CN115323143B - A method for preparing 10Ni3MnCuAl plastic mold flat steel - Google Patents
A method for preparing 10Ni3MnCuAl plastic mold flat steel Download PDFInfo
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- B22D11/111—Treating the molten metal by using protecting powders
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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Abstract
本发明公开一种10Ni3MnCuAl塑料模具扁钢制备方法，采用连铸大圆坯+在线空冷固溶工艺，解决模铸极易造成二次氧化形成、连铸板坯因板坯规格受限，加工比偏小极易造成中心疏松缺陷、“离线固溶”轧后需重新加热升温后冷却固溶，增加一次加热升温过程、“在线快冷固溶”因固溶冷却速度较快、应力较大，易导致弯曲和应力裂纹缺陷的问题。本发明优点主要在于：⑴连铸大圆坯生产，与模铸相比，防止钢液二次氧化，提高纯净度；生产相同规格的扁钢，提高了加工比，内部组织更致密，探伤质量更高，可生产的规格范围远超连铸板坯；⑵采用“在线空冷固溶”冷速较慢、应力较小，钢材不容易炸裂，且带温矫直，更易操作，提高效率降低成本。
The present invention discloses a method for preparing 10Ni3MnCuAl plastic mold flat steel, which adopts continuous casting of large round billets + online air cooling solid solution process to solve the problems that die casting is very likely to cause secondary oxidation, continuous casting slabs are very likely to cause central loose defects due to limited slab specifications and small processing ratios, "offline solid solution" needs to be reheated and heated after rolling and then cooled for solid solution, which adds a heating and heating process, and "online fast cooling solid solution" is easy to cause bending and stress crack defects due to fast solid solution cooling speed and large stress. The advantages of the present invention are mainly: (1) Compared with die casting, continuous casting of large round billets can prevent secondary oxidation of molten steel and improve purity; the production of flat steel of the same specifications improves the processing ratio, the internal structure is denser, the flaw detection quality is higher, and the specification range that can be produced far exceeds that of continuous casting slabs; (2) "online air cooling solid solution" has a slow cooling speed and small stress, so the steel is not easy to burst, and it is easier to operate with temperature straightening, which improves efficiency and reduces costs.
Description
Technical Field
The invention belongs to the technical field of plastic die steel, and particularly relates to a manufacturing method of 10Ni3MnCuAl plastic die flat steel.
Background
10Ni3MnCuAl belongs to aging precipitation hardening steel, and is widely used in transparent plastic product molds of automobiles, household appliances, cameras, computers, telephones and the like by aging precipitation of nanoscale intermetallic compound Al 3 Ni and copper-rich phase dispersion strengthening to improve hardness, so that the polishing requirements are high, and electroslag steel is generally adopted. However, with the continuous development of the mold material industry, low-cost materials are sought, refined steel is gradually adopted, die casting or continuous casting slab production is generally adopted at home and abroad, secondary oxidation is extremely easy to form inclusion during die casting due to high aluminum content of the steel, polishing performance is affected, flaw detection is not suitable and scrapped due to severe defects, die casting automation degree is low, ingot forming rate is low, cost is high, continuous casting slabs (slab thickness for domestic production of the variety is generally less than 450 mm) are limited due to slab specification, processing ratio is small, center loosening defect is extremely easy to cause, quality is affected, and production specification range is limited. The steel is typically delivered in a pre-hardened state and can be directly processed into a mold for use by a user without thermal care. The online quick-cooling solid solution process is characterized in that the quick-cooling solid solution process is generally used for carrying out off-line solid solution or online quick-cooling solid solution and aging pre-hardening process, wherein the offline solid solution process is carried out after rolling and needs to be reheated and heated, then cooling and solid solution are carried out, a heating and heating process is added, energy is wasted, cost and period are increased, bending and stress crack defects are easily caused due to high quick-cooling solid solution cooling speed and high stress, the Hardness (HRC) after solid solution is generally 32-36, the aging pre-hardening process (HRC) is generally increased to 38-42, therefore, the straightening after bending of the steel is generally carried out after solid solution and before aging pre-hardening, but the straightening is difficult and easy to crack due to high residual tissue stress and thermal stress exist in quick-cooling solid solution, and one step of stress tempering is added after straightening, so that in order to prevent straightening crack, the steel mill chooses to carry out straightening and crack after aging pre-hardening, the strain and crack are prevented, and the production cost is increased.
