CN102936636A - Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron - Google Patents
Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron Download PDFInfo
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- CN102936636A CN102936636A CN201210464342XA CN201210464342A CN102936636A CN 102936636 A CN102936636 A CN 102936636A CN 201210464342X A CN201210464342X A CN 201210464342XA CN 201210464342 A CN201210464342 A CN 201210464342A CN 102936636 A CN102936636 A CN 102936636A
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Abstract
The invention relates to a method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron. The method is characterized in that end-point molten steel of a converter comprises, by mass, from 0.03% to 0.13% of carbon and from 0.004% to 0.017% of phosphorus, and the tapping temperature ranges from 1605 DEG C to 1660 DEG C; the refining in-location temperature of an LF (ladle furnace) ranges from 1522 DEG C to 1598 DEG C, the refining off-location temperature of the LF ranges from 1613 DEG C to 1650 DEG C, the refining treatment duration ranges from 25 minutes to 58 minutes, and in a later stage of refining, ferro-boron is added according to the composition of the steel TDC66T-1; molten steel obtained after a ladle is refined by the LF is subjected to vacuum degassing treatment by a VD (vacuum degassing) furnace, the deep vacuum duration for smelting by the VD furnace is longer than 10 minutes, the deep vacuum degree is lower than or equal to 0.10Kpa, the soft-blow duration ranges from 10 minutes to 12 minutes; the soft-blow flow rate ranges from 50Nl/min to 60Nl/min, and the feeding temperature ranges from 1562 DEG C to 1575 DEG C; the superheat degree during continuous casting manufacture ranges from 19 DEG C to 30 DEG C, and the casting speed ranges from 0.65m/min to 0.85m/min; and the content of carbon in each continuous casting billet ranges from 0.15% to 0.18%. Accordingly, the requirement of customers for the steel TDC66T-1 on narrow-range composition control for carbon is met, and the steel meeting the requirement of follow-up steel rolling heat treatment on narrow-range composition control can be manufactured for the customers.
Description
Technical field
The present invention relates to the production method of a kind of boracic medium carbon low alloy steel TDC66T-1, belong to metallurgy and metal material field.
Background technology
TDC66T-1 belongs to medium carbon low alloy steel, and the hot rolled circular steel that adopts TDC66T-1 to produce is mainly used in the hot rolling poling.
In order to satisfy the client to the follow-up rolling thermal treatment of this steel and performance requriements, we have developed the Narrow Composition Control that satisfies domestic and international medium carbon low alloy steel and accomplished this steel grade, the complete client's of boracic medium carbon low alloy steel TDC66T-1 that Baogang produces follow-up rolling requirement.
Summary of the invention
The purpose of this invention is to provide a kind of boracic outlet production method of TDC66T-1 steel.
Concrete solution of the present invention is as follows:
1, converter production
For guaranteeing that quality product reaches the accurate control to the finished product composition, require for the converter molten iron: press the mass percent phosphorus content less than or equal to 0.13%, sulphur content is less than or equal to 0.050%.In converter steelmaking process, add the slag making auxiliary materials such as lime, rhombspar, fluorite, require adding silicon manganese and aluminium manganese-titanium to carry out deoxidation alloying according to finished product TDC66T-1 composition in the tapping process.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as follows:
Tapping temperature 1605-1660 ℃, average 1635 ℃; Carbon content 0.03-0.13%, average 0.08%; Phosphorus content 0.004-0.017%, average 0.12%;
2, the LF stove is produced
Temperature 1522-1598 in place ℃ of LF stove refining, average 1560 ℃; Refining is offed normal temperature 1613-1650 ℃, average 1626 ℃; Refining treatment time 26-58 min, average 39 min; And add ferro-boron in the refining later stage by the requirement of TDC66T-1 composition.
3, the VD stove is produced
Molten steel further reduces obnoxious flavour content in the steel again through VD stove Fruit storage, improves the cleanliness factor of steel, and gas content requires: [O]≤50ppm; [N]≤90ppm; [H]≤2.5ppm.The feeding silicon-calcium wire carries out inclusion modification after the refining.Require the dark vacuum time of VD stove smelting all greater than 10min, dark vacuum tightness≤0.10Kpa, soft blow time 10-12min, average 11min; Soft blow flow 50-60 Nl/min, average 53Nl/min; 1562-1575 ℃ of the temperature of appearing on the stage, average 1568 ℃.
4, continuous casting production
Superheating temperature is controlled between 19-30 ℃ in the continuous casting production, and pulling rate is between 0.65m/min-0.85m/min.
Advantage of the present invention is: under the prerequisite of existing operational path, adopt the Narrow Composition Control of specific smelting technology and carbon, produce and satisfy the follow-up steel rolling heat treatment requirements of client Narrow Composition Control, satisfy the customer requirement round steel from most economical again the easiest method.
Embodiment
Industrial manufacture process is summarized as follows:
Vacuum outgas-the bloom continuous casting of the ladle furnace refining of converter smelting-(LF)-(VD) (280mm * 380mm)-special steel is rolling.
Industrial production more than 100 stoves, concrete process parameter control is as follows:
1) converter production
Add lime 2600-3700kg according to practical situation during converter smelting, rhombspar 800-2800kg, iron sheet 500-2000kg adds silicon manganese 900kg, aluminium manganese titanium 250kg in the tapping process.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as shown in table 1.
