CN102191426B - Stainless steel wire for welding and method for smelting steel for wire - Google Patents
Stainless steel wire for welding and method for smelting steel for wire Download PDFInfo
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Abstract
The invention relates to a stainless steel wire for welding and a method for smelting steel for wire. The stainless steel wire comprises the following trace elements: 0.003-0.015% of O, 0.005-0.015% of S, more than 0 and not more than 0.005% of Al, more than 0 and not more than 0.003% of B, and more than 0 and not more than 0.2% of Co. The method for smelting the steel for the wire comprises the steps of: 1, adding pretreated molten iron into an oxygen top-blown converter, adding chrome iron and ferronickel alloy according to components in a finished product, and blowing oxygen and decarburizing until the carbon content reaches 0.2-0.3%; 2, adding molten steel into a vacuum oxygen-blown smelting furnace, vacummizing, blowing oxygen, calculating the addition amount of silicon iron when the contents of carbon, oxygen, sulfur, calcium, aluminum, boron and cobalt meet requirements, adding the silicon iron for deoxidation, and adding lime for desulfuration, blowing argon and stirring; and 3, adding molten steel into a ladle refining furnace, replenishing metal chrome and metal nickel according to the contents of chrome and nickel in the finished product until a requirement on the finished product is met, and continuing the process until the weight percentages of the components of oxygen, sulfur, aluminum, calcium, boron and cobalt in the molten steel reach the requirements on the finished product. According to the stainless steel wire for welding, provided by the invention, severe metal splattering during welding is avoided, and the formation of welded lines is good.
Description
Technical field
The present invention relates to a kind of stainless steel for soldering wire rod and wire rod thereof the smelting process of steel.
Background technology
Micro-aerobic, sulphur, aluminium, calcium, boron, cobalt in the stainless steel for soldering wire rod, they mainly show aspects such as welding the time is splashed, formation of weld, weld metal crack susceptibility to the influence of welding.In the existing stainless steel for soldering wire rod standard, do not stipulate content of elements, whole content of elements is groped according to service requirements and steel grade by the manufacturer that produces the stainless steel for soldering wire rod, because trace element is indeterminate with stainless influence to welding, and the steel grade of stainless steel for soldering wire rod is more, determine trace element at the content of concrete steel grade, difficulty is very big.If trace element control is improper in the stainless steel welding material, when welding problems such as metal splashes greatly, formation of weld is bad can appear.The increase of splashing during welding can reduce the deposition coefficient of welding wire, thereby increases the consumption of welding wire and electric energy, reduces welding productivity, and makes the labor condition variation.It is bad that stainless steel weld joint is shaped, and weld seam width inequality is little with the mother metal bonding surface, influences attractive in appearancely, and more important is to influence quality of weld joint.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing stainless steel for soldering wire rod, the invention provides in a kind of welding and avoid the stainless steel for soldering wire rod that metal splashes greatly, formation of weld is bad, the smelting process of a kind of stainless steel for soldering wire rod with steel is provided simultaneously.
The present invention proposes the micronutrient levels span of control in the stainless steel for soldering wire rod, can solve the problem that metal splashes greatly, formation of weld is bad, weld metal crack susceptibility is big in the stainless steel welding.
Surface tension is the pulling force that intermolecular interaction forms in the fluid surface thin layer, and surface tension reduces liquid surface area as best one can.The little person of coefficient of surface tension almost can be soaked into all solids; Coefficient of surface tension is big, keeps spherical substantially.
The molten drop surface tension is big during the stainless steel welding, is difficult for direct transformation and arrives the molten bath, and under the welding current effect, the part molten drop flies to outside the molten bath, and formation is splashed.The molten steel of melting bath surface tension is big during the stainless steel welding, and Molten Steel Flow is poor, and wetting property is bad, makes formation of weld bad.
