CN101474743A - Method for producing alloy plastic die steel using direct hot delivery and hot charging technique - Google Patents
Method for producing alloy plastic die steel using direct hot delivery and hot charging technique Download PDFInfo
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- CN101474743A CN101474743A CNA2008102247319A CN200810224731A CN101474743A CN 101474743 A CN101474743 A CN 101474743A CN A2008102247319 A CNA2008102247319 A CN A2008102247319A CN 200810224731 A CN200810224731 A CN 200810224731A CN 101474743 A CN101474743 A CN 101474743A
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Abstract
A method which adopts direct hot feeding and hot charging technique for manufacturing alloy plastic mold steel belongs to the technical field of medium steel plate. The technique comprises the steps of furnace revolving, LF desulfurizing, RH vacuum degassing, continuous casting, cutting, hot feeing, hot charging and heating. The continuous casting sheet billet with thickness of 200-380mm is hot fed and hot charged into a heating furnace after wire cutting without slowly cooling or annealing. The superheat degree of continuous casing pouring is controlled to 10-30 DEG C. The pulling rate is matched with superheat degree and is controlled to 0.7-1.0m/min. The plate bank is directly fed to a heating furnace through the hot feeding roller conveyor after linear fixed-length cutting. The plate blank can be executed with the hot charging technique after linear fixed-length cutting if surface checking or other production organization problem occurs. The plate blank is hotly charged into the heating furnace at a temperature which is larger than or equal to 550 DEG C after checking out of production line. When the plate blank is charged into the heating furnace, the temperature of heating furnace is between 500 and 700 DEG C, and the temperature of preheating section is between 450 and 600 DEG C. The method of the invention has the advantages of excellent heating quality of plate blank according to the technique, shorted production period, and reduced energy consumption of heating furnace.
Description
Technical field
The invention belongs to cut deal steel plate technical field, the method that particularly provides a kind of employing direct heat to send (DHCR), hot charging (HCR) explained hereafter alloy plastic die steel, this process reform the production procedure before the billet rolling.Original technological process need take burial pit or annealing furnace, and scheduling gets up to waste time and energy, and by the optimization to production technology, has changed rhythm of production and technological process, in the production direct motion, makes alloy plastic die steel reach the better heating quality.
Background technology
The production of alloy plastic die steel belongs to the special steel field usually, and the mould steel production line of specialty generally adopts the die casting mode both at home and abroad, and ingot casting is heat-treated then through split rolling method, and lumber recovery is lower and cost is higher.Development along with the Heavy Plate Production technology, some Heavy Plate Plant have begun to adopt the continuous casting mode to produce such as alloy plastic die steels such as P20, because the alloying element content in the steel is higher, the transformation stress of steel cracks than Da Yi, therefore need into burial pit slow cooling or carry out annealing in process after continuous casting billet rolls off the production line, this method has been applied in the production of alloy part plastic die steel.
Patent of the present invention provides a kind of production technology that adopts continuous casting hot delivery and hot charging explained hereafter alloy plastic die steel, can make production direct motion in big production of P20, reduces production costs, and shortens the production cycle.
Summary of the invention
The object of the present invention is to provide a kind of method that direct heat is sent, hot-mounting process is produced alloy plastic die steel that adopts, simplified the production procedure of traditional moulds steel, reduce production cost of products and can shorten the production cycle.
Alloy plastic die steel steel billet of the present invention is middle carbon content and the steel grade with higher alloy content, chemical composition by mass percent is: C:0.25～0.40%, Si:0.30～0.70%, Mn:0.5～1.50%, P :≤0.030%, S≤0.030%, Cr:1.40～2.00%, Mo:0.30～0.60%, Ni:0.01～1.20%, surplus is Fe.
The present invention adopts the molten steel of converter or the above-mentioned chemical composition of electric furnace smelting, adopting slab caster cast thickness is the continuous casting billet of 200-380mm, the online cutting of slab back hot delivery and hot charging is gone into heating furnace, need not slow cooling or annealing, the appearance of crackle when steel slab has been avoided the slab heating, the slab heating quality satisfies rolling demand fully.Specifically carry out according to following steps:
1) hot delivery and hot charging process route: converter+LF desulfurization+RH vacuum outgas+continuous casting+cutting+heat is sent+hot charging+heating; Molten steel pours into slab after LF, RH refining, heat is delivered to heating furnace and carried out hot charging and go into stove then; Need not slow cooling or annealing;
2) molten steel that adopts mentioned component to smelt adopts the continuous casting mode to pour into a mould the slab that thickness is 200-380mm, and the cast degree of superheat is controlled at 10-30 ℃, and pulling rate and degree of superheat coupling are controlled at 0.7-1.0m/min;
3) the online scale cutting of slab is after heat send roller-way directly to deliver to heating furnace (DHCR);
4) hot-mounting process (HCR) can be implemented as surface inspection or other organization of production problems in the online scale of slab cutting back, promptly under the slab behind the ray examination under 550-650 ℃ temperature hot charging to heating furnace;
When 5) slab was gone into heating furnace, when the furnace temperature slab of heating furnace was gone into heating furnace, the furnace temperature of heating furnace was not higher than 500-700 ℃, 450-600 ℃ of preheating section temperature.
