CN106435353B - A kind of Cr5 series hot die steel - Google Patents
A kind of Cr5 series hot die steel Download PDFInfo
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- CN106435353B CN106435353B CN201610717357.0A CN201610717357A CN106435353B CN 106435353 B CN106435353 B CN 106435353B CN 201610717357 A CN201610717357 A CN 201610717357A CN 106435353 B CN106435353 B CN 106435353B
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- 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
- C21D1/32—Soft annealing, e.g. spheroidising
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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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The present invention provides a kind of Cr5 series hot die steel, and the hot die steel is in terms of weight %, including C 0.40~0.48%, Si 0.20~1.2%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr 4.80~5.50%, Ni 1.40~2.0%, Mo 0.80~1.50%, V 0.50~0.70%, W 0.50 1.00%, Co 0~0.75%, Al 0.01~0.20%, Nb 0.02~0.20%, the Fe of surplus.The chemical composition formula of novel C r5 series hot die steels proposed by the present invention, it is denoted as YB5 series, compared with existing Cr5 systems (H13) hot die steel, YB5 Series Die Steels improve carbon content, Mn contents are improved, Si silicone contents (YB5A, YB5C) is reduced, reduces Mo contents, V content is reduced, Ni elements is added to, is added to W elements, is added to Co elements (YB5C), is added to Al elements (YB5A, YB5C).To improve the toughness of steel, elevated temperature strength and creep-resistant property etc. are improved.
Description
Technical field
The invention belongs to ferrous alloy fields, and in particular to a kind of for the alloy of forging mold and its preparation and application.
Background technology
Mold is the main technique equipment of die forging, and the service life directly affects the quality, cost and efficiency of forging.Forging die expense
Account for 30%~45% (note of forging cost:Because forging batch is small, therefore forging die cost accounting is big).Due to forging high-temperature alloy mold
Service condition is poor, and mold cavity bears prodigious impact force, and the long period is in 550 DEG C or more of hot environment, and mold becomes
Shape is worn, the angle and to collapse problem ratio more serious of collapsing.
5CrNiMo and 5CrNiMoV is major die material (GB/T11880-89 die hammers and large size in current industrial
Mechanical forging press building block technique condition)；GB1299-2000 alloy tool steels；《China's hot die steel performance data collection》, Zhu
Zong Yuan, mechanical engineering material, the 12nd phase of volume 25, P12).Wherein 5CrNiMo mould steel heat resistance and wearability are poor, mold
It should not be chronically at 500 DEG C or more of hot environment, for example on 4000t forging equipments, 5CrNiMo mould steel uses have no different
Often, but the die wear in 1.8 ten thousand tons and 3.55 ten thousand tons big hammering equipment, the angle and to collapse problem then more serious of collapsing.
5CrNiMoV is the large-scale hammering mold materials for starting for 2013 to promote and apply, 5CrNiMoV mould steel heat resistance and wearability phase
To preferable, the needs of blade process of steel forging dies can be met substantially, but mold should not be chronically at 550 DEG C or more of hot environment.
JBD275 is the technique diskware that GH4169 alloy direct agings obtain, and can be produced in enormous quantities, the technique diskware mould
The deformation of mold center portion is serious when forging, forging appearance and size and product inherent quality has been seriously affected, to the high efficiency production of product
Larger challenge is brought with batch stability.Solve the problems, such as that die deformation has become the task of top priority of diskware forging.
China's forging mold materials are of less types, using it is most be 5CrNiMo in GB/T11880-89,
5CrNiMoV、4Cr2MoVNi(B2)；H13 in GB/T1299-2000；Foundation is weighed using hardness in these kinds, high
Height, low is low, lacks the kind of middle hardness, and the 5Cr2NiMoVSi in GB/T11880-89 belongs to the moderate kind of hardness, but
Because brittleness is big, it is easy to crack, application is not extensive.Therefore alloying need to be developed and hardness is among 5CrNiMo and H13 or is higher than
The series of products of H13.5CrNiMo is national standard Die Steel Products, is suitable for using hardness HRC42-47 (small-sized), HRC39-44
The steel of (middle-size and small-size), HRC37-42 (medium-sized), (《Mold materials application manual》, Lin Huiguo, fire tree roc, Ma Shao are more edited, mechanical
Industrial publishing house's second edition, P14, P32), purposes simple shape, thickness 250-350mm.The steel alloying is relatively reasonable, is forging
Application effect is preferable when making resistance of deformation small low-alloy steel.If when for the hot-forging die of bigger section or higher temperature, this
For kind steel since quenching degree and hardenability are low, thermal stability is poor, and causes the service life of mold low.
