CN100519800C - Method for producing low-oxygen high-carbon chromium bearing steel by converter continuous casting process - Google Patents
Method for producing low-oxygen high-carbon chromium bearing steel by converter continuous casting process Download PDFInfo
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- CN100519800C CN100519800C CNB2007100483952A CN200710048395A CN100519800C CN 100519800 C CN100519800 C CN 100519800C CN B2007100483952 A CNB2007100483952 A CN B2007100483952A CN 200710048395 A CN200710048395 A CN 200710048395A CN 100519800 C CN100519800 C CN 100519800C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 141
- 239000010959 steel Substances 0.000 title claims abstract description 141
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 56
- 239000011651 chromium Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 238000009749 continuous casting Methods 0.000 title claims abstract description 22
- 239000001301 oxygen Substances 0.000 title claims description 17
- 229910052760 oxygen Inorganic materials 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 97
- 229910052786 argon Inorganic materials 0.000 claims abstract description 49
- 239000002893 slag Substances 0.000 claims abstract description 47
- 238000003723 Smelting Methods 0.000 claims abstract description 25
- 238000010079 rubber tapping Methods 0.000 claims abstract description 20
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 18
- 238000005266 casting Methods 0.000 claims abstract description 16
- 238000009847 ladle furnace Methods 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 8
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 8
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 8
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 8
- 239000001095 magnesium carbonate Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000009489 vacuum treatment Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 238000004512 die casting Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910017060 Fe Cr Inorganic materials 0.000 description 3
- 229910002544 Fe-Cr Inorganic materials 0.000 description 3
- 229910017082 Fe-Si Inorganic materials 0.000 description 3
- 229910017133 Fe—Si Inorganic materials 0.000 description 3
- 229910006639 Si—Mn Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000006253 pitch coke Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 150000001485 argon Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention aims to solve the technical problem of providing a production method of high-carbon chromium bearing steel by smelting in a converter and casting molten steel in a continuous casting machine, which comprises the following steps: 1) adding 6.0-7.5 kg of slag charge into each ton of steel in the process of tapping from a converter to a steel ladle, and blowing argon under the pressure of 0.4-0.6 MPa after tapping; 2) refining in a ladle furnace: adding 3.5-4.5 kg of slag charge into each ton of steel again, and controlling (CaO + MgO)/(SiO) in the slag2+Al2O3) 1.0 to 2.0; 3) carrying out vacuum treatment on molten steel: [ Al ] in molten Steels]Controlling the content of the active carbon to be more than 0.015 percent; 4) casting on a continuous casting machine. T0 of high carbon chromium bearing steel produced by the method of the present invention]Up to 9X 10-6The following.
Description
Technical field
The present invention relates to produce the method for bearing steel, particularly relate to a kind of method that adopts converter and continuous caster to produce high-carbon-chromium bearing steel.
Background technology
High-carbon-chromium bearing steel is the most classical and the bearing steel usage quantity maximum, studies show that the T[O of high-carbon-chromium bearing steel] (oxygen level) be the most critical index of bearing fatigue life, T[O] low more fatigue lifetime is high more, therefore, the quality of raising high-carbon-chromium bearing steel is mainly reflected in the T[O that how to reduce high-carbon-chromium bearing steel] on.
High-carbon-chromium bearing steel adopts electrosmelting basically, and electric furnace is with respect to the converter smelting high-carbon-chromium bearing steel, and the smelting cycle of electric furnace is long, and is also long in the time of rear portion liquid steel refining, obtains low T[O easily] high-carbon-chromium bearing steel.The smelting cycle of converter only is 1/2 to 1/4 of an electric furnace, and the rear portion liquid steel refining time is very short, is difficult to obtain low T[O] high-carbon-chromium bearing steel, so the producer that adopts the converter smelting high-carbon-chromium bearing steel is seldom.In order to produce low T[O] high-carbon-chromium bearing steel, the general flow process that adopts then is electrosmelting → refining furnace refining → vacuum oven processing → die casting.ZL0132236.5 discloses a kind of employing " direct current furnace just refines → the ladle furnace bottom ar blowing refining → vacuum oven degassing → die casting " production technique, can produce T[O] be not more than 7 * 10
-6High-carbon-chromium bearing steel.CN200410025102.5 discloses a kind of production method of high-carbon-chromium bearing steel, has remedied the deficiency of ZL0132236.5, has improved low T[O] rate that is smelt of high-carbon-chromium bearing steel.But above-mentioned technology has all adopted electric furnace and die casting, and the electrosmelting steel, efficient is low, need consume a large amount of electric energy simultaneously; Die casting then is that a labour intensity is big, and the production method that operating rate is very low has been filtering technique.
