CN110079732A - Super harden ability steel and preparation method thereof - Google Patents
Super harden ability steel and preparation method thereof Download PDFInfo
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- CN110079732A CN110079732A CN201910400935.1A CN201910400935A CN110079732A CN 110079732 A CN110079732 A CN 110079732A CN 201910400935 A CN201910400935 A CN 201910400935A CN 110079732 A CN110079732 A CN 110079732A
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The present invention provides a kind of super harden ability steel, this is a kind of middle, high-carbon, in which: V:0.15~0.25wt%, N≤0.008wt%, also, total amount >=4N of Al.The steel electric furnace smelting, cast, forging or roll forming；Austenitizing processing is carried out to steel, austenitizing temperature is+60~100 DEG C of Ac3 (Acm), is then quenched.The steel of preparation has superelevation harden ability, wherein the harden ability impact factor of V makes the whole harden ability of steel improve 50% or more compared with improving 5 times or more under normal condition.
Description
Technical field
The invention belongs to Steel material technical field, it is related to a kind of super harden ability steel and preparation method thereof.
Technical background
Harden ability is an important factor for influencing steel mechanics performance, and excellent harden ability can guarantee steel part in whole cross section
Uniform mechanical property is obtained, this is even more important for large scale components.In order to improve the harden ability of steel material, material
Material scientific worker has carried out a large amount of research work, and summing up can be mentioned by Overheating Treatment and Alloying Treatment two ways
The harden ability of high steel material.Although equally easily causing crystal grain however, the harden ability of steel can be improved in Overheating Treatment
Abnormal coarse, this is unfavorable for the comprehensive mechanical property of material.Alloying Treatment mode is added often through in steel
A large amount of alloying element will cause increasing substantially for production cost to achieve the purpose that improve harden ability again.Therefore, exist
Under the premise of guaranteeing that low cost does not deteriorate steel material comprehensive mechanical property again simultaneously, studies a kind of novel and have universal
The technology of applicability has important engineering significance and scientific value to improve steel material harden ability.
Summary of the invention
In view of the deficiencies of the prior art, it the purpose of the present invention is to provide a kind of super harden ability steel and preparation method thereof, mentions
The technology for having supplied a kind of simple and easy raising middle, high-carbon iron material harden ability, adds V, Al and N element by limiting in steel
Content and higher austenitizing temperature, guarantee solid solution content of the V in steel and promote V in the segregation of crystal boundary, V is made to quench steel
The contribution of permeability greatly improves, and at the same time, can also generate a small amount of VC at such a temperature and hinder grain coarsening.
In order to solve the above technical problems, the invention provides the following technical scheme:
A kind of super harden ability steel comprising the component of following mass ratio: C:0.45~0.95wt%, V:0.15~
0.25wt%, N≤0.008wt%, and the total amount of Al is more than or equal to 4 times of N content, remaining is Fe and inevitably miscellaneous
Matter.
A kind of preparation method of above-mentioned super harden ability steel, specifically includes the following steps:
S1, it is made steel using said components using electric furnace, then steel is by casting, forging or roll forming；
S2, austenite processing being carried out to steel, austenitizing temperature is Ac3+60~100 DEG C or Acm+60~100 DEG C of steel,
Then steel is quenched, obtains super harden ability steel.
Preferably, the hardening media is water or oil.
The present invention also provides a kind of super harden ability steel comprising the component of following mass ratio: C:0.48wt%, Mn:
0.85wt%, Cr:0.63wt%, Si:0.34wt%, V:0.15wt%, Al:0.08wt%, N:0.004wt%, surplus Fe.
The present invention also provides another super harden ability steel comprising the component of following mass ratio: C:0.89wt%, Ni:
0.95wt%, Cr:0.78wt%, Si:0.20wt%, V:0.24wt%, Al:0.21wt%, N:0.006wt%, surplus Fe.
