CN111647721A - Method for solving low-temperature impact energy of high-alloy structural steel after hardening and tempering - Google Patents
Method for solving low-temperature impact energy of high-alloy structural steel after hardening and tempering Download PDFInfo
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- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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Abstract
The invention relates to a method for solving the problem of low-temperature impact energy of high-alloy structural steel after hardening and tempering, and belongs to the technical field of metallurgy. In order to solve the problem that the low-temperature impact energy of the high-alloy structural steel is lower after quenching and tempering, the invention provides a method for solving the problem that the low-temperature impact energy of the high-alloy structural steel is lower after quenching and tempering, which comprises the quenching and tempering processes of quenching and high-temperature tempering, wherein the high-temperature tempering process comprises the following steps: heating the steel material after quenching and cooling to 590 +/-5 ℃, and keeping the temperature for 8h after temperature equalization; and then cooling the steel material to 50-100 ℃ by water cooling, avoiding the second type of temper brittleness, preventing the low-temperature impact energy caused by the temper brittleness from being low, realizing the qualification of the low-temperature impact energy of the high-alloy structural steel at-40 ℃, shortening the delivery cycle of the product and preventing the internal loss of the steel material.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for solving the problem that low-temperature impact energy of high-alloy structural steel is low after hardening and tempering.
Background
The high alloy structural steel refers to the alloy structural steel with the total content of alloy elements of more than 10%, and various special properties can be obtained by adding larger content of the alloy elements, wherein the corrosion resistance, the heat resistance and the oxidation resistance under high temperature and the high toughness under low temperature of different mediums are particularly improved.
The low-temperature impact energy is the capability of the material for resisting impact at low temperature, and reflects the toughness of the material at a certain temperature. Generally, the lower the temperature, the slower the molecular motion of the material, the relatively small intermolecular forces, and the reduced elasticity. Therefore, the lower temperature of the material still has higher low-temperature impact energy, which indicates that the material has good toughness and can be applied in more applications in low-temperature environments.
The low-temperature impact energy result of the high-alloy structural steel after quenching and tempering is usually low, and the low-temperature impact energy index requirement at the temperature of minus 40 ℃ cannot be met by quenching and tempering for multiple times or tempering for multiple times, so that the application of the high-alloy structural steel in a low-temperature environment is limited, and the delivery period and the production cost are influenced.
Disclosure of Invention
The invention provides a method for solving the problem that the low-temperature impact energy of high-alloy structural steel is low after hardening and tempering, and aims to solve the problem that the low-temperature impact energy of the high-alloy structural steel is low after hardening and tempering.
The technical scheme of the invention is as follows:
a method for solving the problem that low-temperature impact energy is low after high-alloy structural steel is quenched and tempered comprises quenching and tempering processes of quenching and high-temperature tempering, wherein the high-temperature tempering process comprises the following steps: heating the steel material after quenching and cooling to 590 +/-5 ℃, and keeping the temperature for 8h after temperature equalization; and then cooling the steel material to 50-100 ℃ by adopting water cooling.
Furthermore, the temperature of water used for water cooling is controlled to be 15-18 ℃.
Further, the high-temperature tempering adopts a warm charging furnace.
Further, the quenching process comprises the following steps: heating the steel material to 650 +/-10 ℃, and preserving heat for 4 hours; heating to 930 +/-10 ℃ at a first heating rate, and keeping the temperature for 2 hours after temperature equalization; heating to 950 +/-10 ℃ at a second heating rate, and keeping the temperature for 2 hours after temperature equalization; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
Further, the first temperature increase rate is controlled to be 60 ℃/h or less.
Further, the second temperature increase rate is controlled to 80 ℃/h or less.
