CN106566295A - Low-cost decarbonization-preventing coating material for heavy rail steel and application of coating material - Google Patents
Low-cost decarbonization-preventing coating material for heavy rail steel and application of coating material Download PDFInfo
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- CN106566295A CN106566295A CN201610985391.6A CN201610985391A CN106566295A CN 106566295 A CN106566295 A CN 106566295A CN 201610985391 A CN201610985391 A CN 201610985391A CN 106566295 A CN106566295 A CN 106566295A
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- coating material
- decarbonization
- heavy rail
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention discloses a low-cost decarbonization-preventing coating material for heavy rail steel and an application of the coating material. The low-cost decarbonization-preventing coating material is prepared from the following raw materials based on weight percentage: 43-52% of river sand, 8-15% of Al<2>O<3> powder, 10-15% of B<2>O<3> powder, 2-5% of light-burned dolomite, 12-17% of iron oxide red powder, 1-2% of Na<2>O powder, and 8-11% of LF refining slag. By adoption of the decarbonization-preventing coating material, occurrence of a surface decarbonization phenomenon of a heavy rail steel casting blank in a heating process can be effectively avoided for a long time, and the decarbonization layer depth on the surface of the casting blank can be lowered; after the decarbonization-preventing coating material is adopted, the surface decarbonization layer depth of the casting blank is less than or equal to 0.4mm when the heavy rail steel casting blank is heated in a heating furnace with furnace gas oxygen content of greater than or equal to 3% for 10-12h, so that related requirement of TB/T 2344-12 is satisfied; meanwhile, compared with a conventional decarbonization-preventing coating material, the manufacturing cost of the low-cost decarbonization-preventing coating material disclosed by the invention is effectively lowered; and therefore, the low-cost production of a heavy rail steel product is realized, and the production cost of each ton of steel is lowered by about 20RM averagely.
Description
Technical field
The present invention relates to the inexpensive anticreep carbon coating material of a kind of metal coating layer material, especially a kind of Properties of Heavy Rail Steel.
Background technology
C is the essential element in Properties of Heavy Rail Steel in addition to Fe, and main intensified element, and it can strengthen the strong of heavy rail
Degree, hardness and wearability.With the increase of carbon content, the strength degree of Properties of Heavy Rail Steel, hardness and wearability increase sharply.According to system
Meter, when carbon content increases to 0.65% from 0.35%, can make the wearability of steel improve 60%.
The carbon content of Properties of Heavy Rail Steel is generally 0.71%～0.80%.As carbon content is higher, cause strand in heating furnace
Overheated, burning sensitivity is larger, serious decarburization phenomenon easily occurs.So-called decarburization phenomenon, refers to strand in heating process,
Surface metal causes phosphorus content to reduce the phenomenon of not even carbon elements content because of oxidation；Its decarburization mechanism is in heating furnace
H2O、CO2、O2、H2Etc. various atmosphere and the Fe in steel3C there occurs stronger oxidation reaction, so that Fe3C atoms in C are by oxygen
Melt.
Decarburization phenomenon is greatly reduced can the mechanical properties such as intensity, hardness, wearability and the fatigue strength of Properties of Heavy Rail Steel, seriously
Affect the quality of heavy rail product.Therefore, how to mitigate or even avoid the decarburization phenomenon of Properties of Heavy Rail Steel casting billet surface, reduce decarburization thickness
Degree, is problem that Heavy-rail Production enterprise pursues solution always.
At present, Heavy-rail Production enterprise solves the problems, such as skin decarburization in Properties of Heavy Rail Steel 2 Mo Steel Slab during Heating Process, it is to avoid casting billet surface takes off
The thicker method of carbon-coating mainly has three kinds：
First method is optimization heating technique, strict heat time heating time of the control strand in heating furnace, and controls heating furnace bag
Interior gas componant, it is to avoid stove is contained within more H2O、O2Deng gas.This method is although reduction heavy rail steel surface can be played
The effect of practical decarburized depth, but in specific implementation procedure, as field equipment state and technique implementation effect can be subject to
Affect, often it is difficult to real reaching reduces the degree of oxidation of heavy rail steel surface, effectively reduces casting billet surface practical decarburized depth
Purpose.
