CN112680657B - Method for manufacturing non-ferrous hot-rolled semi-high-speed steel working roll - Google Patents
Method for manufacturing non-ferrous hot-rolled semi-high-speed steel working roll Download PDFInfo
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Abstract
The invention discloses a method for manufacturing a non-ferrous hot-rolled semi-high-speed steel working roll, which belongs to the technical field of roll manufacturing, and the working roll comprises the following chemical components in percentage by mass: 0.50 to 0.8 percent of C, 0.30 to 0.80 percent of Si, 0.10 to 0.50 percent of Mn0.50 percent, 4.50 to 8.00 percent of Cr4, 0.50 to 2.00 percent of Mo0, less than or equal to 1.00 percent of V, less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities; the manufacturing method of the working roll comprises the steps of steel ingot smelting, billet forging, preliminary heat treatment, machining and final heat treatment, and finished product processing. The working roll has the advantages that the hardness of the surface layer of the roll body is 65-80HSD, and the working roll has excellent wear resistance, high roughness retention capacity and impact resistance. The product of the invention can prolong the machine period, improve the production efficiency and reduce the loss of the accident roller.
Description
Technical Field
The invention relates to the technical field of roller manufacturing, in particular to a manufacturing method of a non-ferrous hot-rolled semi-high-speed steel working roller.
Background
Rolls are the most important consumable parts as important tools in the color rolling industry. Hot rolling is a working part formed by rolling metal at high temperature. The roller bears great rolling stress in the working process, and the problems of inclusion, edge crack, tail flicking and the like of a rolled piece are added, so that the working condition is severe, instant high temperature is easily caused, the roller is subjected to strong thermal shock, and cracks, roller sticking, peeling and even scrapping are caused. The roller bears thousands of tons of pressure in the working process, and the surface of the roller often generates failure modes such as cracks, chipping, abrasion and the like, so that the surface of the roller is required to have quite high hardness, abrasion resistance and crack resistance. In summary, the roll is required to have not only resistance to cracking and peeling caused by bending stress, torsional stress and shear stress, but also high wear resistance, contact fatigue strength, fracture toughness, thermal shock strength and the like.
The materials for manufacturing the hot-rolled aluminum roller in the current domestic and foreign markets are mainly Cr3 and Cr5 series, and the high-speed development of the industries such as automobiles, household appliances, furniture and the like，The quality requirements on aluminum plates are continuously improved, and the quality requirements on rollers are higher and higher. When the chromium steel series roller is used for rolling a plate blank, because the shock resistance and the roughness retention capability are poor, the conditions of cracks and skidding are easy to occur on the machine, so that the rolling period is short, the roller is frequently changed, and the production efficiency is influenced. Because the accident resistance of the roller is low, the loss of the roller is large when a large roller winding accident occurs.
The conventional high-carbon chromium steel roller is limited by the material, so that the roller has high wear resistance and is difficult to have good accident resistance. With the continuous improvement of the requirements of the nonferrous hot rolling mill on the comprehensive properties of the roller, such as wear resistance, accident resistance and the like. In order to obtain higher comprehensive use performance and improve the alloying level of roller materials, the roller with higher alloying degree is made to become the development direction of the roller for the plate strip. Forging high-speed steel and semi-high-speed steel rollers becomes the latest development direction of roller materials. In recent years, forging high speed steel rolls has been widely used and has been commonly used in black strip cold and hot rolling mills.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for manufacturing a non-ferrous hot-rolled semi-high speed steel working roll, and the working roll manufactured by the method has high wear resistance, high roughness retention capacity and impact resistance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for manufacturing a colored hot-rolled semi-high-speed steel working roll comprises the following chemical components in percentage by mass: 0.50 to 0.8 percent of C, 0.30 to 0.80 percent of Si, 0.10 to 0.50 percent of Mn0.50 percent, 4.50 to 8.00 percent of Cr4, 0.50 to 2.00 percent of Mo0, less than or equal to 1.00 percent of V, less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further improved as follows: the manufacturing method of the working roller comprises the following steps:
step 1, steel ingot smelting: the raw materials are initially smelted in an electric arc furnace, molten steel is placed in a refining furnace for refining and vacuum degassing is carried out after smelting is finished, and after the molten steel is refined, casting is carried out, and a steel ingot is cast;
step 2, forging a steel billet: heating and forging the steel ingot prepared in the step 1 to prepare a roller blank;
step 3, preheating: heating the roller blank, preserving heat, then cooling in air, and finally tempering;
step 4, machining and final heat treatment: rough machining is carried out on the roller blank after the preliminary heat treatment, after the roller blank is qualified through ultrasonic flaw detection inspection, continuous induction quenching is carried out on the surface layer of the roller body, then tempering treatment is carried out on the roller blank, and the roller blank is cooled to room temperature after heat preservation;
step 5, processing a finished product working roller: after the tempering in the step 4 is finished, processing the roller blank subjected to the final heat treatment into a finished product working roller according to the required size; the hardness of the surface layer of the roll body of the finished product working roll is 65-80 HSD.
