CN106435388A - Carburized steel and method of manufacturing the same - Google Patents

Carburized steel and method of manufacturing the same Download PDF

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Publication number
CN106435388A
CN106435388A CN201510902789.4A CN201510902789A CN106435388A CN 106435388 A CN106435388 A CN 106435388A CN 201510902789 A CN201510902789 A CN 201510902789A CN 106435388 A CN106435388 A CN 106435388A
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China
Prior art keywords
carburizing
amount
carburizing steel
steel compositions
steel
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朴栽弘
姜旻佑
潘炯旿
金赫
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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Publication of CN106435388A publication Critical patent/CN106435388A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C8/06—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 using gases
    • C23C8/08—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 using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C8/06—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 using gases
    • C23C8/34—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 using gases more than one element being applied in more than one step
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C8/60—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 using solids, e.g. powders, pastes
    • C23C8/78—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 using solids, e.g. powders, pastes more than one element being applied in more than one step

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  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
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Abstract

A carburized steel composition of the present invention comprises: silicon (Si) in an amount of about 0.7 to 1.3 wt %, nickel (Ni) in an amount of about 0.15 to 0.5 wt %, chromium (Cr) in an amount of about 2.0 to 2.8 wt %, molybdenum (Mo) in an amount of about 0.15 to 0.5 wt %, vanadium (V) in an amount of about 0.02 to 0.1 wt % and nitrogen (N) in an amount of about 0.01 to 0.02 wt %, and iron (Fe) constituting the remaining balance of the carburized steel composition, all the wt % based on the total weight of the carburized steel composition.

Description

Carburizing steel and its manufacture method
Cross reference to related applications
This application claims August in 2015 Korean Patent to Korean Intellectual Property Office's submission on the 12nd Apply for priority and the rights and interests of No. 10-2015-0113991, entire contents are incorporated by reference into Herein.
Invention field
A kind of the present invention relates to carburizing steel and combinations thereof, and the manufacture further to carburizing steel Method.
Background technology
Generally, vehicle transmission gear (is shaved by such as forging Steel material, normalizing or annealing, processing Cut processing ＆ gear hobbing process), the continuous processing manufacture of carburizing heat treatment and nitriding heat treatment.
As conventional material, chromium (Cr) steel alloy, chromium-molybdenum (Cr-Mo) steel alloy, nickel- Chromium-molybdenum (Ni-Cr-Mo) steel alloy etc. has been widely used as actuating device steel alloy.Due to car Travelling gear (transmission gear) has general shape by forging, is had by processing There is accurate shape, these steel alloys should have excellent malleability and workability.
For example, chromium alloyed steel and chromium-molybdenum alloy steel price are low, but its fatigue behaviour and impact property Unexcellent, therefore, they are mainly used in loading not high actuating device.
And, Ni-Cr-Mo alloy steel has that price is high and unmanageable due to contained nickel Shortcoming.But, its fatigue behaviour and impact property are very excellent, and therefore, they are mainly used in bearing Carry high gear.
In the situation of common actuating device, driving member (gear) is interlocked with one another, and has contact Stress, thus leading to the spot corrosion on transmission component surface, this can lead to durability to reduce, And produce noise.Specifically, when dynamical system size reduction, miniaturization and power high from And when increasing actuating device load, problem increases.
Accordingly, it would be desirable to the transmission dress that exploitation contact fatigue life (for example, pitting resistance) improves Put.
Above- mentioned information disclosed in this background parts is used only for strengthening the understanding to background of invention, because This, its can contain be not formed in those of ordinary skill in the art in this country it is known that show There is the information of technology.
Content of the invention
On the one hand, the present invention provides a kind of carburizing steel and combinations thereof.
On the other hand, the present invention provides the manufacture method of carburizing steel.
The illustrative embodiments of the present invention provide a kind of carburizing steel compositions, and it can include： The silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, about 2.0-2.8 The chromium (Cr) of wt%, the molybdenum (Mo) of about 0.15-0.5wt%, the vanadium of about 0.02-0.1wt% (V), the nitrogen (N) of about 0.01-0.02wt% and the ferrum (Fe) constituting carburizing steel compositions surplus, All wt% are based on the gross weight of carburizing steel compositions.
