CN112458304A - Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel - Google Patents
Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel Download PDFInfo
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- CN112458304A CN112458304A CN202011200946.4A CN202011200946A CN112458304A CN 112458304 A CN112458304 A CN 112458304A CN 202011200946 A CN202011200946 A CN 202011200946A CN 112458304 A CN112458304 A CN 112458304A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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Abstract
The invention discloses an electroslag remelting slag system for smelting ultralow-carbon low-aluminum high-titanium maraging steel, and aims to realize uniform and consistent aluminum and titanium contents on the upper and lower parts of a steel ingot and control the contents of other impurity elements by selecting a slag system and a production process suitable for the ultralow-carbon low-aluminum high-titanium maraging steel under an electroslag protective atmosphere condition. The invention adopts protective atmosphere electroslag smelting, the slag system raw material consists of fluorite powder, alumina powder, lime and silicon oxide, and the mixture ratio is CaF: al (Al)2O3：CaO：SiO260% -70%: 25% -30%: 5% -10%: 0.1 to 1 percent. The invention has the following advantages: the electroslag remelting slag has reasonable components, stable slag system in the using process, good uniformity and consistency of the aluminum and titanium contents on the upper part, the middle part and the lower part of the produced steel ingot, and low silicon content of impurity elements, and meets the requirement of controlling aluminum elements in narrow gaps.
Description
Technical Field
The invention belongs to the technical field of special smelting, and relates to an electroslag remelting slag system for smelting ultra-low-carbon, low-aluminum and high-titanium maraging steel.
Background
The ultra-low carbon low aluminum high titanium maraging steel is iron-nickel alloy taking carbon-free (or micro-carbon) martensite as a matrix, and different contents of cobalt, molybdenum, aluminum and titanium elements are added, so that special steel with different strength grades is obtained. The steel comprises the following chemical components in percentage by mass: carbon not greater than 0.015, nickel: 17.5-19.0, cobalt: 8.0-9.0, molybdenum: 4.8-5.2, aluminum: 0.05 to 0.15, titanium: 0.60-0.90 percent, manganese is not more than 0.10 percent, silicon is not more than 0.12 percent, sulfur is not more than 0.010 percent, phosphorus is not more than 0.012 percent, chromium is not more than 0.10 percent, and the balance is iron and inevitable impurities; the aluminum-titanium alloy contains two elements of aluminum and titanium, the content of aluminum is low, the control range is narrow, and the content of titanium is high; silicon element is a serious limitation because it is a relatively harmful impurity to steel. The steel grade adopts an electroslag remelting smelting mode, and the slag system used for electroslag remelting production at present in China mainly takes a binary slag system and a ternary slag system as main materials, wherein the binary slag system generally refers to CaF: al (Al)2O370%: 30 percent; the ternary slag system is CaF2-CaO-Al2O3The slag system has moderate viscosity and is widely used. However, the above electroslag slag system composition is not suitable for the maraging steel with ultra-low carbon, low aluminum and high titanium, mainly because of the difference of the oxidation degree of aluminum and titanium in the slag system, when electroslag remelting is carried out in protective atmosphere, smelting is causedThe aluminum increasing and burning loss titanium elements of the steel ingot at the initial stage are obvious, the aluminum burning loss at the later stage is obvious, the aluminum and titanium elements at the head, middle and tail parts of the steel ingot are extremely unevenly distributed, and the performance inconsistency after the later-stage heat treatment causes great damage to the use of finished products.
Disclosure of Invention
The invention discloses an electroslag remelting slag system for smelting ultralow-carbon low-aluminum high-titanium maraging steel, and aims to realize uniform and consistent aluminum and titanium contents on the upper and lower parts of a steel ingot and control the contents of other impurity elements by selecting a slag system and a production process suitable for the ultralow-carbon low-aluminum high-titanium maraging steel under an electroslag protective atmosphere condition.
The specific technical scheme is as follows:
the protective atmosphere electroslag remelting slag is a quaternary slag system, the quaternary slag system comprises raw materials of fluorite powder, alumina powder, lime and silicon oxide, and the raw materials are proportioned according to the weight percentage of the components: and (2) CaF: al (Al)2O3：CaO：SiO260% -70%: 25% -30%: 5% -10%: 0.1 to 1 percent; calcium fluoride in the fluorite powder is not less than 98%, aluminum oxide in the aluminum oxide is not less than 98%, calcium oxide in the lime is not less than 95%, and silicon oxide in the silicon oxide raw material is not less than 98%.
The calcium fluoride mainly reduces the melting point, viscosity and surface tension of the slag, improves the fluidity of the slag, enables the slag to be well separated from molten steel, promotes desulfurization and dephosphorization, and has insufficient capability of removing impurities in the steel if the content of the calcium fluoride is lower than 60%; if the content of calcium fluoride is higher than 70 percent, the viscosity of slag liquid is low, so that the surface of the steel ingot is defective, and the calcium fluoride component is selected from 60 to 70 percent.
The aluminum oxide mainly improves the resistance of the slag system, increases the viscosity of the slag system, and obviously promotes the burning loss of titanium content in the electroslag process if the aluminum oxide is higher than 30 percent; if the resistance of the slag system is too low when the content of the alumina is lower than 25%, the power consumption is increased, so that the content of the alumina is selected to be 25-30%.
The calcium oxide has little influence on the viscosity of a slag system, but can greatly increase the alkalinity of slag and improve the desulfurization efficiency, and if the calcium oxide is higher than 10 percent, the calcium oxide has strong water absorption rate and is easy to bring hydrogen and oxygen, so that the hydrogen and oxygen increase of steel ingots are caused, and the level of inclusions is influenced; if the content of calcium oxide is less than 5%, the desulfurization effect of electroslag remelting cannot be ensured, so that the calcium oxide is selected from 5-10%.
