CN103361575A - Continuously cast bloom for low-carbon steel wire and preparation method thereof - Google Patents
Continuously cast bloom for low-carbon steel wire and preparation method thereof Download PDFInfo
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- CN103361575A CN103361575A CN2013102828746A CN201310282874A CN103361575A CN 103361575 A CN103361575 A CN 103361575A CN 2013102828746 A CN2013102828746 A CN 2013102828746A CN 201310282874 A CN201310282874 A CN 201310282874A CN 103361575 A CN103361575 A CN 103361575A
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Abstract
The invention relates to a continuously cast bloom for a low-carbon steel wire and a preparation method thereof. The continuously cast bloom comprises the components by weight percent: 0.07-0.12% of carbon, 0.15-0.35% of silicon, 1.50-1.70% of manganese, no more than 0.015% of phosphorus, no more than 0.008% of sulphur, no more than 0.10% of chromium, no more than 0.15% of nickel, no more than 0.10% of copper, 0.30-0.40% of molybdenum, 0.04-0.12% of titanium, 0.002-0.006% of boron, no more than 0.015% of aluminum, the balance of ferrum and inevitable impurities. The preparation method comprises the following steps: firstly, smelting in an electric furnace, then refining outside an LF (Ladle Furnace); carrying out VD (vacuum distillation) vacuum degassing; finally carrying out continuous casting, wherein the tapping temperature of the electric furnace is 1650-1670 DEG C; the carbon steel content of the electric furnace is smaller than or equal to 0.04%; the phosphorus content of the discharged steel is smaller than or equal to 0.006%. The continuously cast bloom disclosed by the invention is high in ductility and simple in preparation method.
Description
Technical field
The invention belongs to continuously cast bloom and preparation field thereof, particularly a kind of low-carbon welding wire steel continuously cast bloom and preparation method thereof.
Background technology
Fast development along with China's gas shield welding technology; the consumption of gas protecting welding wire increases year by year; domestic market demand is very large; gas protecting welding wire requires to have preferably arc stability and higher Weld Performance when welding, therefore be widely used in pressurized vessel, electric power, automobile and all kinds of machinery manufacturing industry.
Shielded welding is to utilize gas as the electric arc medium and protect electric arc and the electric-arc welding of welding zone.Which type of performance gas protecting welding wire has is directly connected to whole welded over-all properties and safety, for example mechanical property, resistance to elevated temperatures, creep-resistant property and welding technological properties.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low-carbon welding wire steel continuously cast bloom and production method thereof, and this continuously cast bloom unit elongation is high, and the preparation method is simple.
A kind of low-carbon welding wire steel continuously cast bloom of the present invention, its composition comprises by weight percentage:
Carbon 0.07-0.12%, silicon 0.15-0.35%, manganese 1.50-1.70%, phosphorus≤0.015%, sulphur≤0.008%, chromium≤0.10%, nickel≤0.15%, copper≤0.10%, molybdenum 0.30-0.40%, titanium 0.04-0.12%, boron 0.002-0.006%, aluminium≤0.015%, all the other are iron and inevitable impurity.
A kind of low-carbon welding wire steel of the present invention preparation method of continuously cast bloom comprises:
Advanced electrosmelting then in the external refining of LF ladle, then carries out the VD vacuum outgas, carries out at last continuous casting and gets final product; Wherein electric furnace steel tapping temperature 1650-1670 ℃, electric furnace steel tapping carbon content≤0.04%, tapping phosphorus content≤0.006%.
Hot metal ratio is 50-60% in the described electrosmelting.
The bull ladle temperature is 1663-1673 ℃ (continuous casting is opened and watered stove 1693-1703 ℃) in the external refining of described LF ladle, white slag hold-time 〉=15min.
High vacuum in the described VD vacuum outgas (≤250Pa) hold-time 8～10min, soft blow argon time 〉=10min, 1583-1593 ℃ of VD bull ladle temperature (continuous casting is opened and watered stove 1613-1623 ℃).
The superheating temperature of continuous casting station is 30-45 ℃ in the described continuous casting, and pulling rate is 2-2.5m/min.