Disclosure of Invention
The invention discloses a manufacturing method of 10Ni3MnCuAl plastic die flat steel, which adopts a continuous casting large round billet and an online air cooling solid solution process to solve the problems.
The process route is as follows:
Molten iron-converter-LF-RH-continuous casting of round billets with phi 600mm or phi 700mm, red-package heating and rolling of flat billets, slow cooling-heating and rolling of flat steel, on-line air cooling and solid solution, hot straightening-aging and pre-hardening-inspection and warehousing.
The specific process steps are as follows:
⑴ And (3) converter smelting, namely adding molten iron and ferronickel alloy, controlling the tapping carbon to be 0.05% -0.10%, the tapping phosphorus to be not more than 009%, and the tapping nickel to be 2% -2.5%.
⑵ LF refining, namely adding 1000 kg-1200 kg of lime and 400 kg-500 kg of refining slag to perform slag making, deoxidizing by adopting calcium carbide or aluminum beans, ensuring that sulfur is not more than 0.005% before aluminum alloying, and adjusting the rest components to ensure that the components meet 0.14% -0.18% of carbon, 0.20% -0.30% of silicon, 1.45% -1.55% of manganese, not more than 0.015% of phosphorus, not more than 0.005% of sulfur, 3.00% -3.10% of nickel, 0.90% -1.0% of aluminum, 0.20% -0.25% of molybdenum and 0.85% -0.90% of copper.
⑶ RH vacuum treatment, wherein the ultimate vacuum degree is not more than 67Pa, the holding time is not less than 20min, and the tapping hydrogen is not more than 1.5X10 -6.
⑷ The method comprises the steps of continuously casting phi 600mm or phi 700mm round billets, adopting special high-aluminum steel casting powder, wherein the casting powder comprises 2% -5% of SiO 2：33％～43％,CaO：14％～24％,Al2O3, 9% -15% of solid carbon (TC), not more than 4% of Fe 2O3, not more than 4% of MgO, 5% -12% of fluorine, not more than 0.5% of R 2O(Li2O+Na2O+K2 O, 0.35% -0.65% of alkalinity, 940-960 ℃ of melting point, 0.25-0.55 Pa & s of viscosity, introducing argon into a tundish at least 5min before casting, removing air from the tundish, introducing the ladle molten steel into the tundish through a long water gap during casting, then immediately adding carbonized rice husk covering agent, stopping introducing argon, finally enabling the molten steel in the ladle to enter the tundish with the carbonized rice husk covering agent attached thereon through a long water gap to isolate air, and then pulling out the continuous casting billets, and preventing secondary oxidation.
① The technological parameters of the continuous casting 600 circles include that the temperature of a tundish is 1531-1541 ℃, the casting superheat degree is 25-45 ℃, the pulling speed is 0.265 m/min+/-0.010 m/min, the crystallizer water is 3800L/min-4200L/min, the electromagnetic stirring of the crystallizer is carried out at the current 240A-260A, the frequency is 1.4 HZ-1.6 HZ, the continuous stirring is carried out, the electromagnetic stirring at the tail end is 440A-460A, the frequency is 4.3 HZ-4.7 HZ, and the alternating time is 25s-5s;
② The technological parameters of continuous casting 700 circles include a tundish temperature of 1528-1539 ℃, a casting superheat degree of 25-45 ℃, a pulling speed of 0.170 m/min+/-0.010 m/min, crystallizer water of 4600L/min-5000L/min, electromagnetic stirring of the crystallizer, current 140A-160A, frequency of 1.4 HZ-1.6 HZ, continuous stirring, electromagnetic stirring of the tail end, current 440A-460A, frequency of 4.3 HZ-4.7 HZ and alternating time of 25s-5s-25s-5s.
⑸ And (3) heating and rolling the flat blank, namely, red feeding the round blank into a furnace, heating to a material temperature of 1140-1160 ℃ at a temperature of not more than 80 ℃ per hour, keeping the temperature of 600 circles for not less than 4 hours, keeping the temperature of 700 circles for not less than 6 hours, reducing the rolling quantity of at least 2 times to be not less than 50mm, controlling the total processing ratio of the cogging to be not less than 2, ensuring internal compaction, feeding the round blank offline into a pit for slow cooling after rolling, and discharging the round blank from the pit for cleaning the surface defects of the blank after slow cooling to below 200 ℃.
