CN103386470A - Method for producing large-sized capless steel ingot by using vacuum pouring method - Google Patents
Method for producing large-sized capless steel ingot by using vacuum pouring method Download PDFInfo
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- CN103386470A CN103386470A CN2013103422354A CN201310342235A CN103386470A CN 103386470 A CN103386470 A CN 103386470A CN 2013103422354 A CN2013103422354 A CN 2013103422354A CN 201310342235 A CN201310342235 A CN 201310342235A CN 103386470 A CN103386470 A CN 103386470A
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Abstract
The invention relates to a method for producing a large-sized capless steel ingot by using a vacuum pouring method. The method comprises the following steps: melting waste steel through an eccentric bottom tapping electric arc furnace; adjusting composition and temperature and then tapping; adding alloy into a rear ladle of a molten steel furnace to perform preliminary deoxidation; adding lime into a refining furnace in batches; adding C powder to adjust a slag system so as to perform composite deoxidation; raising temperature and then adding the rest alloy in batches to guarantee that the composition reaches the standard; transmitting power to raise temperature and finally deoxidating a rear bull ladle; selectively pouring the capless steel ingot corresponding to a steel ingot mold; placing a bottom disc and the steel ingot mold in a vacuum tank in sequence; covering a vacuum tank cover; arranging a tundish; performing vacuum suction on the vacuum tank; keeping refined molten steel still and mixing in the tundish; and pouring to form the large-sized capless steel ingot when the temperature of the molten steel reaches a pouring start temperature. By using the method, smooth production of the capless steel ingot can be realized. The molten steel composition and the internal quality can meet the requirements of the capless steel ingot, and high-efficiency large-scale production can be realized; and the vacuum large-sized capless steel ingot has the characteristics of less subsequent machining allowance, raw material saving, short manufacturing period and low cost.
Description
Technical field
The present invention relates to a kind of method that adopts the vacuum pouring mode to produce large-scale stele ingot without casting.
Background technology
The Requirement Increases of market to large-scale barrel-shaped, annular forging piece, large-scale barrel-shaped, the annular forging piece of tradition adopts the forging of large-scale band cap mouth steel ingot to form, this production technology steel ingot utilization rate is lower, as adopts large-scale stele ingot without casting forging to form, and the steel ingot utilization rate can improve 10% left and right.And the ingot shape of the stele ingot without casting of producing in the market is generally less than 40t, can not satisfy the demand preferably.In the prior art, a kind of technical scheme is that the mode that adopts atmosphere to make a bet is produced stele ingot without casting.Along with the requirement of market to product quality improves, also very harsh to gas content requirement in steel, in atmospheric environment, casting process is unfavorable for further reducing gas content in steel.
Summary of the invention
The objective of the invention is for above-mentioned present situation, aim to provide the method that a kind of following process surplus is few, stock utilization is high, cost is low employing vacuum pouring mode is produced large-scale stele ingot without casting.
The implementation of the object of the invention is, the method that adopts the vacuum pouring mode to produce large-scale stele ingot without casting, and concrete steps are as follows:
(1) electric furnace smelting is just made steel water: by eccentric bottom tapping electric arc furnaces melting waste steel, take off C, take off P, the qualified rear tapping of temperature, adjust chemical composition C, P, make C lower than internal control lower limit 0.05～0.15%, after P≤0.010%, temperature T 〉=1640 ℃, tapping, add Si-Fe, the pre-deoxidation of Si-Mn alloy in ladle after the molten steel stove; Si-Fe, Si-Mn additional proportion are 1:5, and the Si-Fe addition is the 1kg/t steel, and the Si-Mn addition is the 5kg/t steel;
(2) refining furnace is smelted the finished product molten steel: add in two batches lime, adding the lime gross weight is 2～4% of Metal Weight percentage, adjusts slag system; Add C, Si powder to carry out top of the slag deoxidation, heat up after 1580 ℃ and add in two batches all the other ferromanganese, ferrochrome, nickel plate, ferro-molybdenum, make composition meet the steel grade requirement, molten steel is carried out VD to be processed, below vacuum≤133Pa, time 〉=the 13min vacuum suction after, power transmission 8～10min, be warmed up to temperature T=1600 ℃～1650 ℃, bull ladle after final deoxidizing;
(3) the large-scale stele ingot without casting of vacuum pouring;
Select the corresponding ingot mould of cast stele ingot without casting, put successively chassis, ingot mould in vacuum tank, cover vacuum container cover, tundish on seat, to carrying out vacuum suction in vacuum tank, vacuum≤133pa, refined molten steel calmness 10 ~ 30 minutes, be blended in tundish molten steel amount=ingot shape+(1～2t); Liquid steel temperature reaches the beginning pouring temperature, pours into large-scale stele ingot without casting.
