CN108660361B - High-speed steel roll collar for hot-rolled seamless steel pipe and preparation method thereof - Google Patents
High-speed steel roll collar for hot-rolled seamless steel pipe and preparation method thereof Download PDFInfo
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Abstract
A high-speed steel roll collar for hot-rolled seamless steel tubes and a preparation method thereof belong to the technical field of steel tube manufacturing. Smelting high-speed molten steel in a medium-frequency induction furnace, and adjusting the chemical composition of the high-speed molten steel: 3.22-3.45% of C, 1.07-1.22% of W, 2.39-2.61% of Mo, 1.55-1.86% of V, 12.44-12.67% of Cr, 0.37-0.54% of Mn, 0.63-0.87% of Si, 0.29-0.41% of Al, < 0.035% of S, < 0.035% of P, and the balance of Fe, when the temperature of the molten steel reaches 1586-.
Description
Technical Field
The invention discloses a high-speed steel roll collar and a preparation method thereof, in particular relates to a high-speed steel roll collar for a hot-rolled seamless steel pipe and a preparation method thereof, and belongs to the technical field of steel pipe manufacturing.
Background
The seamless steel pipe plays an important role in industrial and agricultural production and construction. Seamless steel pipes are steel pipes made of a single piece of metal, without seams on the surface, and are called seamless steel pipes. According to the production method, the seamless steel pipe is divided into a hot rolled pipe, a cold drawn pipe, an extruded pipe, a pipe jacking and the like. The seamless steel pipe is divided into a round shape and a special shape according to the shape of a section, and the special-shaped pipe has various complex shapes such as a square shape, an oval shape, a triangular shape, a hexagonal shape, a melon seed shape, a star shape and a pipe with fins. Wherein the hot-rolled seamless steel pipe is a seamless steel pipe which is rolled at a temperature higher than the recrystallization temperature. The seamless steel pipe is made up by making steel ingot or solid pipe blank into tubular billet through perforation, then hot rolling, cold rolling or cold drawing.
The hot-rolled seamless steel pipe has an important position in the steel pipe industry of China, the raw material of the hot-rolled seamless steel pipe is a round pipe blank, the round pipe blank is cut by a cutting machine to be processed into a blank with the length of about 1 meter, and the blank is conveyed into a smelting furnace through a conveyor belt to be heated. The steel slab is fed into a furnace and heated to a temperature of about 1200 degrees celsius. And (4) emptying the round pipe blank after the round pipe blank is discharged from the furnace through a pressure perforating machine. The common puncher is a conical roller puncher, which has high production efficiency, good product quality and large punching and expanding amount and can be used for punching various steel types. After perforation, the round tube blank is sequentially subjected to three-roller skew rolling, continuous rolling and extrusion, and the tube is removed and sized after extrusion. The sizing mill rotates into the steel billet at a high speed through the conical drill to punch holes to form the steel pipe. The inside diameter of the steel tube is determined by the length of the outside diameter of the sizer drill. After sizing, the steel pipe enters a cooling tower and is cooled by spraying water, and after cooling, the steel pipe is straightened. The steel pipe is sent to a metal flaw detector (or a hydraulic pressure experiment) for internal flaw detection after being straightened. The three-roll skew rolling is a key process for hot rolling seamless steel pipes, and the roll rings are main consumed spare parts in the three-roll skew rolling process.
The method comprises the steps of ① installing a die, ② hanging 15-25mm high temperature resistant molding sand in a pass of the die, compacting molding sand, scraping a roll pass circular arc, drying in a furnace, ③ configuring chemical components for molten iron, obtaining a roll blank after pouring, roughly machining the roll blank, performing high temperature heat treatment, ⑤ drawing and impact testing on a horizontal slice of a neck end portion of a blank roll after heat treatment, verifying tensile strength and section rolling toughness of the roll, ⑥, performing flaw detection on a full roll in the axial direction, detecting metallographic procedures, and finally performing forging, wear resistance, and finish machining on the cast lower roll of the invention, and the like, and the invention also comprises the following steps of a rolling mill, a hot.
