CN103146883B - Smelting method for sulfur-containing low-oxygen gear steel - Google Patents

Smelting method for sulfur-containing low-oxygen gear steel Download PDF

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CN103146883B
CN103146883B CN201310115873.2A CN201310115873A CN103146883B CN 103146883 B CN103146883 B CN 103146883B CN 201310115873 A CN201310115873 A CN 201310115873A CN 103146883 B CN103146883 B CN 103146883B
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steel
molten steel
smelting
refining
sulfur
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CN103146883A (en
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张贤忠
韦泽宏
熊玉彰
陈子宏
陈庆丰
张青山
汪晛
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Baowu group Echeng Iron and Steel Co., Ltd
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Wuhan Iron and Steel Group Corp
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Abstract

The invention discloses a smelting method for sulfur-containing low-oxygen gear steel. The smelting method for the sulfur-containing low-oxygen gear steel comprises the following steps of after molten steel is smelted and alloyed in a primary smelting furnace, temperature is raised in a steel ladle refining furnace, and high-alkalinity refining slag is added for diffusion deoxidation; 2) molten steel subjected to diffusion deoxidation is subjected to deep deoxidation under the vacuum condition; and 3) molten steel subjected to the deep deoxidation is switched into the steel ladle refining furnace, low-alkalinity refining slag is added for refining for 3-5 minutes, and an S ladle core wire and an Si-Ca ladle core wire are fed into the molten steel to carry out soft blow. According to the technical step and condition of the smelting method disclosed by the invention, the oxygen content in high-grade hardenability gear steel can be lowered to be below 10*10<-6>, the sulfur content in the steel is precisely controlled to be 0.030-0.040%, and a purpose of prolonging the gear fatigue life and improving the cutting and processing capability is achieved. The smelting method for the sulfur-containing low-oxygen gear steel, which is disclosed by the invention, has the characteristics of simple technical route, low production cost, small energy consumption and strong maneuverability.