Employing the present invention can realize large-scale stele ingot without casting is adopted the smooth production of vacuum pouring mode.Molten steel composition, internal soundness all can meet the requirement of large-scale stele ingot without casting, realized the efficient production in enormous quantities of large-scale stele ingot without casting, and ingot shape can be controlled accurately; The large-scale stele ingot without casting following process of vacuum surplus is few, has saved raw material, shortens the manufacturing cycle, has reduced manufacturing cost.
The specific embodiment
Concrete steps of the present invention are as follows:
1) electric furnace smelting is just made steel water: by eccentric bottom tapping electric arc furnaces melting waste steel, steel scrap is packed in electric arc furnaces, power transmission, voltage 280V～340V, electric current 16000A～22000A, 1560 ℃ of fusings, behind the formation molten bath, oxygen blast is fluxed in stove, oxygen blast pressure≤0.8MPa, and in stove steel scrapization clear after, adopt the furnace door carbon oxygen lance making foamed slag.Owing to spraying into carbon dust and oxygen in stove, form violent reaction between carbon and oxygen in stove, can promote the floating of inclusion content in melting steel and the effusion of gas, improve the degree of purity of molten steel; Composition, the qualified rear tapping of temperature, add Si-Fe, the pre-deoxidation of Si-Mn alloy in ladle after stove.
Send point voltage to can be 280V, 300V, 320V, 340V, electric current is 16000A, 16800A, 178OOA, 1960OA, 21000A, 22000A.
2) refining furnace is smelted the finished product molten steel: add in two batches lime to adjust slag system, adding the lime gross weight is 2～4% of Metal Weight percentage, adopt simultaneously Si powder and C powder to carry out top of the slag deoxidation, add in two batches all the other alloys after being warming up to more than 1580 ℃, make molten steel composition be adjusted to standard analysis, molten steel is carried out VD process, guarantee≤below 133Pa vacuum, pumpdown time 〉=13min, feeding temperature-raising after vacuum breaker, final deoxidizing bull ladle;
3) the large-scale stele ingot without casting of vacuum pouring:
1. select in advance the corresponding ingot mould of cast stele ingot without casting, calculate the steel ingot height and break a heat-insulating shield in mould, take under heat-insulating shield along as the molten steel altitude line, be convenient to steel pouring process and control cast highly.
2. vacuum is cheated main casting large band cap mouth steel ingot, and peep-hole can only be observed the above height of cap mouth line, and stele ingot without casting does not have the cap mouth, from peep-hole, can't observe molten steel height in mould, and just chassis and ingot mould are padded., according to the vacuum hole degree of depth, steel ingot height, chassis height, calculate the cushioning height, cushioning height=vacuum hole height-steel ingot height-chassis height.Chassis and ingot mould are pressed the cushioning height padded, in order to observe the molten steel height.
3. put chassis, ingot mould in vacuum tank, cover vacuum container cover, place tundish.
4. check the vacuum tank sealing, wipe clean peep-hole glass on cover, to facilitate the steel situation of watering of observing;
5. start to vacuumize, make vacuum≤133pa, refined molten steel is calm, is blended into tundish: after calm a period of time of the interior molten steel of refining ladle, (10 ~ 30 minutes) are blended in tundish.Will hang electronic scale when tundish is converted molten steel, the interior molten steel amount of injecting of the tundish of controlling well, make molten steel amount=ingot shape+(1～2t).Liquid steel temperature in tundish is measured, reached the beginning pouring temperature to liquid steel temperature, cast.Watch molten steel amount in tundish during cast like a hawk, when last brick of molten steel amount and tundish is concordant, carries out and diffuse preparation,, when the molten steel face reaches the sign graduation mark, in time diffuse, avoid molten steel to find time.
Adopt the present invention to produce large-scale stele ingot without casting, stable operation, composition is even, and, owing to adopting the vacuum pouring mode, can effectively remove gas and field trash in molten steel, has improved the degree of purity of steel, end product quality is met the demands and stable performance.Large-scale barrel-shaped, the annular forging piece that adopts forging of the present invention to form, the steel ingot utilization rate has improved 10%.