However, various collars developed at present generally have disadvantages of low hardness, poor wear resistance, and easy adhesion of the collars to seamless steel pipes during hot rolling, which seriously affects the appearance quality of the seamless steel pipes.
Disclosure of Invention
The roll collar for hot rolling the seamless steel pipe is manufactured by using the high-speed steel material, and in order to prevent the seamless steel pipe from being adhered to the surface of the roll collar, the dispersed fine graphite is precipitated in situ in the roll collar, so that the friction coefficient between the roll collar and the seamless steel pipe is reduced. The invention can be realized by the following process steps.
The preparation method of the high-speed steel roll collar for the hot-rolled seamless steel tube is characterized by comprising the following steps of:
① melting high-speed molten steel in a medium-frequency induction furnace, controlling the chemical composition and mass fraction of the high-speed molten steel to 3.22-3.45% of C, 1.07-1.22% of W, 2.39-2.61% of Mo, 1.55-1.86% of V, 12.44-12.67% of Cr, 0.37-0.54% of Mn, 0.63-0.87% of Si, 0.29-0.41% of Al, < 0.035% of S, < 0.035% of P, and the balance Fe, when the temperature of the molten steel reaches 1586 ℃ and 1609 ℃, discharging the molten steel to the steel ladle, adding multi-component alloy particles into the steel in advance, wherein the size of the multi-component alloy particles is 4-6mm, the chemical composition and mass fraction of the multi-component alloy particles are 6.04-7.71% of Ce, 6.15-7.48% of La, 10.10-11.29% of Bi, 5.02-5.31% of Mg, 3.54-4.84% of Sb, the balance of the mass fraction of the steel particles is 1.59-1.25%, and the balance Fe is unavoidable;
② step ①, after slagging off and standing the molten steel in the steel ladle, when the temperature is reduced to 1452-1475 ℃, pouring the molten steel into a casting mold, and in the process of pouring the molten steel, pouring high-silicon-calcium-barium-zinc alloy particles along with the molten steel flow, wherein the size of the high-silicon-calcium-barium-zinc alloy particles is 1-3mm, and the chemical composition and the mass fraction of the high-silicon-calcium-barium-zinc alloy particles are 60.14-63.78% of Si, 5.07-5.53% of Ca, 5.52-5.80% of Ba, 11.74-12.11% of Zn, less than or equal to 0.50% of C, less than or equal to 0.04% of P, less than or equal to 0.06% of S, the balance being Fe, and the adding amount of the high-silicon-calcium-barium-zinc alloy particles accounts for 2.63-2.88% of the mass fraction of;
③ molten steel is poured for 1-2 hours, the casting is taken out after opening the box, after sanding and cleaning, a high-speed steel roll ring blank is obtained, after rough machining of the high-speed steel roll ring blank, a high-temperature anti-oxidation coating is coated on the surface of the high-speed steel roll ring blank, the thickness of the coating is 0.50-0.80mm, then the high-speed steel roll ring blank coated with the coating is heated to 1120-plus-temperature 1135 ℃ along with the furnace, after heat preservation for 2-2.5 hours, the furnace is cooled to 1020-1035 ℃, after heat preservation for 90-100 minutes, the high-speed steel roll ring is quenched and cooled for 20-25 minutes in quenching oil at the temperature of 60-85 ℃, then the high-speed steel roll ring is heated to 580-plus-temperature 595 ℃ along with the furnace at the furnace temperature of 300-plus-temperature, the heating speed is 8 ℃/20 minutes, after heat preservation for 5-6 hours, then the furnace is cooled to the temperature of less than 200 ℃, the roll ring is heated to 530-545 ℃ along with the furnace at the speed of 30 ℃/30 minutes, after heat preservation for 8-10 hours, the furnace is cooled to.