Second method is that substantial amounts of Linesless charcoal is added in stove, is reacted with the oxidizing gas in heating furnace by Linesless charcoal,
Substantial amounts of CO gases are produced, so as to the oxidizing atmosphere in stove is adjusted to reducing atmosphere, it is to avoid casting billet surface is oxidized, drop
Low practical decarburized depth.Although this method can play the effect for mitigating that casting billet surface is oxidized, this method in theory
On the one hand there is larger difficulty in practical operation；On the other hand excessive CO gases are accumulated in stove easily, works as heating furnace
During oven door opening, easily cause CO and leak, so as to damage to field personnel.
The third method is to cover one layer of anticreep carbon coating in casting billet surface.This coating can melt at high temperature, shape
Into one layer of sticky melt film, so as to the oxidizing atmosphere in heating furnace is isolated with strand matrix, it is to avoid matrix is oxidized.
This kind of method is not only able to effectively reduce the practical decarburized depth of Properties of Heavy Rail Steel casting billet surface, and the material for being generated will not be to the person
Damage, be truly realized green, environmental protection production.All various anticreep carbon coatings also exist certain in terms of composition composition at present
Problem：1st, the equal oxide of the precious metal such as Zr, Y, Ti, K containing high level in formula, these oxides are although can have
The fusing point and viscosity of effect adjustment coating, but the production cost of heavy rail product can be caused to increase substantially；2nd, the C added in formula is first
Although element can also adjust the fusing point of coating, C element is burnt CO, CO of generation at high temperature2Can be from the coating melt film for being formed
Middle spilling, so that the compactness of coating lowers, even results in the failure of coating effect.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of inexpensive anticreep carbon coating material of the good Properties of Heavy Rail Steel of effect
And its application.
To solve above-mentioned technical problem, the weight percentage of the taken raw material of the present invention is：River sand 43～52%, Al2O3
Powder 8～15%, B2O3Powder 10～15%, light dolomite 2～5%, iron oxide red powder 12～17%, Na2O powder 1～2%,
LF refining slag 8～11%.
The granularity of coating material of the present invention is in 400～500 mesh.
Application process of the present invention is：After the coating material is mixed with binding agent, Properties of Heavy Rail Steel billet surface is sprayed to.
In application process of the present invention, the coating layer thickness that the spraying is formed is 3～4mm.
In application process of the present invention, the binding agent is water.
Using the beneficial effect produced by above-mentioned technical proposal it is：The present invention can for a long time, be prevented effectively from Properties of Heavy Rail Steel casting
The generation of base surface decarburization phenomenon in heating process, reduces the decarburized layer deepness of casting billet surface；After the present invention, Properties of Heavy Rail Steel
Strand heats 10～12h, its skin decarburization layer depth≤0.4mm in the heating furnace of furnace gas oxygen content >=3%, meets TB/T
The related request of 2344-12；Meanwhile, compared with traditional anticreep carbon coating material, can effectively reduce the making of coating material
Cost, realizes the low cost production of heavy rail product made from steel, and average ton steel reduces by 20 yuan or so of production cost.
The present invention apply guarantee coating low melting point, it is high-viscosity on the basis of, reduce the preparation cost of coating, so as to push away
Enter the low cost production of heavy rail product, for effectively utilizes anticreep carbon coating reduces the practical decarburized depth of casting billet surface, it is ensured that weight
Rail product surface quality it is steady in a long-term, and effectively reduce the production cost of such product, tool is of great significance.
