CN109576584A - A kind of hot die steel and preparation method thereof - Google Patents

A kind of hot die steel and preparation method thereof Download PDF

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Publication number
CN109576584A
CN109576584A CN201811579144.1A CN201811579144A CN109576584A CN 109576584 A CN109576584 A CN 109576584A CN 201811579144 A CN201811579144 A CN 201811579144A CN 109576584 A CN109576584 A CN 109576584A
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Prior art keywords
steel
hot die
die steel
surplus
component
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Inventor
冯帆
吴瑞
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Shanghai Shengjie Precision Machinery Science & Technology Co Ltd
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Shanghai Shengjie Precision Machinery Science & Technology Co Ltd
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Priority to CN201811579144.1A priority Critical patent/CN109576584A/en
Publication of CN109576584A publication Critical patent/CN109576584A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The present invention provides a kind of hot die steels, and include following component: C, Si, P, S, Zr, Mo, Mg, surplus are iron family element.Hot die steel of the invention, excellent heat stability, impact flexibility is preferable, and thermal fatigue resistance and harden ability are excellent.

Description

A kind of hot die steel and preparation method thereof
Technical field
The invention belongs to metal material, more specifically a kind of hot die steel and preparation method thereof.
Background technique
Mold is industrial underlying process equipment, in electronics, automobile, motor, electric appliance, instrument, household electrical appliances and communication etc. In product, 60~80% components depend on mold molding, therefore mold is referred to as " mothers of all trades ".With Die & Mould Market by The development in year expands, and material-mould steel dosage of production mould is also dramatically increasing, wherein the consumption of hot die steel steel Account for about 30% or more of Die Steel Products.Hot die steel steel is appropriate to hardness requirement, lays particular emphasis on red hardness, and thermal conductivity is wear-resisting Property.Therefore phosphorus content is low, and alloying element improves wearability, based on red hardness to increase harden ability.It is rapid with mould industry Development, proposes requirements at the higher level to service life, the machining accuracy of hot die steel.Hot die steel Steel Properties quality and make With the length in service life, the economic benefit of the quality and production of converted products will be directly affected.
The hot die steel produced currently on the market there is thermal stability poor, poor impact toughness, thermal fatigue difference Problem, therefore, this field need to develop a kind of better heat stability, and toughness is good, and thermal fatigue and harden ability are excellent Heat makees film tool.
Summary of the invention
In order to solve the above-mentioned technical problem, the first aspect of the present invention provides a kind of hot die steel, comprising such as the following group Point: C, Si, P, S, Zr, Mo, Mg, surplus are iron family element.
As a kind of perferred technical scheme, by weight percentage, include following component:
C 0.40-0.48%, Si 0.17-0.40%, P 0.01-0.02%, S 0.001-0.02%, Zr 1.00- 1.70%, Mo 0.80-1.60%, Mg0.03-0.09%, surplus is iron family element.
As a kind of perferred technical scheme, the iron family element is selected from one of Mn, Cr, V, Y and Fe or a variety of groups It closes.
As a kind of perferred technical scheme, the iron family element is Mn, Cr, V, Y and Fe combination.
As a kind of perferred technical scheme, the weight ratio of described Mn, Cr, V and Y are (0.80-1.20): (1.20- 1.80): (1.20-1.80): (0.02-0.05).
As a kind of perferred technical scheme, by weight percentage, include following component:
C 0.40~0.48%, Si 0.17~0.40%, Mn 0.80~1.20%, P0.01-0.020%, S 0.001- 0.010%, Cr 1.20~1.80%, Zr 1.00~1.70%, Mo 0.80~1.60%, V 1.2~1.8%, Mg0.03~ 0.09%, Y 0.02~0.05%, the Fe of surplus.
As a kind of perferred technical scheme, by weight percentage, include following component:
C 0.42~0.46%, Si 0.21~0.36%, Mn 0.90~1.10%, P 0.012-0.018%, S 0.003-0.007%, Cr 1.40~1.60%, Zr 1.20~1.50%, Mo 1.00~1.40%, V 1.4~1.6%, Mg0.05~0.07%, Y 0.03~0.05%, the Fe of surplus.