The surface tension of liquid is relevant with fluid temperature, purity liquid and solute species, thus the micronutrient levels in the stainless steel welding material to when welding molten drop and the surface tension of molten steel material impact is arranged.Wherein element such as oxygen, sulphur reduces surface tension, is surface active element again, and elements such as calcium, aluminium increase surface tension.
Welding also has detrimentally affect to stainless steel to improve the thermoplastic micronutrient boron commonly used of stainless steel, reason is that boron content is higher than at 0.003% o'clock the boron phase (Fe3 (CB), Fe3 (BC) 6, Fe2B) that produces in the steel is separated out along austenite grain boundary, produce hot-short phenomenon, weld metal crack susceptibility is increased.
In addition, the cobalt contents in the stainless steel for soldering wire rod is in the welding process of relevant nuclear power plant equipment, because cobalt has the effect of intercept neutrons, can cause yield of radiation to increase, so in the stainless steel for soldering wire rod of used in nuclear power station cobalt contents is also had requirement.
The present invention has obtained micronutrient levels scope suitable in the stainless steel for soldering wire rod through the stainless steel welding stick with the soldering stainless steel wire production of different micronutrient levelss is tested.
Feature in this stainless steel for soldering wire rod is to have controlled trace element wherein, and the content of micro-oxygen, sulphur, calcium, aluminium, boron and cobalt (weight percentage) is:
O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.005%；
0＜Al≤0.03%； 0＜B≤0.003%； 0＜Co≤0.2%。
This stainless steel for soldering wire rod is applicable to multiple stainless steel for soldering, and the main steel grade that is suitable for has H022Cr21Ni10, H022Cr18Ni12Mo2, H022Cr23Ni13, H022Cr21Ni10Si, H022Cr18Ni12Mo2Si, H022Cr23Ni13Si.
The weight percent of the composition of a kind of stainless steel for soldering wire rod of the present invention is:
0＜C≤0.03% ；0＜Si≤1.00% ； 0＜P≤0.035% ；Cr 18.50-24.00% ；
Ni 9.50-14.00% ；O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.03%
0＜Al≤0.03% ；0＜B≤0.003%； 0＜Co≤0.2%；
All the other are Fe and unavoidable impurities.
Contain molybdenum in H022Cr18Ni12Mo2, the H022Cr18Ni12Mo2Si stainless steel for soldering wire rod,
Be added with molybdenum in the composition of above-mentioned STAINLESS STEEL WIRE, the weight percent of adding is:
Mo 2.00—3.00%。
The weight percent of the composition of another kind of stainless steel for soldering wire rod of the present invention becomes:
0＜C≤0.03% ；0＜Si≤1.00% ； 0＜P≤0.035% ；Cr 18.50-24.00% ；
Ni 9.50-14.00% ；O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.03%
0＜Al≤0.03% ；0＜B≤0.003%； 0＜Co≤0.2%；
Mo 2.00-3.00%; All the other are Fe and unavoidable impurities.
The diameter of this stainless steel for soldering wire rod has many kinds of Φ 5.5mm, Φ 6.0mm, Φ 6.5mm.
This stainless steel for soldering wire rod comprises following sequential steps with the smelting process of steel:
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C≤0.6%; O≤0.003%; S 0.1-0.3%; All the other are Fe and unavoidable impurities.
