CN104862449B - The control method of nitrogen in a kind of steel for saw blade substrate - Google Patents
The control method of nitrogen in a kind of steel for saw blade substrate Download PDFInfo
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Abstract
The control method of nitrogen in a kind of steel for saw blade substrate: molten iron carries out desulfurization and skims；Converter smelting；When the 1/4 of tapping to molten steel total amount, add ferromanganese, ferrosilicon, ferrochrome, carbon dust；And stirring terminates to tapping；Argon station processes；LF stove refine, and add aluminum steel or aluminum shot, the content of N is less than 55PPm；Cast under argon shield.The present invention has broken traditional fixed pattern thinking, changes the alloy addition sequence in alloying process and flow process, i.e. without Al Fe, Al alloying deoxidation in early stage converter tapping process, changes into adding aluminum mode in the LF furnace rear phase.It adds aluminum mode can make the amount ratio of aluminum consumption in the alloying of converter tapping can reduce about 15%, not only meets requirement, and reduces production cost, and the more mainly nitrogen content in steel is less than 50ppm.Present disclosure applies equally to titanium alloy, titanium alloy will be converted into by aluminium alloy.
Description
Technical field
The present invention relates to the control method of impurity in the smelting of a kind of tool steel, specifically belong to a kind of steel for saw blade substrate
The control method of nitrogen in smelting.
Background technology
Nitrogen in steel is controlled to have higher requirements by steel for saw blade substrate, and when the nitrogen content in steel is higher, especially its content is big
When 80PPm, more easily cause product cracking.Therefore, in the delivery standard of this product, require the N≤80ppm in steel.But,
Alloy amount in coping saw blade matrix steel is relatively big, carbon is higher, makes the N in steel be difficult to control at below 80PPm, often for being more than
80ppm, even up to reaches 100 ppm.Causing conforming product rate low, saw blade uses the cycle short, the high deficiency of production cost.
From the point of view of the most at present, in steel for saw blade substrate, the control of nitrogen has become the key link smelting steel for saw blade substrate.
Current domestic steel for saw blade substrate, in terms of nitrogen control, does not still have clear and definite control requirement, and some factories and mines is producing
During medium high carbon alloy steel, in order to control N content, typically using the process route processed into vacuum drying oven, there is the energy and disappears in its mode
Consumption height, the cost of resistance to material is high, and N content is still at more than 60PPm.
And the present invention, then use the common process into LF stove, add aluminum opportunity and addition by control, it is possible to reach
Entering vacuum drying oven and process technological effect, process line is simple, it is possible to decrease the cost of resistance to material 1.2kg/t steel, steam and water consumption 15kg/t.
Summary of the invention
The N content that the present invention is directed in prior art in steel is high, i.e. at more than 80PPm, and causes percent defective high, and product makes
Short wait deficiency with the cycle, it is provided that a kind of the content of N can be made in molten steel at below 55PPm, improve conforming product rate and meet user
The control method of nitrogen in the steel for saw blade substrate required.
Realize the measure of above-mentioned purpose:
The control method of nitrogen in a kind of steel for saw blade substrate, its step:
1) molten iron carries out desulfurization and skims, and controls the weight percent content of S in desulfurized molten iron and ,≤0.005%, skims
After molten iron exposed surface be not less than 95%；
2) carry out converter smelting, and the weight percent content controlling terminal C is not less than 0.05%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 18-22kg/ ton steel is the ferromanganese of 6 ~ 7%, according to
2.8-3.2 kg/ ton steel adds ferrosilicon, and adding containing C according to 2.3-2.7 kg/ ton steel is the ferrochrome of 8 ~ 10%, according to 3.6-4.0
Kg/ ton steel adds carbon dust；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 500 ~ 700 liters/min, argon blowing time is 3 ~ 5 minutes,
Each constituent content reaches to be not less than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 2.0 ~ 3.5 kg/ ton steel, add according to 0.7-0.8 kg/ ton steel
Enter refining slag, add carbide according to 0.2 ~ 0.4 kg/ ton steel and carry out slag making, stir 3 ~ 5 minutes；Heat time heating time is less than 6 minutes,
Wherein add transconversion into heat slag temperature at 1590 ~ 1610 DEG C；Heating adds vanadium iron according to 2.2-2.6 kg/ ton steel after terminating；Above-mentioned raw materials
All need to add in entering 30 minutes of LF furnace rear；
6) being stirred desulfurization at LF stove, argon flow amount is at 300 ~ 500 liters/min, and the time controls within 5 minutes,
Molten steel adds aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.015 ~ 0.045% and be
Accurate；Add after aluminum terminates, argon flow amount is controlled at 50 ~ 100 liters/min；And controlling the basicity of slag 6 ~ 9, the content of N is less than
55PPm；
7) cast under argon shield.
