CN101701277A - Method for smelting steel round blank of air cylinder by convertor process - Google Patents
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Abstract
The invention belongs to the technical field of a smelting process of iron and steel, in particular to a method for smelting a continuous-casting round blank of a seamless steel tube used for an air cylinder by a convertor. In order to solve the defect of the steel of a steel air cylinder smelted by an electric arc furnace process, the invention provides a method for smelting a steel round blank used for a seamless steel tube used for a 30CrMo air cylinder by the processes of ironmaking in a blast furnace, processing in a convertor, LF refining, VD vacuum refining and continuous casting. The method concretely comprises the following steps: molten iron is preprocessed by a blowing particle magnesium desulfuration process, the convertor adopts top-bottom compound blowing, and an oxygen supply system with low oxygen pressure and large flow rate is used; LF refining adopts a high-alkalinity white slag refining process, white slag refining is carried out for 20-30 minutes, LF refining processing is carried out for 35-45 minutes, and the temperature of the molten steel reaching a VD refining station is 1615+/-5 DEG C; VD refining is kept for 10-15 minutes under the vacuum degree smaller than or equal to 67Pa, soft argon-blowing stirring is also adopted, the hydrogen content of the molten steel out of the VD station is controlled at 0-2ppm, and the temperature of the molten steel reaching a continuous casting platform is 1570+/-5 DEG C; and continuous casting adopts protective pouring, the superheating temperature of the molten steel is controlled at 20-40 DEG C, the pulling speed is 1.5-3.2m/min, and an electromagnetic stirring technology of a crystallizer is also used. By adopting the tube blank produced through the process, the purity of the molten steel is enhanced, injury caused by trace residual elements is lightened, and the performance of the air cylinder steel is enhanced.
Description
Technical field
The invention belongs to smelting iron and steel Technology field, particularly produce gas cylinder is used continuous cast round billets with weldless steel tube method with converter process.
Technical background
Gas cylinder is widely used in gas delivery and divides in the process of assembling, generally bears pressure range between 8-30MPa, reaches as high as 100MPa.So require gas cylinder should have very high cleanliness factor, have over-all propertieies such as good toughness, formability and solidity to corrosion simultaneously with steel.
The 30CrMo steel is a kind of gas cylinder steel of Cr-Mo series commonly used.Manufacturer adopts electric arc furnace explained hereafter 30CrMo gas cylinder steel mostly at present, and production technique is electric arc furnace → ladle refining → continuous casting.
The applicant passes through gas cylinder steel The Characteristic Study, in conjunction with possessing advanced tooling, research and development ability and production technology level, developed the technology that blast furnace ironmaking → top and bottom combined blown converter → LF ladle refining furnace → VD vacuum outgas → round billet continuous casting is produced 30CrMo gas cylinder steel.
Summary of the invention
The objective of the invention is to overcome electric arc furnace technology and smelt steel gas cylinder steel, has the difficult removal of harmful residual element Pb, Sn, As, Sb, Bi, particularly the nitrogen content in the steel difficulty reach lower level, realize high cleanliness molten steel and the higher relatively deficiency of smelting cost, provide a kind of and smelt gas cylinder is used steel round blank with weldless steel tube method with blast furnace ironmaking → top and bottom combined blown converter → LF ladle refining furnace → VD vacuum outgas → round billet continuous casting technology.Thereby improved the purity of molten steel, alleviated the harm that the micro residue element brings, improved the performance of gas cylinder steel.
The method of converter process smelting steel round blank of air cylinder of the present invention mainly realizes by following method.
30CrMo gas cylinder of the present invention with weldless steel tube with the composition of steel is: control composition (weight percentage) is: C=0.26-0.34%, Si=0.17-0.37%, Mn=0.40-0.70%, P≤0.030%, S≤0.030%, P+S≤0.055%, Cr=0.80-1.10%, Mo=0.15-0.25%, Ni≤0.30% Cu≤0.20%, Fe surplus.