H13 (4Cr5MoSiV1) is the most widely used high-alloy hot work mould steel in the world, and purposes has cavity complexity, bears
The larger hammer forging die of shock loading, the unitary mould or insert on forging press and hot extrusion mould, hot-cutting die, compression mod
Deng, have higher thermohardening and wearability (《The application of H13 mould steel and development》, Li Caiwen, Wang Mengjun, military star, China
Material science and technology and equipment, 2009, the 4th phase).H13 steel originals are a steel grades in the U.S., and 4Cr5MoSiV1 is commonly referred to as in China
Steel.Hot die steel requires material to have high quenching degree, high elevated temperature strength, high wearability, high toughness, high heat resistanceheat resistant
Split ability and high resistance to melting loss performance etc..Why H13 steel is widely used, and is because it has following characteristic：1. with height
Quenching degree and high toughness；2. excellent thermal crack resistant ability can give water cooling in workplace；3. with medium wear-resisting
Property, carburizing or nitridation process can be used to improve its case hardness；4. having anti-softening ability at relatively high temperatures；5. being heat-treated
It deforms small；6. good machinability.The shortcomings that H13, is to be not suitable for manufacturing large and medium-sized, large-scale and ultra-large type mold, easily
In cracking.Big section hot die steel is developed in native land.
That forges and presses thickness >=350~500mm of module is known as heavy die block, the super-huge module of title of thickness >=500mm.I
State develops 45Cr2NiMoVSi (45Cr2), 5Cr2NiMoVSi (5Cr2), 3Cr2MoVNi (B2) and 3Cr2MoWVNi (B3)
(JBT8431-1996《Hot forging forming mould steel and its heat treatment technics condition》) etc. big section hot die steel, with 5CrNiMo
It compares, 45Cr2 and 5Cr2 steel improves quenching degree, elevated temperature strength, thermal stability, and impact flexibility is suitable, heat wear resistance and anti-
The performance of heat fatigue is also better than 5CrNiMo, (《Mold materials application manual》, Lin Huiguo, fire set roc, Ma Shao is more edited, mechanic
The industry publishing house second edition, P410).But 45Cr2 and 5Cr2 are easy to crack.
Invention content
For this field there are the problem of, it is an object of the present invention to provide one kind be suitable for heavy die block and super-huge module Cr5
Serial hot die steel.
Second object of the present invention is to propose the preparation method of the Cr5 series hot die steel.
Third object of the present invention is the method for proposing to prepare mold with the Cr5 series hot die steel.
Realize that the specific technical solution of above-mentioned purpose of the present invention is：
A kind of Cr5 series hot die steel, which is characterized in that the hot die steel in terms of weight %, including C0.40~
0.48%, Si 0.20~1.2%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr4.80~5.50%, Ni
1.40~2.0%, Mo0.80~1.50%, V0.50~0.70%, W0.50-1.00%, Co 0~0.75%, Al0.01~
0.20%, Nb 0.02~0.20%, the Fe of surplus；
The preparation method of the novel C r5 series hot die steels, including step：
Electric furnace or converter smelting, LF stoves refine (LADLE FURNACE, that is, ladle refining furnace), vacuum outgas (VD), molding,
Annealing, electroslag remelting (ESR), slow cooling are annealed, forging, normalizing, spheroidizing, and expansion hydrogen slightly plus, is examined, thick to add, quenched, smart
Add, examines.Operation obtains module or mold.
In the prior art, the main alloy element of hot die steel and ranging from:C0.26-0.75%, Si0.10-
1.2%, Mn0.20-1.60%, Cr0.5-5.5%, Mo0-3.4%, W0-7.9%, V0-1.4%, Ni0-4.3%, Co0-
4.5%, AL0-0.7%, Nb0-0.3%, the variation of each component content to the tissue and performance of steel play beneficial effect and
Unfavorable effect, the present invention take the normal place of each element, evade its weakness, and the aspect that emphasis considers is as follows：
1) effects of the C in steel
Expand γ phase regions, but because of the formation of cementite, cannot infinitely be dissolved；With the increase of content, improve steel hardness and
Intensity, but reduce its plasticity and toughness.Improve the quenching degree of steel；
To improve the wearability of steel, steel should be made to obtain martensite+alloy carbide tissue, the steel containing chromium 5%, 870 DEG C of Austria
When family name's body, in austenite A and A+M3C+M7C3 intersection, phosphorus content 0.4-0.5%, therefore the phosphorus content of 0.4-0.5% is selected,
It is maintained in the level to form a certain amount of alloy carbide,
Ms points are reduced, therefore keep relatively low carbon content, so that the Ms of steel is taken at relatively high level, Ms340 DEG C, quenches
Martensite+residual A+C, and tempered rear acquisition uniform martensitic structure are obtained when fiery, obtain lath martensite+a small amount of sheet M+
A small amount of remnants A.
Therefore steel grade of the present invention takes C0.40~0.48%.
2) effect of the silicon in steel:
(1) improving the intensity and cold work hardening degree of solid solution in steel makes the toughness of steel and plasticity reduce.
