CN103146978B - Method for producing high-chromium low-phosphorus electroslag steel for rollers - Google Patents

Method for producing high-chromium low-phosphorus electroslag steel for rollers Download PDF

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CN103146978B
CN103146978B CN201310072752.4A CN201310072752A CN103146978B CN 103146978 B CN103146978 B CN 103146978B CN 201310072752 A CN201310072752 A CN 201310072752A CN 103146978 B CN103146978 B CN 103146978B
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phosphorus
controlled
slag
steel
content
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CN103146978A (en
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王利伟
薛正学
都郢祁
张治广
田新中
郭兴坤
郭保善
潘光忠
苏庆林
闫丽珍
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Xingtai Iron and Steel Co Ltd
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Xingtai Iron and Steel Co Ltd
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Abstract

The invention relates to a method for producing high-chromium low-phosphorus electroslag steel for rollers, belonging to the technical field of electrometallurgy in metallurgy industry. The technical scheme is as follows: the method comprises the steps of top/bottom combined blown converter smelting, LF (ladle furnace) refinement, RH vacuum degassing, square billet continuous casting, and double-electrode series electroslag remelting with withdrawing of ingot. The method can product the high-chromium low-phosphorus electroslag steel for rollers with lower cost and higher yield. Compared with the traditional electric-furnace-cooperated fixed type electroslag remelting technique for producing steels for rollers, the method provided by the invention lowers the production cost by about 300 Yuan per ton of steel, and enhances the comprehensive yield by 10%. In the electroslag steel ingot finished product which is 600 millimeter in diameter and 6 meters long, the chromium content is controlled above 3.00%, the phosphorus content is controlled below 0.012%, and stable and optimized control of other chemical elements is also realized; and the high-chromium low-phosphorus electroslag steel for rollers has good surface quality and internal structure. The method well satisfies the demands of downstream users, and implements high economic benefit.

