CN103255354A - Steel for composite microalloying welding wire and preparation method thereof - Google Patents
Steel for composite microalloying welding wire and preparation method thereof Download PDFInfo
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Abstract
The invention provides steel for a composite microalloying welding wire and a preparation method thereof. The steel is characterized by comprising the following chemical components in percentage by weight: no less than 0.06% and no more than 0.15% of C, no less than 0.81% and no more than 1.15% of Si, no less than 1.40% and no more than 1.85% of Mn, no less than 0.08% and no more than 0.15% of Ni, no less than 0.05% and no more than 0.15% of Cr, no less than 0.05% and no more than 0.15% of Mo, no less than 0.008% and no more than 0.012% of Ti, no less than 0.006% and no more than 0.030% of V, no less than 0.015% and no more than 0.025% of Nb, no less than 0.0005% and no more than 0.0030% of B, no more than 0.025% of S, no more than 0.025% of P, no more than 0.005% of O and the balance of Fe. The preparation method comprises the following steps of converting, ladle bottom argon blowing, LF refinement, fully-protected continuous casting, hot rolling and STELMOR cooling. The composite alloying provided by the invention is beneficial to refine molten drops, stabilize current and enhance the weld quality, and is beneficial to enhance the weld strength.
Description
Technical field
The invention belongs to field of iron and steel, specially refer to a kind of welding wire steel that adopts multiple alloying element composite alloying.
Background technology
The titanium master alloy welding wire is the main raw of present shielded welding, and the span of control of this class steel general requirement Ti is 0.10%-
In 0.25%, mainly there are two problems in this class steel grade at present: the one, the titanium master alloy welding wire steel when continuous casting the easy oxidation of titanium, nitrogenize with TiO
2, the TiN particle form enters covering slag and causes the covering slag mis-behave, causes the continuous casting billet quality problem; The 2nd, alloying element is at CO during welding
2Also there is oxidation under the atmosphere, if alloy quantity not sufficient, deoxidation is insufficient, to cause producing in the weld seam that pore, particularly molten drop are inhomogeneous causes that welding current fluctuation is big, the molten drop thickness is inhomogeneous, influence welding quality, therefore, the titanium alloy element is generally all controlled below 0.12% in the titanium master alloy welding wire steel at present, and this causes, and titanium elements contains quantity not sufficient in the steel, and thin crystalline substance, the refinement weldering of welding titanium elements in the use dripped, the effect of stable welding current weakens; Also have in the prior art the technology of titanium content control in higher level, mainly concentrate on aspects such as full guard casting, optimization covering slag performance and welding atmosphere control, the control of welding protection slag, the technology of this respect can be used as the remedial measures after titanium content exceeds standard; At present, need be from the problem of material self, research and develop a kind of new steel grade, introduce the element that multiple and Ti element play identical or approximate effect and carry out combined microalloying, namely bring into play the effect of aspects such as these micro alloying elements thin crystalline substance, refinement weldering when welding are dripped, steady current, raising weldquality, again titanium content is reduced to certain content range, reduces oxidation, the nitrogenize problem of control titanium elements in the casting process of the steel that causes because of the titanium content height and the welding process; Prior art mainly realizes by continuous casting protection casting at the oxidation of high titanium welding wire steel casting process control titanium elements, but the oxygen that fuses in the steel and nitrogen can't protect casting to solve by continuous casting to oxidation and the nitrogenize problem of titanium in the steel; The problem of control welding process alloying element oxidation mainly is by the gas shield welding, but adopts CO at present more
2Atmosphere protection still exists the titanium alloy element by CO
2The problem of oxidation and the nitrogenize of welding process secondary; Therefore, need by combined microalloying, reduce the titanium alloy constituent content from titanium master alloy solder wire material itself at present, namely develop the novel material of one kind of multiple alloying element combined microalloyings.