The silicon oxide mainly reduces the alkalinity of the slag, improves the resistance of a slag system and improves the oxidability of the slag system, and if the silicon oxide is lower than 0.1 percent, the aluminum increase at the tail part of a steel ingot seriously exceeds the standard; if the silicon oxide is higher than 1 percent, the burning loss of Ti element at the tail part of the steel ingot is serious, and the phenomenon of silicon increase occurs, so that the component of the silicon oxide is selected from 0.1 to 1 percent.
The invention has the following advantages:
the electroslag remelting slag has reasonable components, stable slag system in the using process, good uniformity and consistency of the aluminum and titanium contents on the upper part, the middle part and the lower part of the produced steel ingot, and low silicon content of impurity elements, and meets the requirement of controlling aluminum elements in narrow gaps.
Detailed Description
The present invention will be described in detail with reference to the following specific examples:
the weight percentages of the components of the slag system in examples 1 and 2 are shown in table 1.
TABLE 1
| Examples | CaF2 | Al2O3 | CaO | SiO2 |
| 1 | 62.8 | 27 | 10 | 0.2 |
| 2 | 65 | 25 | 9.7 | 0.3 |
Firstly, a consumable electrode used for electroslag remelting is produced by adopting a vacuum induction furnace, the specification of the electrode is phi 430mm, and the weight percentage of the chemical components of the electrode meets the requirements of table 2.
TABLE 2
Secondly, the total weight of the slag is 100kg, and the blended quaternary slag system is placed into a feeder of the protective atmosphere electroslag furnace;
thirdly, before arc striking, the electroslag furnace is filled with argon for 5m3H, adopting the steel base pad to start arc, adding slag into a crystallization period within 20-30 min after the arc is started, and starting electroslag remelting;
and fourthly, directly discharging the electroslag ingot from the furnace for air cooling and sampling after the electroslag ingot is cooled in the furnace for 60min, wherein the specification of the electroslag ingot is phi 576 mm.
Effect verification:
the aluminum, titanium and silicon are sampled and analyzed at 4 points equally along the longitudinal direction of the electroslag ingot, and the weight percentages of chemical components are shown in table 3.
TABLE 3
Claims (2)
1. Electric furnace for smelting ultra-low carbon, low aluminum and high titanium maraging steelThe slag system for remelting slag is characterized in that the slag system is prepared from fluorite powder, alumina powder, lime and silicon oxide, wherein the raw materials comprise the following components in percentage by weight: al (Al)2O3：CaO：SiO2＝60％～70％：25％～30％：5％～10％：0.1％～1％。
2. The electroslag remelting slag system for smelting ultralow-carbon, low-aluminum and high-titanium maraging steel according to claim 1, wherein the four-element slag system is prepared from fluorite powder, alumina powder, lime and silicon oxide, calcium fluoride in the fluorite powder is not less than 98%, aluminum oxide in the alumina powder is not less than 98%, calcium oxide in the lime is not less than 95%, and silicon oxide in the silicon oxide raw material is not less than 98%.
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| CN202011200946.4A CN112458304A (en) | 2020-11-02 | 2020-11-02 | Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel |
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| CN202011200946.4A CN112458304A (en) | 2020-11-02 | 2020-11-02 | Electroslag remelting slag system for smelting ultra-low-carbon low-aluminum high-titanium maraging steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444892A (en) * | 2021-06-23 | 2021-09-28 | 石钢京诚装备技术有限公司 | Electroslag remelting production method of high-silicon steel |
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| CN104212977A (en) * | 2014-09-15 | 2014-12-17 | 洛阳双瑞特种装备有限公司 | Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab |
| CN105936978A (en) * | 2016-06-24 | 2016-09-14 | 东北大学 | Slag system for preparing high-nitrogen austenitic stainless steel through pressurizing electroslag remelting gas phase nitriding |
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| CN110358930A (en) * | 2019-08-13 | 2019-10-22 | 哈尔滨威尔焊接有限责任公司 | A kind of method of the electro slag remelting slag that sulphur can be protected and electroslag remelting |
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2020
- 2020-11-02 CN CN202011200946.4A patent/CN112458304A/en active Pending
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| JPH1119795A (en) * | 1997-06-27 | 1999-01-26 | Sumikin Yosetsu Kogyo Kk | Fused flux for submerged arc welding |
| JPH1190596A (en) * | 1997-09-25 | 1999-04-06 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting of steel |
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| CN104212977A (en) * | 2014-09-15 | 2014-12-17 | 洛阳双瑞特种装备有限公司 | Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab |
| CN105936978A (en) * | 2016-06-24 | 2016-09-14 | 东北大学 | Slag system for preparing high-nitrogen austenitic stainless steel through pressurizing electroslag remelting gas phase nitriding |
| CN108342587A (en) * | 2018-04-10 | 2018-07-31 | 抚顺特殊钢股份有限公司 | A kind of stainless Blade Steel electroslag remelting slag |
| CN110408741A (en) * | 2019-07-30 | 2019-11-05 | 上海电气上重铸锻有限公司 | Steel refining slag system formula |
| CN110358930A (en) * | 2019-08-13 | 2019-10-22 | 哈尔滨威尔焊接有限责任公司 | A kind of method of the electro slag remelting slag that sulphur can be protected and electroslag remelting |
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| GUO-HUA ZHANG等: ""Viscosity and Structure Changes of CaO-SiO2-Al2O3-CaF2 Melts with Substituting Al2O3 for SiO2"", 《JOURANL OF IRON AND STEEL RESEARCH, INTERNATIONAL》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113444892A (en) * | 2021-06-23 | 2021-09-28 | 石钢京诚装备技术有限公司 | Electroslag remelting production method of high-silicon steel |
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