Composition requirement by chromium in the finished product and nickel adds ferrochrome, Rhometal respectively, molten steel oxygen blast gas 5-6m per ton
3Decarburization becomes molten steel, and carbon content reaches the 0.2-0.3% tapping; (other component content does not require)
IIThe molten steel that carbon content is reached 0.2-0.3% adds in the vacuum oxygen smelting furnace, vacuumizes to reach≤steel oxygen blast 4-5m per ton during 3mbar
3, be evacuated to 0.5-0.8mbar afterwards, again steel oxygen blast 5-6 m per ton
3, the chemical examination composition (owing to contain Ca, Al element in the smelting furnace refractory materials, has impurity such as B, Co, can sneak in the molten steel in steel-making in ferrochrome, the Rhometal.Can add aluminium during conventional steel-making in addition and Ca-Si carries out deoxidization desulfuration, the present invention has cancelled the measure that adds aluminium and Ca-Si in order to control micronutrient levels) when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.010-0.030%； O 0.01-0.03%； S 0.03-0.05% ；
Ca 0-0.002%； Al 0-0.02%； B 0-0.001%； Co 0-0.05%；
Calculate the ferrosilicon add-on by total blowing oxygen quantity in converter and the vacuum smelting furnace with following (1) formula, add the ferrosilicon deoxidation;
Fe-Si amount=1.50 * be blown into total oxygen demand-700 * carbon content (%)-1390 (1)
The unit of silicon steel iron add-on is kg; The unit that is blown into total oxygen demand is m
3
Molten steel per ton adds lime 11-22 kg desulfurization again, presses 50-100 m
3After/minute blowing argon gas 15min ± 3 min stirred, steel water oxygen and sulphur reached following requirement tapping:
O 0.003-0.015%；S 0.005-0.015%；
IIIMolten steel joins in the ladle refining furnace, add chromium metal respectively and metallic nickel reaches the finished product requirement by the requirement of chromium, nickel in the finished product, add ferrosilicon according to finished product Si content and reach the finished product requirement, molten steel per ton adds boron steel 0.1-0.3kg/t, blowing argon gas then, flow control is at 50-100 m
3/ min, churning time＞3min and molten steel are exposed, the chemical examination molten steel composition, and the weight percent of oxygen, sulphur, aluminium, calcium, boron and cobalt reaches following value, reaches the requirement that the present invention controls trace element:
O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.005%；
0＜Al≤0.03%； 0＜B≤0.003%； 0＜Co≤0.2%。
The present invention is control wire rod content of elements in the steel in smelting process, in the process of above-mentioned stainless steel for soldering wire rod with the smelting process control trace element of steel, other composition of molten steel also reaches the requirement that contains chromium and nickel stainless steel for soldering wire rod, contains chromium and nickel stainless steel for soldering wire rod with the weight percent of the composition of steel molten steel to be:
0＜C≤0.03% ；0＜Si≤1.00% ； 0＜P≤0.035% ；Cr 18.50-24.00% ；
Ni 9.50-14.00% ；O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.03%
0＜Al≤0.03% ；0＜B≤0.003%； 0＜Co≤0.2%；
All the other are Fe and unavoidable impurities.
Tapping then, casting becomes qualified steel billet, enters back step rolling process.Be rolled into the stainless steel for soldering wire rod.
In order to smelt the stainless steel for soldering material that two kinds of H022Cr18Ni12Mo2 and H022Cr18Ni12Mo2Si contain molybdenum, on the basis of the smelting process of above-mentioned stainless steel for soldering wire rod, add molybdenum alloy or molybdenum again.Smelting contains the stainless steel for soldering material of chromium and nickel and molybdenum with the step of steel, is in the step of above-mentioned stainless steel for soldering wire rod with the smelting process of steel
IAfter preprocessed molten iron added in the top-blown oxygen converter, the composition requirement by chromium in the finished product and nickel and molybdenum added ferrochrome, ferronickel and ferro-molybdenum respectively; In step
IIIMolten steel joins in the ladle refining furnace, adds chromium metal and metallic nickel and metal molybdenum respectively by the requirement of chromium, nickel and molybdenum in the finished product and reaches the finished product requirement.The weight percent of the molybdenum in the molten steel is Mo 2.00-3.00%.It is identical with nickel stainless steel for soldering wire rod that other operation and smelting contain chromium.Other composition of molten steel also reaches the requirement that contains chromium and nickel and molybdenum stainless steel for soldering wire rod, contains chromium and nickel and molybdenum stainless steel for soldering wire rod with the weight percent of the composition of the molten steel of steel to be:
0＜C≤0.03% ；0＜Si≤1.00% ； 0＜P≤0.035% ；Cr 18.50-24.00% ；
Ni 9.50-14.00% ；O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.03%
0＜Al≤0.03% ；0＜B≤0.003%； 0＜Co≤0.2%；
Mo 2.00-3.00%; All the other are Fe and unavoidable impurities.