Description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is that 1 Properties of Heavy Rail Steel casting billet surface of embodiment covers anticreep carbon coating the decarburized layer deepness enlarged drawing after heating（×
100 times）；
Fig. 2 is that 2 Properties of Heavy Rail Steel casting billet surface of embodiment covers anticreep carbon coating the decarburized layer deepness enlarged drawing after heating（×100
Times）；
Fig. 3 is that 3 Properties of Heavy Rail Steel casting billet surface of embodiment covers anticreep carbon coating the decarburized layer deepness enlarged drawing after heating（×100
Times）；
Fig. 4 is that comparative example Properties of Heavy Rail Steel casting billet surface does not cover anticreep carbon coating the decarburized layer deepness enlarged drawing after heating（×100
Times）.
Specific embodiment
The inexpensive anticreep carbon coating material of this Properties of Heavy Rail Steel mainly includes SiO2、Al2O3、B2O3、MgO、CaO、Fe2O3、
Na2O, totally 7 kinds of chemical compositions；Which prepares material specifically has：River sand（Main component is：SiO2, 50wt%～65wt%）, pure Al2O3
Powder, pure B2O3Powder, light dolomite（Main component is：MgO 28wt%～32wt%；CaO 68wt%～72wt%）, oxidation
Iron oxide red powder（Main component is：Fe2O397wt%～98wt%）, pure Na2O powder, LF refining slag（Main Ingredients and Appearance is：SiO2
4wt%～18wt%；CaO 35wt%～65wt%；MgO 5wt%～15wt%；Al2O310wt%～40wt%）.
Why this anticreep carbon coating material will contain above-mentioned these chemical compositions, be based primarily upon the effect machine of following compositions
Reason：SiO2It is the solvent of prepares coating material, it can form silicon-oxy tetrahedron in the melt, play in coating material
Skeleton function.It can improve the viscosity of coating material, reduce the melting temperature and solidification temperature of coating material.
B2O3Play a part of a kind of flux in coating material preparation process, its addition can effectively reduce coating
The viscosity of material, melting temperature and solidification temperature.Therefore the softening point of coating material can be effectively reduced, expands the work of coating
Scope.But work as B2O3Addition it is excessive when, it may appear that " boron unusual " phenomenon, i.e.,：When Boron contents are excessive, coating structure meeting
Become loose, so as to affect the isolation effect of coating；Meanwhile, B2O3More serious volatilization phenomenon occurs in sintering procedure,
This is the problem that must be noted that in design process.Therefore B in the coating2O3Content must obtain strict control.
Al2O3It is a kind of amphoteric oxide, it can improve the viscosity and fusion temperature of coating material, but can reduce coating material
The solidification temperature of material.Meanwhile, Al2O3The thermal coefficient of expansion of coating can also be reduced, increases the line expansion system between coating and matrix
Several differences, is conducive to peeling off certainly after coating use.
MgO can reduce viscosity, fusion temperature and the solidification temperature of coating material simultaneously.
CaO can reduce the viscosity of coating material, while the fusion temperature and solidification temperature of coating material can be improved.
Fe2O3The viscosity and fusion temperature of coating material can be reduced, while the solidification temperature of coating material can be improved
Degree.
Na2O can effectively reduce viscosity, fusion temperature and the solidification temperature of coating material, but the material is at high temperature very
Vivaciously, it is easy to corrode matrix, coating is made to react with matrix.So Na2Contents of the O in coating material strictly must be controlled
System.
To guarantee the using effect of anticreep carbon coating material, the delamination depth of Properties of Heavy Rail Steel casting billet surface is effectively reduced, it is necessary to
It is required that the coating material possesses following feature：
（1）Fusing point is relatively low：Guarantee that coating material can be melted at 750～850 DEG C, so that it is guaranteed that coating can be in decarburizing reaction
Just molten state is presented when just occurring, Properties of Heavy Rail Steel casting billet surface is wrapped up.
（2）Coating structure is fine and close：Guarantee that what coating can be fine and close wraps Properties of Heavy Rail Steel casting billet surface, it is to avoid in heating furnace gas
Oxidizing gas penetrate into coat inside, so as to continue that Properties of Heavy Rail Steel strand is aoxidized.