Description

The smelting process of sulfur-bearing hypoxemia Pinion Steel
Technical field
The invention belongs to technical field of metallurgical manufacturing, be specifically related to a kind of smelting process of sulfur-bearing hypoxemia Pinion Steel.
Background technology
Oxygen level has a great impact tool fatigue lifetime of gear, and the oxygen level of Japan to Cr, Cr-Mo, Cr-Ni-Mo carburizing alloy steel and the relation between fatigue lifetime were once done experiment, when oxygen level is from 25 × 10 -6drop to 10 × 10 -6when following, the increase that its fatigue lifetime can several times, China is to SCM420H, 20MnCr 5also carried out degassed and not degassed contrast experiment Deng introduction steel grade, confirmed that degassed Pinion Steel can improve more than 50% fatigue lifetime.
Because industrially developed country has advanced technical equipment and Technology, the oxygen level of its Pinion Steel is generally lower, on average in (10 ~ 15) × 10 -6.Approximately (30 ~ 40) × 10 of 20CrMnTi oxygen levels of China's electric furnace list refining -6, the Pinion Steel oxygen level approximately 25 × 10 that electric furnace+LF refining furnace is produced -6, after the vacuum-treat of VD stove, can reach 20 × 10 -6below.In order to adapt to the new demand of Pinion Steel, each steel mill is through technological transformation, and the Pinion Steel purity of production also reaches higher level, has greatly shortened the gap with world level.At present gear industry standard the oxygen level of pinion steel for vehicles is defined as≤20 × 10 -6, and much adopt the special steel producer of LF stove+VD stove or LF stove+RH stove refining treatment, can be by the Control for Oxygen Content of Pinion Steel 15 × 10 -6below.
Sulfide in steel is little on the fatigue lifetime impact of Pinion Steel, and along with the development of free-cutting pinion, in steel, the upper and lower limit of sulphur content has all been proposed to requirement, and sulphur content scope is narrower, is more conducive to control form and the distribution of sulfide.Therefore, quantity, form and the distribution of the development of Pinion Steel to steel medium sulphide content had higher requirement.
Application number is that 201010523392.1 Chinese invention patent discloses a kind of method of smelting free-cutting pinion steel, and the method comprises: in converter, molten iron is carried out to just refining, slag basicity keeps 3 ~ 4; Molten steel after just refining is tapped in ladle, to 20 ~ 30% processes, in ladle, add ferro-aluminum reductor in tapping, to 40 ~ 60% processes, in ladle, add first refining slag in tapping, make the S content in the molten steel after tapping reach 0.05 ~ 0.08%; Ladle is carried out to LF stove ladle refining, in LF stove ladle refining process, add second batch refining slag and deoxidation aluminum shot, make the S content in the molten steel after the refining of LF stove reach 0.02 ~ 0.025%, first refining slag is identical with second batch refining slag composition, the mass percent of composition is: CaO 70 ~ 80%, Al 2o 32 ~ 8%, MgO 0 ~ 5%, SiO 20 ~ 3%, Na 2o 3 ~ 5%, CaF 28 ~ 14%, R>=4.5, the Si-Ca line of 0.6 ~ 0.9kg/ ton molten steel is closed in ladle feeding from LF departures; Molten steel after LF stove ladle refining is carried out to RH vacuum refinement, argon blowing time 5 ~ 15min, intensity 0.8 ~ 1.5NL/ ton molten steel minute.The shortcoming of this method is that refining slag basicity is high, is unfavorable for improving the recovery rate of S in molten steel.
Application number is the production method that 200810014875.1 Chinese invention patent discloses a kind of Cr-Mn-Ti Pinion Steel.It is characterized in that adopting just refine-LF of electric furnace or converter stove refining-vacuum-treat-continuous casting-Rolling Production technique; reduce [0], [S] and inclusion content in molten steel at refining furnace; in vacuum oven, molten steel is carried out to vacuum-treat; vacuum tightness is less than 140Pa; vacuum time is 15 ~ 30min, then carries out protective casting and rolling.Its shortcoming be present method produce Pinion Steel in sulphur content be less than 0.010%, be unfavorable for machining and the working accuracy of Pinion Steel.
Application number is the production method that 200910146792.2 Chinese invention patent discloses a kind of Pinion Steel, the method comprises the half steel after vanadium extraction is added in converter and is smelted, the molten steel that smelting is obtained is added in ladle, under refining slag and reductor existence, carry out ladle furnace refining afterwards, then carry out vacuum-treat and continuous-casting of steel billet, this production method can obtain the Pinion Steel that total oxygen content is 11 ~ 15ppm.
The production method of the Pinion Steel more than providing is all unfavorable for the accurate control of the high-end Pinion Steel composition of hypoxemia (≤0.0010%) sulfur-bearing (0.030~0.040%).
Summary of the invention
The object of the invention is the deficiency for existing Pinion Steel production technology, a kind of oxygen level that can not only reduce in Pinion Steel is provided, can also accurately control the Pinion Steel smelting process of sulphur content.
Above-mentioned purpose is achieved through the following technical solutions:
