CN115612935A - Hot-rolled winding drum high-performance sector plate and manufacturing method thereof - Google Patents
Hot-rolled winding drum high-performance sector plate and manufacturing method thereof Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
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- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 29
- 239000010959 steel Substances 0.000 abstract description 29
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
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- 230000000052 comparative effect Effects 0.000 description 3
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/28—Drums or other coil-holders
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D2211/00—Microstructure comprising significant phases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a hot-rolled winding drum high-performance sector plate which comprises the following chemical components in percentage by mass: c:0.16-0.25%, si:0.17-0.55%, mn:0.8-1.2%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:10-12%, ni:1.2-1.5%, mo:1.2-1.6%, V:0.5-0.8%, W:0.3-0.4%, ti:0.25 to 0.35 percent, the balance being Fe, and the Cr + Ni + Mo is more than or equal to 13 percent. The invention also discloses a manufacturing method of the hot-rolled winding drum high-performance sector plate. According to the invention, by optimizing alloy components and optimizing a heat treatment process, the plasticity and toughness of steel are improved, and the cold and hot fatigue resistance is improved, so that the service life of the hot-rolled drum sector plate is prolonged.
Description
Technical Field
The invention belongs to the field of large-scale metallurgical equipment materials and heat treatment thereof, and particularly relates to a hot-rolled drum sector plate and a manufacturing method thereof.
Background
The coiling machine is an important device of a strip steel production line of various steel mills, in particular to a hot continuous rolling strip steel production line. The sector plate is one of important parts of a coiler mandrel, and is subjected to the high temperature of 500 ℃ of strip steel, the circulation and alternation action of a cooling medium, coiling tension and strip steel friction and abrasion action in the working process, and the sector plate is easy to deform, crack and lose abrasion. The abrasion and the crack of the sector plate easily cause the accidents of the slipping of a winding drum, poor winding, steel scrap and the like. Therefore, the selection of the sector plate material of the winding drum and the heat treatment process are key factors for prolonging the service life of the winding drum.
Specifically, the method comprises the following steps: in the coiling process of the hot rolled steel plate, the temperature of the steel plate is as high as 600-800 ℃, the weight of a single steel coil can reach 50 tons, the contact time of the steel plate and the sector plate is about 120S, the temperature of the sector plate can reach 500 ℃, the sector plate bears larger radial pressure and thermal stress in work, water is sprayed and rapidly cooled after coil unloading, the sector plate is easy to generate residual stress concentration, local deformation and thermal fatigue, the problems of fatigue crack abrasion and the like exist, and the detection shows that the elongation after fracture of the sector plate is only 10%, the section shrinkage is only 30%, and the impact energy (AKv) is only about 10J, so that the lower plasticity and toughness indexes of the sector plate are the main reasons for generating the thermal fatigue cracks.
Commonly used sector plate materials are typically martensitic heat resistant stainless steels of the nickel chromium tungsten series, such as 2Cr12NiMoWV and the like: the material contains more tungsten which is a strong carbide forming element, and during the forging and heat treatment processes, the tungsten carbide compound is extremely insoluble and is easy to segregate grain boundaries and precipitate, so that the plasticity and toughness of the sector plate are reduced, and the online service time of the sector plate is shortened. When the steel excess of the newly manufactured reel reaches 80 to 100 ten thousand tons, the sector plates are cracked and worn to different degrees.
Disclosure of Invention
The invention aims to solve the problem of providing a hot-rolled winding drum high-performance sector plate and a manufacturing method thereof.
The invention relates to a hot-rolled drum high-performance sector plate, which comprises the following chemical components in percentage by mass: c:0.16-0.25%, si:0.17-0.55%, mn:0.8-1.2%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:10-12%, ni:1.2-1.5%, mo:1.2-1.6%, V:0.5-0.8%, W:0.3-0.4%, ti:0.25 to 0.35 percent, the balance being Fe, and the Cr + Ni + Mo is more than or equal to 13 percent.
