CN103160726A - Carbon-iron alloy for recarburization and manufacture method thereof - Google Patents
Carbon-iron alloy for recarburization and manufacture method thereof Download PDFInfo
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- CN103160726A CN103160726A CN2013100668475A CN201310066847A CN103160726A CN 103160726 A CN103160726 A CN 103160726A CN 2013100668475 A CN2013100668475 A CN 2013100668475A CN 201310066847 A CN201310066847 A CN 201310066847A CN 103160726 A CN103160726 A CN 103160726A
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Abstract
The invention discloses a carbon-iron alloy for vacuum induction furnace smelting testing steel recarburization and a manufacture method thereof, and belongs to the technical field of ferrous metallurgy. The carbon-iron alloy is manufactured by raw materials including high-carbon steel scrap, graphite blocks, SiCa alloy and auxiliary materials. The raw materials are prepared and weighted according to requirements of weight percentage. Firstly, the graphite blocks and the high-carbon steel scrap are placed inside a vacuum intermediate frequency induction furnace crucible to be melted in a vacuum mode. When silicon barium calcium is completely deoxidized, the auxiliary materials and the SiCa alloy which are prepared and weighted according to the requirements of the weight percentage are added into liquid steel inside the crucible. After the SiCa alloy and the auxiliary materials are melted and mixed evenly, the liquid steel is poured into an ingot mold to be completely cooled. After mold sinking and demolding, the carbon-iron alloy ingot is formed. The carbon-iron alloy ingot is quenched and is cut into a carbon-iron alloy block with the size of 10mm*10mm*50mm-300mm through a saw, and the carbon-iron alloy block is used for the vacuum induction furnace smelting testing steel recarburization.
Description
One, affiliated technical field
The invention belongs to technical field of ferrous metallurgy, be specifically related to carbon-iron alloy and manufacture method that the carburetting of a kind of vacuum induction furnace smelting experimental steel is used.
Two, background technology
China is the big steel country of World Steel output first, but rolling shapes, quality and Foreign Advanced Lerel also have sizable gap, still has a considerable amount of steel to need import.
Modern steel product R﹠D process, the research staff expects to use the hundreds of kilogram, tens kilograms, even the sample of tens kilogram weights replaces tens of tons of steel billet, need build and rely on so small-scale smelting to roll the pilot experiment innovation platform and carry out new-product development, with small sample, under the strict experiment condition of controlling, simulate the smelting of industrial condition and roll pilot experiment.
Roll by smelting the test simulation that the pilot experiment innovation platform is carried out smelting, hot rolling, cold rolling and deep processing operation, not only can effectively avoid risk, accomplish that research and development of products is low-cost, high-level efficiency, also help and carry out forward position, great, general character, basic technology research in a deep going way, the ability that promotes original innovation, integrated innovation and assimilate advanced foreign technologies and further refine them is made a collection of core technology and key product conscientiously.
The pilot experiment innovation platform is rolled in smelting, mainly partly consisted of by steel-making, steel rolling, aftertreatment etc., it is multi-functional, combined pilot experiment research equipment, simulation and reproduction modernization are smelted, rolling and deep-processing process, the pilot scale research platform that surmounts the existing operation of rolling, be the exploitation analog rolling plate tensile sample of " plate, pipe, rail, line " steel product innovation, guarantee controllability and the reliability of rolling technique, equipment and research and development of products experimental result.
Smelting is rolled the pilot experiment innovation platform iron and steel enterprise's Production Flow Chart optimization, product up-gradation and market competitiveness raising is played important basic supporting role, this be in iron and steel enterprise's scientific and technical innovation one have universality, basic work, also the general character research topic concerning iron and steel enterprise's efficient, quality, cost, significant to the competitive power that improves enterprise.
In smelting process, due to batching or feed improper and the reason such as decarburization is excessive, sometimes cause carbon content in steel or iron not reach the requirement of expection, at this moment will be to carburetting in steel or iron liquid.The essential substance that is commonly used to carburetting has pulverized anthracite, the carburetting pig iron, electrode powder, petroleum coke powder, pitch coke, wood charcoal powder and coke powder.Requirement to carburelant is, fixed carbon content is more high better, and the detrimental impurity content such as ash content, volatile matter and sulphur are more low better, in order to avoid pollute steel.