The technical scheme of the invention is further improved as follows: in the step 1, the refining temperature is 1600-1800 ℃, and vacuum degassing is carried out for 30-60 min under the vacuum degree of less than or equal to 100 Pa.
The technical scheme of the invention is further improved as follows: in step 3, the roller blank is heated to 930-1000 ℃ and is insulated, and the tempering temperature is 500-650 ℃.
The technical scheme of the invention is further improved as follows: in the step 4, the continuous induction quenching temperature of the surface layer of the roller body is 900-1000 ℃; the tempering temperature of the roller blank is 350-500 ℃, and the heat preservation time is 30-50 h.
The technical scheme of the invention is further improved as follows: in step 4, the tempering treatment is repeated twice.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. in the chemical components of the steel, cr element increases the hardenability of the steel and increases the hardness and the wear resistance of the steel; mo improves the hardenability of the steel, can reduce the temper brittleness when the content is 0.5 percent, has the secondary hardening effect, improves the heat strength and creep strength of the steel, and improves the organic acid and reducing medium corrosion resistance of the steel when the content is 2 to 3 percent.
2. The carbide Cr formed by the method has high content of carbide forming elements such as Cr, mo, V and the like 7 C 3 Endows the roller with excellent wear resistance and fine dispersion distribution of high-hardness carbide Mo 2 C. VC endows a roller matrix with high hardness and extremely high structure stability under high-temperature tempering, and ensures that the colored hot-rolled semi-high-speed steel working roller has excellent wear resistance, high roughness retention capability and accident resistance, thereby prolonging the rolling period of the roller in the rolling process and improving the accident resistance capability.
3. The surface layer of the working roll body of the working roll prepared by the invention has 65-80HSD hardness, and has excellent wear resistance, high roughness retention capacity and impact resistance; when the rolling mill is used on a hot-rolling aluminum rolling mill, the rolling period can be obviously prolonged, and the on-machine abrasion of the working roll is reduced; the method is applied to rolling mills with higher accident rate, can reduce the loss of the working rolls caused by accidents, and obviously improves the comprehensive use performance.
4. The refining method can effectively reduce impurities in steel and improve the quality of steel ingots; the heat treatment method ensures the performance of the working roll, the quenching and tempering temperature and time, and ensures that the working roll has the best mechanical performance and service performance.
5. The colored hot-rolled semi-high speed steel working roll manufactured by the method has excellent wear resistance, high roughness retention capacity and impact resistance, and the product performance completely meets the use requirement of a rolling line.
6. Compared with the conventional hot rolling working roll, the working roll produced by the method has the advantages that the wear resistance, the roughness retention capacity and the impact resistance are improved, the rolling period is prolonged, the production efficiency of a rolling line is increased, and the damage of accidents to the working roll can be effectively reduced.
