CN111455270B - High-frequency induction welding steel pipe raw material steel with high wear resistance, and preparation method and application thereof - Google Patents
High-frequency induction welding steel pipe raw material steel with high wear resistance, and preparation method and application thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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Abstract
The invention provides a high-frequency induction welding steel pipe raw material steel with high wear resistance and a preparation method thereof, wherein the high-frequency induction welding steel pipe raw material steel comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 0 to 0.05 percent of Si, 0.5 to 1.3 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 to 0.04 percent of Al, 0.03 to 0.08 percent of Nb, 0.03 to 0.10 percent of V, and the balance of Fe and inevitable impurities. The high-frequency induction welded steel pipe raw material steel has the advantages of easiness in forming, easiness in welding, high work hardening degree and the like; in addition, the wear resistance of the welded steel pipe and the carrier roller prepared from the high-frequency induction welded steel pipe raw material steel in service is further improved.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to high-frequency induction welding steel pipe raw material steel with high wear resistance, and a preparation method and application thereof.
Background
With the continuous maturity of the pipe-making technology of high-frequency induction welded steel pipe, the application of high-frequency induction welded steel pipe is continuously expanded, and the high-frequency induction welded steel pipe is widely applied in the fields of automobiles, coal, engineering machinery, petrochemical industry, steel structures and the like. In terms of the use of high-frequency induction welded steel pipes, in addition to their use as static structural components, they can also be used as dynamic bearings, for example as automotive driveshaft tubes, mechanical expanding axle housing, belt conveyor idler rollers, etc. Among them, the high frequency induction welded steel pipe used as some dynamic bearing members must have some special properties such as wear resistance, corrosion resistance, acid resistance, low temperature toughness, etc. depending on the environment and service mode used, in addition to excellent strong plastic matching.
In addition, the carrier roller is a very important component of the belt conveyor, which accounts for about 30% of the total cost of the belt conveyor, bears more than 70% of resistance, has a high incidence of wear failure, and becomes a main object of daily maintenance. Once the bearing roller became invalid, not only can influence the engineering progress, can accelerate the wearing and tearing of conveyer belt moreover greatly, cause great wasting of resources and economic loss. At present, roller materials used at home and abroad are Q235 seamless steel tubes mostly, and the roller materials have good bending resistance, but have poor wear resistance and short service life. At home and abroad, non-metal carrier rollers are researched and developed aiming at the problem, wherein the non-metal carrier rollers comprise ceramic carrier rollers, rubber carrier rollers, polymer carrier rollers and the like, and have the advantages of wear resistance, corrosion resistance, oxidation resistance and the like, but the product has the defects of complex forming process, poor toughness, high price and the like, so the application range is limited. A great deal of research departments on how to improve the wear resistance of the carrier roller are carried out at home and abroad, wherein more research is mainly embodied on the structural design, for example, the wear resistance is improved by adding a rubber ring outside the roller, and a control method for improving the wear resistance by optimizing and improving the material of the carrier roller product is not available.
For the improvement of the wear resistance, a great deal of research at home and abroad focuses on controlling the tissue type of the material by means of heat treatment to obtain structures such as martensite, bainite and the like, so that the wear resistance is greatly improved and is far higher than that of ferrite and pearlite steel. For the raw material steel of the high-frequency induction welded steel pipe, martensite and bainite structures cannot meet the requirements of the pipe making industry, and on one hand, the pipe making cannot be carried out due to the high strength and hardness of the martensite and bainite structures; on the other hand, the quality inspection after pipe making is carried out by using a flattening experiment, but the problem of cracking is easy to occur due to poor plasticity of martensite and bainite. The reasons for the two aspects are remarkable for the application of bainite and martensite steel in the carrier roller industry. Therefore, the roller manufacturers generally select the raw materials to be mainly plain carbon steel or microalloyed steel, and the structure type is mainly a mixed structure of ferrite and pearlite.
Disclosure of Invention
In view of the above problems, the present invention provides a high-frequency induction welded steel pipe raw material steel having high wear resistance, a method for producing the same, and applications thereof. The high-frequency induction welded steel pipe raw material steel has the characteristics of easiness in forming, easiness in welding and high work hardening degree; in addition, the wear resistance of the welded steel pipe and the carrier roller prepared from the high-frequency induction welded steel pipe raw material steel in service is further improved.
The technical scheme for realizing the purpose is as follows:
the invention provides high-frequency induction welding steel pipe raw material steel with high wear resistance, which comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 0 to 0.05 percent of Si, 0.5 to 1.3 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 to 0.04 percent of Al, 0.03 to 0.08 percent of Nb, 0.03 to 0.10 percent of V, and the balance of Fe and inevitable impurities.
In one embodiment, in the high-frequency induction welded steel pipe raw material steel having high wear resistance according to the present invention, the high-frequency induction welded steel pipe raw material steel comprises, by mass: 0.16 to 0.19 percent of C, 0 to 0.05 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 to 0.04 percent of Al, 0.04 to 0.08 percent of Nb, 0.04 to 0.10 percent of V, and the balance of Fe and inevitable impurities;
preferably, the high-frequency induction welded steel pipe raw material steel comprises, by mass: 0.18 percent of C, 0.02 percent of Si, 0.85 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.036 percent of Al, 0.056 percent of Nb, 0.08 percent of V, and the balance of Fe and inevitable impurities.