Summary of the invention
The purpose of this invention is to provide a kind of combined microalloying welding wire steel novel material, namely introduce the element that multiple and Ti element play identical or approximate effect on the basis of existing titanium master alloy steel and carry out combined microalloying, reduce titanium elements content, thus reduce and the control steel in continuous casting and welding use because the oxidation of titanium elements, the variety of issue that nitrogenize causes.
The objective of the invention is to realize by following technical proposal:
A kind of combined microalloying welding wire steel is characterized in that the chemical ingredients of steel is (weight percent): 0.06%≤C≤0.15%, 0.81%≤Si≤1.15%, 1.40%≤Mn≤1.85%, 0.08%≤Ni≤0.15%, 0.05%≤Cr≤0.15%, 0.05%≤Mo≤0.15%, 0.008%≤Ti≤0.012%, 0.006%≤V≤0.030%, 0.015%≤Nb≤0.025%, 0.0005%≤B≤0.0030%, S≤0.025%, P≤0.025%, O≤0.005%, surplus are Fe.
Being characterized as of the production process of combined microalloying welding wire steel wire rod of the present invention: adopt converter-steel ladle bottom argon blowing-LF refining-full guard continuous casting-hot rolling-STELMOR to cool off preparation flow, concrete steps are characterized as:
A) oxygen converter steelmaking: the tapping temperature target is 1650-1680 ℃; Converter smelting endpoint composition quality percentage ratio is controlled to be: C 0.05%-0.06%, and P≤0.010%, S≤0.020%, surplus is iron; The dual alkalinity control of converter smelting endpoint slag is at 3.5-4.0, and FeO is lower than 10% in the slag; The converter tapping process adds ferrosilicon in the ladle and ferromanganese carries out pre-deoxidation and silicomanganese is element alloyed, the lime that adds slag weight 5-8% in the ladle improves that basicity of slag returns sulphur, rephosphorization is controlled, the target component mass percent of ladle is: C 0.05%-0.07%, Si 0.81%-1.15%, Mn 1.40%-1.85%, S≤0.020%, P≤0.020%, surplus is iron.
B) ladle argon-blown: in the converter tapping process ladle is carried out BOTTOM ARGON BLOWING, the Argon pressure-controlling is at 0.4-0.8MPa, and it is target in the 100mm-150mm scope that pressure is regulated with ladle liquid level " bore hole " diameter.
C) LF refining: Argon after double-station LF furnace refining, ladle put in place, Argon pressure-controlling are at 0.5-0.8MPa, and it is target in scope that pressure is regulated with ladle liquid level " bore hole " diameter 140mm-150mm; Adopt calcium carbide reduction ladle slag, 25-30 minute white slag hold-time; Adding calcium carbide, white slag keep adding ferronickel, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotianium and ferro-boron successively after 10 minutes, adjust alloying element content to target zone: 0.08%≤Ni≤0.15%, 0.05%≤Cr≤0.15%, 0.05%≤Mo≤0.15%, 0.006%≤V≤0.030%, 0.015%≤Nb≤0.025%, 0.008%≤Ti≤0.012%, 0.0005%≤B≤0.0030%, S≤0.025%, P≤0.025%, O≤0.005%; The LF refining finishes preceding 5 minutes, adopts the soft blow argon, and the Argon pressure-controlling is at 0.4-0.5MPa, and it is target that pressure is regulated with ladle liquid level " bore hole " diameter 40mm-50mm.
D) casting process: realize the full guard casting, comprising: wrap long nozzle argon envelope protection casting greatly, tundish adopts the low-carbon (LC) alkaline covering agent to cover, and crystallizer adopts submerged nozzle, adopts covering slag in the crystallizer; The control of casting cycle tundish molten steel overheat is at 25-30 ℃.
E) course of hot rolling: 1000-1050 ℃ of process furnace tapping temperature, 930-960 ℃ of breaking down temperature, 900-920 ℃ of finish rolling temperature in, 1000-1040 ℃ of finish rolling temperature out, laying temperature 830-850 ℃.
F) STELMOR cooling.
