CN103451396A - Processing method for preventing decarbonization of high-carbon steel billet - Google Patents
Processing method for preventing decarbonization of high-carbon steel billet Download PDFInfo
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- CN103451396A CN103451396A CN 201310417239 CN201310417239A CN103451396A CN 103451396 A CN103451396 A CN 103451396A CN 201310417239 CN201310417239 CN 201310417239 CN 201310417239 A CN201310417239 A CN 201310417239A CN 103451396 A CN103451396 A CN 103451396A
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Abstract
The invention relates to a processing method for preventing decarbonization of a high-carbon steel billet. The method is characterized in that the surface of the high-carbon steel billet is coated with an anti-decarbonization coating before heating the high-carbon steel billet. Compared with the prior art, the coating provided by the invention has an obvious effect in preventing further decarbonization of the steel billet as well as the characteristics of moderate viscosity, good leveling property, short curing time, high bonding strength of the coating and the like; the coating is safe to use without pollution; the coating can be automatically stripped after the steel billet rolling. The protection coating provided by the invention is applied to the surface of a continuous-rolling steel billet by a brush-coating, roller-coating or spray-coating technology, wherein the coating thickness is 0.6-0.8mm; then the steel billet is heated and rolled to effectively prevent further decarbonization. The heating method can control the depth of the decarbonization layer on the surface of the steel billet within a shallow range; the heating time is short, and the energy is saved; without increasing the cost or labor intensity, the method is particularly suitable for heating high-carbon tool steel and bearing steel in soaking pit and walking type heating furnaces.
Description
Technical field
The present invention relates to a kind of working method that prevents the high-carbon steel billet decarburization.
Background technology
In smelter, the heating of steel billet is a requisite procedure in mill product steel process, and oxidation and decarburization inevitably occur exposed steel billet when heating.Surface oxidation, in the heating rolling process, occurs in general steel billet, generates a large amount of iron scales, and form Decarburized layer at billet surface, make the surface decarburization layer of finished product material thicker (approximately 0.6 1.0mm left and right), thereby cause the finished steel surface hardness low, wear resistance is poor.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of technical scheme that prevents the working method of high-carbon steel billet decarburization.
Described a kind of working method that prevents the high-carbon steel billet decarburization is characterized in that: first at high-carbon steel billet, show to apply anti-decarburizing coating, then high-carbon steel billet is heated;
The component that described anti-decarburizing coating contains following weight percent: C:15% 35%, SiO
2: 25% 45%, CaO:O% 15%, MgO:O% 10%, A1
2o
3: 0% 15%, R
20:5% 20%, and all the other are water;
Described heating means comprise warming up period, heating period and soak, adopt strong oxidizing property atmosphere heating steel billet in heating period, and coefficient of excess air is controlled between 1.2 1.4; Heating period, steel billet temperature was 700 1250 ℃, and in stove, temperature is controlled between 1,000 1350 ℃; The temperature of warming up period steel billet is room temperature to 700 ℃, and the furnace air coefficient of excess is controlled between 1.0 1.4; The soak steel billet temperature is 1,150 1250 ℃, and in stove, temperature is controlled between 1,200 1250 ℃, and coefficient of excess air is controlled between 1.0 1.4.
Described a kind of working method that prevents the high-carbon steel billet decarburization, it is characterized in that described process furnace at the maximum heating temperature of heating period higher than 50 150 ℃ of soaks.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 30%, A1
2o
3: 5%, R
20:20%, all the other are water.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:20%, Si0
2: 25%, CaO:15%, A1
2o
3: 15%, R
20:15%, all the other are water.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:25%, Si0
2: 25%, MgO:5%, A1
2o
3: 15%, R
20:15%, all the other are water.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 45%, CaO:5%, R
20:5%, all the other are water.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:30%, Si0
2: 30%, CaO:5%, A1
2o
3: 5%, R
20:10%, all the other are water.
Described a kind of working method that prevents the high-carbon steel billet decarburization, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:35%, Si0
2: 25%, CaO:2%, MgO:10%, R
20:10%, all the other are water.