The invention provides a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance, which comprises the following steps:
(1) adding molten iron and/or scrap steel into a converter for smelting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.15 to 0.20 percent of C, 0 to 0.05 percent of Si, 0.5 to 1.3 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 to 0.04 percent of Al, 0.03 to 0.08 percent of Nb, 0.03 to 0.10 percent of V, and the balance of Fe and inevitable impurities;
preferably, the continuous casting steel slab comprises, in mass percent: 0.16 to 0.19 percent of C, 0 to 0.05 percent of Si, 0.5 to 1.0 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 to 0.04 percent of Al, 0.04 to 0.08 percent of Nb, 0.04 to 0.10 percent of V, and the balance of Fe and inevitable impurities;
preferably, the continuous casting steel slab comprises, in mass percent: 0.18 percent of C, 0.02 percent of Si, 0.85 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.036 percent of Al, 0.056 percent of Nb, 0.08 percent of V, and the balance of Fe and inevitable impurities;
(2) carrying out heat treatment on the continuous casting billet in the step (1);
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
(4) and (4) carrying out laminar cooling on the strip steel obtained in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance.
In one embodiment, in the method for manufacturing a high frequency induction welded steel pipe raw material steel having high wear resistance according to the present invention, in the step (2), the heat treatment includes the steps of: heating the continuous casting billet in the step (1) to 1100-1200 ℃, and preserving heat for 120-150 min;
preferably, in the step (2), the heat treatment includes the steps of: heating the continuous casting billet in the step (1) to 1150 ℃, and preserving heat for 135 min;
preferably, in the step (3), the initial rolling temperature of the rough rolling is 1000-1100 ℃, and 1050 ℃ is preferred;
preferably, in the step (3), the finish rolling temperature of the rough rolling is 950-1050 ℃, preferably 1000 ℃;
preferably, in the step (3), the total reduction rate of the rough rolling is 75-85%, preferably 80%;
preferably, in the step (3), the thickness of the intermediate steel billet is 26-30 mm;
preferably, in the step (3), the temperature difference between the head and the tail of the intermediate steel coil is 25-30 ℃;
preferably, in the step (3), the initial rolling temperature of the finish rolling is 930-1050 ℃, and preferably 980 ℃;
preferably, in the step (3), the finish rolling temperature of the finish rolling is 800-900 ℃, and preferably 850 ℃;
preferably, in the step (3), the total reduction rate of the finish rolling is 40 to 50%, preferably 45%.
In one embodiment, in the method for manufacturing a high frequency induction welded steel pipe raw material steel having high wear resistance according to the present invention, in the step (4), the laminar cooling includes the steps of: cooling the strip steel obtained in the step (3) to 600-650 ℃ at a cooling rate of 50-70 ℃/s, and then cooling to 15-30 ℃ at a cooling rate of 1-3 ℃/s;
preferably, in the step (4), the laminar cooling includes the steps of: cooling the strip steel obtained in the step (3) to 600-650 ℃ at a cooling rate of 50-70 ℃/s, and then placing the strip steel in a slow cooling pit for more than or equal to 24 hours to obtain the slow-cooled strip steel; cooling the slowly cooled strip steel to 15-30 ℃ at a cooling rate of 1-3 ℃/s;
preferably, in the step (4), the laminar cooling includes the steps of: cooling the strip steel obtained in the step (3) to 600-650 ℃ at a cooling rate of 50-70 ℃/s, and then coiling to obtain a hot rolled steel coil; placing the hot rolled steel coil in a slow cooling pit for more than or equal to 24 hours to obtain slowly cooled strip steel; cooling the slowly cooled strip steel to 15-30 ℃ at a cooling rate of 1-3 ℃/s; preferably, the step of placing the hot-rolled steel coil in a slow cooling pit for more than or equal to 24 hours comprises the following steps: and placing the hot-rolled steel coil in a slow cooling pit for 24-30 h.
The invention provides the high-frequency induction welding steel pipe raw material steel with high wear resistance, which is prepared by the preparation method of the high-frequency induction welding steel pipe raw material steel with high wear resistance;
preferably, the thickness of the high-frequency induction welding steel pipe raw material steel is 2.6-5.0 mm;
preferably, the yield strength of the high-frequency induction welding steel pipe raw material steel is 520-540 MPa;
preferably, the tensile strength of the high-frequency induction welding steel pipe raw material steel is 580-600 MPa;
preferably, the elongation of the high-frequency induction welding steel pipe raw material steel is 32-35%;
preferably, the microhardness of the high-frequency induction welding steel pipe raw material steel is 200-250 HV 10.
The invention provides a high-frequency induction welded steel pipe with high wear resistance, which is prepared by adopting the high-frequency induction welded steel pipe raw material steel with high wear resistance;
preferably, the microhardness of the high-frequency induction welding steel pipe with high wear resistance is 245-265 HV 10.
In one embodiment, the method for manufacturing a high frequency induction welded steel pipe having high wear resistance according to the present invention comprises the steps of:
rolling and forming the high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
preferably, the roll forming of the high-frequency induction welded steel pipe raw material steel with high wear resistance comprises: and sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the high-frequency induction welding steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welding steel pipe with high wear resistance.
In one embodiment, in the method for manufacturing a high frequency induction welded steel pipe having high wear resistance according to the present invention, the heat treatment comprises the steps of: heating the welded seam to 750-850 ℃ to obtain a heated welded seam; and cooling the heated welding line to 550-650 ℃ at a cooling rate of 5-10 ℃/s, and then cooling to 15-30 ℃ in an air cooling mode.
The invention provides a carrier roller with high wear resistance, which is prepared from the high-frequency induction welding steel pipe raw material steel with high wear resistance.
Specifically, the high-frequency induction welded steel pipe raw material steel with high wear resistance obtained by the present invention has an ultra-fine feature of 2.5 μm or less, and a large amount of nano-scale carbides with a particle size of 1 to 50nm are distributed in the matrix of the steel pipe raw material, so that the steel pipe has a significant work hardening rate.