As a kind of perferred technical scheme, by weight percentage, include following component:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
In order to solve the above-mentioned technical problem, the second aspect of the present invention provides a kind of preparation method of hot die steel, It comprises the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other, which are placed at 1360~1500 DEG C, melts When refining is to 1/3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7~8 hours, homogenize composition of steel, demoulds Slow cooling is made annealing treatment afterwards;
S3: forging or is rolled into profile: gained Heating Steel Ingots are burnt down to full forging of beginning to 300 DEG C~1150 DEG C and thoroughly;
S4: profile annealing process.
As a kind of perferred technical scheme, the step of profile annealing process are as follows:
It is kept for 60~80 DEG C/h of heating rate and is warming up to 850 DEG C, keep the temperature 8 hours;Cool to 750 DEG C with the furnace, annealing It 8 hours, to remove the stress generated in forging process, finally cools to 500~550 DEG C with the furnace, comes out of the stove air-cooled, surface finish.
The beneficial effects of the present invention are:
Hot die steel of the invention, excellent heat stability, impact flexibility is preferable, and thermal fatigue resistance and harden ability are excellent It is different.
Specific embodiment
Unless otherwise indicated, from context cues or belong to the convention of the prior art, otherwise number all in the application It is all based on weight with percentage, and test and characterizing method used is all synchronous with the submission date of the application.If existing There is defining for the concrete term disclosed in technology inconsistent with any definition provided herein, then with provided herein Subject to term definition.
It is further clear, complete that the technical characteristic work in technical solution is provided to the present invention With reference to embodiment Description, not to the limitation of its protection scope.
Word " preferred ", " preferably ", " preferred " in the present invention etc. refer to, can provide certain in some cases The embodiment of the present invention of a little beneficial effects.However, other embodiments may also under identical circumstances or in the case of other It is preferred.In addition, not implying that other embodiments are unavailable to the statement of one or more preferred embodiments, it is not yet It is intended to exclude other embodiments except the scope of the present invention.The content not referred in detail in the present invention is existing skill Art.
In order to solve the above-mentioned technical problem, the first aspect of the present invention provides a kind of hot die steel, comprising such as the following group Point:
C, Si, P, S, Zr, Mo, Mg, surplus are iron family element.
Wherein the C, Si, P, S, Zr, Mo, Mg refer both to element, and Mn, Cr, V, Y and the Fe that appear below also refer both to member Element.
In a particular embodiment, by weight percentage, include following component:
C 0.40-0.48%, Si 0.17-0.40%, P 0.01-0.02%, S 0.001-0.02%, Zr 1.00- 1.70%, Mo 0.80-1.60%, Mg0.03-0.09%, surplus is iron family element.
In a particular embodiment, the iron family element is selected from one of Mn, Cr, V, Y and Fe or multiple combinations.
In a particular embodiment, the iron family element is Mn, Cr, V, Y and Fe combination.
In a particular embodiment, the weight ratio of described Mn, Cr, V and Y are (0.80-1.20): (1.20-1.80): (1.20-1.80): (0.02-0.05).
In a preferred embodiment, the weight ratio of described Mn, Cr, V and Y are (0.90-1.10): (1.40-1.60): (1.30-1.70): (0.03-0.04).
In further preferred embodiment, the weight ratio of described Mn, Cr, V and Y are 1.0:1.5:1.5:0.04.
In a particular embodiment, by weight percentage, include following component:
C 0.40~0.48%, Si 0.17~0.40%, Mn 0.80~1.20%, P0.01-0.020%, S 0.001- 0.010%, Cr 1.20~1.80%, Zr 1.00~1.70%, Mo 0.80~1.60%, V 1.2~1.8%, Mg0.03~ 0.09%, Y 0.02~0.05%, the Fe of surplus.
It in a preferred embodiment, by weight percentage, include following component: C 0.42~0.46%, Si 0.21 ~0.36%, Mn 0.90~1.10%, P 0.012-0.018%, S 0.003-0.007%, Cr 1.40~1.60%, Zr 1.20~1.50%, Mo 1.00~1.40%, V 1.4~1.6%, Mg0.05~0.07%, Y 0.03~0.05%, surplus Fe.
