CN100500916C - Boron-containing steel and preparation method thereof - Google Patents
Boron-containing steel and preparation method thereof Download PDFInfo
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- CN100500916C CN100500916C CNB2007101139168A CN200710113916A CN100500916C CN 100500916 C CN100500916 C CN 100500916C CN B2007101139168 A CNB2007101139168 A CN B2007101139168A CN 200710113916 A CN200710113916 A CN 200710113916A CN 100500916 C CN100500916 C CN 100500916C
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Abstract
The present invention relates to one kind of boron steel and its preparation process. The boron steel has the chemical composition of C 0.32-0.44 wt%, Si 0.15-0.37 wt%, Mn 1.10-1.40 wt%, P not more than 0.030 wt%, S not more than 0.030 wt%, B 0.0005-0.0035 wt%, Al 0.015-0.070 wt%, and Fe and small amount of impurity for the rest. Its preparation process includes the steps of electric furnace smelting, refining outside the furnace, continuous casting of billet, semi tandem rolling, and vacuum degassing after refining outside the furnace to reach N2 content not more than 80 ppm and O2 content not more than 15 ppm. The billet rolling has a soaking temperature in the heating furnace of 1130-1200 deg.c, heating and high temperature diffusion time of 4-12 hr, cogging temperature of 1080 deg.c, finish rolling temperature of 850-1000 deg.c, and product of round bar in 30-130 mm diameter. The boron steel has high hardenability, and is suitable for making important mechanical members.
Description
Technical field
The present invention relates to metallurgical technology, belong to the steel alloy class, be specifically related to a kind of boron-containing steel and preparation method thereof.
Background technology
Boron (B) is one of extremely active element, can close the stable inclusion of formation with residual nitrogen, oxidation and lose its useful effect in steel, and only the boron that is present in the steel with the solid solution form just can play useful effect.The B element can improve the hardening capacity and the fatigue resistance of steel, how to control " effectively boron " content in the steel, and hot-work is produced carry out smoothly, smelts that to produce be the key link extremely.This boron-containing steel steel grade chemical ingredients strict (the particularly content of B), mechanical property and structural constituent change responsive characteristics, and technology controlling and process such as smelting, continuous casting are very crucial.
Domestic early stage with electric furnace one mould injection system production boron steel, how Han Lijiao (Shenyang University of Technology), Li Ke (Shenyang Japan system steel company limited) etc. control effective boron content with the electric furnace smelting boron steel and have carried out studying (referring to people's such as Han Lijiao paper " control of B composition in the 60CrMnBA smelting steel " simple, Shenyang University of Technology's journal, the 19th the 6th phase of volume, 1997.12).The production of Shoudu Iron and Steel Co revolving furnace continuous casting systematic testing boron steel has obtained certain success, is illustrated in wide stone Li Benhai paper " rectangular billet caster is produced the experimental study of 40MnB steel ", steel research, 2004.4, the 2 phases.The domestic steel of climbing has carried out the trial-production that the converter die casting system is produced the MnB steel in 1999.
Summary of the invention
The present invention is primarily aimed at the problem of determining and controlling of boron-containing steel effective boron content in smelting process, and a kind of boron-containing steel and preparation method thereof is provided, and boron-containing steel of the present invention has high-hardenability, high-strong toughness, excellent combination property, belongs to structural alloy steel.
The chemical ingredients of boron-containing steel of the present invention (weight percent) is:
C 0.32～0.44 Si 0.15～0.37 Mn 1.10～1.40 P≤0.030 S≤0.030 B, 0.0005～0.0035 Al 0.015～0.070; Surplus is Fe and trace impurity.
Further preferred, the chemical ingredients of boron-containing steel of the present invention (weight percent) is:
C 0.33～0.37 Si 0.15～0.30 Mn 1.10～1.35 P≤0.025 S≤0.025 B, 0.0010～0.0030 Al, 0.015～0.060 V 0.10～0.12; Surplus is Fe and trace impurity.