" special steel " magazine (in January, 2004, the 25th 1 phase of volume, P41～42) reported that Benxi special steel limited liability company adopts 120t converter → 150tLF refining furnace → die casting 3.16t explained hereafter high-carbon-chromium bearing steel, this research draws, control converter terminal [C] 〉=0.40%, control [P]≤0.10%, the LF stove adopts the CaO-Si of low basicity
2O
3The slag system refining adopts weak Argon to stir T[O in the high-carbon-chromium bearing steel] be 10 * 10
-6With 9 * 10
-6" iron and steel " magazine (in December, 2000, the 35th 12 phases of volume, P19～22) has reported that Japanese Wakayama factory adopts converter → RH → CC explained hereafter high-carbon-chromium bearing steel, T[O in the steel] be 6 * 10
-6, Thyssen adopts 140t converter → RH → line feeding → CC explained hereafter high-carbon-chromium bearing steel, T[O in the steel] and be 12 * 10
-6
" special steel " produces the situation of high-carbon-chromium bearing steel though magazine has been reported converter, and introduced part producing technology and technology, the T[O of high-carbon-chromium bearing steel] be 10 * 10
-6With 9 * 10
-6, be in the higher scope, and do not adopt high-level efficiency, the high-carbon-chromium bearing steel of continuous-casting steel pouring technology casting cheaply.
Summary of the invention
Technical problem to be solved by this invention provides a kind of converter smelting, continuous caster carries out the production method of the high-carbon-chromium bearing steel of molten steel casting, and the T[O of the high-carbon-chromium bearing steel that obtains] reach 9 * 10
-6Below.
The technical scheme that technical solution problem of the present invention is adopted is: revolving furnace continuous casting technology is produced the method for low-oxygen high-carbon and high-chromium bearing steel, this method may further comprise the steps: 1) smelting molten steel in converter: converter tapping steel per ton in the process of ladle adds the slag charge of 6.0～7.5kg, adopts the pressure of 0.4～0.6MPa to carry out Argon after having gone out steel; 2) in the ladle furnace refining: in ladle furnace refining, steel per ton adds the slag charge of 3.5～4.5kg once more, (CaO+MgO)/(SiO in the control slag
2+ Al
2O
3) be 1.0～2.0; 3) molten steel is carried out vacuum-treat: during the vacuum-treat, [the Al in the molten steel
s] be controlled at more than 0.015%; 4) casting on continuous caster.
Further, during the described converter smelting of step 1, add C content in the converter and blow greater than 3.0% molten iron.
Further, during the described converter smelting of step 1, steel per ton adds 50～70kg lime.
Further, during the described converter smelting of step 1, add the solid slag of MgO content 〉=25% in last 1～2 minute in blowing, the content that makes MgO in the converter slag is 10%～12%.
Further, described solid slag is that MgO content is 27%～38% high magnesite or rhombspar.
Further, during the described converter smelting of step 1, CaF in the control slag
2Be 3.0%～5.5%.
Further, after the described Argon of step 1, molten steel is carried out deoxidation, control α [O]≤15 * 10 with metal A l
-6, [Al
s] be 0.020%～0.060%.
Further, after the described slag charge of step 2 adds, heat, when temperature is heated to 1545～1570 ℃, stop heating with the electrode pair molten steel.
Further, carry out Argon between described heating period, argon flow amount is controlled to be 18～30m
3/ h.
Further, during the described vacuum-treat of step 3, vacuum degree control is below 300Pa, and vacuum processing time is controlled at more than the 12min.
The invention has the beneficial effects as follows:
1. efficient height
The time of adopting the inventive method to produce a stove high-carbon-chromium bearing steel is 25～45min, only be Electric furnace steel making produce the stove high-carbon-chromium bearing steel time 1/2 to 1/4.
2. energy consumption is low
Converter is when smelting steel, and elements such as C, Si in the dioxygen oxidation molten iron that is blown into and Mn can be emitted a large amount of heats, reaches the purpose that improves liquid steel temperature, so molten steel does not need external thermal source when smelting in converter.
3. be convenient to the automatization control of converter steel factory
Only need converter control terminal point [C] 〉=0.03%, be convenient to the organization of production and the full-automatic control of converter steel factory.
4. intensity of workers is low
Adopt the mode of continuous casting steel machine, significantly reduced staff's labour intensity.
Embodiment
Production method of the present invention is 4 step production methods, and its technical process is: converter smelting → ladle refining → vacuum-treat → continuous casting.