Include following component by weight percentage in preferred embodiment:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
It has been found that the thermal stability of product is best when controlling Zr 1.40%, Mg 0.06% and Y 0.04%, Impact flexibility is best, and thermal fatigue resistance is had excellent performance and harden ability performance is best.Possible reason is Zr segregation to crystal boundary, is subtracted Few grain boundary defects, improve crystal boundary binding force, and reducing grain boundary decision rate to slow down dislocation climb can effectively stop high temperature Crystal grain is grown up when heating, and a small amount of be added can inhibit crystal grain to grow up, to improve obdurability, effectively increases steel entirety mechanical property The homogeneity of energy, reduces deformation and the cracking of steel.If being added excessively, it is easy to generate more big during solidification of molten steel Grain pseudoeutectic carbide, seriously damages toughness.Therefore the content of zirconium is preferably 1.00~1.70%.
The solid solubility temperature of solution treatment can be improved in magnesium, to ensure that most alloying elements dissolve in Ovshinsky at high temperature Body increases the precipitating reinforcing effect of ageing treatment.Meanwhile magnesium reduces crystal boundary energy and phase boundary energy in crystal boundary segregation, improves and thin Change grain boundary carbide and the state of other Grain Boundary Precipitates, objectionable impurities is made to form the compound Mg S etc. of low melting point, purification is brilliant Boundary.Further, since Mg has burning tendency, and V reduces the effect of Mg, and Mg can reduce carbon activity, makes the good VC of stability Molten point reduces, so that VC more can also dissolve under hardening heat, steel is made to obtain preferable harden ability and temper resistance.Cause This, the content of magnesium is preferably 0.03%-0.09%, and the content of V is then at least 1.2% or more.
To solve the above-mentioned problems, the second aspect of the present invention provides a kind of preparation method of hot die steel.
In a particular embodiment, the preparation method of the hot die steel, comprises the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other, which are placed at 1360~1500 DEG C, melts When refining is to 1/3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7~8 hours, homogenize composition of steel, demoulds Slow cooling is made annealing treatment afterwards;
S3: forging or is rolled into profile: gained Heating Steel Ingots burn down to full forging of beginning to 300 DEG C~1150 DEG C and thoroughly, 900 DEG C It is calcined again;
S4: profile annealing process.
In a preferred embodiment, the preparation method of the hot die steel, comprises the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other, which are placed at 1400~1450 DEG C, melts When refining is to 1/3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7.5 hours, homogenize composition of steel, after demoulding Slow cooling is made annealing treatment;
S3: forging or is rolled into profile: gained Heating Steel Ingots are burnt down to full forging of beginning to 700 DEG C and thoroughly;
S4: profile annealing process.
In a particular embodiment, the step of profile annealing process are as follows:
It is kept for 60~80 DEG C/h of heating rate and is warming up to 850 DEG C, keep the temperature 8 hours;Cool to 750 DEG C with the furnace, annealing It 8 hours, to remove the stress generated in forging process, finally cools to 500~550 DEG C with the furnace, comes out of the stove air-cooled, surface finish.
In a preferred embodiment, the step of profile annealing process are as follows:
It is kept for 70 DEG C/h of heating rate and is warming up to 850 DEG C, keep the temperature 8 hours;Cool to 750 DEG C with the furnace, annealing 8 is small When, it to remove the stress generated in forging process, finally cools to 520 DEG C with the furnace, comes out of the stove air-cooled, surface finish.
Illustrated below with specific embodiment.
Embodiment
Embodiment 1
The first aspect of embodiment 1 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
The second aspect of embodiment 1 provides a kind of preparation method of hot die steel, comprises the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other are placed at 1425 DEG C melting to 1/ When 3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7.5 hours, homogenize composition of steel, after demoulding Slow cooling is made annealing treatment;
S3: forging or is rolled into profile: gained Heating Steel Ingots are burnt down to full forging of beginning to 700 DEG C and thoroughly;
S4: it profile annealing process: is kept for 70 DEG C/h of heating rate and is warming up to 850 DEG C, keep the temperature 8 hours;With furnace 750 DEG C are cooled to, anneals 8 hours, to remove the stress generated in forging process, finally cools to 520 DEG C with the furnace, sky of coming out of the stove It is cold, surface finish.
