CN111850397B - High-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance and preparation method thereof - Google Patents

High-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance and preparation method thereof Download PDF

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CN111850397B
CN111850397B CN202010644571.4A CN202010644571A CN111850397B CN 111850397 B CN111850397 B CN 111850397B CN 202010644571 A CN202010644571 A CN 202010644571A CN 111850397 B CN111850397 B CN 111850397B
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die steel
temperature
equal
steel
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CN111850397A (en
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冯丹竹
隋广雨
黄岩
郑欣
范刘群
杨军
石锋涛
张宏亮
李红亮
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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
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

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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

The invention provides high-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance and a preparation method thereof, wherein the die steel comprises the following components in percentage by weight: c: 0.28% -0.38%, Si: 0.80% -1.00%, Mn: 1.2-1.5%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 13.0% -14.0%, Ni: 3.5% -4.5%, Cu: 1.0% -1.5%, B: 0.40% -0.50%, wherein Cu + B is 1.5% -1.9%, and the balance is Fe and unavoidable impurities; the preparation method comprises the steps of molten iron pretreatment, smelting, LF-RH, continuous casting, slab heating, rolling, straightening, slow cooling and heat treatment, and the hardness of the die steel produced by the method is 36-39 HRC; at the room temperature of 500 ℃ and the cycle number of 500cyc, Rm is more than or equal to 410MPa, A% is more than or equal to 35%, and the thermal fatigue grade is 2-3 grade; meanwhile, the cutting fluid has good acid corrosion resistance and excellent cutting performance.

Description

High-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance and preparation method thereof
Technical Field
The invention belongs to the technical field of metal material production, and particularly relates to high-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance 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 molding temperature of the plastic is generally between 150 ℃ and 400 ℃, if the flowability of the plastic is poor, the local heat of the mold can be accumulated, the local heat can exceed 400 ℃ in a short time, and the excessive temperature causes the thermal deformation of the mold to cause the reduction of the precision. Therefore, the plastic die steel is also required to have high thermal fatigue resistance.
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.
A hot work die steel material (application number: 200610116358.6) with high heat strength is disclosed, which comprises the following components in percentage by weight: cr: 3.5% -4.0%, Mo: 2.0% -2.5%, V: 1.0% -1.5%, W: 1.0% -1.5%, Mn: 0.1% -0.5%, Ni: 0.1% -0.25%, C: 0.3% -0.35%, Si: 0.1% -0.5%, S: 0.005% -0.01%, P: 0.01 to 0.02 percent. The die steel has high service hardness, the hardness is in the range of 48-54HRC, the room temperature impact toughness of the material is more than 300J, and the material has excellent thermal fatigue performance, but the corrosion resistance can not be ensured.
The invention discloses die steel with high thermal stability and high strength (application number: 200710171693.0), which comprises the following components in percentage by weight: c: 0.3% -0.6%, Si: 0.5% -0.7%, Mn: 10.5% -14.5%, Cr: 2.0% -6.0%, Mo: 1.5% -3.5%, V: 0.5% -2.0%, P: 0.01-0.02% and S less than 0.005%. The die steel has the greatest advantages of good thermal stability, high hardness which can be kept at 700 ℃, high hardness which is more than HRC45, room-temperature impact toughness which is more than 300J, high hardness which is difficult to cut and process, and difficulty which is increased for subsequent processing.
The invention discloses a process method for rolling a plate by using 4Cr13 medium plate corrosion-resistant die steel (application number: 201310226708.4), which solves the problems of thermal stress cracking and easy brittle fracture after cooling of the rolled plate by using 4Cr13 corrosion-resistant die steel, but the obdurability matching and the corrosion and wear resistance of the rolled plate are difficult to guarantee.
Invention 3Cr17NiMo-ESR plastic die steel (application number: 201810238021.5) discloses a quenched and tempered 3Cr17The NiMo-ESR plastic die steel comprises the following components in percentage by weight: 0.30-0.40%, Si is less than or equal to 1.00%, Mn is less than or equal to 1.00%, Cr: 16.00% -17.50%, Ni: 0.60% -1.00%, Mo: 0.80 to 1.30 percent of the total weight of the composition, less than or equal to 0.020 percent of S and less than or equal to 0.035 percent of P% of the total weight of the composition. The hardness of the plastic die steel is 30-36HRC, but the homogeneity is poor, the wear resistance is difficult to ensure, and the forging processing is adopted, so that the yield is low and the performance is unstable.