The preparation method of boron-containing steel of the present invention, comprise that electrosmelting, external refining, continuous-casting of steel billet, semi-tandem rolling are rolling, it is characterized in that the chemical ingredients % of steel (weight percent) is: C 0.33～0.37, Si 0.15～0.30, Mn 1.10～1.35, P≤0.025, S≤0.025, B 0.0010～0.0030, Al 0.015～0.060, and V 0.10～0.12, and surplus is Fe and trace impurity.Make nitrogen in steel content be not more than 80 * 10 in external refining final vacuum degassing processing
-6, oxygen level is not more than 15 * 10
-6Strand is 1130～1200 ℃ in the soaking temperature of process furnace, and heating and High temperature diffusion time are 4～12h, 1080 ℃ of start rolling temperatures, and 850～1000 ℃ of finishing temperatures are rolled the back slow cooling; Make the round steel of specification Φ 30～130mm.
The preparation method of above-mentioned boron-containing steel, preferred processing condition are as follows:
1. the weight of the molten iron and the pig iron accounts for raw material 50～60% in the feed stock for blast furnace.Do not allow to add high phosphorus, sulphur steel scraps such as slag steel, jar group's iron when noting batching.
2. electric furnace melts clear one-tenth partial objectives for: molten clear carbon 〉=0.30%, molten clear phosphorus≤0.015%, the requirement of residual element content conformance with standard.Fine melt analysis temperature 〉=1540 ℃.
3. electrosmelting terminal point control: [C] 〉=0.10%, P≤0.012%, the requirement of residual element content conformance with standard.
4. during electric furnace steel tapping, adopt alloying and pre-deoxidation in the bag, vanadium iron adds at refining furnace.Pre-deoxidation adds steel core aluminium amount 2.0～2.2kg/t steel in the ladle, and end point carbon is lower than at 0.10% o'clock, adds by the upper limit.Tapping process and tapping back keep ladle to blow Ar continuously.
5. carry out refining at the LF ladle refining furnace, after under white slag, fully stirring in the refining process, get a sample total analysis, get sample before, feeding aluminum steel 1.2～1.5m/ ton steel, refining process keeps white slag.According to a sample analytical results, adjust C, Si, Mn, V chemical ingredients by internally controlling requirement, ferro-boron is handled the back at vacuum degassing refining furnace and is added.By 2.0～2.2m/t steel, feed silicon-calcium wire ∮ 13mm before the tapping.Acid-soluble aluminum content is 0.030～0.050% in the preceding control of the tapping steel.
6. molten steel is skimmed before going into vacuum degassing refining furnace, and vacuum tightness was less than 12～15 minutes 67Pa hold-times.Broken empty back feeds aluminum steel 1.0～1.2m/t steel earlier at the VD station, feed titanium wire 2～3m/t steel again, then little argon gas amount stirs (keeping top of the slag fine motion) 1～2 minute, wraps up in ferro-boron with the aluminium suitcase and inserts in the molten steel, the ferro-boron rate of recovery is calculated by 50～70%, adds the total analysis of taking a sample behind the ferro-boron.8～14 minutes soft blow Ar time.Pay special attention to, must not expose molten steel, argon gas amount stirring cooling greatly during soft blow Ar.
7. continuous casting tundish storing temperature is 1100～1120 ℃; Crystallizer meets the requirements to arc, mouth of a river centering, and nozzle atomization is respond well; The MnB continuous crystallizer protecting slag is adopted in the full guard cast.Tundish liquid level 700 ± 50mm, liquid level fluctuation of crystallizer≤± 2mm.Pulling rate control 0.6-1.2m/min.
8. strand slow cooling: notice that continuously cast bloom can not stop at cold bed, must in time go into to cheat the housing slow cooling, before burial pit uses, earlier with other hot base baking at least 4 hours, 24-30 hour slow cooling time.
9. Heating temperature when rolling: 1130～1200 ℃, allow the temperature difference≤40 ℃, should guarantee the steel billet homogeneous heating 2.5-3 hour heat-up time, prevent decarburization and sticking stove again; 1080 ℃-1150 ℃ of start rolling temperatures; Guarantee 850 ℃-900 ℃ of finishing temperatures; Roll the back and in time collect finished product and slow cooling.
With boron-containing steel production at present relatively, the characteristics of technical solution of the present invention are:
(1) steel of the present invention is controlled the content of micro-B, guarantees the hardening capacity of steel, makes this steel be suitable for making important mechanical component.