The smelting process with steel of this stainless steel for soldering wire rod is to control content of elements in the stainless steel for soldering wire rod process not smelting, mainly be to molten iron requirement low-carbon (LC), oxygen, the sulphur that certain content is arranged, other raw material may be brought some impurity in the smelting process, make aluminium, calcium, boron, cobalt contents increases, process oxidation removal aluminium in the oxygen decarburization process, calcium, boron, impurity such as cobalt, use ferrosilicon and lime deoxidization desulfuration then in the deoxidization desulfuration process, thereby assurance aluminium, calcium contents does not increase and reaches the control target, keep minimum content in the whole steelmaking process of cobalt contents, and trace B is beneficial to back step steel rolling, so in span of control, add micro-ferro-boron, finished the control requirement of whole trace elements like this.
Because require the trace element of control many in the stainless steel for soldering wire rod, general control method main threads is various, the control difficulty is big.And the advantage of control method of the present invention is to catch with smelting process control oxygen, sulphur to attach most importance to, the control of other trace element is attached most importance to molten iron is required low impurity, but in smelting process, suitably take into account other trace element, thereby simplified operation, and can accurately control desired micronutrient levels.
This stainless steel for soldering wire rod STAINLESS STEEL WIRE of steel rolling, owing to controlled content of elements, the spatter amount has reduced more than 95%, can reach 98%, 100% has eliminated because the bad welding waste product that causes of formation of weld has solved the weldprocedure problem that exists in the stainless steel welding well.
Embodiment
Describe this stainless steel for soldering wire rod and wire rod thereof in detail with the embodiment of the smelting process of steel below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Wire rod embodiment one
The stainless steel for soldering wire rod of present embodiment is H022Cr21Ni10, diameter of phi 5.5mm, and the composition of this steel grade for (weight percentage) is after the micronutrient levels control:
C 0.015% Si 0.15 P 0.020% Cr 20.35% Ni 10.02%
O 0.005% S 0.007% Ca 0.001% Al 0.01% B 0.002%
All the other are Fe and unavoidable impurities for Co 0.01%.
Control method embodiment one
What present embodiment was smelted is the stainless steel for soldering wire rod steel of wire rod embodiment one.
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C 0.5%; O 0.001%; S 0.2%; All the other are Fe and unavoidable impurities.
In 70 tons of adding top-blown oxygen converters of molten iron, add 14 tons in ferrochrome, 7 tons of Rhometals, oxygen blast gas 550m respectively by chromium in the finished product and the requirement of nickel composition
3Decarburization becomes molten steel, and carbon content reaches 0.25% and can tap;
IICarbon content is reached 0.25% molten steel add in the vacuum oxygen smelting furnace, vacuumize and reach≤oxygen blast 450m during 3mbar
3, be evacuated to 0.5mbar afterwards, again oxygen blast 550 m
3, the chemical examination composition is when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.050%； O 0.02%； S 0.035% ；
Ca 0.002%； Al 0.01%； B 0.001%； Co 0.01%；
Calculating the ferrosilicon add-on according to (1) formula then is 0.9 ton, adds 0.9 ton of ferrosilicon deoxidation,
Steel per ton adds lime 1500 kg desulfurization, by 60 m
3After/minute blowing argon gas 15min stirs,
Steel water oxygen and sulphur reach following requirement tapping:
O 0.005%；S 0.007%；
IIIMolten steel joins in the ladle refining furnace, adds chromium metal 200kg respectively and metallic nickel 150kg reaches the finished product requirement by finished product chromium, nickel, adds ferrosilicon 40kg according to finished product Si content and reaches the finished product requirement, adds boron steel 18kg, blowing argon gas then, and flow control is at 50 m
3/ min, churning time 5min and molten steel are not exposed, and chemical examination molten steel composition, aluminium, calcium, boron, cobalt reach finished product composition requirement tapping, and casting becomes qualified steel billet, enter back step rolling process.Being rolled into composition reaches wire rod and implements one stainless steel welding wire.