（3）Coating material possesses high viscosity characteristic at high temperature：Guarantee the molten state of coating material temperature be 1150～
Kinematic viscosity when in the range of 1250 DEG C can be maintained at 150～180mm2/ s, it is to avoid because coating material is at high temperature from casting
Base surface flows away and causes the failure of oxidation resistance.
（4）Coating material at low temperature can quick solidification and have relatively low thermal coefficient of expansion, it is ensured that strand go out heating
Furnace rear, coating material can be peeled off from casting billet surface rapidly, so as to not affect the subsequent production of Properties of Heavy Rail Steel.
The river sand of this anticreep carbon coating material selection, light dolomite, refining slag, iron oxide red dusty material are mainly base
In considered below：Containing the chemistry required by coating material in river sand, light dolomite, refining slag, iron oxide red dusty material
Composition, while river sand, light dolomite, refining slag can facilitate from steel-making scene obtain, and iron oxide red powder is that steel rolling is existing
Field processes the side-product of pickle liquor.From above-mentioned material, the preparation cost of anticreep carbon coating material can be greatly reduced, be realized
The low cost production of heavy rail product.But due to containing a certain amount of sulfide in refining slag, and these materials at high temperature can be attached
In casting billet surface, so as to affect follow-up coating material to peel off from casting billet surface, affect the surface quality of heavy rail product made from steel, because
This will strictly control the usage amount of refining slag.
Based on above-mentioned consideration, and Binding experiment room and site test results, this anticreep carbon coating material determines various preparations
The weight proportion of material is respectively：River sand 43～52%, pure Al2O3Powder 8～15%, pure B2O3Powder 10～15%, light-burned white clouds
Stone 2～5%, iron oxide red powder 12～17%, pure Na2O powder 1～2%, LF refining slag 8～11%, above component weight is
100%；With grinder, coating material is ground to into granularity in 400～500 mesh.After testing, the fusing point of this anticreep carbon coating material
For 770～840 DEG C；Kinematic viscosity of its molten state when temperature is in the range of 1150～1250 DEG C can be maintained at 150～
180mm2/s；Simultaneously this material at normal temperatures can quick solidification with relatively low thermal coefficient of expansion, can be in room temperature environment
It is lower rapid from casting billet surface stripping, so as to meet the needs of produced on-site.The cost of this anticreep carbon coating material is more traditional
Anticreep carbon coating reduces 20 yuan/ton or so.
The application process of this anticreep carbon coating material：It is using water as binding agent, equal with above-mentioned anticreep carbon coating material mixing
It is even；Then spray to Properties of Heavy Rail Steel strand（Steel billet）Surface, forms the thin film that thickness is 3～4mm in casting billet surface, so as to for follow-up
Heating technique it is ready.
Embodiment 1-3 and comparative example：In embodiment 1-3, the raw material weight proportioning of soup processed of anticreep carbon coating material is shown in Table 1, spraying
3～4mm of thickness；Heating condition after Properties of Heavy Rail Steel casting billet surface spraying anticreep carbon coating is shown in Table 2, the Properties of Heavy Rail Steel strand table after heating
Face decarburized layer deepness is shown in Table 3.In comparative example, Properties of Heavy Rail Steel casting billet surface does not cover anticreep carbon coating, and its heating condition is shown in Table 2, strand
Skin decarburization layer depth is shown in Table 3.