The present invention compares with steel with existing titanium master alloy welding wire, by introducing V, Nb, B, Cr, alloying elements such as Mo carry out combined microalloying, reduce the add-on of Ti element, V, Nb, the same effect of playing crystal grain thinning raising toughness with titanium of Mo element, Cr and B can reduce separating out of titanium nitride, in addition, the adding of these elements has reduced steel grade oxygen, nitrogen content, particularly these elements continuously cast bloom solidify and the layer process of setting in, form other nitride of micro/nano level, and these elements are separated out the difference on opportunity, the nitride of these elements can not merge mutually grows up, thereby play the effect of thin crystalline substance and fine and closely wovenization of welding drop, and the content of titanium is reduced to 0.008%-0.012%, has eliminated the titaniferous steel alloy at continuous casting and has welded use because excessive Ti oxidation, the problem that nitrogenize occurs; In addition, the content of micro alloying element is low, has substituted alloying elements such as Ti, Ni a large amount of in traditional titanium master alloy welding wire steel, Mo, has reduced the production cost of steel.
Compared with prior art, adopt advantage of the present invention as follows:
1) the present invention proposes to adopt Nb, V, B, Ti, Cr etc. to carry out combined microalloying, these elements all have nitride, crystal grain thinning and the desoxydatoin of formation, substitute a large amount of titanium elements in the titanium master alloy steel, namely brought into play the effect of aspects such as these micro alloying elements thin crystalline substance, refinement weldering when welding are dripped, steady current, raising weldquality, again titanium content is reduced to certain content range, has fundamentally solved the quality problems that titanium elements excessive oxidation, nitrogenize cause in the casting process of the steel that causes because of the titanium content height and the welding process.
2) the alloy total amount consumed of the multielement combined microalloying of the present invention's proposition is lacked than using single Ti alloying to produce the titanium master alloy welding wire steel; particularly full guard casting after fully deoxidation, the alloying before the alloying; control the oxidation of alloying element, reduced production cost.
3) among the preparation method of the multielement combined microalloying steel that proposes of the present invention without aluminium deoxidation, molten steel is handled without calcium, not only saved cost, and steel grade does not have large-sized aluminum oxide, calcium aluminate inclusion, the important factor that molten steel splashed when these large-sized inclusions caused welding exactly, electric current was steady when composite alloying welding wire steel therefore of the present invention welded, and metal splashes few.
Embodiment
The invention will be further elaborated below in conjunction with embodiment; Embodiment only is used for explanation the present invention, rather than limits the present invention by any way.
Embodiment 1
Adopt 100 tons of converter smeltings, adding amount of scrap steel 10%, the smelting endpoint composition quality is: C 0.05%, and P 0.008%, and S 0.020%, and the slag specimen analysis is got in deslagging before the tapping, and the dual alkalinity of smelting finishing slag is 3.6, and FeO 9.5% in the slag, and the converter tapping temperature is 1650 ℃; About 30 ton hours of molten steel in the ladle, add ferrosilicon in the ladle, ferromanganese carries out pre-deoxidation and silicomanganeseization, add the basicity that 150kg lime improves ladle slag when adding alloy in the ladle and return sulphur, rephosphorization