The present invention does not adds aluminum or alfer in the alloying of tapping because nitrogen element in steel, dissolubility is very
Greatly, use aluminum deep deoxidation too early, make the nitrogen element in air easily and in steel, the aluminum production [AlN] that reacts is dissolved in molten steel,
It is difficult to get rid of again.
Why the present invention adds aluminum steel or aluminum shot in sweetening process, and controls its aluminum content 0.015 ~ 0.045%,
This aluminum content can effectively guarantee that oxygen content in steel is at zone of reasonableness, it is ensured that follow-up coil of strip quality.Meanwhile, nitrogen unit can be limited
Element melts content in steel admittedly.
The present invention compared with prior art, has broken traditional fixed pattern thinking, has changed the alloy in alloying process
Addition sequence and flow process, i.e. without Al-Fe, Al alloying deoxidation in early stage converter tapping process, change into adding in the LF furnace rear phase
Aluminum mode, and reduce aluminum shot, aluminum steel, the usage amount of aluminum calcium line as far as possible, its amount ratio consumption in the alloying of converter tapping
Can reduce about 15%, not only meet requirement, and reduce production cost, the more mainly nitrogen content in steel is less than 50ppm.
Present disclosure applies equally to titanium alloy, titanium alloy will be converted into by aluminium alloy.
Detailed description of the invention
Below the present invention is described in detail:
Embodiment 1
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.5238% Si
0.2033% Mn 1.488% P≤0.02% S≤0.01% N≤0.01% Als 0.025% Gr 0.23% V 0.106%,
Remaining is Fe and inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0048%, after skimming
Molten iron exposed surface is 95.2%；
2) carry out converter smelting, the weight percent content of terminal C 0.051%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 19.5kg/ ton steel is the ferromanganese of 6%, according to 3.1
Kg/ ton steel adds ferrosilicon, and adding containing C according to 2.5 kg/ ton steel is the ferrochrome of 9.1%, adds carbon dust according to 3.78 kg/ ton steel；
And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 500 liters/min, argon blowing time is 3.5 minutes, each unit
Element has reached more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.0 kg/ ton steel, add refining slag according to 0.7kg/ ton steel,
Add carbide according to 0.22kg/ ton steel and carry out slag making, stir 3 minutes；Heat time heating time is 6 minutes, wherein adds transconversion into heat slag temperature and is
1592℃；Heating adds vanadium iron according to 2.4 kg/ ton steel after terminating；Above-mentioned raw materials is whole in entering 29 minutes of LF furnace rear
Add；
6) being stirred desulfurization at LF stove, argon flow amount is at 425 liters/min, and the time controls, at 4 minutes, to add in molten steel
Enter aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.025%, add after aluminum terminates, by argon
Flow-control is at 80 liters/min；And control the basicity of slag 6.8, the content 49PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 250 Kg, after using the present invention, actual
Only use 100 Kg, use 150 Kg than the fewest；Through on probation, prepared saw blade does not produces cracking phenomena.
