CN111101058A - High-wear-resistance graphite steel edge rolling roller of section steel-rail beam rolling mill and manufacturing method thereof - Google Patents
High-wear-resistance graphite steel edge rolling roller of section steel-rail beam rolling mill and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a high-wear-resistance graphite steel edge rolling roller of a section steel-rail beam rolling mill and a manufacturing method thereof, belonging to the technical field of edge rolling rollers, wherein the manufacturing method mainly comprises the steps of smelting, pouring and heat treatment, the inoculation treatment comprises ladle bottom inoculation before tapping, stream inoculation in the tapping process and casting inoculation in the pouring process, inoculants are Fe-Si particles and Si-Ca particles, and 5-10Kg of molten steel of 1 ton is added; rare earth ferrosilicon magnesium nodulizer is used for nodulizing, and the nodulizer is flushed along with steel flow in the tapping process; and after tapping, argon blowing treatment is carried out on the molten steel in the ladle to ensure that the temperature of the molten steel reaches a pouring temperature which is higher than the melting point temperature of the molten steel by more than 50 ℃, and then pouring is carried out. The invention has high wear resistance, excellent heat crack resistance and accident impact resistance, can improve the steel adhesion resistance of the edge rolling roll, and improves the machine period and the rolling efficiency.
Description
Technical Field
The invention relates to a high-wear-resistance graphite steel edge rolling roller of a section steel-rail beam rolling mill and a manufacturing method thereof, belonging to the technical field of edge rolling rollers.
Background
When the edging frame of the section steel-rail beam universal rolling mill works, the flange end of the section steel is in contact with grooves at two ends of the roller body of the edging roller, the main working surface of the roller is the grooves at two ends of the roller body, the section steel flange exerts saw-cutting abrasion on the grooves, and the roller of the edging frame must have good abrasion resistance and accident resistance, namely, the edging roller is required to have higher abrasion resistance, and meanwhile, the hardness drop is small. In addition, the effective area of the roll body bearing the rolling force after the roll is grooved is reduced, and particularly for some rolls with deeper grooves, the rolls must have certain toughness in order to ensure the normal use of the rolls.
The edge rolling roller of the existing section steel-rail beam universal rolling mill can be made of alloy cast steel, semisteel, high-carbon semisteel and the like, and the alloy cast steel has high roller strength and good strength and toughness, but has poor wear resistance and short machine period; the semi-steel and the high-carbon semi-steel have better wear resistance, but the accident resistance and the toughness need to be further improved. The graphite steel contains high Ni, Cr and Mo alloy elements, and through reasonable control of the content and corresponding proportion of graphitized elements and carbide forming elements and reasonable smelting, casting and heat treatment processes, the matrix structure has fine grained and rod-shaped carbides with high microhardness to form wear-resistant particles with good wear resistance, and the spherical graphite prevents thermal fatigue cracks from occurring and expanding, so that the graphite steel has certain heat cracking resistance and accident resistance.
Disclosure of Invention
The invention aims to provide a high-wear-resistance graphite steel edge rolling roller of a section steel-rail beam rolling mill and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high wear-resisting graphite steel edge rolling roller for section steel-rail beam rolling mill includes the following steps:
firstly, putting the selected raw materials into an electric arc furnace, smelting by adopting an oxidation method, and adjusting chemical components;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process;
fourthly, adding a nodulizer in the tapping process in the third step, wherein the nodulizer rushes into a steel ladle along with the steel flow;
fifthly, blowing argon to the molten steel in the ladle for a period of time after tapping is finished;
sixthly, when the temperature of the molten steel reaches the pouring temperature in the step five, pouring, and simultaneously performing casting inoculation in the pouring process;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step;
eighthly, machining the castings after the spheroidizing annealing is finished in the step seven, normalizing the castings, and then cooling the castings;
and step nine, stopping cooling when the temperature is cooled to a certain temperature in the step eight, and performing tempering treatment to obtain the high-wear-resistance graphite steel edge rolling roller.
