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CN111809114B - Plastic die steel with excellent high-temperature strength and preparation method thereof - Google Patents

Plastic die steel with excellent high-temperature strength and preparation method thereof Download PDF

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CN111809114B
CN111809114B CN202010644559.3A CN202010644559A CN111809114B CN 111809114 B CN111809114 B CN 111809114B CN 202010644559 A CN202010644559 A CN 202010644559A CN 111809114 B CN111809114 B CN 111809114B
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steel
temperature
die steel
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CN111809114A (en
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冯丹竹
隋轶
隋广雨
赵坦
范刘群
王婷
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Angang Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

本发明提供了一种具有优异高温强度的塑料模具钢及其制备方法，所述模具钢成分按重量百分比计如下：C：0.30％‑0.40％，Si：1.10％‑1.30％，Mn：0.9％‑1.1％，P≤0.015％，S≤0.015％，Cr：10.0％‑11.0％，Mo：0.42％‑0.60％，V：0.1％‑0.2％，Ta：0.10％‑0.20％，Co：0.40％‑0.60％，其中，Mo+V+Ta＝0.7％‑0.9％，余量为Fe及不可避免杂质。制备方法包括铁水预处理—冶炼—LF—RH—连铸—板坯加热—轧制—矫直—缓冷—正火—回火；应用本发明得到的模具钢硬度44‑46HRC，同板硬度差≤2HRC；室温下横向心部Rm≥1460MPa；500℃下横向心部Rm≥710MPa；同时该种模具钢均具有良好耐酸腐蚀性能。The invention provides a plastic mold steel with excellent high temperature strength and a preparation method thereof. The composition of the mold steel in weight percentage is as follows: C: 0.30%-0.40%, Si: 1.10%-1.30%, Mn: 0.9% ‑1.1%, P≤0.015%, S≤0.015%, Cr: 10.0%‑11.0%, Mo: 0.42%‑0.60%, V: 0.1%‑0.2%, Ta: 0.10%‑0.20%, Co: 0.40% -0.60%, among which, Mo+V+Ta=0.7%-0.9%, and the balance is Fe and inevitable impurities. The preparation method includes molten iron pretreatment—smelting—LF—RH—continuous casting—slab heating—rolling—straightening—slow cooling—normalizing—tempering; the hardness of the die steel obtained by applying the present invention is 44-46HRC, which is the same as that of the plate. The difference is less than or equal to 2HRC; the transverse core Rm≥1460MPa at room temperature; the transverse core Rm≥710MPa at 500℃; at the same time, this kind of die steel has good acid corrosion resistance.

Description

Plastic die steel with excellent high-temperature strength and preparation method thereof
Technical Field
The invention belongs to the field of metal materials, and particularly relates to plastic die steel with excellent high-temperature strength and a preparation method thereof.
Background
The rapid development of the plastic industry has determined that the requirements for forming dies are higher and higher, and the plastic dies have certain corrosion resistance while having high toughness. In addition, the plastic molding temperature is generally between 150-. Therefore, the plastic mold steel is also required to have good high-temperature strength.
Many domestic units do a lot of work in the aspects of developing and researching novel plastic die steel, improving the product quality, optimizing the production process, prolonging the service life of the die and the like.
The invention 'a high-temperature-resistant die steel and a preparation method thereof' with the application number of 201910049311.X discloses a high-temperature-resistant die steel, which comprises the following components in percentage by mass: c: 0.75% -0.95%, Cr: 6-8%, Si: 0.5% -1.5%, Al: 3% -5%, Ni: 0.3% -0.5%, Zn: 0% -0.2%, Mn: 0.5% -1.5%, B: 0.001% -0.5%, Re: 0.02-0.08 percent, less than or equal to 0.03 percent of P + S and the balance of Fe. And performing tempering treatment twice to obtain the die steel with high strength, high flexibility and good high-temperature resistance. However, the elongation is low, and the uniformity of hardness and corrosion resistance are difficult to ensure.
