CN110218941A - A kind of process and structural alloy steel reducing alloy structure steel hardenability - Google Patents
A kind of process and structural alloy steel reducing alloy structure steel hardenability Download PDFInfo
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- CN110218941A CN110218941A CN201910559266.2A CN201910559266A CN110218941A CN 110218941 A CN110218941 A CN 110218941A CN 201910559266 A CN201910559266 A CN 201910559266A CN 110218941 A CN110218941 A CN 110218941A
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- steel
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- boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to steel alloy material processing technique fields, and in particular to a kind of process and structural alloy steel for reducing alloy structure steel hardenability.The present invention passes through boron mass percentage B≤0.0002% in control structural alloy steel, increase N content, control Ti:0.010-0.020%, N:0.0060-0.0090%, and ω Ti/ ω N is controlled less than 3.42, in RH vacuum refining process, pass through nitrogen flushing technique, extra N easily forms BN in conjunction with B, invalid boron is converted by effective boron in steel, reducing B influences the harden ability of material, reduces the harden ability of J15 point, the comprehensive performance of steel is improved, so that the steel alloy of preparation meets the performance requirement of thrust wheel body structural alloy steel plasticity and toughness.
Description
Technical field
The present invention relates to steel alloy material processing technique fields, and in particular to a kind of work for reducing alloy structure steel hardenability
Process and structural alloy steel.
Background technique
Structural alloy steel is since with suitable harden ability, after suitable metal heat treatmet, microscopic structure is uniform
Sorbite, bainite or superfine pearlite, thus tensile strength with higher and yield tensile ratio, higher toughness and fatigue are strong
Degree and lower Ductile-brittle transition temperature, can be used for manufacturing the biggish machine parts of sectional dimension.
Such as thrust wheel be tracked construction equipment chassis four-wheel one with one of, its main function is to support digging
The weight of pick machine and bull-dozer, allows crawler belt to advance along wheel.By correlations such as wheel body, supporting wheel shaft, axle sleeve, sealing ring, end caps
Component is constituted.Thrust wheel wheel body orbital plane bears frequent shock loading, is easy to appear extrusion deformation, extends wheel body orbital plane
It is conical, therefore in order to improve the wearability of thrust wheel wheel body, selecting wheel body material is mostly 40Mn2 structural alloy steel, main
Composition characteristics are wanted to design are as follows: C:0.37%-0.44%, Si:0.17-0.37%, Mn:1.40%-1.80%, P≤0.030%, S
≤ 0.030%, Cr:0.08-0.18%, Ti:0.010-0.020%, remaining is Fe and inevitable impurity.In order to improve material
The surface abrasion resistance of material mentions high Mn content, and increases Cr content, but Mn and Cr are to improve harden ability element, are caused in material
Portion's harden ability is excessively high, reduces inner micro plastic, toughness.Since Mn content is high, increases steel billet in the operation of rolling and heating
When crackle heat sensitivity, increase steel surface crackle odds, Ti be added in production process and refines crystal grain, prevents surface
The generation of crackle.
Thrust wheel wheel body is formed using forging method, carries out modifier treatment to wheel body blank after molding, and hardness reaches 26~
32HRC, to keep intensity, plasticity, toughness and comprehensive mechanical performance with higher inside wheel body.Body surfaces carry out at quenching
Reason, to improve hardness, the wearability of thrust wheel orbital plane, quenching hardness is 50~58HRC, and depth of hardening zone is 6~12mm, this
Sample track surface hardness and Chain Link hardness (48~58HRC) substantially close to.
Steel manufacturer is distributed with end hardenability to measure the quenched hardness of steel.End hardenability is from one end
It is cooled down, one end is equivalent to water cooling, and the other end is equivalent to air-cooled, and since the specification size of material is identical, the state of cooling is identical.
Its end quenching corresponding data are that such material is reflected in hardness under different cooling.