Wire rod embodiment two
The stainless steel for soldering wire rod of present embodiment is H022Cr21Ni10Si, diameter of phi 6.0mm, trace
The composition of this steel grade for (weight percentage) is after the constituent content control:
C 0.020% Si 0.55% P 0.018% Cr 20.00% Ni 9.80%
All the other are Fe and unavoidable impurities for O 0.01% S 0.009% Ca 0.0025% Al 0.015% B 0.003% Co 0.02%.
Control method embodiment two
What present embodiment was smelted is the stainless steel for soldering wire rod steel of wire rod embodiment two.
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C 0.6%; O 0.002%; S 0.15%; All the other are Fe and unavoidable impurities.
In 70 tons of adding top-blown oxygen converters of molten iron, add 14 tons in ferrochrome, 7 tons of Rhometals, oxygen blast gas 600m respectively by chromium in the finished product and the requirement of nickel composition
3Decarburization becomes molten steel, and carbon content reaches 0.25% and can tap;
IICarbon content is reached 0.30% molten steel add in the vacuum oxygen smelting furnace, vacuumize and reach≤oxygen blast 550m during 3mbar
3, be evacuated to 0.6mbar afterwards, again oxygen blast 600 m
3, the chemical examination composition is when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.03%； O 0.02%； S 0.035% ；
Ca 0.002%； Al 0.01%； B 0.001%； Co 0.01%；
Calculating the ferrosilicon add-on according to (1) formula then is 1.214 tons, adds 1.214 tons of ferrosilicon deoxidations, adds lime 1300 kg desulfurization again, by 60 m
3After/minute blowing argon gas 15min stirred, steel water oxygen and sulphur reached following requirement tapping:
O 0.01%；S 0.009%；
IIIMolten steel joins in the ladle refining furnace, adds chromium metal 180kg respectively and metallic nickel 120kg reaches the finished product requirement by finished product chromium, nickel, adds ferrosilicon 50kg according to finished product Si content and reaches the finished product requirement, adds boron steel 19kg, blowing argon gas then, and flow control is at 50 m
3/ min, churning time 5min and molten steel are not exposed, and chemical examination molten steel composition, aluminium, calcium, boron, cobalt reach finished product composition requirement tapping, and casting becomes qualified steel billet, enter back step rolling process.Being rolled into composition reaches wire rod and implements two stainless steel welding wire.
Wire rod embodiment three
The stainless steel for soldering wire rod of present embodiment is H022Cr18Ni12Mo2, diameter of phi 6.5mm,
The composition of this steel grade for (weight percentage) is after the micronutrient levels control:
C 0.020% Si 0.15% P 0.018% Cr 18.50% Ni 12.50%
All the other are Fe and unavoidable impurities for Mo 2.30% O 0.008% S 0.01% Ca 0.002% Al 0.02% B 0.002% Co 0.05%.
Control method embodiment three
What present embodiment was smelted is the stainless steel for soldering wire rod steel of wire rod embodiment three.
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C 0.4%; O 0.001%; S 0.25%; All the other are Fe and unavoidable impurities.