The invention with application number 201911385345.2, namely 'a high-temperature-resistant die steel and a manufacturing method thereof', discloses a high-temperature-resistant die steel and a preparation method thereof, wherein the high-temperature-resistant die steel comprises the following chemical components in percentage by mass: c: 0, 2% -0.3%, Si: 0.2% -0.4%, Mn: 0.3% -0.8%, W: 7.0% -9.0%, Mo: 1.0% -4.0%, Cr: 6.0% -8.0%, Co: 6.0% -10.0%, V: 0% -1.0%, Nb: 0% -0.5%, Re: 0% -0.05%, Zr: 0% -0.5%, Ti: 0 to 1.0 percent, and the balance of Fe and impurities. The die steel has strong high-temperature resistance and stable performance, greatly prolongs the service life of the die, and has the advantages of difficult deformation and high tensile strength in the using process. But the forging method has high cost, difficult realization of obdurability matching and good corrosion resistance at high temperature
The invention with application number 201410194383.0, namely the ultrahigh-strength die steel with good corrosion resistance and toughness, comprises the following components in percentage by mass: 0.08% -0.32%, Si: less than or equal to 0.8 percent, Mn: less than or equal to 0.5 percent, Cr: 5% -10%, Ni: 6.0% -8.0%, Co: 1.3% -1.8%, W: 0.9% -1.1%, V: 0.2% -0.5%, Nb: 0.08% -0.15%, N: less than or equal to 0.002%, O: less than or equal to 0.0015 percent, Mo: 0.9% -1.4%, Ti: 0.05% -0.4%, S: 0.011 percent to 0.025 percent. The die steel can be widely applied to the automobile industry requiring high strength and high toughness through forging processing means. But the forging cost is high, the yield is low, and the impact property of the plastic die steel is difficult to ensure.
Patent application No. 201610697851.5 entitled "high-strength die steel and processing method thereof" discloses die steel which comprises the following components in percentage by mass: c: 0.45% -0.65%, Cr: 4.16% -8.5%, Mo: 0.56% -2.13%, Mn: 0.55% -1.96%, Si: 1.45% -3.04%, Ta: 0.003% -0.009%, B: 0.13% -0.25%, W: 0.22 to 0.39 percent of iron, less than or equal to 0.023 percent of P, less than or equal to 0.019 percent of S and the balance of iron and inevitable impurities. The high-strength wear-resistant steel is obtained through forging and series of heat treatment, but the high-temperature performance and the corrosion resistance are difficult to guarantee, the production period is long, and the development direction of die steel is not met.
Disclosure of Invention
The invention aims to overcome the problems and the defects and provide plastic die steel with excellent high-temperature strength and high-efficiency and economical production process, which has the advantages of high strength hardness, high-temperature strength, corrosion resistance and the like and combines the cost and the performance of die steel, and a preparation method thereof.
The purpose of the invention is realized as follows:
a plastic die steel with excellent high-temperature strength comprises the following components in percentage by weight: c: 0.30% -0.40%, Si: 1.10% -1.30%, Mn: 0.9-1.1%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 10.0% -11.0%, Mo: 0.42% -0.60%, V: 0.1% -0.2%, Ta: 0.10% -0.20%, Co: 0.40-0.60%, wherein Mo + V + Ta is 0.7-0.9%, and the balance is Fe and inevitable impurities.
The plastic die steel has the hardness of 44-46HRC, and the hardness difference of the same plate is less than or equal to 2 HRC; at room temperature, the transverse center Rm is more than or equal to 1460 MPa; at 500 ℃, the transverse center Rm is more than or equal to 710MPa, and the thickness of the steel plate is 11-100 mm.
The invention adopts Mo, V and Ta high-melting-point transition metal elements and Cr and Mn multi-component composite action to strengthen the steel, simultaneously improves Si content, adds Co element for matching to ensure that the steel has higher high-temperature strength, and ensures that the corrosion-resistant plastic die steel has excellent room-temperature and high-temperature strength and good corrosion resistance.
