CN102766742A - Oxidation and decarburization resistant coating powder for high-carbon chromium bearing steel heating process - Google Patents
Oxidation and decarburization resistant coating powder for high-carbon chromium bearing steel heating process Download PDFInfo
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- CN102766742A CN102766742A CN2011101173697A CN201110117369A CN102766742A CN 102766742 A CN102766742 A CN 102766742A CN 2011101173697 A CN2011101173697 A CN 2011101173697A CN 201110117369 A CN201110117369 A CN 201110117369A CN 102766742 A CN102766742 A CN 102766742A
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Abstract
The invention provides a coating powder which is used in the high-carbon chromium bearing steel heating process and simultaneously has oxidation and decarburization resistant functions. The powder comprises the following raw materials of: by weight, 40-70% of rectorite, 15-33% of blast furnace slag, 10-30% of powdered carbon, 0.1-1% of nickel slag, 0.1-1% of molybdenum mineral powder and 1-10% of phosphogypsum. When in use, the powder can be directly adjusted to an appropriate density by the use of water, is applicable to a high-temperature heat treatment process before hot rolling of high-carbon chromium bearing steel, has good oxidation and decarburization resistant effects at 1000-1300 DEG C, and is easy to peel off. In addition, the metal surface quality is good.
Description
Technical field
The present invention relates to the high temperature protective coating of ferrous materials, be specially a kind of high-temp antioxidizing decarburizing coating powder that is used for the preceding high-temperature heat treatment process of high-carbon-chromium bearing steel hot rolling, this powder directly water is in harmonious proportion.
Background technology
Heat treatment technics is widely used in the mechanical property of regulation and control steel workpiece.Under the pyritous oxidizing atmosphere, ferrous materials inevitably can be had an effect with the oxygen in the environment when thermal treatment, causes the dilution etc. of oxidation, decarburization and the alloying element of matrix.The oxidation of matrix and decarburization have restricted the surface quality of becoming a useful person, and have reduced the operating rate of lumber recovery and process furnace.Generally speaking, in order to guarantee the quality of ferrous materials, need the iron scale of matrix surface be removed with high pressure water.For bearing steel, not only want de-scaling, also to adopt mechanical cutting to remove Decarburized layer, caused the significant wastage of the resource and the energy.For this reason, oxidation and decarburization during to ferrous materials thermal treatment generally need be taked certain safeguard procedures, like control Heating temperature and time, control process furnace atmosphere, rationally arrange operational path and stay and put process redundancy, adopt coverture and protective cover etc.Wherein, coating protection is easy to use, cost is lower, is the preferential method of selecting of most domestic iron and steel enterprise.
Present coating protection technology mainly is based on two kinds of different protective mechanisms.A kind of is to rely under the high temperature shield type mechanism that forms the viscous state resist at billet surface, like Chinese patent CN 101210121A; Another kind is to generate fine and close modified oxidized skin through the structure that changes oxide debris, makes the structure of oxide debris and performance improve, thereby plays the response type protective mechanism of high temperature protection, like Chinese patent CN 101462857A.
At present, the high temperature protective coating over-all properties that is used for bearing steel is bad, especially when being higher than 1200 ℃, being used for high-carbon-chromium bearing steel and possessing also shortcoming very of anti-oxidation and the carbon functional coating of anticreep simultaneously.
Chinese patent CN 101486848A has announced a kind of anti-decarburizing coating of high-temp antioxidizing that is used for stainless steel, high temperature steel, and staple is frit, clay, talcum powder, and its protection TR is at 900 ℃～1200 ℃.Chinese patent CN 1632137A has announced a kind of coating that prevents steel workpiece oxidation/decarburization when thermal treatment, mainly by TiO
2, Al
2O
3, SiO
2, glass powder, enhancement type carbon dust and sticker form, its protection TR is at 800 ℃～1200 ℃.The common defects that above-mentioned two kinds of coating exist is to protect temperature all below 1200 ℃, is not suitable for the protection of 1200～1300 ℃ of high temperature section.Chinese patent CN 101624643A has announced that a kind of warm forming production process that is used for has the coating that prevents steel plate oxidation and decarburization, and this coating makes that the cost of this coating is higher owing to adopted nano raw material.
Summary of the invention
The purpose of this invention is to provide and have anti-oxidation and the carbon functional coating powder of anticreep when using in the heat-processed before a kind of high-carbon-chromium bearing steel hot rolling, to solve the vigorous oxidation of hot rolling bearing steel in heat treatment process and serious decarburization problem.
The coating that after water is in harmonious proportion, forms with this coating powder of the present invention has high-temp antioxidizing and anti-decarburization function preferably to bearing steel, and the lumber recovery of hot rolling bearing steel is improved.