The high-speed steel roll collar for the hot-rolled seamless steel tube adopts the medium-frequency induction furnace to smelt molten steel, and has simple and convenient process and high production efficiency. The chemical composition and the mass fraction of the high-speed steel molten steel are controlled to be 3.22 to 3.45 percent of C,1.07 to 1.22 percent of W,2.39 to 2.61 percent of Mo,1.55 to 1.86 percent of V,12.44 to 12.67 percent of Cr,0.37 to 0.54 percent of Mn,0.63 to 0.87 percent of Si,0.29 to 0.41 percent of Al,<0.035％S,<0.035% P, and the balance Fe. Wherein, 1.07-1.22 percent of W and 2.39-2.61 percent of Mo are added, and part of tungsten and molybdenum are melted into the matrix in the high-temperature heat treatment process, so that the high-temperature hardness of the matrix can be improved, and the high-temperature wear resistance of the roll collar can be improved. The V of 1.55-1.86 percent is added, mainly because vanadium is a strong carbide forming element, VC with high hardness is easily generated in the solidification process, and the wear resistance of the roll collar is favorably improved. Adding 12.44-12.67% Cr, mainly utilizing that chromium is solid-dissolved in matrix at high temperature, and in the course of tempering it is favourable for dispersing and separating out Cr23C6The hardness of the matrix is improved, and the wear resistance of the roll collar is improved. In addition, chromium tends to form dense Cr at high temperatures2O3The protective film can reduce the friction force with the surface of the steel pipe in the rolling process of the roll collar, thereby reducing the power consumption in the steel pipe rolling process. Adding Mn 0.37-0.54% and Si 0.63-0.87% can pre-deoxidize molten steel. 0.29 to 0.41 percent of Al is added, except the final deoxidation effect of molten steel, the Al is a non-carbide forming element and is dissolved in a matrix, thus promoting pearlite and ferrite to easily appear in an as-cast structure, improving the processing performance of the as-cast high-speed steel roll collar, directly performing rough processing without annealing, reducing energy consumption and shortening the production period of the high-speed steel roll collar. In addition, dense Al is easily generated by adding aluminum2O3And the protective film can prevent continuous oxidation of the high-speed steel roll collar in the using process.
In addition, when the temperature of the molten steel reaches 1586-1609 ℃, the molten steel is discharged to a steel ladle, the steel ladle is pre-added with multi-element alloy particles, the size of the multi-element alloy particles is 4-6mm, the chemical composition and the mass fraction of the multi-element alloy particles are 6.04-7.71% of Ce, 6.15-7.48% of La, 10.10-11.29% of Bi, 5.02-5.31% of Sb, 3.54-4.25% of Mg, 22.07-26.59% of Si, and the balance of Fe and inevitable trace impurities, and the addition amount of the multi-element alloy particles accounts for 1.26-1.45% of the mass fraction of the molten steel entering the steel ladle. The multi-element alloy particles are added mainly for the purposes of desulfurizing and deoxidizing and refining a solidification structure by using 6.04-7.71% of Ce and 6.15-7.48% of La in the multi-element alloy particles, and the multi-element alloy particles contain 3.54-4.25% of Mg, so that the multi-element alloy particles have the effects of promoting the fracture of eutectic carbides and realizing the isolated growth of the eutectic carbides, and are favorable for improving the strength and toughness of the high-speed steel roll collar. The multielement alloy particles contain 10.10-11.29% of Bi and 5.02-5.31% of Sb, and the Sb, Bi and rare earth elements coexist in a proper proportion to eliminate the modified graphite, so that the graphite morphology can be effectively improved, the number of graphite spheres can be increased, and the modified graphite in the center of the roll collar can be reduced or eliminated. After slagging off and standing the molten steel, when the temperature is reduced to 1452-1475 ℃, pouring the molten steel into a casting mold, and pouring high silicon calcium barium zinc alloy particles along with molten steel flow in the molten steel pouring process, wherein the size of the high silicon calcium barium zinc alloy particles is 1-3mm, and the chemical composition and the mass fraction of the high silicon calcium barium zinc alloy particles are as follows: 60.14-63.78% of