The invention has the following design reasons:
c: in the martensitic stainless steel of the present invention, a part of carbon in the steel enters into the matrix of the steel to cause solid solution strengthening, and another part of carbon combines with carbide-forming elements in the alloying elements to form alloyed carbides, so that it greatly affects strength, ductility and weldability, and has an austenite forming ability 30 times that of Ni. In order to inhibit the formation of the delta ferrite, a proper amount of carbon element and austenite forming element are added, but the carbon content is too high to form carbide with Cr, so that the corrosion resistance in the steel is reduced, therefore, the content of C is selected to be 0.30-0.40%.
Si: si can generate Si enrichment or form a silicon oxide layer on the surface of steel, the high-temperature corrosion resistance of the steel is obviously improved, the Si belongs to strong ferrite forming elements, the precipitation of cementite can be effectively inhibited, the diffusion of C is prevented, the decomposition of martensite structures and the aggregation and growth speed of carbides are delayed, the hardness of the steel is slowly reduced during tempering, and the tempering stability and strength of the steel are obviously improved. However, the content of Si is too high, so that delta ferrite is easily generated, the strong plasticity of steel is reduced, the diameter of spheroidized carbide particles is enlarged, the spacing is increased, the segregation is promoted, a banded structure is formed, and the transverse performance is lower than that of the longitudinal performance, so that the beneficial effect of Si is exerted by matching Mo, V, Ta and other elements while the content of Si is increased, and the formation of delta ferrite is inhibited, wherein the content of Si is selectively added to be 1.10-1.30%.
Mn: the alloy deoxidizer and the desulfurizer which are widely used in smelting can ensure that the steel is quenched at a wider cooling speed to obtain a martensite structure. Mn is a strong austenite stabilizing element, suppresses the formation of δ ferrite, and improves the hardenability of the steel. However, when too much manganese is added to the steel, the grains become coarse, which reduces the corrosion resistance of the die steel and affects the weldability thereof. Therefore, the content of Mn added is 0.9-1.1%.
P, S: s is distributed in the steel in the form of MnS, and the MnS extends along the rolling direction in the hot rolling process, so that the transverse mechanical property of the sulfur free-cutting steel is obviously reduced, and the anisotropy of the steel is enhanced. Meanwhile, S is harmful to the corrosion resistance of the die steel, so that the welding performance is deteriorated. Although P can increase ferrite hardness in a proper amount and improve the surface finish and machinability of parts, too high P in steel increases cold brittleness, and too much S, P affects the homogeneity and purity of the steel. Therefore, P is less than or equal to 0.015 percent and S is less than or equal to 0.015 percent are selectively added.
Cr: as the most important alloy element in the corrosion-resistant plastic die steel, the hardenability of the steel can be improved, the secondary strengthening effect is achieved, and the hardness and the wear resistance of the steel are increased without embrittling the steel. In particular, when the content of chromium in the stainless steel of the present invention exceeds 10%, the steel can have good high-temperature oxidation resistance and corrosion resistance. The steel forms chromium-rich precipitation phases during the heat treatment, which increases the tempering stability of the steel, but also increases the temper brittleness of the steel. Therefore, the content of the Cr added is 10.0-11.0%.
Mo: mo in steel can raise hardenability of steel, at the same time can form special carbide in steel, and can raise secondary hardening capacity and tempering stability of steel, and the molybdenum and carbon are combined, and more fine short rod-like Mo can be separated out during tempering2C carbide plays a great role in improving the tempering stability of the steel. Mo element is one of the most effective elements for improving the pitting corrosion resistance of the plastic die steel, and the Mo element is MoO42-Form of (2) dissolves and adsorbs on the metal surface to form a protective film, inhibiting Cl-To prevent Cl-The pitting corrosion resistance is improved by increasing the pitting potential and reducing the pitting corrosion speed of the stainless steel. In the invention, V microalloying is adopted and Mo is added simultaneously, so that the formation of martensite or bainite structures in a high-temperature region can be remarkably promoted, and the structure refinement is obviously acted, thereby being beneficial to obtaining high-strength plastic die steel with excellent performance. However, too much Mo content will promote the formation of delta ferrite, resulting in adverse effects. Therefore, the content of Mo added in the invention is 0.42-0.60%.