The present invention optimizes composition (weight percentage): C=0.29-0.31%, Si=0.23-0.27%, Mn=0.53-0.57%, P≤0.020%, S≤0.010%, Cr=0.92-0.98%, Mo=0.19-0.21%, Fe surplus.
In addition, require (Pb+Sn+As+Sb+Bi)≤0.025% in the 30CrMo steel; Single-element Pb≤0.008%, all the other≤0.010%.
The method of converter process smelting steel round blank of air cylinder provided by the invention, wherein the main technique step is: blast furnace → top and bottom combined blown converter → LF refining furnace → VD vacuum oven → Ф 150mm-Ф 200mm round billet continuous casting machine → turn over cooling bed → check → warehouse-in.Concrete processing step content comprises:
1. blast-melted employing winding-up particle magnesium technology is carried out the desulfurization pre-treatment to molten iron, makes into the converter hot metal composition to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. the top and bottom complex blowing smelting that top blowing oxygen bottom blowing nitrogen or argon gas stir is adopted in converter, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow top oxygen supply system make converter tapping molten steel composition [C]=0.10-0.15%, [P]=0-0.010%;
3. adopt high basicity white slag refinery practice in the LF refining process, white slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute, in the refining process, omnidistance argon bottom-blowing stirs, and according to the gas flow that 3 kinds of patterns control of pre-blowing, bio-occlusion electricity, soft blow argon bottom-blowing stirs, controlling to the VD purified temperature of arriving at a station is 1615 ± 5 ℃;
4. in the VD refinery practice, the molten steel vacuum-treat will adopt the soft blow argon to stir at vacuum tightness≤67Pa 10-15 of following hold-time minute simultaneously, makes molten steel go out VD station hydrogen richness and is controlled at 0-2ppm, and the temperature that molten steel arrives the continuous casting platform is 1570 ± 5 ℃;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer, and molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.5-3.2m/min, uses the crystallizer electromagnetic agitating technology.
The method of described converter process smelting steel round blank of air cylinder is strengthened the slag making dephosphorization in preceding, the mid-term of converter smelting, the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing; Take the pushing off the slag tapping, control is quantity of slag 0-50mm down.
The method of described converter process smelting steel round blank of air cylinder, the molten steel composition span of control is [C]=0.29-0.31% in the LF refining process, [Si]=0.23-0.27%, [Mn]=0.53-0.57%, [S]=0-0.010%, [Cr]=0.92-0.98%, [Mo]=0.19-0.21%.
The method of described converter process smelting steel round blank of air cylinder after the vacuum-treat of VD refinery practice finishes, is fed the silico-calcium silk; After feeding the end of silico-calcium silk, carry out the soft blow operation, guarantee 5-10 minute soft blow time.
The method of described converter process smelting steel round blank of air cylinder, tundish adopts MgCa matter coating in continuous casting process, and barricade is set; Control simultaneously that the casting machine secondary cooling water distributes and the secondary cooling water specific water, make being distributed as a section and accounting for 33%, two section and account for 48%, three section and account for 19%, specific water 0.92-1.10L/Kg of water; To two cold specific water's controls, is 1.1L/Kg for Ф 150mm according to the casting blank specification difference; For Ф 160mm is 1.0L/Kg; For Ф 180mm is 0.95L/Kg; For Ф 200mm is 0.92L/Kg.Stablizing pulling rate according to the different size strand, is 2.5-3.2m/min for Ф 150mm; For Ф 160mm is 2.2-2.8m/min; For Ф 180mm is 1.8-2.3m/min; For Ф 200mm is 1.5-2.0m/min.