Further, the hot-rolled winding drum high-performance sector plate preferably comprises the following chemical components in percentage by mass: c:0.2%, si:0.45%, mn:0.88%, P:0.012%, S:0.008%, cr:11.2%, ni:1.3%, mo:1.3%, V:0.78%, W:0.4%, ti:0.3 percent and the balance of Fe.
Further, the hot-rolled drum high-performance sector plate preferably comprises the following chemical components in percentage by mass: c:0.18%, si:0.41%, mn:0.95%, P:0.010%, S:0.009%, cr:10.8%, ni:1.25%, mo:1.3%, V:0.65%, W:0.33%, ti:0.25 percent and the balance of Fe.
Further, the hot-rolled winding drum high-performance sector plate preferably comprises the following chemical components in percentage by mass: c:0.22%, si:0.4%, mn:1.12%, P:0.014%, S:0.009%, cr:11.7%, ni:1.35%, mo:1.49%, V:0.75%, W:0.36%, ti:0.3 percent and the balance of Fe.
The main alloy element proportion of the high-performance sector plate of the hot-rolled winding drum has the following effects:
1. the C element is an essential element for ensuring the strength of the steel, the content of the C is required to be more than 0.16 percent, and the excessively high content of the C has adverse effects on the plasticity, the toughness and the fatigue resistance of the steel; therefore, the C content in the sector plate should be properly reduced to 0.25% or less, so that the C content of the steel for hot-rolled coil sector plates is preferably controlled to 0.16 to 0.25%;
2. si and Mn are common deoxidizing and desulfurizing elements in steel, play a role in strengthening and improving hardenability, and improve the yield strength and yield ratio of the hot-rolled drum sector plate; when the Si content exceeds 0.6%, inclusions are easy to generate, and the plasticity and toughness of the steel are seriously deteriorated, so that the Si content of the steel for the hot-rolled drum sector plate is preferably controlled to be 0.17-0.55%; mn element is also beneficial to improving the toughness and the wear resistance in the sector plate, so the Mn content of the steel for the hot-rolled drum sector plate is preferably controlled to be 0.8-1.2%;
3. the content of Cr element in the martensitic stainless steel is generally controlled to be 11-13%, the effects of strengthening, improving heat resistance, wear resistance and corrosion resistance are mainly achieved, the high Cr content is easy to cause the reduction of the impact toughness of the steel, the component segregation is easy to generate, and the plasticity is reduced; in order to reduce the usage amount of Cr as much as possible, the Cr is usually added together with elements such as Mn, ni, mo and the like, and Ni can improve the hardenability and the temper softening resistance of the hot-rolled drum sector plate and reduce the content of ferrite in a structure; mo can improve the strength, hardness and tempering stability of the hot-rolled drum sector plate and can inhibit the brittle transition of the sector plate in the repeated heating and cooling process; therefore, the Cr content in the hot-rolled drum sector plate is controlled to be 10.0-12.0 percent, and the Cr + Ni + Mo content is more than or equal to 13 percent;
4. w and Ti are both strong carbide forming elements, and the tempering softening resistance of the steel is improved. After quenching and tempering, carbide is separated out, so that the plasticity and impact toughness of the sector plate can be obviously improved; a proper amount of Ti also has the functions of obviously improving austenitizing temperature, refining grains and improving yield strength. Therefore, the content of W is controlled to be 0.3-0.4%, and the content of Ti is controlled to be 0.25-0.35%;
5. v can refine the structure crystal grains, and the dispersed carbide formed by V and carbon can improve the strength and toughness and the stability of the structure in the repeated heating and cooling process; therefore, the V content is controlled to 0.5 to 0.8%.
The manufacturing method of the hot-rolled winding drum high-performance sector plate comprises the following steps: forging → annealing → rough machining → tempering → semi-finishing → destressing tempering → finishing.
The heat treatment process comprises the following steps:
(1) Annealing: keeping the temperature of 900 +/-20 ℃, cooling the furnace to below 350 ℃, and then cooling the furnace to room temperature;
(2) Tempering: keeping the temperature at 700 +/-10 ℃, keeping the temperature at 920 +/-10 ℃, keeping the temperature at 1050 +/-10 ℃, cooling the oil to be below 200 ℃, keeping the temperature at 700 +/-10 ℃, and cooling the oil to the room temperature;
(3) Stress relief tempering: and (3) preserving the temperature of the semi-finished fan-shaped plate at 600 ℃ for 48 hours, and cooling the semi-finished fan-shaped plate by air.