⑹ And (3) heating and rolling the flat steel, namely performing thorough heating on the flat steel in a preheating section at 800-900 ℃, uniformly and thoroughly heating the flat steel in a heating section at 1050-1100 ℃, entering a soaking section, controlling the temperature of the soaking section in a range of 1120-1140 ℃, keeping the soaking section for 20-40 min, controlling the reduction of at least 2 passes to be not less than 20mm, controlling the total processing ratio of the blank to the material to be not less than 1.5, and ensuring the compactness of the core.
⑺ And (3) on-line air cooling and solid solution, namely accurately controlling the final rolling temperature to 830-870 ℃, preventing the coarse grains with higher temperature and the low temperature from influencing the on-line solid solution effect, and performing dispersed air cooling to 300-400 ℃ after rolling to straighten.
⑻ Straightening at the temperature of 200-400 ℃ so that straightening is easier, cracking is not easy, and air cooling is performed after straightening.
⑼ Tempering the straightened flat steel within 24 hours, on one hand, aging precipitation hardening, on the other hand, eliminating stress, preventing stress explosion caused by untimely tempering for too long, tempering and heat preservation at 525-545 ℃ and keeping for 12-16 hours, and discharging the flat steel from the furnace for air cooling.
The mechanism analysis and the invention are as follows:
The refining rolling flat steel of 10Ni3MnCuAl produced at home and abroad generally adopts a die cast ingot or a continuous casting slab, wherein the die cast ingot is adopted for production, and because the steel contains higher aluminum, secondary oxidation is extremely easy to form inclusion during die casting, the polishing performance is affected, flaw detection is not good and the steel is scrapped when serious, and the die casting operation has low automation degree, low ingot forming rate and high cost. The continuous casting slab is adopted for production, and because the production is limited by slab specifications, the machining ratio is smaller, the quality is affected by center loosening defects easily generated, and the production specifications are limited. The steel is delivered in a pre-hardening state, and is pre-hardened by adopting ' off-line solid solution ' or ' on-line quick-cooling solid solution ' +aging pre-hardening ' at home and abroad, wherein the off-line solid solution cost is high, and the on-line quick-cooling solid solution has the risks of difficult straightening or straightening burst. According to the continuous casting round billet and on-line air cooling solid solution production process, argon gas, a long water gap and a covering agent are introduced in advance through a continuous casting tundish to ensure that molten steel is isolated from air, secondary oxidation is prevented, and on the basis of a continuous casting principle, reasonable parameters such as slag system, drawing speed, superheat degree, crystallizer water quantity, electromagnetic stirring of the crystallizer, electromagnetic stirring of the tail end and the like are selected in the continuous casting process, so that the internal quality of the large continuous casting round billet is ensured, the processing ratio is improved by increasing the sectional area of the continuous casting billet, the steel center is more compact, the degree of automation and the blank forming rate are improved, the production cost is reduced, and the production specification range is expanded. Through the hot straightening of area after the online air cooling solid solution, reduce cooling rate, reduce structure and thermal stress, make flat steel straighten easier, and reduce the straightening and explode the crack risk, save an off-line heating process, improve production efficiency, reduction in production cost.
Compared with the prior art, the invention has the main advantages that:
⑴ Compared with die casting, the continuous casting large round billet production can better prevent secondary oxidation of molten steel, improve purity, further improve flaw detection level and polishing property, and has higher automation degree, higher billet forming rate and greatly reduced production cost;
⑵ Compared with continuous casting slabs, the continuous casting round slab is adopted to produce flat steel with the same specification, the processing ratio is improved, the internal structure of a finished product is more compact, the center loosening quality is better, the flaw detection quality is higher, the polishing performance is better, and the producible specification range is far more than that of the continuous casting slabs;
⑶ The steel is not easy to crack due to slower cooling speed and smaller stress by adopting the online air cooling solid solution process, and the steel is easier to straighten by straightening at a temperature, so that the production cost is greatly reduced while the efficiency is improved.