Description

A kind of method of producing the low-phosphorous roll of high chromium Electro Slag Remelting Steel
Technical field
The present invention relates to a kind of method of producing the low-phosphorous roll of high chromium Electro Slag Remelting Steel, belong to metallurgy industry electrometallurgy technical field.
Background technology
At present, background technology produce chromium content more than 3.00%, the roll of phosphorus content below 0.012% be while using Electro Slag Remelting Steel, the general electric furnace that adopts is heated and has been realized high-chromium alloy content by high power electrodes, carries out repeatedly slag making and has realized low-phosphorous control, has ensured with this continuity that electrode strand is produced; Often adopt fixed electroslag furnace to produce Electro Slag Remelting Steel for electrode strand, ESR ingot height is generally 2 meters of left and right, because its Electro Slag Remelting Steel aspect ratio is limit, therefore in the time producing roll, considers corresponding the having a greatly reduced quality of its lumber recovery of factor such as excision amount end to end.
Summary of the invention
The object of the invention is to provide a kind of method of producing the low-phosphorous roll of high chromium Electro Slag Remelting Steel, utilize the steel-making equipments such as existing converter to produce the low-phosphorous electrode strand of high chromium that has more cost advantage, adopt bipolar series stripping formula electroslag furnace to produce larger ratio of height to diameter, the low-phosphorous Electro Slag Remelting Steel of high chromium that lumber recovery is higher, have the feature that energy consumption per ton steel is lower concurrently simultaneously, in meeting downstream user demand, produce good economic benefit, solved the problems referred to above that exist in background technology.
Technical scheme of the present invention is: a kind of method of producing the low-phosphorous roll of high chromium Electro Slag Remelting Steel, comprise top and bottom combined blown converter smelting, LF refining, RH vacuum outgas, billet continuous casting, bipolar series stripping formula esr operation, and the parameter control of each operation is as follows:
1. top and bottom combined blown converter smelting operation, for preventing that phosphorus is high, converter terminal control adopts the high operation of re-blowing of drawing, put steel in sample, a catch carbon End Aim Temperature is 1600-1630 DEG C, afterwards using stokehold phosphorus weight ratio content 0.008% as the boundary of whether re-blowing, low temperature catch carbon has been realized low phosphorus content control, thereby avoid slag under tapping process to guarantee that phosphorus weight ratio content leaving from station is controlled in 0.010% by infrared lower slag detection system, consider the low temperature corresponding converter operation high carbon ferro-chrome add-on that reduced leaving from station, control weight of chromium leaving from station than content at 1.80-1.90%;
2. LF refining procedure, LF operation adds high carbon ferro-chrome in batches, progressively carries out composition adjustment according to temperature conditions, and binary finishing slag basicity is controlled at 6.5-7.5;
3. RH vacuum outgas operation, minimum vacuum degree control is in 100P, and vacuum processing time is greater than 20 minutes, and the pure degassed time is not less than 5 minutes, ensures that hydrogen richness is controlled in 2ppm;
4. billet continuous casting operation, wraps temperature in first stove and is controlled at 1483-1498 DEG C, connects to water in stove, to wrap temperature and be controlled at 1478-1493 DEG C, and stable pulling rate is 0.6 m/min;
5. bipolar series stripping formula esr operation, adopt quaternary slag system slag charge, composition weight ratio is fluorite: aluminum oxide powder: lime: silica=56.5:28:11.5:4, melt slag charge in change cinder ladle after, pouring crystallizer into smelts, smelting process reductor adopts aluminium powder, adding requirement is 10-15 gram/3 minutes, the molten speed control of target is at 600 ± 20 kgs/hr, fusion process secondary current and secondary voltage are controlled at respectively 8-12 kilo-ampere and 85-95 volt, the exchange electrode time was controlled within 90 seconds, bipolar series stripping formula electroslag furnace electric power consumption per ton steel is far below fixed electroslag furnace, realized the continuous production of ESR ingot by exchange electrode, ESR ingot lumber recovery is higher than the fixed electroslag furnace 10% of tradition.
Processing step is as follows more specifically:
1. top and bottom combined blown converter smelting operation, utilize the injection system of 80 tons of top and bottom combined blown converters, Weighing system, control system and subsystem are carried out dephosphorization operation, three bottom-blown air bricks of dephosphorizing process are all opened, the composition of having realized smelting process molten steel is even, by control oxygen-supplying amount and time chien shih catch carbon target temperature at 1600-1630 DEG C, finishing slag dual alkalinity R is at 4.0-4.5, adopt low temperature catch carbon can make a catch carbon phosphorus weight ratio content be controlled at below 0.010%, if stokehold detect phosphorus weight ratio content 0.008% and more than, the stove that directly falls is put steel, if phosphorus weight ratio content is below 0.008%, re-blow for energy-conservation consideration, further improve about 20-30 DEG C tapping temperature, tapping process adopts infrared lower slag detection system can not guarantee any more slag, tapping process adds high carbon ferro-chrome to make weight of chromium leaving from station be controlled at 1.80-1.90% than content, entirety phosphorus weight ratio content leaving from station is controlled in 0.010%,
2. LF refining procedure, molten steel enters LF operation, first preheating 10 minutes of electrode, limit heating edge divides seven batches to add successively high carbon ferro-chrome afterwards, binary finishing slag basicity R is controlled at 6.5-7.5, phosphorus weight ratio content leaving from station below 0.011%, weight of chromium leaving from station than content at 3.05-3.15%;