Slag steel, briquetting ban use of among the present invention, and steel scrap control non-ferrous metal and contain sneaking into of Cu, Cr, Ni, As, Sn, Pb, Sb, Bi element adopts the one-level molten iron, hot metal ratio 50-60%;
Low-carbon welding wire steel of the present invention is controlled 1660 ± 10 ℃ with (1) electric furnace among the preparation method of continuously cast bloom, end point carbon control≤0.04%, terminal point phosphorus control≤0.006%, tapping temperature; (2) LF refining, the control of C content, white slag maintenance 〉=15min; Arc-covering slag operation; Galvanization is controlled argon flow amount, must not be exposed molten steel; It is for subsequent use to prepare spherical electrolytic manganese; Carry out top of the slag deoxidation with calcium carbide; (3) VD vacuum outgas, [H]≤2ppm, [N]≤58ppm, high vacuum hold-time 8-10min, broken empty rear feeding FeTi70 line, adding FeB20 alloy, soft blow Ar time 〉=10min; (4) continuous casting, in assure standby, connect and to water 30-45 ℃ of stove superheating temperature, the cast of constant pulling rate, whole process protection cast.
Beneficial effect:
The present invention can reduce inclusion size, suitably controls the amount of inclusions and rank, can improve again the recovery rate of the element such as Ti, B in the steel.Bring into play simultaneously the dual function of Ti crystal grain thinning and precipitation strength in steel, improve the intensity of steel, improve the toughness of steel.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
Advanced electrosmelting then in the external refining of LF ladle, then carries out the VD vacuum outgas, carries out at last continuous casting and gets final product; Wherein the electric furnace steel tapping temperature is 1650 ℃, electric furnace steel tapping carbon content 0.04%, tapping phosphorus content 0.006%;
Hot metal ratio is 50% in the described electrosmelting.
The bull ladle temperature is 1665 ℃ (continuous casting is opened and watered 1700 ℃ in stove) in the external refining of described LF ladle, white slag hold-time 20min.
High vacuum in the described VD vacuum outgas (≤250Pa) hold-time 8min, soft blow argon time 10min, 1590 ℃ of VD bull ladle temperature (continuous casting is opened and watered 1620 ℃ in stove);
The superheating temperature of continuous casting station is 45 ℃ in the described continuous casting, and pulling rate is 2m/min.
The gained low-carbon welding wire steel comprises by weight percentage with the composition of continuously cast bloom:
Carbon 0.07%, silicon 0.15%, manganese 1.50%, phosphorus 0.012%, sulphur 0.008%, chromium 0.10%, nickel 0.15%, copper 0.10%, molybdenum 0.35%, titanium 0.05%, boron 0.003%, aluminium 0.015%, all the other are iron and inevitable impurity.
Embodiment 2
Advanced electrosmelting then in the external refining of LF ladle, then carries out the VD vacuum outgas, carries out at last continuous casting and gets final product; Wherein the electric furnace steel tapping temperature is 1660 ℃, electric furnace steel tapping carbon content 0.03%, tapping phosphorus content 0.005%;
Hot metal ratio is 60% in the described electrosmelting.
The bull ladle temperature is 1670 ℃ (continuous casting is opened and watered 1698 ℃ in stove) in the external refining of described LF ladle, white slag hold-time 15min.
High vacuum in the described VD vacuum outgas (≤250Pa) hold-time 10min, soft blow argon time 15min, 1583 ℃ of VD bull ladle temperature (continuous casting is opened and watered 1613 ℃ in stove);
The superheating temperature of continuous casting station is 30 ℃ in the described continuous casting, and pulling rate is 2.5m/min.
The gained low-carbon welding wire steel comprises by weight percentage with the composition of continuously cast bloom:
Carbon 0.08%, silicon 0.20%, manganese 1.60%, phosphorus 0.015%, sulphur 0.007%, chromium 0.08%, nickel 0.12%, copper 0.08%, molybdenum 0.30%, titanium 0.08%, boron 0.005%, aluminium 0.010%, all the other are iron and inevitable impurity.
Claims (6)
1. low-carbon welding wire steel continuously cast bloom, its composition comprises by weight percentage:
Carbon 0.07-0.12%, silicon 0.15-0.35%, manganese 1.50-1.70%, phosphorus≤0.015%, sulphur≤0.008%, chromium≤0.10%, nickel≤0.15%, copper≤0.10%, molybdenum 0.30-0.40%, titanium 0.04-0.12%, boron 0.002-0.006%, aluminium≤0.015%, all the other are iron and inevitable impurity.
2. a kind of low-carbon welding wire steel as claimed in claim 1 comprises with the preparation method of continuously cast bloom:
Advanced electrosmelting then in the external refining of LF ladle, then carries out the VD vacuum outgas, carries out at last continuous casting and gets final product; Wherein electric furnace steel tapping temperature 1650-1670 ℃, electric furnace steel tapping carbon content≤0.04%, tapping phosphorus content≤0.006%.