The first step: converter smelting
During converter smelting, the interior adding of converter C content blows greater than 3.0% molten iron; Quantity by steel adding 50～70kg lime per ton in blowing is added in the converter, contain the higher solid slag of MgO content bessemerizing to add in last 1～2 minute, to improve content to 10%～12% of MgO in the converter slag, its objective is: improve basicity; Make to have the part solid formation in the converter slag, make converter slag be not easy to flow in the ladle with converter tapping.Converter smelting endpoint [C] is controlled at tapping more than 0.03%; In the converter tapping process, carry out the alloying of C, Si, Mn and Cr element, and add the slag charge of 6.0～7.5kg, (CaO+MgO)/(SiO in the control slag with tapping process steel per ton by the requirement of high-carbon-chromium bearing steel
2+ Al
2O
3) be 1.0～2.0, CaF
2Be 3.0%～5.5%.Gone out ladle to be carried out big flow Argon behind the steel (argon pressure is 0.4～0.6MPa, and argon flow amount is 18～30m
3/ h), argon blowing time is 12～14min.During this Argon, because flow and pressure are big, molten steel can be exposed in the air.After the big flow Argon, molten steel is carried out deoxidation, control α with the method for feeding aluminum steel
[O]≤ 15 * 10
-6, [Al
s] in 0.020%～0.060% scope, during feeding aluminum steel not Argon or with the low discharge Argon (argon pressure is 0.2～0.4MPa, and argon flow amount is 8～14m
3/ h), the low discharge Argon is carried out with the moving Argon intensity that gets final product of molten steel microwave, and the Argon in this stage should avoid molten steel to be exposed in the air.
Second step: ladle refining
In ladle furnace refining, steel per ton adds the slag charge of 3.5～4.5kg once more, (CaO+MgO)/(SiO in the control slag
2+ Al
2O
3) be 1.0～2.0, CaF
2Be 3.5%～6.0%.If the slag on ladle furnace surface (or being slag) has been solid state, then must can add above-mentioned slag charge with behind the electrode pair ladle furnace heating 5min.After the ladle furnace slag charge adds, heat, when temperature is heated to 1545～1570 ℃, stop heating, ladle is moved on to vacuum treatment installation, carry out the work of following step with the electrode pair molten steel.Must carry out Argon at ladle furnace between heating period, argon flow amount is controlled to be 18～30m
3/ h.
The 3rd step: vacuum-treat
After ladle arrives vacuum treatment installation, measure [Al immediately
s], because during vacuum-treat, 25%～40% [Al is arranged in the molten steel
s] can be by scaling loss, so as [the Al in the molten steel
s]＜0.02%, must be before vacuum-treat or the vacuum treated starting stage with the [Al in the molten steel
s] adjust in 0.02%～0.04% the scope, to guarantee [the Al in the molten steel
s] during the vacuum-treat all more than 0.015%.Vacuum degree control is below 300Pa during vacuum-treat, and vacuum processing time must be controlled at more than the 12min.
The 4th step: continuous casting
The continuous caster casting speed is controlled at 0.40～0.75m/min, and caster two cold section specific water is 0.25～0.28L/kg, and crystallizer induction stirring current control is 300～600A.
The invention will be further described below in conjunction with embodiment:
Embodiment 1:
The converter smelting molten steel:
After adding C content in the converter and be 3.98% molten iron 130.5t, lime 8.5t (the about 65kg of steel per ton), blow.The high magnesite 1.0t that adds MgO content 33.5% behind the blowing 15min, MgO is 10.2% in the control converter slag, increases the 1min tapping of blowing again behind the magnesite, tapping C is 0.12%; Add pitch coke, Fe-Si, Fe-Si-Mn, Fe-Cr in the tapping process and carry out C, the Si of bearing steel, the alloying of Mn, Cr, the add-on of each alloy is as the criterion in the scope that standard of high-carbon chromium hearing steel requires with control C, Si, Mn, Cr; Tapping process adds slag charge 820kg (the about 6.3kg of steel per ton) simultaneously, control (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.85; Ladle adopts the big flow Argon in bottom, and the Argon pressure-controlling is 0.4MPa, argon flow amount 20m
3/ h, argon blowing time 13min; After big flow Argon stops, feeding Al line 300m (every meter 0.2kg adds up to 60kg) with feeding wire machine, at this moment the α in the molten steel
[O]Be 1.8 * 10
-6, [Al
s] be 0.024%.
LF ladle refining furnace refined molten steel:
After the ladle that molten steel is housed is transported to LF stove electrically heated operation, in ladle, add slag charge 480kg (the about 3.7kg of steel per ton) once more, add slag charge after LF begin heating, heat 10min after, temperature stops heating when reaching 1555 ℃, get slag specimen analysis (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.80; During the electrically heated of LF stove, argon blowing rate is controlled to be 20m
3/ h.