Detailed Description
The invention relates to a method for manufacturing a colored hot-rolled semi-high-speed steel working roll, which is researched and developed aiming at the problem that the conventional high-carbon chromium steel roll is limited by the material, has higher wear resistance and is difficult to have good accident resistance.
The present invention will be described in further detail with reference to the following examples:
a method for manufacturing a colored hot-rolled semi-high-speed steel working roll comprises the following chemical components in percentage by mass: 0.50 to 0.8 percent of C, 0.30 to 0.80 percent of Si, 0.10 to 0.50 percent of Mn0.50 percent, 4.50 to 8.00 percent of Cr4, 0.50 to 2.00 percent of Mo0, less than or equal to 1.00 percent of V, less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
The manufacturing method of the working roller comprises the following steps:
step 1, steel ingot refining: the raw materials are initially smelted in an electric arc furnace, molten steel is placed in a refining furnace for refining and vacuum degassing is carried out after smelting is finished, and after the molten steel is refined, casting is carried out, and a steel ingot is cast; the refining temperature is 1600-1800 ℃, and vacuum degassing is carried out for 30-60 min under the vacuum degree of less than or equal to 100 Pa.
Step 2, forging a steel billet: and (3) heating and forging the steel ingot prepared in the step (1) to prepare a roller blank.
Step 3, preheating: heating the roller blank, preserving heat, then cooling in air, and finally tempering; heating the roller blank to 930-1000 deg.c and maintaining at 500-650 deg.c.
Step 4, machining and final heat treatment: rough machining is carried out on the roller blank after the preliminary heat treatment, after the roller blank is qualified through ultrasonic flaw detection inspection, continuous induction quenching is carried out on the surface layer of the roller body, then tempering treatment is carried out on the roller blank, and the roller blank is cooled to room temperature after heat preservation; the continuous induction quenching temperature of the surface layer of the roller body is 900-1000 ℃; tempering the roller blank at 350-500 ℃ for 30-50 h; the tempering treatment was repeated twice.
Step 5, processing a finished product working roller: after the tempering in the step 4 is finished, processing the roller blank subjected to final heat treatment to a finished product working roller according to the required size; the hardness of the surface layer of the roll body of the finished product working roll is 65-80 HSD.
Example 1
A method for manufacturing a colored hot-rolled semi-high-speed steel working roll comprises the following chemical components in percentage by mass: 0.50 to 0.60 percent of C, 0.30 to 0.50 percent of Si, 0.20 to 0.30 percent of Mn0.00 to 6.50 percent of Cr6.00 to 1.20 percent of Mo1, less than or equal to 0.50 percent of V, less than or equal to 0.50 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
The manufacturing method of the working roller comprises the following process steps:
step 1, steel ingot refining: the method comprises the following steps of firstly smelting required raw materials in an electric arc furnace, and then placing molten steel in a refining furnace for refining: the LF refining temperature is 1600-1800 ℃, and vacuum degassing is carried out after the LF refining temperature is maintained for 40min under the vacuum degree of 0-100 Pa. And after the molten steel is refined, pouring and die casting to form a steel ingot.
Carrying out chemical component analysis on the steel ingot to obtain the steel ingot with the following chemical components in percentage by mass: 0.56% of C, 0.41% of Si, 0.22% of Mn0, 6.30% of Cr6, 1.12% of Mo1, 0.21% of V, 0.24% of Ni0.02% of P, 0.004% of S, and the balance of Fe and inevitable impurities.
Step 2, forging a steel billet: and (2) heating the steel ingot obtained in the step (1), pressing a clamp handle, upsetting and drawing out to obtain a series of forging processes, and then preparing the steel ingot into a roller blank.
Step 3, preheating: carrying out preliminary heat treatment on the roller blank prepared in the step 2: heating to 950 ℃, preserving heat, then blowing for cooling, cooling to 300 ℃ and tempering at 610 ℃.