High-quality carburelant after the smelting of steel uses impure refinery coke seldom through the high temperature roast, this is most important link in recarburization process.Can the quality of carburelant have determined the quality of molten steel quality, also determined the carburetting effect that obtain.
If the joining day of carburelant is too early, it is attached near furnace bottom, and the carburelant that adheres to the furnace wall is difficult for being fused into again molten steel.In contrast, the joining day is excessively slow, has lost the opportunity of carburetting, causes the slow of melting, heating-up time.Might bring the harm that heats up and cause due to excessively.Therefore, carburelant should be incorporated as in adding the process of metal charge.
The characteristic that the high-quality carburelant possesses:
The granular size of carburelant product is moderate, can be according to the type of furnace, capacity adjustment, and absorption rate is fast;
The chemical composition of carburelant product is pure, and high-carbon, low-sulfur, objectionable constituent are atomic, and specific absorption is high;
The carbon structure of carburelant product is good, and refinement in the electric furnace molten steel, homogenizing distribute;
The excellent performance of carburelant product, stable.
Modern steel product innovation, new technology R﹠D process, needing will huge Metallurgical Factory, the smelting of complexity, rolling and aftertreatment technology research process are concentrated to a small-scale smelting and roll on the pilot experiment development platform, rolls by smelting the test simulation that the pilot experiment innovation platform is carried out smelting, hot rolling, cold rolling and deep processing operation.
Vacuum induction furnace rolls the part of pilot experiment development platform as smelting, with the low capacity molten steel, under the strict experiment condition of controlling, simulate smelting experiment and the carburetting of experiment molten steel under industrial condition, it is an important research topic, still need to carry out a large amount of experimental studies, the Continuous optimization recarburization process accurately controls to improve the excellent results of carburetting.
Three, summary of the invention
The objective of the invention is in modern steel product innovation, new technology R﹠D process, the carburetting problem of vacuum induction furnace smelting experiment molten steel, be the recarburization process that overcomes existing vacuum induction furnace smelting experimental steel and defective and the deficiency of carburetting material forms thereof, a kind of vacuum induction furnace smelting experimental steel carbon-iron alloy that carburetting is used and manufacture method thereof are provided, and market application foreground is wide.
The carbon iron master alloy of using for the carburetting of vacuum induction furnace smelting experimental steel of the present invention is to be processed into by the starting material process of following weight percent: high-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%.
Its manufacture method is as follows:
At first according to 100 kilograms/stove or 500 kilograms/stove) batching, will require to be equipped with high-carbon steel scrap 88%, the graphite block 8% of weighing according to weight percent, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤60Pa.When temperature reaches 1550 ℃～1650 ℃, carry out abundant deoxidation, alloying with SiCa alloy and the subsidiary material that account for weight percent 4%, melt again, mix, time is 5～10 minutes, then the carbon iron master alloy molten steel that will melt, mixes pours into and makes it fully cooling in ingot mold, namely become carbon iron intermediate alloy ingot after the demoulding, the carbon-iron alloy ingot is annealed, sawing becomes and is 10mm * 10mm * 50mm～300mm carbon-iron alloy block, is used for the carburetting of vacuum induction furnace smelting experimental steel.
The chemical composition of product of the present invention and weight percentage:
Chemical composition: Fe89～91%, C8～6.7%, Si2.2～1.0%, Mn0.8～1.3%, Ca (trace, ignore).
Described starting material and technical parameter:
High-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%;
High-carbon steel scrap chemical composition (%): Fe 〉=97, Si≤0.35, Mn≤1.75, P≤0.01, S≤0.007, other impurity for detecting.
Graphite block chemical composition (%): C 〉=97, other is impurity.
Product of the present invention is held three keys in preparation process:
(1) starting material must be preferred, and raw-material content's index must meet the demands;
(2) starting material must mix under high-temperature liquid state, and are even with each chemical composition that guarantees Fe-C master alloy product.