3. RH vacuum outgas operation, the vacuum circular flow treatment time is greater than 20 minutes, and wherein the pure degassed time is not less than 5 minutes, and minimum vacuum degree control is in 100pa;
4. billet continuous casting operation, casting process adopts full guard casting, wraps temperature and be controlled at 1483-1498 DEG C in first stove, connect to water and in stove, wrap temperature and be controlled at 1478-1493 DEG C, target pulling rate is 0.6 m/min, and middle bag sampling hydrogen richness is controlled in 2ppm, waters time stove number and has realized 6 stoves and connect and water;
5. bipolar series stripping formula esr operation, adopt 280 × 325 millimeters of continuous casting square billets of above step production as consumable electrode, select two square billets to carry out the remelting of tandem electroslag, the slag system weight ratio that fusion process uses consists of fluorite: aluminum oxide powder: lime: silica=56.5:28:11.5:4, slag charge was through 800 DEG C of high bakes 10 hours, in crystallizer, directly carry out melt cinder startup changing to pour into after carrying out fritting in cinder ladle, reflow process reductor adopts aluminium powder, adding requirement is evenly to add for 10-15 gram/3 minutes, target melting speed control is at 600 ± 20 kgs/hr, stripping speed and molten speed are connected, fusion process secondary current and secondary voltage are controlled at respectively 8-12 kilo-ampere and 85-95 volt, after two tandem consumable electrode meltings, in 1.5 minutes, realizing electrode changes automatically, thereby realize the continuous production of slender type stripping formula electroslag furnace.
6 meters of long ESR ingot of 600 millimeters of circles that in the present invention, bipolar series stripping formula electroslag furnace is produced only need locating end to end to excise 0.15 meter of long l fraction respectively, lumber recovery is 95%, and 2 meters of long ESR ingot of 3 600 millimeters of circles that traditional fixed electroslag furnace is produced all need locating end to end to excise 0.15 meter of long l fraction respectively, lumber recovery is only 85%, and the Electro Slag Remelting Steel lumber recovery that the present invention produces has by contrast improved 10%.
Effect of the present invention: adopt the present invention produce chromium content more than 3.00%, phosphorus content is 600 millimeters of electroslag billets of diameter of 6 meters in 0.012% following length, ESR ingot surface quality and inner macrostructure are good, each element has been realized stable components control.Do not increasing on the basis of investment, utilizing the steelmaking equipment such as existing converter, bipolar series stripping formula electroslag furnace to explore the novel process of producing the low-phosphorous Electro Slag Remelting Steel of high chromium, good, the richer economic benefit of this technological feasibility.
Brief description of the drawings
Fig. 1 is embodiment of the present invention process flow sheet.
Embodiment
The present invention will be further described by the following examples.
In embodiment, choose 6 meters long polishing roll ESR ingot of a certain 600 millimeters of circles, the invention will be further described.
(1) 8.1 tons of 77.1 tons of the molten iron that converter steel iron charge employing phosphorus weight ratio content is 0.093% and general carbon steel scraps, balk cargo add-on lime, magnesium ball, light dolomite, ferric oxide ball, Wingdale are respectively 4734,206,665,904,1489 kilograms, one time catch carbon temperature is 1592 DEG C, stokehold molten steel phosphorus weight ratio content is 0.005%, after once re-blowing, catch carbon temperature is 1637 DEG C, tapping process adds 2704 kilograms of high carbon ferro-chromes, and tap is 81.55 tons;
(2) LF stove enter the station weight of chromium than content be 1.97%, phosphorus weight ratio content is 0.008%, preheating divides seven batches after 10 minutes and adds 1527 kilograms, ferrochrome, the heating while feeding in raw material, and finishing slag dual alkalinity is 6.79, weight of chromium leaving from station is 3.07% than content, and phosphorus weight ratio content is 0.009%;
(3) RH operation circulation time is 27 minutes, and the pure degassed time is 6 minutes;
(4) casting process is 4 stream protective castings, and setting pulling rate is 0.60 m/min, and middle bag temperature-measuring range is 1488-1491 DEG C, in be bundled into product hydrogen richness be no more than 2ppm, weight of chromium than content be 3.05%, phosphorus weight ratio content is 0.010%;
(5) choose grow up 3 of square billets of 6 meters of 280 × 325 specifications that above operation produces, after being cut into 63 meters of square billets of growing up, be welded into 3 groups of consumable electrodes, selecting slag system is fluorite: aluminum oxide powder: lime: silica=56.5:28:11.5:4, the slag charge toasting is realized melt cinder in crystallizer and is started changing to pour into after carrying out fritting in cinder ladle, reflow process reductor adopts aluminium powder, realize evenly adding of reductor by automatic weighing feeding device, adding requirement is 10-15 gram/3 minutes, the molten speed of target is set as 600 ± 20 kgs/hr, fusion process secondary current and secondary voltage are controlled at respectively 8.8-10.7 kilo-ampere and 88-94 volt, the time of twice exchange electrode is respectively 73 seconds and 81 seconds,
(6) ESR ingot length is 6 meters, diameter is 600 millimeters, in burial pit, carries out slow cooling processing after smelting, after assembly, concentrates and carries out anneal, after annealing furnace is evenly warming up to 800-820 DEG C, be incubated approximately 10 hours, cool to 200 DEG C with the furnace and come out of the stove after following cooling;
(7) ESR ingot surface quality is good, through checking entire body without obvious detection defects, and dense internal organization, finished product ESR ingot chromium, phosphorus weight ratio content are respectively 3.04% and 0.010%.