V: in the present invention, V mainly exerts a uniform structure and a precipitation strengthening effect during hot working, and exists mainly in two forms in steel, i.e., solid dissolution in steel and precipitation in the form of carbonitride. When the material is dissolved in steel, the stability of super-cooled austenite can be improved, the hardenability is increased, the phase transition temperature is reduced, the super-cooling degree is increased, the appearance of bainite martensite hard phase is promoted, and the hardness is improved; when V is precipitated in the form of carbide, a large number of nucleation positions are created at the precipitation positions, and the tiny and dispersed VC plays a role in obvious precipitation strengthening and uniform organization, thereby effectively improving the fatigue crack initiation and expansion resistance of the die steel. However, since too much V content tends to cause the carbide to aggregate and precipitate continuously along the grain boundaries, thereby disrupting the continuity of the grain boundaries and reducing the impact toughness, V: 0.1 to 0.2 percent.
Ta: ta can be partially dissolved in steel to play a role in solid solution strengthening, and the hardenability of the steel is obviously improved. In the invention, Ta exists in the form of carbide and oxide particles, so that grains can be refined, and the tempering stability of the steel is improved. Because of the fine-grain strengthening effect, the strength can be improved under the condition of not influencing the plasticity and toughness of the steel. Because of the functions of carbon fixation and precipitation hardening, the heat strength of the die steel can be improved, and the service life of the die steel can be prolonged. However, the content of Ta can fix all carbon elements, so that the effects of V, Mo and other elements cannot be exerted, therefore, the invention selects to add Ta: 0.10 to 0.20 percent.
The steel is strengthened by adopting the multi-element composite action of the high-melting-point transition metal elements of Mo, V and Ta, so that the steel has higher strength, hardness and toughness matching compared with other corrosion-resistant plastic die steel, and simultaneously has good high-temperature strength and high-temperature corrosion resistance, therefore, the invention selects and adds 0.7-0.9% of Mo + V + Ta.
Co: the Co element can improve the strength of steel, Co does not form carbide and is dissolved in solid solution, and the Co element plays a role in solid solution strengthening at high temperature, so that the thermal stability of the plastic die steel is enhanced, the high-temperature tempering hardness and the wear resistance of the plastic die steel are improved, the high-temperature brittle failure tendency is reduced, and the plasticity performance in the heating process is improved. Meanwhile, Co can enhance the high-temperature softening resistance of the plastic die steel at the temperature of over 500 ℃. Considering the cost factor of Co addition in the invention, the addition is selected from 0.40-0.60%.
The second technical scheme of the invention provides a preparation method of plastic die steel with excellent high-temperature strength, which comprises the steps of molten iron pretreatment, smelting, LF-RH, continuous casting, slab heating, rolling, straightening, slow cooling, normalizing and tempering;
the continuous casting slab is heated to 1230-1280 ℃, the soaking section is kept warm for 5-6h, and because the high melting point transition group alloy elements are added in the invention, the alloy elements are fully dissolved by adopting higher slab heating temperature and are dissolved in steel to play a role of solid solution strengthening. The die steel has more alloy elements, and the adoption of long-time soaking section heating can improve the composition nonuniformity of a plate blank in the continuous casting process and reduce the internal microsegregation. In order to reduce the rolling force of the subsequent large reduction, the initial rolling temperature is controlled to be 1050-1080 ℃, and the reduction ratios of the first three passes during the steel plate rolling are 18-22%. The deformation penetration depth can be improved by adopting a large reduction rate, so that coarse columnar crystals can be crushed to form fine and uniform crystal grains, the central structure defects are welded, the finish rolling temperature is more than or equal to 950 ℃, and a steel plate with the thickness of 11-100mm is obtained. The offline temperature of the steel plate is 300-400 ℃. And (5) immediately stacking and slowing down the line by adopting a mode of laying down and covering up, wherein the slow cooling time is 28-38 h.