Further, the high-alloy structural steel comprises the following chemical components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
The invention has the beneficial effects that:
the method for solving the problem that the low-temperature impact power of the high-alloy structural steel is low after tempering mainly controls the working procedure in the tempering process, the tempering temperature is controlled at 590 ℃, the cooling mode after tempering replaces air cooling with water cooling, the water cooling water temperature is controlled at 15-18 ℃, the steel after tempering is cooled to 50-100 ℃ with water, the second type of tempering brittleness is avoided, the low-temperature impact power caused by the tempering brittleness is prevented from being low, the qualification of the low-temperature impact power of the high-alloy structural steel at minus 40 ℃ is realized, the product delivery cycle is shortened, and the internal loss of the steel is prevented.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention. In the following examples, the processing equipment or apparatus not specifically mentioned is conventional in the art, and the technical means not specifically mentioned is conventional means well known to those skilled in the art.
Example 1
The chemical components of the high-alloy structural steel in the embodiment comprise the following components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
The production flow of the high alloy structural steel in the embodiment is as follows: electric furnace smelting + LF refining + VD vacuum refining → casting steel ingot → rolling electrode blank 220 x 220mm → heat transfer annealing → coping → electroslag remelting → electroslag ingot heat transfer annealing → heating, forging → annealing → one-time rough adding → fault detection → drilling → secondary rough adding → fault detection → tempering → straightening → inspection, inspection → fault detection → upward.
Smelting a high-alloy structural steel in an electric furnace:
1. in order to reduce the content of harmful elements as much as possible, the raw materials are required to be more than or equal to 30 percent of pig iron.
2. The electric furnace is charged more, and the residual molten steel amount in the furnace is ensured to be more than 6 tons, so that the slag is not discharged during tapping.
3. Sampling in a furnace, and tapping after the P is processed by the reconstructed primary slag with the P content less than or equal to 0.003%.
4. 1-2 bags of carbon powder are added into the furnace before tapping, so that slag is foamed and sticky, and the amount of discharged steel strip slag is reduced.
5. The tapping temperature is more than or equal to 1580 ℃, and the tapping [ P ] is less than or equal to 0.003 percent.
6. 300-400 Kg of lime and 50-100 Kg of fluorite are added in the tapping process, and no alloy is added.
LF refining:
1. and (3) heating to a refining position for slagging, not deoxidizing, pouring slag after the slag is molten, and then slagging again. The new slag comprises the following target components: CaO: 52% -58%, SiO 2: 6% -10%, MgO: less than or equal to 8 percent, Al2O 3: 20 to 25 percent.
2. And after re-slagging, feeding an Al wire according to 4 m/t of ton steel, adding Al, ferrosilicon powder and carbon powder in batches according to the slag condition to whiten the slag, carrying out no mixing on other components except Si before whitening the slag, and carrying out sampling total analysis after whitening the slag and then adjusting the alloy.
3. The refining time under the white slag is more than or equal to 20 minutes.
VD vacuum:
1. before vacuum, S is less than or equal to 0.005 percent, the temperature of molten steel is more than or equal to 1620 ℃, and before vacuum, the ratio of [ Al ]: feeding 0.040% -0.050% of aluminum wires; and starting the vacuum pump step by step after the vacuum is empty, wherein the holding time is more than or equal to 20 minutes when the vacuum degree reaches 67 Pa.
2. After the diffusion, the argon is adjusted, and the soft argon blowing time is more than or equal to 15 minutes, based on the condition that the slag surface is slightly moved and the molten steel is not exposed. The mold temperature is 30-80 ℃.
Pouring: the pouring time of the ingot body is more than or equal to 240S, and the pouring time of the cap opening is more than or equal to 90S
Rolling the electrode blank:
and heating the steel ingot to 1290 ℃, and keeping the temperature for 2 hours for rolling. Rolled gauge 220 x 220 square, length 7.5 meters. Annealing by hot feeding after rolling, wherein the annealing process comprises the following steps: keeping the temperature of 350-400 ℃ for 10h, heating to 670 +/-10 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for (10+ Q/4) h, wherein Q is the charging amount; cooling to 300 ℃ at a cooling speed of less than or equal to 50 ℃/h, discharging and air cooling.