control (by the add-ons of the about 2 tons of calculating lime of slag weight in 100 tons of ladles, lime adding amount be in the ladle slag weight 7.5%), the tapping back at ladle sampling analysis composition is: C 0.06%, and Si 0.91%%, and Mn 1.45%, S 0.018%, and P 0.010%; Enter Argon station Argon deslagging after the tapping, the Argon pressure-controlling is at 0.5MPa, ladle liquid level " bore hole " diameter 140mm, Argon after 5 minutes ladle enter the double-station LF furnace refining, first Argon is continued in the ladle back that puts in place, and the Argon pressure-controlling is at 0.6MPa, ladle liquid level " bore hole " diameter 145mm; In ladle, add calcium carbide, ladle slag is thoroughly reduced make white slag, 30 minutes white slag hold-times; Adding calcium carbide, white slag keep adding ferronickel, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotianium and ferro-boron successively after 10 minutes, adjust alloying element content to target zone: Ni 0.15%, Cr 0.15%, and Mo 0.15%, and V 0.030%, Nb 0.015%, Ti 0.008%, and B 0.0005%, detrimental impurity element S 0.016%, P 0.020%, and O 0.005%; The LF refining finishes preceding 5 minutes, adopts the soft blow argon, and the Argon pressure-controlling is at 0.4MPa, and it is target that pressure is regulated with ladle liquid level " bore hole " diameter 45mm; Refining finishes to enter into continuous casting working procedure; continuous casting tundish capacity 45t; adopt the protection of big bag long nozzle argon envelope; tundish adopts the low-carbon (LC) alkaline covering agent; crystallizer adopts submerged nozzle; crystallizer adopts the no carburetting full guard casting of measure realization such as low carbon protective slag, and strand is of a size of the 150mm square billet, casting speed 2.4m/min; the control of casting cycle tundish molten steel overheat is at 25-30 ℃; be the tundish molten steel temperature in the 1530-1540 temperature range, continuous casting square billet enters process furnace by hot delivery and hot charging, 1020 ℃ of process furnace tapping temperatures; 940 ℃ of breaking down temperature; 910 ℃ of finish rolling temperature ins, 1020 ℃ of finish rolling temperature outs, 830 ℃ of laying temperatures; obtain wire rod through the stelmor cooling then; get the finished product and carry out spectral component analysis: C 0.06%, Si 0.81%, and Mn 1.40%; Ni 0.15%; Cr 0.15%, and Mo 0.15%, and V 0.030%; Nb 0.015%; Ti 0.008%, and B 0.0005%, detrimental impurity element S 0.016%; P 0.020%, and O 0.005%.
Facts have proved: multi-element composite micro-alloying steel of the present invention covering slag usage quantity in casting process is normal; do not crust; sex change phenomenons such as knot fish; the no accumulated slag in continuously cast bloom surface; quality problems such as pit; the oxidation of proof Ti in casting process; the nitrogenize problem is controlled; alloy welding wire molten drop in use is tiny; fluctuation of current is little; the layer pore-free; the non-oxidation during welding of proof alloy welding wire; the nitrogenize problem occurs; compare present titanium master alloy steel, overcome casting process and a large amount of oxidations of the welding excessive Ti element of use; a series of problems that nitrogenize causes.
Embodiment 2