The technical scheme of the invention is further improved as follows: in the first step, the raw material alloy components and the weight percentage of each alloy component are as follows: 1.80-2.50%, Si: 1.20-2.20%, Mn: 0.50-1.20 percent of P, less than or equal to 0.03 percent of P; s is less than or equal to 0.03%, Cr: 0.60 to 1.50%, Ni: 0.20 to 1.00%, Mo: 0.20-1.00%, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved as follows: secondly, inoculating agents used for inoculation in the third step and the sixth step are Fe-Si particles and Si-Ca particles, and 5-10Kg of inoculating agent is added into 1 ton of molten steel; wherein the grain size of the inoculant added along with the casting inoculation is 1-3 mm.
The technical scheme of the invention is further improved as follows: the nodulizer in the fourth step is a rare earth ferrosilicon magnesium nodulizer.
The technical scheme of the invention is further improved as follows: and fifthly, the sedation time is more than or equal to 10 min.
The technical scheme of the invention is further improved as follows: and sixthly, the pouring temperature is more than 50 ℃ of the melting point temperature of the molten steel.
The technical scheme of the invention is further improved as follows: the annealing temperature of the seventh step is 700-.
The technical scheme of the invention is further improved as follows: the normalizing temperature of the step eight is 950-.
The technical scheme of the invention is further improved as follows: step nine, stopping cooling after cooling to 450-600 ℃, wherein the tempering temperature is 550-600 ℃.
The technical scheme of the invention is further improved as follows: and in the step eight, the normalizing cooling adopts an air cooling mode and an air cooling mode.
Due to the adoption of the technical scheme, the invention has the following technical effects:
the smelting is carried out in an electric arc furnace, an oxidation method is adopted for smelting, the tasks in an oxidation period are to remove P and gas and non-metallic inclusions in metal, oxygen and sulfur in molten steel are removed in a reduction period, and chemical components are adjusted to meet requirements.
The normalizing cooling in the heat treatment of the invention adopts air cooling and air cooling modes, thus not only reaching proper hardness, but also avoiding cracks generated at too fast cooling speed.
The invention reasonably controls the content and the corresponding proportion of the graphitized element and the carbide forming element, so that the comprehensive performance is suitable for the requirements of the edge rolling roller of the section steel-rail beam universal rolling mill.
The inoculation treatment comprises ladle bottom inoculation before tapping, stream inoculation in the tapping process and casting inoculation in the casting process, so that the form, distribution and content of graphite in the structure are ensured, and the heat crack resistance and the accident resistance of the roller are ensured.
Drawings
FIG. 1 is a photograph of a 50X metallographic graphite according to the invention;
FIG. 2 is a photograph of a 100X metallographic structure of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments:
the invention discloses a high wear-resistant graphite steel edge rolling roller of a section steel-rail beam rolling mill and a manufacturing method thereof, which have high wear resistance, excellent thermal cracking resistance and accident impact resistance, improved steel adhesion resistance of the edge rolling roller and improved machine period and rolling efficiency by reasonably controlling the content and corresponding proportion of graphitized elements and carbide forming elements and reasonable smelting, pouring and heat treatment processes. The method comprises the following steps:
firstly, placing the selected raw materials into an electric arc furnace to be smelted by an oxidation method, wherein the raw material alloy components and the weight percentage of each alloy component are as follows: 1.80-2.50%, Si: 1.20-2.20%, Mn: 0.50-1.20 percent of P, less than or equal to 0.03 percent of P; s is less than or equal to 0.03%, Cr: 0.60 to 1.50%, Ni: 0.20 to 1.00%, Mo: 0.20-1.00%, and the balance of Fe and inevitable impurities; the oxidation period is used for removing P and removing gas and non-metallic inclusions in metal, the reduction period is used for removing oxygen and sulfur in molten steel, and chemical components are adjusted to meet requirements;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging; the inoculant is Fe-Si particles and Si-Ca particles, and 5-10Kg of inoculant is added into 1 ton of molten steel;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process; the inoculant is Fe-Si particles and Si-Ca particles, and 5-10Kg of inoculant is added into 1 ton of molten steel;
fourthly, adding a rare earth ferrosilicon magnesium nodulizer into the steel tapping process in the third step, and flushing the nodulizer into a steel ladle along with steel flow;
fifthly, blowing argon to calm molten steel in the ladle for a period of time after tapping is finished, wherein the calm time is more than or equal to 10 min;
sixthly, when the temperature of the molten steel in the step five is higher than the melting point temperature of the molten steel by more than 50 ℃, pouring, and simultaneously performing casting inoculation in the pouring process; the inoculant is Fe-Si particles and Si-Ca particles, 5-10Kg of inoculant is added into 1 ton of molten steel according to the proportion, and the granularity of the inoculant is 1-3 mm;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step, wherein the annealing temperature is 700-800 ℃;
eighthly, performing normalizing treatment after machining the casting subjected to spheroidizing annealing in the step seven, wherein the normalizing temperature is 950 ℃ and 1000 ℃, and then adopting air cooling and air cooling modes;
and step nine, stopping cooling when the temperature is cooled to 500 ℃ in the step eight, and performing tempering treatment at the temperature of 550 ℃ and 600 ℃ for 25-35h to obtain the high-wear-resistance graphite steel edge rolling roller.
