RU2454286C2 - Method of producing seamless hot-worked boiler and steam pipes - Google Patents
Method of producing seamless hot-worked boiler and steam pipes Download PDFInfo
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- RU2454286C2 RU2454286C2 RU2010141603/02A RU2010141603A RU2454286C2 RU 2454286 C2 RU2454286 C2 RU 2454286C2 RU 2010141603/02 A RU2010141603/02 A RU 2010141603/02A RU 2010141603 A RU2010141603 A RU 2010141603A RU 2454286 C2 RU2454286 C2 RU 2454286C2
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Изобретение относится к области производства бесшовных котельных и паропроводных труб из жаропрочной стали 10Х9К3В2МФБР-Ш и может найти применение при производстве труб для паровых котлов, паропроводов и коллекторов.The invention relates to the production of seamless boiler rooms and steam pipes from heat-resistant steel 10X9K3V2MFBR-Sh and can find application in the production of pipes for steam boilers, steam pipelines and collectors.
Известен способ производства бесшовных горячедеформированных котельных и паропроводных труб из жаропрочной стали, включающий выплавку передельных трубных заготовок способом электрошлакового переплава в виде сплошных слитков размером, механическую обработку-обточку сплошных слитков в слитки-заготовки, сверление в слитках-заготовках центрального отверстия, нагрев слитков-заготовок в методической печи, прошивку слитков-заготовок в стане поперечно-винтовой прокатки в гильзы на оправках, прокатку гильз на пилигримовых станах в трубы с вытяжками в зависимости от диаметра и толщины стенки (RU 2322314, В21В 19/04, опубликовано 20.04.2008).A known method for the production of seamless hot-deformed boiler and steam pipes from heat-resistant steel, including the smelting of pipe billets by electroslag remelting in the form of solid ingots of size, machining, turning of solid ingots into ingot ingots, drilling in ingots-blanks of a central hole, heating ingots-blanks in a methodical furnace, piercing ingot blanks in a cross-helical rolling mill into sleeves on mandrels, rolling sleeves on pilgrim mills into pipes with hoods, depending on the diameter and wall thickness (RU 2322314, B21B 19/04, published on 04/20/2008).
Недостатком известного способа является невозможность его использования для изготовления бесшовных котельных и паропроводных труб из жаропрочной стали 10Х9К3В2МФБР-Ш в связи с повышенными нагрузками на приводы пилигримовых станов при прокатке, что может привести к поломкам предохранительных болтов и шпинделей пилигримового стана.The disadvantage of this method is the impossibility of its use for the manufacture of seamless boiler and steam pipes made of heat-resistant steel 10X9K3V2MFBR-Sh due to increased loads on the pilgrim mill drives during rolling, which can lead to breakage of the safety bolts and spindles of the pilgrim mill.
