CN110592463A - Low-alloy carbon die steel plate and production method thereof - Google Patents
Low-alloy carbon die steel plate and production method thereof Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
A low-alloy carbon die steel plate and a production method thereof, the steel plate comprises the following chemical components: c: 0.45-0.51%, Si: 0.30-0.45%, Mn: 0.80-1.00%, P is less than or equal to 0.018%, S is less than or equal to 0.003%, Cr: 0.15-0.30%, Mo: 0.30-0.50%, Ni: 0.40-0.60%, Cu: 0.30 to 0.50%, Nb: 0.025-0.045%, Al: 0.040-0.060%, the rest is Fe and inevitable impurities. The production method comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening. The low-alloy carbon die steel plate disclosed by the invention is low in alloy content, has the Brinell hardness value of 250-300 HBW and the impact energy of-20 ℃ of more than or equal to 100J, is high in hardness, good in low-temperature impact toughness and low in production cost, and can be applied to key parts of equipment for producing various dies.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-alloy carbon die steel plate and a production method thereof.
Background
With the rapid development of economy in China and the improvement of the living standard of people, the demand of die steel is increased rapidly, and die forming is mostly adopted for household appliance parts, electromechanical industrial parts, rubber products, ceramic products, plastic products and the like. Because the die is in environments of high temperature, pressure, stress and the like for a long time, the die steel has high requirements. Although China makes great progress in the research aspect of die steel, the rapid development of modern manufacturing industry puts higher requirements on the performance of the die steel. With the continuous improvement of the performance requirements of the industry on the die steel, the design of the carbon die steel with low alloy content and low production cost is urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-alloy carbon die steel plate which is high in hardness, good in low-temperature toughness, low in alloy content and low in production cost. The invention also provides a production method of the low-alloy carbon die steel plate.
The invention adopts the following technical scheme:
a low-alloy carbon die steel plate comprises the following chemical components in percentage by mass: c: 0.45-0.51%, Si: 0.30-0.45%, Mn: 0.80-1.00%, P is less than or equal to 0.018%, S is less than or equal to 0.003%, Cr: 0.15-0.30%, Mo: 0.30-0.50%, Ni: 0.40-0.60%, Cu: 0.30 to 0.50%, Nb: 0.025-0.045%, Al: 0.040-0.060%, the rest is Fe and inevitable impurities.
The thickness of the steel plate is 30-50 mm, the Brinell hardness value is 250-300 HBW, and the impact energy at-20 ℃ is more than or equal to 100J.
A production method of a low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening.
In the LF furnace refining process, the total refining time is more than or equal to 40min, and the white slag retention time is more than or equal to 20 min.
According to the vacuum treatment process of the VD furnace, the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 15min, a calcium wire is fed for calcium treatment after vacuum breakage, the feeding amount of the calcium wire is 1.5-2.5 kg/t of steel, and then the continuous casting blank is cast.
According to the rolling process, a type II controlled rolling process is adopted, the rolling temperature in the first stage is 1100-1120 ℃, the steel airing thickness is the sum of the thickness of a steel plate and 60mm, and the minimum rolling reduction in the first stage is more than or equal to 15%, so that the rolling force can be transmitted to the center of the steel billet to refine austenite grains and improve the internal quality of the steel plate; and in the second stage, the initial rolling temperature is 920-940 ℃, and the final rolling temperature is 860-880 ℃.
In the straightening process of the method, the rolled steel plate is straightened at high temperature for 3-5 times, and the steel plate is obtained after air cooling.
The content of each chemical component and the function in the invention are as follows:
c: 0.45-0.51%, and the carbon has obvious influence on the strength, impact toughness, welding performance, wear resistance and the like of the steel. Too low carbon content can cause low hardness and poor wear resistance of steel, influence the rolling control effect, increase the smelting control difficulty, and cause reduction of impact toughness of steel due to too high carbon content.
Si: 0.30-0.45%, silicon is a main reducing agent and deoxidizer in the steelmaking process, a certain amount of silicon is contained in killed steel, the silicon can show the elastic limit, yield point and tensile strength of the steel, and when the silicon exceeds 0.5%, the toughness of the steel is reduced, and the welding performance of the steel is reduced.
Mn: 0.80-1.00 percent of manganese, low in cost, is a good deoxidizer and desulfurizer, can increase the toughness, strength, hardness and wear resistance of steel, improve the hardenability of steel, improve the hot workability of steel, and weaken the corrosion resistance of steel due to overhigh manganese content.
P is less than or equal to 0.018 percent, and phosphorus is a harmful element in steel under the general condition, thereby increasing the cold brittleness of the steel, reducing the plasticity, deteriorating the cold bending property, and reducing the phosphorus content as much as possible under the condition of reasonable control cost.
S is less than or equal to 0.003 percent, sulfur is also a harmful element in steel, the hot brittleness of the steel is increased, the ductility and the toughness of the steel are reduced, cracks are caused during forging and rolling, but the sulfur can increase the free-cutting performance of the steel, and the content of the sulfur in the steel is reduced as much as possible under the economic benefit unless special requirements are met.