(2) handle through electrosmelting-external refining, vacuum outgas, easy oxidation element add-on of control and addition sequence in this process, the adding method, the joining day guarantee chemical ingredients especially the control of effective boron content meet the requirements.
(3) full guard cast prevents secondary oxidation of steel; The low overheat cast prevents the too fast growth of column crystal, increases the strand equiax crystal, alleviates center porosity and segregation; Stably manufactured rhythm makes the pulling rate substantially constant; Rectangular casting blank is selected wind sheltering buttress position stacking slow cooling; Tundish will toast, and guarantees storing temperature 〉=1100 ℃.
(4) rolling and finishing, strict control Heating temperature and rolling temperature guarantee steel homogeneous microstructure, densification, guide and guard, roller-way are conscientiously checked before rolling; According to sinuousness control situation, carry out straightening processing, guarantee the requirement of stocking planeness.The end sawing is neat, and reconditioning is also eliminated the shape of a hoof, overlap, burr and influence is used cuts tiltedly and phenomenons such as flattening.
The smelting of steel, the deoxidation of strengthening steel is degassed to wait and is smelted control, guarantees the content of " effective boron " in the steel; The molten steel cast; die casting or continuous casting; control superheating temperature, pouring speed or casting speed; adopt west, Xixia County to protect the 35MnB privacy protection slag that smelting material company produces; coagulating property according to steel; water allocation model reasonable in design (setting water allocation model according to pulling rate) improves continuous casting billet quality, guarantees ingot quality.
Boron-containing steel of the present invention is widely used in the structural alloy steel of automobile and mechanical industry.
Description of drawings
Fig. 1 is this 35MnB steel hot rolling attitude metallographic structure photo, hot-rolled state: 100 *.Microstructure mainly comprises perlite and ferrite.
Embodiment
The present invention will be further described below in conjunction with specific embodiment, but be not limited thereto.
Embodiment: 35MnB steel
1, the chemical component weight per-cent % of steel is:
C 0.37 Si 0.24 Mn 1.26 P 0.016 S 0.001 B 0.0029 Al 0.023 V 0.091; Surplus is Fe and trace impurity.
2, operational path is:
Batching → electrosmelting → eccentric bottom tapping → LF stove deoxidation alloying → vacuum refining furnace ferro-boron that outgases → add is adjusted the rolling specification ∮ 70mm of becoming a useful person of boron component → billet caster whole process protection casting → semi-tandem rolling → check and is put in storage.
3, preparation method's main technique measure
(1) goes into that the molten iron proportioning reaches 50～60% in the stove iron and steel stock structure; Do not allow to add high phosphorus, sulphur steel scraps such as slag steel, jar group's iron during batching.
(2) the molten clear one-tenth partial objectives for of electric furnace: molten clear carbon 〉=0.30%, molten clear phosphorus≤0.015%, the requirement of residual element content conformance with standard.
(3) smelting process has been made foamy slag, evenly decarburization, reduces and inhales nitrogen.
(4) fine melt analysis temperature 〉=1540 ℃.
(5) electrosmelting terminal point control [C] 〉=0.10%, P≤0.012%, the requirement of residual element content conformance with standard.1620～1640 ℃ of tapping temperatures.
(6) alloying and pre-deoxidation in the bag, vanadium iron adds at refining furnace.Pre-deoxidation adds steel core aluminium amount 2.0～2.2kg/t steel in the ladle, and end point carbon is lower than at 0.10% o'clock, adds by the upper limit.Electric furnace steel tapping process and tapping back keep ladle to blow Ar continuously.
(7) LF ladle refining furnace refining process after fully stirring, is got a sample total analysis under white slag, get sample before, feeding aluminum steel 1.2～1.5m/ ton steel, refining process keeps white slag.According to a sample analytical results, adjust C, Si, Mn, V chemical ingredients by internally controlling requirement, ferro-boron is handled the back at VD and is added.By 2.0～2.2m/t steel, feed silicon-calcium wire (∮ 13mm) before the tapping.Acid-soluble aluminum content is 0.030～0.050% in the preceding control of the tapping steel.