The invention discloses a plastic die steel with corrosion resistance and a manufacturing method thereof (application number: 201410124967.0), and the plastic die steel with corrosion resistance comprises the following components in percentage by mass: 0.20% -0.32%, Si: 0.12% -0.15%, Mn: 0.05% -0.15%, P: 0.06% -0.08%, S: 0.01% -0.015%, N: 0.1% -0.15%, Ni: 3.5% -4.0%, Cr: 8.5% -10.5%, Cu: 0.25% -0.45%, Mo: 0.45-0.5% and 12-14.5% of Cr + Ni. The corrosion resistance is greatly improved under the condition of ensuring the original strength, elongation, wear resistance and cutting performance of the plastic die steel, but the toughness is poorer.
The invention discloses high-nitrogen high-chromium plastic die steel and a smelting and heat treatment method thereof (application number: 201811433208.7), and discloses the high-nitrogen high-chromium plastic die steel which comprises the following components in percentage by mass: 0.25% -0.35%, Si: 0.45% -0.8%, Mn: 0.40% -0.70%, Cr: 16.5% -17.5%, Ni: 0.1% -0.3%, Mo: 0.1% -0.5%, N: 0.06-0.10 percent, and the balance of iron and inevitable impurities. The design idea of adding nitrogen for alloying and reducing the use of molybdenum elements is provided, nitrogen alloying is directly realized by blowing nitrogen, and the purpose of excellent corrosion resistance is achieved by matching with the heat treatment process of spheroidizing annealing, isothermal quenching and tempering, but the strength, hardness and toughness are difficult to ensure.
The invention discloses an ultrahigh-strength die steel with good corrosion resistance and toughness (application number: 201410194383.0), which 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.
The invention discloses plastic die steel and a preparation method thereof (application number: 201710381394.3), wherein the plastic die steel comprises the following components in percentage by mass: 0.16% -0.26%, Si: less than or equal to 1 percent, Mn: less than or equal to 1 percent, Cr: 11% -16%, N: 0.06% -0.16%, Mo: 0.10 to 0.25 percent. The die steel is subjected to microalloying of N and Mo, so that the quenching hardness is improved, the die steel has good pitting corrosion resistance, but the plasticity and the toughness are difficult to ensure.
The invention relates to a heat treatment method of high-nitrogen corrosion-resistant plastic die steel (application number: 201510889604.0), which comprises the following components in percentage by mass: 0.50% -0.55%, Si: 0.3% -0.5%, 0.4% -0.5% of Mn, Cr: 16.5% -17.55, Mo: 0.90% -1.10%, V: 0.08% -0.12%, N: 0.2 to 0.25 percent. The die steel of the invention adopts high-temperature diffusion annealing to eliminate carbide and banded segregation, and then carries out forging, spheroidizing annealing, quenching and tempering to prepare the high-nitrogen corrosion-resistant plastic die steel with high hardness, good toughness and strong corrosion resistance, but the forging cost is high, the yield is low, and the die steel finished product obtained by the invention has small size specification and has limitation in use.
The invention discloses a heat treatment method of high-nitrogen high-corrosion-resistance plastic die steel (application number: 201811285368.1), which comprises the following components in percentage by weight: 0.35% -0.45%, Si: 0.3% -0.5%, Mn: 0.3% -0.6%, Cr: 13.0% -14.0%, Mo: 0.05% -0.08%, N: 0.06% -0.08%. The invention adopts the steps of spheroidizing annealing, salt bath quenching and tempering distribution, and element distribution is completed in the tempering stage to obtain the plastic die steel with excellent performance. However, the die steel has small section size and is greatly limited by a heating furnace, and is difficult to realize in large-scale production.
The plastic die steel C disclosed in the invention (application No. 201711181166.8) for a plastic die steel having corrosion resistance and a method for manufacturing the same: 0.45% -0.55%, Si: 0.40% -0.80%, Mn: 0.80% -1.60%, V: 0.10% -0.25%, N: 0.007% -0.015%, Al: 0.005% -0.050%, Ni: 3.5% -4.0%, Cr: 8.5% -10.5%, Cu: 0.25 to 0.45 percent of Cr and Ni, 12 to 14.5 percent of Cr and Ni, and adopts the production process routes of forging, heat preservation tempering, rough machining, hot rolling, high temperature tempering, finish machining, forging, tempering and cooling to be more complicated and have long production period.
Disclosure of Invention
The invention aims to overcome the problems and the defects and provide a high-temperature-resistant and corrosion-resistant plastic die steel with excellent cutting performance and a preparation method thereof, which combines the production processes of corrosion, cutting, high-temperature performance and the like, is efficient and economical.