Cr: 0.15-0.30%, chromium has great influence on the strength and plasticity of steel, chromium can be dissolved in ferrite and austenite in a solid mode, and can form various carbides with carbon in the steel, so that the strength and hardness of the steel in a heat treatment state are improved, the chromium is widely applied to low-alloy structural steel, the chromium plays a strengthening role in the steel, the plasticity is reduced, and the proper chromium content is determined according to the requirement on the strong plasticity.
Mo: 0.30-0.50%, molybdenum can improve the strength, plasticity and low-temperature impact toughness of the steel, and the C curve of the steel can be shifted to the right when Mo is dissolved in ferrite and austenite in a solid manner, so that the hardenability of the steel is obviously improved; and molybdenum can obviously improve the recrystallization temperature of the steel, properly increase the molybdenum content and improve the toughness of the steel.
Ni: 0.40-0.60%, nickel can improve the strength of steel and can also enhance the plasticity and toughness of steel, but metal nickel belongs to scarce resources and has higher price, so for wear-resistant steel, a reasonable balance point should be taken between strength and hardness.
Cu: 0.30-0.50%, copper can improve the strength and toughness of steel and can also improve the corrosion resistance of steel, but when the content of copper is too high, hot brittleness is generated during hot processing, the plasticity is obviously reduced when the content exceeds 0.50%, and welding performance is not influenced when the content is less than 0.50%.
Nb: 0.025-0.045%, niobium can promote grain refinement of a steel microstructure and improve strength and toughness, niobium can effectively refine the microstructure by inhibiting austenite recrystallization in a controlled rolling process, steel hardenability is improved by precipitation strengthening, and niobium can reduce overheating sensitivity and temper brittleness of steel and improve welding performance.
Al: 0.040-0.060% of aluminum, wherein the aluminum is a common deoxidizer in steel, a small amount of aluminum is added into the steel, crystal grains can be refined, impact toughness is improved, the aluminum also has oxidation resistance and corrosion resistance, and the hot workability, welding performance and cutting workability of the steel are affected if the aluminum is too high.
The steel plate has reasonable chemical component design, adopts II type controlled rolling, and solves the problems of coarse and uneven crystal grains, low impact toughness and the like easily generated by common rolling. The steel plate has good comprehensive performance, meets the requirements of users on the wear resistance and toughness of the carbon die steel, can be applied to key parts of equipment produced by various dies, and has wide application prospect.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the low-alloy carbon die steel produced by the invention has high hardness and good wear resistance, and the Brinell hardness value is 250-300 HBW, and the impact energy at-20 ℃ is more than or equal to 100J. (ii) a 2. The steel plate has low alloy content, high hardness, good low-temperature toughness, controlled rolling state delivery, no heat treatment, low production cost and strong market competitiveness.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 40min, and the white slag retention time is 30 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 17min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 1.9kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the rolling temperature in the first stage is 1108 ℃, the steel airing thickness is 100mm, and the single-pass minimum reduction amount in the stage is 23%, so that the rolling force can be transmitted to the center of a steel billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 930 ℃, and the final rolling temperature is controlled at 860 ℃.
(4) Straightening: and (4) straightening the rolled steel plate with heat for 4 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 2
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 54min, and the white slag retention time is 28 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 17min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 1.5kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the rolling temperature in the first stage is 1110 ℃, the steel airing thickness is 90mm, and the minimum rolling reduction in the stage is 20%, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 920 ℃, and the final rolling temperature is controlled at 865 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with temperature for 3 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 3
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 61min, and the white slag retention time is 30 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 18min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.5kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the rolling temperature in the first stage is 1120 ℃, the steel airing thickness is 98mm, and the minimum rolling reduction in the stage is 22%, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 940 ℃, and the final rolling temperature is controlled at 860 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with hot temperature for 5 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 4
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 56min, and the white slag retention time is 25 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 15min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.5kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the initial rolling temperature of the first stage is 1120 ℃, the steel airing thickness is 110mm, and the minimum rolling reduction is 17% in the stage, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the start rolling temperature of the second stage is controlled at 928 ℃, and the finish rolling temperature is controlled at 868 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with temperature for 3 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 5
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 49min, and the white slag retention time is 26 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 20min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 1.7kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: by adopting a type II controlled rolling process, the rolling temperature is 1112 ℃ in the first stage, the steel airing thickness is 95mm, and the minimum rolling reduction is 25% in the stage, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 936 ℃, and the final rolling temperature is controlled at 880 ℃.
(4) Straightening: and (4) straightening the rolled steel plate with heat for 4 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 6
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 58min, and the white slag retention time is 35 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 15min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.2kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the initial rolling temperature of the first stage is 1105 ℃, the steel airing thickness is 110mm, and the minimum rolling reduction is 24% in the stage, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled to be 930 ℃, and the final rolling temperature is controlled to be 879 ℃.