Coating provided by the invention compared with prior art, except preventing that steel billet is again the decarburization successful, also have that modest viscosity, good leveling property, set time are short, the anchoring strength of coating high, use safety, pollution-free, coating can automatically be peeled off after steel billet rolls.By protective cover provided by the invention, adopt brushing, roller coat or spraying coating process, be coated on the tandem rolling billet surface, coat-thickness is 0.6 0.8mm, then heating rolling, can effectively prevent decarburization again.And heating means of the present invention can make the decarburized layer deepness of billet surface be controlled in more shallow scope; Heat-up time is short, save energy: do not increase cost, do not increase labour intensity, be particularly useful for soaking pit and walking beam furnace heating high-carbon class tool steel and bearing steel.
Embodiment
The present invention prevents the working method of high-carbon steel billet decarburization, first at high-carbon steel billet, shows to apply anti-decarburizing coating, then high-carbon steel billet is heated;
The component that anti-decarburizing coating contains following weight percent: C:15% 35%, SiO
2: 25% 45%, CaO:O% 15%, MgO:O% 10%, A1
2o
3: 0% 15%, R
20:5% 20%, and all the other are water;
Heating means comprise warming up period, heating period and soak, adopt strong oxidizing property atmosphere heating steel billet in heating period, and coefficient of excess air is controlled between 1.2 1.4; Heating period, steel billet temperature was 700 1250 ℃, and in stove, temperature is controlled between 1,000 1350 ℃; The temperature of warming up period steel billet is room temperature to 700 ℃, and the furnace air coefficient of excess is controlled between 1.0 1.4; The soak steel billet temperature is 1,150 1250 ℃, and in stove, temperature is controlled between 1,200 1250 ℃, and coefficient of excess air is controlled between 1.0 1.4.
Note, process furnace at the maximum heating temperature of heating period higher than 50 150 ℃ of soaks.
Embodiment 1
The component that anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 30%, A1
2o
3: 5%, R
20:20%, all the other are water.
Embodiment 2
The component that anti-decarburizing coating contains following weight percent: C:20%, Si0
2: 25%, CaO:15%, A1
2o
3: 15%, R
20:15%, all the other are water.
Embodiment 3
The component that anti-decarburizing coating contains following weight percent: C:25%, Si0
2: 25%, MgO:5%, A1
2o
3: 15%, R
20:15%, all the other are water.
Embodiment 4
The component that anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 45%, CaO:5%, R
20:5%, all the other are water.
Embodiment 5
The component that anti-decarburizing coating contains following weight percent: C:30%, Si0
2: 30%, CaO:5%, A1
2o
3: 5%, R
20:10%, all the other are water.
Embodiment 6
The component that anti-decarburizing coating contains following weight percent: C:35%, Si0
2: 25%, CaO:2%, MgO:10%, R
20:10%, all the other are water.
Coating provided by the invention compared with prior art, except preventing that steel billet is again the decarburization successful, also have that modest viscosity, good leveling property, set time are short, the anchoring strength of coating high, use safety, pollution-free, coating can automatically be peeled off after steel billet rolls.By protective cover provided by the invention, adopt brushing, roller coat or spraying coating process, be coated on the tandem rolling billet surface, coat-thickness is 0.6 0.8mm, then heating rolling, can effectively prevent decarburization again.And heating means of the present invention can make the decarburized layer deepness of billet surface be controlled in more shallow scope; Heat-up time is short, save energy: do not increase cost, do not increase labour intensity, be particularly useful for soaking pit and walking beam furnace heating high-carbon class tool steel and bearing steel.