The purpose of the invention is realized as follows:
a high-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance comprises the following components in percentage by weight: c: 0.28% -0.38%, Si: 0.80% -1.00%, Mn: 1.2-1.5%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 13.0% -14.0%, Ni: 3.5% -4.5%, Cu: 1.0% -1.5%, B: 0.40-0.50%, wherein Cu + B is 1.5-1.9%, and the balance is Fe and inevitable impurities.
The hardness of the plastic die steel is 36-39HRC, and the hardness difference of the same plate is less than or equal to 2.5 HRC; the thermal fatigue grade of the die steel from room temperature to 500 ℃ is 2-3.
The invention has the following design reasons:
c: in the present invention, carbon is used as a strengthening element for interstitial solid solution to improve the strength and hardness of the plastic die steel. The limiting solubility of carbon in steel decreases with increasing Cr content, whereas an excessively high carbon content would adversely decrease the corrosion resistance of the steel. In the invention, because a proper amount of B element is added, boride can be generated at a crystal boundary to replace partial carbide as a strengthening phase, and the content of carbon is properly reduced, so that the die steel with good toughness and matching performance can be obtained, and the content of C is selected to be 0.28-0.38%.
Si: the strong ferrite forming element can effectively inhibit the precipitation of cementite and prevent the diffusion of C, thereby delaying the decomposition of martensite structure and the aggregation and growth speed of carbide, slowing the reduction of the hardness of the steel during tempering and obviously improving the tempering stability and strength of the steel. In addition, in a high-temperature and strong-oxidizing environment, the addition of the Si element can improve the oxidation resistance and the corrosion resistance of the steel and reduce the pitting tendency of the steel in an environment containing chloride ions. However, the excessive amount of Si makes the spheroidized carbide particles larger in diameter and larger in spacing, and at the same time promotes segregation, resulting in the formation of a band-shaped structure, so that the transverse properties are lower than those in the longitudinal direction, therefore, the Si content is selected to be 0.80-1.00%.
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 and can improve the hardenability of 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 selectively added is 1.20-1.50%.
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 chromium content in the stainless steel exceeds 12%, 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 Cr added is 13.0-14.0%.
Ni: can improve the strength and toughness of the steel and improve the hardenability. Can improve the passivation tendency of the iron-chromium alloy and can improve the corrosion resistance of the steel in a reducing medium. Especially has higher corrosion resistance to acid and alkali, and has antirust and heat-resisting capabilities at high temperature. Meanwhile, copper brittleness caused by adding Cu element into the die steel can be avoided. Therefore, Ni: 3.5 to 4.5 percent.
Cu: the copper element can obviously improve the cutting performance and the corrosion resistance of the plastic die steel. The low-melting-point copper-rich phase precipitated in the steel plays a role in lubricating the cutter in the cutting process of the cutter, and the cutting force is reduced. However, the excessive copper element can improve the cutting performance and the corrosion resistance of the material and simultaneously deteriorate the hot working performance of the material, so that the invention adds a proper amount of Ni element to avoid the damage to the hot working performance of the material and simultaneously controls the content of the Cu element to be 1.0-1.5%.
B: boron element is mainly stabilized by M in the plastic die steel2The B form exists, boride which is dispersed has pinning effect and strengthening effect on a matrix, and boride has better thermal stability than carbide, does not aggregate and grow along with the progress of a thermal fatigue process, and has continuous and stable strengthening effect on the matrix; the combination of the endogenous boride and the matrix is tight, and the growth of thermal fatigue cracks is effectively blocked, so that the plastic die steel has excellent high-temperature mechanical property and thermal fatigue resistance, and B: 0.40 to 0.50 percent.
The B element in the invention can improve the strength, hardness and high-temperature mechanical property of the plastic die steel in the form of boride, and the Cu element plays a role in lubricating the cutter in the cutting process of the cutter in the form of low-melting-point copper-rich phase, thereby reducing the cutting force, improving the cutting property of the material and improving the corrosion resistance of the material. But the two need to act together to ensure that the plastic die steel has the advantages of strength, hardness, high-temperature mechanical property, cutting property and corrosion resistance. Therefore, the invention controls the Cu + B to be 1.5-1.9%.