(2) Si, which is the effective element .Si of raising resistance to tempering, reduces diffusion velocity of the carbon in ferrite, and tempering is made to be precipitated
Carbide be not easy to assemble, increase temper resistance；
(3) high-temperature oxidation resistance of steel is improved；
(4) unfavorable aspect easily makes steel that banded structure be presented, and the lateral performance of steel is made to reduce
The development trend of Cr5 Series Die Steels is developed to the directions low Si high Mo at present.The detrimental effect of Si mainly increases
Biasing is analysed, and eutectic carbide is increased.Therefore Si takes 0.20~0.40% satisfaction to smelt deoxidation demand water in YB5A, YB5C of the present invention
Flat, wherein YB5B is that high Si takes 0.40~1.0%, mainly utilize its improve intensity, it is anti-oxidant, improve temper brittleness temperature
Effect, unfavorable effect can be by taking smelting and heating process measure to be controlled.YB5B can be used for manufacturing low impact
The mold of power.
Therefore steel grade of the present invention takes Si0.20~0.40% and 0.40~1.0% two kind of level.
3) effect of the manganese in steel
(1) manganese improves the quenching degree of steel.
(2) manganese and iron form solid solution, improve the hardness and strength of ferrite and austenite in steel, and Mn can form carbonization again
Object, to improve the intensity, hardness and wearability of steel.
(3) manganese increases to the high-temperature instantaneous intensity of steel.
(4) manganese reduces the Ms points of steel strongly, increases the remained austenite content in hardened steel, advantageous aspect can be improved tough
Property, it can disadvantageously increase deflection；
The major defect of manganese steel is that when 1. higher containing manganese, there is obvious temper brittleness phenomenon；Promote crystal grain long 2. manganese has
Big effect, therefore manganese steel is more sensitive to overheating, therefore must be noted that in heat treatment process.This disadvantage, which can be used, is added refinement crystalline substance
Grain element such as molybdenum, vanadium, titanium etc. overcomes.
Mn is good deoxidier and desulfurizing agent, and Mn must reach a certain amount in steel, and Mn/S has to be larger than equal to 8.
Therefore invention steel grade Mn takes 0.40~0.80%.
4) effect of the chromium in steel
(1) intensity and hardness of steel can be improved in chromium.(2) high-temperature mechanical property of steel can be improved in chromium.(3) steel is made to have good
Corrosion resistance and inoxidizability.(4) graphitization is prevented.(5) quenching degree is improved.(6) carbide is formed, wearability is improved.(7)
Increase temper resistance.
It when the chromium of ＜ 6% is added, improves a lot to the tempering resistance of steel, but inenough at post-curing, as chromium ＞
When 6%, at 550 DEG C, tempering will appear post-curing effect to steel after quenching, and old friends generally select hot die steel 5% chromium
Addition.
Influences and Mn of the Cr to steel eutectoid point are substantially similar, and in about 5% chrome content, the C content of eutectoid point drops to
0.5% or so.In addition the addition of Si ﹑ W ﹑ Mo ﹑ V more significantly reduces eutectoid point C content.Thus it is known that：4Cr5 series of heat is made
Mould steel belongs to hypereutectoid steel.The reduction of eutectoid C content is organized to neutralize the alloy carbon in last tissue after increasing austenitizing
Compound content.
Disadvantage：1. chromium is to significantly improve the brittle transition temperature of steel 2. chromium can promote steel belt roof bolt brittleness.
Therefore steel grade Cr of the present invention takes 4.80~5.50%.
5) effect of the nickel in steel
(1) intensity of steel can be improved, and improve its toughness, improve fatigue resistance.(2) nickel can reduce the Transition of Brittleness temperature of steel
Degree, you can improve the low-temperature flexibility of steel.(3) nickel can improve the resistance to corrosion of steel, can not only be acidproof, and can alkali resistant and big
The corrosion of gas.(4) quenching degree is improved, (5) expand austenitic area, increase the remained austenite content in hardened steel, advantageous aspect
Toughness can be improved, can disadvantageously increase deflection；(6) increase dendrite, improve lateral performance；(7) increase lath-shaped horse
Family name's scale of construction improves toughness；(8) it is non-carbide formation element to accelerate diffusion of the carbon in austenite, Ni, improves carbon in austenite
In diffusion coefficient, reduce primary carbide, and proeutectoid carbide is made to be not easy to grow up.(9) Ni, which makes the layer of austenite arrange, to carry
It is high.It is generally acknowledged that arrange can be lower for layer, be more conducive to extension that position is arranged and form position to arrange, keeps sliding difficult, cause the processing of steel hard
Change trend increases.Otherwise layer is arranged can be higher, more easily deformable processing.This can increase forging pass deformation, and it is broken to be conducive to tissue
Broken and loose soldering.
Therefore steel grade Ni of the present invention takes 1.40~2.0%.
6) effect of the molybdenum in steel
(1) molybdenum has solution strengthening effect to ferrite.(2) steel heat resistance is improved, elevated temperature strength is improved.It keeps at high temperature
Enough intensity and creep resisting ability (be stressed, deform at high temperature for a long time, claim creep).(3) crystal grain thinning improves
Toughness.(4) quenching degree of steel is improved.(5) play the role of post-curing, addition is not less than 1%, highest 3%.(6) carbon is formed
Compound improves wearability.(7) increase temper resistance.(8) it can inhibit steel belt roof bolt brittleness.
