MX2019004536A - Steel sheet for carburizing, and production method for steel sheet for carburizing. - Google Patents

Steel sheet for carburizing, and production method for steel sheet for carburizing.

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Publication number
MX2019004536A
MX2019004536A MX2019004536A MX2019004536A MX2019004536A MX 2019004536 A MX2019004536 A MX 2019004536A MX 2019004536 A MX2019004536 A MX 2019004536A MX 2019004536 A MX2019004536 A MX 2019004536A MX 2019004536 A MX2019004536 A MX 2019004536A
Authority
MX
Mexico
Prior art keywords
equal
less
steel sheet
carburizing
carbides
Prior art date
Application number
MX2019004536A
Other languages
Spanish (es)
Inventor
Yuri Toda
Kazuo Hikida
Motonori Hashimoto
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of MX2019004536A publication Critical patent/MX2019004536A/en

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    • C21D1/06—Surface hardening
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    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
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    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
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    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Abstract

[Objeto] Para proveer una lámina de acero para carburación teniendo además conformabilidad mejorada y tenacidad después de carburación, y un método para fabricar el mismo. [Solución] Una lámina de acero que consta de, en % en masa, C: mayor que o igual a 0.02% y menor que 0.30%, Si: mayor que o igual a 0.005%, y menor o igual a 0.5%, Mn: mayor que o igual a 0.01%, y menor o igual a 3.0%, P: menor o igual a 0.1%, S: menor o igual a 0.1%, sol. Al: mayor que o igual a 0.0002%, y menor o igual a 3.0%, N: mayor que o igual a 0.0001, y menor o igual a 0.035%, y el resto: Fe e impurezas, en el cual el grano cristalino promedio el tamaño de ferrita es menor que 10 µm, el diámetro promedio del círculo equivalente del carburo es 5.0 µm o menor, el porcentaje del número de carburos con una relación de aspecto de 2.0 o menor es del 80% o superior en relación con los carburos totales, el porcentaje del número de carburos presentes en el grano de cristal de ferrita es del 60% o superior en relación con los carburos totales y el promedio la concentración de nitrógeno en una región que varía de la superficie superior de la lámina de acero hasta una profundidad de 50 µm es de 0.040% en masa o superior y de 0.200% en masa o inferior.[Object] To provide a steel sheet for carburizing further having improved formability and toughness after carburizing, and a method for manufacturing the same. [Solution] A steel sheet consisting of, in % by mass, C: greater than or equal to 0.02% and less than 0.30%, Si: greater than or equal to 0.005%, and less than or equal to 0.5%, Mn : greater than or equal to 0.01%, and less than or equal to 3.0%, P: less than or equal to 0.1%, S: less than or equal to 0.1%, g. Al: greater than or equal to 0.0002%, and less than or equal to 3.0%, N: greater than or equal to 0.0001, and less than or equal to 0.035%, and the rest: Fe and impurities, in which the average crystal grain the ferrite size is less than 10 µm, the average diameter of the carbide equivalent circle is 5.0 µm or less, the percentage of the number of carbides with an aspect ratio of 2.0 or less is 80% or more relative to the carbides total carbides, the percentage of the number of carbides present in the ferrite crystal grain is 60% or more relative to the total carbides and the average nitrogen concentration in a region ranging from the upper surface of the steel sheet to a depth of 50 µm is 0.040 mass% or greater and 0.200 mass% or less.

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