The preparation method of the high-wear-resistance high-frequency induction welded steel pipe raw material steel realizes the thinning of ferrite structure to be within 2.5 mu m, the thickness is 2.6-5.0 mm, the elongation exceeds 32%, and the microhardness exceeds 200HV 10. Furthermore, the microstructure of the high-frequency induction welding steel pipe raw material steel with high wear resistance is ferrite, the average grain size of the ferrite is 1.0-2.5 mu m, and the ferrite structure contains a nanoscale second phase with the average grain diameter of 1-50nm, as shown in figure 1.
In the preparation process of the high-frequency induction welded steel pipe, a pipe manufacturing procedure of roll forming is carried out, and the welding seam of the welded steel pipe is subjected to online heat treatment, wherein the structures of the welding seam and a heat affected zone are ultrafine ferrite structures, and a small amount of granular bainite structures can exist in the welding seam structure.
In the preparation method of the high-frequency induction welding steel pipe raw material steel with high wear resistance, the continuous casting billet obtained in the step (2) is subjected to rough rolling to obtain an intermediate billet; and carrying out finish rolling on the intermediate steel billet to obtain a strip steel, and carrying out rough rolling and finish rolling on the heated continuous casting plate blank. Wherein, the rough rolling adopts a 1+5 mode, namely: rolling for 1 pass by R1, and rolling for 5 times by R2, wherein the total rolling reduction rate of the rough rolling is 75-85%, and preferably 80%; and 7-pass rolling is adopted in the finish rolling.
According to the preparation method of the high-frequency induction welded steel pipe with high wear resistance, the welding seam obtained by welding needs to be subjected to online cooling treatment after being subjected to heat treatment, the cooling treatment is carried out after a deburring device is used for 3 seconds, and the cooling speed is controlled to be 5-10 ℃/s so as to prevent a heat affected zone from forming a coarsened structure. Finally, the structures of the welding seam and the heat affected zone are ultrafine ferrite structures, and a small amount of granular bainite structures can exist in the welding seam structure.
The high-frequency induction welding steel pipe raw material steel with high wear resistance adopts chemical elements with special proportion, and combines the technological measures in the preparation method of the high-frequency induction welding steel pipe raw material steel, so that an ultrafine ferrite structure with excellent cold forming property and weldability can be obtained, the shearing property and the cold forming property in the preparation process of the high-frequency induction welding steel pipe are ensured, and the cracking of the raw material steel in the shearing and pipe manufacturing process is prevented. The high-frequency induction welded steel pipe has an ultra-fine ferrite structure, and can be further remarkably hardened at a position of 1-3 mu m of the surface of the steel pipe along with the progress of abrasion in the operation process to form a work hardening layer, so that the abrasion resistance of the steel pipe in the service process is improved.
Specifically, when the high-frequency induction welded steel pipe is prepared, the high-precision ovality is realized by controlling the roll pass required for preparing the steel pipe, and the high-frequency induction welded steel pipe raw material steel obtained by the method is beneficial to obtaining higher-precision ovality, and the deviation of the ovality is controlled within the range of +/-0.05 mm, so that the smooth running of the pipe body of the steel pipe is ensured, and the radial run-out is reduced. The higher the ovality of the steel pipe is, the smaller the radial runout of the pipe body of the steel pipe in the operation process is, so that the local accelerated wear can be prevented, the overall operation stability of the pipe body of the steel pipe can be improved, and the wear resistance is improved.
In addition, in the preparation process of a common steel pipe, a welding seam is a key link in high-frequency induction welding, and the tissue structure and the performance of the welding seam are different from those of a parent steel pipe material. In the invention, in order to improve the uniformity of the organization structure and the performance of the tube body of the high-frequency induction welded steel tube, the tube body of the steel tube is subjected to online heat treatment, so that the performance of a welding seam is improved, the obtained steel tube is ensured to be uniformly worn in service, the running stability is improved, and the wear resistance of the whole tube is also improved.
In addition, in the preparation process of the high-frequency induction welded steel pipe raw material steel, the structure of the raw material steel is controlled to be ferrite, the average grain size of the structure of the ferrite is ensured to be less than 2.5 mu m, and the average grain diameter of second phase particles is limited to be 1-50nm (the hardness of a ferrite matrix is improved by the second phase particles); wherein, when the average grain size of the ferrite phase is too large, the desired hardness and work hardening rate cannot be ensured, and therefore, the preparation method of the present invention limits the average grain size of the second phase particles to 1 to 50nm, thereby ensuring high strength, high hardness and excellent cold formability of the raw material steel; when the average grain size of the nano-sized precipitates in the ferrite phase exceeds 50nm, the elongation of the tube body of the raw material steel is lowered.
In the high-frequency induction welded steel pipe raw material steel, elements C, Mn, Nb and V are key characteristic elements, wherein the design principle of each chemical element in the invention is as follows:
c is one of the most economic strengthening elements in steel, and the wear resistance of the matrix can be obviously improved by properly increasing the content of the C element. However, the higher the C content is, the better the C content is, and the too high C content affects the cold formability, the low-temperature toughness and the welding performance of the raw material steel; and the low content of the C element can affect the wear resistance of the steel matrix of the raw material. Therefore, the invention obtains the element proportions of the raw material steel of the high-frequency induction welding steel pipe through comprehensive consideration and a large number of screening tests.
Si is a solid solution strengthening element, an fayalite phase is easily formed, the removal difficulty in a dephosphorization stage is increased, the surface quality of the raw material steel is not facilitated, and the plastic toughness and the weldability of the raw material steel are easily adversely affected. Therefore, the Si content of the raw material steel is controlled within 0.05% through a large amount of screening tests after comprehensive consideration.
Mn is a solid solution strengthening element, and when the Mn content is too high, a severe band structure is formed, thereby decreasing elongation and affecting cold formability. Therefore, the present invention comprehensively considers that the Mn content is limited to 0.5% to 1.3%, and preferably 0.5% to 1.0% in the raw steel of the present invention through a large number of screening tests.