Steel billet coping:
the billet must be ground and cleaned by a billet grinding machine, the aim of removing surface iron oxide scales is only to control the grinding amount, the surface of the billet is ensured not to be dark blue, the billet is qualified after inspection, and the billet is transferred to electroslag remelting after being weighed one by one.
Electroslag remelting:
1. the surface of the electrode blank is not allowed to have the defects of scabs, iron scales, inclusions (slag) and the like.
2. Introducing argon gas before arc ignition and evacuating, wherein the argon gas is used for protection in the smelting process; the crystallizer used for electroslag smelting has to be good and has no water leakage phenomenon. The stability of current and exchange electrode is kept in the remelting process, and the defects of surface slag channel and the like are reduced.
3. The electrical system and feeding system are shown in Table 1.
TABLE 1
4. The slag system and the time system are shown in Table 2.
TABLE 2
Annealing of electroslag ingots:
the heat treatment furnace is ignited half an hour in advance and is organized to be charged in time. The annealing process of the electroslag ingot comprises the following steps: keeping the temperature of 350-400 ℃ for 10h, heating to 670 +/-10 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for (20+ Q/4) h, wherein Q is the charging amount; cooling to 150 ℃ at a cooling speed of less than or equal to 30 ℃/h, discharging and air cooling.
Forging and heat treatment:
1. the electroslag ingot forging heating process comprises the following steps: heating to 600-650 ℃ at a heating rate of less than or equal to 80 ℃/h, preserving heat for 5h, heating to 800-850 ℃ at a heating rate of less than or equal to 100 ℃/h, preserving heat for 3h, continuously heating to 1220-1240 ℃ at a heating rate of less than or equal to 100 ℃/h, preserving heat for 10h, and then starting forging.
Forging process of the forge piece: in order to ensure the mechanical property, a upsetting and then stretching forging process is adopted, the upsetting ratio of electroslag ingots is 1.5, the intermediate blank is subjected to large pressing amount and quick forging operation in the stretching process during the production of a hydraulic press, and the small pressing amount finish operation is carried out after the residual amount of a finished product is 60 mm. Under the condition that finished products cannot be produced in one fire, the temperature of the furnace returning and heating furnace is kept at 1190 +/-10 ℃ for 0.5-1.5 hours, and the finished products are discharged and forged; the final forging temperature is controlled to be 850-750 ℃. The surface of the forged blank is air-cooled to 600-650 ℃ and then is placed into an annealing furnace.
Forging annealing process of the forge piece:
keeping the temperature of 500-700 ℃ for 5-8 h, heating to 910 +/-10 ℃ at a speed of less than or equal to 80 ℃/h, keeping the temperature for 8-9 h after temperature equalization, air-cooling to 280-320 ℃ for 11-13 h, heating to 670 +/-10 ℃ for 100h after temperature equalization, cooling to 400 ℃ at a speed of less than or equal to 30 ℃/h, and then cooling to below 150 ℃ at a speed of less than or equal to 15 ℃/h.
When the black skin is normalized, the black skin is required to be hung down for dispersion and air cooling; the longer forging piece is subjected to final heat treatment, so that the clamping stress is reduced as much as possible, and the flatness after quenching and tempering is ensured; the forging piece has high required performance uniformity, and good furnace conditions are effectively guaranteed.
Coarse addition:
the method comprises the following steps of primary roughing, drilling processing, wall thickness difference measurement, secondary reaming and wall thickness difference measurement after secondary roughing being less than or equal to 2 mm.
Quenching and tempering heat treatment:
1. and (3) normalizing process: heating to 910 +/-10 ℃ for temperature equalization and keeping the temperature for 3 hours, and cooling in air to below 250 ℃;
2. the method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel comprises the following quenching and tempering processes:
quenching process: heating the steel material to 650 ℃, and preserving heat for 4 hours; heating to 930 ℃ at a heating rate of 60 ℃/h, keeping the temperature for 2h after temperature equalization; heating to 950 ℃ at a heating rate of 80 ℃/h, and keeping the temperature for 2h after temperature equalization; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
And (3) high-temperature tempering process: heating the quenched and cooled steel material to 590 ℃ by using a warm charging furnace, and keeping the temperature for 8 hours after temperature equalization; and then cooling by water cooling, wherein the temperature of water for water cooling is controlled to be 15-18 ℃, the cooling time is about 3min, and the steel material is cooled to 50 ℃.