Vacuum oven is handled molten steel:
After ladle arrives vacuum treatment installation, measure [Al
s] be 0.012%, 2min adds Al ball 15kg after the vacuum-treat, control [Al
s] be 0.021%; Vacuum tightness is 100Pa during vacuum-treat, and vacuum processing time is 14min.
Continuous casting steel:
Molten steel after the vacuum-treat is in the 6 stream billet caster top castings of 6 machines, and the strand transverse section is 280mm * 380mm, and measuring and wrapping temperature in the casting machine is 1485 ℃, and casting machine draws number to be 0.50m/min, two cold specific water 0.27L/kg, and crystallizer induction stirring electric current is 300A.
At last, by the requirement of GB11261-89 " high-carbon-chromium bearing steel chemical analysis-pulse heating indifferent gas fusion infrared absorption is measured the oxygen amount " standard, measure the T[O of this stove high-carbon-chromium bearing steel] be 6.8 * 10
-6
Embodiment 2:
The converter smelting molten steel:
After adding C content in the converter and be 3.92% molten iron 134.5t, lime 7.8t (the about 58kg of steel per ton), blow.Blowing adds the high magnesite 1.2t that contains MgO34.0% behind the 15min, and MgO is 11.0% in the control converter slag, increases the 1min tapping of blowing again behind the magnesite, and tapping C is 0.05%; Add the alloying that pitch coke, Fe-Si, Fe-Si-Mn, Fe-Cr carry out C, Si, Mn, Cr in the bearing steel in the tapping process, the add-on of each alloy is as the criterion in the scope that standard of high-carbon chromium hearing steel requires with control C, Si, Mn, Cr; Tapping process adds slag charge 920kg (the about 6.8kg of steel per ton) simultaneously, control (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.55.Ladle adopts the big flow Argon in bottom, and the Argon pressure-controlling is 0.4MPa, argon flow amount 20m
3/ h, Argon total time 12min; Change argon blowing rate 10m behind the big flow Argon 12min
3/ h continues the low discharge Argon, feeds Al line 400m (every meter 0.2kg adds up to 80kg) with feeding wire machine simultaneously, stops Argon immediately after the Al line has been fed, at this moment the α in the molten steel
[O]Be 5.6 * 10
-6, [Als] be 0.036%.
LF ladle refining furnace refined molten steel:
After the ladle that molten steel is housed is transported to LF electrically heated operation, in ladle, add slag charge 520kg (the about 3.86kg of steel per ton) once more, add slag charge after LF begin heating, heat 14min after, temperature stops heating when reaching 1560 ℃, get slag specimen analysis (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.51, during the electrically heated of LF stove, argon blowing rate is controlled to be 20m
3/ h.
Vacuum oven is handled molten steel:
After ladle arrives vacuum treatment installation, measure [Al
s] be 0.014%, 2min adds Al ball 10kg after the vacuum-treat, control [Al
s] be 0.024%; Vacuum tightness is 100Pa during vacuum-treat, and vacuum processing time is 13min.
Continuous casting steel:
Molten steel after the vacuum-treat is in the 6 stream billet caster top castings of 6 machines, and the strand transverse section is 280mm * 380mm, and measuring and wrapping temperature in the casting machine is 1475 ℃, and casting machine draws number to be 0.60m/min, two cold specific water 0.27L/kg, and crystallizer induction stirring electric current is 400A.
At last, by the requirement of GB11261-89 " high-carbon-chromium bearing steel chemical analysis-pulse heating indifferent gas fusion infrared absorption is measured the oxygen amount " standard, measure the T[O of this stove high-carbon-chromium bearing steel] be 6.5 * 10
-6
Embodiment 3:
The converter smelting molten steel:
After adding C content in the converter and be 3.88% molten iron 135.6t, lime 7.5t (the about 55kg of steel per ton), blow.Blowing adds the high magnesite 1.3t that contains MgO33.8% behind the 16min, and MgO is 11.6% in the control converter slag, increases the 1min tapping of blowing again behind the magnesite, and tapping C is 0.06%; Add the alloying that pitch coke, Fe-Si, Fe-Si-Mn, Fe-Cr carry out C, Si, Mn, Cr in the bearing steel in the tapping process, the add-on of each alloy is as the criterion in the scope that standard of high-carbon chromium hearing steel requires with control C, Si, Mn, Cr; Tapping process adds slag charge 960kg (the about 7.1kg of steel per ton) simultaneously, control (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.30.Ladle adopts the big flow Argon in bottom, and the Argon pressure-controlling is 0.4MPa, argon flow amount 20m
3/ h, Argon total time 12min; Change argon blowing rate 10m behind the big flow Argon 12min
3/ h continues the low discharge Argon, feeds Al line 500m (every meter 0.2kg adds up to 100kg) with feeding wire machine simultaneously, stops Argon immediately after the Al line has been fed, at this moment the α in the molten steel
[0]Be 5.8 * 10
-6, [Als] be 0.056%.