Drawings
FIG. 1 is a 10Ni3MnCuAl low-power picture with the specification of 121mmx560mm, wherein the center is loose by 0.5 level, and the flaw detection meets the E/E level in SP 1921;
FIG. 2 is a drawing of a 10Ni3MnCuAl low-power picture with the specification of 141mmx610mm produced by the invention, wherein the center is loose by 1.0 grade, and the flaw detection meets the E/E grade in SP 1921.
Detailed Description
The invention is described and illustrated in detail below with reference to the accompanying drawings and examples.
Example 1
⑴ Process route
Molten iron-converter-LF-RH-continuous casting 600 round-red package heating rolling flat blank-slow cooling-heating rolling flat steel-on-line air cooling solid solution-hot straightening-aging pre-hardening-checking and warehousing.
⑵ Process steps
① Smelting in a converter, namely smelting in a 110-ton top-bottom combined blown converter, charging 27 tons of nickel and iron with the content of 8% -10%, adding molten iron, blowing, melting, tapping carbon with the content of 0.06%, tapping phosphorus with the content of 0.009%, tapping nickel with the content of 2.2%, and adding 90kg of aluminum blocks for deoxidization after tapping.
② LF refining, namely adding 1060kg lime and 430kg refining slag to perform slag formation after molten steel arrives at a station, deoxidizing by adopting calcium carbide and aluminum beans, alloying elements except aluminum, removing sulfur to 0.003%, performing aluminum alloying, keeping the total time of white slag for 42min, and hoisting and packing to analyze the components before RH, namely, 0.16% of carbon, 0.23% of silicon, 1.48% of manganese, 0.011% of phosphorus, 0.004% of sulfur, 3.03% of nickel, 0.92% of aluminum, 0.22% of molybdenum and 0.86% of copper.
③ RH vacuum treatment, namely RH vacuumizing to the limit vacuum degree of 18Pa, maintaining for 21min, and determining hydrogen after breaking the air, wherein the hydrogen is 1.2 multiplied by 10 -6.
④ Introducing argon into a tundish 7min before casting, using high-aluminum steel casting powder, wherein the water content of the casting powder is 0.2%, the alkalinity is 0.45, the melting point is 955 ℃, the viscosity is 0.35 Pa.s, and when casting, pouring ladle molten steel into the tundish through a long water gap, immediately adding carbonized rice hull covering agent, and stopping introducing argon;
The remaining parameters are shown in Table 1.
Table 1 technological parameters of continuous casting 600 circles
⑤ And (3) heating and rolling the flat blank, namely, red feeding the round blank to a furnace temperature 653 ℃, heating to a material temperature 1153 ℃ at 68 ℃ per hour, keeping the temperature for 4.5 hours, wherein the first and second pass reduction amounts are 52mm and 55mm respectively, the cogging specification is 240mmx570mm, the cogging total processing ratio is 2.1, and after rolling, feeding the round blank into a pit for slow cooling, and slowly cooling to 176 ℃ and discharging the round blank from the pit for cleaning the surface defects of the blank.
⑥ And (3) heating and rolling the flat steel, namely performing thorough burning and heating on the flat steel in a preheating section at 813 ℃, uniformly heating at 1068 ℃, and then entering a soaking section at 1138 ℃ after uniform penetration, wherein the retention time of the soaking section is 38min, the rolling reduction of the 2 nd and 3 rd passes is respectively 22mm and 25mm, the specification of a finished flat steel product is 121mmx560mm, and the processing ratio of the blank to the material is 2.02.
⑦ And (3) carrying out on-line air cooling and solid solution, namely immediately lifting out dispersed air cooling after rolling at the final rolling temperature of 846 ℃, and carrying out air cooling to 396 ℃ until straightening.
⑧ Straightening at the temperature of 283 ℃, and dispersing and placing for air cooling after straightening.
⑨ Ageing and pre-hardening, namely charging into a furnace for tempering treatment after straightening for 13.5 hours, wherein the tempering heat preservation temperature is 540 ℃, and keeping the temperature for 14 hours and discharging for air cooling.
⑩ The inspection shows that the flaw detection meets the E/E grade in the SEP1921 standard, specifically shown in figure 1, the hardness of the side part (HRC) of the cross section is 40.8, the hardness of the quarter part (HRC) of the diagonal line is 39.8, the hardness of the core part (HRC) is 38.6, the requirement of the Hardness (HRC) in the range of 38-42 is met, and the purity is shown in Table 2.