P and S are impurity elements in the steel, and the P element easily causes the center segregation of the steel, thereby deteriorating the weldability and the plastic toughness of the steel; however, the S element tends to form MnS inclusions together with the Mn element, which results in a decrease in weldability and formability of the steel material. Therefore, the content of P is limited to be less than or equal to 0.008% and the content of S is limited to be less than or equal to 0.005% in the raw material steel through a large number of screening tests after comprehensive consideration.
Al acts as a deoxidizer during steel making, but if the Al content is too high, it causes the formation of an excessive amount of AlN inclusions in the steel, thereby lowering the elongation of the steel. Therefore, the invention considers the deoxidation and the cold formability comprehensively, and through a large number of screening tests, the Al content in the raw material steel is limited to 0.03-0.04%.
Nb and V act as second phase forming elements, exert a precipitation strengthening effect, and have an effect of suppressing the recovery of austenite and the grain growth of recrystallization in the hot rolling step, thereby enabling the ferrite phase to have a desired grain size; furthermore, the second phase particles belong to a hard phase, which increases the wear resistance of the matrix, and in particular the second phase particles of V further increase the wear resistance of the matrix. However, when the Nb and V contents are too high, the rolling difficulty of the hot rolling process is significantly increased on the one hand, and the ductility is also reduced on the other hand. Therefore, by comprehensive consideration and through a large number of screening tests, the Nb content is limited to 0.03-0.08%, and the V content is limited to 0.03-0.10% in the raw steel; further, the invention limits the Nb element to 0.04-0.08%, and limits the V element to 0.04-0.1%.
In the invention, in order to ensure that the high-precision ovality requirement can be obtained when the high-frequency induction welded steel pipe is prepared by adopting the raw material steel, the structure of the raw material steel is controlled to be ferrite, and the average grain size of the ferrite structure is ensured to be less than 2.5 mu m; the hardness of the ferrite matrix is increased by the second phase particles, and the average particle diameter of the second phase particles is preferably limited to 1 to 50 nm. Further, when the average grain size of the ferrite phase is large, desired hardness and work hardening rate cannot be secured. When the average particle diameter of the second phase particles exceeds 50nm, the elongation of the raw material steel is lowered.
In the preparation process of the raw material steel, the laminar cooling adopts a two-stage mode, the first stage is in an ultra-fast cooling mode, the strip steel is cooled to the coiling temperature at the speed of more than or equal to 50 ℃/s, then is placed in a slow cooling pit and is kept for more than or equal to 24 hours, and then is slowly cooled to 15-30 ℃ after being taken out of the pit.
In the preparation process of the raw material steel, the heating temperature is 1100-1200 ℃ in the heat treatment of the continuous casting billet; the heating temperature of the continuous casting billet is determined according to the solid solution and precipitation of Nb and V in the steel and the coarsening behavior of original austenite grains in the steel. In the preparation process, when the heating temperature is lower, a precipitated phase generated by the continuous casting billet is not dissolved, so that the final strength of the raw material steel is influenced; when the heating temperature is high, austenite grains of the obtained continuous casting billet tend to be coarsened, so that the refinement of the final ferrite structure is influenced, and the desired strength and cold formability cannot be ensured.
In the preparation process of the raw material steel, the finish rolling temperature of the finish rolling is 800-900 ℃; when the finishing temperature exceeds 900 ℃, the nonuniformity of the ferrite phase of the obtained strip steel is increased; on the other hand, when the finish rolling temperature of the finish rolling is less than 800 ℃, the two-phase region rolling tends to be entered, resulting in an increase in the unevenness of the structure of the raw steel.
In the preparation process of the raw material steel, the strip steel is cooled to 600-650 ℃ at a cooling rate of more than or equal to 50 ℃/s during laminar cooling, and then is coiled. Wherein, at the cooling rate, on one hand, the transformation of pearlite and proeutectoid ferrite can be inhibited, so that the supersaturated carbon content of ferrite is maintained, and the matrix hardness of the raw material steel is remarkably improved; on the other hand, the nucleation rate can be increased, and conditions are provided for tissue ultra-fining. According to the ferrite phase size and the second phase particle size of the raw material steel, the coiling temperature is designed to be 600-650 ℃. When the coiling temperature is lower than 600 ℃, the precipitation of second phase particles in a ferrite region is not facilitated, so that the hardness of the raw material steel is influenced; when the coiling temperature exceeds 650 ℃, the phase average grain size of ferrite exceeds 2.5 μm, and the second phase grains increase, resulting in a decrease in hardness of the raw material steel.
In the preparation process of the raw material steel, the strip steel is coiled at the temperature of 600-650 ℃, placed in a slow cooling pit for more than or equal to 24 hours, taken out of the pit and slowly cooled to 15-30 ℃. In the invention, the main purpose of placing the strip steel in the slow cooling pit for cooling is to ensure that second-phase precipitates of the raw material steel can be fully precipitated, thereby improving the matrix hardness of the raw material steel. In the present invention, the temperature of the annealing pit is lower than 400 ℃, which will not easily cause coarsening of the structure and second-phase precipitates in the raw steel.
Aiming at the service characteristics of the steel for the carrier roller of the belt conveyor, the wear resistance of the high-frequency induction welded steel pipe can be improved by designing the component proportion and the preparation process in the raw material steel of the high-frequency induction welded steel pipe.
The high-frequency induction welded steel pipe raw material steel has the characteristics of easiness in forming, easiness in welding and high work hardening degree; the wear resistance of the welded steel pipe and the carrier roller in service prepared from the high-frequency induction welded steel pipe raw material steel is further improved. In addition, the wear resistance of the high-frequency induction welded steel pipe of the present invention can be further improved by controlling the ovality of the high-frequency induction welded steel pipe of the present invention with high accuracy (i.e., by controlling the ovality of the roll pass in pipe making with high accuracy).