Adopt 200 tons of converter smeltings, 178 tons of molten iron Intake Quantitys, 23 tons of steel scrap Intake Quantitys, the smelting endpoint composition quality is: C 0.06%, P 0.009%, S 0.018%, the slag specimen analysis is got in deslagging before the tapping, and the dual alkalinity of smelting finishing slag is 3.8, and FeO 9.5% in the slag, the converter tapping temperature is 1660 ℃, molten steel 60 ton hours in the ladle add ferrosilicon in ladle, ferromanganese carries out pre-deoxidation and silicomanganeseization, adds the basicity that 200kg lime improves ladle slag when adding alloy in the ladle and returns sulphur, rephosphorization control, (by the about 3 tons of add-ons of calculating lime of slag weight in 200 tons of ladles, lime adding amount be in the ladle slag weight 6.7%); The tapping back at ladle sampling analysis composition is: C 0.07%, and Si 0.95%%, and Mn 1.75%, and S 0.016%, and P 0.012%; Enter Argon station Argon deslagging after the tapping, the Argon pressure-controlling is at 0.8MPa, ladle liquid level " bore hole " diameter 140mm, Argon after 5 minutes ladle enter the double-station LF furnace refining, first Argon is continued in the ladle back that puts in place, and the Argon pressure-controlling is at 0.7MPa, ladle liquid level " bore hole " diameter 145mm; In ladle, add calcium carbide, ladle slag is thoroughly reduced make white slag, 30 minutes white slag hold-times; Adding calcium carbide, white slag keep adding ferronickel, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotianium and ferro-boron successively after 10 minutes, adjust alloying element content to target zone: Ni 0.10%, Cr 0.10%, and Mo 0.10%, and V 0.020%, Nb 0.020%, Ti 0.010%, and B 0.0008%, detrimental impurity element S 0.016%, P 0.018%, and O 0.005%; The LF refining finishes preceding 5 minutes, adopts the soft blow argon, and the Argon pressure-controlling is at 0.5MPa, and it is target that pressure is regulated with ladle liquid level " bore hole " diameter 50mm; Refining finishes to enter into continuous casting working procedure; continuous casting tundish capacity 45t; adopt the protection of big bag long nozzle argon envelope; tundish adopts the low-carbon (LC) alkaline covering agent; crystallizer adopts submerged nozzle; crystallizer adopts the no carburetting full guard casting of measure realization such as low carbon protective slag, and strand is of a size of the 160mm square billet, casting speed 2.35m/min; the control of casting cycle tundish molten steel overheat is at 30 ℃; be the tundish molten steel temperature at 1542 ℃, continuous casting square billet enters process furnace by hot delivery and hot charging, 1050 ℃ of process furnace tapping temperatures; 950 ℃ of breaking down temperature; 915 ℃ of finish rolling temperature ins, 1030 ℃ of finish rolling temperature outs, 845 ℃ of laying temperatures; obtain wire rod through the stelmor cooling then; get the finished product and carry out spectral component analysis: C 0.07%, Si 0.95%%, and Mn 1.75%; Ni 0.10%; Cr 0.10%, and Mo 0.10%, and V 0.020%; Nb 0.020%; Ti 0.010%, and B 0.0008%, and S 0.016%; P 0.018%, and O 0.005%.
Facts have proved: multi-element composite micro-alloying steel of the present invention covering slag usage quantity in casting process is normal; do not crust; sex change phenomenons such as knot fish; the no accumulated slag in continuously cast bloom surface; quality problems such as pit; the oxidation of proof Ti in casting process; the nitrogenize problem is controlled; alloy welding wire molten drop in use is tiny; fluctuation of current is little; the layer pore-free; the non-oxidation during welding of proof alloy welding wire; the nitrogenize problem occurs; compare present titanium master alloy steel, overcome casting process and a large amount of oxidations of the welding excessive Ti element of use; a series of problems that nitrogenize causes.
Embodiment 3