TABLE 2 purity degree
Example 2
⑴ Process route
Molten iron-converter-LF-RH-continuous casting 700 round-red package heating and rolling of flat billets-slow cooling-heating and rolling of flat steels-on-line air cooling solid solution-hot straightening-aging pre-hardening-inspection and warehousing.
⑵ Process steps
① Smelting in a converter, namely smelting in a 110-ton top-bottom combined blown converter, charging 26 tons of nickel and iron with the content of 8% -10%, adding molten iron, blowing, melting, tapping carbon with the content of 0.05%, tapping phosphorus with the content of 0.008%, tapping nickel with the content of 2.02%, and adding 116kg of aluminum blocks for deoxidization after tapping.
② LF refining, namely adding 1083kg lime and 453kg refining slag to slag after molten steel arrives at a station, deoxidizing by adopting calcium carbide and aluminum beans, alloying elements except aluminum, removing sulfur to 0.004%, performing aluminum alloying, and keeping the total time of white slag for 46min, wherein the analysis components before hoisting and packing RH are 0.15% of carbon, 0.26% of silicon, 1.51% of manganese, 0.009% of phosphorus, 0.003% of sulfur, 3.02% of nickel, 0.94% of aluminum, 0.25% of molybdenum and 0.88% of copper.
③ RH vacuum treatment, namely RH vacuumizing to the limit vacuum degree of 16Pa, maintaining for 20min, and determining hydrogen after breaking the air, wherein the hydrogen is 1.3X10 -6.
④ The continuous casting 700 round billet is characterized in that argon is introduced into a tundish 8min before casting, high-aluminum steel casting powder is used, the moisture content of the casting powder is SiO2：40.1％,CaO：20.2％,Al2O3:3.1％,TC：11.2％,Fe2O3：3.1％,MgO：3.1％,F：10.4％,R2O(Li2O+Na2O+K2O)：7.3％,, the alkalinity is 0.50, the melting point is 963 ℃, the viscosity is 0.33 Pa.s, a ladle of molten steel enters the tundish through a long water gap during casting, a carbonized rice hull covering agent is immediately added, then argon is stopped, the molten steel in the ladle finally enters the tundish with the carbonized rice hull covering agent attached on the tundish through the long water gap to isolate air after a series of operations, a continuous casting billet is pulled out to prevent secondary oxidation, and the rest parameters are shown in Table 3.
Table 3 parameters of the continuous casting 700 round process
⑤ And (3) heating and rolling the flat blank, namely, red feeding the round blank into a furnace, heating to a material temperature of 1149 ℃ at 73 ℃ per hour, and keeping the temperature for 6.5 hours, wherein the first and second pass reduction amounts are respectively 51mm and 53mm, the cogging specification is 230mmx620mm, the cogging total processing ratio is 2.7, and the rolled round blank is taken off the line, fed into a pit and cooled slowly, cooled slowly to 188 ℃ and taken out of the pit to clean the surface defect of the blank.
⑥ And (3) heating and rolling the flat steel, namely performing thorough burning and heating on the flat steel in a preheating section at 822 ℃, wherein the temperature of the heating section is 1058 ℃, and after uniform penetration, the flat steel enters a soaking section, the temperature of the soaking section is 1135 ℃, the residence time of the soaking section is 40min, the rolling reduction of the 2 nd and 3 rd passes is 21mm and 26mm respectively, the specification of a finished flat steel product is 141mmx610mm, and the processing ratio of the blank to the material is 1.66.
⑦ And (3) carrying out on-line air cooling and solid solution, namely immediately lifting out dispersed air cooling after rolling at the finish rolling temperature of 866 ℃, and carrying out air cooling to 385 ℃ until straightening.
⑧ Straightening at the temperature of 316 ℃, and dispersing and placing for air cooling after straightening.
⑨ Ageing and pre-hardening, namely charging into a furnace for 17 hours after straightening, tempering, keeping the temperature at 540 ℃, keeping the temperature for 16 hours, and discharging for air cooling.