Drawings
Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a metallographic image showing a structure of a steel material for a high-frequency induction welded steel pipe produced in examples 1 to 5 of the present invention.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
Example 1: preparation of the high-frequency induction welded steel pipe
Firstly, the invention discloses a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance
(1) Adding molten iron into a converter for smelting and continuous casting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.15 percent of C, 0.5 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 percent of Al, 0.03 percent of Nb, 0.03 percent of V, and the balance of Fe and inevitable impurities;
(2) heating the continuous casting billet in the step (1) to 1100 ℃, and preserving heat for 120 min;
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-to-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
in the rough rolling step, the rough rolling adopts a 1+5 mode rolling process, phosphorus removal is carried out on R1 in 1 pass, and phosphorus removal is carried out on R2 in 1, 3 and 5 passes; then coiling by a plate box, reducing the head-tail temperature difference, controlling the head-tail temperature difference to be 25-30 ℃, and creating a good temperature condition for the stability of finish rolling; the initial rolling temperature of rough rolling is 1000 ℃, the final rolling temperature of rough rolling is 950 ℃, the total rolling reduction rate of rough rolling is 75%, and the thickness of the obtained intermediate billet is 26 mm;
in the finish rolling step, removing phosphorus from the intermediate steel billet by using high-pressure water of 18-25 MPa before finish rolling, and removing iron scale so as to avoid influencing the surface quality; adopting 7-pass rolling in the finish rolling process, wherein the start rolling temperature of the finish rolling is 930 ℃, the finish rolling temperature of the finish rolling is 800 ℃, and the total rolling reduction rate of the finish rolling is 40%;
(4) carrying out laminar cooling on the strip steel in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance;
wherein the laminar cooling comprises the following steps: cooling the strip steel to 600 ℃ at a cooling rate of 50 ℃/s, and then coiling to obtain a hot rolled steel coil; the hot rolled steel coil was then placed in a slow cooling pit for 24h and then cooled to 30 ℃ at a cooling rate of 1 ℃/s.
Secondly, the preparation of the high-frequency induction welding steel pipe with high wear resistance
Sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the prepared high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
wherein:
(1) in the longitudinal shearing and splitting process, ensuring that the raw material steel has no wave shape or allows slight wave shape so as to ensure the dimensional precision;
(2) in the rolling forming process, deformation amount distribution is carried out on deformation of each pass, and springback compensation is properly carried out to ensure the dimensional accuracy after pipe making;
(3) in the welding process, internal and external burrs are removed after high-frequency induction welding, wherein the arc shape of the knife edge of the removing device is controlled to ensure the ovality.
(4) In the heat treatment process, heating the welded seam to 750 ℃ to obtain a heated welded seam; and cooling the heated welding line to 550 ℃ at a cooling rate of 5 ℃/s, and then cooling to 15 ℃ in an air cooling mode.
(5) In the sawing process, the raw material steel after heat treatment is subjected to on-line sawing, so that the high-frequency induction welded steel pipe with high wear resistance is obtained.
In the high-frequency induction welded steel pipe raw material steel with high wear resistance prepared by the embodiment: the yield strength is 520MPa, the tensile strength is 580MPa, the elongation is 32 percent, the microhardness is 200HV10, and the cold bending is qualified when the d is 180 degrees. The microhardness of the high-frequency induction welded steel pipe prepared in this example was 245HV 10.
Example 2: preparation of the high-frequency induction welded steel pipe
Firstly, the invention discloses a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance
(1) Adding molten iron into a converter for smelting and continuous casting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.20 percent of C, 0.05 percent of Si, 1.3 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.04 percent of Al, 0.08 percent of Nb, 0.1 percent of V, and the balance of Fe and inevitable impurities;
(2) heating the continuous casting billet in the step (1) to 1200 ℃, and keeping the temperature for 150 min;
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-to-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
in the rough rolling step, the rough rolling adopts a 1+5 mode rolling process, phosphorus removal is carried out on R1 in 1 pass, and phosphorus removal is carried out on R2 in 1, 3 and 5 passes; then coiling by a plate box, reducing the head-tail temperature difference, controlling the head-tail temperature difference to be 25-30 ℃, and creating a good temperature condition for the stability of finish rolling; the initial rolling temperature of rough rolling is 1100 ℃, the final rolling temperature of the rough rolling is 1050 ℃, the total rolling reduction rate of the rough rolling is 85%, and the thickness of the obtained intermediate billet is 30 mm;
in the finish rolling step, removing phosphorus from the intermediate steel billet by using high-pressure water of 18-25 MPa before finish rolling, and removing iron scale so as to avoid influencing the surface quality; adopting 7-pass rolling in the finish rolling process, wherein the start rolling temperature of the finish rolling is 1050 ℃, the finish rolling temperature of the finish rolling is 900 ℃, and the total rolling reduction rate of the finish rolling is 50%;
(4) carrying out laminar cooling on the strip steel in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance;
wherein the laminar cooling comprises the following steps: cooling the strip steel to 650 ℃ at a cooling rate of 70 ℃/s, and then coiling to obtain a hot rolled steel coil; the hot rolled steel coil was then placed in a slow cooling pit for 30h and then cooled to 15 ℃ at a cooling rate of 3 ℃/s.
Secondly, the preparation of the high-frequency induction welding steel pipe with high wear resistance
Sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the prepared high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
wherein:
(1) in the longitudinal shearing and splitting process, ensuring that the raw material steel has no wave shape or allows slight wave shape so as to ensure the dimensional precision;
(2) in the rolling forming process, deformation amount distribution is carried out on deformation of each pass, and springback compensation is properly carried out to ensure the dimensional accuracy after pipe making;
(3) in the welding process, internal and external burrs are removed after high-frequency induction welding, wherein the arc shape of the knife edge of the removing device is controlled to ensure the ovality.