Furthermore, the temperature rise speed in the heat treatment process is controlled to be 100 +/-20 ℃/h. This can reduce the thermal stress and effectively control the deformation of the sector plate.
Further, the annealing temperature of the hot-rolled winding drum high-performance sector plate is controlled to be 880-920 ℃; the temperature of the third section of heat preservation in the hardening and tempering is controlled between 1040 and 1060 ℃; the heat preservation time of annealing and tempering is controlled to be 1-4 minutes/mm according to the effective thickness of the sector plate.
After the hot-rolled drum high-performance sector plate is subjected to heat treatment, the grain size is more than or equal to 9 grades, the hardness is 230-250 HB, and the structure is tempered sorbite and a small amount of ferrite.
The mechanical properties of the hot-rolled winding drum high-performance sector plate after heat treatment are as follows: the tensile strength is more than or equal to 800MPa; the yield strength is more than or equal to 600MPa; the elongation after fracture is more than or equal to 20 percent, and the reduction of area is more than or equal to 50 percent (toughness); the impact energy AKV is more than or equal to 100J (plasticity).
Therefore, compared with the prior art, the high-performance sector plate of the hot rolling winding drum has higher impact toughness and plasticity, good lasting high-temperature strength, high-temperature thermal fatigue resistance and oxidation resistance and low notch sensitivity by optimizing alloy components and optimizing a heat treatment process, obviously prolongs the service life of the hot rolling winding drum sector plate, and the steel passing amount reaches more than 150 ten thousand tons.
Drawings
FIG. 1 is a metallographic structure of a high performance sector of a hot rolled coil according to the invention.
Detailed Description
The technical solution of the hot rolled coil high performance sector plate and the manufacturing method thereof according to the present invention will be described in further detail with reference to the following examples.
The invention relates to a hot-rolled winding drum high-performance sector plate which comprises the following chemical components in percentage by mass: c:0.16-0.25%, si:0.17-0.55%, mn:0.8-1.2%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:10-12%, ni:1.2-1.5%, mo:1.2-1.6%, V:0.5-0.8%, W:0.3-0.4%, ti:0.25 to 0.35 percent, the balance being Fe, and the Cr + Ni + Mo is more than or equal to 13 percent.
The hot-rolled drum high-performance sector plate can obtain the specific components in the following examples 1-3 through component optimization, and the chemical components of 2Cr12NiMoWV in the examples and the background technology of the invention are shown in the following table 1 in percentage by mass.
TABLE 1 Hot-rolled coil plate Material composition (wt%, balance Fe)
| Categories | C | Mn | Si | P | S | Cr | Mo | Ni | V | W | Ti |
| Example 1 | 0.20 | 0.88 | 0.45 | 0.012 | 0.008 | 11.2 | 1.3 | 1.3 | 0.78 | 0.40 | 0.3 |
| Example 2 | 0.18 | 0.95 | 0.41 | 0.010 | 0.009 | 10.8 | 1.3 | 1.25 | 0.65 | 0.33 | 0.25 |
| Example 3 | 0.22 | 1.12 | 0.4 | 0.014 | 0.009 | 11.7 | 1.49 | 1.35 | 0.75 | 0.36 | 0.3 |
| Comparative example | 0.28 | 0.57 | 0.33 | 0.015 | 0.006 | 11.3 | 0.78 | 0.58 | 0.27 | 0.78 | / |
The hot-rolled drum sector plates of the three embodiments are smelted by an electric furnace, and are manufactured into ingots by adopting an LF external refining process, a VD vacuum degassing process and an electroslag remelting process, and then are manufactured into sector plate blanks (such as 2 meters in length, 0.6 meter in width and 0.6 meter in thickness) by the steps of high-temperature forging and tempering after forging, the blanks are divided into two parts along the thickness direction, rough milling is carried out until the sector plate blanks are molded, and then quenching, semi-finishing, stress-relief tempering and finishing are carried out. The specific heat treatment process of 2Cr12NiMoWV in the three examples of the present invention and the background art is shown in Table 2 below.