In 70 tons of adding top-blown oxygen converters of molten iron, add 12 tons in ferrochrome, 9 tons of Rhometals, 1.5 tons of ferro-molybdenums, oxygen blast gas 580m respectively by chromium, nickel and the requirement of molybdenum composition in the finished product
3Decarburization becomes molten steel, and carbon content reaches 0.25% and can tap;
IICarbon content is reached 0.25% molten steel add in the vacuum oxygen smelting furnace, vacuumize and reach≤oxygen blast 400m during 3mbar
3, be evacuated to 0.5mbar afterwards, again oxygen blast 500 m
3, the chemical examination composition is when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.05%； O 0.02%； S 0.035% ；
Ca 0.002%； Al 0.01%； B 0.001%； Co 0.01%；
Calculating the ferrosilicon add-on according to (1) formula then is 0.795 ton, adds 0.795 ton of ferrosilicon deoxidation, adds lime 1400 kg desulfurization again, by 60 m
3After/minute blowing argon gas 15min stirred, steel water oxygen and sulphur reached following requirement tapping:
0.008%；S 0.01%；
IIIMolten steel joins in the ladle refining furnace, add chromium metal 100kg, metallic nickel 120kg respectively and metal molybdenum 60kg reaches the finished product requirement by finished product chromium, nickel, molybdenum, add ferrosilicon 100kg according to finished product Si content and reach the finished product requirement, add boron steel 20kg, blowing argon gas then, flow control is at 50 m
3/ min, churning time 5min and molten steel are not exposed, the chemical examination molten steel composition, and aluminium, calcium, boron, cobalt reach
Require tapping to the finished product composition, casting becomes qualified steel billet, enters back step rolling process.Being rolled into composition reaches wire rod and implements three stainless steel welding wire.
Wire rod embodiment four
The stainless steel for soldering wire rod of present embodiment is H022Cr18Ni12Mo2Si, diameter of phi 5.5mm,
The composition of this steel grade for (weight percentage) is after the micronutrient levels control:
C 0.020% Si 0.55% P 0.018% Cr 18.70% Ni 12.80%
Mo 2.10% O 0.006% S 0.008% Ca 0.0015%
All the other are Fe and unavoidable impurities for Al 0.01% B 0.002% Co 0.01%.
Control method embodiment four
What present embodiment was smelted is the stainless steel for soldering wire rod steel of wire rod embodiment four.
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C 0.5%; O 0.001%; S 0.2%; All the other are Fe and unavoidable impurities.
In 70 tons of adding top-blown oxygen converters of molten iron, add 13 tons in ferrochrome, 10 tons of Rhometals, 1.2 tons of ferro-molybdenums, oxygen blast gas 500m respectively by chromium, nickel and the requirement of molybdenum composition in the finished product
3Decarburization becomes molten steel, and carbon content reaches 0.25% and can tap;
IICarbon content is reached 0.25% molten steel add in the vacuum oxygen smelting furnace, vacuumize and reach≤oxygen blast 600m during 3mbar
3, be evacuated to 0.5mbar afterwards, again oxygen blast 600 m
3, the chemical examination composition is when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.04%； O 0.02%； S 0.035% ；
Ca 0.002%； Al 0.01%； B 0.001%； Co 0.01%；
Calculating the ferrosilicon add-on according to (1) formula then is 1.125 tons, adds 1.125 tons of ferrosilicon deoxidations, adds lime 1200 kg desulfurization again, by 60 m
3After/minute blowing argon gas 15min stirs, in the molten steel
Oxygen and sulphur reach following requirement tapping: O 0.006%; S 0.008%;
IIIMolten steel joins in the ladle refining furnace, add chromium metal 150kg, metallic nickel 130kg respectively and metal molybdenum 50kg reaches the finished product requirement by finished product chromium, nickel, molybdenum, add ferrosilicon 90kg according to finished product Si content and reach the finished product requirement, add boron steel 18kg, blowing argon gas then, flow control is 50
m
3/ min, churning time 5min and molten steel are not exposed, and chemical examination molten steel composition, aluminium, calcium, boron, cobalt reach finished product composition requirement tapping, and casting becomes qualified steel billet, enter back step rolling process.Being rolled into composition reaches wire rod and implements four stainless steel welding wire.