The production technology of employing sheet billet continuous casting explained hereafter alloy plastic die steel involved in the present invention, the degree of superheat and pulling rate by the control casting process, can produce the rolling blank that is equal to or is better than ingot casting, enhance productivity, the recovery rate and the lumber recovery of molten steel have been improved simultaneously, because continuous casting process is cold by force, can obtain fine and close more steel billet institutional framework.
Slab direct heat involved in the present invention is sent, hot-mounting process is at the above hot charging of bainitic transformation temperature spot of steel, can avoid slab under the air cooling condition bainitic transformation to take place, thereby avoid the generation of structural stress crackle.This technology can shorten the production cycle simultaneously, reduces the energy resource consumption of heating furnace.
Description of drawings
Fig. 1 is the static CCT curve of embodiment 2.
The specific embodiment
The liquidus temperature of the molten steel of composition shown in the table 1 is 1490 ℃, and the cast section is the steel billet of 220 * 1800mm on slab caster, and the degree of superheat when normally pouring into a mould is controlled at 10-30 ℃, and when overheated Δ T＜10 ℃, pulling rate is 0.9m/min; When 10≤Δ T＜25 ℃, pulling rate is 0.8m/min; When 25≤Δ T＜30 ℃, pulling rate is 0.75m/min.Under the coupling of this temperature and pulling rate,, realize solidifying of slab by the automatic distribution water cooling.
The steel billet chemical composition of table 1 embodiment 1, %
Adopt above technology to pour into a mould the P20 steel billet that the face of resolving is 220 * 1800mm on slab caster, the surperficial zero defect of steel billet need not be cleared up, and has reached the requirement of hot delivery and hot charging steel billet.
Embodiment 2
The temperature in steel billet online when cutting is more than 850 ℃, cutting back steel billet send roller-way directly to deliver to heating furnace through heat, the steel slab surface temperature drop is about 100-200 ℃ therebetween, surface temperature when going into stove is more than 650 ℃, be higher than the bainitic transformation temperature, thereby can avoid going into the bainitic transformation of stokehold.
The heat of the P20 steel ingot simulation continuous casting steel billet that employing 100kg vacuum drying oven is smelted is sent, hot charging, and the steel ingot composition is as shown in table 2.
The steel ingot composition of table 2 embodiment 2, %
As shown in Figure 1, the bainitic transformation temperature range of experiment steel ingot is 300-470 ℃, promptly bainitic transformation can take place under the air cooling condition.
Carry out 550 ℃ annealing after the demoulding of 1# steel ingot, the cold ingot after the annealing is gone into the heating furnace heating, and heating furnace soaking zone temperature is 400-500 ℃, and time inside furnace is 3 hours.Carry out split rolling method after the 1# steel ingot is come out of the stove, plate quality is good.
The heat of 2# steel ingot simulation continuous casting steel billet is sent, hot-mounting process, go into heating furnace after the steel ingot demoulding in 600-700 ℃ temperature range, heating furnace preheating section temperature is 550-650 ℃, and time inside furnace is 2.5 hours, carry out split rolling method after steel ingot is come out of the stove immediately, quality problems such as crackle do not occur.
Claims (3)
1. one kind is adopted the method that direct heat is sent, hot-mounting process is produced alloy plastic die steel, it is characterized in that technology is:
(1) hot delivery and hot charging process route: converter+LF desulfurization+RH vacuum outgas+continuous casting+cutting+heat is sent+hot charging+heating; Molten steel pours into slab after LF, RH refining, heat is delivered to heating furnace and carried out hot charging and go into stove then;
(2) molten steel adopts the continuous casting mode to pour into a mould the slab that thickness is 200-380mm, and the cast degree of superheat is controlled at 10-30 ℃, and pulling rate and degree of superheat coupling are controlled at 0.7-1.0m/min;
(3) the online scale cutting of slab is after heat send roller-way directly to deliver to heating furnace DHCR;
When (4) slab was gone into heating furnace, the furnace temperature of heating furnace was between 500-700 ℃, and the preheating section temperature is between 450-600 ℃.