Claims (1)

1. a method of producing the low-phosphorous roll of high chromium Electro Slag Remelting Steel, is characterized in that comprising top and bottom combined blown converter smelting, LF refining, RH vacuum outgas, billet continuous casting, bipolar series stripping formula esr operation, and the parameter control of each operation is as follows:
1. top and bottom combined blown converter smelting operation, converter terminal control adopts the high operation of re-blowing of drawing, put steel in sample, a catch carbon End Aim Temperature is 1600-1630 DEG C, afterwards using stokehold phosphorus weight ratio content 0.008% as the boundary of whether re-blowing, low temperature catch carbon has been realized low phosphorus content control, thereby avoid slag under tapping process to guarantee that phosphorus weight ratio content leaving from station is controlled in 0.010% by infrared lower slag detection system, consider the low temperature corresponding converter operation high carbon ferro-chrome add-on that reduced leaving from station, control weight of chromium leaving from station than content at 1.80-1.90%;
2. LF refining procedure, LF operation adds high carbon ferro-chrome in batches, and binary finishing slag basicity is controlled at 6.5-7.5;
3. RH vacuum outgas operation, minimum vacuum degree control is in 100Pa, and vacuum processing time is greater than 20 minutes, and the pure degassed time is not less than 5 minutes, ensures that hydrogen richness is controlled in 2ppm;
4. billet continuous casting operation, wraps temperature in first stove and is controlled at 1483-1498 DEG C, connects to water in stove, to wrap temperature and be controlled at 1478-1493 DEG C, and stable pulling rate is 0.6 m/min;
5. bipolar series stripping formula esr operation, adopt quaternary slag system slag charge, composition weight ratio is fluorite: aluminum oxide powder: lime: silica=56.5:28:11.5:4, melt slag charge in change cinder ladle after, pouring crystallizer into smelts, smelting process reductor adopts aluminium powder, adding requirement is 10-15 gram/3 minutes, the molten speed control of target is at 600 ± 20 kgs/hr, fusion process secondary current and secondary voltage are controlled at respectively 8-12 kilo-ampere and 85-95 volt, and the exchange electrode time was controlled within 90 seconds; Described top and bottom combined blown converter smelting operation, utilize injection system, Weighing system, control system and the subsystem of 80 tons of top and bottom combined blown converters to carry out dephosphorization operation, three bottom-blown air bricks of dephosphorizing process are all opened, the composition of having realized smelting process molten steel is even, finishing slag dual alkalinity R is at 4.0-4.5, stokehold detect phosphorus weight ratio content 0.008% and more than, the stove that directly falls is put steel, phosphorus weight ratio content is less than 0.008%, re-blow, further improve 20-30 DEG C of tapping temperature, tapping process adopts infrared lower slag detection system can not guarantee any more slag;
Described LF refining procedure, molten steel enters LF operation, first preheating 10 minutes of electrode, limit heating edge divides seven batches to add successively high carbon ferro-chrome afterwards, phosphorus weight ratio content leaving from station below 0.011%, weight of chromium leaving from station than content at 3.05-3.15%;
Described billet continuous casting operation, casting process adopts full guard casting, and middle bag sampling hydrogen richness is controlled in 2ppm;
Described bipolar series stripping formula esr operation, adopt 280 × 325 millimeters of continuous casting square billets of above step production as consumable electrode, select two square billets to carry out the remelting of tandem electroslag, slag charge was through 800 DEG C of high bakes 10 hours, carry out fritting in change cinder ladle after, pour in crystallizer and directly carry out melt cinder startup, reflow process reductor adopts aluminium powder.
CN201310072752.4A 2013-03-07 2013-03-07 Method for producing high-chromium low-phosphorus electroslag steel for rollers Active CN103146978B (en)

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CN105483309A (en) * 2014-09-19 2016-04-13 鞍钢股份有限公司 Alloy addition method for smelting chromium-containing alloy steel through converter
CN106591681B (en) * 2016-11-30 2018-05-08 邢台钢铁有限责任公司 The method for refining of high-purity hot-work die Electro Slag Remelting Steel
CN110421003A (en) * 2019-07-19 2019-11-08 浙江青山钢铁有限公司 A kind of stainless steel ESR ingot heating once and rolling is become a useful person method
CN112157233A (en) * 2020-09-30 2021-01-01 山西太钢不锈钢股份有限公司 Manufacturing method for two continuous casting of wide steel strip iron-chromium-aluminum alloy continuous casting plate blank

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CN1247328C (en) * 2004-08-24 2006-03-29 宝钢集团上海五钢有限公司 Rolling cogging production method of Cr4Mo4V electroslag steel ingot
CN102443706B (en) * 2011-12-09 2013-03-20 攀钢集团成都钢钒有限公司 Control method for surface cracks of P91 electroslag steel
CN102796882B (en) * 2012-07-20 2013-10-16 浙江电渣核材有限公司 Method for controlling residual aluminum in electroslag steel

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