The invention has the advantages that with electric arc furnace technology and compare that the harmful residual element in the steel (Pb, Sn, As, Sb, Bi) content is lower, gas (the particularly nitrogen in the steel) content is few, and the molten steel high purity has improved the performance of gas cylinder steel; This technology rhythm is fast, the efficient height.This steel grade chemical Composition Control strictness, the supply of material is even by the gross, fluctuation is little; Adopt top bottom compound blowing technology, the oxygen supply of low pressure and mass flow oxygen rifle, blowing is steady, and terminal point composition and temperature shoot straight; In bag, add special-purpose synthetic slag during tapping, carry out wash heat, further desulfurization, removal is mingled with; LF, VD refining procedure are furnished with ladle whole process BOTTOM ARGON BLOWING and ladle wire feeding equipment, can the effective elimination steel in gas, guarantee that the composition adjustment is even, realize that inclusion modification handles, reduce inclusion content of steel, improve the molten steel purity; Adopt crystallizer induction stirring technology, tundish adopts MgCa matter coating, and barricade is set simultaneously, improves slab quality.Concrete implementing process step:
(1) raw material is taked the fine fodder principle, and blast-melted employing winding-up particle magnesium technology is carried out the desulfurization pre-treatment to molten iron, makes into the converter hot metal composition to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%.
(2) converter smelting: adopt top and bottom combined blown converter to realize the first refining of molten steel.Adopt top and bottom combined blown converter technology, strengthened in the smelting process the stirring in molten bath, promote the carrying out of various metallurgical reactions and temperature, composition evenly.Top and bottom combined blown converter adopts low oxygen pressure, big flow top oxygen gun oxygen supply, and it is that 0.8-0.85MPa, flow are 22800-23200m that oxygen is pressed
3/ h; The gas mixing of bottom blowing nitrogen/argon is mixed; Preceding, the medium profit of converter smelting is strengthened the slag making dephosphorization with the lower favourable condition of liquid steel temperature, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing; Take pushing off the slag tapping in the converter tapping process, control is quantity of slag 0-50mm down, prevents rephosphorization, improves yield of alloy and reduces non-metallic inclusion in the steel; (major ingredient is CaF to add synthetic slag charge in the tapping process in ladle
2, CaO) carry out wash heat, carry out the upgrading of ladle top slag simultaneously, further desulfurization goes to be mingled with; Take catch carbon practice, converter tapping target call molten steel [C]=0.10-0.15%, [P]=0-0.010%.
(3) LF refining: because this steel grade requires composition uniform and stable, fluctuation range is little between each heat; Simultaneously owing to require the gas cylinder steel to have the over-all properties of good toughness, formability and solidity to corrosion etc., to the kind and the content requirement strictness of steel inclusion, so the LF refining procedure is around adjusting and aspects such as the removal of evening chemical composition, nonmetallic inclusionsin steel, adjustment temperature are controlled.The span of control of molten steel chemical ingredients is in the LF refining process: [C]=0.27-0.34%, [Si]=0.18-0.35%, [Mn]=0.45-0.65%, [Cr]=0.85-1.05%, [Mo]=0.16-0.24%, [P]≤0.025%, [S]≤0.020%.
Its preferable range is: [C]=0.29-0.31%, [Si]=0.23-0.27%, [Mn]=0.53-0.57%, [Cr]=0.92-0.98%, [Mo]=0.19-0.21%, [P]≤0.020%, [S]≤0.010%.Controlling to the VD purified temperature of arriving at a station is 1615 ± 5 ℃.
Adopt high basicity white slag refinery practice in the refining process; Make the foaming white slag, stablize refining operation, white slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute.In the refining process, omnidistance argon bottom-blowing stirs, and according to the gas flow that pre-blowing, bio-occlusion electricity, 3 kinds of pattern control of soft blow argon bottom-blowing stir, guarantees the Argon effect.
(4) VD refining procedure: the molten steel vacuum-treat required at vacuum tightness≤67Pa 10-15 of following hold-time minute, adopted the soft blow argon to stir simultaneously, avoided turning over greatly, and gas in the effective elimination steel reduces inclusion content of steel; After vacuum-treat finishes, feed the CaSi silk, realize the sex change of nonmetallic inclusionsin steel and improve fluidity molten steel, guarantee carrying out smoothly of cast; After feeding the silk end, carry out pressure soft blow operation, guarantee 5-10 minute soft blow time, evenly the chemical ingredients and the temperature of steel promote the further removal of non-metallic inclusion; Guarantee that molten steel departures hydrogen richness is 0-2ppm; Temperature control, requiring the liquid steel temperature of arrival continuous casting platform is 1570 ± 5 ℃.