3. A straightening and preheating process: heating to 550 +/-10 ℃, preserving the temperature for 10 hours, and then transferring and straightening;
4. the heat elimination treatment process comprises the following steps: keeping the temperature at 300-350 ℃ for 3h, heating to 550 +/-10 ℃ and keeping the temperature for 14 h, and cooling with water for 3 min.
Example 2
The chemical components of the high-alloy structural steel in the embodiment comprise the following components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
The production flow of the high alloy structural steel in the embodiment is as follows: electric furnace smelting + LF refining + VD vacuum refining → casting steel ingot → rolling electrode blank 220 x 220mm → heat transfer annealing → coping → electroslag remelting → electroslag ingot heat transfer annealing → heating, forging → annealing → one-time rough adding → fault detection → drilling → secondary rough adding → fault detection → tempering → straightening, eliminating → inspection, inspection → fault detection → upward.
The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel comprises the following quenching and tempering processes of quenching and high-temperature tempering:
quenching process: heating the steel material to 640 ℃, and preserving heat for 4 hours; heating to 920 ℃ at the heating rate of 55 ℃/h, keeping the temperature for 2h after temperature equalization; heating to 940 ℃ at the heating rate of 75 ℃/h, keeping the temperature for 2h after temperature equalization; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
And (3) high-temperature tempering process: heating the steel material after quenching to 585 ℃ by using a warm charging furnace, and keeping the temperature for 8 hours after temperature equalization; and then cooling by water cooling, wherein the water temperature of the water cooling is controlled to be 15-18 ℃, the cooling time is about 3min, and the steel material is cooled to 60 ℃.
Example 3
The chemical components of the high-alloy structural steel in the embodiment comprise the following components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
The production flow of the high alloy structural steel in the embodiment is as follows: electric furnace smelting + LF refining + VD vacuum refining → casting steel ingot → rolling electrode blank 220 x 220mm → heat transfer annealing → coping → electroslag remelting → electroslag ingot heat transfer annealing → heating, forging → annealing → one-time rough adding → fault detection → drilling → secondary rough adding → fault detection → tempering → straightening, eliminating → inspection, inspection → fault detection → upward.
The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel comprises the following quenching and tempering processes of quenching and high-temperature tempering:
quenching process: heating the steel material to 660 ℃, and preserving heat for 4 hours; heating to 940 ℃ at the heating rate of 50 ℃/h, keeping the temperature for 2h after temperature equalization; heating to 960 deg.C at a heating rate of 70 deg.C/h, homogenizing, and maintaining for 2 h; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
And (3) high-temperature tempering process: heating the steel material after quenching to 595 ℃ by using a temperature charging furnace, and keeping the temperature for 8h after temperature equalization; and then cooling by water cooling, wherein the water temperature of the water cooling is controlled to be 15-18 ℃, the cooling time is about 3min, and the steel material is cooled to 80 ℃.
Example 4
The chemical components of the high-alloy structural steel in the embodiment comprise the following components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
The production flow of the high alloy structural steel in the embodiment is as follows: electric furnace smelting + LF refining + VD vacuum refining → casting steel ingot → rolling electrode blank 220 x 220mm → heat transfer annealing → coping → electroslag remelting → electroslag ingot heat transfer annealing → heating, forging → annealing → one-time rough adding → fault detection → drilling → secondary rough adding → fault detection → tempering → straightening, eliminating → inspection, inspection → fault detection → upward.