Detecting the obtained high-wear-resistance graphite steel edge rolling roller, wherein the alloy components in percentage by weight are as follows: 1.80-2.50%, Si: 1.20-2.20%, Mn: 0.50-1.20 percent of P, less than or equal to 0.03 percent of P; s is less than or equal to 0.03%, Cr: 0.60 to 1.50%, Ni: 0.20 to 1.00%, Mo: 0.20-1.00%, and the balance of Fe and inevitable impurities; the working layer of the high-wear-resistance graphite steel edge rolling roller has the hardness of 53-55 HSD, high wear resistance, excellent heat crack resistance and accident impact resistance, and simultaneously the steel adhesion resistance of the edge rolling roller can be improved, the metallographic structure is shown in figures 1 and 2, and the comprehensive performance is suitable for the requirements of the edge rolling roller of a section steel-rail beam universal rolling mill.
The following are specific examples of the present invention:
example 1
Firstly, placing the selected raw materials into an electric arc furnace to be smelted by an oxidation method, wherein the raw material alloy components and the weight percentage of each alloy component are as follows: 1.80%, Si: 1.20%, Mn: 0.50%, Cr: 0.60%, Ni: 0.20%, Mo: 0.20 percent and the attached P is less than or equal to 0.03 percent; less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the oxidation period is used for removing P and removing gas and non-metallic inclusions in metal, the reduction period is used for removing oxygen and sulfur in molten steel, and chemical components are adjusted to meet requirements;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging; the inoculant is Fe-Si particles and Si-Ca particles, and 5Kg of inoculant is added into 1 ton of molten steel;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process; the inoculant is Fe-Si particles and Si-Ca particles, and 5Kg of inoculant is added into 1 ton of molten steel;
fourthly, adding a rare earth ferrosilicon magnesium nodulizer into the steel tapping process in the third step, and flushing the nodulizer into a steel ladle along with steel flow;
fifthly, after tapping is finished, argon blowing and calming are carried out on molten steel in the ladle for a period of time, and the calming time is 10 min;
sixthly, when the temperature of the molten steel in the step five is higher than the melting point temperature of the molten steel by 50 ℃, pouring, and simultaneously performing casting inoculation in the pouring process; the inoculant is Fe-Si particles and Si-Ca particles, 5Kg of inoculant is added into 1 ton of molten steel according to the proportion, and the granularity of the inoculant is 1 mm;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step, wherein the annealing temperature is 700 ℃;
eighthly, performing normalizing treatment after machining the casting subjected to spheroidizing annealing in the step seven, wherein the normalizing temperature is 950 ℃, and then adopting air cooling and air cooling modes;
and step nine, stopping cooling when the temperature is cooled to 450 ℃ in the step eight, and tempering at the tempering temperature of 550 ℃ for 25 hours to obtain the high-wear-resistance graphite steel edge rolling roller.
