SU55215A1 - Method for surface decarburization of gray iron - Google Patents

Method for surface decarburization of gray iron

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Publication number
SU55215A1
SU55215A1 SU18807A SU18807A SU55215A1 SU 55215 A1 SU55215 A1 SU 55215A1 SU 18807 A SU18807 A SU 18807A SU 18807 A SU18807 A SU 18807A SU 55215 A1 SU55215 A1 SU 55215A1
Authority
SU
USSR - Soviet Union
Prior art keywords
gray iron
surface decarburization
decarburization
graphite
iron
Prior art date
Application number
SU18807A
Other languages
Russian (ru)
Other versions
SU16720A1 (en
Inventor
П.А. Рождественский
Original Assignee
П.А. Рождественский
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Publication of SU16720A1 publication Critical patent/SU16720A1/en
Application filed by П.А. Рождественский filed Critical П.А. Рождественский
Priority to SU18807A priority Critical patent/SU55215A1/en
Application granted granted Critical
Publication of SU55215A1 publication Critical patent/SU55215A1/en

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Description

Изде.ди  из серого чугуна подвергают обезуглероживанию, помеща  их в среду сухого и особенно влажного водорода. Подобным же способом производ т обезуглероживание в среде диссоциированного аммиака с некоторым содержанием влаги.Gray cast iron products are decarburized by placing them in a medium of dry and especially wet hydrogen. In a similar way, decarburization is carried out in an environment of dissociated ammonia with a certain moisture content.

Предлагаемый способ обезуглероживани  относитс  к последнему способу и отличаетс  тем, что часть водорода, содержащегос  в диссоциированном аммиаке, сжигают при поступлении в печь. Предлагаемый способ используетс  дл  подготовки чугунных изделий к лужению.The proposed decarburization method is related to the latter method and is characterized in that part of the hydrogen contained in dissociated ammonia is burned upon entry into the furnace. The proposed method is used to prepare cast iron products for tinning.

Поверхностное удаление графита из серого чугуна производитс  путем термообработки его при 800° в проточном диссоциированном аммиаке , с увлажнением продуктов диссоциации путем сжигани  в горелке Даниэл  кислородом воздуха части водорода.Surface removal of graphite from gray iron is carried out by heat treatment of it at 800 ° in flowing dissociated ammonia, moistening the dissociation products by burning part of hydrogen in the Daniel burner with oxygen.

Достаточна  глубина удалени  графита, мешающего, как известно, лужению серого чугуна, получаетс , по данным за вител , за 20 мин. Металлографически удаление графита чугуна не обнаруншваетс , так как на шлифе нельз  отличить графит от пустот, остающихс  послеA sufficient depth of removal of graphite, which interferes, as is well known, with the tinning of gray iron, is obtained, according to the data, for 20 minutes. Metallographic removal of graphite of cast iron is not detected, since it cannot be distinguished on thin sections from graphite from voids remaining after

удалени  графита. Поэтому показателем эффективности процесса  вл етс  наблюдение качества полуды обезуглероженного чугуна. По указани м за вител , с поверхности серого чугуна без обработки в печи полуда до застывани  легко стираетс  щеткой, а с обработанного не стираетс ; к не обработанному в печи луженому чугуну не пристает баббит, а к обработанному лужоному - пристает . Процесс удалени  графита происходит по реакции:graphite removal. Therefore, an indicator of the effectiveness of the process is the observation of the quality of half a day of decarburized iron. According to the instructions of the visitor, from the surface of gray cast iron without treatment in a half a kiln before hardening, it is easily erased with a brush, and it is not erased from the treated; The babbit does not stick to the tin-treated cast iron not treated in the furnace, and sticks to the treated pool. The process of graphite removal occurs by reaction:

С -т СН4,C-CH4

что .можно обнаружить анализом газов . Температурный оптимум этой реакции - ниже и выще этой температуры реакци  замедл етс ; при 1000° она не идет совсем.what can be detected by gas analysis. The temperature optimum of this reaction is lower and higher than this temperature the reaction is slowed down; at 1000 ° it does not go at all.

Дл  проведени  предлагаемого способа можно использовать азотоционные двухкамерные печи с подвижным электронагревательным кожухом и хромитовыми затворами дл  камер. Способ пригоден дл  массового обезуглероживани  таких деталей , как подщипники легкогрузных товарных вагонов и маломощных диделей , м сорубки, сепараторы.For carrying out the proposed method, it is possible to use nitrogen-containing two-chamber furnaces with a movable electric heating jacket and chromite closures for the chambers. The method is suitable for mass decarburization of such parts as sub-carriers of light-duty freight wagons and low-power didels, cutting machines, and separators.

предмет изобретени .subject matter of the invention.

Способ поверхностного обезуглероживани  серого чугуна в увлажненном диссоциированном аммиаке,The method of surface decarburization of gray iron in humidified dissociated ammonia,

отличающийс  тем, что часть водорода , содержащегос  в диссоциированном аммиаке, сжигают при поступлении в печь.characterized in that a portion of the hydrogen contained in the dissociated ammonia is burned upon entry into the furnace.

SU18807A 1938-09-09 1938-09-09 Method for surface decarburization of gray iron SU55215A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU18807A SU55215A1 (en) 1938-09-09 1938-09-09 Method for surface decarburization of gray iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU18807A SU55215A1 (en) 1938-09-09 1938-09-09 Method for surface decarburization of gray iron

Publications (2)

Publication Number Publication Date
SU16720A1 SU16720A1 (en) 1930-09-30
SU55215A1 true SU55215A1 (en) 1938-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU18807A SU55215A1 (en) 1938-09-09 1938-09-09 Method for surface decarburization of gray iron

Country Status (1)

Country Link
SU (1) SU55215A1 (en)

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