Claims (1)
1. a stainless steel for soldering wire rod is with the smelting process of steel, and it comprises following sequential steps:
IThe preprocessed molten iron of the weight percent of following compositions is added in the top-blown oxygen converter:
C≤0.6%; O≤0.003%; S 0.1-0.3%; All the other are Fe and unavoidable impurities;
Composition requirement by chromium in the finished product and nickel adds ferrochrome, Rhometal respectively, molten steel oxygen blast gas 5-6m per ton
3Decarburization becomes molten steel, and carbon content reaches the 0.2-0.3% tapping;
IIThe molten steel that carbon content is reached 0.2-0.3% adds in the vacuum oxygen smelting furnace, vacuumizes≤steel oxygen blast 4-5m per ton during 300Pa
3, be evacuated to 50-80Pa afterwards, again steel oxygen blast 5-6 m per ton
3, the chemical examination composition is when carbon content, oxygen level, sulphur content, calcium contents, aluminium content, boron content and cobalt contents are following mass percent in the molten steel;
C 0.010-0.030%； O 0.01-0.03%； S 0.03-0.05% ；
Ca 0-0.002%； Al 0-0.02%； B 0-0.001%； Co 0-0.05%；
Calculate the ferrosilicon add-on by total blowing oxygen quantity in converter and the vacuum smelting furnace with following (1) formula, add the ferrosilicon deoxidation;
Fe-Si amount=1.50 * be blown into total oxygen demand-700 * carbon content (%)-1390 (1)
The unit of ferrosilicon add-on is kg; The unit that is blown into total oxygen demand is m
3
Molten steel per ton adds lime 11-22 kg desulfurization again, presses 50-100 m
3After/minute blowing argon gas 15min ± 3 min stirred, steel water oxygen and sulphur reached following requirement tapping:
O 0.003-0.015%；S 0.005-0.015%；
IIIMolten steel joins in the ladle refining furnace, add chromium metal respectively and metallic nickel reaches the finished product requirement by the requirement of chromium, nickel in the finished product, add ferrosilicon according to finished product Si content and reach the finished product requirement, molten steel per ton adds boron steel 0.1-0.3kg, blowing argon gas then, flow control is at 50-100 m
3/ min, churning time＞3min and molten steel are not exposed, the chemical examination molten steel composition, and the weight percent of oxygen, sulphur, aluminium, calcium, boron and cobalt reaches following value, reaches the requirement to trace element control:
O 0.003-0.015%； S 0.005-0.015%； 0＜Ca≤0.005%；
0＜Al≤0.03%； 0＜B≤0.003%； 0＜Co≤0.2%。
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| CN103320565B (en) * | 2013-06-19 | 2014-09-17 | 武汉钢铁(集团)公司 | Method for controlling P in smelted H08 welding wire |
| CN110014248A (en) * | 2019-05-15 | 2019-07-16 | 丹阳市华龙特钢有限公司 | A kind of preparation method of Ni-based high-temperature-resistant and anti-corrosion welding wire |
| CN112430786B (en) * | 2020-11-23 | 2022-02-18 | 山西太钢不锈钢股份有限公司 | Stainless steel wire for welding in hydropower industry and preparation method thereof |
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| CN1768156A (en) * | 2003-03-02 | 2006-05-03 | 山特维克知识产权股份有限公司 | Duplex stainless steel alloy for use in seawater applications |
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| JPH093590A (en) * | 1995-06-21 | 1997-01-07 | Nippon Steel Corp | Oxide dispersion strengthened ferritic heat resistant steel sheet and its production |
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| CN1768156A (en) * | 2003-03-02 | 2006-05-03 | 山特维克知识产权股份有限公司 | Duplex stainless steel alloy for use in seawater applications |
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| 赵玉珍 史耀武.表面活性元素硫对焊接熔池中流体流动方式和熔池深宽比的影响.《钢铁研究学报》.2004,第16卷(第4期), * |
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