CN101709350B - Method of chromium alloying in gear steel furnace - Google Patents
Method of chromium alloying in gear steel furnace Download PDFInfo
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- CN101709350B CN101709350B CN2009101135522A CN200910113552A CN101709350B CN 101709350 B CN101709350 B CN 101709350B CN 2009101135522 A CN2009101135522 A CN 2009101135522A CN 200910113552 A CN200910113552 A CN 200910113552A CN 101709350 B CN101709350 B CN 101709350B
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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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Abstract
The invention discloses a method of chromium alloying in a gear steel furnace. In an electric furnace smelting procedure, a smelting operation is carried out in an electric furnace according to an operation instruction of gear steel production, and the adding amount of molten iron or iron blocks of electric furnace proportioning accounts for 35 percent of total amount of furnace burdening; in the intermediate stage of oxidizing period of smelting, blowing oxygen decarburization is carried out, temperature is increased, the oxygen supply intensity is 1.8 square meters/t*min, and the amount of carbon powder sprayed into the furnace is 7.2 Kg per ton of steel; in the late stage of the oxidizing period of the smelting, when end-point carbon of the electric furnace approaches to 0.10 to 0.20 percent, and the temperature reaches to over 1600 DEG C, oxidizing slag in the furnace is discharged form a port of the electric furnace, ferrochrome which accounts for 80 weight percent of high carbon ferrochrome is added into the furnace after an electric furnace cover is opened, at the time, the oxygen supply flux of the electric furnace is controlled to be 1000 to 1500 square meters/h, the end-point carbon is controlled within 0.10-0.15 percent according to the requirement of carbon content of the steel, and the tapping temperature is 1620 DEG C; and deoxidizing alloy and siliconmanganese alloy are added during tapping to deoxidize and alloy molten steel, ferrotitanium is added in an LF refining furnace, and the rest of 20 percent of ferrochrome is additionally added into the refining furnace.
Description
Technical field
The invention belongs to the improvement, particularly method of chromium alloying in gear steel furnace of electrosmelting Pinion Steel (20GrMnTi) alloy addition method.
Background technology
Pinion Steel (20GrMnTi) belongs to structural alloy steel, and alloy addition is big.Traditional technology is alloying in ladle, and alloy need be baked to about 600 ℃, requires the eaf tapping point carbon content to be controlled at 0.06-0.09%, and terminal temperature will reach more than 1650 ℃.
The relation long-pending: [%C] * [%O]=m according to C, O concentration;
In the formula: carbon in [%C]-molten steel;
Dissolved oxygen in [%O]-molten steel;
The m--equilibrium constant.
As can be known, under the certain situation of temperature, [O] in the steel increases with the reduction of carbon, and high temperature then makes the solubleness of molten steel increase, so low-carbon (LC) and high temperature will make the oxygen in the molten steel sharply increase.Sloughing oxygen in the steel certainly will increase the adding of reductor, promptly increases cost and makes too much deoxidation products stay in the molten steel again, forms inclusion.
Traditional technology requires electric furnace steel tapping temperature height, if will use high carbon ferro-chrome, requires electric furnace steel tapping carbon low again, and high-temperature molten steel and carbon low be the major cause that causes the molten steel inclusion many, will directly influence the quality of steel.If carbon or low carbon ferrochromium electric furnace steel tapping carbon can suitably improve but cost will raise in using.
Summary of the invention
The object of the present invention is to provide a kind of method of chromium alloying in gear steel furnace, its operation steps is simple, can prevent the generation of Molten Steel over-oxidation and minimizing deoxidation products effectively, improves the quality of Pinion Steel, reduces production costs.