Requirement of the user to 40Mn2 material end harden ability J15 point is≤40HRC, and produces detection process in 40Mn2
In, the hardness number of end hardenability J15 point reaches 45-50HRC, can not meet plasticity, the performance of toughness inside thrust wheel wheel body
It is required that.
Summary of the invention
In order to overcome the drawbacks of the prior art, the purpose of the present invention is to provide a kind of reduction alloy structure steel hardenabilities
Process.
Meanwhile the object of the invention is also to provide a kind of structural alloy steels, have low harden ability, meet thrust wheel body
With the performance requirement of structural alloy steel plasticity and toughness.
A kind of process reducing alloy structure steel hardenability, controls B mass percentage≤0.0002%, Ti mass
Percentage composition and N mass percentage ratio are less than 3.42.
Raw materials for production and ladle are required in structural alloy steel production process of the present invention as follows:
(1) cord steel scrap or carbon steel scrap are used, steel scrap containing B is forbidden to use.
(2) ladle that steel containing B uses must have enough to meet the need can use more than twice.
(3) use alloy are as follows: low boron manganese metal or low boron low-carbon ferromanganese (B≤25ppm), low boron medium carbon ferrochrome (B≤
20ppm), low boron-silicon-Fe (B≤75ppm) etc. is low boron alloyed.
Further, control N mass percentage is 0.0060-0.0090%.
Further, control Ti mass percentage is 0.010-0.020%.
Further, including the RH nitrogen flushing technique using low cost, high-cleanness.
Further, RH vacuum degree≤66.7Pa, circulation 1200-1500NL/min, using nitrogen circulation, vacuum is kept
Time is 10~15min.
Further, the sampling spectral analysis N content before RH enters the station calculates and needs increased nitrogen amount, determines that vacuum is protected
Hold the time.
A kind of structural alloy steel is prepared using above-mentioned process.
It is a kind of reduce alloy structure steel hardenability process, reduce steel in B content, B≤0.0002%,
Further, above-mentioned structural alloy steel, chemical component mass percentage composition are as follows: C:0.37%-0.44%,
Si:0.17-0.37%, Mn:1.40%-1.80%, P≤0.030%, S≤0.030%, Cr:0.08-0.18%, Ti:
0.010-0.020%, N:0.0060-0.0090%, B≤0.0002%, remaining is Fe and inevitable impurity.
During austenite conversion, grain boundaries are the regions of ferrite most probable nucleation, and micro boron is being added
Afterwards, boron can promptly be adsorbed on grain boundaries, thus the recess before having filled up, this reduces the energy positions of crystal boundary, increase new
The mutually difficulty of nucleation, it is final that the stability of austenite is provided.And in the cooling procedure of austenite, it successfully hinders and is first precipitated
Ferritic generation, cause austenite tour to obtain apparent extension, finally improve the harden ability of steel significantly.
The major advantage of boron is that content seldom will significantly change the harden ability of steel in steel, but this is also its master
Disadvantage is wanted, i.e. steel is all very sensitive to the minor change of boron content.Therefore, it needs to carry out stringent control in steel-making.Due to
There is boron stronger chemical activity therefore often there is the boron of diversified forms in steel.And to steel existing for be dissolved in the form of state
The contributive boron of harden ability is effective boron mentioned here.Corresponding, boron existing for other non-solid solution state forms is to through hardening
Property is not without any contribution, referred to as invalid boron.
The present invention increases N content, controls Ti by boron mass percentage B≤0.0002% in control structural alloy steel:
0.010-0.020%, N:0.0060-0.0090%, and ω Ti/ ω N is controlled less than in 3.42, RH vacuum refining process, pass through
Nitrogen flushing technique, extra N easily form BN in conjunction with B, convert invalid boron for effective boron in steel, reduce through hardening of the B to material
Property influence, reduce J15 point harden ability, improve the comprehensive performance of steel so that preparation steel alloy meet thrust wheel body close
The performance requirement of golden structural steel plasticity and toughness.