TABLE 2 Heat treatment process of hot-rolled drum sector plate
| Categories | Tempering | Stress relief tempering |
| Example 1 | Oil quenching at 700 ℃ for multiplied by 1h at 920 ℃ for multiplied by 1h at 1050 ℃ for multiplied by 3.5h and oil cooling at 700 ℃ for multiplied by 10h | Air cooling at 600 ℃ for 48h |
| Example 2 | Oil quenching at 700 ℃ multiplied by 1h at 920 ℃ multiplied by 1h at 1040 ℃ multiplied by 3.5h and oil cooling at 710 ℃ multiplied by 10h | Air cooling at 600 ℃ for 48h |
| Example 3 | Oil cooling quenching at 700 ℃ multiplied by 1h +920 ℃ multiplied by 1h +1060 ℃ multiplied by 3.5h and oil cooling at 710 ℃ multiplied by 10h | Air cooling at 600 ℃ for 48h |
| Comparative example | Oil quenching at 700 ℃ multiplied by 1h +920 ℃ multiplied by 1h +1020 ℃ multiplied by 3.5h and oil cooling at 680 ℃ multiplied by 10h | Air cooling at 550 ℃ for 48h |
Wherein the temperature rise speed in the heat treatment process is controlled to be 100 +/-20 ℃/h; this can reduce the thermal stress and effectively control the deformation of the sector plate.
Wherein the annealing temperature in the heat treatment process is controlled to be 880-920 ℃; the temperature of the third section of heat preservation in the hardening and tempering is controlled between 1040 and 1060 ℃; the heat preservation time of annealing and tempering is controlled to be 1-4 minutes/mm according to the effective thickness of the sector plate.
The functions of controlling the heat preservation temperature and the heat preservation time are as follows: 1. ensuring that indissolvable alloy elements in the steel are fully dissolved into austenite to form uniform alloying; 2. the austenite grains of the steel are ensured to be uniform without mixed grains, and the purpose of refining the grains is finally achieved; 3. after quenching, 700 ℃ tempering (namely the heat preservation temperature of the fourth section in the quenching and tempering treatment) is adopted, so that carbides in the steel are fully separated out, and the structure stability and the performance meeting the requirements are ensured.
The three examples are sampled to carry out tensile and impact property tests, metallographic structure detection and analysis and cold and hot cycle fatigue tests, and the detection results of the standard mechanical property samples of the 2Cr12NiMoWV sector plate in the three examples and the background technology are shown in Table 3.
TABLE 3 mechanical property test results of hot-rolled coil sector plate (23 deg.C)
| Ballistic work AKV (J) | Tensile strength (MPa) | Yield strength (MPa) | Elongation after Break (%) | Yield on fracture surface (%) | Hardness (HB) | |
| Example 1 | 103.7、106.8、109.1、105.1 | 818 | 624 | 20.5 | 56 | 243-248 |
| Example 2 | 130.8、134.5、143.9、139.6 | 810 | 610 | 21.5 | 58 | 236-239 |
| Example 3 | 113.7、114.5、118.3、113.2 | 816 | 603 | 23.0 | 60 | 242-245 |
| Comparative example | 23.1、22.3、23.5、26.4 | 860 | 622 | 15.5 | 31 | 241-254 |
As can be seen from the above table: the hardness of the sector plate of the embodiment 1 is 243 to 248HB; the hardness of the sector plate of the embodiment 2 is 236 to 239HB, and the hardness of the sector plate of the embodiment 3 is 242 to 245HB; as can be seen from FIG. 1, the structures of the three examples of the invention are all tempered sorbite with retained martensite orientation, and the grain sizes of the sector plates of the three examples are all 10 grades; the room-temperature mechanical properties of the sector plates of the three embodiments are all as follows: the tensile strength is more than or equal to 800MPa; the yield strength is more than or equal to 600MPa; the elongation after fracture is more than or equal to 20 percent; the reduction of area is more than or equal to 50 percent; the impact power AKV is more than or equal to 100J. Therefore, the mechanical property of the steel for the hot-rolled winding drum high-performance sector plate is obviously superior to that of the 2Cr12NiMoWV material in the background technology, so that the service life is prolonged. The online use data of the fan-shaped plate on the mountain steel sunshine 2050 and heavy steel 1780 hot rolling production line show that the online steel passing amount for the first time can reach more than 150 ten thousand tons, the use effect is good, and no fatigue crack exists after flaw detection.