The object of the present invention is achieved like this: a kind of method of chromium alloying in gear steel furnace, and the technological process of production of this method is: electric furnace-LF refining furnace-continuous casting-steel rolling; Wherein:
In the electrosmelting operation, electric furnace carries out smelting operation by the operation task instruction of producing Pinion Steel, and with addition of molten iron or iron block, the add-on of molten iron or iron block accounts for 35% of the total Intake Quantity of batching in the electric furnace batching;
In mid-term oxidation period of smelting, oxygen decarburization and intensification, its oxygen supply intensity is 1.8m
3/ tmin, and in stove, spray into carbon dust, the spray dosage of carbon dust is a 7.2Kg/ ton steel, the winding-up carbon dust makes slag form foamed as early as possible in stove, to reach dephosphorization and to prevent air-breathing purpose;
Later stage oxidation period of smelting, when eaf tapping point carbon during near 0.10-0.20%, temperature reaches more than 1600 ℃, oxidation sludge in the stove is discharged from the electric furnace fire door, open furnace lid again the 80% usefulness loading hopper or the high-order alloy feed bin of high carbon ferro-chrome weight joined ferrochrome in the stove, this moment, electric furnace was controlled at 1000-1500m with oxygen flow
3/ h requires end point carbon is controlled at 0.10-0.15% according to the carbon content of this steel, taps when temperature reaches 1620 ℃; According to tap what, in tapping process, add deoxygenated alloy and silicomanganese, molten steel is carried out deoxidation and alloying, ferro-titanium adds in the LF refining furnace, adds remaining 20% high carbon ferro-chrome at the LF refining furnace.
The present invention is by alloying technology in the ferrochrome stove, electric furnace adopts height to draw the method for re-blowing in the control of end point carbon, control eaf tapping point carbon content of molten steel is 0.10-0.15%, than former process endpoint carbon content mean height 0.05%, temperature reduces more than 30 ℃ than former technology, can prevent the generation of Molten Steel over-oxidation and minimizing deoxidation products effectively.
The inventive method is applicable to the ultra-high power electric arc furnace of 50 tons and above tonnage, adopts the inventive method production to contain the higher steel grade of chromium, can satisfy the specification of quality of this steel grade fully, accomplishes the end in view.Use this alloying technology to carry out checking repeatedly at electric furnace, to yield of alloy, molten steel inclusion, oxygen nitrogen, analyze, from analyze, draw, adopt this technology and former technology relatively, the internal soundness of steel is improved significantly, and reaches 100% by the standard-required hit rate, press the quality objectives of customer requirements, hit rate reaches more than 80%, and cost of alloy reduces by 22.42 yuan/ton than former technology, has satisfied the service requirements of user to Pinion Steel.Table 1 is a 20GrMnTi chemical Composition Control table, and table 2 is the quality control comparison sheet of steel.
Table 1
Table 2
The present invention is applicable to that mainly electrosmelting contains the higher steel grade of chromium, particularly has significant effect on the cost of control inclusion and reduction steel.Technology of the present invention is simple, and technical threshold is low, be to existing electric furnace smelting process replenish and perfect, the alloy smelting method that has further expanded electric furnace, equipment used is existing installation, is easy to understand and master for those of ordinary skill in the art.
Embodiment
With 70t ton direct current electric arc furnace is that example describes.
A kind of method of chromium alloying in gear steel furnace, its technological process of production is: electric furnace-LF ladle furnace-continuous casting-steel rolling; Wherein:
In the electrosmelting operation, electric furnace carries out smelting operation by the operation task instruction of producing Pinion Steel, in electric furnace batching with addition of molten iron or iron block, the add-on of molten iron or iron block accounts for 35% of the total Intake Quantity of batching, be equipped with 15% direct-reduced iron again if having ready conditions, total Intake Quantity is controlled at about 85 tons, and lime adding amount is every stove 6500kg, the every stove add-on of rhombspar is 1800kg, adds in the first blue material.
Adopt high tap position to send electricity at the electrosmelting initial stage, keeping its strength of current is 70-90kA, so that shorten the steel scrap solution time as far as possible, and is equipped with the carbon-oxygen gun oxygen blast and fluxes, and its oxygen supply intensity is 1.2m
3/ tmin.
In mid-term oxidation period of electrosmelting, oxygen decarburization and intensification, its oxygen supply intensity is 1.8m
3/ tmin, and in stove, spray into carbon dust, the spray dosage of carbon dust is a 7.2Kg/ ton steel, the winding-up carbon dust makes slag form foamed as early as possible in stove, to reach dephosphorization and to prevent air-breathing purpose.