Si, 5.07-5.53% of Ca, 5.52-5.80% of Ba, 11.74-12.11% of Zn, less than or equal to 0.50% of C, less than or equal to 0.04% of P, less than or equal to 0.06% of S and the balance of Fe, wherein the addition amount of the high silicon calcium barium zinc alloy particles accounts for 2.63-2.88% of the mass fraction of molten steel entering the casting mold. The main function of adding the high silicon calcium barium zinc alloy particles is to promote the precipitation of fine graphite in the process of roller ring solidification. In addition, eutectic carbide can be further refined by adding the high-silicon-calcium-barium-zinc alloy particles, and the toughness of the roll collar can be further improved. After molten steel is poured for 1-2 hours, a casting is taken out after opening a box, a high-speed steel roll ring blank is obtained after polishing and sand removal, after the high-speed steel roll ring blank is directly roughly machined, common high-temperature anti-oxidation coating is coated on the surface of the high-speed steel roll ring blank, the thickness of the coating is 0.50-0.80mm, and serious oxidation and decarburization can be prevented when the roll ring is heated at high temperature and kept warm. And then heating the high-speed steel roller ring blank coated with the coating to 1120-1135 ℃ along with the furnace, and after the temperature is kept for 2-2.5 hours, mainly promoting further precipitation of graphite. Furnace cooling is needed after heat preservation, because the direct quenching is carried out at the temperature of 1120-1135 ℃, the alloy elements which are solid-dissolved in austenite at high temperature are too much, a large amount of retained austenite appears in a quenching structure, and the hardness and the wear resistance of the roll collar are greatly reduced. After the high-temperature heat preservation treatment, the furnace is cooled to the temperature of 1020-1035 ℃, the heat preservation is carried out for 90-100 minutes, and then the quenching and cooling are carried out for 20-25 minutes in the quenching oil with the temperature of 60-85 ℃, mainly in order to obtain the martensite matrix with high hardness. And then heating the high-speed steel roll collar to 580-595 ℃ along with the furnace in the furnace at the temperature of 300-380 ℃ at the heating speed of 8 ℃/20 minutes, and preserving heat for 5-6 hours, wherein the decomposition of the residual austenite is mainly promoted, and the performance of the roll collar is stable. And then cooling the furnace to the temperature of lower than 200 ℃, continuously heating the roll collar to 530-545 ℃ along with the furnace at the speed of 30 ℃/30 minutes, keeping the temperature for 8-10 hours, cooling the furnace to the temperature of lower than 120 ℃, discharging the roll collar from the furnace, and air-cooling the roll collar to the room temperature, mainly aiming at eliminating the internal stress of the roll collar, stabilizing the structure of the roll collar and ensuring the safe use of the roll collar. And finally, finishing to a specified size and precision to obtain the high-speed steel roll collar for the hot-rolled seamless steel tube.
Compared with the prior art, the invention has the following advantages.
1) The high-speed steel roll collar does not contain expensive alloy elements such as niobium, cobalt, nickel and the like, and has lower production cost;
2) in the process of pouring molten steel, high-silicon-calcium-barium-zinc alloy particles are poured into the high-speed steel roll collar along with the molten steel flow, so that graphite is precipitated from the cast structure of the roll collar, the precipitation amount of the graphite is further increased in the process of high-temperature heat treatment, the volume percentage of the graphite in a microstructure reaches 6.3-6.7%, and the phenomenon of steel sticking is avoided when the high-speed steel roll collar is used for rolling a seamless steel pipe;
3) the high-speed steel roll collar has the hardness of more than 82HSD, the impact toughness of more than 25J/cm2 and the tensile strength of more than 1550MPa, has excellent use effect, is used on a hot-rolled seamless steel tube rolling mill, has the service life of more than 5 times longer than that of a high-nickel-chromium infinite chilled cast iron roll collar, improves the production cost by about 30 percent, and has good economic and social benefits when being popularized and applied.