Compared with prior art, the invention has the following advantages:
1, the present invention adds content and the higher austenitizing temperature of V, Al and N element by limiting in steel, guarantees that V exists
Solid solution content in steel simultaneously promotes V in the segregation of crystal boundary, greatly improves V to the contribution of steel hardenability, at the same time, in the temperature
A small amount of VC can also be generated under degree hinders grain coarsening.
2, Al needs enough Al also to fix the N in steel, N is avoided to react with V other than playing deoxidation to molten steel
VN is generated, therefore guarantees total amount >=4N of Al.
3, under the premise of guaranteeing not significantly roughening original austenite grains, at the austenite of steel progress higher temperature
Reason, austenitizing temperature are chosen for Ac3+60~100 DEG C of steel, are then quenched to steel, and obtained steel has high
Harden ability, harden ability impact factor of the V in steel improves 5 times or more, and the harden ability of steel improves 50% or more.
4, appropriate austenitizing temperature is selected, the solid solution of V and the precipitation of VC are controlled, is dissolved content hair enough in guarantee V
Under conditions of waving harden ability, a small amount of VC is generated, hinders Austenite Grain Growth.
5, super harden ability method according to the present invention is suitable for C content in the medium and high carbon steel of 0.45~0.95wt%, fits
It is wide with range.
Detailed description of the invention
Fig. 1 is the Jominy end-quench curves of No. 1 steel and No. 2 steel in embodiment 1.
Specific embodiment
Exemplary embodiment of the present invention, feature and aspect described further below.
The present invention provides a kind of super harden ability steel comprising the component of following mass ratio: C:0.45~0.95wt%, V:
0.15~0.25wt%, N≤0.008wt%, and the total amount of Al is more than or equal to 4 times of N content, and remaining is for Fe and unavoidably
Impurity；Al needs enough Al also to fix the N in steel, therefore guarantees the total amount of Al other than playing deoxidation to molten steel
≥4N。
The present invention also provides a kind of preparation methods of super harden ability steel, specifically includes the following steps:
S1, it is made steel using said components using electric furnace, then steel is by casting, forging or roll forming；
S2, to steel carry out austenite processing, austenitizing temperature be steel+60~100 DEG C of Ac3 (Acm), then to steel into
Row quenching treatment, obtains super harden ability steel.Hardening media is water or oil, or other hardening medias, using this field skill
Hardening media known to art personnel.
Embodiment 1:
It is made steel using vacuum electric furnace, the pure steel ingot of two kinds of heterogeneities, the chemistry of steel is cast under vacuum environment
Ingredient (wt.%) is respectively No. 1 steel: C:0.48, Mn:0.85, Cr:0.63, Si:0.34, V:0.15, Al:0.08, N:
0.004, surplus Fe, No. 2 steel: C:0.47, Mn:0.87, Cr:0.65, Si:0.34, Al:0.17, N:0.003, surplus Fe.
Two kinds of steel are carried out with the conventional conducting forging processing of the same terms.It carries out austenitizing 1 hour in 870 DEG C of air furnace, surveys later
Try the harden ability and crystallite dimension of two kinds of steel.The average grain size of No. 1 steel is 15.6 μm, and the average grain size of No. 2 steel is
18.4 μm, ideal critical diameter of No. 1 steel under the conditions of water quenching is 1.6 times of No. 2 steel, as shown in Figure 1, identical away from hardening
When holding length, the hardness of No. 1 steel is significantly stronger than No. 2 steel, it was demonstrated that the harden ability of No. 1 steel is higher.Illustrate it is identical in other components and
Under identical austenitizing temperature, V greatly improves the contribution of steel hardenability, also turns out simultaneously, in Ovshinsky provided by the invention
At a temperature of body, the solid solution of V and the precipitation of VC are controlled, under conditions of guaranteeing that V is dissolved content performance harden ability enough, is generated
A small amount of VC hinders Austenite Grain Growth, so that the effect of V has been performed to maximum, the contribution to harden ability is that the prior art cannot
Reach, therefore the harden ability of steel prepared of the present invention is substantially better than the steel of the prior art, prepared by the present invention is super harden ability
Steel.