Later stage oxidation period of smelting, when eaf tapping point carbon during near 0.10-0.20%, temperature reaches more than 1600 ℃, oxidation sludge in the stove is discharged from the electric furnace fire door, opening furnace lid again joins the 80% usefulness loading hopper or the high-order alloy feed bin of high carbon ferro-chrome total amount in the stove with ferrochrome, can make molten steel increase the carbon of 0.05-0.08% after high carbon ferro-chrome adds in the stove, this moment, electric furnace was controlled at 1000-1500m with oxygen flow
3/ h cooperates to top of the slag spray carbon, and making foamed slag carries out suitable re-blowing, stirring, uniform temperature, requires end point carbon is controlled at 0.10-0.15% according to the carbon content of this steel, taps when temperature reaches 1620 ℃; According to tap what, in tapping process, add a certain amount of deoxygenated alloy and silicomanganese, molten steel is carried out deoxidation and alloying.For the add-on of deoxygenated alloy and silicomanganese, those skilled in the art can calculate voluntarily according to equipment and processing condition.Ferro-titanium adds in refining furnace, and remaining 20% high carbon ferro-chrome is added in refining furnace.
Claims (2)
1. method of chromium alloying in gear steel furnace, it is characterized in that: the technological process of production of this method is: electric furnace-LF refining furnace-continuous casting-steel rolling; Wherein:
In the electrosmelting operation, electric furnace carries out smelting operation by the operation task instruction of producing Pinion Steel, and with addition of molten iron or iron block, the add-on of molten iron or iron block accounts for 35% of the total Intake Quantity of batching in the electric furnace batching;
In mid-term oxidation period of smelting, oxygen decarburization and intensification, its oxygen supply intensity is 1.8m
3/ tmin, and in stove, spray into carbon dust, the spray dosage of carbon dust is a 7.2Kg/ ton steel, the winding-up carbon dust makes slag form foamed as early as possible in stove, to reach dephosphorization and to prevent air-breathing purpose;
Later stage oxidation period of smelting, when eaf tapping point carbon during near 0.10-0.20%, temperature reaches more than 1600 ℃, oxidation sludge in the stove is discharged from the electric furnace fire door, open furnace lid again the 80% usefulness loading hopper or the high-order alloy feed bin of high carbon ferro-chrome weight joined ferrochrome in the stove, this moment, electric furnace was controlled at 1000-1500m with oxygen flow
3/ h requires end point carbon is controlled at 0.10-0.15% according to the carbon content of this steel, taps when temperature reaches 1620 ℃; According to tap what, in tapping process, add deoxygenated alloy and silicomanganese, molten steel is carried out deoxidation and alloying, ferro-titanium adds in the LF refining furnace, adds remaining 20% high carbon ferro-chrome at the LF refining furnace.
2. method of chromium alloying in gear steel furnace according to claim 1 is characterized in that: adopt high tap position to send electricity at the smelting initial stage, keeping its strength of current is 70-90kA, and is equipped with the carbon-oxygen gun oxygen blast and fluxes, and its oxygen supply intensity is 1.2m
3/ tmin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101135522A CN101709350B (en) | 2009-12-03 | 2009-12-03 | Method of chromium alloying in gear steel furnace |
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| CN2009101135522A CN101709350B (en) | 2009-12-03 | 2009-12-03 | Method of chromium alloying in gear steel furnace |
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| CN101709350A CN101709350A (en) | 2010-05-19 |
| CN101709350B true CN101709350B (en) | 2011-10-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102649988A (en) * | 2011-02-25 | 2012-08-29 | 新疆八一钢铁股份有限公司 | Method for smelting 20CrMoA sucker rod steel |
| CN103386470A (en) * | 2013-08-06 | 2013-11-13 | 武汉重工铸锻有限责任公司 | Method for producing large-sized capless steel ingot by using vacuum pouring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5595613A (en) * | 1994-03-09 | 1997-01-21 | Nissan Motor Co., Ltd. | Steel for gear, gear superior in strength of tooth surface and method for producing same |
| CN101250666A (en) * | 2008-03-26 | 2008-08-27 | 江阴市宏晟特钢有限公司 | Wind electric gear steel and manufacture method thereof |
| CN101255531A (en) * | 2008-03-26 | 2008-09-03 | 莱芜钢铁股份有限公司 | Production method of low-Ti pinion steel |
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- 2009-12-03 CN CN2009101135522A patent/CN101709350B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5595613A (en) * | 1994-03-09 | 1997-01-21 | Nissan Motor Co., Ltd. | Steel for gear, gear superior in strength of tooth surface and method for producing same |
| CN101250666A (en) * | 2008-03-26 | 2008-08-27 | 江阴市宏晟特钢有限公司 | Wind electric gear steel and manufacture method thereof |
| CN101255531A (en) * | 2008-03-26 | 2008-09-03 | 莱芜钢铁股份有限公司 | Production method of low-Ti pinion steel |
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