CN101948986A - High-quality alloy steel bar and production process thereof - Google Patents
High-quality alloy steel bar and production process thereof Download PDFInfo
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Abstract
The invention belongs to the field of alloys, in particular to a high-quality alloy steel bar and a production process thereof. The high-quality alloy steel bar comprises the following components in percentage by weight: 0.10 to 0.50 percent of C, 0.10 to 1.50 percent of Cr, 0.50 to 1.50 percent of Mn, 0.010 to 0.015 percent of Ti, less than or equal to 0.40 percent of Si, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.020 to 0.050 percent of Al, less than or equal to 0.020 percent of N, less than or equal to 0.03 percent of Mo, 0.05 to 0.50 percent of V, less than 0.030 percent of Ni, less than or equal to 0.090 percent of Cu, less than or equal to 0.0018 percent of B, less than or equal to 0.0014 percent of O and the balance of Fe and inevitable impurities. In the process, a crystallizer electromagnetic stirring mode is adopted, the current intensity of crystallizer electromagnetic stirring equipment is 0 to 550A, the frequency of the crystallizer electromagnetic stirring equipment is 2 to 4Hz, the solidified end section is slightly rolled and the rolling reduction is 3 to 9 millimeters. In the invention, the internal quality of casting blanks can be improved obviously, and the central looseness and composition segregation of the cast blanks can be reduced.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of high-quality knot Steel Bar During and production technique thereof of closing.
Background technology
The center porosity and the component segregation that when cast, very easily occur strand when generally producing alloy steel bar, center porosity reaches more than 2 grades when serious, more than 3 grades of requirement are above standard even, because of adopting induction stirring banded segregation to occur, casting blank section carbon content difference reaches 20% of smelting component.The performance of inspection by sampling chemical ingredients is big and be prone to defective for component difference on the cross section on the finished product after rolling.Same position coplanar difference big (more position difference being arranged) not during inspection by sampling hardening capacity greater than 4HRC.Each zone C content of 16CrMnBH of test sees Table 1,
Table 1
| The zone | The chilling layer region | The white band zone | Frame type segregation zone | The center porosity zone | Final set zone, center |
| C content % | 0.154～0.163 | 0.135～0.146 | 0.161～0.164 | 0.169～0.178 | 0.176～0.192 |
The center porosity zone differs 27% of up smelting component with the C content in white band zone.
Summary of the invention
Technical problem to be solved by this invention is: at the shortcoming that above prior art exists, propose a kind of high-quality knot Steel Bar During and casting process thereof of closing, can reduce the center porosity and the component segregation of strand, and then improve the low multiple quality of bar and stablize hardening capacity.
The technical scheme that the present invention solves above technical problem is:
The high-quality knot Steel Bar During of closing comprises following component: C:0.10%～0.50%, Cr:0.10%～1.50% by weight percentage, Mn:0.50%～1.50%, Ti:0.010%～0.015%, Si :≤0.40%, P :≤0.035%, S :≤0.035%, Al:0.020%～0.050%, N :≤0.020%, Mo :≤0.03%, V:0.05～0.50%, Ni≤0.030%, Cu≤0.090%, B≤0.0018%, O≤0.0014%, Fe and unavoidable impurities: surplus.
This class steel grade principal element is C, Mn, Cr, B; C is the strengthening element of steel, and along with the increase of carbon, the intensity of steel, hardness, hardening capacity improve, and impelling strength obviously descends.Mn to the hardening capacity contribution significantly, and is particularly when the content of Mn surpasses 0.8%, more remarkable to the contribution of hardening capacity, and Mn can also significantly increase the mechanical property of steel simultaneously.Cr is to the influence of hardening capacity, in soft steel a little less than Mn; When medium carbon steel, its effect is better than Mn, and Cr can also significantly improve the plasticity and toughness of steel simultaneously.B is a strong element that improves the hardening capacity aspect, only needs other content of 10ppm level can significantly improve the hardening capacity of material.