(5) continuous casting: Ф 150mm-Ф 200mm round billet continuous casting machine, for guaranteeing carrying out smoothly of slab quality and continuous casting, emphasis control the following aspects:
A. ladle takes whole process to add protective casing protection cast to tundish, tundish to crystallizer in the casting process, prevents secondary oxidation of steel, guarantees the purity of molten steel;
B. rationally control the casting machine secondary cooling water and distribute and the secondary cooling water specific water, guarantee that two cold refrigerative are even; Being distributed as one section and accounting for 33%, two section and account for 48%, three section and account for 19% of water; According to the different control ratio water yields of casting blank specification be: Ф 150mm: 1.10L/Kg, Ф 160mm: 1.0L/Kg, Ф 180mm:0.95L/Kg, Ф 200mm: 0.92L/Kg;
C. molten steel overheat is controlled in the 20-40 ℃ of scope, stable pulling rate is 1.5-3.2m/min, is 2.5-3.2m/min according to the preferable range Ф 150mm of different size pulling rate, and Ф 160mm is 2.2-2.8m/min, Ф 180mm is 1.8-2.3m/min, and Ф 200mm is 1.5-2.0m/min;
D. tundish is provided with barricade, removes to promote inclusion floating.The tundish coating adopts the MgCa material, and what alleviate that the tundish refractory corrosion brings is mingled with pollution to molten steel;
E. use the crystallizer induction stirring, guarantee strand crystal structure densification, even, reduce strand column crystal rate, avoid defectives such as strand crackle, shrinkage cavity.
Embodiment
Embodiment 1
(1) goes into the stove molten iron: [Si]=0.45%, [P]=0.070%, [S]=0.028%.
(2) converter smelting:
Smelt steel grade 30CrMo, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, and it is that 0.8MPa, flow are 23000m that bottom blowing nitrogen/argon gas, oxygen are pressed
3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, tapping [C]=0.11%, [P]=0.009%; Converter tapping adopts pushing off the slag tapping, following slag thickness 40mm.In ladle, add special-purpose synthetic slag charge 400kg in the tapping process.
(3) LF refining
Composition Control: [C]=0.30%, [Si]=0.24%, [Mn]=0.56%, [Cr]=0.95%, [Mo]=0.19%, [P]=0.016%, [S]=0.005%; White slag refining time 21 minutes; The refining out-station temperature is controlled to be 1612 ℃, 38 minutes LF refining treatment time.
(4) VD refining procedure
Kept 10 minutes during molten steel vacuum-treat vacuum tightness 60Pa, 0.20MPa pressure Argon stirs simultaneously; The departures hydrogen richness is 1.2ppm; Feed CaSi filament length 150m, improve fluidity molten steel and inclusion modification and handle; After feeding the end of CaSi silk, soft blow operation 9 minutes; Adjust arrive at a station 1572 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 150mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.10L/Kg;
C. the superheating temperature of molten steel is 25 ℃, pulling rate 3.0m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 2
(1) goes into the stove molten iron: [Si]=0.50%, [P]=0.075%, [S]=0.025%.
(2) converter smelting
Smelt steel grade 30CrMo, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, and it is that 0.82MPa, flow are 22900m that argon bottom-blowing, oxygen are pressed
3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, tapping [C]=0.12%, [P]=0.010%; Converter tapping adopts pushing off the slag tapping, following slag thickness 45mm.In ladle, add special-purpose synthetic slag charge 300kg simultaneously in the tapping process.
(3) LF refining
Composition Control: [C]=0.30%, [Si]=0.26%, [Mn]=0.53%, [Cr]=0.97%, [Mo]=0.20%, [P]=0.018%, [S]=0.005%; White slag refining time 23 minutes; The refining out-station temperature is controlled to be 1614 ℃, 35 minutes LF refining treatment time.