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel is smelted and carries out after alloying through first furnace, speed with 4 ~ 6 DEG C/min in ladle refining furnace heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 25 ~ 30 minutes after temperature reaches 1590 ~ 1600 DEG C, in described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 55 ~ 60%, SiO 215 ~ 20%, Al 2o 310 ~ 15%, MgO 2 ~ 5%, MnO 2 ~ 5%, CaF 23 ~ 8%, surplus is impurity;
2) deep deoxidation under vacuum condition of the molten steel after diffusive deoxidation;
3) molten steel after deep deoxidation proceeds to ladle refining furnace and adds low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 3 ~ 5 minutes, feed the ratio of 0.35 ~ 0.45kg in molten steel per ton and feed S cored-wire in molten steel, having fed S cored-wire continues after 8 ~ 12 minutes feed Si-Ca cored-wire and carry out soft blow in molten steel, in described low basicity refining slag, the weight percent proportioning of each composition is: CaO 35 ~ 40%, SiO 235 ~ 40%, Al 2o 310 ~ 15%, MgO 2 ~ 5%, MnO 2 ~ 5%, CaF 23 ~ 8%, surplus is impurity.
Preferably, the basicity of described high alkalinity refining slag is 4.5 ~ 7, basicity≤2.5 of described low basicity refining slag.
Preferably, step 2) in, described vacuum condition is that pressure is the normal atmosphere of 6.5 ~ 7Pa, the time of described deep deoxidation is 12 ~ 15 minutes.
Further preferably, step 2) in, described vacuum condition is that pressure is the normal atmosphere of 6.8Pa.
Preferably, in step 3), feed the ratio of 0.5 ~ 1kg in molten steel per ton and feed Si-Ca cored-wire in molten steel.
In the smelting process of Pinion Steel, high alkalinity refining slag and vacuum-treat are conducive to oxygen content in steel and reduce rapidly, obtain the molten steel of high-cleanness, high, but reducing in oxygen level, sulphur content also reduces simultaneously, are unfavorable for the stable of sulphur content in steel; In addition, although low basicity refining slag can stabilized steel in sulphur content, be unfavorable for deoxidation, therefore, in the time producing hypoxemia sulfur-bearing Pinion Steel, there is low oxygen content and the stable but higher contradiction of oxygen level of sulphur content in the unstable or steel of sulphur content in steel.The present invention has solved above-mentioned contradiction effectively, by adopting processing step of the present invention and condition, can make the oxygen level in high-end hardenability pinion steel be reduced to 10 × 10 -6below, in steel, sulphur content is accurately controlled at 0.03 ~ 0.04%, reaches the object that improves gear fatigue life and improve machining ability.It is simple that the present invention simultaneously also has technique circuit, and production cost is low, and energy consumption is few, workable, is easy to the features such as control.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel heats up and pre-deoxidation in LF refining furnace: molten steel is smelted and carries out after alloying through first furnace, speed with 4 DEG C/min in ladle refining furnace (LF refining furnace) heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 25 minutes after temperature reaches 1590 ~ 1600 DEG C, then winches to molten steel VD vacuum degassing furnace station.
In described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 60%, SiO 215%, Al 2o 310%, MgO 5%, MnO 2%, CaF 28%; Basicity is 4.5.
2) deep deoxidation: carry out deep deoxidation in VD vacuum degassing furnace, the pumpdown time is 6 minutes (making normal atmosphere reach 6.8Pa), and the dwell time is 12 minutes.
3) molten steel adjusting component in LF refining furnace: molten steel is again got back to and carried out composition adjustment in LF refining furnace after vacuum deep deoxidation, first in molten steel, add low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 3 minutes, feed the ratio of 0.35kg in molten steel per ton and feed S cored-wire in molten steel, make the weight content of S in steel reach 0.03 ~ 0.04%, fed S cored-wire and continued feed Si-Ca cored-wire and carry out soft blow in molten steel in the ratio of molten steel per ton hello 1kg after 8 minutes.
In described low basicity refining slag, the weight percent proportioning of each composition is: CaO 35%, SiO 240%, Al 2o 315%, MgO 2%, MnO 2%, CaF 23%, surplus is impurity; Basicity is 2.5.
Embodiment 2
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel heats up and pre-deoxidation in LF refining furnace: molten steel is smelted and carries out after alloying through first furnace, speed with 6 DEG C/min in ladle refining furnace (LF refining furnace) heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 28 minutes after temperature reaches 1590 ~ 1600 DEG C, then winches to molten steel VD vacuum degassing furnace station.
In described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 58%, SiO 217%, Al 2o 313%, MgO 3%, MnO 3%, CaF 26%; Basicity is 7.
2) deep deoxidation: carry out deep deoxidation in VD vacuum degassing furnace, the pumpdown time is 8 minutes (making normal atmosphere reach 6.8Pa), and the dwell time is 15 minutes.