Embodiment 2
The first aspect of embodiment 2 provides a kind of hot die steel, includes following component by weight percentage:
C 0.40%, Si 0.17%, Mn 0.80%, P0.01%, S 0.001%, Cr 1.20%, Zr 1.00%, Mo 0.80%, V 1.2%, Mg0.03%, Y 0.02%, the Fe of surplus.
The second aspect of embodiment 2 provides a kind of preparation method of hot die steel, preparation step and 1 phase of embodiment Together.
Embodiment 3
The first aspect of embodiment 3 provides a kind of hot die steel, includes following component by weight percentage:
C 0.48%, Si 0.40%, Mn 1.20%, P 0.020%, S 0.010%, Cr 1.80%, Zr 1.70%, Mo 1.60%, V 1.8%, Mg 0.09%, Y 0.05%, the Fe of surplus.
The second aspect of embodiment 3 provides a kind of preparation method of hot die steel, preparation step and 1 phase of embodiment Together.
Embodiment 4
The first aspect of embodiment 4 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, the Fe of surplus.
The second aspect of embodiment 4 provides a kind of preparation method of hot die steel, and preparation step is the same as embodiment 1.
Embodiment 5
The first aspect of embodiment 5 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.15%, P 0.015%, S 0.005%, Cr 1.20%, Zr 1.40%, Mo 1.20%, V 1.3%, Mg0.06%, Y 0.03%, the Fe of surplus.
The second aspect of embodiment 5 provides a kind of preparation method of hot die steel, and preparation step is the same as embodiment 1.
Embodiment 6
The first aspect of embodiment 6 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
The second aspect of embodiment 6 provides a kind of preparation method of hot die steel, and the preparation method is the same as that of Example 1.
Embodiment 7
The first aspect of embodiment 7 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.26%, Y 0.04%, the Fe of surplus.
The second aspect of embodiment 7 provides a kind of preparation method of hot die steel, and the preparation method is the same as that of Example 1.
Embodiment 8
The first aspect of embodiment 8 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 3.0%, Mg0.06%, Y 0.04%, the Fe of surplus.
The second aspect of embodiment 8 provides a kind of preparation method of hot die steel, and the preparation method is the same as that of Example 1.
Embodiment 9
The first aspect of embodiment 9 provides a kind of hot die steel, includes following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
The second aspect of embodiment 9 provides a kind of preparation method of hot die steel, comprises the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other are placed at 1425 DEG C melting to 1/ When 3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7.5 hours, homogenize composition of steel, after demoulding Slow cooling is made annealing treatment;
S3: forging or is rolled into profile: gained Heating Steel Ingots are burnt down to full forging of beginning to 500 DEG C and thoroughly;
S4: it profile annealing process: is kept for 50 DEG C/h of heating rate and is warming up to 900 DEG C, keep the temperature 6 hours;With furnace 500 DEG C are cooled to, anneals 6 hours, to remove the stress generated in forging process, finally cools to 450 DEG C with the furnace, sky of coming out of the stove It is cold, surface finish.
Performance evaluation test
1) impact flexibility
It will be tested for the property, impact according to formula and the preparation-obtained product of technique provided by embodiment 1-9 Toughness is tested by GB2106, and test result is shown in Table 1.
Table 1
Embodiment 1 2 3 4 5
Impact flexibility/(J/cm2) 0.406 0.403 0.402 0.29 0.31
Embodiment 6 7 8 9
Impact flexibility/(J/cm2) 0.25 0.28 0.27 0.35
2) heat stability testing
By the preparation-obtained hot die steel of above-described embodiment 1-9,30*30*20mm sample is sampled, is kept the temperature at 1100 DEG C 30min, oil is cold, is tempered twice at 650 DEG C, is tempered 2h every time, and final tempering hardness is 48HRC.By sample in 550 DEG C of heat preservation 1- 100h obtains the hardness under different soaking times.Test result is shown in Table 2.