Embodiment 2
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.531% Si 0.202%
Mn 1.498% P≤0.02% S≤0.01% N≤0.01% Als 0.018% Gr 0.23% V 0.11 %, remaining is Fe
And inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0049%, after skimming
Molten iron exposed surface is 95.2%；
2) carry out converter smelting, the weight percent content of terminal C 0.055%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 20.7 kg/ ton steel is the ferromanganese of 6%, according to
2.95kg/ ton steel adds ferrosilicon, and adding containing C according to 2.61 kg/ ton steel is the ferrochrome of 9.1%, adds according to 3.65kg/ ton steel
Carbon dust；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 520 liters/min, argon blowing time is 4 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and according to. 2.7 kg/ ton steel add Calx, add refine according to 0.73kg/ ton steel
Slag, adds carbide according to 0.32kg/ ton steel and carries out slag making, stir 3.5 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag
Temperature is 1598 DEG C；Heating adds vanadium iron according to 2.4 kg/ ton steel after terminating；Above-mentioned raw materials is in entering 27 minutes of LF furnace rear
The most all add；
6) being stirred desulfurization at LF stove, argon flow amount is at 315 liters/min, and the time controls, at 5 minutes, to add in molten steel
Enter aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.018% and be as the criterion；Add after aluminum terminates, will
Argon flow amount controls at 78 liters/min；And control the basicity of slag 6.8, the content 47PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 237Kg, and after using the present invention, reality is only
With 98Kg, than original few 139Kg；Through on probation, the saw blade of preparation does not produces cracking phenomena.
Embodiment 3
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.527% Si 0.193%
Mn 1.502% P≤0.02% S≤0.01% N≤0.01% Als 0.0232% Gr 0.22% V 0.12%, remaining is Fe
And inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0037%, after skimming
Molten iron exposed surface is 95.2%；
2) carry out converter smelting, the weight percent content of terminal C 0.057%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 21.3kg/ ton steel is the ferromanganese of 6%, according to 2.9kg/
Ton steel adds ferrosilicon, and adding containing C according to 2.52 kg/ ton steel is the ferrochrome of 9.1%, adds carbon dust according to 3.7kg/ ton steel；And stir
Mix to tapping and terminate；
4) entering argon station to process, and control argon flow amount at 605 liters/min, argon blowing time is 4 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.5kg/ ton steel, add refining slag according to 0.78kg/ ton steel,
Add carbide according to 0.33kg/ ton steel and carry out slag making, stir 4 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag temperature and is
1600℃；Heating adds vanadium iron according to 2.3 kg/ ton steel after terminating；Above-mentioned raw materials is whole in entering 29 minutes of LF furnace rear
Add；
6) being stirred desulfurization at LF stove, argon flow amount is at 430 liters/min, and the time controls, at 6 minutes, to add in molten steel
Enter aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.0232%, add after aluminum terminates, by argon
Throughput controls at 81 liters/min；And control the basicity of slag 7, the content 47PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 246Kg, and after using the present invention, reality is only
With 91Kg, than original few 155Kg；Through on probation, the saw blade of preparation does not produces cracking phenomena.
Embodiment 4
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.5200% Si 0.21%
Mn 1.49% P≤0.02% S≤0.01% N≤0.01% Als 0.026% Gr 0.224% V 0.10%,
Remaining is Fe and inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0041%, after skimming
Molten iron exposed surface is 96%；
2) carry out converter smelting, the weight percent content of terminal C 0.059%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 19.7 kg/ ton steel is the ferromanganese of 6%, according to
2.9kg/ ton steel adds ferrosilicon, and adding containing C according to 2.52 kg/ ton steel is the ferrochrome of 9.1%, adds carbon according to 3.7kg/ ton steel
Powder；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 600 liters/min, argon blowing time is 4 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.0 kg/ ton steel, add refining slag according to 0.60kg/ ton steel,
Add carbide according to 0.3kg/ ton steel and carry out slag making, stir 4.5 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag temperature
It it is 1601 DEG C；Heating adds vanadium iron according to 2.4 kg/ ton steel after terminating；Above-mentioned raw materials is the most complete in entering 25 minutes of LF furnace rear
Portion adds；
6) being stirred desulfurization at LF stove, argon flow amount is at 500 liters/min, and the time controls, at 4 minutes, to add in molten steel
Enter aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.026%, add after aluminum terminates, by argon
Flow-control is at 89 liters/min；And control the basicity of slag 7.1, the content 42PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 253Kg, and after using the present invention, reality is only
With 91Kg, than original few 162Kg；Through on probation, prepare saw blade and do not produce cracking phenomena.