Disadvantage：The main ill-effect of molybdenum, which is it, can make low-alloy molybdenum steel that graphited tendency occur.
Therefore steel grade Mo of the present invention takes 0.80~1.50%.
7) effect of the vanadium in steel
(1) steel heat resistance is improved.(2) crystal grain thinning.(3) play the role of post-curing, (4) form carbide, improve resistance to
Mill property.Disadvantage：V high forms primary carbide, and solution temperature is high, not readily dissolves, to reduce toughness.
Therefore steel grade V of the present invention takes 0.50~0.70%.
8) effect of the tungsten in steel
(1) increase temper resistance；(2) increase red hardness；(3) increase heat resistance, improve the binding force of atom, improve and expand
Activation energy and activation energy of creep are dissipated, the stability and creep resistance of tissue are improved.(4) carbide is formed, wearability is improved；(5)
Play the role of post-curing, (6) improve quenching degree, can inhibit steel belt roof bolt brittleness.
Therefore steel grade W of the present invention takes 0.50~1.00%.
9) effect of the aluminium in steel
(1) reinforced ferrite；(2) high temperature hardness is improved；(3) solid solution strength is improved；(4) crystal grain thinning；(5) Ms is improved
Point increases lath M.(6) it is non-carbide formation element, the activity of carbon can be improved, improves Carbon diffusion coefficient, make secondary carbonization
Object is not easy to grow up.
Therefore steel grade Al of the present invention takes 0.01~0.04% and 0.06~0.20% two kind of level.
10) effect of the cobalt in steel
Cobalt is non-carbide formation element in steel, and when Quench heating is dissolved in austenite, and martensite is present in after quenching
In, the anti-temper resistance of martensite is improved, secondary hardening effect is strengthened, there is preferable thermohardening.Cobalt and tungsten, molybdenum are former
The binding force of son is strong, can lower the diffusion velocity of tungsten, molybdenum atom, slows down alloy carbide precipitation and agglomeration, increases heat
Hardness.It disadvantageously has reduction toughness, reduces quenching degree.
Therefore steel grade Co of the present invention takes 0.00~0.20% and 0.50~0.75% two kind of level.
11) effect of the niobium in steel
Nb and C, N, O have extremely strong affinity, form extremely stable compound therewith, improve the hardness of steel.Simultaneously more
Scattered compound can improve the Coarsening Temperature of crystal grain with crystal grain thinning, reduce the superheated susceptivity and temper brittleness of steel.
Therefore steel grade Nb of the present invention takes 0.020~0.2% level.
12) other elements and gas content：Cu：Carbide is not formed, is present in matrix with being dissolved state, steel can be improved
Toughness improves quenching degree and corrosion resistance.But the disadvantage is that increase steel red brittleness, therefore its content control in≤0.20% water
It is flat.Ti：For carbide former, can crystal grain thinning, similar with the effect of V, Nb, due to being added to V and Nb, therefore Ti does not add
Add, should control in≤0.01% level.P, S, Pb, Sn, As, Sb, Bi and gas content N, H, O are harmful element, should all be controlled
System is better in reduced levels, and more lower.
Specifically, the hot die steel is in terms of weight %, including C0.40~0.48%, Si 0.20~0.40%, Mn
0.40~0.80%, P≤0.020%, S≤0.010%, Cr4.80~5.50%, Ni1.40~2.0%, Mo0.80~
1.50%, V0.50~0.70%, W0.50-1.00%, Al0.06~0.20%, Nb0.02~0.20%, the Fe of surplus.It is this
Steel is denoted as YB5A, and Si is low in composition, and toughness is high.
Or, the hot die steel is in terms of weight %, including C0.40~0.48%, Si 0.40~1.0%, Mn 0.40
~0.80%, P≤0.020%, S≤0.010%, Cr4.80~5.50%, Ni1.40~2.0%, Mo0.80~1.50%,
V0.50~0.70%, W0.50-1.00%, Al0.01~0.04%, Nb0.02~0.20%, the iron of surplus.This steel is denoted as
YB5B, Si higher in composition, hardness are slightly higher.
Or, the hot die steel is in terms of weight %, including C0.40~0.48%, Si 0.20~0.40%, Mn 0.40
~0.80%, P≤0.020%, S≤0.010%, Cr4.80~5.50%, Ni1.40~2.0%, Mo0.80~1.50%,
V0.50~0.70%, W0.50-1.00%, Co 0.50~0.75%, Al0.06~0.20%, Nb0.02~0.20%, surplus
Iron.This steel is denoted as YB5C, and Co is contained in composition, and anti-temper resistance height and heat resistance are high.
A kind of preparation method of alloy mold, the alloy mold are high temperature alloy mold, blade steel mold and low-alloy
One kind in steel mold, with hot-work die steel making of the present invention, including step：
S1 is quenched：≤ 650 DEG C of shove charges, isothermal at a temperature of being maintained at 650 DEG C are warming up to 800~820 DEG C of isothermals with stove, etc.