Then normalizing at 900-950 ℃, preserving heat for 4-5h, and cooling in air to room temperature. The invention can obtain high strength and toughness and good uniform elongation by adopting lower normalizing temperature, and the die steel can obtain excellent comprehensive performance by grain refinement in the structure, toughening action of soft and tough phases and strengthening action of hard phases. And finally, tempering at 630-680 ℃, and preserving heat for 2-3h, thereby effectively reducing stress and controlling tissue banding caused by solid phase change.
The invention has the beneficial effects that: the invention adopts Mo, V and Ta high-melting-point transition metal elements and Cr and Mn multi-element composite action to strengthen the steel, simultaneously improves Si content, adds Co element for matching to enable the steel to have higher high-temperature strength, and matches with the continuous casting-slab high-temperature heating-normalizing-tempering process for production, so that the corrosion-resistant plastic die steel has the final-state hardness of 44-46HRC, and the hardness difference of the same plate is less than or equal to 2 HRC; at room temperature, the transverse center Rm is more than or equal to 1460 MPa; at 500 ℃, the transverse center Rm is more than or equal to 710 MPa. The corrosion rate is respectively less than or equal to 2.0g/(m2 h) and 2.9g/(m2 h) in 10% hydrochloric acid solution at the test temperature of 25 ℃ and 500 ℃ for 30 h. The die steel has good acid corrosion resistance. The plastic die steel has the advantages of high strength, hardness, corrosion resistance, high-temperature performance and the like, is an efficient and economical production process, is suitable for die markets with continuously expanded application ranges, continuously improves application requirements, and has wide application prospects.
Detailed Description
The present invention is further illustrated by the following examples.
According to the component proportion of the technical scheme, the embodiment of the invention carries out molten iron pretreatment, smelting, LF-RH, continuous casting, slab heating, rolling, straightening, slow cooling, normalizing and tempering.
Heating the continuous casting slab to 1230-1280 ℃, preserving heat for 5-6h at a soaking section,
the initial rolling temperature is 1050-; and (5) immediately after the production is finished, slowly cooling by adopting a stack, wherein the slow cooling time is 28-38 h.
Then normalizing at 900-950 ℃, preserving the heat for 4-5h, and cooling to room temperature in air; then tempering at 630-680 ℃, and preserving the temperature for 2-3 h.
The compositions of the steels of the examples of the invention are shown in table 1. The main process parameters of the steel of the embodiment of the invention are shown in Table 2. The main heat treatment process parameters of the steels of the examples of the invention are shown in Table 3. The Rockwell hardness of the steels of the examples of the present invention is shown in Table 4. The tensile properties of the steels of the examples of the invention are shown in Table 5. The corrosion resistance of the steel of the invention is shown in Table 6.
TABLE 1 composition (wt%) of steels of examples of the present invention
Figure BDA0002572539330000091
TABLE 2 Main Process parameters of the steels of the examples of the invention
Figure BDA0002572539330000092
TABLE 3 Main Heat treatment Process parameters of the steels of the examples of the invention
Figure BDA0002572539330000101
TABLE 4 Rockwell hardness of steels of examples of the invention
Figure BDA0002572539330000111
TABLE 5 tensile Properties of steels according to examples of the invention
Examples Direction Rm (MPa) at room temperature Rm (MPa) at 500 DEG C
1 Horizontal bar 1470 725
2 Horizontal bar 1465 720
3 Horizontal bar 1469 719
4 Horizontal bar 1475 710
5 Horizontal bar 1477 715
6 Horizontal bar 1480 730
7 Horizontal bar 1460 711
8 Horizontal bar 1468 729
9 Horizontal bar 1473 712
10 Horizontal bar 1476 722
TABLE 6 Corrosion resistance of inventive steels
Examples Corrosion rate/g/(m 2. h) at 25 DEG C Corrosion rate/g/(m 2. h) at 500 DEG C