(4) VD refining procedure
Kept 12 minutes during molten steel vacuum-treat vacuum tightness 65Pa, 0.23MPa pressure Argon stirs simultaneously; The departures hydrogen richness is 1.5ppm; Feed CaSi filament length 135m; After feeding the end of CaSi silk, soft blow operation 8 minutes; Adjust arrive at a station 1567 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 160mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 1.00L/Kg;
C. the superheating temperature of molten steel is 28 ℃, pulling rate 2.6m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 3
(1) goes into the stove molten iron: [Si]=0.55%, [P]=0.067%, [S]=0.026%.
(2) converter smelting
Smelt steel grade 30CrMn, top end 22900m
3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice then, tapping [C]=0.12%, [P]=0.007%; Converter tapping adopts pushing off the slag tapping, following slag thickness 35mm.In ladle, add special-purpose synthetic slag charge 400kg simultaneously in the tapping process.
(3) LF refining Composition Control: [C]=0.31%, [Si]=0.26%, [Mn]=0.54%, [Cr]=0.95%, [Mo]=0.195%, [P]=0.020%, [S]=0.008%; White slag refining time 25 minutes; The refining out-station temperature is 1618 ℃, 40 minutes LF refining treatment time.
(4) VD refining procedure
Kept 13 minutes during molten steel vacuum-treat vacuum tightness 62Pa, 0.18MPa pressure Argon stirs simultaneously; The departures hydrogen richness is 1.2ppm; Feed CaSi filament length 140m; After feeding the end of CaSi silk, soft blow operation 10 minutes; Adjust arrive at a station 1572 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 180mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 0.95L/Kg;
C. the superheating temperature of molten steel is 28 ℃, pulling rate 2.1m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Embodiment 4
(1) goes into the stove molten iron: [Si]=0.60%, [P]=0.065%, [S]=0.025%.
(2) converter smelting
Smelt steel grade 30CrMo, top and bottom combined blown converter adopts the oxygen supply of low pressure and mass flow oxygen rifle, and it is that 0.85MPa, flow are 23000m that argon bottom-blowing, oxygen are pressed
3/ h, P is taken off in preceding, slag making in mid-term, and S is taken off in the intermediary and later stages slag making, takes catch carbon practice, tapping [C]=0.11%, [P]=0.006%; Converter tapping adopts pushing off the slag tapping, following slag thickness 30mm.In ladle, add special-purpose synthetic slag charge 450kg simultaneously in the tapping process.
(3) LF refining
Composition Control: [C]=0.31%, [Si]=0.25%, [Mn]=0.57%, [Cr]=0.99%, [Mo]=0.21%, [P]=0.017%, [S]=0.007%; White slag refining time 23 minutes; The refining out-station temperature is controlled to be 1617 ℃.38 minutes LF refining treatment time.
(4) VD refining procedure
Kept 12 minutes during molten steel vacuum-treat vacuum tightness 65Pa, 0.22MPa pressure Argon stirs simultaneously; The departures hydrogen richness is 1.5ppm; Feed CaSi filament length 160m; After feeding the end of CaSi silk, soft blow operation 6 minutes; Adjust arrive at a station 1569 ℃ of temperature of continuous casting.
(5) continuous casting working procedure: casting blank section Ф 200mm
A. the big tundish, tundish of wrapping of continuous casting takes whole process to add protective casing protection cast to crystallizer;
B. the casting machine secondary cooling water distributes and the secondary cooling water specific water, and one section accounts for 33%, two section and accounts for 48%, three section and account for 19%, specific water 0.92L/Kg;