High-quality production technique of closing the knot Steel Bar During, comprise electric arc furnace smelting → LF refining → VD vacuum-treat → three machines, three stream alloy steel continuous casting machine continuous casting → slow cooling → heating → rolling → sawing → slow cooling → peeling → flaw detection → check → warehouse-ins, in three machines, the three stream alloy steel continuous casting machine continuous casting working procedures, adopt crystallizer induction stirring mode, crystallizer electromagnetic stirring equipment strength of current 0～550A, frequency 2～4HZ solidifies the latter end employing and gently depresses draught 3～9mm.
Owing to adopt crystallizer induction stirring mode strength of current 0～550A in three machines, the three stream alloy steel continuous casting machine continuous casting working procedures, frequency 2～4HZ solidifies the latter end employing and gently depresses draught 3～9mm, the strand inner quality be can significantly improve, strand center porosity and component segregation alleviated.Can force molten steel to rotate by induction stirring technology, thereby consolidated structure is improved in the temperature field in the homogeneously crystallized device with certain speed; By continuous casting and solidifying not the phase exert pressure, slab thickness is reduced, eliminate the sealed area, center of putting up a bridge and forming because of solidifying, improve strand density, minimizing center porosity, elimination central pipe, segregation etc.
Adopt the bars such as 18CrMnBH, 42CrMoA of explained hereafter of the present invention, low power center porosity is equally all below 1.5 grades, and General Loosen is below 1.0 grades, and strand carbon segregation index is controlled in 1.05.Hardening capacity is with the different surface hardness differences of check same position entirely in 4HRC.Flaw detection qualification rate is more than 99%.
Embodiment
Embodiment one
Present embodiment be the high-quality knot Steel Bar During of closing of a kind of 16CrMnBH, comprise following component: C:0.157% by weight percentage, Cr:0.98%, Mn:1.17%, Ti:0.012%, Si:0.26%, P:0.01%, S:0.017%, Al:0.030%, N:0.0120%, Mo:0.03%, V:0.12%, Ni:0.03%, Cu:0.090%, B:0.0018%, O:0.0014%, Fe and unavoidable impurities: surplus.
The bar that present embodiment is rolling altogether φ 100mm and two specifications of φ 150mm are two batches, operation is specific as follows:
The 100t ultra-high power electric arc furnace is smelted: by the high temperature that electrode discharge produces, and melting waste steel, and slough impurity such as P, S.
The 100tLF refining: deoxidation, adjust constituent contents such as C, Mn, Si, Cr as requested, by the quiet inclusion of removing in the molten steel that stirs.
80tVD vacuum-treat: in the following vacuum tightness of 1Mba, take off air inclusions such as O, N, H.
Three machines, three stream alloy steel continuous casting machine continuous castings: adopt crystallizer induction stirring mode, crystallizer electromagnetic stirring equipment strength of current 300A, frequency 2HZ, solidifying the latter end employing gently depresses, draught 3mm, crystallizer electromagnetic stirring equipment manufacturer is ABB (ABB) company, and model is ORMD-900;
Slow cooling: steel billet is being collected more than 500 ℃, gone out the hole below putting into burial pit slow cooling to 200 ℃, alleviating the steel billet structural stress, eliminating the inside and outside defective of steel billet.
Heating: steel billet is heated to more than 1100 ℃, carries out complete austenitizing, make steel billet have good plasticity, be easy to rolling processing.
Rolling: as to use milling train, steel billet by a series of difform pass processing, is finally become the size and dimension of requirement.
Sawing: the length with rolling good long finished steel sawing becomes to require is easy to transportation and user and uses.
Slow cooling: steel are being collected more than 600 ℃, gone out the hole below putting into burial pit slow cooling to 200 ℃, alleviating the steel structural stress, eliminating the inside and outside defective of steel, reducing steel hardness.
Peeling: use the peeler wheel machine, steel surface is ground off certain thickness, remove surperficial minor defects, and prepare for eddy current test.
Flaw detection: by ultrasonic wave and eddy current examination steel inside and surface imperfection, the problem steel of avoiding flow in user's hand.
Check: check surface, size, the sign of steel, the physicochemical property of sampling observation steel etc.
Warehouse-in: the finished product through being up to the standards is packed, is weighed, and puts into the warehouse.