And, carburizing steel compositions may further include：The carbon (C) of about 0.15-0.25wt%, The manganese (Mn) of about 0.3-1.0wt%, about 0.03wt% or lower but more than 0wt% phosphorus (P), about 0.03wt% or lower but more than the sulfur (S) of 0wt%, about 0.3wt% or more Low but more than the copper (Cu) of 0wt%, the niobium (Nb) of about 0.01-0.05wt% and about The aluminum (Al) of 0.01-0.05wt%, all wt% are based on the gross weight of carburizing steel compositions.
Further provide for be grouped into, being substantially grouped by described herein group by described herein group Become or mainly by the described herein group of carburizing steel compositions being grouped into.For example, carburizing steel compositions Can composed of the following components, consisting essentially of or main consisting of described component For：The silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, about The chromium (Cr) of 2.0-2.8wt%, the molybdenum (Mo) of about 0.15-0.5wt%, about 0.02-0.1wt% Vanadium (V), the nitrogen (N) of about 0.01-0.02wt% and constitute carburizing steel compositions surplus Ferrum (Fe), all wt% are based on the gross weight of carburizing steel compositions.Additionally, carburizing steel combination Thing can composed of the following components, consisting essentially of or main consisting of described group It is divided into：The silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, about The chromium (Cr) of 2.0-2.8wt%, the molybdenum (Mo) of about 0.15-0.5wt%, about 0.02-0.1wt% Vanadium (V), the nitrogen (N) of about 0.01-0.02wt%, the carbon (C) of about 0.15-0.25wt%, The manganese (Mn) of about 0.3-1.0wt%, about 0.03wt% or lower but more than 0wt% phosphorus (P), about 0.03wt% or lower but more than the sulfur (S) of 0wt%, about 0.3wt% or more Low but more than the copper (Cu) of 0wt%, the niobium (Nb) of about 0.01-0.05wt%, about 0.01-0.05 The aluminum (Al) of wt% and the ferrum (Fe) constituting carburizing steel compositions surplus, all wt% are based on The gross weight of carburizing steel compositions.
Preferably for carburizing steel compositions, can have the value of about 12.5-14 with following formula 1：
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
In formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, Cr, The addition (wt%) of Mo, V and N.
Another exemplary embodiment of the present invention provides a kind of manufacture method of carburizing steel, and it can To include：To include the silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, The chromium (Cr) of about 2.0-2.8wt%, the molybdenum (Mo) of about 0.15-0.5wt%, about 0.02-0.1 More than the nitrogen (N) of the vanadium (V) of wt% and about 0.01-0.02wt% and composition carburizing steel compositions The Steel material of the ferrum (Fe) of amount carries out carburizing, and all wt% are based on the total of carburizing steel compositions Weight.Specifically, carburizing can be carried out under about 930-1050 DEG C of heat treatment temperature.
Preferably for carburizing steel compositions, can have the value of about 12.5-14 with following formula 1.
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
In formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, Cr, The addition (wt%) of Mo, V and N.
Preferably, the carbon potential in carburizing (CP) can be about 0.85-1.1.
Steel material may further include：The carbon (C) of about 0.15-0.25wt%, about 0.3-1.0 The manganese (Mn) of wt%, about 0.03wt% or lower but the phosphorus (P), about more than 0wt% 0.03wt% or lower but more than the sulfur (S) of 0wt%, about 0.3wt% or lower but be more than 0wt The copper (Cu) of amount, the niobium (Nb) of about 0.01-0.05wt% and about 0.01-0.05wt%'s Aluminum (Al), all wt% are based on the gross weight of carburizing steel compositions.
Preferably, after carburization, may further include the step that nitriding is carried out to Steel material. Nitridation steps can be in the ammonia (NH containing about 0.5-2vol%3) atmosphere under about Carry out under 820-870 DEG C of temperature range.