Embodiment 5
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.5217% Si
0.205% Mn 1.52% P≤0.02% S≤0.01% N≤0.01% Als 0.024% Gr 0.22% V 0.098%,
Remaining is Fe and inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0038%, after skimming
Molten iron exposed surface is 95.7%；
2) carry out converter smelting, the weight percent content of terminal C 0.058%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 20 kg/ ton steel is the ferromanganese of 6%, according to 3.0kg/
Ton steel adds ferrosilicon, and adding containing C according to 2.5 kg/ ton steel is the ferrochrome of 9.1%, adds carbon dust according to 3.7kg/ ton steel；And stir
Mix to tapping and terminate；
4) entering argon station to process, and control argon flow amount at 600 liters/min, argon blowing time is 5 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.0 kg/ ton steel, add refining slag according to 0.60kg/ ton steel,
Add carbide according to 0.35kg/ ton steel and carry out slag making, stir 5 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag temperature and is
1602℃；Heating adds vanadium iron according to 2.4 kg/ ton steel after terminating；Above-mentioned raw materials is whole in entering 27 minutes of LF furnace rear
Add；
6) being stirred desulfurization at LF stove, argon flow amount is at 410 liters/min, and the time controls, at 5 minutes, to add in molten steel
Enter aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.024%, add after aluminum terminates, by argon
Flow-control is at 66 liters/min；And control the basicity of slag 7.2, the content 45PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 248.5Kg, after using the present invention, actual
Only use 99Kg, than original few 149.5Kg；Through on probation, prepare saw blade and do not produce cracking phenomena.
Embodiment 6
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.5301% Si
0.212% Mn 1.497% P≤0.02% S≤0.01% N≤0.01% Als 0.019% Gr 0.20% V 0.12 %,
Remaining is Fe and inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0048%, after skimming
Molten iron exposed surface is 95.2%；
2) carry out converter smelting, the weight percent content of terminal C 0.056%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 20.6 kg/ ton steel is the ferromanganese of 6%, according to
3.0kg/ ton steel adds ferrosilicon, and adding containing C according to 2.53 kg/ ton steel is the ferrochrome of 9.1%, adds carbon according to 3.8kg/ ton steel
Powder；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 550 liters/min, argon blowing time is 4 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.0 kg/ ton steel, add refining slag according to 0.60kg/ ton steel,
Add carbide according to 0.32kg/ ton steel and carry out slag making, stir 3.8 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag temperature
It it is 1597 DEG C；Heating adds vanadium iron according to 2.5 kg/ ton steel after terminating；Above-mentioned raw materials is the most complete in entering 27 minutes of LF furnace rear
Portion adds；
6) being stirred desulfurization at LF stove, argon flow amount is at 450 liters/min, and the time controls at 5min, adds in molten steel
Aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.019%, add after aluminum terminates, by argon stream
Amount controls at 77 liters/min；And control the basicity of slag 7.8, the content 42PPm of N;；
7) cast under argon shield.
Through statistics, this steel saw blade according to original technique, needs the ferro-aluminum added and be 244Kg, after using the present invention, and reality
Only use 98Kg, than original few 146Kg；Through on probation, prepare saw blade and do not produce cracking phenomena.
Embodiment 7
The present embodiment smelt saw bit matrix steel chemical composition and weight percent content be: C 0.512% Si 0.212%
Mn 1.51% P≤0.02% S≤0.01% N≤0.01% Als 0.022% Gr 0.23% V 0.12%,
Remaining is Fe and inevitable impurity.