Specific embodiment
In the following, the present invention will be further described in conjunction with specific embodiment, but embodiment the present invention is not done it is any
The restriction of form.Unless stated otherwise, the present invention uses reagent, method and apparatus is the art conventional reagents, method
And equipment.Unless stated otherwise, following embodiment agents useful for same and material are commercially available.
The steel billet section that continuous casting is formed in Steel material process in following embodiments is 400mm × 500mm.
The following processes as described in the examples of the present invention include that traditional Steel material processes necessary converter smelting, LF
The technical process such as refining, RH application of vacuum, continuous casting.
Raw materials for production and ladle are required in following embodiment medium alloy constructional steel production processes as follows:
(1) cord steel scrap or carbon steel scrap are used, steel scrap containing B is forbidden to use.
(2) ladle that steel containing B uses must have enough to meet the need can use more than twice.
(3) use alloy are as follows: low boron low-carbon ferromanganese (B:13ppm), low boron medium carbon ferrochrome (B:5ppm), low boron-silicon-Fe (B:
It is 53ppm) etc. low boron alloyed.
The present invention will be further described with reference to the following examples.
Embodiment 1
The chemical component composition of the structural alloy steel of the present embodiment processing are as follows: C:0.38%, Si:0.23%, Mn:
1.51%, P:0.014%, S:0.003%, Cr:0.106%, Ti:0.0176%, N:0.0075%, B:0.00001%, remaining
For Fe and inevitable impurity.
The process of the present embodiment structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1200NL/
Min, using nitrogen circulation, vacuum retention time 13min.
Embodiment 2
The chemical component composition of the conjunction knot steel of the present embodiment processing are as follows: C:0.38%, Si:0.21%, Mn:1.49%, P:
0.014%, S:0.003%, Cr:0.105%, Ti:0.0147%, N:0.0072%, B:0.00001%, remaining is for Fe and not
Evitable impurity.
The process of the present embodiment structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1200NL/
Min, using nitrogen circulation, vacuum retention time 12min.
Embodiment 3
The chemical component composition of the conjunction knot steel of the present embodiment processing are as follows: C:0.44%, Si:0.37%, Mn:1.80%, P:
0.02%, S:0.005%, Cr:0.08%, Ti:0.02%, N:0.009%, B:0.00002%, remaining is for Fe and unavoidably
Impurity.
The process of the present embodiment structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1500NL/
Min, using nitrogen circulation, vacuum retention time 15min.
Embodiment 4
The chemical component composition of the conjunction knot steel of the present embodiment processing are as follows: C:0.37%, Si:0.17%, Mn:1.40%, P:
0.03%, S:0.002%, Cr:0.18%, Ti:0.01%, N:0.006%, B:0.000015%, remaining is Fe and can not keep away
The impurity exempted from.
The process of the present embodiment structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1200NL/
Min, using nitrogen circulation, vacuum retention time 10min.
Comparative example 1
The chemical component composition of the conjunction knot steel of this comparative example processing are as follows: C:0.40%, Si:0.24%, Mn:1.53%, P:
0.016%, S:0.003%, Cr:0.107%, Ti:0.0203%, N:0.0041%, B:0.0001%, remaining is Fe and can not
The impurity avoided.
The process of this comparative example structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1200NL/
Min is recycled using argon gas, vacuum retention time 12min.
Comparative example 2
The chemical component composition of the conjunction knot steel of this comparative example processing are as follows: C:0.38%, Si:0.23%, Mn:1.50%, P:
0.013%, S:0.003%, Cr:0.103%, Ti:0.0170%, N:0.0035%, B:0.0001%, remaining is Fe and can not
The impurity avoided.
The process of this comparative example structural alloy steel, including RH refining: vacuum degree≤66.7Pa, circulation 1200NL/
Min is recycled using argon gas, vacuum retention time 12min.