Can be by any one or more in forging, normalizing, annealing and processing by Steel material It is manufactured into the actuating device shape of reservation.
Further provide for the vehicle part including carburizing steel compositions described herein.For example, vehicle Part can be actuating device.
Further it is provided that include the vehicle part containing carburizing steel compositions described herein being for example driven The vehicle of device.
According to each illustrative embodiments of the present invention it is provided that pitting resistance improve carburizing steel. Furthermore, it is possible to provide the actuating device of pitting resistance raising using carburizing steel.
Following discloses other aspects of the present invention.
Brief description
Term used herein is merely for the sake of the purpose of description specific embodiment, and is not intended to In being limited to invention.As used herein, unless context is clearly it is further noted that odd number shape " one " of formula, " one " and " this kind " are intended to also include plural form.Should be further understood that Arrive, when used as contemplated in this specification, term " inclusion " and/or " including " illustrate exist Feature, integer, step, operation, element and/or the composition stated, but be not precluded from presence or add Other features of plus one or more, integer, step, operation, element, composition and/or its group Close.As used herein, term "and/or" include any of associations listed by one or more and All combine.
Unless expressly stated or from context it is obvious that as used herein, term " about " is managed Solution becomes in the normal tolerance range of this area, for example, in 2 standard deviations of meansigma methodss." big About " can be understood as described numerical value 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%th, in 2%, 1%, 0.5%, 0.1%, 0.05% or 0.01%.Unless in addition by context very Substantially, all numerical value provided herein is modified by term " about ".
Further, it will be appreciated that arriving, term " vehicle " used herein, " automobile-used " or other class Include common motor vehicles, such as passenger carrying vehicle like term, including SUV (SUV), bus, truck, various commerial vehicle, including the water of various ships and ship Fortune instrument, airborne vehicle and analog, and include motor vehicle driven by mixed power, electric vehicle, plug-in Hybrid electric vehicle, hydrogen-powered vehicle and other alternative fuel vehicle are (for example, from stone The fuel of the resource beyond oil).As used herein, motor vehicle driven by mixed power is that have two or more The vehicle of kind of power resources, for example, petrol power and electrodynamic vehicle.
The advantage of the present invention and feature and its implementation are by by the example below in conjunction with detailed description Property embodiment explanation.But, the present invention is not limited to exemplary embodiments disclosed below, But will implement in every way.The illustrative embodiments of the present invention are carried out to the present invention Sufficiently disclose, and be provided so that those skilled in the art it will be readily appreciated that the present invention's Scope.Therefore, the present invention will be defined by the appended claims.In the description, class As reference number refer to similar part.
Therefore, in some illustrative embodiments, known technology will not be illustrated, To avoid the understanding of the present invention unclear.Unless herein in addition defined, make in description All terms (including technology and scientific terminology) are respectively provided with those skilled in the art and generally manage The implication of solution.Can be included according to the carburizing steel compositions of exemplary embodiment of the invention：Greatly The silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, about 2.0-2.8wt% Chromium (Cr), the molybdenum (Mo) of about 0.15-0.5wt%, the vanadium (V) of about 0.02-0.1wt% The nitrogen (N) of about 0.01-0.02wt% and the ferrum (Fe) constituting carburizing steel compositions surplus, All wt% are based on the gross weight of carburizing steel compositions.
And, carburizing steel compositions may further include：The carbon (C) of about 0.15-0.25wt%, The manganese (Mn) of about 0.3-1.0wt%, about 0.03wt% or lower but more than 0wt% phosphorus (P), about 0.03wt% or lower but more than the sulfur (S) of 0wt%, about 0.3wt% or more Low but more than the copper (Cu) of 0wt%, the niobium (Nb) of about 0.01-0.05wt% and about The aluminum (Al) of 0.01-0.05wt%, all wt% are based on the gross weight of carburizing steel compositions.
Carburizing steel compositions can meet with following formula 1, to have the value of about 12.5-14：
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
In formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, Cr, The addition (wt%) of Mo, V and N.