Example 2
Firstly, placing the selected raw materials into an electric arc furnace to be smelted by an oxidation method, wherein the raw material alloy components and the weight percentage of each alloy component are as follows: 2.50%, Si: 2.20%, Mn: 1.20%, Cr: 1.50%, Ni: 1.00%, Mo: 1.00 percent and the attached P is less than or equal to 0.03 percent; less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the oxidation period is used for removing P and removing gas and non-metallic inclusions in metal, the reduction period is used for removing oxygen and sulfur in molten steel, and chemical components are adjusted to meet requirements;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging; the inoculant is Fe-Si particles and Si-Ca particles, and 10Kg of inoculant is added into 1 ton of molten steel;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process; the inoculant is Fe-Si particles and Si-Ca particles, and 10Kg of inoculant is added into 1 ton of molten steel;
fourthly, adding a rare earth ferrosilicon magnesium nodulizer into the steel tapping process in the third step, and flushing the nodulizer into a steel ladle along with steel flow;
fifthly, after tapping is finished, argon blowing and calming are carried out on molten steel in the ladle for a period of time, and the calming time is 15 min;
sixthly, when the temperature of the molten steel in the step five is higher than the melting point temperature of the molten steel by 55 ℃, pouring, and simultaneously performing casting inoculation in the pouring process; the inoculant is Fe-Si particles and Si-Ca particles, 10Kg of inoculant is added into 1 ton of molten steel according to the proportion, and the granularity of the inoculant is 3 mm;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step, wherein the annealing temperature is 800 ℃;
eighthly, performing normalizing treatment after machining the casting subjected to spheroidizing annealing in the step seven, wherein the normalizing temperature is 1000 ℃, and then adopting air cooling and air cooling modes;
and step nine, stopping cooling when the temperature is cooled to 500 ℃ in the step eight, and tempering at the tempering temperature of 600 ℃ for 35 hours to obtain the high-wear-resistance graphite steel edge rolling roller.
Example 3
Firstly, placing the selected raw materials into an electric arc furnace to be smelted by an oxidation method, wherein the raw material alloy components and the weight percentage of each alloy component are as follows: 2%, Si: 2%, Mn: 1%, Cr: 1%, Ni: 0.50%, Mo: 0.50 percent and the attached P is less than or equal to 0.03 percent; less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the oxidation period is used for removing P and removing gas and non-metallic inclusions in metal, the reduction period is used for removing oxygen and sulfur in molten steel, and chemical components are adjusted to meet requirements;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging; the inoculant is Fe-Si particles and Si-Ca particles, and 8Kg of inoculant is added into 1 ton of molten steel;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process; the inoculant is Fe-Si particles and Si-Ca particles, and 8Kg of inoculant is added into 1 ton of molten steel;
fourthly, adding a rare earth ferrosilicon magnesium nodulizer into the steel tapping process in the third step, and flushing the nodulizer into a steel ladle along with steel flow;
fifthly, after tapping is finished, argon blowing and calming are carried out on molten steel in the ladle for a period of time, and the calming time is 20 min;
sixthly, when the temperature of the molten steel in the step five is higher than the melting point temperature of the molten steel by 60 ℃, pouring, and simultaneously performing casting inoculation in the pouring process; the inoculant is Fe-Si particles and Si-Ca particles, 7Kg of inoculant is added into 1 ton of molten steel according to the proportion, and the granularity of the inoculant is 2 mm;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step, wherein the annealing temperature is 750 ℃;
eighthly, performing normalizing treatment after machining the casting subjected to spheroidizing annealing in the step seven, wherein the normalizing temperature is 980 ℃, and then adopting air cooling and air cooling modes;
and step nine, stopping cooling when the temperature is cooled to 480 ℃ in the step eight, and tempering at 570 ℃ for 30 hours to obtain the high-wear-resistance graphite steel edge rolling roller.
And (3) detecting the hardness of the working layer of the product of the 3 embodiments, wherein the detection result shows that the hardness of the working layer of the high-wear-resistance graphite steel edge rolling roller is 53-55 HSD, and the working requirement is met.
The invention reasonably controls the content and the corresponding proportion of the graphitized element and the carbide forming element, so that the comprehensive performance is suitable for the requirements of the edge rolling roller of the section steel-rail beam universal rolling mill.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape, principle and the like of the invention are covered by the protection scope of the invention.
Alternative materials for the various components are listed in the description of the invention, but it will be understood by those skilled in the art that: the above list of component materials is not intended to be limiting and non exhaustive, and the various components may be replaced by other equivalent materials not mentioned in the present description, while still achieving the objects of the present invention. The specific embodiments mentioned in the description are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
In addition, the range of the amount of each component of the present invention includes any combination of any lower limit and any upper limit mentioned in the specification, and also includes any range where the specific content of the component in each specific example is made up as a combination of the upper limit or the lower limit: all such ranges are intended to be included within the scope of the present invention for brevity and clarity only and are not intended to be exhaustive or to limit the scope of the invention to the precise forms disclosed. Each feature of the invention described in this specification may be combined with any other feature of the invention which combination is not specifically disclosed in the specification for the sake of brevity.