(4) In the heat treatment process, heating the welded seam to 850 ℃ to obtain a heated welded seam; and cooling the heated welding line to 650 ℃ at a cooling rate of 10 ℃/s, and then cooling to 30 ℃ in an air cooling mode.
(5) In the sawing process, the raw material steel after heat treatment is subjected to on-line sawing, so that the high-frequency induction welded steel pipe with high wear resistance is obtained.
In the high-frequency induction welded steel pipe raw material steel with high wear resistance prepared by the embodiment: the yield strength is 530MPa, the tensile strength is 590MPa, the elongation is 32 percent, the microhardness is 210HV10, and the cold bending is qualified when the d is 180 degrees. The microhardness of the high-frequency induction welded steel pipe prepared in this example was 250HV 10.
Example 3: preparation of the high-frequency induction welded steel pipe
Firstly, the invention discloses a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance
(1) Adding molten iron into a converter for smelting and continuous casting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.16 percent of C, 0.5 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.03 percent of Al, 0.04 percent of Nb, 0.04 percent of V, and the balance of Fe and inevitable impurities;
(2) heating the continuous casting billet in the step (1) to 1100 ℃, and preserving heat for 120 min;
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-to-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
in the rough rolling step, the rough rolling adopts a 1+5 mode rolling process, phosphorus removal is carried out on R1 in 1 pass, and phosphorus removal is carried out on R2 in 1, 3 and 5 passes; then coiling by a plate box, reducing the head-tail temperature difference, controlling the head-tail temperature difference to be 25-30 ℃, and creating a good temperature condition for the stability of finish rolling; the initial rolling temperature of rough rolling is 1000 ℃, the final rolling temperature of rough rolling is 950 ℃, the total rolling reduction rate of rough rolling is 85%, and the thickness of the obtained intermediate billet is 30 mm;
in the finish rolling step, removing phosphorus from the intermediate steel billet by using high-pressure water of 18-25 MPa before finish rolling, and removing iron scale so as to avoid influencing the surface quality; adopting 7-pass rolling in the finish rolling process, wherein the start rolling temperature of the finish rolling is 1050 ℃, the finish rolling temperature of the finish rolling is 900 ℃, and the total rolling reduction rate of the finish rolling is 50%;
(4) carrying out laminar cooling on the strip steel in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance;
wherein the laminar cooling comprises the following steps: cooling the strip steel to 650 ℃ at a cooling rate of 50 ℃/s, and then coiling to obtain a hot rolled steel coil; the hot rolled steel coil was then placed in a slow cooling pit for 30h and then cooled to 25 ℃ at a cooling rate of 3 ℃/s.
Secondly, the preparation of the high-frequency induction welding steel pipe with high wear resistance
Sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the prepared high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
wherein:
(1) in the longitudinal shearing and splitting process, ensuring that the raw material steel has no wave shape or allows slight wave shape so as to ensure the dimensional precision;
(2) in the rolling forming process, deformation amount distribution is carried out on deformation of each pass, and springback compensation is properly carried out to ensure the dimensional accuracy after pipe making;
(3) in the welding process, internal and external burrs are removed after high-frequency induction welding, wherein the arc shape of the knife edge of the removing device is controlled to ensure the ovality.
(4) In the heat treatment process, heating the welded seam to 750 ℃ to obtain a heated welded seam; and cooling the heated welding line to 650 ℃ at a cooling rate of 10 ℃/s, and then cooling to 30 ℃ in an air cooling mode.
(5) In the sawing process, the raw material steel after heat treatment is subjected to on-line sawing, so that the high-frequency induction welded steel pipe with high wear resistance is obtained.
In the high-frequency induction welded steel pipe raw material steel with high wear resistance prepared by the embodiment: the yield strength is 530MPa, the tensile strength is 595MPa, the elongation is 33 percent, the microhardness is 235HV10, and the cold bending is qualified when the d is 180 degrees. The microhardness of the high-frequency induction welded steel pipe produced in this example was 249HV 10.
Example 4: preparation of the high-frequency induction welded steel pipe
Firstly, the invention discloses a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance
(1) Adding molten iron into a converter for smelting and continuous casting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.19 percent of C, 0.05 percent of Si, 1.0 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.04 percent of Al, 0.08 percent of Nb, 0.1 percent of V, and the balance of Fe and inevitable impurities;
(2) heating the continuous casting billet in the step (1) to 1050 ℃, and preserving heat for 130 min;
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-to-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
in the rough rolling step, the rough rolling adopts a 1+5 mode rolling process, phosphorus removal is carried out on R1 in 1 pass, and phosphorus removal is carried out on R2 in 1, 3 and 5 passes; then coiling by a plate box, reducing the head-tail temperature difference, controlling the head-tail temperature difference to be 25-30 ℃, and creating a good temperature condition for the stability of finish rolling; the initial rolling temperature of rough rolling is 1020 ℃, the final rolling temperature of the rough rolling is 1050 ℃, the total rolling reduction rate of the rough rolling is 80%, and the thickness of the obtained intermediate billet is 29 mm;
in the finish rolling step, removing phosphorus from the intermediate steel billet by using high-pressure water of 18-25 MPa before finish rolling, and removing iron scale so as to avoid influencing the surface quality; adopting 7-pass rolling in the finish rolling process, wherein the start rolling temperature of the finish rolling is 930 ℃, the finish rolling temperature of the finish rolling is 900 ℃, and the total rolling reduction rate of the finish rolling is 45%;
(4) carrying out laminar cooling on the strip steel in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance;
wherein the laminar cooling comprises the following steps: cooling the strip steel to 630 ℃ at a cooling rate of 60 ℃/s, and then coiling to obtain a hot rolled steel coil; the hot rolled steel coil was then placed in a slow cooling pit for 28h and then cooled to 30 ℃ at a cooling rate of 2 ℃/s.