The reason limit component is as follows：
As used herein, carbon (C) can increase intensity and the hardness of material, and carbide precipitate. When carbon is included with the amount of about 0.15-0.25wt%, during carburizing, carbon spread can be easy to.And And, when carbon with less than about 0.15wt% includes when, tensile strength can be deteriorated, when carbon is with big When about 0.30wt% includes, impact flexibility can be deteriorated.
As used herein, silicon (Si) can the amount of about 0.7-1.3wt% add, hard to increase Degree, elastic modelling quantity etc., and strengthen ferrite phase.And, resistance to softening at high temperature can improve, To reduce the incidence rate that hardness reduces.When silicon with less than about 0.7wt% includes when, intercrystalline oxygen Change can occur in a large number, when silicon with more than about 1.3wt% includes when, stretch value and impact value can To reduce.
As used herein, manganese (Mn) can about 0.3wt% or bigger amount add, with increase Plus quenching characteristics and intensity, but, when manganese with more than about 1.0wt% includes when, processing characteristics Can be deteriorated.
As used herein, phosphorus (P) can be more than about 0.03wt%, more specifically more than about The amount of 0.02wt% is added, and therefore can form Fe3P.Fe3P can isolate, even if therefore Even if being also difficult to homogenizing in the situation of annealing, being extended by forging rolling, making deterioration of impact resistance, And promote temper brittleness.
As used herein, sulfur (S) can form MnS, to improve machining property.But, When sulfur is to add more than about 0.03wt%, intensity can reduce.
As used herein, chromium (Cr) can the amount of about 2.0wt% or bigger add, thus logical Percarbide separates out and improves resistance to temperability, and improves quenching characteristics.But, when chromium is with big When about 2.8wt% adds, can occur for example to produce the problem of net carbide.
As used herein, molybdenum (Mo) can about 0.15wt% or bigger amount add, to carry High-hardenability, prevents temper brittleness, and makes distribution of carbides uniform.The upper limit of molybdenum is not subject to specifically Limit, but in view of feasibility economically, molybdenum can the amount of about 0.5wt% or lower add.
As used herein, nickel (Ni) can about 0.15wt% or bigger amount add, to change Kind steel construction.Nickel can be austenite or ferrite, to strengthen substrate, improves quenching degree, and Increase contact fatigue life.The upper limit of nickel is not particularly limited, but feasible in view of economically Property, nickel can about 0.5wt% or lower amount add.
When to add more than about 0.3wt%, copper (Cu) can make hot-workability be deteriorated, and Produce red brittleness.
Niobium (Nb) can about 0.01wt% or bigger amount add, to improve crystallite and carbonization Thing.The upper limit of niobium is not particularly limited, but in view of feasibility economically, nickel can be about The amount of 0.5wt% or lower is added.
Vanadium (V) can about 0.02wt% or bigger amount add, to produce Refined Carbide Particle, Thus improving steel construction, and improve resistance to temperability.But, when vanadium is with more than predetermined amount During interpolation, the high oxide V of vapour pressure can be formed2O5, thus gasifying at high temperature.Therefore, Vanadium can about 0.1wt% or lower amount add.
Aluminum (Al) can about 0.01wt% or bigger amount add so that imperceptibly analysing in steel Go out AlN, thus improving austenite crystallite.But, when aluminum is with the amount more than about 0.05wt% During interpolation, embrittlement can occur.
Nitrogen (N) can about 0.01wt% or bigger amount add, to increase yield strength, and Form nitride, thus improving austenite crystallite.But, when nitrogen is with more than about 0.02wt% Amount add when, percentage elongation can be deteriorated.
Specifically, for carburizing steel compositions, following formula can have the value of about 12.5-14.
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
In formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, Cr, The addition (wt%) of Mo, V and N.
And, when the value of following formula 1 is less than about 12.5, the softening resistance under high temperature can drop Low, thus increasing the incidence rate of spot corrosion.Additionally, when the value of formula 1 is more than about 14, hardness Can increase, so that processability is deteriorated.