Adopt 250 tons of converter smeltings, 225 tons of molten iron Intake Quantitys, 27 tons of steel scrap Intake Quantitys, the smelting endpoint composition quality is: C 0.06%, P 0.009%, S 0.018%, the slag specimen analysis is got in deslagging before the tapping, the dual alkalinity of smelting finishing slag is 4.0, and FeO 9% in the slag, and the converter tapping temperature is 1680 ℃, in ladle, add ferrosilicon in the tapping process, ferromanganese carries out pre-deoxidation and silicomanganeseization, add the basicity that 260kg lime improves ladle slag when adding alloy in the ladle and return sulphur, rephosphorization control (by the about 3.4 tons of add-ons of calculating lime of slag weight in 250 tons of ladles, lime adding amount be in the ladle slag weight 7%), the tapping back at ladle sampling analysis composition is: C 0.06%, Si 0.95%%, Mn 1.75%, and S 0.016%, and P 0.012%; Enter Argon station Argon deslagging after the tapping, the Argon pressure-controlling is at 0.8MPa, ladle liquid level " bore hole " diameter 145mm, Argon after 5 minutes ladle enter the double-station LF furnace refining, first Argon is continued in the ladle back that puts in place, and the Argon pressure-controlling is at 0.8MPa, ladle liquid level " bore hole " diameter 145mm; In ladle, add calcium carbide, ladle slag is thoroughly reduced make white slag, 30 minutes white slag hold-times; Adding calcium carbide, white slag keep adding ferronickel, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotianium and ferro-boron successively after 10 minutes, adjust alloying element content to target zone: Ni 0.08%, Cr 0.05%, and Mo 0.05%, and V 0.006%, Nb 0.015%, Ti 0.008%, and B 0.0030%, detrimental impurity element S 0.016%, P 0.018%, and O 0.005%; The LF refining finishes preceding 5 minutes, adopts the soft blow argon, and the Argon pressure-controlling is at 0.5MPa, and it is target that pressure is regulated with ladle liquid level " bore hole " diameter 50mm; Refining finishes to enter into continuous casting working procedure, continuous casting tundish capacity 45t, adopt the protection of big bag long nozzle argon envelope, tundish adopts the low-carbon (LC) alkaline covering agent, crystallizer adopts submerged nozzle, crystallizer adopts the no carburetting full guard casting of measure realization such as low carbon protective slag, and strand is of a size of the 160mm square billet, casting speed 2.35m/min, the control of casting cycle tundish molten steel overheat is at 28 ℃, be the tundish molten steel temperature at 1543 ℃, continuous casting square billet enters process furnace by hot delivery and hot charging, 1000 ℃ of process furnace tapping temperatures, 930 ℃ of breaking down temperature, 900 ℃ of finish rolling temperature ins, 1000 ℃ of finish rolling temperature outs, 830 ℃ of laying temperatures, obtain wire rod through the stelmor cooling then, get the finished product and carry out spectral component analysis: C 0.06%, Si 0.95%%, and Mn 1.75%, Ni 0.08%, Cr 0.05%, and Mo 0.05%, and V 0.006%, Nb 0.015%, Ti 0.008%, and B 0.0030%, and S 0.016%, P 0.018%, and O 0.005%; Wire rod is made alloy welding wire through 5 passes of drawing.
Facts have proved: multi-element composite micro-alloying steel of the present invention covering slag usage quantity in casting process is normal; do not crust; sex change phenomenons such as knot fish; the no accumulated slag in continuously cast bloom surface; quality problems such as pit; the oxidation of proof Ti in casting process; the nitrogenize problem is controlled; alloy welding wire molten drop in use is tiny; fluctuation of current is little; the layer pore-free; the non-oxidation during welding of proof alloy welding wire; the nitrogenize problem occurs; compare present titanium master alloy steel, overcome casting process and a large amount of oxidations of the welding excessive Ti element of use; a series of problems that nitrogenize causes.
Claims (2)
1. a combined microalloying welding wire steel is characterized in that the chemical ingredients of steel is (weight percent): 0.06%≤C≤0.15%, 0.81%≤Si≤1.15%, 1.40%≤Mn≤1.85%, 0.08%≤Ni≤0.15%, 0.05%≤Cr≤0.15%, 0.05%≤Mo≤0.15%, 0.008%≤Ti≤0.012%, 0.006%≤V≤0.030%, 0.015%≤Nb≤0.025%, 0.0005%≤B≤0.0030%, S≤0.025%, P≤0.025%, O≤0.005%, surplus are Fe.