The composition of table 1 converter tapping and temperature
2) the LF stove is produced
The refining of LF stove adds the auxiliary material slag making according to molten steel composition and temperature variation, adds that alloy is finely tuned and warming temperature.Add lime 500-800kg, fluorite 60-150kg, alumina 150-200kg, calcium carbide 100kg, alloy is finely tuned ferromanganese 50-300kg according to refining composition in place, ferrosilicon 80-200kg, ferro-boron 15kg, feeding aluminum steel 100m, liquid steel temperature and treatment time see Table 2.
The control of table 2 refining LF furnace temperature
3) the VD stove is produced
Molten steel further reduces obnoxious flavour content in the steel through VD stove Fruit storage after the ladle LF refining, improves the cleanliness factor of steel, and gas content requires: [O]≤50ppm; [N]≤90ppm; [H]≤2.5ppm, feeding silicon-calcium wire 100m carries out inclusion modification after the refining.Require the dark vacuum time of VD stove smelting all more than or equal to 13min, other processing parameter sees Table 3.
The table 3 refining furnaceman VD control of planting
4) continuous casting production
Superheating temperature is controlled between 19-30 ℃ in the continuous casting production, pulling rate is between 0.65m/min-0.85m/min, the composition of molten steel (mass percent) control is as shown in table 4, the continuously cast bloom carbon component is controlled between the mass percent 0.15-0.18%, realized the Narrow Composition Control of the carbon of TDC66T-1 steel customer requirement, produced and satisfy the follow-up steel rolling heat treatment requirements of client Narrow Composition Control.
Table 4 finished product composition (at%)
5) surface quality
The defectives such as surface crack are not found on continuously cast bloom table surface, satisfy the surface quality requirement of producing hot rolled circular steel fully.
Claims (1)
1. the production method of a boracic medium carbon low alloy steel TDC66T-1 is characterized in that: produce molten iron for converter and require: press the mass percent phosphorus content less than or equal to 0.13%, sulphur content is less than or equal to 0.050%; In converter steelmaking process, add slag making raw material and control tapping carbon, phosphorus content, require adding silicon manganese and aluminium manganese-titanium to carry out deoxidation alloying according to finished product TDC66T-1 composition of steel in the tapping process, mass percent carbon content 0.03-0.13%, the phosphorus content 0.004-0.017% of converter terminal molten steel, tapping temperature 1605-1660 ℃; Temperature 1522-1598 in place ℃ of LF stove refining, refining are offed normal temperature 1613-1650 ℃, refining treatment time 25-58 min, and the refining later stage presses the TDC66T-1 composition of steel and adds ferro-boron; Molten steel is through VD stove Fruit storage after the ladle LF refining, and the dark vacuum time that the VD stove is smelted is greater than 10min, dark vacuum tightness≤0.10Kpa, soft blow time 10-12min; Soft blow flow 50-60 Nl/min, 1562-1575 ℃ of the temperature of appearing on the stage; Superheating temperature is controlled between 19-30 ℃ in the continuous casting production, and pulling rate is between 0.65m/min-0.85m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210464342XA CN102936636A (en) | 2012-11-16 | 2012-11-16 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
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| CN201210464342XA CN102936636A (en) | 2012-11-16 | 2012-11-16 | Method for manufacturing medium-carbon low-alloy steel TDC66T-1 containing boron |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469048A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Boron-containing steel boron alloying treatment method |
| CN103695599A (en) * | 2013-12-16 | 2014-04-02 | 江油市长祥特殊钢制造有限公司 | Low-alloy steel CBM20 microalloying method |
| CN107475485A (en) * | 2017-08-07 | 2017-12-15 | 唐山钢铁集团有限责任公司 | The control method of the narrow composition of LF refining automobile steel alloy |
| CN115627409A (en) * | 2022-10-24 | 2023-01-20 | 石钢京诚装备技术有限公司 | Production method for reducing surface crack rate of medium-carbon boron-containing round steel |
| CN116024488A (en) * | 2022-12-30 | 2023-04-28 | 包头钢铁（集团）有限责任公司 | Production method of heavy truck automobile axle sleeve steel |
-
2012
- 2012-11-16 CN CN201210464342XA patent/CN102936636A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 姜琛等: "TDC66热轧圆管坯试制", 《包钢科技》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469048A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Boron-containing steel boron alloying treatment method |
| CN103469048B (en) * | 2013-09-06 | 2015-10-07 | 鞍钢股份有限公司 | The boron alloyed treatment process of a kind of boron-containing steel |
| CN103695599A (en) * | 2013-12-16 | 2014-04-02 | 江油市长祥特殊钢制造有限公司 | Low-alloy steel CBM20 microalloying method |
| CN107475485A (en) * | 2017-08-07 | 2017-12-15 | 唐山钢铁集团有限责任公司 | The control method of the narrow composition of LF refining automobile steel alloy |
| CN107475485B (en) * | 2017-08-07 | 2019-05-24 | 唐山钢铁集团有限责任公司 | The control method of the narrow ingredient of LF refining automobile steel alloy |
| CN115627409A (en) * | 2022-10-24 | 2023-01-20 | 石钢京诚装备技术有限公司 | Production method for reducing surface crack rate of medium-carbon boron-containing round steel |
| CN116024488A (en) * | 2022-12-30 | 2023-04-28 | 包头钢铁（集团）有限责任公司 | Production method of heavy truck automobile axle sleeve steel |
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Application publication date: 20130220 |