The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel comprises the following quenching and tempering processes of quenching and high-temperature tempering:
quenching process: heating the steel material to 655 ℃, and preserving heat for 4 hours; heating to 935 ℃ at the heating rate of 50 ℃/h, keeping the temperature for 2h after temperature equalization; heating to 955 ℃ at the heating rate of 60 ℃/h, keeping the temperature for 2h after temperature equalization; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
And (3) high-temperature tempering process: heating the quenched and cooled steel material to 590 ℃ by using a warm charging furnace, and keeping the temperature for 8 hours after temperature equalization; and then cooling by water cooling, wherein the water temperature of the water cooling is controlled to be 15-18 ℃, the cooling time is about 3min, and the steel material is cooled to 100 ℃.
Comparative example 1
The difference between the comparative example and the example 1 is that the high-temperature tempering process of the comparative example adopts air cooling to reduce the temperature, and the cooling time is 3 hours to cool the steel to 50 ℃.
Comparative example 2
The difference between the comparative example and the example 2 is that the high-temperature tempering process of the comparative example adopts air cooling for cooling, the cooling time is 3 hours, the steel is cooled to 60 ℃,
the high alloy structural steels obtained in examples 1 and 2 and comparative examples 1 and 2 were examined for the prescribed elongation stress, tensile strength, elongation, shrinkage and low-temperature impact work, and the results are shown in table 3.
TABLE 3
As can be seen from the comparison of the data in Table 3, the specified elongation stress, tensile strength, elongation, shrinkage and low-temperature impact energy obtained by the quenching and tempering methods provided in examples 1 and 2 are better than those of comparative examples 1 and 2, which shows that the high-alloy structural steels produced by the quenching and tempering methods of examples 1 and 2 have more excellent toughness under low-temperature conditions.
The tempering method provided by the invention avoids the second type of temper brittleness through controlling the tempering temperature and the cooling mode after tempering, prevents the low-temperature impact energy caused by air cooling temper brittleness from being lower, realizes the qualification of the low-temperature impact energy of the high-alloy structural steel at-40 ℃, shortens the delivery cycle of products, and prevents the internal loss of steel products.
Claims (7)
1. A method for solving the problem that the low-temperature impact energy of high-alloy structural steel after quenching and tempering is lower comprises quenching and tempering processes of high-temperature tempering, and is characterized in that the high-temperature tempering process comprises the following steps: heating the steel material after quenching and cooling to 590 +/-5 ℃, and keeping the temperature for 8h after temperature equalization; and then cooling the steel material to 50-100 ℃ by adopting water cooling.
2. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel as recited in claim 1, wherein the temperature of water used for water cooling is controlled to be 15-18 ℃.
3. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel as recited in claim 2, wherein the high-temperature tempering is performed by using a warm charging furnace.
4. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel according to claim 3, wherein the quenching process comprises the following steps: heating the steel material to 650 +/-10 ℃, and preserving heat for 4 hours; heating to 930 +/-10 ℃ at a first heating rate, and keeping the temperature for 2 hours after temperature equalization; heating to 950 +/-10 ℃ at a second heating rate, and keeping the temperature for 2 hours after temperature equalization; and (3) discharging from the furnace for quenching, wherein the quenching medium is water, the cooling medium is 20# mechanical oil, and the cooling is carried out to 50-100 ℃ for 0.5 h.
5. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel as recited in claim 4, wherein the first temperature rise rate is controlled to be less than 60 ℃/h.
6. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel as recited in claim 5, wherein the second temperature rise rate is controlled to be less than 80 ℃/h.
7. The method for solving the problem of low-temperature impact energy of the quenched and tempered high-alloy structural steel according to claim 6, wherein the high-alloy structural steel comprises the following chemical components in percentage by weight: 0.45 to 0.50 percent of C, 0.40 to 0.50 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.00 to 2.50 percent of Cr, 4.00 to 4.50 percent of Ni, 1.55 to 1.60 percent of Mo, 0.15 to 0.20 percent of V, 0.50 to 0.60 percent of W, less than or equal to 0.060 percent of Cu, less than or equal to 0.030 percent of Al, and the balance of Fe and inevitable impurities.
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Application publication date: 20200911 |