Table 2
3) hot fatigue performance test
In 25-700 DEG C of progress cold cycling, after 3000 cold cyclings, the obtained Forming Die of comparative example 1 Have steel and the obtained hot die steel of embodiment 6 carries out heat fatigue surface and section hardness gradient, after 3000 circulations, The surface of hot die steel clean mark of embodiment 1, no significant change;The obtained surface of hot die steel of embodiment 6 occurs Crackle.
It may be noted that the foregoing is merely the preferable specific embodiments of the present invention, but protection scope of the present invention is not Be confined to this, anyone skilled in the art in the technical scope disclosed by the present invention, the variation that can readily occur in or Replacement, should be covered by the protection scope of the present invention.The scheme as employed in embodiment 1 can also be used for moisturizing face cream or In essence, therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims (10)

1. a kind of hot die steel, which is characterized in that include following component:
C, Si, P, S, Zr, Mo, Mg, surplus are iron family element.
2. hot die steel described in claim 1, which is characterized in that include following component by weight percentage:
C 0.40-0.48%, Si 0.17-0.40%, P 0.01-0.02%, S 0.001-0.02%, Zr 1.00-1.70%, Mo 0.80-1.60%, Mg0.03-0.09%, surplus is iron family element.
3. hot die steel described in claim 1, which is characterized in that the iron family element is in Mn, Cr, V, Y and Fe One or more combinations.
4. hot die steel as claimed in claim 3, which is characterized in that the iron family element is Mn, Cr, V, Y and Fe combination.
5. hot die steel as claimed in claim 4, which is characterized in that the weight ratio of described Mn, Cr, V and Y are (0.80- 1.20): (1.20-1.80): (1.20-1.80): (0.02-0.05).
6. hot die steel described in claim 1, which is characterized in that include following component by weight percentage:
C 0.40~0.48%, Si 0.17~0.40%, Mn 0.80~1.20%, P0.01-0.020%, S 0.001- 0.010%, Cr 1.20~1.80%, Zr 1.00~1.70%, Mo 0.80~1.60%, V 1.2~1.8%, Mg0.03~ 0.09%, Y 0.02~0.05%, the Fe of surplus.
7. hot die steel described in claim 1, which is characterized in that include following component by weight percentage:
C 0.42~0.46%, Si 0.21~0.36%, Mn 0.90~1.10%, P 0.012-0.018%, S 0.003- 0.007%, Cr 1.40~1.60%, Zr 1.20~1.50%, Mo 1.00~1.40%, V 1.4~1.6%, Mg0.05~ 0.07%, Y 0.03~0.05%, the Fe of surplus.
8. hot die steel described in claim 1, which is characterized in that include following component by weight percentage:
C 0.44%, Si 0.28%, Mn 0.10%, P 0.015%, S 0.005%, Cr 1.50%, Zr 1.40%, Mo 1.20%, V 1.5%, Mg0.06%, Y 0.04%, the Fe of surplus.
9. the preparation method of the described in any item hot die steels of claim 1-8, which is characterized in that comprise the following steps:
S1: smelting process: melting weighs the raw material of formula ratio, removes Cr and Mo, other are placed at 1360~1500 DEG C melting extremely When 1/3, the Cr and Mo for being put into formula ratio continue melting and form molten steel;
S2: molten steel casts steel ingot: ingot mould preheating injects molten steel, keeps the temperature 7~8 hours, homogenize composition of steel, delays after demoulding Slow cool down is made annealing treatment;
S3: forging or is rolled into profile: gained Heating Steel Ingots are burnt down to full forging of beginning to 300 DEG C~1150 DEG C and thoroughly;
S4: profile annealing process.
10. the preparation method of hot die steel as claimed in claim 9, which is characterized in that the profile annealing process Step are as follows:
It is kept for 60~80 DEG C/h of heating rate and is warming up to 850 DEG C, keep the temperature 8 hours;Cool to 750 DEG C with the furnace, annealing 8 is small When, it to remove the stress generated in forging process, finally cools to 500~550 DEG C with the furnace, comes out of the stove air-cooled, surface finish.
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CN110116134A (en) * 2019-05-10 2019-08-13 舞阳钢铁有限责任公司 The production technology of big substance super-thick steel plate forging base
CN110616373A (en) * 2019-09-29 2019-12-27 舞阳钢铁有限责任公司 Hot-work die steel plate and production method thereof

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