3) molten steel adjusting component in LF refining furnace: molten steel is again got back to and carried out composition adjustment in LF refining furnace after vacuum deep deoxidation, first in molten steel, add low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 5 minutes, feed the ratio of 0.4kg in molten steel per ton and feed S cored-wire in molten steel, make S content in steel reach 0.03 ~ 0.04%, fed S cored-wire and continued feed Si-Ca cored-wire and carry out soft blow in molten steel in the ratio of molten steel per ton hello 0.8kg after 12 minutes.
In described low basicity refining slag, the weight percent proportioning of each composition is: CaO 38%, SiO 237%, Al 2o 315%, MgO 2%, MnO 2%, CaF 25%, surplus is impurity; Basicity is 1.
Embodiment 3
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel heats up and pre-deoxidation in LF refining furnace: molten steel is smelted and carries out after alloying through first furnace, speed with 5 DEG C/min in ladle refining furnace (LF refining furnace) heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 26 minutes after temperature reaches 1590 ~ 1600 DEG C, then winches to molten steel VD vacuum degassing furnace station.
In described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 60%, SiO 216%, Al 2o 312%, MgO 4%, MnO 2%, CaF 24%, surplus is impurity; Basicity is 5.
2) deep deoxidation: carry out deep deoxidation in VD vacuum degassing furnace, the pumpdown time is 7 minutes (making normal atmosphere reach 6.5Pa), and the dwell time is 14 minutes.
3) molten steel adjusting component in LF refining furnace: molten steel is again got back to and carried out composition adjustment in LF refining furnace after vacuum deep deoxidation, first in molten steel, add low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 4 minutes, feed the ratio of 0.35kg in molten steel per ton and feed S cored-wire in molten steel, make S content in steel reach 0.03 ~ 0.04%, fed S cored-wire and continued feed Si-Ca cored-wire and carry out soft blow in molten steel in the ratio of molten steel per ton hello 0.7kg after 10 minutes.
In described low basicity refining slag, the weight percent proportioning of each composition is: CaO 36%, SiO 236%, Al 2o 315%, MgO 3%, MnO 2%, CaF 25%, surplus is impurity; Basicity is 2.
Embodiment 4
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel heats up and pre-deoxidation in LF refining furnace: molten steel is smelted and carries out after alloying through first furnace, speed with 5 DEG C/min in ladle refining furnace (LF refining furnace) heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 26 minutes after temperature reaches 1590 ~ 1600 DEG C, then winches to molten steel VD vacuum degassing furnace station.
In described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 56%, SiO 220%, Al 2o 310%, MgO 5%, MnO 2%, CaF 26%, surplus is impurity; Basicity is 6.
2) deep deoxidation: carry out deep deoxidation in VD vacuum degassing furnace, the pumpdown time is 6 minutes (making normal atmosphere reach 7Pa), and the dwell time is 15 minutes.
3) molten steel adjusting component in LF refining furnace: molten steel is again got back to and carried out composition adjustment in LF refining furnace after vacuum deep deoxidation, first in molten steel, add low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 4 minutes, feed the ratio of 0.38kg in molten steel per ton and feed S cored-wire in molten steel, make S content in steel reach 0.03 ~ 0.04%, fed S cored-wire and continued feed Si-Ca cored-wire and carry out soft blow in molten steel in the ratio of molten steel per ton hello 0.6kg after 10 minutes.
In described low basicity refining slag, the weight percent proportioning of each composition is: CaO 37%, SiO 237%, Al 2o 313%, MgO 5%, MnO 2%, CaF 26%; Basicity is 2.
Embodiment 5
A smelting process for sulfur-bearing hypoxemia Pinion Steel, comprises the following steps:
1) molten steel heats up and pre-deoxidation in LF refining furnace: molten steel is smelted and carries out after alloying through first furnace, speed with 5 DEG C/min in ladle refining furnace (LF refining furnace) heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 30 minutes after temperature reaches 1590 ~ 1600 DEG C, then winches to molten steel VD vacuum degassing furnace station.
In described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO 55%, SiO 220%, Al 2o 315%, MgO 5%, MnO 2%, CaF 23%; Basicity is 5.
2) deep deoxidation: carry out deep deoxidation in VD vacuum degassing furnace, the pumpdown time is 8 minutes (making normal atmosphere reach 6.8Pa), and the dwell time is 15 minutes.
3) molten steel adjusting component in LF refining furnace: molten steel is again got back to and carried out composition adjustment in LF refining furnace after vacuum deep deoxidation, first in molten steel, add low basicity refining slag, under 1590 ~ 1600 DEG C of conditions, refining is after 4 minutes, feed the ratio of 0.45kg in molten steel per ton and feed S cored-wire in molten steel, make S content in steel reach 0.030~0.040%, fed S cored-wire and continued feed Si-Ca cored-wire and carry out soft blow in molten steel in the ratio of molten steel per ton hello 0.5kg after 10 minutes.
In described low basicity refining slag, the weight percent proportioning of each composition is: CaO 40%, SiO 235%, Al 2o 315%, MgO 2%, MnO 5%, CaF 23%; Basicity is 2.
Oxygen level and the sulphur content of the hypoxemia sulfur-bearing Pinion Steel that embodiment 1 ~ 5 produces see the following form:
Embodiment [O]×10 -6 [S]%
Embodiment 1 7 0.035
Embodiment 2 8 0.034
Embodiment 3 9 0.036
Embodiment 4 7 0.038
Embodiment 5 10 0.040