(3) the carbon-iron alloy ingot is annealed
Carbon iron master alloy of the present invention is applied to the carburetting of vacuum induction furnace smelting experimental steel and has following obvious advantage and effect:
Simple to operation, technological operation time shorten, efficient improve, and have solved and have smelted the difficult problem that experimental steel carburetting is accurately controlled, carburetting novel form, efficient, stable;
Smelt the cost of experimental steel;
Because carbon iron master alloy product is bulk form, fusing point, proportion are higher, and the scaling loss of C significantly reduces, and the recovery rate of C increases substantially, and the carburetting material cost reduces;
Due to the cleanliness factor raising of carbon iron master alloy, the inclusion size in experimental steel reduces, quantity reduces, and the quality of experimental steel improves;
Add operational safety reliable, operating environment is effectively improved;
Because fusing point, proportion and experimental steel are close, C being evenly distributed in molten steel;
Because adding technological operation time shorten, efficient to improve, the experimental steel qualification rate improves;
Carburetting is effective, and the add-on of carburelant significantly reduces, and comprehensive cost reduces.
Four, embodiment
The present invention is described in detail below in conjunction with embodiment.
Embodiment 1:
Carbon iron master alloy for the carburetting of vacuum induction furnace smelting experimental steel of the present invention is to be processed into by the starting material process of following weight percent: high-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%.
Starting material chemical composition and the weight percentage of making product of the present invention are:
High-carbon steel scrap chemical composition (%): Fe 〉=97, Si≤0.35, Mn≤1.75, P≤0.01, S≤0.007, other impurity for detecting.
Graphite block chemical composition (%): C 〉=97, other impurity for detecting.
The method of making product of the present invention is as described below: at first prepare burden according to 100 kilograms/stove, to be equipped with according to weight percent high-carbon steel scrap 88%, the graphite block 8% of weighing, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤40Pa.When temperature reaches 1650 ℃, with SiCa alloy and the abundant deoxidation of subsidiary material 4%, alloying, melt subsequently, mix, the time is 2 minutes, then melt-blended even molten steel is poured in ingot mold, treat that it is fully cooling, namely become carbon iron intermediate alloy ingot after the demoulding,, the carbon-iron alloy ingot is annealed, sawing becomes the carbon-iron alloy block for 10mm * 10mm * 30mm, is used for the carburetting of vacuum induction furnace smelting experimental steel.
The chemical composition of product of the present invention and weight percentage are: Fe90%, C7%, Si1.5%, Mn1.5%, Ca (trace, ignore).
Embodiment 2:
Carbon iron master alloy for the carburetting of vacuum induction furnace smelting experimental steel of the present invention is to be processed into by the starting material process of following weight percent: high-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%.Starting material chemical composition and the weight percentage of making product of the present invention are:
High-carbon steel scrap chemical composition (%): Fe 〉=97, Si≤0.35, Mn≤1.75, P≤0.01, S≤0.007, other impurity for detecting.
Graphite block chemical composition (%): C 〉=97, other impurity for detecting.
The method of making product of the present invention is as described below: at first prepare burden according to 100 kilograms/stove, to be equipped with according to weight percent high-carbon steel scrap 88%, the graphite block 8% of weighing, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤30Pa.When temperature reaches 1610 ℃, with SiCa alloy and the abundant deoxidation of subsidiary material 4%, melt subsequently, mix, the time is 2 minutes, then melt-blended even molten steel is poured in ingot mold, treat that it is fully cooling, namely become carbon iron intermediate alloy ingot after the demoulding,, the carbon-iron alloy ingot is annealed, sawing becomes the carbon-iron alloy block for 10mm * 10mm * 25mm, is used for the carburetting of vacuum induction furnace smelting experimental steel.
The chemical composition of product of the present invention and weight percentage are: Fe90%, C7%, Si2%, Mn1.0%, Ca (trace, ignore).