The warm time is calculated by the effective dimensions 0.6min/mm of workpiece, then is warming up to 1000~1020 DEG C with stove, is kept for 10~12 hours,
Oil cooling be cooled to 150~180 DEG C it is fuel-displaced after be tempered immediately；
S2 is once tempered：≤ 280 DEG C of shove charges, 4~10h of isothermal at a temperature of being maintained at 280 DEG C, are warming up to 570~595 DEG C,
14~22h of holding (such as 570~580 DEG C of diskware/holding 15h；585~595 DEG C of blade/holding 21h.550 DEG C or less hardness
High, brittleness it is big cannot use this temperature below), oil cooling is cooled to air-cooled after 100~150 DEG C of surface temperature (can not water cooling), goes out
When oil is air-cooled, it is ensured that mold could carry out second of tempering after being cooled to room temperature；
S3 double temperings：≤ 300 DEG C enter stove, and 560 DEG C of diskware keeps 580 DEG C of holding 18h of 12h or blade, is air-cooled to 100
DEG C or less.
The effective dimensions of workpiece is also known as equivalent size, for round piece, can refer to its diameter, for square cross, refers to it
Thickness, cake part, workpiece etc. with holes can be looked into depending on heat treatment handbook.Time involved in the present invention is measured with "/mm ", is
Refer to based on the effective dimensions of workpiece.
Specifically, the alloy mold is high temperature alloy mold or blade steel mold, preparation method further include：
S4 is tempered three times：≤ 300 DEG C enter stove, and 580 DEG C of temperature keep 1.8min/mm (conjunction is tied this step and can be omitted).Diskware
560 DEG C of holding 10h, 580 DEG C of holding 16h of blade, the air-cooled room temperature that is cooled to carry out Rockwell hardness detection.
Wherein, in step sl, isothermal 0.6min/mm at a temperature of being maintained at 650 DEG C is warming up to 800~820 DEG C of guarantors with stove
0.6min/mm is held, then is warming up to 1000~1020 DEG C with stove and keeps 1.0~1.2min/mm (such as diskware 12h, blade 10h)；
High temperature alloy mold 80~90min of (diskware) oil cooling or blade 120~130min of oil cooling, be cooled to 150~180 DEG C it is fuel-displaced after
It is tempered immediately；
In step s 2, diskware keeps diskware 15h or blade to be kept in 585-595 DEG C of temperature in 570~580 DEG C of temperature
21h, oil cooling be cooled to it is air-cooled after 100~150 DEG C of surface temperature, when fuel-displaced air-cooled, it is ensured that mold could carry out after being cooled to room temperature
The double tempering of S3；
In step s3,560 DEG C of temperature of diskware keep diskware 12h or blade to keep 18h at 580 DEG C, are air-cooled to 100 DEG C
Third time tempering is carried out below；
In step s 4,560 DEG C of temperature of diskware keep 580 DEG C of holding 16h of 10h or blade.
Preferably, in step sl, isothermal 0.6min/mm at a temperature of being maintained at 650 DEG C is warming up to 820 DEG C of holdings with stove
0.6min/mm, then with stove be warming up to 1000~1020 DEG C holding 1.0~1.2min, oil cooling (according to block size determine, such as
120~130min of oil cooling blade), be cooled to 150~180 DEG C it is fuel-displaced after be tempered immediately；
In step s 2,2.4~3.0min/mm are kept in 585~595 DEG C of temperature, oil cooling be cooled to surface temperature 100~
It is air-cooled after 150 DEG C, when fuel-displaced air-cooled, it is ensured that mold is cooled to the double tempering for carrying out S3 after room temperature；
In step s3,580 DEG C of temperature keep 1.8~2.4min/mm, are air-cooled to 100 DEG C or less progress third time tempering.
Quenched is quenching plus two to high tempering three times.With the heating temperature required by S1~S4, heating time, cooling Jie
Matter, cooling time, final cooling temperature progress primary quenching processing, two to temper three times.
Wherein, after step S3 double temperings or after S4 is tempered three times, the air-cooled room temperature that is cooled to carries out Rockwell hardness detection, for
The hardness requirement of high temperature alloy (diskware) mold is：Case hardness maximum cannot be below 42HRC no more than 52HRC, minimum；It is right
Blade steel mold and the hardness requirement for closing knot steel mold are：Case hardness maximum cannot be below no more than 48HRC, minimum
38HRC。
Mold made from preparation method of the present invention.
The beneficial effects of the present invention are：
1), the present invention proposes that a kind of chemical composition of new Cr5 series hot die steel (being denoted as YB5 Series Die Steels) is matched
Side, compared with existing Cr5 systems (H13) hot die steel, YB5 Series Die Steels improve carbon content, improve Mn contents, drop
Low silicone content (YB5A, YB5C), reduces Mo contents, reduces V content, is added to Ni elements, is added to W elements, addition
Co elements (YB5C), it is added to Al elements (YB5A, YB5C).To improve the toughness of steel, improves elevated temperature strength and resist
Croop property etc..
