SU618451A1 - Method of nitrocementation of steel articles - Google Patents
Method of nitrocementation of steel articlesInfo
- Publication number
- SU618451A1 SU618451A1 SU762356602A SU2356602A SU618451A1 SU 618451 A1 SU618451 A1 SU 618451A1 SU 762356602 A SU762356602 A SU 762356602A SU 2356602 A SU2356602 A SU 2356602A SU 618451 A1 SU618451 A1 SU 618451A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- nitrocementation
- carbon
- total
- steel articles
- nitrogen
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
(54) СПОСОБ НИТРОЦЕМЕНТАЦИИ СТАЛЬНЫХ ИЗДЕЛИЙ(54) METHOD OF NITROCEMENTING STEEL PRODUCTS
Изобретение относитс к химико-термической обработке материалов.This invention relates to the chemical heat treatment of materials.
Известен способ ншроцемеитацин стальных изделий в углеродо.азотистой смеси с содержанием аммиака 2-10% 1.The known method of nshrocemeiticin steel products in carbon-nitrogen mixture with an ammonia content of 2-10% 1.
Недостатком известного способа при цементации стальных изделий на глубину более 1,2 мм вл етс пересыщеиие поверхностного сло углеродом и азотом, что сопровождаетс образованием избыточного количества карбсшитридной фазы и темной составл ющей.The disadvantage of the known method in cementation of steel products to a depth of more than 1.2 mm is the supersaturation of the surface layer with carbon and nitrogen, which is accompanied by the formation of an excessive amount of the carbschitride phase and the dark component.
Известен также способ нитроцементации в феде углеродоазотистой смеси при темпфатуре 840-870° С, щж котором нагрев и вьщержку в течение 1/4-1/5 времени общей вьщержки провод т в углеродсодержащей среде 12.There is also known a method of carbonitriding in a carbon-nitrogen mixture at a temperature of 840–870 ° C, for which heating and heat during 1 / 4–1 / 5 of the total heat is carried out in a carbon-containing medium 12.
Недостатком известного способа вл етс длительность процесса и игака прочность обрабатываемых изделий.The disadvantage of this method is the duration of the process and the durability of the processed products.
Известный способ по технической сущности и достигаемому эффекту наиболее близок к 1ф едложенн ому.The known method according to the technical nature and the achieved effect is closest to 1f simple.
Целью изобретени вл етс сокращение длительности процесса и повышение прочности The aim of the invention is to reduce the duration of the process and increase the strength
изделий при насыщении иа глубину с;1о более 1,2 мм.products at saturation and depth from; 1о more than 1.2 mm.
Эта цель достигаетс тем, что по истечении 1/4-1/5 времени общей выдержки -увеличивают подачу углеродсод жащих газов на 15-20% от начального и подают азотсодержащий газ в количестве 2-10% от общего расхода газа, а по истечении 1/2-2/3 и каждые последующие 1/6-1/8 времени общей вьщержки увеличивают подачу азотсодержащего газа на 3-10%.This goal is achieved by the fact that after 1 / 4-1 / 5 of the total exposure time, the supply of carbon-containing gases is increased by 15–20% of the initial gas and nitrogen-containing gas is supplied in the amount of 2–10% of the total gas flow rate, and after 1 / 2-2 / 3 and every subsequent 1 / 6-1 / 8 times the total supply increases the supply of nitrogen-containing gas by 3-10%.
П р и М е р. В печь, нагретую до рабочей температуры ( С), загружают сухие детали из стали 18XIT. Во врем нагрева деталей подают только углеродсодержащий газ дл создани нейтральной атмосферы. Выдерживают детали в зтой атмосфере в течение 1/4-1/5 времени общей выдержки. Затем увеличивают подачу углеродсодфжащих газов на 15-20% от начального и подают аммиак в количестве 2-10% от общего расхода газов в течение 1/2-2/3 времени общей выдержки. По истечении 1/2-2/3 и каждые последующие 1/6-1/8 времени общей вьщержки увеличивают подачу азотсодфжащего газа на 310% .PRI and MER. Dry parts made of 18XIT steel are loaded into the furnace heated to operating temperature (C). During heating of the parts, only carbon-containing gas is supplied to create a neutral atmosphere. Maintain parts in this atmosphere for 1 / 4-1 / 5 total exposure time. Then increase the supply of carbon dioxide gas by 15-20% of the initial and ammonia is fed in the amount of 2-10% of the total gas flow rate for 1 / 2-2 / 3 total exposure time. After 1 / 2-2 / 3 and every subsequent 1 / 6-1 / 8 times, the total delivery increases the supply of nitrogen-containing gas by 310%.
Полученные результаты представлены в таблнце.The results are presented in table.
Предложенный способ сокращает длительность 1фоцесса ннтроцемштацнн, улучшает расРежим обработкнThe proposed method shortens the duration of the 1-file process, improves the processing mode.
ИзвестныйFamous
способ17method17
Т едложенныйT lay
способ13method13
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU762356602A SU618451A1 (en) | 1976-04-28 | 1976-04-28 | Method of nitrocementation of steel articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU762356602A SU618451A1 (en) | 1976-04-28 | 1976-04-28 | Method of nitrocementation of steel articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU618451A1 true SU618451A1 (en) | 1978-06-23 |
Family
ID=20660066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU762356602A SU618451A1 (en) | 1976-04-28 | 1976-04-28 | Method of nitrocementation of steel articles |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU618451A1 (en) |
-
1976
- 1976-04-28 SU SU762356602A patent/SU618451A1/en active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2257668A (en) | Formation of protective layers on iron and steel articles | |
| KR870010211A (en) | Improved Surface Wear Quality Metal Treatment | |
| US2811466A (en) | Process of chromizing | |
| ATE16118T1 (en) | PROCESS FOR HEAT TREATMENT OF METAL WORKPIECES BY CARBURIZING. | |
| US4152177A (en) | Method of gas carburizing | |
| SU618451A1 (en) | Method of nitrocementation of steel articles | |
| US1772866A (en) | Treatment of iron and steel | |
| US3639641A (en) | Method for rapid manufacture of nitrided thick layer of super high hardness on ferrous metal articles | |
| CN101238236A (en) | Ion nitriding method | |
| GB2153855A (en) | Stainless steel case hardening process | |
| JP3046293B2 (en) | Vacuum carburizing method | |
| JPH08209324A (en) | Method of pretreating member made of steel in the form of passive state before carbonitridation in salt bath | |
| SU914651A1 (en) | Method for chemical and heat treatment of stainless steel products | |
| SU850735A1 (en) | Method of strengthening metal-carbon steel | |
| SU1206334A1 (en) | Method of carbonitriding articles made from high-alloyed steels | |
| US1975058A (en) | Process for hardening metals | |
| US1909669A (en) | Nitriding | |
| Florian et al. | On the Equilibrium of the Complex Atmosphere Used in Carburizing and Carbonitriding Treatments of Steels | |
| SU1019008A1 (en) | Method for surface hardening of steels, preferably of the austentic class | |
| SU945244A1 (en) | Method for nitriding | |
| Uzunova | Nitriding and Carburization of R 6 M 5 Steel Under Vacuum | |
| SU973668A1 (en) | Composition for siliconizing steel parts | |
| SU513116A1 (en) | Method of gas grouting | |
| JPS5514851A (en) | Method and apparatus for gas nitriding of stainles steel | |
| SU1763517A1 (en) | Method for surface hardening of steel members |