Claims (5)
1. the method that adopts the vacuum pouring mode to produce large-scale stele ingot without casting is characterized in that concrete steps are as follows:
(1) electric furnace smelting is just made steel water: by eccentric bottom tapping electric arc furnaces melting waste steel, take off C, take off P, the qualified rear tapping of temperature, adjust chemical composition C, P, make C lower than internal control lower limit 0.05～0.15%, after P≤0.010%, temperature T 〉=1640 ℃, tapping, add Si-Fe, the pre-deoxidation of Si-Mn alloy in ladle after the molten steel stove; Si-Fe, Si-Mn additional proportion are 1:5, and the Si-Fe addition is the 1kg/t steel, and the Si-Mn addition is the 5kg/t steel;
(2) refining furnace is smelted the finished product molten steel: add in two batches lime, adding the lime gross weight is 2～4% of Metal Weight percentage, adjusts slag system; Add C, Si powder to carry out top of the slag deoxidation, heat up after 1580 ℃ and add in two batches all the other ferromanganese, ferrochrome, nickel plate, ferro-molybdenum, make composition meet the steel grade requirement, molten steel is carried out VD to be processed, below vacuum≤133Pa, time 〉=the 13min vacuum suction after, power transmission 8～10min, be warmed up to temperature T=1600 ℃～1650 ℃, bull ladle after final deoxidizing;
(3) the large-scale stele ingot without casting of vacuum pouring;
Select the corresponding ingot mould of cast stele ingot without casting, put successively chassis, ingot mould in vacuum tank, cover vacuum container cover, tundish on seat, to carrying out vacuum suction in vacuum tank, vacuum≤133pa, refined molten steel calmness 10 ~ 30 minutes, be blended in tundish molten steel amount=ingot shape+(1～2t); Liquid steel temperature reaches the beginning pouring temperature, pours into large-scale stele ingot without casting.
2. the employing vacuum pouring mode according to claim 1 method of producing large-scale stele ingot without casting, it is characterized in that steel scrap is packed in electric arc furnaces, power transmission, voltage 280V～340V, electric current 16000A～22000A, 1560 ℃ of fusings, behind the formation molten bath, oxygen blast is fluxed in stove, oxygen blast pressure≤0.8MPa, and in stove steel scrapization clear after, adopt the furnace door carbon oxygen lance making foamed slag.
3. the employing vacuum pouring mode according to claim 1 method of producing large-scale stele ingot without casting, it is characterized in that according to the vacuum hole degree of depth, steel ingot height, chassis height, calculate the cushioning height, cushioning height=vacuum hole height-steel ingot height-chassis height; Chassis and ingot mould are pressed the cushioning height padded.
4. the employing vacuum pouring mode according to claim 1 method of producing large-scale stele ingot without casting, is characterized in that will hanging electronic scale, the required molten steel amount of the ingot shape of controlling well when tundish is converted molten steel.
5. the according to claim 1 or 4 described employing vacuum pouring modes method of producing large-scale stele ingot without casting, while it is characterized in that last brick of pour steel amount and tundish is concordant, carry out and diffuse preparation,, when the molten steel face reaches the sign graduation mark, in time diffuses.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399629A (en) * | 2021-06-10 | 2021-09-17 | 武汉重工铸锻有限责任公司 | Method for producing large uncapped steel ingot by combined steel ingot mould |
| CN116174662A (en) * | 2021-11-26 | 2023-05-30 | 湖北上大模具材料科技股份有限公司 | Manufacturing method of composite steel ingot |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037644A (en) * | 1974-09-23 | 1977-07-26 | Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) | Process for casting steel ingots under a vacuum |
| US20090056840A1 (en) * | 2007-08-27 | 2009-03-05 | China Steel Corporation | Method for manufacturing a sputtering target |
| CN101709350A (en) * | 2009-12-03 | 2010-05-19 | 宝钢集团新疆八一钢铁有限公司 | Method of chromium alloying in gear steel furnace |
| CN102634736A (en) * | 2012-04-13 | 2012-08-15 | 中信重工机械股份有限公司 | Novel 45 MnMo steel for main hoister shafts and preparation method thereof |
-
2013
- 2013-08-06 CN CN2013103422354A patent/CN103386470A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4037644A (en) * | 1974-09-23 | 1977-07-26 | Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) | Process for casting steel ingots under a vacuum |
| US20090056840A1 (en) * | 2007-08-27 | 2009-03-05 | China Steel Corporation | Method for manufacturing a sputtering target |
| CN101709350A (en) * | 2009-12-03 | 2010-05-19 | 宝钢集团新疆八一钢铁有限公司 | Method of chromium alloying in gear steel furnace |
| CN102634736A (en) * | 2012-04-13 | 2012-08-15 | 中信重工机械股份有限公司 | Novel 45 MnMo steel for main hoister shafts and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399629A (en) * | 2021-06-10 | 2021-09-17 | 武汉重工铸锻有限责任公司 | Method for producing large uncapped steel ingot by combined steel ingot mould |
| CN116174662A (en) * | 2021-11-26 | 2023-05-30 | 湖北上大模具材料科技股份有限公司 | Manufacturing method of composite steel ingot |
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Application publication date: 20131113 |