1 1.99 2.88
2 1.97 2.85
3 1.95 2.80
4 1.92 2.82
5 1.90 2.86
6 1.98 2.83
7 2.00 2.90
8 1.91 2.89
9 1.94 2.87
10 1.93 2.81
Remarking: the experimental conditions are as follows: soaking in 10% hydrochloric acid solution at 25 deg.C and 500 deg.C for 30 hr
In order to describe the present invention, the above embodiments are properly and fully described by way of examples, and the above embodiments are only used for illustrating the present invention and not for limiting the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made by the persons skilled in the relevant art should be included in the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (2)

1. A plastic die steel with excellent high-temperature strength is characterized by comprising the following components in percentage by weight: c: 0.36% -0.40%, Si: 1.10% -1.29%, Mn: 0.9-1.1%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 10.0% -10.9%, Mo: 0.42% -0.60%, V: 0.1% -0.2%, Ta: 0.10% -0.20%, Co: 0.40% -0.60%, wherein Mo + V + Ta =0.7% -0.9%, and the balance of Fe and unavoidable impurities;
the preparation method of the plastic die steel with excellent high-temperature strength comprises the steps of molten iron pretreatment, smelting, LF-RH, continuous casting, slab heating, rolling, straightening, slow cooling, normalizing and tempering;
heating the continuous casting slab to 1230-; the initial rolling temperature is 1050-; after the wire is off, the stack is adopted for slow cooling immediately, and the slow cooling time is 28-38 h; then normalizing at 900-950 ℃, preserving the heat for 4-5h, and cooling to room temperature in air; then tempering at 630-680 ℃, and preserving the temperature for 2-3 h.
2. The plastic die steel with excellent high-temperature strength as claimed in claim 1, wherein the plastic die steel with excellent high-temperature strength has a hardness of 44-46HRC, and the same plate hardness difference is ≤ 2 HRC; at room temperature, the tensile strength Rm of the transverse center part is more than or equal to 1460 MPa; at 500 ℃, the tensile strength Rm of the transverse center part is more than or equal to 710MPa, and the thickness of the plastic die steel with excellent high-temperature strength is 11-100 mm.
CN202010644559.3A 2020-07-07 2020-07-07 Plastic die steel with excellent high-temperature strength and preparation method thereof Active CN111809114B (en)

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CN113481357B (en) * 2021-06-30 2022-06-21 江苏省沙钢钢铁研究院有限公司 Plastic mold steel plate and production method thereof
CN115747670B (en) * 2022-12-01 2024-04-26 山西太钢不锈钢股份有限公司 NAK80 bar finishing heat treatment process suitable for conventional equipment
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CN103774047A (en) * 2012-10-20 2014-05-07 大同特殊钢株式会社 Steel for molding die having excellent thermal conductivity, mirror polishing properties and toughness
CN109023119A (en) * 2018-10-08 2018-12-18 鞍钢股份有限公司 Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof
CN109504899A (en) * 2018-12-05 2019-03-22 鞍钢股份有限公司 Plastic die steel and preparation method thereof
CN110230009A (en) * 2019-05-14 2019-09-13 鞍钢股份有限公司 Hot work die steel with good cutting performance and preparation method thereof
CN110863156A (en) * 2019-10-28 2020-03-06 鞍钢股份有限公司 A kind of hot work die steel and efficient preparation method thereof

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CN101403074A (en) * 2008-09-19 2009-04-08 周向儒 Novel chromium system hot die steel and thermal treatment process thereof
CN103774047A (en) * 2012-10-20 2014-05-07 大同特殊钢株式会社 Steel for molding die having excellent thermal conductivity, mirror polishing properties and toughness
CN109023119A (en) * 2018-10-08 2018-12-18 鞍钢股份有限公司 Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof
CN109504899A (en) * 2018-12-05 2019-03-22 鞍钢股份有限公司 Plastic die steel and preparation method thereof
CN110230009A (en) * 2019-05-14 2019-09-13 鞍钢股份有限公司 Hot work die steel with good cutting performance and preparation method thereof
CN110863156A (en) * 2019-10-28 2020-03-06 鞍钢股份有限公司 A kind of hot work die steel and efficient preparation method thereof

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