The rate-determining steps of nitrogen in its steel for saw blade substrate:
1) molten iron carries out desulfurization and skims, and in desulfurized molten iron, the weight percent content of S is 0.0031%, after skimming
Molten iron exposed surface is 98%；
2) carry out converter smelting, the weight percent content of terminal C 0.068%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 19.4 kg/ ton steel is the ferromanganese of 6%, according to
2.9kg/ ton steel adds ferrosilicon, and adding containing C according to 2.52 kg/ ton steel is the ferrochrome of 9.1%, adds carbon according to 3.7kg/ ton steel
Powder；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 600 liters/min, argon blowing time is 5 minutes, each element
Reach more than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 3.0 kg/ ton steel, add refining slag according to 0.60kg/ ton steel,
Add carbide according to 0.32kg/ ton steel and carry out slag making, stir 4 minutes；Heat time heating time is 5 minutes, wherein adds transconversion into heat slag temperature and is
1598℃；Heating adds vanadium iron according to 2.4 kg/ ton steel after terminating；Above-mentioned raw materials is whole in entering 26 minutes of LF furnace rear
Add；
6) being stirred desulfurization at LF stove, argon flow amount is at 400 liters/min, and the time controls at 5min, adds in molten steel
Aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.022%, add after aluminum terminates, by argon stream
Amount controls at 81 liters/min；And control the basicity of slag 7.2, the content 40PPm of N；
7) cast under argon shield.
Through statistics, this steel saw blade is according to original technique, and needing the ferro-aluminum added is 247Kg, and after using the present invention, reality is only
With 110Kg, than original few 137Kg；Through on probation, prepare saw blade and do not produce cracking phenomena.
This detailed description of the invention is only and most preferably enumerates, the not restricted enforcement to technical solution of the present invention.
Claims (1)
1. a control method for nitrogen in steel for saw blade substrate, its step:
1) molten iron carries out desulfurization and skims, and in control desulfurized molten iron, the weight percent content of S is ≤0.005%, after skimming
Molten iron exposed surface is not less than 95%；
2) carry out converter smelting, and the weight percent content controlling terminal C is not less than 0.05%, and conventional omnidistance Argon；
3) when the 1/4 of tapping to molten steel total amount, adding containing C according to 18-22kg/ ton steel is the ferromanganese of 6 ~ 7%, according to 2.8-3.2
Kg/ ton steel adds ferrosilicon, and adding containing C according to 2.3-2.7 kg/ ton steel is the ferrochrome of 8 ~ 10%, adds according to 3.6-4.0 kg/ ton steel
Enter carbon dust；And stirring terminates to tapping；
4) entering argon station to process, and control argon flow amount at 500 ~ 700 liters/min, argon blowing time is 3 ~ 5 minutes, each unit
Cellulose content reaches to be not less than the 80% of desired value；
5) LF stove refine is carried out: and add Calx according to 2.0 ~ 3.5 kg/ ton steel, add essence according to 0.7-0.8 kg/ ton steel
Refining slag, adds carbide according to 0.2 ~ 0.4 kg/ ton steel and carries out slag making, stir 3 ~ 5 minutes；Heat time heating time be less than 6 minutes, wherein
Add transconversion into heat slag temperature at 1590 ~ 1610 DEG C；Heating adds vanadium iron according to 2.2-2.6 kg/ ton steel after terminating；Above-mentioned raw materials need to be
All add in entering 30 minutes of LF furnace rear；
6) being stirred desulfurization at LF stove, argon flow amount is at 300 ~ 500 liters/min, and the time controls within 5 minutes, at molten steel
Middle addition aluminum steel or aluminum shot, its addition so that in molten steel the weight percent content of aluminum reach 0.015 ~ 0.045% and be as the criterion；Add
After aluminum terminates, argon flow amount is controlled at 50 ~ 100 liters/min；And controlling the basicity of slag 6 ~ 9, the content of N is less than 55PPm；
7) cast under argon shield.
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| CN108220532A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Secondary refining method for improving cleanliness of molten steel |
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