Secondly, the preparation of the high-frequency induction welding steel pipe with high wear resistance
Sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the prepared high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
wherein:
(1) in the longitudinal shearing and splitting process, ensuring that the raw material steel has no wave shape or allows slight wave shape so as to ensure the dimensional precision;
(2) in the rolling forming process, deformation amount distribution is carried out on deformation of each pass, and springback compensation is properly carried out to ensure the dimensional accuracy after pipe making;
(3) in the welding process, internal and external burrs are removed after high-frequency induction welding, wherein the arc shape of the knife edge of the removing device is controlled to ensure the ovality.
(4) In the heat treatment process, heating the welded seam to 850 ℃ to obtain a heated welded seam; and cooling the heated welding line to 550 ℃ at a cooling rate of 8 ℃/s, and then cooling to 25 ℃ in an air cooling mode.
(5) In the sawing process, the raw material steel after heat treatment is subjected to on-line sawing, so that the high-frequency induction welded steel pipe with high wear resistance is obtained.
In the high-frequency induction welded steel pipe raw material steel with high wear resistance prepared by the embodiment: the yield strength is 530MPa, the tensile strength is 590MPa, the elongation is 34 percent, the microhardness is 240HV10, and the cold bending is qualified when the d is 180 degrees. The microhardness of the high-frequency induction welded steel pipe prepared in this example was 260HV 10.
Example 5: preparation of the high-frequency induction welded steel pipe
Firstly, the invention discloses a preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance
(1) Adding molten iron into a converter for smelting and continuous casting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.18 percent of C, 0.02 percent of Si, 0.85 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, 0.036 percent of Al, 0.056 percent of Nb, 0.08 percent of V, and the balance of Fe and inevitable impurities;
(2) heating the continuous casting billet in the step (1) to 1150 ℃, and preserving heat for 135 min;
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel; in the step, when the intermediate steel billet is coiled, a plate coil box is adopted for coiling, so that the head-to-tail temperature difference of the intermediate steel coil is controlled to be 25-30 ℃;
in the rough rolling step, the rough rolling adopts a 1+5 mode rolling process, phosphorus removal is carried out on R1 in 1 pass, and phosphorus removal is carried out on R2 in 1, 3 and 5 passes; then coiling by a plate box, reducing the head-tail temperature difference, controlling the head-tail temperature difference to be 25-30 ℃, and creating a good temperature condition for the stability of finish rolling; the initial rolling temperature of rough rolling is 1050 ℃, the final rolling temperature of the rough rolling is 1000 ℃, the total rolling reduction rate of the rough rolling is 80%, and the thickness of the obtained intermediate billet is 27 mm;
in the finish rolling step, removing phosphorus from the intermediate steel billet by using high-pressure water of 18-25 MPa before finish rolling, and removing iron scale so as to avoid influencing the surface quality; adopting 7-pass rolling in the finish rolling process, wherein the start rolling temperature of the finish rolling is 980 ℃, the finish rolling temperature of the finish rolling is 850 ℃, and the total reduction rate of the finish rolling is 45%;
(4) carrying out laminar cooling on the strip steel in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance;
wherein the laminar cooling comprises the following steps: cooling the strip steel to 630 ℃ at a cooling rate of 60 ℃/s, and then coiling to obtain a hot rolled steel coil; the hot rolled steel coil was then placed in a slow cooling pit for 25h and then cooled to 30 ℃ at a cooling rate of 2 ℃/s.
Secondly, the preparation of the high-frequency induction welding steel pipe with high wear resistance
Sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the prepared high-frequency induction welded steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welded steel pipe with high wear resistance;
wherein:
(1) in the longitudinal shearing and splitting process, ensuring that the raw material steel has no wave shape or allows slight wave shape so as to ensure the dimensional precision;
(2) in the rolling forming process, deformation amount distribution is carried out on deformation of each pass, and springback compensation is properly carried out to ensure the dimensional accuracy after pipe making;
(3) in the welding process, internal and external burrs are removed after high-frequency induction welding, wherein the arc shape of the knife edge of the removing device is controlled to ensure the ovality.
(4) In the heat treatment process, heating the welded seam to 850 ℃ to obtain a heated welded seam; and cooling the heated welding line to 650 ℃ at a cooling rate of 10 ℃/s, and then cooling to 30 ℃ in an air cooling mode.
(5) In the sawing process, the raw material steel after heat treatment is subjected to on-line sawing, so that the high-frequency induction welded steel pipe with high wear resistance is obtained.
In the high-frequency induction welded steel pipe raw material steel with high wear resistance prepared by the embodiment: the yield strength is 540MPa, the tensile strength is 600MPa, the elongation is 35%, the microhardness is 250HV10, and the steel is qualified after being cold-bent at 180 degrees d-a. The microhardness of the high-frequency induction welded steel pipe prepared in this example was 265HV 10.
From the above examples 1 to 5, it can be seen that in the high-frequency induction welded steel pipe raw material steel with high wear resistance, the yield strength is not less than 520Mpa, the tensile strength is not less than 580Mpa, the elongation is not less than 32%, the highest elongation can reach 35%, the microhardness is not less than 210HV10, and the 180 ° d ═ a cold bending test is qualified; the high frequency induction welded steel pipe prepared in examples 1 to 5 having high wear resistance was manufactured with a bore of
The microhardness of the high-frequency induction welded steel pipe is more than or equal to 245HV10, and is improved by 15-35 HV10 compared with the prepared raw material steel.