After testing, each zone C content situation sees the following form:
Table 2
| The zone | The chilling layer region | The white band zone | Frame type segregation zone | The center porosity zone | Final set zone, center |
| C content % | 0.168～0.173 | 0.162～0.170 | 0.152～0.157 | 0.164～0.172 | 0.175～0.190 |
Except material property is influenced little final set zone, center, other zone C content differs maximum only 0.021%, has only 13% of smelting component, has descended half.
Its hardening capacity detected result is also fine, sees the following form:
Table 3
The low power center porosity of product is all below 1.5 grades, and General Loosen is below 1.0 grades.
Embodiment two
Present embodiment be the high-quality knot Steel Bar During of closing of a kind of 15B36Cr, comprise following component: C:0.331% by weight percentage, Cr:0.31%, Mn:1.26%, Ti:0.013%, Si:0.28%, P:0.009%, S:0.004%, Al:0.030%, N:0.0120%, Mo:0.02%, V:0.3%, Ni:0.02%, Cu:0.050%, B:0.001%, O:0.001%, Fe and unavoidable impurities: surplus.
The bar that φ 120mm specification that present embodiment is altogether rolling is one batch, operation is specific as follows:
The 100t ultra-high power electric arc furnace is smelted: by the high temperature that electrode discharge produces, and melting waste steel, and slough impurity such as P, S.
The 100tLF refining: deoxidation, adjust constituent contents such as C, Mn, Si, Cr as requested, by the quiet inclusion of removing in the molten steel that stirs.
80tVD vacuum-treat: in the following vacuum tightness of 1Mba, take off air inclusions such as O, N, H.
Three machines, three stream alloy steel continuous casting machine continuous castings: adopt crystallizer induction stirring mode, crystallizer electromagnetic stirring equipment strength of current 200A, frequency 4HZ, solidifying the latter end employing gently depresses, draught 6mm, crystallizer electromagnetic stirring equipment manufacturer is ABB (ABB) company, and model is ORMD-900;
Slow cooling: steel billet is being collected more than 500 ℃, gone out the hole below putting into burial pit slow cooling to 200 ℃, alleviating the steel billet structural stress, eliminating the inside and outside defective of steel billet.
Heating: steel billet is heated to more than 1100 ℃, carries out complete austenitizing, make steel billet have good plasticity, be easy to rolling processing.
Rolling: as to use milling train, steel billet by a series of difform pass processing, is finally become the size and dimension of requirement.
Sawing: the length with rolling good long finished steel sawing becomes to require is easy to transportation and user and uses.
Slow cooling: steel are being collected more than 600 ℃, gone out the hole below putting into burial pit slow cooling to 200 ℃, alleviating the steel structural stress, eliminating the inside and outside defective of steel, reducing steel hardness.
Peeling: use the peeler wheel machine, steel surface is ground off certain thickness, remove surperficial minor defects, and prepare for eddy current test.
Flaw detection: by ultrasonic wave and eddy current examination steel inside and surface imperfection, the problem steel of avoiding flow in user's hand.
Check: check surface, size, the sign of steel, the physicochemical property of sampling observation steel etc.
Warehouse-in: the finished product through being up to the standards is packed, is weighed, and puts into the warehouse.
After testing, each zone C content situation sees the following form:
Table 4
| The zone | The chilling layer region | The white band zone | Frame type segregation zone | The center porosity zone | Final set zone, center |
| C content % | 0.328～0.330 | 0.322～0.337 | 0.322～0.334 | 0.323～0.349 | 0.299～0.329 |
Except material property is influenced little final set zone, center, other zone C content differs maximum only 0.027%, has only 8% of smelting component.
Its hardening capacity detected result is also fine, sees the following form:
Table 5
| Distance (mm) | Specification (mm) | J13 |
| On/following hardening capacity (HRC) | 120 | 44.0/46.0 |
The low power center porosity of product is all below 1.5 grades, and General Loosen is below 1.0 grades.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (5)
1. the high-quality knot Steel Bar During of closing, it is characterized in that: comprise following component: C:0.10%～0.50% by weight percentage, Cr:0.10%～1.50%, Mn:0.50%～1.50%, Ti:0.010%～0.015%, Si :≤0.40%, P :≤0.035%, S :≤0.035%, Al:0.020%～0.050%, N :≤0.020%, Mo :≤0.03%, V:0.05～0.50%, Ni≤0.030%, Cu≤0.090%, B≤0.0018%, O≤0.0014%, Fe and unavoidable impurities: surplus.