C. the superheating temperature of molten steel is 27 ℃, pulling rate 1.9m/min;
D. tundish is provided with barricade;
E. use the crystallizer induction stirring.
Claims (7)
1. the invention provides the method for converter process smelting steel round blank of air cylinder, the main technique step for main technique step wherein is: blast-melted pre-treatment → converter smelting → LF refining furnace → VD vacuum oven refining → continuous caster is cast Ф 150mm-Ф 200mm circle base → through turn over cooling bed → check → warehouse-in; It is characterized in that:
1. blast-melted employing winding-up particle magnesium technology is carried out the desulfurization pre-treatment to molten iron, makes into the converter hot metal composition to reach [Si]=0.30-0.85%, [P]=0-0.080%, [S]=0-0.030%;
2. the top and bottom complex blowing smelting that top blowing oxygen bottom blowing nitrogen or argon gas stir is adopted in converter, and employing oxygen pressure is 22800-23200m for 0.8-0.85MPa, flow
3The low oxygen pressure of/h, big flow top oxygen supply system make converter molten steel go out steel constitution [C]=0.10-0.15%, [P]=0-0.010%;
3. adopt high basicity white slag refinery practice in the LF refining process, make the foaming white slag in the refining process, white slag refining time 20-30 minute, the LF refining treatment time was at 35-45 minute, in the refining process, omnidistance argon bottom-blowing stirs, and according to the gas flow that pre-blowing, bio-occlusion electricity, 3 kinds of patterns control of soft blow argon bottom-blowing stir, and controlling to the VD purified temperature of arriving at a station is 1615 ± 5 ℃;
4. in the VD refinery practice, the molten steel vacuum-treat will adopt the soft blow argon to stir at vacuum tightness≤67Pa 10-15 of following hold-time minute simultaneously, makes molten steel go out VD station hydrogen richness and is controlled at 0-2ppm, and the temperature that molten steel arrives the continuous casting platform is 1570 ± 5 ℃;
5. continuous casting process requires ladle to take whole process to add protective casing protection cast to tundish, tundish to crystallizer, and molten steel overheat is controlled in the 20-40 ℃ of scope, and stable pulling rate is 1.5-3.2m/min, uses the crystallizer electromagnetic agitating technology.
2. the method for converter process smelting steel round blank of air cylinder according to claim 1 is characterized in that strengthen the slag making dephosphorization preceding, the mid-term of converter smelting, and the phosphorus in the intermediary and later stages stabilizing slag is also realized molten steel desulfurizing; Take the pushing off the slag tapping, control is quantity of slag 0-50mm down.
3. as the method for converter process smelting steel round blank of air cylinder as described in claim 1 or 3, it is characterized in that the molten steel composition span of control is [C]=0.29-0.31% in the described LF refining process, [Si]=0.23-0.27%, [Mn]=0.53-0.57%, [S]=0-0.010%, [Cr]=0.92-0.98%, [Mo]=0.19-0.21%.
4. according to the method for the described converter process smelting steel round blank of air cylinder of claim 1, it is characterized in that after the vacuum-treat of VD refinery practice finishes, feeding the silico-calcium silk; After feeding the end of silico-calcium silk, carry out the soft blow operation, guarantee 5-10 minute soft blow time.
5. the method for converter process smelting steel round blank of air cylinder according to claim 1 is characterized in that tundish adopts MgCa matter coating in continuous casting process, and barricade is set; Control simultaneously that the casting machine secondary cooling water distributes and the secondary cooling water specific water, make being distributed as a section and accounting for 33%, two section and account for 48%, three section and account for 19%, specific water 0.92-1.10L/Kg of water.
6. as the method for converter process smelting steel round blank of air cylinder as described in claim 1 or 5, it is characterized in that in the described round billet continuous casting technology, to two cold specific waters' controls, is 1.1L/Kg for Ф 150mm according to the casting blank specification difference; For Ф 160mm is 1.0L/Kg; For Ф 180mm is 0.95L/Kg; For Ф 200mm is 0.92L/Kg.
7. as the method for converter process smelting steel round blank of air cylinder as described in claim 1 or 5, it is characterized in that stablizing pulling rate according to the different size strand in the described round billet continuous casting technology is, is 2.5-3.2m/min for Ф 150mm; For Ф 160mm is 2.2-2.8m/min; For Ф 180mm is 1.8-2.3m/min; For Ф 200mm is 1.5-2.0m/min.