Claims (8)
1. a working method that prevents the high-carbon steel billet decarburization, is characterized in that: first at high-carbon steel billet, show to apply anti-decarburizing coating, then high-carbon steel billet is heated; The component that described anti-decarburizing coating contains following weight percent: C:15% 35%, SiO
2: 25% 45%, CaO:O% 15%, MgO:O% 10%, A1
2o
3: 0% 15%, R
20:5% 20%, and all the other are water; Described heating means comprise warming up period, heating period and soak, adopt strong oxidizing property atmosphere heating steel billet in heating period, and coefficient of excess air is controlled between 1.2 1.4; Heating period, steel billet temperature was 700 1250 ℃, and in stove, temperature is controlled between 1,000 1350 ℃; The temperature of warming up period steel billet is room temperature to 700 ℃, and the furnace air coefficient of excess is controlled between 1.0 1.4; The soak steel billet temperature is 1,150 1250 ℃, and in stove, temperature is controlled between 1,200 1250 ℃, and coefficient of excess air is controlled between 1.0 1.4.
2. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, it is characterized in that described process furnace at the maximum heating temperature of heating period higher than 50 150 ℃ of soaks.
3. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 30%, A1
2o
3: 5%, R
20:20%, all the other are water.
4. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:20%, Si0
2: 25%, CaO:15%, A1
2o
3: 15%, R
20:15%, all the other are water.
5. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:25%, Si0
2: 25%, MgO:5%, A1
2o
3: 15%, R
20:15%, all the other are water.
6. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:15%, Si0
2: 45%, CaO:5%, R
20:5%, all the other are water.
7. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:30%, Si0
2: 30%, CaO:5%, A1
2o
3: 5%, R
20:10%, all the other are water.
8. a kind of working method that prevents the high-carbon steel billet decarburization according to claim 1, is characterized in that the component that described anti-decarburizing coating contains following weight percent: C:35%, Si0
2: 25%, CaO:2%, MgO:10%, R
20:10%, all the other are water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310417239 CN103451396A (en) | 2013-09-13 | 2013-09-13 | Processing method for preventing decarbonization of high-carbon steel billet |
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|---|---|---|---|
| CN 201310417239 CN103451396A (en) | 2013-09-13 | 2013-09-13 | Processing method for preventing decarbonization of high-carbon steel billet |
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| CN103451396A true CN103451396A (en) | 2013-12-18 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105269256A (en) * | 2014-07-25 | 2016-01-27 | 蒂森克虏伯钢铁欧洲股份公司 | Method for Producing a Profile and a Manufacturing System for Producing a Profile |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN109112280A (en) * | 2018-08-07 | 2019-01-01 | 南京钢铁股份有限公司 | A kind of control method of bearing steel wire rod decarburized depth |
| CN109174976A (en) * | 2018-08-28 | 2019-01-11 | 武汉钢铁有限公司 | A kind of milling method reducing medium high carbon Strip practical decarburized depth |
| CN110814242A (en) * | 2019-12-02 | 2020-02-21 | 义乌紫英机械科技有限公司 | Decarbonization preventing equipment for hot forging |
| CN111394555A (en) * | 2020-05-26 | 2020-07-10 | 江苏联峰实业有限公司 | GCr15 bearing steel with low decarburization depth and preparation method thereof |
-
2013
- 2013-09-13 CN CN 201310417239 patent/CN103451396A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105269256A (en) * | 2014-07-25 | 2016-01-27 | 蒂森克虏伯钢铁欧洲股份公司 | Method for Producing a Profile and a Manufacturing System for Producing a Profile |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN109112280A (en) * | 2018-08-07 | 2019-01-01 | 南京钢铁股份有限公司 | A kind of control method of bearing steel wire rod decarburized depth |
| CN109174976A (en) * | 2018-08-28 | 2019-01-11 | 武汉钢铁有限公司 | A kind of milling method reducing medium high carbon Strip practical decarburized depth |
| CN110814242A (en) * | 2019-12-02 | 2020-02-21 | 义乌紫英机械科技有限公司 | Decarbonization preventing equipment for hot forging |
| CN110814242B (en) * | 2019-12-02 | 2020-12-22 | 平阳县中锻机械有限公司 | Decarbonization preventing equipment for hot forging |
| CN111394555A (en) * | 2020-05-26 | 2020-07-10 | 江苏联峰实业有限公司 | GCr15 bearing steel with low decarburization depth and preparation method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20131218 |