Задачей и техническим результатом изобретения является способ производства труб из жаропрочной стали 10Х9К3В2МФБР-Ш, обеспечивающий снижение нагрузок на приводы пилигримовых станов при прокатке и достижение следующих технических параметров бесшовных котельных и паропроводных труб при высоких температурах эксплуатации:The objective and technical result of the invention is a method for the production of pipes from heat-resistant steel 10X9K3V2MFBR-Sh, which reduces the load on the pilgrim mill drives during rolling and achieves the following technical parameters of seamless boiler and steam pipes at high operating temperatures:
длительной прочности long durability
длительной пластичности long ductility
Технический результат достигается тем, что способ производства бесшовных горячедеформированных котельных и паропроводных труб из жаропрочной стали 10Х9К3В2МФБР-Ш включает выплавку передельных трубных заготовок способом электрошлакового переплава в виде сплошных слитков, их механическую обработку, сверление центрального отверстия, нагрев в методической печи, прошивку в стане поперечно-винтовой прокатки в гильзы на оправках и прокатку гильз на пилигримовых станах в трубы, причем нагрев слитков до температуры 1160-1180°С ведут со скоростью 3,2-3,3°С/мин, выдерживают при данной температуре в течение 60-80 мин, прошивают в стане поперечно-винтовой прокатки в гильзы на оправках с посадом по диаметру Δ=6,7% и вытяжками µ от 1,43 до 1,57, а прокатку гильз ведут с обжатием по диаметру Δ=41,0% и вытяжками µ от 4,36 до 7,66.The technical result is achieved by the fact that the method for the production of seamless hot-deformed boiler and steam pipes from heat-resistant steel 10X9K3V2MFBR-Sh includes the smelting of pipe billets by electroslag remelting in the form of solid ingots, their machining, drilling a central hole, heating in a methodical furnace, and flashing in the mill transversely - screw rolling into sleeves on mandrels and rolling sleeves on pilgrim mills into pipes, and ingots are heated to a temperature of 1160-1180 ° C at a speed of 3 , 2-3.3 ° C / min, maintained at this temperature for 60-80 minutes, stitched in a cross-helical mill in sleeves on mandrels with a diameter of Δ = 6.7% and hoods µ from 1.43 up to 1.57, and the rolling of sleeves is carried out with compression in diameter Δ = 41.0% and hoods µ from 4.36 to 7.66.
Технический результат также достигается тем, что слитки равномерно кантуют на угол 290-300° при нагревании через 24-26 мин, а при выдержке - через 15-20 мин.The technical result is also achieved by the fact that the ingots evenly turn over an angle of 290-300 ° when heated after 24-26 minutes, and when holding - after 15-20 minutes.
Способ по изобретению может быть проиллюстрирован следующим примером.The method according to the invention can be illustrated by the following example.
Исходным материалом для реализации способа по изобретению служили семь сплошных слитков размером 465×1750±50 мм из стали 10Х9К3В2МФБР-Ш производства ОАО «Мечел», полученные способом электрошлакового переплава. Сплошные трубные заготовки подвергали механической обработке-обточке в слитки размером 450×1750±50 мм. Затем в слитках сверлили центральные отверстия диаметром 100±5,0 мм. После этого слитки садили в два ряда в методическую печь и с восьмого по четвертое окно методической печи равномерно нагревали до температуры 1170±10°С со скоростью 3,25±0,5°С/мин и в течение 72 мин выдерживали при температуре 1170±10°С. При нагреве и выдержке слитки равномерно кантовали на угол 295±5°: при нагреве через 25 мин, а при выдержке - через 17 мин. После нагрева слитки с температурой центра заготовок 1160-1180°С из четвертого окна кантовали на яму печи и выдавали на прошивку.The starting material for the implementation of the method according to the invention was seven solid ingots with a size of 465 × 1750 ± 50 mm made of 10Kh9K3V2MFBR-Sh steel manufactured by Mechel OAO, obtained by electroslag remelting. Continuous tube blanks were machined and turned into ingots 450 × 1750 ± 50 mm in size. Then, the central holes with a diameter of 100 ± 5.0 mm were drilled in ingots. After that, the ingots were planted in two rows in the methodical furnace and from the eighth to fourth window of the methodical furnace they were uniformly heated to a temperature of 1170 ± 10 ° C at a rate of 3.25 ± 0.5 ° C / min and kept at a temperature of 1170 ± 72 minutes 10 ° C. During heating and aging, the ingots evenly turned over at an angle of 295 ± 5 °: during heating after 25 minutes, and during aging - after 17 minutes. After heating the ingot with a temperature of the center of the billets of 1160–1180 ° C, from the fourth window turned over onto the pit of the furnace and issued for firmware.