2. according to claim 1 described method, it is characterized in that, described alloy plastic die steel steel billet chemical composition by mass percent is: C:0.25～0.40%, Si:0.30～0.70%, Mn:0.5～1.50%, P :≤0.030%, S≤0.030%, Cr:1.40～2.00%, Mo:0.30～0.60%, Ni:0.01～1.20%, surplus are Fe.
3, according to claim 1 described method, it is characterized in that, after the online scale cutting of the plate slab of step (3), when meeting surface inspection or other organization of production problems, when implementing hot-mounting process, under the slab behind the ray examination under 550-650 ℃ temperature hot charging to heating furnace.
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| CNA2008102247319A CN101474743A (en) | 2008-12-26 | 2008-12-26 | Method for producing alloy plastic die steel using direct hot delivery and hot charging technique |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942557A (en) * | 2010-09-20 | 2011-01-12 | 秦皇岛首秦金属材料有限公司 | Method for controlling hot-conveying charging temperature of casting blanks accurately |
| CN102198504A (en) * | 2011-06-27 | 2011-09-28 | 南京钢铁股份有限公司 | Production technology of mirror-surface plastic die steel |
| CN102199697A (en) * | 2011-06-08 | 2011-09-28 | 河北省首钢迁安钢铁有限责任公司 | Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines |
| CN102392183A (en) * | 2011-10-31 | 2012-03-28 | 柳州钢铁股份有限公司 | Method for producing niobium-containing micro alloy steel |
| CN102496095A (en) * | 2011-11-24 | 2012-06-13 | 北京首钢自动化信息技术有限公司 | Hot-charging logistics tracking, monitoring and dynamic scheduling system |
| CN109706397A (en) * | 2019-01-18 | 2019-05-03 | 东北大学 | A kind of pre-hardened plastic mold steel and preparation method thereof |
| CN110102729A (en) * | 2019-05-24 | 2019-08-09 | 山东钢铁股份有限公司 | A kind of quick hot sending device and hot sending method of continuous casting high alloy die steel round billet |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
| CN113649537A (en) * | 2021-07-05 | 2021-11-16 | 包头钢铁（集团）有限责任公司 | Hot charging and hot conveying method for wide and thick plate blank |
| WO2024125055A1 (en) * | 2022-12-14 | 2024-06-20 | 南阳汉冶特钢有限公司 | Large-thickness sm3cr2ni1mo mold steel and production method therefor |
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2008
- 2008-12-26 CN CNA2008102247319A patent/CN101474743A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942557A (en) * | 2010-09-20 | 2011-01-12 | 秦皇岛首秦金属材料有限公司 | Method for controlling hot-conveying charging temperature of casting blanks accurately |
| CN102199697A (en) * | 2011-06-08 | 2011-09-28 | 河北省首钢迁安钢铁有限责任公司 | Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines |
| CN102198504A (en) * | 2011-06-27 | 2011-09-28 | 南京钢铁股份有限公司 | Production technology of mirror-surface plastic die steel |
| CN102392183A (en) * | 2011-10-31 | 2012-03-28 | 柳州钢铁股份有限公司 | Method for producing niobium-containing micro alloy steel |
| CN102496095A (en) * | 2011-11-24 | 2012-06-13 | 北京首钢自动化信息技术有限公司 | Hot-charging logistics tracking, monitoring and dynamic scheduling system |
| CN109706397A (en) * | 2019-01-18 | 2019-05-03 | 东北大学 | A kind of pre-hardened plastic mold steel and preparation method thereof |
| CN110102729A (en) * | 2019-05-24 | 2019-08-09 | 山东钢铁股份有限公司 | A kind of quick hot sending device and hot sending method of continuous casting high alloy die steel round billet |
| CN110102729B (en) * | 2019-05-24 | 2022-03-08 | 山东钢铁股份有限公司 | Rapid hot conveying device and method for continuous casting high-alloy die steel round billet |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
| CN113649537A (en) * | 2021-07-05 | 2021-11-16 | 包头钢铁（集团）有限责任公司 | Hot charging and hot conveying method for wide and thick plate blank |
| WO2024125055A1 (en) * | 2022-12-14 | 2024-06-20 | 南阳汉冶特钢有限公司 | Large-thickness sm3cr2ni1mo mold steel and production method therefor |
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Application publication date: 20090708 |