2), the present invention proposes that YB5 Series Die Steels are reasonably smelted, heated, forging and conditioning treatment technological specification.It closes
Key point is to ensure that the macrostructure of steel is fine and close, and clarity is high, primary carbide and band-like rank are low, normalizing (rapid cooling) is organized carefully afterwards
Change, carbide is tiny and uniform etc. after nodularization.
3), the present invention has worked out Final Heat Treatment Process specification.Its key point is that quenching is cooling abundant, and tempering is eliminated and answered
Power is abundant.Obtained YB5 hardness of steel and hardness are higher, show there is higher anti-temper resistance, 600 DEG C of tempering, firmly
Degree is close with H13 or mutual height, toughness are far above H13.
Description of the drawings
Fig. 1 is that YB5A schemes with the hardness balance under H13 difference temperatures.
Fig. 2 is high temperature alloy diskware mold test position schematic diagram.
Fig. 3 is three coordinate measurement figure of diskware mold.In Fig. 3, upper mold before (a) die forging, (b) after die forging before upper mold (c) die forging
Lower die, (d) lower die after die forging.
Fig. 4 is the three coordinate measurement figure of size comparison of lower die before and after YB5A blade steel mold finish-forgings.In Fig. 4, the forging of (a) blade
Before making, (b) after blade forging, (c) before blade root forging, (d) after blade root forging.
Fig. 5,4,150 × 300 side of embodiment, 1000 DEG C of 6h water, 760 DEG C of 9h water (quenched nodularization) are molten through 4% nitric acid alcohol
Corrosion, microscopic structure are tempered sorbite (400 times of amplification).
Fig. 6 is YB5A φ 25mm samples, 1020 DEG C of oil, 580 DEG C of water, 580 DEG C of air-conditioning matter, the corrosion of 4% nital
Afterwards, microscopic structure is secondary troostite (400 times of amplification).
Fig. 7 is 560 × 260 samples of YB5A φ, 1010 DEG C of 570 DEG C of water, 570 DEG C of water skies (whole quenched), 4% nitric acid alcohol
After solution corrosion, microscopic structure is secondary troostite tissue (400 times of amplification).
Fig. 8 is 230 × 300 samples of YB5A, and 1020 DEG C of oil, after the corrosion of 4% nital, microscopic structure is thin plate
Martensite+carbide (400 times of amplification).
Fig. 9 is 230 × 300 samples of YB5A, and 1020 DEG C of oil, after the corrosion of 4% nital, microscopic structure is thin plate
Martensite+10 grades of carbide grain degree (400 times of amplification).
Figure 10 be YB5A φ 900mm × 300mm cake parts, spheroidizing tissue after forging, 4% nital corrosion after,
Microscopic structure is sorbite+paralympic.Institute's target size is 100 μm in figure.
Figure 11 is 230 × 300 sides of YB5A, spheroidizing tissue, the corrosion ferrite+spherical carburizing of 4% nital
AS6 grades of body (400 times of amplification).
Figure 12 is spherodized structure after the forging of 230 × 300 samples of YB5A, the corrosion of 4% nital, AS1 (amplifications 500
Times).
Spherodized structure after the forging of 230 × 300 samples of Figure 13 YB5A, the corrosion of 4% nital, AS1 (amplifications 200
Times).
Note：Spherodized structure is evaluated by North America compression mod Metallographic standard NADCA#207-2003 collection of illustrative plates.
Specific implementation mode
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..As described below is only the present invention
Preferred embodiment, it is noted that for those skilled in the art, do not departing from the technology of the present invention original
Under the premise of reason, several improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
In embodiment, unless otherwise instructed, used technological means is ordinary skill in the art means.
The composition range such as following table of Cr5 Series Steels proposed by the present invention.The specific of a certain ingredient is shown in embodiment
Example, in the range of following table is recorded, Cr5 series hot die steel obtained has same performance.
Embodiment 1
The preparation method of Cr5 series hot die steels, which is characterized in that including step：Electric furnace smelting, the refining of LF stoves
(LADLE FURNACE, that is, ladle refining furnace), vacuum outgas (VD) mold, annealing, electroslag remelting (ESR), and slow cooling is annealed, forging
It makes, normalizing, spheroidizing, expands hydrogen, it is thick to add, it examines, finishing is quenched, finishing, examines, and goes into operation.
By controlling the ingredient of molten steel, in mould steel obtained, in terms of weight %, including C0.44%, Si 0.40%, Mn
0.60%, P0.010%, S0.002%, Cr5.20%, Ni1.60%, Mo 0.90.%, V 0.60.%, W 0.55%, Co
0.09%, Al 0.10%, Nb 0.040%, the Fe of surplus.Obtained product is YB5A steel.