2. the high-quality knot Steel Bar During of closing as claimed in claim 1 is characterized in that: comprise following component: C:0.157% by weight percentage, Cr:0.98%, Mn:1.17%, Ti:0.012%, Si:0.26%, P:0.01%, S:0.017%, Al:0.030%, N:0.0120%, Mo:0.03%, V:0.12%, Ni:0.03%, Cu:0.090%, B:0.0018%, O:0.0014%, Fe and unavoidable impurities: surplus.
3. the high-quality knot Steel Bar During of closing as claimed in claim 1 is characterized in that: comprise following component: C:0.331% by weight percentage, Cr:0.31%, Mn:1.26%, Ti:0.013%, Si:0.28%, P:0.009%, S:0.004%, Al:0.030%, N:0.0120%, Mo:0.02%, V:0.3%, Ni:0.02%, Cu:0.050%, B:0.001%, O:0.001%, Fe and unavoidable impurities: surplus.
4. high-quality production technique of closing the knot Steel Bar During as claimed in claim 1, comprise electric arc furnace smelting → LF refining → VD vacuum-treat → three machines, three stream alloy steel continuous casting machine continuous casting → slow cooling → heating → rolling → sawing → slow cooling → peeling → flaw detection → check → warehouse-ins, it is characterized in that: in described three machines, the three stream alloy steel continuous casting machine continuous casting working procedures, adopt crystallizer induction stirring mode, crystallizer electromagnetic stirring equipment strength of current 0～550A, frequency 2～4HZ, solidify the latter end employing and gently depress draught 3～9mm.
5. high-quality production technique of closing the knot Steel Bar During as claimed in claim 4, it is characterized in that: the model that described crystallizer electromagnetic stirring equipment is an ABB is the crystallizer electromagnetic stirring equipment of ORMD-900.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672130A (en) * | 2012-05-30 | 2012-09-19 | 东北大学 | Method for reducing Cr and Mo steel mill bar frame-shaped segregation |
| CN102978532A (en) * | 2012-12-04 | 2013-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel for axle of railway and manufacture method thereof |
| CN102994895A (en) * | 2012-12-03 | 2013-03-27 | 中天钢铁集团有限公司 | Microalloyed high-strength high-toughness steel for geological drilling and production technology thereof |
| CN104372951A (en) * | 2014-11-08 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint |
| CN105648307A (en) * | 2016-01-20 | 2016-06-08 | 广西丛欣实业有限公司 | High-strength reinforcement |
| CN107828952A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Ti, Cr microalloy |
| CN108486472A (en) * | 2018-05-11 | 2018-09-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Ti, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672130A (en) * | 2012-05-30 | 2012-09-19 | 东北大学 | Method for reducing Cr and Mo steel mill bar frame-shaped segregation |
| CN102672130B (en) * | 2012-05-30 | 2013-10-16 | 东北大学 | Method for reducing Cr and Mo steel mill bar frame-shaped segregation |
| CN102994895A (en) * | 2012-12-03 | 2013-03-27 | 中天钢铁集团有限公司 | Microalloyed high-strength high-toughness steel for geological drilling and production technology thereof |
| CN102978532A (en) * | 2012-12-04 | 2013-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel for axle of railway and manufacture method thereof |
| CN104372951A (en) * | 2014-11-08 | 2015-02-25 | 江苏天舜金属材料集团有限公司 | Processing method for chrome molybdenum low alloy prestressed steel reinforcement connection joint |
| CN105648307A (en) * | 2016-01-20 | 2016-06-08 | 广西丛欣实业有限公司 | High-strength reinforcement |
| CN107828952A (en) * | 2017-11-30 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing V, Ti, Cr microalloy |
| CN108486472A (en) * | 2018-05-11 | 2018-09-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Ti, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
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| CN101948986B (en) | 2012-07-25 |
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