Прошивку в стане поперечно-винтовой прокатки слитков вели в гильзы размером 420 вн.×225±5×24080±70 мм на оправках диаметром 200 мм с посадом по диаметру Δ=6,7% и вытяжками µ 1,52±0,04. Затем гильзы прокатывали на пилигримовых станах в трубы размером 245×18 мм с обжатием по диаметру Δ=41,0% и вытяжками µ=4,40±0,04.The piercing in the cross-helical rolling mill of ingots was carried out in sleeves of 420 in. × 225 ± 5 × 24080 ± 70 mm in size on mandrels with a diameter of 200 mm with a diameter setting of Δ = 6.7% and hoods µ 1.52 ± 0.04. Then the sleeves were rolled on pilgrim mills into pipes 245 × 18 mm in size with a diameter compression of Δ = 41.0% and hoods µ = 4.40 ± 0.04.
Механические свойства труб (см. таблицу 1) из стали 10Х9К3В2МФБР-Ш, полученные способом по изобретению при комнатной температуре выше аналогичных показателей труб, полученных известным способом из стали 10Х9МФБ-Ш (ТУ14-3Р-55-2001)The mechanical properties of the pipes (see table 1) made of 10Kh9K3V2MFBR-Sh steel obtained by the method according to the invention at room temperature are higher than those of pipes obtained in a known manner from 10Kh9MFB-Sh steel (TU14-3R-55-2001)
Все товарные трубы из жаропрочной стали 10Х9К3 В2МФБР-Ш, полученные способом по изобретению, имели более высокие характеристики при высоких температурах:All commodity pipes of heat-resistant steel 10X9K3 B2MFBR-Sh, obtained by the method according to the invention, had higher characteristics at high temperatures:
длительную прочность long durability
длительную пластичность long ductility
При осуществлении способа по изобретению были снижены нагрузки на приводы пилигримовых станов при прокатке.When carrying out the method according to the invention, the loads on the pilgrim mill drives during rolling were reduced.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2527550C2 (en) * | 2012-12-21 | 2014-09-10 | Открытое акционерное общество "Челябинский трубопрокатный завод" | PRODUCTION OF SEAMLESS HOT-WORKED BOILER AND STEAM LINE 465×15-24 mm PIPES FROM "10Х9К3Б2МФБР-Ш"-GRADE REFRACTORY STEEL FOR POWER EQUIPMENT WITH STEAM SUPERCRITICAL PARAMETERS |
RU2557839C1 (en) * | 2014-01-24 | 2015-07-27 | Общество с ограниченной ответственностью "КОММЕТПРОМ" (ООО "КОММЕТПРОМ" "COMMETPROM") | Method of production of cold-wrought seamless pipes (versions) and heat-resistant seamless pipe made by this method (versions) |
RU2563566C2 (en) * | 2013-12-20 | 2015-09-20 | Общество с ограниченной ответственностью "КОММЕТПРОМ" (ООО "КОММЕТПРОМ" "COMMETPROM") | Method of production of cold-wrought seamless pipes and heat-resistant seamless pipe made by this method |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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RU2527550C2 (en) * | 2012-12-21 | 2014-09-10 | Открытое акционерное общество "Челябинский трубопрокатный завод" | PRODUCTION OF SEAMLESS HOT-WORKED BOILER AND STEAM LINE 465×15-24 mm PIPES FROM "10Х9К3Б2МФБР-Ш"-GRADE REFRACTORY STEEL FOR POWER EQUIPMENT WITH STEAM SUPERCRITICAL PARAMETERS |
RU2563566C2 (en) * | 2013-12-20 | 2015-09-20 | Общество с ограниченной ответственностью "КОММЕТПРОМ" (ООО "КОММЕТПРОМ" "COMMETPROM") | Method of production of cold-wrought seamless pipes and heat-resistant seamless pipe made by this method |
RU2557839C1 (en) * | 2014-01-24 | 2015-07-27 | Общество с ограниченной ответственностью "КОММЕТПРОМ" (ООО "КОММЕТПРОМ" "COMMETPROM") | Method of production of cold-wrought seamless pipes (versions) and heat-resistant seamless pipe made by this method (versions) |
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