Embodiment 2
The method of smelting is the same as embodiment 1.By controlling the ingredient of molten steel, in mould steel obtained, in terms of weight %, including
C 0.43%, Si 1.00%, Mn 0.40%, P 0.012%, S0.0015%, Cr4.80%, Ni1.40.%, Mo1.00%,
V0.50%, W0.80%, Co 0.090.%, Al0.010%, Nb0.030%, the Fe of surplus.Obtained product is YB5B steel.
Embodiment 3
The method of smelting is the same as embodiment 1.By controlling the ingredient of molten steel, in mould steel obtained, in terms of weight %, including
C 0.43%, Si 0.40%, Mn 0.60%, P 0.009%, S0.001%, Cr 5.20%, Ni 1.60%, Mo1.10%,
V 0.60%, W 0.55.%, Co 0.53%, Al 0.20%, Nb 0.025%, the Fe of surplus.Obtained product is YB5C
Steel.
Embodiment 4
High temperature alloy mold is prepared with embodiment 1YB5A steel heat treatments, is labeled as JBD275-YB5A- φ 900x300, system
For diskware mold.
S1 is quenched：650 DEG C × (2 ± 0.5) h isothermals, 820 DEG C × (4 ± 0.5) h is warming up to stove for≤650 DEG C of shove charges, with
Stove is warming up to 1010 DEG C × (5 ± 0.5) h, 80~90min of oil cooling, and fuel-displaced (stopped immediately no more than half an hour in air) is tempered；
The temperature of quenching is 1000 DEG C, air-cooled temperature (see the table below) when comparing tempering, it is seen that 550 DEG C of tempering, YB5A
Intensity and hardness are higher, show there is higher anti-temper resistance, and 600 DEG C of tempering, hardness ratio H13 is slightly lower, and toughness is far high
In H13 (notes：Since the hardening heat of YB5A is slightly lower less than H13 events hardness).
S2 is once tempered：≤ 280 DEG C of shove charges, 280 DEG C × (5 ± 0.5) h, be warming up to 570~580 DEG C × (15 ± 0.5h)
Oil cooling be cooled to it is air-cooled after 100~150 DEG C of surface temperature, when fuel-displaced air-cooled, it is ensured that mold could carry out second after being cooled to room temperature
Tempering；
S3 double temperings：≤ 570 DEG C enter stove, and 570 DEG C × (13 ± 0.5) h, which is air-cooled to 100 DEG C or less, could carry out third time
Tempering；
S4 is tempered three times：≤ 570 DEG C enter stove, and the air-cooled room temperatures that are cooled to of 570 DEG C × (11 ± 0.5) h carry out Rockwell hardness detection.
The requirement of high temperature alloy die hardness：Case hardness maximum cannot be below 42HRC no more than 52HRC, minimum.
Tables 1 and 2 is shown in influence of the YB5A different heat treatments technique to mechanical property：
Table 1：
Table 2
It can be seen that 1000-1020 DEG C of optimal quenching temperature, temperature is more than or equal to 550 DEG C.
(4) YB5A mechanicals behavior under high temperature
Table 3
It can be seen that its elevated temperature strength is higher, table look-up convert its hardness be more than or equal to HRC48 (when 350 DEG C of experimental temperature, still in
Higher level).Table 4 lists the mechanical property of YB5A.
Table 4:Heat (batch) number 20506,40 side of specification, φ 25mm heat treatment test results
Analysis：1, hardening heat increases intensity and hardness rises；2, it is tempered water cooling more air-cooled intensity and hardness for the first time
Rise.Therefore rapid cooling is answered in tempering to mold for the first time.
Table 5:14506 specification of heat (batch) number, 40 side, the YB5A heat treatment test results of φ 25mm
Table 6:Heat (batch) number 14510,40 side of specification, the YB5A heat treatment test results of φ 25mm
Analysis：Contrast table 5 and table 6 are visible：Hardening heat increases, and intensity and hardness rise, and elongation slightly reduces.Therefore it quenches
Fiery temperature should choose 1010~1020 DEG C.
Table 7:Heat (batch) number 14510, module, φ 25mm heat treatment test results
Note:189-1,189-2 are longitudinal performance；190-1,190-2 are lateral performance.
Analysis：From table 7：1020 DEG C of optimal quenching temperature.Microscopic structure is shown in Fig. 5~13, it is seen that spheroidizing tissue
Qualification, quenching structure are strip of sheet martensite+choice refreshments shape carbide, are improved with hardening heat, and silver broadens, and carbide is reduced,
Quenching hardness increases, and tempering hardness also increases after tempering, and secondary troostite, 10 grades of grain size are organized as after tempering.
The following table 8 lists the mechanical property of YB5B.
Table 8：YB5B mechanical properties：
Conclusion：1020-1060 DEG C of hardening heat is tempered 550-600 DEG C.
The following table 9 lists the mechanical property of YB5C.
Table 9：YB5C mechanical properties
200*300 one-heating formings in table, heating diffusion time is short, and lateral performance is poor, needs two fire diffusions, repeatedly upsetting pull.