Furthermore, it is possible to the less carburizing steel crystallite of preferable particle size, because such carburizing steel has There are the favorable characteristics of abnormal crystallite at a temperature of more than about 1150 DEG C.
The size of crystallite can be relevant with intensity, and according to Hall-Petch equation, the size of crystallite is got over Little, intensity and toughness improve more.
Above-mentioned carburizing steel could be for the carburizing steel of vehicle transmission gear.
Hereinafter, by the illustrative embodiments of the present invention, carburizing steel manufacture method will be entered Row explanation.
As described above, Steel material can include：The silicon (Si) of about 0.7-1.3wt%, about The nickel (Ni) of 0.15-0.5wt%, the chromium (Cr) of about 2.0-2.8wt%, about 0.15-0.5wt% Molybdenum (Mo), the vanadium (V) of about 0.02-0.1wt% and about 0.01-0.02wt% nitrogen (N) With the ferrum (Fe) constituting carburizing steel compositions surplus, all wt% are based on carburizing steel compositions Gross weight.
Preferably for carburizing steel compositions, can have the value of about 12.5-14 with following formula 1.
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
In formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, Cr, The addition (wt%) of Mo, V and N.
Steel material may further include：The carbon (C) of about 0.15-0.25wt%, about 0.3-1.0 The manganese (Mn) of wt%, about 0.03wt% or lower but the phosphorus (P), about more than 0wt% 0.03wt% or lower but more than the sulfur (S) of 0wt%, about 0.3wt% or lower but be more than 0 The copper (Cu) of wt%, the niobium (Nb) of about 0.01-0.05wt% and about 0.01-0.05wt% Aluminum (Al), all wt% are based on the gross weight of carburizing steel compositions.The composition limit of Steel material Determine reason identical with the restriction reason of above-mentioned carburizing steel compositions.
Furthermore, it is possible to will by any one or more in forging, normalizing, annealing and processing Steel material is manufactured into predetermined actuating device shape.
Specifically, Steel material can be by having the material forge hot with Steel material same composition Or cold forging and then it is carried out with normalizing or annealing and processes (shave process ＆ gear hobbing process) It is manufactured into those Steel materials of predetermined transmission device for vehicle shape.
Steel material can be carburizing.Specifically, when carburizing, heat treatment temperature can be big About 930-1050 DEG C.
In the Steel material composition system of exemplary embodiment of the invention, at the heat of Steel material When reason is carried out at a temperature of less than about 930 DEG C, carbide can separate out, and work as heat treatment and exist When carrying out at a temperature of higher than about 1050 DEG C, crystallite can grow.
And, in carburizing, carbon potential (CP) can be about 0.85-1.1.
When CP is less than about 0.85, hardness after carburizing, can be occurred to reduce, when CP is more than When about 1.1, carbide can separate out.
When carburizing completes, the step to Steel material nitriding can be carried out.
Nitridation steps can be in the ammonia (NH of injection 0.5-2vol%3) gas (with respect to furnace atmosphere) Under conditions of carry out under about 820-870 DEG C of temperature range.
Here, when nitriding temperature is less than about 820 DEG C, from will not occur, ammonia will not for ammonolysis Diffusion, when nitriding temperature is higher than about 870 DEG C, can occur serious thermal deformation in etching.
And, work as NH3When gas is to inject less than about 0.5vol%, nitriding will not be shown Effect (austenite residual volume increases, and quenching degree improves), works as NH3Gas is with more than about 2vol% During injection, durability can be made to be deteriorated by forming nitride.
It is additionally, since the Nitrizing Treatment time with component requirements change, it is not specifically formulated.
Specific embodiment
Embodiment
Hereinafter, by embodiment, the present invention will be described in detail.But, following examples Only the present invention will be described, and the disclosure is not limited by following EXPERIMENTAL EXAMPLE.
In the situation of the steel alloy that pitting corrosion resistance improves, it should have after carburizing heat treatment There is high surface hardness, and there is at about 300 DEG C excellent resistance to temperability.