Step 4, machining and final heat treatment: and (3) mechanically rough machining the roller blank subjected to the preliminary heat treatment in the step (3) according to the required size, and after the roller blank is qualified through ultrasonic flaw detection inspection, continuously induction quenching the surface layer of the roller body of the roller blank by using a double-frequency induction quenching machine tool, wherein the quenching temperature is 920 ℃.
Tempering the roller blank after quenching: heating the roller blank to 400 ℃, preserving the heat for 30 hours, and then air-cooling to room temperature; the tempering treatment needs to be repeated twice.
Step 5, processing a finished product working roller: and after tempering is finished, performing finish machining on the roller blank according to delivery size requirements to obtain the final required working roller. And then carrying out ultrasonic detection, hardness test and metallographic structure inspection on the working roller.
And finally, the Shore hardness of the surface layer of the roller body of the roller is 67-71 HSD, and the ultrasonic detection and the metallographic structure meet the requirements.
Example 2
The process steps in example 2 are the same as those in example 1, except that in example 1: the design targets of the chemical components and the mass percentage of the chemical components of the working roll in the embodiment are as follows:
0.60 to 0.70 percent of C, 0.50 to 0.70 percent of Si, 0.10 to 0.30 percent of Mn0.50, 6.50 to 7.00 percent of Cr6.10 to 1.50 percent of Mo1.10, less than or equal to 1.00 percent of V, less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
After the chemical component analysis is carried out on the steel ingot smelted in the step 1, the chemical components and the mass percentage content thereof are as follows: 0.66% of C, 0.62% of Si, 0.26% of Mn0, 6.65% of Cr6, 1.32% of Mo, 0.82% of V, 0.31% of Ni, 0.014% of P, 0.003% of S, and the balance of Fe and inevitable impurities.
The quenching temperature in the step 3 is 980 ℃; the tempering temperature was 550 ℃.
The quenching temperature in the step 4 is 960 ℃; the tempering temperature is 350 ℃.
And 5, after the final production in the step 5 is finished, the Shore hardness of the surface layer of the roll body of the working roll is 74-78 HSD, and the ultrasonic detection and the metallographic structure meet the requirements.
Example 3
The process steps in example 3 are the same as those in example 1, except that: the design targets of the chemical components and the mass percentage of the chemical components of the working roll in the embodiment are as follows:
0.70 to 0.80 percent of C, 0.60 to 0.80 percent of Si, 0.30 to 0.50 percent of Mn0.50 percent, 4.50 to 6.00 percent of Cr4.5 to 0.7 percent of Mo0.5 percent, less than or equal to 0.30 percent of V, less than or equal to 0.50 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
After chemical component analysis is carried out on the steel ingot smelted in the step 1, the chemical components and the mass percentage content thereof are as follows: 0.76% of C, 0.78% of Si, 0.40% of Mn0, 5.53% of Cr5, 0.52% of Mo0, 0.18% of V, 0.32% of Ni0.01% of P, 0.008% of S and the balance of Fe and inevitable impurities.
The quenching temperature in the step 3 is 970 ℃; the tempering temperature is 500 ℃.
The quenching temperature in the step 4 is 950 ℃; the tempering temperature is 500 ℃.
And 5, after the final production is finished, the Shore hardness of the surface layer of the roller body of the roller is 65-68 HSD, and the ultrasonic detection and the metallographic structure meet the requirements.
Example 4
The process steps in example 4 are the same as those in example 1, except that in example 1: the design targets of the chemical components and the mass percentage of the working roll in the embodiment are as follows:
0.70 to 0.80 percent of C, 0.50 to 0.70 percent of Si, 0.10 to 0.30 percent of Mn0.00 to 8.00 percent of Cr7.00 to 8.00 percent of Mo1.50 to 2.00 percent of V less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
After the chemical component analysis is carried out on the steel ingot smelted in the step 1, the chemical components and the mass percentage content thereof are as follows: 0.73% of C, 0.64% of Si, 0.27% of Mn0, 7.55% of Cr7, 1.82% of Mo1, 0.62% of V, 0.30% of Ni0.013% of P, 0.003% of S and the balance of Fe and inevitable impurities.