⑩ The test shows that the flaw detection meets the E/E grade in the SEP1921 standard, specifically shown in figure 2, the hardness of the side part (HRC) of the cross section is 39.6, the hardness of the quarter part (HRC) of the diagonal line is 39.3, the hardness of the core part (HRC) is 38.3, the requirement of the Hardness (HRC) in the range of 38-42 is met, and the purity is shown in Table 4.
TABLE 4 purity degree
Claims (3)
1. A preparation method of 10Ni3MnCuAl plastic die flat steel is characterized by comprising the following steps of molten iron-converter-LF-RH-continuous casting of phi 600mm or phi 700mm large round billets-red-packed heating and rolling flat billets-slow cooling-heating and rolling flat steel-on-line air cooling and solid solution-hot straightening-aging pre-hardening-checking and warehousing;
Adding molten iron and ferronickel alloy, controlling the tapping carbon to be 0.05% -0.10%, tapping phosphorus to be not more than 009%, and tapping nickel to be 2% -2.5%;
LF refining, namely adding 1000 kg-1200 kg of lime and 400 kg-500 kg of refining slag to perform slag making, deoxidizing by adopting calcium carbide or aluminum beans, ensuring that sulfur is not more than 0.005% before aluminum alloying, and adjusting the rest components to ensure that the components meet 0.14% -0.18% of carbon, 0.20% -0.30% of silicon, 1.45% -1.55% of manganese, not more than 0.015% of phosphorus, not more than 0.005% of sulfur, 3.00% -3.10% of nickel, 0.90% -1.0% of aluminum, 0.20% -0.25% of molybdenum and 0.85% -0.90% of copper;
RH vacuum treatment, wherein the ultimate vacuum degree is not more than 67Pa, the temperature is kept at least 20min, and the tapping hydrogen is not more than 1.5X10 -6;
The method comprises the steps of continuously casting a large round billet with phi 600mm or phi 700mm, adopting special high-aluminum steel casting powder, wherein the casting powder comprises 2% -5% of SiO 2：33％～43％,CaO：14％～24％,Al2O3, 9% -15% of solid carbon, not more than 4% of Fe 2O3, not more than 4% of MgO, 5% -12% of fluorine, 5% -12% of R 2O(Li2O+Na2O+K2 O, not more than 0.5% of moisture, 0.35% -0.65% of alkalinity, 940-960 ℃ of melting point, 0.25-0.55 Pa & s of viscosity, introducing argon into a tundish at least 5min before casting to remove air, introducing the large ladle of molten steel into the tundish through a long water gap during casting, then immediately adding carbonized rice hull covering agent, stopping introducing argon, finally enabling the molten steel in the large ladle to enter the tundish with the carbonized rice hull covering agent attached to the long water gap to isolate air through the long water gap, and then pulling out the continuous casting billet to prevent secondary oxidation;
The technological parameters of the continuous casting 600 circles include that the temperature of a tundish is 1531-1541 ℃, the casting superheat degree is 25-45 ℃, the pulling speed is 0.265 m/min+/-0.010 m/min, the crystallizer water is 3800L/min-4200L/min, the electromagnetic stirring of the crystallizer is carried out at the current 240A-260A, the frequency is 1.4 HZ-1.6 HZ, the continuous stirring is carried out, the electromagnetic stirring at the tail end is 440A-460A, the frequency is 4.3 HZ-4.7 HZ, and the alternating time is 25s-5s;
the technological parameters of continuous casting 700 circles include a tundish temperature of 1528-1539 ℃, a casting superheat degree of 25-45 ℃, a pulling speed of 0.170 m/min+/-0.010 m/min, crystallizer water of 4600L/min-5000L/min, electromagnetic stirring of the crystallizer, current 140A-160A, frequency of 1.4 HZ-1.6 HZ, continuous stirring, electromagnetic stirring of the tail end, current 440A-460A, frequency of 4.3 HZ-4.7 HZ and alternating time of 25s-5s-25s-5s;
Heating and rolling a flat blank, namely, red feeding the round blank into a furnace, heating to a material temperature of 1140-1160 ℃ at a temperature of not more than 80 ℃ per hour, keeping the 600 round for not less than 4 hours, keeping the 700 round for not less than 6 hours, keeping the reduction of at least 2 times of rolling to be not less than 50mm, controlling the total processing ratio of the cogging to be not less than 2, ensuring internal compaction, feeding the round blank offline into a pit for slow cooling after rolling, and discharging the round blank from the pit for cleaning the surface defects of the blank after slow cooling to below 200 ℃;
Heating and rolling flat steel, namely performing thorough heating on a flat blank at 800-900 ℃ in a preheating section, uniformly heating the flat blank at 1050-1100 ℃ in a soaking section, controlling the temperature of the soaking section in a 1120-1140 ℃ range, keeping the soaking section for 20-40 min, controlling the reduction of at least 2 passes to be not less than 20mm, controlling the total processing ratio of the blank to the material to be not less than 1.5, and ensuring the compactness of the core;
On-line air cooling and solid solution, namely accurately controlling the final rolling temperature to 830-870 ℃, preventing the coarse grains with higher temperature and lower temperature from influencing the on-line solid solution effect, and performing dispersed air cooling to 300-400 ℃ after rolling to straighten;
Straightening at the temperature of 200-400 ℃ so that straightening is easier and is not easy to crack, and air cooling is performed after straightening;
Tempering the straightened flat steel within 24 hours, on one hand, aging precipitation hardening, on the other hand, eliminating stress, preventing stress explosion caused by untimely tempering for too long, tempering and heat preservation at 525-545 ℃ and keeping for 12-16 hours, and discharging the flat steel from the furnace for air cooling.