(4) Straightening: and (4) straightening the rolled steel plate with heat for 4 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 7
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 53min, and the white slag retention time is 33 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 22min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.0kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a type II controlled rolling process is adopted, the rolling temperature in the first stage is 1100 ℃, the steel airing thickness is 92mm, and the minimum rolling reduction in the stage is 22%, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 925 ℃, and the final rolling temperature is controlled at 862 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with hot temperature for 5 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 8
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 45min, and the white slag retention time is 20 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 25min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.5kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the rolling temperature in the first stage is 1117 ℃, the steel airing thickness is 105mm, and the minimum rolling reduction in the first stage is 19%, so that the rolling force can be transmitted to the center position of a billet to refine austenite grains and improve the internal quality of a steel plate; the start rolling temperature of the second stage is controlled at 922 ℃, and the finish rolling temperature is controlled at 870 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with temperature for 3 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 9
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 40min, and the white slag retention time is 27 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 16min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 2.4kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a II type controlled rolling process is adopted, the initial rolling temperature at the first stage is 1101 ℃, the steel airing thickness is 113mm, and the minimum rolling reduction at the stage is 25%, so that the rolling force can be transmitted to the central position of a billet to refine austenite grains and improve the internal quality of a steel plate; the initial rolling temperature of the second stage is controlled at 920 ℃, and the final rolling temperature is controlled at 871 ℃.
(4) Straightening: and (4) straightening the rolled steel plate with heat for 4 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
Example 10
The production method of the low-alloy carbon die steel plate comprises the working procedures of converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling and straightening, and the working procedures comprise the following steps:
(1) and (3) refining in an LF furnace: sending the molten steel smelted by the converter into an LF refining furnace for refining, wherein the total refining time is 48min, and the white slag retention time is 32 min;
(2) and a VD furnace vacuum treatment process: vacuum degree is less than or equal to 66Pa, vacuum maintaining time is 30min, calcium is fed into a calcium wire for calcium treatment after vacuum destruction, the feeding amount of the calcium wire is 1.5kg/t steel, and then casting is carried out to obtain a continuous casting billet;
(3) a rolling procedure: a type II controlled rolling process is adopted, the rolling temperature in the first stage is 1115 ℃, the steel airing thickness is 109mm, and the minimum rolling reduction in the first stage is 15%, so that the rolling force can be transmitted to the center position of a billet to refine austenite grains and improve the internal quality of a steel plate; the start rolling temperature of the second stage II is controlled at 932 ℃, and the finish rolling temperature is controlled at 875 ℃.
(4) Straightening: and (3) straightening the rolled steel plate with hot temperature for 5 times to improve the flatness of the steel plate, and air cooling to obtain the steel plate.
The composition of the steel sheet of this example is shown in Table 1, and the thickness and mechanical properties of the steel sheet are shown in Table 2.
TABLE 1 examples 1-10 composition of steel sheet composition (%)
In table 1, the balance is Fe and inevitable impurities.
TABLE 2 thickness and mechanical Properties of the steel sheets of examples 1 to 10
Claims (8)
1. A low-alloy carbon die steel plate is characterized in that: the steel plate comprises the following chemical components in percentage by mass: c: 0.45-0.51%, Si: 0.30-0.45%, Mn: 0.80-1.00%, P is less than or equal to 0.018%, S is less than or equal to 0.003%, Cr: 0.15-0.30%, Mo: 0.30-0.50%, Ni: 0.40-0.60%, Cu: 0.30 to 0.50%, Nb: 0.025-0.045%, Al: 0.040-0.060%, the rest is Fe and inevitable impurities.
2. The low-alloy carbon die steel plate as claimed in claim 1, wherein the thickness of said steel plate is 30 to 50 mm.
3. The low-alloy carbon die steel plate as claimed in claim 2, wherein the steel plate has a Brinell hardness value of 250-300 HBW and an impact energy of 100J or more at-20 ℃.
4. The method for producing a low-alloy carbon die steel sheet as claimed in any one of claims 1 to 3, wherein the production method comprises converter smelting, LF furnace refining, VD furnace vacuum treatment, casting, rolling, straightening processes; the rolling process adopts a type II controlled rolling process, the rolling temperature in the first stage is 1100-1120 ℃, the steel airing thickness is the sum of the thickness of a steel plate and 60mm, and the minimum rolling reduction in the first stage is more than or equal to 15%.
5. The method for producing a low-alloy carbon die steel plate as claimed in claim 4, wherein in the LF furnace refining process, the total refining time is not less than 40min, and the white slag retention time is not less than 20 min.
6. The production method of the low-alloy carbon die steel plate as claimed in claim 4, wherein in the VD furnace vacuum treatment process, the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 15min, a calcium wire is fed for calcium treatment after vacuum failure, the feeding amount of the calcium wire is 1.5-2.5 kg/t of steel, and then the steel is cast into a continuous casting billet.
7. The method for producing a low-alloy carbon die steel plate as claimed in claim 4, wherein the rolling process is performed at a start rolling temperature of 920-940 ℃ and a finish rolling temperature of 860-880 ℃ in stage II.
8. The method for producing a low-alloy carbon die steel sheet as claimed in any one of claims 4 to 7, wherein the straightening step comprises straightening the steel sheet with hot air after rolling for 3 to 5 times, and air-cooling the steel sheet to obtain the steel sheet.
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