The quenching temperature in the step 3 is 1000 ℃; the tempering temperature was 610 ℃.
The quenching temperature in the step 4 is 980 ℃; the tempering temperature was 560 ℃.
And 5, after the final production is finished in the step 5, the Shore hardness of the surface layer of the roller body of the roller is 76-80 HSD, and the ultrasonic detection and the metallographic structure meet the requirements.
In conclusion, compared with the conventional hot-rolled working roll, the non-ferrous hot-rolled semi-high speed steel working roll manufactured by the method has the advantages that the wear resistance, the roughness retention capacity and the impact resistance are improved, the rolling period is prolonged in the using process, the production efficiency of a rolling line is increased, and the damage of accidents to the roll can be effectively reduced; the product has excellent wear resistance, high roughness maintaining capacity and impact resistance, and the product performance can completely meet the use requirement of a rolling line.
Claims (2)
1. A method for manufacturing a non-ferrous hot-rolled semi-high speed steel working roll is characterized by comprising the following steps: the working roll comprises the following chemical components in percentage by mass: 0.70 to 0.80 percent of C, 0.50 to 0.70 percent of Si, 0.10 to 0.30 percent of Mn0.00 to 8.00 percent of Cr7.00 to 2.00 percent of Mo1.50 percent of V, less than or equal to 1.00 percent of Ni, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities; the manufacturing method of the working roller comprises the following steps:
step 1, steel ingot refining: the method comprises the following steps of (1) carrying out primary smelting on raw materials in an electric arc furnace, placing molten steel in a refining furnace for refining after the smelting is finished, carrying out vacuum degassing, and carrying out casting and die casting to form a steel ingot after the molten steel is refined; the refining temperature is 1600-1800 ℃, and vacuum degassing is carried out for 30-60 min under the vacuum degree of less than or equal to 100 Pa;
step 2, forging a steel billet: heating and forging the steel ingot prepared in the step 1 to prepare a roller blank;
step 3, preheating: heating the roller blank, preserving heat, then cooling in air, and finally tempering; heating the roller blank to 930-1000 ℃, and preserving the heat, wherein the tempering temperature is 500-650 ℃;
step 4, machining and final heat treatment: roughly processing the roller blank after the preliminary heat treatment, carrying out continuous induction quenching on the surface layer of the roller body after the roller blank is qualified through ultrasonic flaw detection, then carrying out tempering treatment on the roller blank, and carrying out heat preservation and air cooling to room temperature; the tempering treatment is repeated twice; tempering the roller blank at 350-500 ℃ for 30-50 h;
step 5, processing a finished product working roller: after the tempering in the step 4 is finished, processing the roller blank subjected to the final heat treatment into a finished product working roller according to the required size; the hardness of the surface layer of the roll body of the finished product working roll is 65-80 HSD.
2. The method for manufacturing the colored hot-rolled semi-high speed steel working roll according to claim 1, wherein the method comprises the following steps: in step 4, the continuous induction quenching temperature of the surface layer of the roller body is 900-1000 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103409696A (en) * | 2013-07-17 | 2013-11-27 | 中钢集团邢台机械轧辊有限公司 | Hot rolling roller for rolling nonferrous metal, and manufacturing method thereof |
| US20180257134A1 (en) * | 2016-05-27 | 2018-09-13 | Shandong Province Sifang Technical Development Co., Ltd | Composite casting special-shaped roll and preparation process therefore |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103409696A (en) * | 2013-07-17 | 2013-11-27 | 中钢集团邢台机械轧辊有限公司 | Hot rolling roller for rolling nonferrous metal, and manufacturing method thereof |
| US20180257134A1 (en) * | 2016-05-27 | 2018-09-13 | Shandong Province Sifang Technical Development Co., Ltd | Composite casting special-shaped roll and preparation process therefore |
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