2. a kind of combined microalloying welding wire as claimed in claim 1 is characterized in that comprising the steps: with the preparation method of steel
A) oxygen converter steelmaking: the tapping temperature target is 1650-1680 ℃; Converter smelting endpoint composition quality percentage ratio is controlled to be: C 0.05%-0.06%, and P≤0.010%, S≤0.020%, surplus is iron; The dual alkalinity control of converter smelting endpoint slag is at 3.5-4.0, and FeO is lower than 10% in the slag; The converter tapping process adds ferrosilicon in the ladle and ferromanganese carries out pre-deoxidation and silicomanganese is element alloyed, the lime that adds slag weight 5-8% in the ladle improves that basicity of slag returns sulphur, rephosphorization is controlled, the target component mass percent of ladle is: C 0.05%-0.07%, Si 0.81%-1.15%, Mn 1.40%-1.85%, S≤0.020%, P≤0.020%, surplus is iron;
B) ladle argon-blown: in the converter tapping process ladle is carried out BOTTOM ARGON BLOWING, the Argon pressure-controlling is at 0.4-0.8MPa, and it is target in the 100mm-150mm scope that pressure is regulated with ladle liquid level " bore hole " diameter;
C) LF refining: Argon after double-station LF furnace refining, ladle put in place, Argon pressure-controlling are at 0.5-0.8MPa, and it is target in scope that pressure is regulated with ladle liquid level " bore hole " diameter 140mm-150mm; Adopt calcium carbide reduction ladle slag, 25-30 minute white slag hold-time; Adding calcium carbide, white slag keep adding ferronickel, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotianium and ferro-boron successively after 10 minutes, adjust alloying element content to target zone: 0.08%≤Ni≤0.15%, 0.05%≤Cr≤0.15%, 0.05%≤Mo≤0.15%, 0.006%≤V≤0.030%, 0.015%≤Nb≤0.025%, 0.008%≤Ti≤0.012%, 0.0005%≤B≤0.0030%, S≤0.025%, P≤0.025%, O≤0.005%; The LF refining finishes preceding 5 minutes, adopts the soft blow argon, and the Argon pressure-controlling is at 0.4-0.5MPa, and it is target that pressure is regulated with ladle liquid level " bore hole " diameter 40mm-50mm;
D) casting process: realize the full guard casting, comprising: wrap long nozzle argon envelope protection casting greatly, tundish adopts the low-carbon (LC) alkaline covering agent to cover, and crystallizer adopts submerged nozzle, adopts covering slag in the crystallizer; The control of casting cycle tundish molten steel overheat is at 25-30 ℃;
E) course of hot rolling: 1000-1050 ℃ of process furnace tapping temperature, 930-960 ℃ of breaking down temperature, 900-920 ℃ of finish rolling temperature in, 1000-1040 ℃ of finish rolling temperature out, laying temperature 830-850 ℃;
F) STELMOR cooling.
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| CN103436657A (en) * | 2013-08-28 | 2013-12-11 | 中天钢铁集团有限公司 | Welding wire steel smelting process capable of preventing welding spatter |
| CN104831014A (en) * | 2015-03-31 | 2015-08-12 | 青岛钢铁控股集团有限责任公司 | High titanium special welding wire steel smelting method |
| CN106319137A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Control method for total aluminum content of high-titanium steel |
| CN105132804A (en) * | 2015-09-06 | 2015-12-09 | 南京钢铁股份有限公司 | Method for rolling vanadium-titanium welding steel hot-rolled wire rod |
| CN105420601A (en) * | 2015-12-11 | 2016-03-23 | 武汉钢铁(集团)公司 | Production method of high-plasticity steel wire rod for welding |
| CN110343807A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of ER50-6E series low-carbon steel smelting deoxidization technique |
| CN109175786A (en) * | 2018-10-31 | 2019-01-11 | 首钢集团有限公司 | A kind of high-strength weather-proof gas protecting welding wire wire rod |
| CN109440011A (en) * | 2018-12-27 | 2019-03-08 | 攀钢集团江油长城特殊钢有限公司 | A kind of nitrogenous welding wire steel of vacuum induction furnace smelting low-alloy and its smelting process |
| CN111716037A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Method for improving quality of welding wire steel casting blank |
| CN110682028A (en) * | 2019-10-15 | 2020-01-14 | 南京钢铁股份有限公司 | Submerged arc welding wire for refractory steel with yield strength of 420MPa |
| CN111424210A (en) * | 2020-03-31 | 2020-07-17 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolled wire rod for welding wire and production method thereof |
| CN116397159A (en) * | 2022-12-21 | 2023-07-07 | 本钢板材股份有限公司 | Steel H08MnSiCuCrNi II for gas-shielded welding wire and production and preparation method thereof |
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