Purpose according to the invention realizes through following scheme:
Of the present invention have anti-oxidation and the carbon functional coating powder of anticreep to bearing steel, by being made up of following raw materials by weight: 40%～70% tired stone, 15%～33% blast furnace slag of taking off; 10%～30% carbon dust; 0.1%～1% nickel slag, 0.1%～1% molybdenum ore powder, 1%～10% phosphogypsum.The screening formulation of above-mentioned coating powder is: 40%～60% tired takes off stone, 20%～30% blast furnace slag, 10%～25% carbon dust, 0.25%～0.5% nickel slag, 0.5%～0.75% molybdenum ore powder, 5%～10% phosphogypsum.Powder stock requires as follows: tired purity＞95% that takes off stone, and granularity is between 200～250 μ m; The purity of blast furnace slag＞90%, granularity is between 200～250 μ m; The purity of carbon dust＞98%, granularity is at 100～150 μ m; The purity of nickel slag＞90%, granularity is between 150～200 μ m; The purity of molybdenum ore powder and phosphogypsum is all greater than 95%, and granularity is all between 150～200 μ m.
Directly water is as blending agents in use for this powder, and the ratio of powder and water is 2: 1.
Coating powder of the present invention can adopt conventional coating method to carry out behind water concocting; For example through dip-coating; Spraying or brushing method begin and can heat up with the temperature rise rate of 10 ℃/min from normal temperature, at 1000～1300 ℃ anti-oxidation preferably and anti-decarburization effect are arranged.
Advantage of the present invention and positively effect fully show the following aspects:
1. of the present invention have anti-oxidation and the carbon functional coating powder of anticreep major part to bearing steel and derive from industrial breeze or slag, can solve the problem of environmental pollution that causes in the phosphogypsum stacking process, reached the purpose that makes full use of resource;
2. powder of the present invention presents sintered state under 800～1300 ℃, be utilized in the oxidation that the principle that generates dense structure on the steel surface effectively reduces the steel surface, and the carbon dust in the powder carries out oxidizing reaction prior to the carbon in the steel, reaches the purpose of effective reduction steel decarburization;
3. coating powder of the present invention because thermal expansivity and high-carbon-chromium bearing steel have very big-difference, can guarantee that coating peels off naturally in process of cooling, the bearing steel surface after peeling off still has original metalluster, and steel top layer chemical ingredients is constant basically.
Embodiment
Further specify the present invention through embodiment below.In following examples, represent oxidation-protective effect with (burn out rate one of check sample has the burn out rate of coating sample)/(burn out rate of check sample) * 100, this numerical value is big more, explains that oxidation-protective effect is good more; Characterize anti-decarburization effect with practical decarburized depth, this numerical value is more little, explains that anti-decarburization effect is good more.
Embodiment 1
1.1
#Sample: composition proportion
| The tired stone that takes off | Blast furnace slag | Carbon dust | The nickel slag | The molybdenum ore powder | Phosphogypsum |
| 60％ | 20％ | 12％ | 0.5％ | 0.5％ | 7％ |
1.2
#Sample: composition proportion
| The tired stone that takes off | Blast furnace slag | Carbon dust | The nickel slag | The molybdenum ore powder | Phosphogypsum |
| 50％ | 30％ | 12％ | 0.5％ | 0.5％ | 7％ |
The ratio of powder and water is 2: 1
GCr15 bearing round steel sample with φ 10mm experimentizes, and initial steel appearance does not have Decarburized layer, and the height of each sample is 50mm.Sample is heated to earlier 400 ℃～500 ℃ greasy dirts of removing the surface in process furnace, with the remaining dirt and the iron rust of dilute hydrochloric acid solution clean surface, then with ultrasonic oscillation washing three times, dry back is subsequent use.
Above-mentioned two kinds of coating powders are obtained two kinds of coating through water concocting, carry out high-temp antioxidizing decarburization experiment, adopt normal temperature dip-coating mode, rise to 1250 ℃, be incubated 1 hour then with the heat-up rate of 10 ℃/min at the GCr15 of φ 10mm bearing round steel.Investigated the anti-oxidation decarburizing effect of these two kinds of coating, the result sees table 1, and in the refrigerative process, coating is prone to peel off, and anti-decarburization effect meets in the GB/T 18254-2002 standard requirement to practical decarburized depth.
