CN104962683A - Smelting method of steel containing nitrogen - Google Patents
Smelting method of steel containing nitrogen Download PDFInfo
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- CN104962683A CN104962683A CN201510366458.3A CN201510366458A CN104962683A CN 104962683 A CN104962683 A CN 104962683A CN 201510366458 A CN201510366458 A CN 201510366458A CN 104962683 A CN104962683 A CN 104962683A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a smelting method of steel containing nitrogen. The smelting method comprises the processes of electric furnace smelting, LF furnace refining, VD furnace vacuum treatment and pouring; in the VD furnace vacuum treatment process, nitrogen bottom blowing is conducted, and molten steel is stirred; after the vacuum treatment is over, nitrogen bottom blowing is conducted till the pouring temperature is achieved, and crane ladle pouring is conducted. According to the smelting method of the steel containing the nitrogen, operation is easy and convenient, the defects that due to the fact that nitrogenized manganese alloy is added into the molten steel, the yield is low, the price is high, the smelting cost is higher, and the nitrogen content is not stable are overcome; meanwhile, the situation that due to the fact that impurities of nitrogenized manganese alloy are brought into steel, the impurities in the steel are increased, and the flaw detection of a steel plate is prone to disqualification is avoided. According to the smelting method of the steel containing the nitrogen, the cost is low, the nitrogen content of the steel is stable, the quality of the steel is effectively improved, the production efficiency can be effectively improved, and the production cost is reduced.
Description
Technical field
The invention belongs to field of steel metallurgy, especially a kind of smelting process of nitrogen content in steel 0.010% ~ 0.030% nitrogenous steel.
Background technology
The smelting process of the Hi-Stren steel of certain nitrogen content is had to be generally: converter or electrosmelting, the refining of LF stove, the vacuum-treat of VD stove, cast; In smelting process, the nitrogen removed in steel is difficult to, but equally very difficult to nitrogen pick-up in steel.In the molten steel of converter smelting, nitrogen content is generally between 0.0030wt% ~ 0.0050wt%, and in the molten steel of electrosmelting, nitrogen content is generally between 0.0040wt% ~ 0.0080wt%, with adopted starting material and the pig iron (or molten iron) proportion relation larger.So nitrogen content will to be made in the molten steel of electrosmelting lower than 0.0040wt%, or be all very difficult higher than 0.0080wt%.Eaf process mode, first furnace is smelted complete, nitrogen content in molten steel is generally between 0.0050wt% ~ 0.0070wt%, LF refining furnace through smelting (process adopt blowing argon gas stir) after a while, the high temperature of electric arc more than 2000 degree, nitrogen in air resolves into nitrogen-atoms, and molten steel directly contacts with nitrogen-atoms, is partly dissolved in molten steel, so the LF stage, nitrogen content in molten steel increases to some extent, but increasing amount is generally within 10wt%.General to VD vacuum-treat stage (process adopts blowing argon gas to stir), the dividing potential drop of nitrogen reduces, and the part nitrogen in molten steel can leave molten steel along with Argon Bubble, so the nitrogen content in general VD stage molten steel reduces (process adopts blowing argon gas to stir).But even if like this, VD removes nitrogen also can only reduce 10wt% ~ 30wt%, even if extend VD time, effect might as well be not how many.
In the past adopted nitrogen pick-up technique adds expensive nitrogenized manganese alloy at vacuum-treat forward direction molten steel, but the recovery rate of nitrogenized manganese is low, and recovery rate is unstable, has influence on normal production.In steel, add nitrogenized manganese after changing again vacuum-treat into, recovery rate is low to increase; The contaminating impurity molten steel that one side nitrogenized manganese alloy is brought into, affects the purity of molten steel; On the other hand, stir after adding nitrogenized manganese alloy process, and the easy secondary oxidation of molten steel finally causes steel plate inspection qualification rate low.
Summary of the invention
The technical problem to be solved in the present invention is to provide the smelting process of the stable nitrogenous steel of a kind of nitrogen content in steel.
For solving the problems of the technologies described above, the technical solution used in the present invention is: it comprises electrosmelting, the refining of LF stove, the vacuum-treat of VD stove and casting process, in described VD stove vacuum process, and bottom blowing nitrogen gas stirring molten steel; After vacuum-treat terminates, bottom blowing nitrogen reaches teeming temperature to molten steel, and bull ladle is poured into a mould.
In VD stove vacuum process of the present invention, bottom blowing nitrogen pressure is 0.20MPa ~ 0.60MPa, and flow is 120 ~ 300 liters/min; After described vacuum-treat terminates, bottom blowing nitrogen pressure is 0.12MPa ~ 0.25MPa, and flow is 20 ~ 80 liters/min.
In LF stove refining process of the present invention, argon gas is adopted to stir.
During casting process employing die casting of the present invention, adopt nitrogen as shielding gas.
Nitrogenous nitrogen content in steel 0.010wt% ~ 0.030wt% of the present invention.
The beneficial effect adopting technique scheme to produce is: the present invention is easy and simple to handle, avoid and in molten steel, add nitrogenized manganese alloy and the weak point that recovery rate is low, expensive, smelting cost is higher, nitrogen content is unstable caused, avoid nitrogenized manganese alloy strip people inclusion makes steel inclusion increase simultaneously, and the situation easily causing steel plate inspection not conform to occurs.The present invention not only cost is low, and nitrogen content in steel is stablized, and also effectively improves the quality of steel; The effective improving production efficiency of energy, reduces production cost.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
The smelting process of this nitrogenous steel adopts following processing step:
(1) LF stove refining: the molten steel that electrosmelting goes out, stirs with argon gas without nitrogen at LF stove, is conducive to liquid steel desulphurization, shorten smelting cycle.Molten steel LF refining through slag making, deoxidation, desulfurization, adjustment chemical composition, remove inclusion, the factors such as according to steel grade nitrogen content height, molten steel amount is how many, ladle situation adjust to suitable temperature, and bull ladle is skimmed.