Table 1：The raw material weight proportioning of soup processed of anticreep carbon coating in each embodiment
| Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| River sand（%） | 52 | 48 | 43 |
| Pure Al2O3Powder（%） | 8 | 9 | 15 |
| Pure B2O3Powder（%） | 10 | 12 | 15 |
| Light dolomite（%） | 5 | 4 | 2 |
| Iron oxide red powder（%） | 16 | 15 | 12 |
| Pure Na2O powder（%） | 1 | 2 | 2 |
| LF refining slag（%） | 8 | 10 | 11 |
| Grain refine degree（Mesh） | 400 | 450 | 500 |
Table 2：The heating condition of each embodiment and comparative example
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example | |
| Heating-up temperature（℃） | 1200 | 1225 | 1250 | 1200 |
| Heat time heating time（h） | 5 | 7.5 | 10 | 5 |
Table 3：Casting billet surface decarburized layer deepness in each embodiment and comparative example
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example | |
| Strand decarburized layer deepness（mm） | 0.26 | 0.28 | 0.45 | 0.8 |
From table 3 it can be seen that being coated with the Properties of Heavy Rail Steel casting billet surface of this anticreep carbon coating material, its decarburized layer deepness is respectively less than
0.5mm, meets the related request of TB/T 2344-12.
Fig. 1-3 is that Properties of Heavy Rail Steel casting billet surface covers anticreep carbon coating the decarburization layer depth after heating in embodiment 1,2 and 3
Degree enlarged drawing（× 100 times）, Fig. 4 is that Properties of Heavy Rail Steel casting billet surface is not covered anticreep carbon coating and heated using 1 conditional of embodiment
Decarburized layer deepness enlarged drawing afterwards（× 100 times）；From Fig. 1-4, this anticreep carbon coating material can be effectively reduced Properties of Heavy Rail Steel
The practical decarburized depth of casting billet surface.
Claims (5)
1. the inexpensive anticreep carbon coating material of a kind of Properties of Heavy Rail Steel, it is characterised in that the weight percentage of its raw material is：River sand
43～52%, Al2O3Powder 8～15%, B2O3Powder 10～15%, light dolomite 2～5%, iron oxide red powder 12～17%,
Na2O powder 1～2%, LF refining slag 8～11%.
2. the inexpensive anticreep carbon coating material of Properties of Heavy Rail Steel according to claim 1, it is characterised in that：The coating material
Granularity be 400～500 mesh.
3. the application of the inexpensive anticreep carbon coating material of Properties of Heavy Rail Steel described in a kind of claim 1, it is characterised in that：The coating
After material is mixed with binding agent, Properties of Heavy Rail Steel billet surface is sprayed to.
4. the application of the inexpensive anticreep carbon coating material of Properties of Heavy Rail Steel according to claim 3, it is characterised in that：The spray
It is 3～4mm to apply the coating layer thickness for being formed.
5. the application of the inexpensive anticreep carbon coating material of the Properties of Heavy Rail Steel according to claim 3 or 4, it is characterised in that：Institute
Binding agent is stated for water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610985391.6A CN106566295B (en) | 2016-11-09 | 2016-11-09 | The inexpensive anticreep carbon coating material of Properties of Heavy Rail Steel and its application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610985391.6A CN106566295B (en) | 2016-11-09 | 2016-11-09 | The inexpensive anticreep carbon coating material of Properties of Heavy Rail Steel and its application |
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| CN106566295B CN106566295B (en) | 2019-01-01 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632137A (en) * | 2003-12-22 | 2005-06-29 | 中南大学 | High efficiency self-stripping high temperature oxidation-prevention/decarbonization coating material |
| CN104109406A (en) * | 2014-05-27 | 2014-10-22 | 中国科学院过程工程研究所 | Water-based protective coating capable of adhering to high temperature billet and preparation method thereof |
-
2016
- 2016-11-09 CN CN201610985391.6A patent/CN106566295B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632137A (en) * | 2003-12-22 | 2005-06-29 | 中南大学 | High efficiency self-stripping high temperature oxidation-prevention/decarbonization coating material |
| CN104109406A (en) * | 2014-05-27 | 2014-10-22 | 中国科学院过程工程研究所 | Water-based protective coating capable of adhering to high temperature billet and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 初建民等: "《冶金石灰生产技术手册》", 30 September 2009, 北京 冶金工业出版社 * |
| 李晶: "《LF精炼技术》", 31 January 2009, 北京 冶金工业出版社 * |
| 王国清等: "《无机化学（供药学类专业用 第3版）》", 31 August 2015, 中国医药科技出版社 * |
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