Drawings
FIG. 1 is a picture of graphite precipitation in a high-speed steel roll ring obtained in design example 1 of the present invention.
Detailed Description
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples. The high temperature oxidation-resistant coating is conventional oxidation-resistant coating, such as 202 high temperature oxidation-resistant coating produced by Zhejiang yellow rock special coating plant (Zhejiang yellow rock special coating new material Co., Ltd.), RLHY-33 type steel heating oxidation-resistant coating produced by Beijing Rongli constant technology Co., Ltd.
Example 1:
the high-speed steel roll collar for the hot-rolled seamless steel pipe and the preparation method thereof are characterized in that the high-speed steel roll collar is smelted by adopting a 500 kg medium-frequency induction furnace, and the specific preparation process comprises the following steps:
① smelting high-speed molten steel in a medium-frequency induction furnace, and controlling the chemical composition and mass fraction of the high-speed molten steel to 3.22% of C, 1.22% of W, 2.39% of Mo, 1.86% of V, 12.44% of Cr, 0.37% of Mn, 0.87% of Si, 0.29% of Al, 0.032% of S, 0.034% of P, and the balance of Fe, when the temperature of the molten steel reaches 1586 ℃, discharging the molten steel to a ladle, and adding multi-component alloy particles in advance into the ladle, wherein the size of the multi-component alloy particles is 4-6mm, the chemical composition and mass fraction of the multi-component alloy particles are 6.04% of Ce, 7.48% of La, 10.10% of Bi, 5.31% of Sb, 3.54% of Mg, 26.59% of Si, and the balance of Fe and inevitable trace impurities, and the addition amount of the multi-component alloy particles accounts for 1.26% of the mass fraction of the molten steel entering the;
②, after slagging off and standing the molten steel in the steel ladle in the step ①, when the temperature is reduced to 1452 ℃, pouring the molten steel into a casting mold, and pouring high silicon calcium barium zinc alloy particles along with the molten steel flow in the molten steel pouring process, wherein the high silicon calcium barium zinc alloy particles have the size of 1-3mm, and the chemical composition and the mass fraction of the high silicon calcium barium zinc alloy particles are 60.14% of Si, 5.53% of Ca, 5.52% of Ba, 12.11% of Zn, 0.39% of C, 0.033% of P, 0.047% of S, and the balance of Fe, and the addition amount of the high silicon calcium barium zinc alloy particles accounts for 2.63% of the mass fraction of the molten steel entering the casting mold;
③ molten steel is poured for 1 hour, the casting is taken out after opening the box, after sanding and cleaning, a high-speed steel roll ring blank is obtained, after rough machining of the high-speed steel roll ring blank, a high-temperature anti-oxidation coating is coated on the surface of the high-speed steel roll ring blank, the high-speed steel roll ring blank coated with the coating is heated to 1120 ℃ along with the furnace, after heat preservation for 2.5 hours, the furnace is cooled to 1020 ℃, after heat preservation for 100 minutes, the high-speed steel roll ring is quenched and cooled for 25 minutes in quenching oil at the temperature of 60 ℃, then the high-speed steel roll ring is heated to 595 ℃ along with the furnace at the furnace temperature of 300 ℃ and 330 ℃, the heating speed is 8 ℃/20 minutes, heat preservation is carried out for 6 hours, then the furnace is cooled to below 200 ℃, the roll ring is continuously heated to 545 ℃ along with the furnace at the speed of 30 ℃/30 minutes, after heat preservation for 8 hours, the furnace is cooled to the temperature of below 120 ℃, taken out of the furnace to the air cooling room temperature, finally, the high-speed steel roll.