(2) VD stove vacuum-treat: the ladle after skimming puts into vacuum tank, connect the permeability cell of ladle bottom, be blown into nitrogen, opened by molten steel top blast, (also first can be backed down in molten steel face with the argon gas that pressure is larger, then gain nitrogen) feeds aluminum steel, fine setting alloying constituent.Nitrogen pressure is adjusted to 0.20MPa ~ 0.60MPa, and nitrogen flow adjusts to 120 ~ 300 liters/min; Buckle vacuum container cover, start to start vacuum-treat program.
In vacuum process, after vacuum tightness is pressed onto below 66.7Pa from air, enters vacuum and keep the stage, after 15 ~ 30 minutes hold-times, remove vacuum.Subsequently nitrogen pressure is adjusted to 0.12MPa ~ 0.25MPa, the nitrogen flow amount of adjusting to 20 ~ 80 liters/min; Nitrogen blowing is until molten steel meets the requirements of teeming temperature, and close nitrogen, according to temperature conditions, the nitrogen blowing time is generally 10 ~ 25 minutes; Bull ladle is poured into a mould.
(3) if continuous casting, because gating system is closed better, other measure need not be taked; If die casting, then adopt nitrogen protection cast, can avoid molten steel secondary oxidation on the one hand, the nitrogen that can reduce on the other hand in steel is separated out.
Embodiment 1-6: the nitrogen content in the concrete production technique of the smelting process of this nitrogenous steel and finished product is in table 1.
Table 1: each embodiment processing condition
Test example: Hebei steel mill adopts steel 45 stove of this smelting process production nitrogen content 0.010wt% ~ 0.030wt%; In products obtained therefrom, the minimum 0.0118wt% of nitrogen content, the highest 0.0175wt% of nitrogen content, nitrogen content qualification rate 100%.
Claims (5)
1. a smelting process for nitrogenous steel, it comprises electrosmelting, the refining of LF stove, the vacuum-treat of VD stove and casting process, it is characterized in that: in described VD stove vacuum process, bottom blowing nitrogen gas stirring molten steel; After vacuum-treat terminates, bottom blowing nitrogen reaches teeming temperature to molten steel, and bull ladle is poured into a mould.
2. the smelting process of a kind of nitrogenous steel according to claim 1, is characterized in that: in described VD stove vacuum process, bottom blowing nitrogen pressure is 0.20MPa ~ 0.60MPa, and flow is 120 ~ 300 liters/min; After described vacuum-treat terminates, bottom blowing nitrogen pressure is 0.12MPa ~ 0.25MPa, and flow is 20 ~ 80 liters/min.
3. the smelting process of a kind of nitrogenous steel according to claim 1, is characterized in that: in described LF stove refining process, adopts argon gas to stir.
4. the smelting process of a kind of nitrogenous steel according to claim 1, is characterized in that: during described casting process employing die casting, adopt nitrogen as shielding gas.
5. the smelting process of a kind of nitrogenous steel according to claim 1-4 any one, is characterized in that: described nitrogenous nitrogen content in steel 0.010wt% ~ 0.030wt%.
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| CN201510366458.3A CN104962683A (en) | 2015-06-29 | 2015-06-29 | Smelting method of steel containing nitrogen |
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| CN201510366458.3A CN104962683A (en) | 2015-06-29 | 2015-06-29 | Smelting method of steel containing nitrogen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107315A1 (en) * | 2016-12-12 | 2018-06-21 | 孙瑞涛 | Two-step method for smelting high-nitrogen steel at normal pressure |
| CN108998632A (en) * | 2018-09-04 | 2018-12-14 | 本钢板材股份有限公司 | A kind of increasing method for nitrogen of pinion steel 18CrMnBH |
| CN111334642A (en) * | 2020-03-12 | 2020-06-26 | 江阴兴澄特种钢铁有限公司 | Smelting and pouring method of sulfur-containing and nitrogen-containing molten steel |
| CN111534665A (en) * | 2020-06-30 | 2020-08-14 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
-
2015
- 2015-06-29 CN CN201510366458.3A patent/CN104962683A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107315A1 (en) * | 2016-12-12 | 2018-06-21 | 孙瑞涛 | Two-step method for smelting high-nitrogen steel at normal pressure |
| CN108998632A (en) * | 2018-09-04 | 2018-12-14 | 本钢板材股份有限公司 | A kind of increasing method for nitrogen of pinion steel 18CrMnBH |
| CN111334642A (en) * | 2020-03-12 | 2020-06-26 | 江阴兴澄特种钢铁有限公司 | Smelting and pouring method of sulfur-containing and nitrogen-containing molten steel |
| CN111334642B (en) * | 2020-03-12 | 2022-05-06 | 江阴兴澄特种钢铁有限公司 | Smelting and casting method of sulfur-containing and nitrogen-containing molten steel |
| CN111534665A (en) * | 2020-06-30 | 2020-08-14 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
| CN111534665B (en) * | 2020-06-30 | 2022-02-01 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
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Application publication date: 20151007 |