Embodiment 2:
It is made steel using vacuum electric furnace, the pure steel ingot of two kinds of heterogeneities, the chemistry of steel is cast under vacuum environment
Ingredient (wt.%) is respectively No. 1 steel: C:0.68, Mn:0.30, Cr:1.23, Ni:0.65, Si:0.05, V:0.21, Al:
0.16, N:0.002, surplus Fe, No. 2 steel: C:0.70, Mn:0.32, Cr:1.20, Ni:0.68, Si:0.06, Al:0.15, N:
0.003, surplus Fe.Two kinds of steel are carried out with the hot rolling treatment of the same terms.Austenitizing 1 is carried out in 890 DEG C of air furnace
Hour, the harden ability and crystallite dimension of two kinds of steel are tested later.The average grain size of No. 1 steel is 15.3 μm, and No. 2 steel are averaged
Crystallite dimension is 19.8 μm, and ideal critical diameter of No. 1 steel under the conditions of oil quenching is 1.8 times of No. 2 steel, the harden ability of No. 1 steel
It is higher.
Embodiment 3:
It is made steel using vacuum electric furnace, the pure steel ingot of two kinds of heterogeneities, the chemistry of steel is cast under vacuum environment
Ingredient (wt.%) is respectively No. 1 steel: C:0.89, Ni:0.95, Cr:0.78, Si:0.20, V:0.24, Al:0.21, N:
0.006, surplus Fe, No. 2 steel: C:0.92, Ni:1.02, Cr:0.78, Si:0.24, Al:0.15, N:0.007, surplus Fe.
Two kinds of steel are carried out with the conventional conducting forging processing of the same terms.It carries out austenitizing 1 hour in 900 DEG C of air furnace, surveys later
Try the harden ability and crystallite dimension of two kinds of steel.The average grain size of No. 1 steel is 18.1 μm, and the average grain size of No. 2 steel is
22.3 μm, ideal critical diameter of No. 1 steel under the conditions of water quenching is 1.5 times of No. 2 steel, and the harden ability of No. 1 steel is higher.
Embodiment 4
It is made steel using vacuum electric furnace, the pure steel ingot of two kinds of heterogeneities, the chemistry of steel is cast under vacuum environment
Ingredient (wt.%) is respectively No. 1 steel: C:0.48, Mn:0.01, Cr:0.90, Si:2.00, Mo:0.15, V:0.15, Al:
0.10, N:0.005, surplus Fe, No. 2 steel: C:0.49, Mn:0.02, Cr:0.89, Si:2.05, Mo:0.13, V:0.15, Al:
0.01, N:0.039, surplus Fe.Two kinds of steel are carried out with the conventional conducting forging processing of the same terms.In 880 DEG C of air furnace into
Row austenitizing 1 hour, the harden ability and crystallite dimension of two kinds of steel were tested later.The average grain size of No. 1 steel is 16.5 μm,
The average grain size of No. 2 steel is 17.2 μm, and the two does not have a significant difference, but ideal critical of No. 1 steel under the conditions of water quenching
Diameter is 1.65 times of No. 2 steel, and the harden ability of No. 1 steel is higher.From ingredient, the difference of No. 1 steel and No. 2 steel is: No. 1 steel
In, Al content is much larger than N content, i.e., the total amount of the Al of the invention limited is more than or equal to 4 times of N, and in No. 2 steel, Al content is small
In N content, in the identical situation of other components, for the Al in No. 1 steel other than playing deoxidation to molten steel, extra Al is solid
Determine the N in steel, has avoided N from reacting with V and generate VN, thus guarantee solid solution content of the V in steel and promote V in the segregation of crystal boundary,
Greatly improve V to the contribution of steel hardenability.
To sum up, the present invention adds content and the higher austenitizing temperature of V, Al and N element by limiting in steel, so that
Harden ability impact factor of the V in steel improves 5 times or more, and the harden ability of steel improves 50% or more, and super harden ability steel is made, this
Steel of the invention for C content in 0.45~0.95wt% is applicable in.