Example 2:
the high-speed steel roll collar for the hot-rolled seamless steel pipe and the preparation method thereof are characterized in that 1000 kg of medium-frequency induction furnace smelting is adopted, and the specific preparation process comprises the following steps:
① smelting high-speed molten steel in a medium-frequency induction furnace, and controlling the chemical composition and mass fraction of the high-speed molten steel to 3.45% of C, 1.07% of W, 2.61% of Mo, 1.55% of V, 12.67% of Cr, 0.54% of Mn, 0.63% of Si, 0.41% of Al, 0.028% of S, 0.033% of P and the balance of Fe, when the temperature of the molten steel reaches 1609 ℃, discharging the molten steel to a ladle, adding multi-element alloy particles into the ladle in advance, wherein the size of the multi-element alloy particles is 4-6mm, the chemical composition and mass fraction of the multi-element alloy particles is 7.71% of Ce, 6.15% of La, 11.29% of Bi, 5.02% of Sb, 4.25% of Mg, 22.07% of Si and the balance of Fe and inevitable trace impurities, and the addition amount of the multi-element alloy particles accounts for 1.45% of the mass fraction of the molten steel entering the ladle;
②, after slagging off and standing the molten steel in ① steel ladle, when the temperature is reduced to 1475 ℃, pouring the molten steel into a casting mold, and pouring high silicon calcium barium zinc alloy particles along with the molten steel flow in the molten steel pouring process, wherein the high silicon calcium barium zinc alloy particles have the size of 1-3mm, and the chemical composition and the mass fraction of the high silicon calcium barium zinc alloy particles are 63.78% of Si, 5.07% of Ca, 5.80% of Ba, 11.74% of Zn, 0.45% of C, 0.037% of P, 0.041% of S and the balance of Fe, and the addition amount of the high silicon calcium barium zinc alloy particles accounts for 2.88% of the mass fraction of the molten steel entering the casting mold;
③ molten steel is poured for 2 hours, the casting is taken out after opening the box, after sanding and cleaning, a high-speed steel roll ring blank is obtained, after rough machining of the high-speed steel roll ring blank, high-temperature anti-oxidation coating is coated on the surface of the high-speed steel roll ring blank, the high-speed steel roll ring blank coated with the coating is heated to 1135 ℃ along with the furnace, after 2 hours of heat preservation, the furnace is cooled to 1035 ℃, after 90 minutes of heat preservation, the high-speed steel roll ring is quenched and cooled for 20 minutes in quenching oil at 85 ℃, then the high-speed steel roll ring is heated to 580 ℃ along with the furnace at 380 ℃ along with the furnace at the furnace temperature of 350 ℃ and the furnace temperature, the heating speed is 8 ℃/20 minutes, the heat preservation is carried out for 5 hours, then the furnace is cooled to below 200 ℃, the roll ring is continuously heated to 530 ℃ along with the furnace at the speed of 30 ℃/30 minutes, after 10 hours of heat preservation, the furnace is cooled to the temperature of below 120 ℃, the furnace is taken out to the air cooling room temperature, finally.