Claims (10)
1. The high wear-resistant graphite steel edge rolling roller of the section steel-rail beam rolling mill and the manufacturing method thereof are characterized in that: the method comprises the following steps:
firstly, putting the selected raw materials into an electric arc furnace, smelting by adopting an oxidation method, and adjusting chemical components;
secondly, after the smelting in the first step is finished, carrying out ladle bottom inoculation before discharging;
thirdly, tapping after the inoculation of the second bottom is completed, and carrying out stream inoculation in the tapping process;
fourthly, adding a nodulizer in the tapping process in the third step, wherein the nodulizer rushes into a steel ladle along with the steel flow;
fifthly, blowing argon to the molten steel in the ladle for a period of time after tapping is finished;
sixthly, when the temperature of the molten steel reaches the pouring temperature in the step five, pouring, and simultaneously performing casting inoculation in the pouring process;
seventhly, performing spheroidizing annealing on the casting poured in the sixth step;
eighthly, machining the castings after the spheroidizing annealing is finished in the step seven, normalizing the castings, and then cooling the castings;
and step nine, stopping cooling when the temperature is cooled to a certain temperature in the step eight, and performing tempering treatment to obtain the high-wear-resistance graphite steel edge rolling roller.
2. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: in the first step, the raw material alloy components and the weight percentage of each alloy component are as follows: 1.80-2.50%, Si: 1.20-2.20%, Mn: 0.50-1.20 percent of P, less than or equal to 0.03 percent of P; s is less than or equal to 0.03%, Cr: 0.60 to 1.50%, Ni: 0.20 to 1.00%, Mo: 0.20-1.00%, and the balance of Fe and inevitable impurities.
3. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 2, characterized in that: secondly, inoculating agents used for inoculation in the third step and the sixth step are Fe-Si particles and Si-Ca particles, and 5-10Kg of inoculating agent is added into 1 ton of molten steel; wherein the grain size of the inoculant added along with the casting inoculation is 1-3 mm.
4. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: the nodulizer in the fourth step is a rare earth ferrosilicon magnesium nodulizer.
5. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: and fifthly, the sedation time is more than or equal to 10 min.
6. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: and sixthly, the pouring temperature is more than 50 ℃ of the melting point temperature of the molten steel.
7. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: the annealing temperature of the seventh step is 700-.
8. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: the normalizing temperature of the step eight is 950-.
9. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: step nine, stopping cooling after cooling to 450-600 ℃, wherein the tempering temperature is 550-600 ℃.
10. The high wear-resistant graphite steel edging roll for a section steel-rail beam rolling mill and the manufacturing method thereof according to claim 1, characterized in that: and in the step eight, the normalizing cooling adopts an air cooling mode and an air cooling mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363633.8A CN111101058A (en) | 2019-12-26 | 2019-12-26 | High-wear-resistance graphite steel edge rolling roller of section steel-rail beam rolling mill and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911363633.8A CN111101058A (en) | 2019-12-26 | 2019-12-26 | High-wear-resistance graphite steel edge rolling roller of section steel-rail beam rolling mill and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112813343A (en) * | 2020-12-28 | 2021-05-18 | 马鞍山庞博铸业有限公司 | Nodular cast steel and preparation method thereof |
| CN112853195A (en) * | 2020-12-28 | 2021-05-28 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN115044836A (en) * | 2022-08-15 | 2022-09-13 | 江苏凯达重工股份有限公司 | Improved graphite semisteel roller and preparation method thereof |
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| CN112813343A (en) * | 2020-12-28 | 2021-05-18 | 马鞍山庞博铸业有限公司 | Nodular cast steel and preparation method thereof |
| CN112853195A (en) * | 2020-12-28 | 2021-05-28 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN112853195B (en) * | 2020-12-28 | 2022-09-27 | 中钢集团邢台机械轧辊有限公司 | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll |
| CN115044836A (en) * | 2022-08-15 | 2022-09-13 | 江苏凯达重工股份有限公司 | Improved graphite semisteel roller and preparation method thereof |
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Application publication date: 20200505 |