2. The method for preparing the 10Ni3MnCuAl plastic die flat steel according to claim 1, wherein,
Smelting in a converter, namely smelting in a 110-ton top-bottom combined blown converter, charging 27 tons of nickel iron containing 8% -10%, adding molten iron, blowing, melting, tapping carbon 0.06%, tapping phosphorus 0.009%, tapping nickel 2.2%, and adding 90kg of aluminum blocks for deoxidization after tapping;
LF refining, namely adding 1060kg lime and 430kg refining slag to perform slag formation after molten steel arrives at a station, deoxidizing by adopting calcium carbide and aluminum beans, alloying elements except aluminum, removing sulfur to 0.003%, performing aluminum alloying, and keeping the total time of white slag for 42min, wherein the analysis components before hoisting and packing RH are carbon 0.16%, silicon 0.23%, manganese 1.48%, phosphorus 0.011%, sulfur 0.004%, nickel 3.03%, aluminum 0.92%, molybdenum 0.22% and copper 0.86%;
RH vacuum treatment, namely RH vacuumizing to the limit vacuum degree of 18Pa, maintaining for 21min, and determining hydrogen after breaking the air, wherein the hydrogen is 1.2 multiplied by 10 -6;
Introducing argon into a tundish 7min before casting, using high-aluminum steel casting powder, wherein the moisture content of the casting powder is SiO2：38.3％,CaO：18.1％,Al 2O3:4.8％,TC：12.3％,Fe2O3：3.6％,MgO：3.4％,F：9.5％,R2O(Li2O+Na2O+K2O)：9.6％,, the alkalinity is 0.2%, the melting point is 955 ℃, and the viscosity is 0.35 Pa.s;
Continuous casting process parameters are that the temperature of a tundish is 1531 ℃ to 1541 ℃, the pulling speed is 0.265m/min, the crystallizer water is 4000L/min, the electromagnetic stirring of the crystallizer is that the current is 250A, the frequency is 1.5HZ, the continuous stirring is carried out, the electromagnetic stirring at the tail end is that the current is 450A, the frequency is 4.5HZ, and the alternating time is 25s-5s-25s-5s;
heating and rolling a flat blank, namely, red feeding the round blank into a furnace at the furnace temperature of 653 ℃, heating to 1153 ℃ at the temperature of 68 ℃ per hour, keeping the temperature for 4.5 hours, wherein the first and second pass reduction amounts are 52mm and 55mm respectively, the cogging specification is 240mmx570mm, the cogging total processing ratio is 2.1, and after rolling, feeding the round blank into a pit for slow cooling, and slowly cooling to 176 ℃ and discharging the round blank from the pit for cleaning the surface defect of the blank;
Heating and rolling flat steel, namely, performing penetration heating on the flat steel in a preheating section at 813 ℃, wherein the temperature of the heating section is 1068 ℃, and after penetration, the flat steel enters a soaking section, wherein the temperature of the soaking section is 1138 ℃, and the residence time of the soaking section is 38min, wherein the rolling reduction of the 2 nd and 3 rd passes is respectively 22mm and 25mm, the specification of a finished flat steel product is 121mmx560mm, and the processing ratio of the blank to the material is 2.02;
On-line air cooling and solid solution, namely immediately lifting out, dispersing and placing air cooling after rolling at the final rolling temperature of 846 ℃, and transferring the air cooling to 396 ℃ to straightening;
temperature straightening, namely straightening at 283 ℃ and then dispersing and placing for air cooling;
Ageing and pre-hardening, namely charging into a furnace for tempering treatment after straightening for 13.5 hours, wherein the tempering heat preservation temperature is 540 ℃, and keeping the temperature for 14 hours and discharging for air cooling.