The element of application claims is defined as Si, Cr, Ni, Mo and V, to connecing after carburizing Tactile fatigue life is compared, thus result is shown in table 1 below.In Table 1, all surveys Examination data obtains all under 0.9 CP, and P, Cu, S and Al all at identical conditions, survey Examination is carried out in following content ratio：P：0.01wt%, Cu：0.1wt%, S：0.01wt% and Al： 0.03wt%.
But, in the situation of Mo, its addition is that equivalent sets, because amount is natively Greatly, bigger amount leads to cost burden.
1) increase with from #1 to #5 pitting corrosion resistance parameter (described in lower one page), at 80 DEG C Contact fatigue life increase, but increment is little.
2) increase with from #1 to #5 pitting corrosion resistance parameter (described in lower one page), at 100 DEG C Contact fatigue life increase, increment is big.
Under conditions of temperature is higher, element is more significantly for the impact of resistance to temperability.
3) pitting corrosion resistance parameter is higher, and after quenching, material hardness is higher.
4) show the experimental data about V：0.02% (#6 experiment), about the experiment of V Data：0.1% (#5 experiment), about the experimental data of pitting corrosion resistance parameter：12.5 (#2 and #3 Experiment), and the experimental data about pitting corrosion resistance parameter：14 (#5 experiments).
And, the steel grade of application invention and exploitation carburizing and nitriding heat treatment method, to physics Property is evaluated as a result, the evaluation of physical properties result shown in table 2 below can be obtained.
Table 2：The comparison sheet of evaluation of physical properties
1) in the situation of the materials application routine carburizing to invention and nitriding method, with routine side Method is compared, because net carbide, contact fatigue result is simultaneously bad.
2) when the carburizing invented and nitriding method are applied to the material invented, it is obtained in that best Pitting corrosion resistance.
Although refer to the attached drawing is illustrated to the illustrative embodiments of the present invention, this area skill Art personnel will recognize that, can enter on the premise of without departing from spirit or essential characteristics of the present invention The various improvement of row and change.
Thus, it is to be understood that, above-mentioned example embodiment is not determinate, but It is illustrative in all respects.It is to be understood that the scope of the present invention will by following right Ask restriction, rather than by above-mentioned detailed description, by the implication of claim, scope with wait Tongfang All mode of ameliorating that formula draws and variation pattern are included within the scope of the present invention.
Although present invention combination is regarded as illustrative embodiments person at present and is described, but it should Understand, the present invention is not limited to disclosed illustrative embodiments, but on the contrary, is intended to Cover including the various change mode within spirit and scope defined in the appended claims and wait Same mode.

Claims (15)

1. a kind of carburizing steel compositions, it includes：
The silicon (Si) of about 0.7-1.3wt%；
The nickel (Ni) of about 0.15-0.5wt%；
The chromium (Cr) of about 2.0-2.8wt%；
The molybdenum (Mo) of about 0.15-0.5wt%；
The vanadium (V) of about 0.02-0.1wt%；
The nitrogen (N) of about 0.01-0.02wt%；With
Constitute the ferrum (Fe) of described carburizing steel compositions surplus,
All wt% are based on the gross weight of described carburizing steel compositions.
2. carburizing steel compositions according to claim 1, wherein for described carburizing steel group Compound, following formula 1 has the value of about 12.5-14：
Formula 1
=(5/8* (1+log √ [Si])) * (log ([Ni])+10))+2* (1+log ([Cr]))+√ ([Mo]) * 5+ √([V])*3+√([N])*100
Wherein in formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, The weight percent content of Cr, Mo, V and N.
3. carburizing steel compositions according to claim 1, it also includes：
The carbon (C) of about 0.15-0.25wt%；
The manganese (Mn) of about 0.3-1.0wt%；
About 0.03wt% or lower but more than 0wt% phosphorus (P)；
About 0.03wt% or lower but more than 0wt% sulfur (S)；
About 0.3wt% or lower but more than 0wt% copper (Cu)；
The niobium (Nb) of about 0.01-0.05wt%；With
The aluminum (Al) of about 0.01-0.05wt%,
All wt% are based on the gross weight of described carburizing steel compositions.