(8) go into preceding the skimming of vacuum degassing refining furnace (being called for short VD), vacuum tightness was less than 14 minutes 67Pa hold-times.Broken empty back feeds aluminum steel 1.0～1.2m/t steel earlier at the VD station, feed titanium wire 2～3m/t steel again, then little argon gas amount stirs (top of the slag fine motion) 1～2 minute, wraps up in ferro-boron with the aluminium suitcase and inserts in the molten steel, the ferro-boron rate of recovery is calculated by 50～70%, adds the total analysis of taking a sample behind the ferro-boron.Soft blow Ar time 〉=8 minute forbid the exposed top of the slag and big argon gas to stir cooling during soft blow Ar.VD handles the back and goes up the steel temperature: the steel temperature is 1575～1585 ℃ on continuous casting first stove, and the steel temperature is 1565～1575 ℃ on all the other heats.
(9) continuous casting tundish storing temperature is 1100-1120 ℃; Crystallizer meets the requirements to arc, mouth of a river centering, and nozzle atomization is respond well; MnB continuous crystallizer protecting slag (protect in the west smelting material company and produces Xixia County) is adopted in the full guard cast.Tundish liquid level 700 ± 50mm, crystallizer stirring parameter 150A/3.0Hz, liquid level fluctuation of crystallizer≤± 2mm.The 35MnBM liquidus temperature is 1497 ℃/1496 ℃, and middle bag superheating temperature is pressed 20～30 ℃ of controls, middle bag first furnace temperature: 1527～1537 ℃, and 1517～1527 ℃ later in second stove.Strand advances 920 ℃ of straightening machine temperature, and pulling rate is controlled with reference to table 1.
Table 1 pulling rate
| Specifications section (mm * mm) | Superheating temperature | Pulling rate (m/min) | Superheating temperature | Pulling rate (m/min) | Superheating temperature | Pulling rate (m/min) |
| 260×300 | <20℃ | 0.70 | 20～25℃ | 0.65 | >25℃ | 0.60 |
| 180×220 | <20℃ | 1.2 | 20～25℃ | 1.1 | >25℃ | 1.0 |
(10) strand slow cooling
Continuously cast bloom does not stop at cold bed, in time goes into to cheat the housing slow cooling, before burial pit uses, toasts more than 4 hours 25 hours slow cooling time earlier with other hot base.
Heating temperature when (11) rolling: 1130～1200 ℃, allow the temperature difference≤40 ℃, heat-up time 〉=2.5 hour should guarantee the steel billet homogeneous heating, prevent decarburization and sticking stove again; Start rolling temperature 〉=1080 ℃; Reinforcement is to the control of rolling rhythm, guarantees finishing temperature 〉=850 ℃; Roll the back and in time collect slow cooling.
Table 2 electric furnace batching situation
Table 3 electrosmelting process record table
Table 4 LF refining process recorder
Table 5 VD treating processes recorder
| Heat (batch) number | Whether skim | Temperature puts in place | Find time in advance | Minimum vacuum tightness | Hold-time | Broken empty temperature | Add B (kg) | Last steel temperature |
| T207-4982 | Be | 1614 | 8 | 30 | 5 | 1573 | 6 | 1566 |
| T207-4983 | Be | 1586 | 7 | 30 | 5 | 1553 | 5.5 | 1550 |
| T207-4984 | Be | 1594 | 7 | 25 | 5 | 1555 | 6 | 1550 |
Table 6 casting process recorder
Table 7 stocking mechanical property
| Heat (batch) number | Tensile strength Rm (MPa) | Yield strength ReL (MPa) | Unit elongation A (%) | Shrinking percentage Z (%) | Ballistic work Aku (J) |
| T207-4982 | 1050/1030 | 930/910 | 14/14 | 52/53 | 60/910 |
| T207-4983 | 1080/1070 | 955/950 | 12/13 | 51/51 | 90/92 |
| T207-4984 | 1020/1050 | 900/920 | 14/14 | 57/55 | 102/106 |
Claims (1)
1, a kind of preparation method of boron-containing steel, comprise that electrosmelting, external refining, continuous-casting of steel billet, semi-tandem rolling are rolling, the chemical ingredients % weight percent of steel is: C 0.33～0.37, and Si 0.15～0.30, and Mn 1.10～1.35, P≤0.025, S≤0.025, B 0.0010～0.0030, and Al 0.015～0.060, V 0.10～0.12, surplus Ti for adding in Fe, trace impurity and the production process; It is characterized in that:
The weight of the molten iron and the pig iron accounts for raw material 50～60% in the preceding feed stock for blast furnace of smelting;
Pre-deoxidation adds steel core aluminium amount 2.0～2.2kg/t steel in the ladle; Feed silicon-calcium wire Φ 13mm by 2.0～2.2m/t steel before the refining furnace tapping; Acid-soluble aluminum content is 0.030～0.050% in the preceding control of the tapping steel;
Molten steel is skimmed before going into vacuum degassing refining furnace, and vacuum tightness was less than 67Pa hold-time 12-15 minute; Broken empty back feeds aluminum steel 1.0～1.2m/t steel earlier at the VD station, feed titanium wire 2～3m/t steel again, stirred 1～2 minute with the little argon gas amount that keeps top of the slag fine motion then, wrap up in ferro-boron with the aluminium suitcase and insert in the molten steel, the ferro-boron rate of recovery is calculated by 50～70%, adds the total analysis of taking a sample behind the ferro-boron;
Handle in the external refining final vacuum degassing and to make that nitrogen in steel content is not more than 80ppm, oxygen level is not more than 15ppm;
Strand is 1130～1200 ℃ in the soaking temperature of process furnace, allows the temperature difference≤30 ℃, and heating and High temperature diffusion time are 4～12h, and casting process wants whole process protection to pour into a mould, and middle bag liquid level is stabilized in 700 ± 50mm; 1080 ℃-1150 ℃ of start rolling temperatures, 850～1000 ℃ of finishing temperatures, roll the round steel of specification Φ 30～130mm.
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| CN101812643B (en) * | 2009-11-30 | 2012-05-30 | 济南钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| ATE551555T1 (en) | 2010-05-31 | 2012-04-15 | Iwis Motorsysteme Gmbh & Co Kg | JOINT CHAIN WITH CHAIN LASTS MADE OF BORON-MANGANESE STEEL |
| CN103447492A (en) * | 2012-05-30 | 2013-12-18 | 通化钢铁股份有限公司 | Production process for eliminating boron micro-alloying hot-rolled steel strip edge faults |
| CN103882302B (en) * | 2012-12-21 | 2016-03-02 | 鞍钢股份有限公司 | N80-Q level straight weld oil annular tube steel and manufacture method thereof |
| CN103273023B (en) * | 2013-06-07 | 2016-12-28 | 鞍钢股份有限公司 | A kind of extra-high manganese steel continuous casting manufacturing technique |
| CN103695600B (en) * | 2013-12-19 | 2015-05-13 | 马钢(集团)控股有限公司 | Low-cost production method of boracic low-alloy-structured steel sheet billet |
| CN107630172B (en) * | 2016-07-18 | 2019-04-26 | 鞍钢股份有限公司 | A method of preventing low-carbon boron-containing steel surface crackle |
| CN108998725A (en) * | 2018-07-17 | 2018-12-14 | 石家庄钢铁有限责任公司 | Track link rail 35MnBM steel and preparation method thereof |
| CN109234607B (en) * | 2018-10-26 | 2020-11-10 | 山东钢铁集团日照有限公司 | Wide slab production method for increasing acid-soluble boron content |
| CN111020103A (en) * | 2019-11-22 | 2020-04-17 | 舞阳钢铁有限责任公司 | Ferroboron adding method and ferroboron adding device for improving acid-soluble boron proportion |
| CN113265584B (en) * | 2021-05-13 | 2022-05-06 | 大冶特殊钢有限公司 | Medium-carbon boron-containing steel and rolling and cooling control method for online normalizing treatment |
| CN114411045B (en) * | 2022-01-25 | 2023-06-27 | 中天钢铁集团有限公司 | Production method of B-alloy-containing structural steel for automobile parts |
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Assignee: Laiwu Steel Group Zibo Anchor Chain Co., Ltd. Assignor: Laiwu Iron & Steel Group Corp., Ltd. Contract fulfillment period: 2008.7.1 to 2015.6.30 contract change Contract record no.: 2009370000150 Denomination of invention: Boron-containing steel and preparation method thereof Granted publication date: 20090617 License type: Exclusive license Record date: 2009.7.7 |
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