LF ladle refining furnace refined molten steel:
After the ladle that molten steel is housed is transported to LF electrically heated operation, in ladle, add slag charge 600kg (the about 4.4kg of steel per ton) once more, add slag charge after LF begin heating, behind the heating 13min, temperature stops when reaching 1565 ℃ heating, and gets slag specimen analysis (CaO+MgO)/(SiO
2+ Al
2O
3) be 1.35, during the electrically heated of LF stove, argon blowing rate is controlled to be 20m
3/ h.
Vacuum oven is handled molten steel:
After ladle arrives vacuum treatment installation, measure [Al
s] be 0.022%, vacuum degree control is 200Pa during vacuum-treat, vacuum processing time 13min.
Continuous casting steel:
Molten steel after the vacuum-treat is in the 6 stream billet caster top castings of 6 machines, and the strand transverse section is 280mm * 380mm, and measuring and wrapping temperature in the casting machine is 1470 ℃, and casting machine draws number to be 0.70m/min, two cold specific water 0.27L/kg, and crystallizer induction stirring electric current is 600A.
At last, by the requirement of GB11261-89 " high-carbon-chromium bearing steel chemical analysis-pulse heating indifferent gas fusion infrared absorption is measured the oxygen amount " standard, measure the T[O of this stove high-carbon-chromium bearing steel] be 8.2 * 10
-6
Claims (10)
1, revolving furnace continuous casting technology is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, this method may further comprise the steps: 1) smelting molten steel in converter: converter tapping steel per ton in the process of ladle adds the slag charge of 6.0～7.5kg, adopts the pressure of 0.4～0.6MPa to carry out Argon after having gone out steel; 2) in the ladle furnace refining: in ladle furnace refining, steel per ton adds the slag charge of 3.5～4.5kg once more, (CaO+MgO)/(SiO in the control slag
2+ Al
2O
3) be 1.0～2.0; 3) molten steel is carried out vacuum-treat: during the vacuum-treat, [the Al in the molten steel
s] be controlled at more than 0.015%; 4) casting on continuous caster.
2, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, during the described converter smelting of step 1, adds C content in the converter and blows greater than 3.0% molten iron.
3, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, during the described converter smelting of step 1, steel per ton adds 50～70kg lime.
4, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, during the described converter smelting of step 1, add the solid slag of MgO content 〉=25% in last 1～2 minute in blowing, the content that makes MgO in the converter slag is 10%～12%.
5, revolving furnace continuous casting technology as claimed in claim 4 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that described solid slag is that MgO content is 27%～38% high magnesite or rhombspar.
6, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, and during the described converter smelting of step 1, CaF in the control slag
2Be 3.0%～5.5%.
7, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, after the described Argon of step 1, with metal A l molten steel is carried out deoxidation, control α
[O]≤ 15 * 10
-6, [Al
s] be 0.020%～0.060%.
8, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, after the described slag charge of step 2 adds, heats with the electrode pair molten steel, stops heating when temperature is heated to 1545～1570 ℃.
9, revolving furnace continuous casting technology as claimed in claim 8 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that carry out Argon between described heating period, argon flow amount is controlled to be 18～30m
3/ h.
10, revolving furnace continuous casting technology as claimed in claim 1 is produced the method for low-oxygen high-carbon and high-chromium bearing steel, it is characterized in that, during the described vacuum-treat of step 3, vacuum degree control is below 300Pa, and vacuum processing time is controlled at more than the 12min.
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| CN105772665B (en) * | 2016-03-23 | 2018-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | The 34CrMo pipes steel billet and its method for refining of 350 ㎜ diameters |
| CN107457379B (en) * | 2017-07-26 | 2019-07-23 | 山东钢铁股份有限公司 | A kind of production method of high-carbon high-alloy bearing steel large round billet |
| CN113996772B (en) * | 2021-11-04 | 2023-06-16 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of 95Cr18 |
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| CN1414118A (en) * | 2002-06-26 | 2003-04-30 | 宝钢集团上海五钢有限公司 | Production method of small square billet continuous casting bearing steel |
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