In the raw material steels obtained in examples 1 to 5 above, the microstructures were all ferrite, the average grain size of the ferrite structure was 2.5 μm or less, and the average grain size of the composite carbonitride was 1 to 50 nm. The weld joint structure of the high-frequency induction welded steel pipe raw material steel prepared by the invention after heat treatment is a mixed structure of ferrite and granular bainite, and the heat affected zone of the weld joint structure is a fine ferrite structure. The ovality of the high-frequency induction welded steel pipe prepared in the above example was controlled within a range of ± 0.05 mm.
In addition, the actual service life of the carrier roller prepared from the raw material steel is longer than 50000 hours, the national standard requirement is met, and the service life of the carrier roller is prolonged by 3-4 times compared with that of a carrier roller made of Q235 material.
In conclusion, the above description of the embodiments of the present invention is not intended to limit the present invention, and those skilled in the art can make various changes or modifications according to the present invention without departing from the spirit of the present invention, which falls within the scope of the appended claims.
Claims (7)
1. A preparation method of high-frequency induction welding steel pipe raw material steel with high wear resistance comprises the following steps:
(1) adding molten iron and/or scrap steel into a converter for smelting to obtain a continuous casting billet, wherein the continuous casting billet is obtained; the continuous casting steel billet comprises the following components in percentage by mass: 0.16-0.19% of C, 0-0.05% of Si, 0.5-1.0% of Mn, less than or equal to 0.008% of P, less than or equal to 0.005% of S, 0.03-0.04% of Al, 0.04-0.08% of Nb, 0.04-0.10% of V, and the balance of Fe and inevitable impurities, wherein the microstructure of the high-wear-resistance high-frequency induction welding steel pipe raw material steel is ferrite, the average grain size of the ferrite is 1.0-2.5 mu m, and the ferrite structure contains a nanoscale second phase with the average grain diameter of 1-50 nm;
(2) carrying out heat treatment on the continuous casting billet in the step (1);
(3) roughly rolling the continuous casting billet obtained in the step (2) to obtain an intermediate billet; coiling the intermediate steel billet to obtain an intermediate steel coil; uncoiling the intermediate steel coil, and then performing finish rolling to obtain strip steel, wherein the initial rolling temperature of the rough rolling is 1000-1100 ℃; the finish rolling temperature of the rough rolling is 950-1050 ℃; the total reduction rate of the rough rolling is 75-85%; the thickness of the intermediate steel billet is 26-30 mm; the head-tail temperature difference of the intermediate steel coil is 25-30 ℃; the initial rolling temperature of the finish rolling is 930-1050 ℃; the finish rolling temperature of the finish rolling is 800-900 ℃; the total rolling reduction rate of the finish rolling is 40-50%;
(4) carrying out laminar cooling on the strip steel obtained in the step (3) to obtain the high-frequency induction welding steel pipe raw material steel with high wear resistance, wherein the laminar cooling comprises the following steps: cooling the strip steel obtained in the step (3) to 600-650 ℃ at a cooling rate of 50-70 ℃/s, and then coiling to obtain a hot rolled steel coil; placing the hot rolled steel coil in a slow cooling pit for 24-30 h to obtain slow-cooled strip steel; and cooling the slowly cooled strip steel to 15-30 ℃ at a cooling rate of 1-3 ℃/s.
2. The method for producing a high frequency induction welded steel pipe raw material steel having high wear resistance as recited in claim 1, wherein in said step (2), said heat treatment comprises the steps of: and (2) heating the continuous casting billet in the step (1) to 1100-1200 ℃, and preserving heat for 120-150 min.
3. A high-frequency induction welded steel pipe raw material steel having high wear resistance produced by the production method for a high-frequency induction welded steel pipe raw material steel having high wear resistance according to any one of claims 1 to 2;
the thickness of the high-frequency induction welding steel pipe raw material steel is 2.6-5.0 mm;
the yield strength of the high-frequency induction welding steel pipe raw material steel is 520-540 MPa;
the tensile strength of the high-frequency induction welded steel pipe raw material steel is 580-600 MPa;
the elongation of the high-frequency induction welded steel pipe raw material steel is 32-35%;
the microhardness of the high-frequency induction welding steel pipe raw material steel is 200-250 HV 10.
4. A high-frequency induction welded steel pipe having high wear resistance produced by using the high-frequency induction welded steel pipe raw material steel having high wear resistance according to claim 3;
the microhardness of the high-frequency induction welding steel pipe with high wear resistance is 245-265 HV 10.
5. The method for producing a high-frequency induction welded steel pipe having high wear resistance according to claim 4, comprising the steps of:
and sequentially carrying out longitudinal shearing and splitting, roll forming, welding, heat treatment and saw cutting on the high-frequency induction welding steel pipe raw material steel with high wear resistance to obtain the high-frequency induction welding steel pipe with high wear resistance.
6. The method for producing a high-frequency induction welded steel pipe having high wear resistance as claimed in claim 5, wherein the heat treatment comprises the steps of: heating the welded seam to 750-850 ℃ to obtain a heated welded seam; and cooling the heated welding line to 550-650 ℃ at a cooling rate of 5-10 ℃/s, and then cooling to 15-30 ℃ in an air cooling mode.
7. A carrier roller having high wear resistance, produced using the high-frequency induction welded steel pipe raw material steel having high wear resistance of claim 1.
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| CN104831175B (en) * | 2014-11-25 | 2017-09-29 | 宝鸡石油钢管有限责任公司 | A kind of J55 grade of steels SEW expansion sleeves and its manufacture method |
| CN108441761B (en) * | 2018-03-07 | 2020-05-22 | 首钢集团有限公司 | Hot-rolled strip steel for wear-resistant carrier roller and manufacturing method thereof |
| CN109023049A (en) * | 2018-08-10 | 2018-12-18 | 首钢集团有限公司 | A kind of carrying roller welded still pipe and its manufacturing method |
| CN110055396B (en) * | 2019-04-26 | 2021-04-16 | 首钢集团有限公司 | Postweld cooling method for high-frequency induction welded steel pipe |
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