Claims (3)
1. a carburetting carbon-iron alloy, is characterized in that being made by the starting material of following weight percent: high-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%.
2. a carburetting carbon-iron alloy as claimed in claim 1, is characterized in that raw-material chemical composition and weight percentage: high-carbon steel scrap 88%, graphite block 8%, SiCa alloy and subsidiary material 4%; High-carbon steel scrap chemical composition (%): Fe 〉=97, Si≤0.35, Mn≤1.75, P≤0.01, S≤0.007, other impurity for detecting; Graphite block chemical composition (%): C 〉=97, other impurity for detecting.
One kind as claimed in claim 1 the carburetting of feature with the preparation technology of carbon-iron alloy, it is characterized in that according to 100 kilograms or 25 kilograms or 500 kilograms/stove batching, to be equipped with according to weight percent high-carbon steel scrap and the graphite block of weighing, put into 100 kilograms of vacuum medium frequency induction furnace crucibles, carry out vacuum melting, vacuum tightness≤60Pa; With the abundant deoxidation of silicon barium calcium, when temperature reaches 1580 ℃～1650 ℃, molten steel adds SiCa alloy and the subsidiary material that are equipped with weighing according to weight percent in the crucible, melt subsequently, mix, time is 1 minute～10 minutes, then the molten steel that mixes is poured in ingot mold, and the cooling rear demoulding namely becomes carburetting carbon-iron alloy ingot fully, carbon-iron alloy is carried out graphitizing annealing, and sawing becomes approximately 10mm * 10mm * 50mm～300mm carbon-iron alloy block.
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| CN2013100668475A CN103160726A (en) | 2013-03-04 | 2013-03-04 | Carbon-iron alloy for recarburization and manufacture method thereof |
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| CN2013100668475A CN103160726A (en) | 2013-03-04 | 2013-03-04 | Carbon-iron alloy for recarburization and manufacture method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724788A (en) * | 2019-10-08 | 2020-01-24 | 鞍钢股份有限公司 | Preparation and use method of carbon-containing steel block deoxidizer for vacuum furnace steelmaking |
| CN112111616A (en) * | 2019-06-20 | 2020-12-22 | 上海梅山钢铁股份有限公司 | Cold-pressed composite furnace charge for blast furnace ironmaking and preparation method thereof |
| CN113025819A (en) * | 2021-02-24 | 2021-06-25 | 成都先进金属材料产业技术研究院股份有限公司 | Method for recycling spectrum pure graphite crucible |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63134623A (en) * | 1986-11-25 | 1988-06-07 | Daido Steel Co Ltd | Denitrification method utilizing iron oxide |
| CN102373360A (en) * | 2011-11-03 | 2012-03-14 | 内蒙古包钢钢联股份有限公司 | Fe-La intermediate alloy for rare earth addition into steel and manufacture method thereof |
-
2013
- 2013-03-04 CN CN2013100668475A patent/CN103160726A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63134623A (en) * | 1986-11-25 | 1988-06-07 | Daido Steel Co Ltd | Denitrification method utilizing iron oxide |
| CN102373360A (en) * | 2011-11-03 | 2012-03-14 | 内蒙古包钢钢联股份有限公司 | Fe-La intermediate alloy for rare earth addition into steel and manufacture method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112111616A (en) * | 2019-06-20 | 2020-12-22 | 上海梅山钢铁股份有限公司 | Cold-pressed composite furnace charge for blast furnace ironmaking and preparation method thereof |
| CN110724788A (en) * | 2019-10-08 | 2020-01-24 | 鞍钢股份有限公司 | Preparation and use method of carbon-containing steel block deoxidizer for vacuum furnace steelmaking |
| CN110724788B (en) * | 2019-10-08 | 2022-02-18 | 鞍钢股份有限公司 | Preparation and use method of carbon-containing steel block deoxidizer for vacuum furnace steelmaking |
| CN113025819A (en) * | 2021-02-24 | 2021-06-25 | 成都先进金属材料产业技术研究院股份有限公司 | Method for recycling spectrum pure graphite crucible |
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Application publication date: 20130619 |