Claims (5)

1. a smelting process for sulfur-bearing hypoxemia Pinion Steel, is characterized in that comprising the following steps:
1) molten steel is smelted and carries out after alloying through first furnace, speed with 4~6 DEG C/min in ladle refining furnace heats up, in temperature-rise period, in molten steel, add high alkalinity refining slag, diffusive deoxidation 25~30 minutes after temperature reaches 1590~1600 DEG C, in described high alkalinity refining slag, the weight percent proportioning of each composition is: CaO55~60%, SiO 215~20%, Al 2o 310~15%, MgO2~5%, MnO2~5%, CaF 23~8%, surplus is impurity;
2) deep deoxidation under vacuum condition of the molten steel after diffusive deoxidation;
3) molten steel after deep deoxidation proceeds to ladle refining furnace and adds low basicity refining slag, under 1590~1600 DEG C of conditions, refining is after 3~5 minutes, feed the ratio of 0.35~0.45kg in molten steel per ton and feed S cored-wire in molten steel, having fed S cored-wire continues after 8~12 minutes feed Si-Ca cored-wire and carry out soft blow in molten steel, in described low basicity refining slag, the weight percent proportioning of each composition is: CaO35~40%, SiO 235~40%, Al 2o 310~15%, MgO2~5%, MnO2~5%, CaF 23~8%, surplus is impurity.
2. the smelting process of sulfur-bearing hypoxemia Pinion Steel according to claim 1, is characterized in that: the basicity of described high alkalinity refining slag is 2.7~4, the basicity of described low basicity refining slag is 0.9~1.2.
3. according to the smelting process of sulfur-bearing hypoxemia Pinion Steel described in claim 1 or 2, it is characterized in that: step 2) in, described vacuum condition is that pressure is the normal atmosphere of 65~70Pa, the time of described deep deoxidation is 12~15 minutes.
4. the smelting process of sulfur-bearing hypoxemia Pinion Steel according to claim 3, is characterized in that: step 2) in, described vacuum condition is that pressure is the normal atmosphere of 68Pa.
5. according to the smelting process of sulfur-bearing hypoxemia Pinion Steel described in claim 1 or 2, it is characterized in that: in step 3), feed the ratio of 0.5~1kg in molten steel per ton and feed Si-Ca cored-wire in molten steel.
CN201310115873.2A 2013-04-03 2013-04-03 Smelting method for sulfur-containing low-oxygen gear steel Active CN103146883B (en)

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CN103555892B (en) * 2013-11-14 2015-02-25 山东西王特钢有限公司 New method for controlling alkalinity value of molten alloy steel slag system
CN106399640B (en) * 2016-09-19 2018-03-16 邢台钢铁有限责任公司 Control the method for refining of brittle inclusion in bearing steel

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