3. a kind of low-carbon welding wire steel according to claim 2 is with the preparation method of continuously cast bloom, and it is characterized in that: hot metal ratio is 50-60% in the described electrosmelting.
4. a kind of low-carbon welding wire steel according to claim 2 is with the preparation method of continuously cast bloom, and it is characterized in that: the bull ladle temperature is 1663-1673 ℃ in the external refining of described LF ladle, and continuous casting is opened and watered stove 1693-1703 ℃, white slag hold-time 〉=15min.
5. a kind of low-carbon welding wire steel according to claim 2 is with the preparation method of continuously cast bloom, it is characterized in that: high vacuum hold-time 8～10min in the described VD vacuum outgas, soft blow argon time 〉=10min, 1583-1593 ℃ of VD bull ladle temperature, continuous casting is opened and is watered stove 1613-1623 ℃, and described high vacuum is≤250Pa.
6. a kind of low-carbon welding wire steel according to claim 2 is with the preparation method of continuously cast bloom, and it is characterized in that: the superheating temperature of continuous casting station is 30-45 ℃ in the described continuous casting, and pulling rate is 2-2.5m/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014948A (en) * | 2013-12-15 | 2014-09-03 | 许祖泽 | Atmosphere-corrosion-resistant iron-based alloy and welding wire without copper plating |
| CN105132621A (en) * | 2015-09-28 | 2015-12-09 | 南京钢铁股份有限公司 | Smelting process for steel for low-silicon aluminum steel-free welding wire |
| CN109576577A (en) * | 2018-11-22 | 2019-04-05 | 湖南华菱湘潭钢铁有限公司 | The production method of II steel of atmospheric corrosion resistance welding wire TH550-NQ- |
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| JP2005023429A (en) * | 2004-10-20 | 2005-01-27 | Jfe Steel Kk | High toughness uoe steel pipe for use at low temperature |
| CN101543838A (en) * | 2009-05-15 | 2009-09-30 | 首钢总公司 | Method for manufacturing steel wire rod for pipe line steel submerged arc welding wire |
| CN102161139A (en) * | 2010-12-13 | 2011-08-24 | 首钢总公司 | Production method for manufacturing steel wire rod for X80 pipe line steel submerged arc welding wire |
| CN102383049A (en) * | 2011-11-21 | 2012-03-21 | 中国石油集团渤海石油装备制造有限公司 | Method for manufacturing low-cost high-toughness X70 steel spiral submerged arc welded pipe |
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2013
- 2013-07-04 CN CN2013102828746A patent/CN103361575A/en active Pending
Patent Citations (4)
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| JP2005023429A (en) * | 2004-10-20 | 2005-01-27 | Jfe Steel Kk | High toughness uoe steel pipe for use at low temperature |
| CN101543838A (en) * | 2009-05-15 | 2009-09-30 | 首钢总公司 | Method for manufacturing steel wire rod for pipe line steel submerged arc welding wire |
| CN102161139A (en) * | 2010-12-13 | 2011-08-24 | 首钢总公司 | Production method for manufacturing steel wire rod for X80 pipe line steel submerged arc welding wire |
| CN102383049A (en) * | 2011-11-21 | 2012-03-21 | 中国石油集团渤海石油装备制造有限公司 | Method for manufacturing low-cost high-toughness X70 steel spiral submerged arc welded pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014948A (en) * | 2013-12-15 | 2014-09-03 | 许祖泽 | Atmosphere-corrosion-resistant iron-based alloy and welding wire without copper plating |
| CN104014948B (en) * | 2013-12-15 | 2015-12-09 | 许祖泽 | A kind of atmospheric corrosion resistance ferrous alloy and without copper plating soldering wire |
| CN105132621A (en) * | 2015-09-28 | 2015-12-09 | 南京钢铁股份有限公司 | Smelting process for steel for low-silicon aluminum steel-free welding wire |
| CN105132621B (en) * | 2015-09-28 | 2017-05-24 | 南京钢铁股份有限公司 | Smelting process for steel for low-silicon aluminum steel-free welding wire |
| CN109576577A (en) * | 2018-11-22 | 2019-04-05 | 湖南华菱湘潭钢铁有限公司 | The production method of II steel of atmospheric corrosion resistance welding wire TH550-NQ- |
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Application publication date: 20131023 |