Example 3:
the high-speed steel roll collar for the hot-rolled seamless steel pipe and the preparation method thereof are characterized in that 1500 kg of medium-frequency induction electric furnace smelting is adopted, and the specific preparation process steps are as follows:
① smelting high speed molten steel in a medium frequency induction furnace, controlling the chemical composition and mass fraction of the high speed molten steel at 3.37% C, 1.17% W, 2.48% Mo, 1.69% V, 12.50% Cr, 0.46% Mn, 0.69% Si, 0.35% Al, 0.031% S, 0.025% P, and the balance Fe, when the temperature of the molten steel reaches 1597 ℃, discharging the molten steel to a ladle, adding multi-component alloy particles into the ladle in advance, wherein the size of the multi-component alloy particles is 4-6mm, the chemical composition and mass fraction of the multi-component alloy particles are 6.93% Ce, 6.84% La, 10.79% Bi, 5.08% Sb, 3.74% Mg, 24.06% Si, and the balance Fe and inevitable trace impurities, and the addition amount of the multi-component alloy particles accounts for 1.30% of the mass fraction of the molten steel entering the ladle;
②, after slagging off and standing the molten steel in ① steel ladle, when the temperature is reduced to 1461 ℃, pouring the molten steel into a casting mold, and pouring high silicon calcium barium zinc alloy particles along with the molten steel flow in the molten steel pouring process, wherein the size of the high silicon calcium barium zinc alloy particles is 1-3mm, the chemical composition and the mass fraction of the high silicon calcium barium zinc alloy particles are 62.53% of Si, 5.36% of Ca, 5.72% of Ba, 11.95% of Zn, 0.27% of C, 0.029% of P, 0.051% of S and the balance of Fe, and the adding amount of the high silicon calcium barium zinc alloy particles accounts for 2.70% of the mass fraction of the molten steel entering the casting mold;
③ molten steel is poured for 1.5 hours, the casting is taken out after opening the box, after sanding and cleaning, a high-speed steel roll collar blank is obtained, after rough machining of the high-speed steel roll collar blank, a high-temperature anti-oxidation coating is coated on the surface of the high-speed steel roll collar blank, the high-speed steel roll collar blank coated with the coating is heated to 1130 ℃ along with the furnace, after heat preservation for 2.5 hours, the furnace is cooled to 1030 ℃, after heat preservation for 90 minutes, the high-speed steel roll collar is quenched and cooled in quenching oil at 74 ℃ for 23 minutes, then the high-speed steel roll collar is heated to 585 ℃ along with the furnace at the furnace temperature of 365 ℃, the heating speed is 8 ℃/20 minutes, the heat preservation is carried out for 6 hours, then the furnace is cooled to below 200 ℃, the roll collar is continuously heated to 540 ℃ along with the furnace at the speed of 30 ℃/30 minutes, after heat preservation for 9 hours, the furnace is cooled to the temperature of below 120 ℃, the roll collar is taken out of the furnace and air cooled to the room temperature, finally, the high-speed steel.
TABLE 1 high-speed Steel roll Ring mechanical Properties for Hot-rolled seamless Steel tube
| Mechanical properties | hardness/HSD | Impact toughness/J.cm-2 | Tensile strength/MPa |
| Example 1 | 82.7 | 26.1 | 1570 |
| Example 2 | 82.4 | 25.8 | 1625 |
| Example 3 | 83.2 | 26.9 | 1610 |
The picture of the graphite precipitated in the high-speed steel roll ring obtained in the design example 1 of the invention is shown in figure 1, and the picture of the graphite precipitated in figure 1 is also obtained in examples 2 and 3.
The high-speed steel roll collar does not contain expensive alloy elements such as niobium, cobalt, nickel and the like, and has lower production cost. In the process of pouring molten steel, the high-silicon-calcium-barium-zinc alloy particles are poured into the high-speed steel roll collar along with the molten steel flow, so that graphite is precipitated from an as-cast structure, the precipitation amount of the graphite is further increased in the process of high-temperature heat treatment, the volume percentage of the graphite in a microstructure reaches 6.3-6.7%, and the phenomenon of steel sticking is avoided when the high-speed steel roll collar is used for rolling a seamless steel pipe. The hardness of the high-speed steel roll ring is more than 82HSD, and the impact toughness is more than 25J/cm2The high-speed steel roll collar has the advantages that the tensile strength is greater than 1550MPa, the use effect is excellent, the service life of the high-speed steel roll collar is prolonged by more than 5 times compared with that of a high-nickel-chromium infinite chilled cast iron roll collar when the high-speed steel roll collar is used on a hot-rolled seamless steel tube rolling mill, the production cost is only improved by about 30%, the high-speed steel roll collar can be popularized and applied, the operation rate of a tube rolling mill can be improved, the labor intensity of workers is reduced, the surface quality of a steel tube is improved, the production cost of the steel tube is.