Table 1
| Coating | Burn out rate (%) | Oxidation-protective effect (%) | Total decarburized layer thickness (μ m) |
| 1.1 #Sample | 9.17 | 64.37 | 178 |
| 1.2 #Sample | 10.05 | 60.95 | 152 |
| No coating sample | 25.74 | - | 827 |
Embodiment 2
2.1
#Sample: composition proportion
| The tired stone that takes off | Blast furnace slag | Carbon dust | The nickel slag | The molybdenum ore powder | Phosphogypsum |
| 48％ | 30％ | 15％ | 0.5％ | 0.5％ | 6％ |
2.2
#Sample: composition proportion
| The tired stone that takes off | Blast furnace slag | Carbon dust | The nickel slag | The molybdenum ore powder | Phosphogypsum |
| 40％ | 25％ | 25％ | 0.25％ | 0.75％ | 9％ |
The ratio of powder and water is 2: 1
GCr15SiMo bearing round steel sample with φ 10mm experimentizes, steel appearance treatment process and experimental technique all with embodiment 1 in identical.Above-mentioned two kinds of coating powders are obtained two kinds of coating through water concocting, carry out high-temp antioxidizing decarburization experiment, 1 at the GCr15SiMo of φ 10mm bearing round steel
#With 2
#All can prevent GCr15SiMo oxidation and decarburization, and 2
#Anti-oxidation and anti-decarburization effect is better than 1# sample.
Claims (3)
1. high temperature protective coating powder that is used for high-carbon-chromium bearing steel; It is characterized in that said coating powder is made up of following raw materials by weight: 40%～70% tired stone, 15%～33% blast furnace slag of taking off; 10%～30% carbon dust; 0.1%～1% nickel slag, 0.1%～1% molybdenum ore powder, 1%～10% phosphogypsum.
2. by the described a kind of high temperature protective coating powder that is used for high-carbon-chromium bearing steel of claim 1; It is characterized in that said coating powder is made up of following raw materials by weight: 40%～60% tired stone, 20%～30% blast furnace slag of taking off; 10%～25% carbon dust; 0.25%～0.5% nickel slag, 0.5%～0.75% molybdenum ore powder, 5%～10% phosphogypsum.
3. by claim 1 or the described a kind of high temperature protective coating powder that is used for high-carbon-chromium bearing steel of claim 2, it is characterized in that powder stock requires as follows: tired purity＞95% that takes off stone, granularity is between 200～250 μ m; The purity of blast furnace slag＞90%, granularity is between 200～250 μ m; The purity of carbon dust＞98%, granularity is at 100～150 μ m; The purity of nickel slag＞90%, granularity is between 150～200 μ m; The purity of molybdenum ore powder and phosphogypsum is all greater than 95%, and granularity is all between 150～200 μ m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110117369 CN102766742B (en) | 2011-05-06 | 2011-05-06 | Oxidation and decarburization resistant coating powder for high-carbon chromium bearing steel heating process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110117369 CN102766742B (en) | 2011-05-06 | 2011-05-06 | Oxidation and decarburization resistant coating powder for high-carbon chromium bearing steel heating process |
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| CN102766742A true CN102766742A (en) | 2012-11-07 |
| CN102766742B CN102766742B (en) | 2013-07-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110760653A (en) * | 2019-11-26 | 2020-02-07 | 宝钢特钢韶关有限公司 | Control method for preventing bearing steel from decarbonizing |
| CN111644613A (en) * | 2020-06-30 | 2020-09-11 | 石家庄钢铁有限责任公司 | High-carbon-chromium GCr15 bearing steel spherical powder and preparation method thereof |
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| 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 |
| CN104109406B (en) * | 2014-05-27 | 2016-06-22 | 中国科学院过程工程研究所 | A kind of water base protective coating adhering to high temperature billet steel and preparation method thereof |
| CN110760653A (en) * | 2019-11-26 | 2020-02-07 | 宝钢特钢韶关有限公司 | Control method for preventing bearing steel from decarbonizing |
| CN110760653B (en) * | 2019-11-26 | 2021-04-16 | 宝钢特钢韶关有限公司 | Control method for preventing bearing steel from decarbonizing |
| CN111644613A (en) * | 2020-06-30 | 2020-09-11 | 石家庄钢铁有限责任公司 | High-carbon-chromium GCr15 bearing steel spherical powder and preparation method thereof |
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| CN102766742B (en) | 2013-07-10 |
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Effective date of registration: 20230821 Address after: Room 402, Unit 5, Building 1, No. 688 Qiushi Road, Jinshanwei Town, Jinshan District, Shanghai, 200333 Patentee after: Shanghai Fanggan New Material Technology Co.,Ltd. Address before: 100190 No. two, No. 1, North Haidian District, Beijing, Zhongguancun Patentee before: Institute of Process Engineering, Chinese Academy of Sciences |
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