3. The method for preparing the 10Ni 3MnCuAl plastic die flat steel according to claim 1, which is characterized in that,
Smelting in a converter, namely smelting in a 110-ton top-bottom combined blown converter, charging 26 tons of nickel iron containing 8% -10%, adding molten iron, blowing, melting, tapping carbon 0.05%, tapping phosphorus 0.008%, tapping nickel 2.02%, and adding 116kg of aluminum blocks for deoxidization after tapping;
LF refining, namely adding 1083kg lime and 453kg refining slag to slag after molten steel arrives at a station, deoxidizing by adopting calcium carbide and aluminum beans, alloying elements except aluminum, removing sulfur to 0.004%, performing aluminum alloying, and keeping the total time of white slag for 46min, wherein the analysis components before hoisting and packing RH are carbon 0.15%, silicon 0.26%, manganese 1.51%, phosphorus 0.009%, sulfur 0.003%, nickel 3.02%, aluminum 0.94%, molybdenum 0.25% and copper 0.88%;
RH vacuum treatment, namely RH vacuumizing to the limit vacuum degree of 16Pa, maintaining for 20min, and determining hydrogen after breaking the air, wherein the hydrogen is 1.3X10 -6;
Introducing argon into a tundish 8min before casting, using high-aluminum steel casting powder, wherein the moisture content of the casting powder is SiO2：40.1％,CaO：20.2％,Al 2O3:3.1％,TC：11.2％,Fe2O3：3.1％,MgO：3.1％,F：10.4％,R2O(Li2O+Na2O+K2O)：7.3％,, the alkalinity is 0.3%, the melting point is 963 ℃, and the viscosity is 0.33 Pa.s;
Continuous casting process parameters are that the temperature of a tundish is 1528-1539 ℃, the pulling speed is 0.170m/min, the water of a crystallizer is 4800L/min, the electromagnetic stirring of the crystallizer is that the current is 150A, the frequency is 1.5HZ, the continuous stirring is carried out, the electromagnetic stirring at the tail end is that the current is 450A, the frequency is 4.5HZ, and the alternating time is 25s-5s-25s-5s;
Heating and rolling a flat blank, namely feeding the round blank into a furnace at 636 ℃ in a red way, heating to 1149 ℃ at 73 ℃ per hour, keeping the temperature for 6.5 hours, wherein the first and second pass reduction amounts are respectively 51mm and 53mm, the cogging specification is 230mmx620mm, the cogging total processing ratio is 2.7, feeding the round blank into a pit after rolling, slowly cooling to 188 ℃, discharging the round blank from the pit, and cleaning the surface defect of the blank;
Heating and rolling flat steel, namely, performing penetration heating on the flat steel in a preheating section at 822 ℃, wherein the temperature of the heating section is 1058 ℃, and after penetration, entering a soaking section, wherein the temperature of the soaking section is 1135 ℃, and the residence time of the soaking section is 40min, wherein the rolling reduction of the 2 nd and 3 rd passes is 21mm and 26mm respectively, the specification of a finished flat steel product is 141mmx610mm, and the processing ratio of the blank to the material is 1.66;
on-line air cooling and solid solution, namely immediately lifting out, dispersing and placing air cooling after rolling at the final rolling temperature of 866 ℃, and transferring the air cooling to 385 ℃ to straightening;
straightening at the temperature of 316 ℃, and dispersing and placing for air cooling after straightening;
And (3) ageing and pre-hardening, namely charging the steel into a furnace for tempering treatment 17 hours after straightening, and keeping the temperature at 540 ℃ for 16 hours, and discharging the steel from the furnace for air cooling.
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