Finally, it should be noted that above embodiments are only to illustrate the present invention and not limit technology described in the invention
Scheme；Therefore, although this specification is referring to the above embodiments, the present invention has been described in detail, this field
It is to be appreciated by one skilled in the art that still can modify to the present invention or equivalent replacement；And all do not depart from the present invention
Spirit and scope technical solution and its improvement, should all cover within the scope of the claims of the present invention.
Claims (5)
1. a kind of super harden ability steel, it is characterised in that: it includes the component of following mass ratio: C:0.45~0.95wt%, V:
0.15~0.25wt%, N≤0.008wt%, and the total amount of Al is more than or equal to 4 times of N content, and remaining is for Fe and unavoidably
Impurity.
2. a kind of preparation method of super harden ability steel as described in claim 1, it is characterised in that: it specifically includes following step
It is rapid:
S1, it is made steel using said components using electric furnace, then steel is by casting, forging or roll forming；
S2, austenite processing is carried out to steel, austenitizing temperature is Ac3+60~100 DEG C or Acm+60~100 DEG C of steel, then
Steel is quenched, super harden ability steel is obtained.
3. the preparation method of super harden ability steel according to claim 2, it is characterised in that: the hardening media be water or
Oil.
4. a kind of super harden ability steel, it is characterised in that: it includes the component of following mass ratio: C:0.48wt%, Mn:
0.85wt%, Cr:0.63wt%, Si:0.34wt%, V:0.15wt%, Al:0.08wt%, N:0.004wt%, surplus Fe.
5. a kind of super harden ability steel, it is characterised in that: it includes the component of following mass ratio: C:0.89wt%, Ni:
0.95wt%, Cr:0.78wt%, Si:0.20wt%, V:0.24wt%, Al:0.21wt%, N:0.006wt%, surplus Fe.
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| CN201910400935.1A CN110079732B (en) | 2019-05-15 | 2019-05-15 | Preparation method of super-hardenability steel |
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| CN110079732B CN110079732B (en) | 2020-08-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1025752A1 (en) * | 1981-12-23 | 1983-06-30 | Центральный научно-исследовательский институт материалов и технологии тяжелого и транспортного машиностроения | Steel |
| US4537644A (en) * | 1981-09-28 | 1985-08-27 | Nippon Steel Corporation | High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same |
| CN102741440A (en) * | 2010-05-31 | 2012-10-17 | 新日本制铁株式会社 | Steel material for quenching and method of producing same |
| CN104726783A (en) * | 2015-02-09 | 2015-06-24 | 燕山大学 | Steel for wind power yaw and variable pitch bearing sleeve ring and preparation method thereof |
| CN107354380A (en) * | 2017-08-30 | 2017-11-17 | 武汉钢铁有限公司 | A kind of tensile strength >=2300MPa bridge cables steel and production method |
| CN107988565A (en) * | 2017-11-28 | 2018-05-04 | 钢铁研究总院 | A kind of high toughness high hardenability high speed axle steel and its heat treatment method |
-
2019
- 2019-05-15 CN CN201910400935.1A patent/CN110079732B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4537644A (en) * | 1981-09-28 | 1985-08-27 | Nippon Steel Corporation | High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same |
| SU1025752A1 (en) * | 1981-12-23 | 1983-06-30 | Центральный научно-исследовательский институт материалов и технологии тяжелого и транспортного машиностроения | Steel |
| CN102741440A (en) * | 2010-05-31 | 2012-10-17 | 新日本制铁株式会社 | Steel material for quenching and method of producing same |
| CN104726783A (en) * | 2015-02-09 | 2015-06-24 | 燕山大学 | Steel for wind power yaw and variable pitch bearing sleeve ring and preparation method thereof |
| CN107354380A (en) * | 2017-08-30 | 2017-11-17 | 武汉钢铁有限公司 | A kind of tensile strength >=2300MPa bridge cables steel and production method |
| CN107988565A (en) * | 2017-11-28 | 2018-05-04 | 钢铁研究总院 | A kind of high toughness high hardenability high speed axle steel and its heat treatment method |
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