Claims (2)
1. The preparation method of the high-speed steel roll collar for the hot-rolled seamless steel tube is characterized by comprising the following steps of:
① melting high-speed molten steel in a medium-frequency induction furnace, controlling the chemical composition and mass fraction of the high-speed molten steel to 3.22-3.45% of C, 1.07-1.22% of W, 2.39-2.61% of Mo, 1.55-1.86% of V, 12.44-12.67% of Cr, 0.37-0.54% of Mn, 0.63-0.87% of Si, 0.29-0.41% of Al, < 0.035% of S, < 0.035% of P, and the balance Fe, when the temperature of the molten steel reaches 1586 ℃ and 1609 ℃, discharging the molten steel to the steel ladle, adding multi-component alloy particles into the steel in advance, wherein the size of the multi-component alloy particles is 4-6mm, the chemical composition and mass fraction of the multi-component alloy particles are 6.04-7.71% of Ce, 6.15-7.48% of La, 10.10-11.29% of Bi, 5.02-5.31% of Mg, 3.54-4.84% of Sb, the balance of the mass fraction of the steel particles is 1.59-1.25%, and the balance Fe is unavoidable;
② step ①, after slagging off and standing the molten steel in the steel ladle, when the temperature is reduced to 1452-1475 ℃, pouring the molten steel into a casting mold, and in the process of pouring the molten steel, pouring high-silicon-calcium-barium-zinc alloy particles along with the molten steel flow, wherein the size of the high-silicon-calcium-barium-zinc alloy particles is 1-3mm, and the chemical composition and the mass fraction of the high-silicon-calcium-barium-zinc alloy particles are 60.14-63.78% of Si, 5.07-5.53% of Ca, 5.52-5.80% of Ba, 11.74-12.11% of Zn, less than or equal to 0.50% of C, less than or equal to 0.04% of P, less than or equal to 0.06% of S, the balance being Fe, and the adding amount of the high-silicon-calcium-barium-zinc alloy particles accounts for 2.63-2.88% of the mass fraction of;
③ molten steel is poured for 1-2 hours, the box is opened, a casting is taken out, after sanding and cleaning, a high-speed steel roll ring blank is obtained, after rough machining, the surface of the high-speed steel roll ring blank is coated with a high-temperature anti-oxidation coating with the thickness of 0.50-0.80mm, then the high-speed steel roll ring blank coated with the coating is heated to 1120-plus-temperature 1135 ℃ along with the furnace, after heat preservation for 2-2.5 hours, the furnace is cooled to 1020-1035 ℃, after heat preservation for 90-100 minutes, the high-speed steel roll ring is quenched and cooled for 20-25 minutes in quenching oil with the temperature of 60-85 ℃, then the high-speed steel roll ring is heated to 580-plus-595 ℃ along with the furnace at the furnace temperature of 300-plus-temperature, the heating speed is 8 ℃/20 minutes, after heat preservation for 5-6 hours, then the furnace is cooled to 200 ℃ along with the furnace, the roll ring is continuously heated to 530-plus-temperature along with the furnace at the speed of 30 ℃ along with the furnace, after heat preservation for 8-10 hours, the furnace is cooled to the temperature of below 120 ℃, the furnace is taken out to.
2. A high speed steel roll collar for hot rolled seamless steel pipe produced according to the method of claim 1.
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Denomination of invention: High speed steel roll ring for hot rolled seamless steel pipe and its preparation method Effective date of registration: 20221124 Granted publication date: 20200515 Pledgee: Tongling Wanjiang Rural Commercial Bank Co.,Ltd. Jinghu Sub branch Pledgor: ANHUI HUANBOWAN HIGH SPEED STEEL MILL ROLL Co.,Ltd. Registration number: Y2022980023428 |
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