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| CN105331885A (en) * | 2015-10-09 | 2016-02-17 | 天津钢铁集团有限公司 | Production method of 37 Mn round billets for air cylinders |
| CN105695658A (en) * | 2016-03-23 | 2016-06-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling equiaxial crystal ratio of phi-280mm 30CrMo circular tube blank |
| CN105728678A (en) * | 2016-03-23 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Center porosity control method for 30CrMo circular tube blank with diameter of section being phi 280 mm |
| CN105772666A (en) * | 2016-03-23 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Center segregation control method for 30 CrMo circular tube blank and steel casting blank |
| CN105803152A (en) * | 2016-03-23 | 2016-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Center porosity control method for 30CrMo round blooms and steel casting blooms |
| CN106756435A (en) * | 2016-12-23 | 2017-05-31 | 首钢总公司 | A kind of smelting process of welding wire steel |
| CN110512134A (en) * | 2019-08-23 | 2019-11-29 | 石钢京诚装备技术有限公司 | A kind of smelting process of 4130 steel of petroleum machinery valve body |
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN115323109A (en) * | 2022-07-14 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Control method for continuous casting center cracks of small steel square billets for large-size and high-niobium-content steel bars |
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2009
- 2009-11-25 CN CN200910228720A patent/CN101701277A/en active Pending
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| CN101928874A (en) * | 2010-07-30 | 2010-12-29 | 天津钢铁集团有限公司 | Method for smelting steel round billet for automobile axle shaft sleeve by using converter process |
| CN102277534A (en) * | 2011-07-29 | 2011-12-14 | 攀钢集团有限公司 | Hot rolled steel section for gas cylinders and production method thereof |
| CN102277534B (en) * | 2011-07-29 | 2012-12-12 | 攀钢集团有限公司 | Hot rolled steel section for gas cylinders and production method thereof |
| CN103131963A (en) * | 2013-03-22 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Low-temperature seamless steel pipe material and preparation method thereof |
| CN103131963B (en) * | 2013-03-22 | 2016-01-13 | 内蒙古包钢钢联股份有限公司 | The low temperature preparation method of weldless steel tube material |
| CN103555881A (en) * | 2013-11-04 | 2014-02-05 | 洛阳双瑞特种装备有限公司 | Manufacturing method of steel ingot for gas cylinder |
| CN103555881B (en) * | 2013-11-04 | 2015-04-22 | 洛阳双瑞特种装备有限公司 | Manufacturing method of steel ingot for gas cylinder |
| CN105331885A (en) * | 2015-10-09 | 2016-02-17 | 天津钢铁集团有限公司 | Production method of 37 Mn round billets for air cylinders |
| CN105772666A (en) * | 2016-03-23 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Center segregation control method for 30 CrMo circular tube blank and steel casting blank |
| CN105728678A (en) * | 2016-03-23 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Center porosity control method for 30CrMo circular tube blank with diameter of section being phi 280 mm |
| CN105695658A (en) * | 2016-03-23 | 2016-06-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling equiaxial crystal ratio of phi-280mm 30CrMo circular tube blank |
| CN105803152A (en) * | 2016-03-23 | 2016-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Center porosity control method for 30CrMo round blooms and steel casting blooms |
| CN105695658B (en) * | 2016-03-23 | 2018-05-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The 30CrMo circular pipe blank equiaxial crystal ratio control methods of φ 280mm |
| CN105803152B (en) * | 2016-03-23 | 2018-06-29 | 攀钢集团攀枝花钢铁研究院有限公司 | The center porosity control method of 30CrMo circular pipe blank steel strands |
| CN106756435A (en) * | 2016-12-23 | 2017-05-31 | 首钢总公司 | A kind of smelting process of welding wire steel |
| CN110512134A (en) * | 2019-08-23 | 2019-11-29 | 石钢京诚装备技术有限公司 | A kind of smelting process of 4130 steel of petroleum machinery valve body |
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN112501488B (en) * | 2020-10-22 | 2021-10-26 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN115323109A (en) * | 2022-07-14 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Control method for continuous casting center cracks of small steel square billets for large-size and high-niobium-content steel bars |
| CN115323109B (en) * | 2022-07-14 | 2024-01-30 | 包头钢铁（集团）有限责任公司 | Control method for continuous casting center cracks of steel billets for large-specification and high-niobium-content steel bars |
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