and carbides in a steel plate to improve its cold forgeability and impact resistance. By increasing the grain size and forming carbides at the ferrite grain boundaries, the material becomes easier to shape and has better strength and wear properties. This makes it suitable for use in drive system parts and high cycle gears. The overall effect is a superior steel plate that can be easily formed and used in various applications.

Problems solved by technology

Compared with conventional hot forging etc., with cold forging, there is the problem that the amount of strain accumulated in the material becomes higher, cracks of the material and buckling at the time of shaping are invited, and deterioration of the part characteristics is caused.

Method used

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  • Steel plate and method of production of same
  • Steel plate and method of production of same
  • Steel plate and method of production of same

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examples

[0212]Next, examples will be explained, but the levels in the examples are illustrations of conditions employed for confirming the workability and effects of the present invention. The present invention is not limited to these illustrations of conditions. The present invention can employ various conditions so long as not deviating from the gist of the present invention and achieving the object of the present invention.

[0213]A continuously cast slab (steel ingot) having a chemical composition shown in Table 1 was heated at 1240° C. for 1.8 hours, then was used for hot rolling. The finish hot rolling was ended at 890° C., the steel was cooled on a ROT by a 45° C. / sec cooling rate down to 520° C. and was coiled up at 510° C. to produce a hot rolled coil with a plate thickness of 5.2 mm.

TABLE 1Chemical composition (mass %)No.CSiMnPSAlCrMoNOTiBRemarksA0.120.070.850.01540.00840.0310.5270.6360.00680.00030.00950.0004InventionsteelB0.130.030.760.00690.00460.0111.4830.0170.00570.01220.00390.0...

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Abstract

Low carbon steel plate excellent impact resistance characteristics after carburizing and quenching and after tempering, characterized by having a predetermined chemical composition, an average grain size of carbides of 0.4 μm to 2.0 μm, an area ratio of pearlite of 6% or less, a ratio of a number of carbides at the ferrite grain boundaries to the number of carbides inside the ferrite grains of over 1, and a Vickers hardness of 100HV to 180HV.

Description

TECHNICAL FIELD[0001]The present invention relates to steel plate and a method of production of the same.BACKGROUND ART[0002]Steel plate containing, by mass %, carbon in an amount of 0.1 to 0.4% is being used as a material for gears, clutches, and other drive system parts of automobiles by being used press-formed, enlarging holes, bent, drawn, thickened, and thinned and cold forged by combinations of the same from a blank. Compared with conventional hot forging etc., with cold forging, there is the problem that the amount of strain accumulated in the material becomes higher, cracks of the material and buckling at the time of shaping are invited, and deterioration of the part characteristics is caused.[0003]In particular, to obtain wear resistance, after the shaped material is carburized, quenched, and tempered, residual stress is caused by the heat treatment, so formation and growth of fracture from the cracked parts and buckled parts are invited. To use such a part for the drive sy...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21D8/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/06C22C38/04C22C38/02C22C38/00
CPCC21D9/46C22C38/60C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/06C22C38/04C22C38/02C22C38/008C22C38/005C22C38/002C22C38/001C21D8/0463C22C38/42C21D8/0205C21D8/0226C21D8/0263C22C38/22C22C38/28C22C38/32C23G1/08C21D2211/005
Inventor TAKEDA, KENGOHIKIDA, KAZUOTAKATA, KENHASHIMOTO, MOTONORITOMOKIYO, TOSHIMASATSUKANO, YASUSHIARAMAKI, TAKASHI
Owner NIPPON STEEL CORP