The second technical scheme of the invention is to provide a preparation method of high temperature resistant and corrosion resistant plastic die steel with excellent cutting performance, which comprises the steps of molten iron pretreatment, smelting, LF-RH, continuous casting (under light pressure), plate blank heating, rolling, straightening, slow cooling and heat treatment;
the continuous casting plate blank is heated to 1150-1180 ℃, the soaking section is insulated for 5-6 hours, and the Cu element has certain influence on the hot workability of the die steel, so the invention adopts low-temperature heating, can refine the plate blank structure, and ensures that the rolled steel plate has finer structure due to the inheritance of the structure. 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 high reduction, the initial rolling temperature is controlled to be 1050-1070 ℃, and the reduction of the first four non-widening passes is more than or equal to 29.5mm during the rolling of the steel plate. The rolling reduction rate and the single-pass reduction are increased, the deformation penetration depth can be improved, coarse columnar crystals can be crushed, fine and uniform crystal grains are formed, and the central structure defect is improved. The final rolling temperature is more than or equal to 950 ℃, and a finished steel plate with the thickness of 11-120mm is obtained. The offline temperature of the steel plate is 300-400 ℃. And after the wire is off, stacking and slowly cooling for 24-36 h.
Because this kind of novel die steel mainly adopts boride as the intensive phase, and the second phase carbide precipitates to strengthen as the assistance, therefore the thermal treatment process of die steel is comparatively simple, adopts one tempering process: the tempering temperature is 600-650 ℃, and the heat preservation is carried out for 4-5 h. On one hand, the stress can be effectively reduced, and the formation of a banded structure is controlled, on the other hand, the heat treatment process is efficient and economical, and the development direction of the production process of the composite die steel is in the direction.
Further, the method comprises the following steps of; the stacking slow cooling adopts a mode of 'laying the lower part and covering the upper part'.
The invention has the advantages that; according to the invention, the boride generated in the steel is taken as a main strengthening phase under the combined action of Cu and B elements, and the carbide precipitation of a second phase is taken as an auxiliary strengthening phase, so that a matrix with good toughness and the plastic die steel with good high-temperature stability are obtained, instead of adopting the idea of strongly forming carbide elements such as Mo and V, and the like, the corrosion-resistant plastic die steel is produced by matching with the process of continuous casting, slab low-temperature heating and one-time tempering heat treatment, so that the corrosion-resistant plastic die steel has the final-state hardness of 36-39HRC, and the hardness difference of the same plate is less than or equal to 2.5 HRC; under the condition that the room temperature is 500 ℃ and the cycle frequency is 500cyc, Rm is more than or equal to 410MPa, A% is more than or equal to 35%, and the thermal fatigue grade of the die steel sample is 2-3 grades according to the Uddeholm map; the die steel has good acid corrosion resistance and excellent cutting performance when being soaked in 10% hydrochloric acid solution for 36h at the test temperature of 25 ℃. The plastic die steel disclosed by the invention has the advantages of corrosion, cutting, high-temperature performance and the like, is an efficient and economical production process, is suitable for a die market with an expanding application range and continuously improved application requirements, and belongs to high-end plastic die steel with wide application prospects.
Detailed Description
The present invention is further illustrated by the following examples.
The embodiment of the invention carries out the pretreatment of molten iron, smelting, LF-RH-continuous casting, slab heating, rolling, straightening, slow cooling and heat treatment according to the component proportion of the technical scheme
Heating the continuous casting slab to 1150-1180 ℃, preserving heat for 5-6h at the soaking section, wherein the rolling start temperature is 1050-1070 ℃, and the rolling reduction of the first four non-widening passes during the steel plate rolling is more than or equal to 29.5 mm; the finishing temperature is more than or equal to 950 ℃; the offline temperature of the steel plate is 300-400 ℃; after the wire is off, stacking and slowly cooling for 24-36 h;
the heat treatment process adopts a primary tempering process, and specifically comprises the following steps: the tempering temperature is 600 ℃ and 650 ℃, and the temperature is kept for 4-5 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 heat treatment of the steels of the examples of the invention is shown in Table 3. The Rockwell hardness properties of the steels of the examples of the invention are shown in Table 4. The thermal fatigue properties of the steels of the examples of the invention are shown in Table 5. The acid corrosion resistance of the steels of the examples of the invention is shown in Table 6. The cutting properties of the steels of the examples of the invention are shown in Table 7.