Claims (9)
1. A hot-rolled drum high-performance sector plate comprises the following chemical components in percentage by mass: c:0.16-0.25%, si:0.17-0.55%, mn:0.8-1.2%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, cr:10-12%, ni:1.2-1.5%, mo:1.2-1.6%, V:0.5-0.8%, W:0.3-0.4%, ti:0.25 to 0.35 percent, the balance being Fe, and the Cr + Ni + Mo is more than or equal to 13 percent.
2. The hot rolled drum high performance sector plate of claim 1, wherein: the mass percentages of the chemical components are preferably as follows: c:0.2%, si:0.45%, mn:0.88%, P:0.012%, S:0.008%, cr:11.2%, ni:1.3%, mo:1.3%, V:0.78%, W:0.4%, ti:0.3 percent and the balance of Fe.
3. The hot rolled drum high performance sector plate of claim 1, wherein: the mass percentages of the chemical components are preferably as follows: c:0.18%, si:0.41%, mn:0.95%, P:0.010%, S:0.009%, cr:10.8%, ni:1.25%, mo:1.3%, V:0.65%, W:0.33%, ti:0.25 percent and the balance of Fe.
4. The hot rolled drum high performance sector plate of claim 1, wherein: the mass percentages of the chemical components are preferably as follows: c:0.22%, si:0.4%, mn:1.12%, P:0.014%, S:0.009%, cr:11.7%, ni:1.35%, mo:1.49%, V:0.75%, W:0.36%, ti:0.3 percent and the balance of Fe.
5. The hot rolled coil high performance sector plate of any one of claims 1 to 4, manufactured by a method comprising: forging → annealing → rough machining → tempering → semi-finishing → destressing tempering → finishing.
6. The method of manufacturing a hot rolled coil high performance sector plate of claim 5, wherein the heat treatment process comprises:
(1) And (3) annealing: keeping the temperature of 900 +/-20 ℃, cooling the furnace to below 350 ℃, and then cooling the furnace to room temperature;
(2) Tempering: keeping the temperature at 700 +/-10 ℃, keeping the temperature at 920 +/-10 ℃, keeping the temperature at 1050 +/-10 ℃, cooling the oil to be below 200 ℃, keeping the temperature at 700 +/-10 ℃, and cooling the oil to the room temperature;
(3) Stress relief tempering: and (3) preserving the temperature of the semi-finished fan-shaped plate at 600 ℃ for 48 hours, and cooling the semi-finished fan-shaped plate by air.
7. The method of manufacturing a hot rolled coil high performance sector plate of claim 6, wherein: the temperature rise speed in the heat treatment process is controlled to be 100 +/-20 ℃/h, and the heat preservation time of annealing and tempering is controlled to be 1-4 minutes/mm according to the effective thickness of the sector plate.
8. The method of manufacturing a hot rolled coil high performance sector plate of claim 6, wherein: the grain size of the hot-rolled drum sector plate is more than or equal to grade 9, the hardness after quenching and tempering is 230-250 HB, and the structure is tempered sorbite and a small amount of ferrite.
9. The method of manufacturing a hot rolled coil high performance sector plate of claim 6, wherein: the mechanical properties are as follows: the tensile strength is more than or equal to 800MPa; the yield strength is more than or equal to 600MPa; the elongation after fracture is more than or equal to 20 percent; the reduction of area is more than or equal to 50 percent; the impact power AKV is more than or equal to 100J.
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