Comparative example 3
The chemical component composition of the conjunction knot steel of this comparative example processing are as follows: C:0.39%, Si:0.23%, Mn:1.52%, P:
0.016%, S:0.003%, Cr:0.091%, Ti:0.0207%, N:0.0045%, B:0.0004%, remaining is Fe and can not
The impurity avoided.
A kind of process reducing alloy structure steel hardenability, including following operating procedure:
(1) it is not forbidden to use the ladle that steel scrap containing B and steel containing B use, to using alloy not do B content requirement.
(2) RH is refined: vacuum degree≤66.7Pa, circulation 1200NL/min are recycled using argon gas, the vacuum retention time
12min。
Comparative example 4
The chemical component composition of the conjunction knot steel of this comparative example processing are as follows: C:0.39%, Si:0.21%, Mn:1.50%, P:
0.017%, S:0.003%, Cr:0.103%, Ti:0.0170%, N:0.0042%, B:0.0003%, remaining is Fe and can not
The impurity avoided.
A kind of process reducing alloy structure steel hardenability, including following operating procedure:
(1) it is not forbidden to use the ladle that steel scrap containing B and steel containing B use, to using alloy not do B content requirement.
(2) RH is refined: vacuum degree≤66.7Pa, circulation 1200NL/min are recycled using argon gas, the vacuum retention time
12min。
Different embodiment and comparative example end hardenabilities are counted respectively, as a result as shown in table 1 below:
1 technological parameter of table and end quenching qualification rate
The data shown in above-mentioned table 1: control of the present invention by control raw materials for production and ladle to B content, drop
B content in low steel, less than 0.0002%；Further, in RH vacuum refining process, by the change of recyclegas, with
And the control loop time, it improves and accurately controls Ti and N content in steel, further convert invalid boron for effective boron in steel.
The present invention reduces influence of the remaining B to harden ability, overcomes the conjunctions knot such as 40Mn2 by Ti, N and B content in comprehensively control steel
Harden ability height and unstable problem, improve the comprehensive performance of the steel for mechanical structure such as thrust wheel in steel.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (8)
1. a kind of process for reducing alloy structure steel hardenability, which is characterized in that control B mass percentage≤
0.0002%, Ti mass percentage and N mass percentage ratio are less than 3.42.
2. reducing the process of alloy structure steel hardenability as described in claim 1, which is characterized in that control N mass hundred
Dividing content is 0.0060-0.0090%.
3. reducing the process of alloy structure steel hardenability as claimed in claim 2, which is characterized in that control Ti mass hundred
Dividing content is 0.010-0.020%.
4. reducing the process of alloy structure steel hardenability as claimed in claim 3, which is characterized in that including RH nitrogen flushing work
Skill.
5. reducing the process of alloy structure steel hardenability as claimed in claim 4, which is characterized in that RH vacuum degree≤
66.7Pa, circulation 1200-1500NL/min, using nitrogen circulation, the vacuum retention time is 10~15min.
6. reducing the process of alloy structure steel hardenability as claimed in claim 5, which is characterized in that taken before RH enters the station
Sample spectrum analysis N content calculates and needs increased nitrogen amount, determines the vacuum retention time.
7. a kind of structural alloy steel, which is characterized in that using process as described in any one of claims 1 to 6 preparation
At.
8. structural alloy steel as claimed in claim 7, which is characterized in that its chemical component mass percentage composition are as follows: C:
0.37%-0.44%, Si:0.17-0.37%, Mn:1.40%-1.80%, P≤0.030%, S≤0.030%, Cr:0.08-
0.18%, Ti:0.010-0.020%, N:0.0060-0.0090%, B≤0.0002%, remaining for Fe and inevitably it is miscellaneous
Matter.
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Cited By (2)
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| CN111118387A (en) * | 2019-12-13 | 2020-05-08 | 河钢乐亭钢铁有限公司 | Method for improving surface quality of boron-containing steel continuous casting slab |
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