TABLE 1 composition (wt%) of steels of examples of the present invention
Examples C Si Mn P S Cr Ni Cu B Cu+B
1 0.30 0.85 1.26 0.015 0.013 13.2 3.7 1.15 0.45 1.6
2 0.35 0.90 1.40 0.010 0.012 13.7 3.5 1.20 0.48 1.68
3 0.38 1.00 1.45 0.013 0.015 14.0 4.0 1.30 0.47 1.77
4 0.28 0.98 1.20 0.011 0.007 13.0 4.2 1.39 0.41 1.8
5 0.37 0.80 1.35 0.009 0.009 13.5 4.5 1.50 0.40 1.9
6 0.32 0.88 1.30 0.007 0.010 13.8 4.3 1.00 0.50 1.5
7 0.29 0.92 1.50 0.012 0.011 13.4 3.9 1.09 0.49 1.58
8 0.33 0.82 1.25 0.014 0.014 13.6 3.8 1.10 0.42 1.52
9 0.34 0.94 1.48 0.008 0.008 13.1 4.1 1.40 0.43 1.83
10 0.36 0.95 1.29 0.010 0.006 13.3 4.4 1.36 0.45 1.81
TABLE 2 Main Process parameters of the steels of the examples of the invention
Figure BDA0002572541530000101
TABLE 3 Heat treatment of steels of examples of the invention
Examples Tempering temperature/. degree.C Holding time/h
1 610 4.1
2 635 4.4
3 650 4
4 600 4.8
5 628 5
6 620 4.9
7 638 4.5
8 630 4.2
9 648 4.7
10 640 4.6
TABLE 4 Rockwell hardness Properties of steels according to examples of the invention
Figure BDA0002572541530000121
TABLE 5 thermal fatigue Properties of inventive example steels
Examples Direction Rm(MPa) A(％) Grade of thermal fatigue
1 Horizontal bar 421 35.6 2
2 Horizontal bar 429 35.1 3
3 Horizontal bar 425 35.0 2
4 Horizontal bar 410 36.0 3
5 Horizontal bar 412 35.9 3
6 Horizontal bar 415 35.5 2
7 Horizontal bar 419 35.7 3
8 Horizontal bar 411 36.2 2
9 Horizontal bar 414 36.1 2
10 Horizontal bar 415 35.8 2
Remarking: test parameters are as follows: the temperature is between room temperature and 500 ℃, and the cycle time is 500cyc
TABLE 6 acid corrosion resistance of steels of examples of the invention
Examples Corrosion rate/g/(m 2. h)
1 2.06
2 2.10
3 1.98
4 1.95
5 2.05
6 2.00
7 2.09
8 2.01
9 1.99
10 1.97
Remarking: test parameters are as follows: soaking at 25 deg.C in 10% hydrochloric acid solution for 36 hr.
TABLE 7 machinability of steels according to examples of the invention
Examples Vibration amplitude/g Flank wear/mm
1 0.29 0.028
2 0.30 0.029
3 0.28 0.026
4 0.27 0.025
5 0.31 0.030
6 0.32 0.027
7 0.29 0.023
8 0.26 0.024
9 0.33 0.031
10 0.34 0.032
In order to express 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. The high-temperature-resistant corrosion-resistant plastic die steel with excellent cutting performance is characterized by comprising the following components in percentage by weight: c: 0.32% -0.38%, Si: 0.80% -0.95%, Mn: 1.2-1.5%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 13.0% -14.0%, Ni: 3.5% -4.5%, Cu: 1.09% -1.5%, B: 0.40% -0.50%, wherein Cu + B =1.5% -1.9%, and the balance of Fe and unavoidable impurities; the preparation method of the high temperature resistant and corrosion resistant plastic die steel comprises the steps of molten iron pretreatment, smelting, LF-RH, continuous casting, slab heating, rolling, straightening, slow cooling and heat treatment;
heating the continuous casting slab to 1150-1180 ℃, preserving heat for 5-6h at the soaking section, wherein the rolling start temperature is 1050-1070 ℃, and the rolling reduction of the first four non-widening passes during the steel plate rolling is more than or equal to 29.5 mm; the finishing temperature is more than or equal to 950 ℃; the offline temperature of the steel plate is 300-400 ℃; after the wire is off, stacking and slowly cooling for 24-36 h;
the heat treatment process adopts a primary tempering process, and specifically comprises the following steps: the tempering temperature is 600 ℃ and 650 ℃, and the temperature is kept for 4-5 h.
2. The high temperature and corrosion resistant plastic die steel with excellent machinability as claimed in claim 1, wherein the die steel plate has a thickness of 11-120 mm; the hardness is 36-39HRC, and the hardness difference of the same plate is less than or equal to 2.5 HRC; the thermal fatigue grade of the die steel from room temperature to 500 ℃ is 2-3.
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