4. carburizing steel compositions according to claim 1, it is substantially by following components group Become：
The silicon (Si) of about 0.7-1.3wt% amount；
The nickel (Ni) of about 0.15-0.5wt% amount；
The chromium (Cr) of about 2.0-2.8wt% amount；
The molybdenum (Mo) of about 0.15-0.5wt% amount；
The vanadium (V) of about 0.02-0.1wt% amount；
The nitrogen (N) of about 0.01-0.02wt% amount；With
Constitute the ferrum (Fe) of described carburizing steel compositions surplus,
All wt% are based on the gross weight of described carburizing steel compositions.
5. carburizing steel compositions according to claim 1, it is substantially by following components group Become：
The silicon (Si) of about 0.7-1.3wt% amount；
The nickel (Ni) of about 0.15-0.5wt%；
The chromium (Cr) of about 2.0-2.8wt%；
The molybdenum (Mo) of about 0.15-0.5wt%；
The vanadium (V) of about 0.02-0.1wt%；
The nitrogen (N) of about 0.01-0.02wt%；
The carbon (C) of about 0.15-0.25wt%；
The manganese (Mn) of about 0.3-1.0wt%；
About 0.03wt% or lower but more than 0wt% phosphorus (P)；
About 0.03wt% or lower but more than 0wt% sulfur (S)；
About 0.3wt% or lower but more than 0wt% copper (Cu)；
The niobium (Nb) of about 0.01-0.05wt%；
The aluminum (Al) of about 0.01-0.05wt%, and
Constitute the ferrum (Fe) of described carburizing steel compositions surplus,
All wt% are based on the gross weight of described carburizing steel compositions.
6. a kind of method manufacturing carburizing steel, it comprises the following steps：
To include the silicon (Si) of about 0.7-1.3wt%, the nickel (Ni) of about 0.15-0.5wt%, The chromium (Cr) of about 2.0-2.8wt%, the molybdenum (Mo) of about 0.15-0.5wt%, about 0.02-0.1 More than the vanadium (V) of wt%, the nitrogen (N) of about 0.01-0.02wt% and composition carburizing steel compositions The Steel material of the ferrum (Fe) of amount carries out carburizing, and all wt% are based on the gross weight of described Steel material Amount,
Wherein said carburizing is carried out under about 930-1050 DEG C of heat treatment temperature.
7. method according to claim 6, wherein for described Steel material, following formula 1 has There is the value of about 12.5-14：
Formula 1=
(5/8*(1+log√[Si]))*(log([Ni])+10))+2*(1+log([Cr]))+√([Mo])*5+ √([V])*3+√([N])*100
Wherein in formula 1, [Si], [Ni], [Cr], [Mo], [V] and [N] refer to respectively Si, Ni, The weight percent content of Cr, Mo, V and N.
8. method according to claim 6, the carbon potential (CP) in wherein said carburizing is About 0.85-1.1.
9. method according to claim 6, wherein said Steel material also includes：About The carbon (C) of 0.15-0.25wt%, the manganese (Mn) of about 0.3-1.0wt%, about 0.03wt% Or lower but more than the phosphorus (P) of 0wt%, about 0.03wt% or lower but the sulfur more than 0wt% (S), about 0.3wt% or lower but more than the copper (Cu) of 0wt%, about 0.01-0.05wt% Niobium (Nb) and about 0.01-0.05wt% aluminum (Al), all wt% are based on described steel The gross weight of material.
10. method according to claim 6, it also includes：
After described carburizing, nitriding is carried out to described Steel material.
11. methods according to claim 10, wherein said nitriding is containing about 0.5-2 Ammonia (the NH of vol%3) atmosphere under carry out under about 820-870 DEG C of temperature range.
12. methods according to claim 11, wherein pass through forging, normalizing, annealing and Described Steel material is manufactured into predetermined actuating device shape by any one or more in processing.
A kind of 13. vehicle parts, it includes carburizing steel compositions according to claim 1.
14. vehicle parts according to claim 13, it is actuating device.
A kind of 15. vehicles, it includes vehicle part according to claim 13.
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