Table 10：Results of property after YB5C High temperature diffusions
Conclusion：1020-1060 DEG C of hardening heat is tempered 560-600 DEG C.
Embodiment 5
High temperature alloy mold diskware is prepared with embodiment 2YB5B steel heat treatments, is labeled as JBD275-YB5B- φ
900x300.Process of thermal treatment condition is the same as embodiment 4.
Embodiment 6
High temperature alloy mold diskware is prepared with embodiment 3YB5C steel heat treatments, is labeled as JBD275-YB5C- φ
900x300.Process of thermal treatment condition is the same as embodiment 4.
Embodiment 7
Blade steel mold is prepared with the YB5A steel heat treatments of embodiment 1, is labeled as SM985RL.DJ-YB5A-
1700x700x420 modules.Heat treatment process is as follows：
S1 is quenched：650 DEG C × (4 ± 0.5) h isothermals, 820 DEG C × (6 ± 0.5) h is warming up to stove for≤650 DEG C of shove charges, with
Stove is warming up to 1010 DEG C × (9 ± 0.5) h, 120~130min of oil cooling, and fuel-displaced (stopped immediately no more than half an hour in air) is returned
Fire；
S2 is once tempered：≤ 280 DEG C of shove charges, are warming up to 580~590 DEG C × (20 ± 0.5) h by 280 DEG C × (7 ± 0.5) h
Oil cooling be cooled to it is air-cooled after 100~150 DEG C of surface temperature, when fuel-displaced air-cooled, it is ensured that mold could carry out second after being cooled to room temperature
Tempering；
S3 double temperings：≤ 580 DEG C enter stove, and 580 DEG C × (18 ± 0.5) h, which is air-cooled to 100 DEG C or less, could carry out third time
Tempering；
S4 is tempered three times：≤ 580 DEG C enter stove, and the air-cooled room temperatures that are cooled to of 580 DEG C × (16 ± 0.5) h carry out Rockwell hardness detection；
The requirement of Blade Steel die hardness：Case hardness maximum cannot be below 38HRC no more than 48HRC, minimum.
Embodiment 8
Prepare high temperature alloy mold with the YB5B steel heat treatments of embodiment 2, labeled as SM985RL.DJ-YB5B-1700 ×
700 × 420 modules.Process of thermal treatment condition is the same as embodiment 7.
Embodiment 9
Prepare high temperature alloy mold with the YB5C steel heat treatments of embodiment 3, labeled as SM985RL.DJ-YB5C-1700 ×
700 × 420 modules.Process of thermal treatment condition is the same as embodiment 7.
Test example
1) performance test
YB5A and the hardness balance under H13 difference temperatures, see Fig. 1.
YB5A, YB5B, YB5C and H13 anti-temper resistance are relatively shown in Table 11.
Table 11：H13, YB5A, YB5B temperature and hardness relation
Note:The temperature that YB5C corresponds to hardness HRC53,49~50,45 is 565 DEG C, 585 DEG C, 610 DEG C respectively.It (is shown in Table
9~10)
It can be seen that YB5A, YB5B and H13 anti-temper resistance are same levels, the anti-temper resistance of YB5C is then higher.
2) deflection compares, and the result that existing four kinds of mould steel forges high temperature alloy diskware is compared in following table, it is seen that
5CrNiMo, 5CrNiMoV, import FX make a call to 4 deflections and are more than 4mm, H13 crack of die.
12 deflection of table compares
Table 13 is that YB5A molds beat 8 deflection comparing results of cake part with 5CrNiMoV build-up welding moulds.It is respectively tested on mold
Fig. 2 is seen in the position of point.Wherein 2A-1~2A-4 be YB5A as a result, deforming less than 1mm, 2A-5~2A-8 is that 5CrNoMoV is built-up welding
As a result, deformation maximum 3.5mm.
Table 14 is forged high temperature alloy cake part for YB5A molds and is compared using front and back hardness data.It can be seen that YB5A upper mold hardness drops
5~8 HRC drop in low about 2~3 HRC, lower die.Built-up welding upper and lower mould hardness reduces about 2~3 HRC, smaller than YB5A.YB5A
Die deformation is less than 1mm, and built-up welding 5CrNiMoV deforms 3.5mm, it is seen that YB5A mold integral strength height is the small master of die deformation
Want reason.
YB5B molds and YB5C mold diskwares prepared by embodiment 5 and embodiment 6, uses, it was demonstrated that its performance phase through client
When or be better than H13 mould steel, and H13 is not suitable for relatively large forging die.YB5B molds and YB5C molds be proved to fully meet compared with
Large-scale and greater impact power requirement.
Table 13
Table 14
4) YB5A molds are in the JBD275 high temperature alloy disk service life
Five~eight grades of disk molds that YB5A materials make produce JBD275 58 total (without false material) altogether.On first time
The continuous die forging 4 in field, repetition measurement die deformation ＜ 0.2mm after end do not do reparation and are continuing with；It enters the court for the second time continuous die forging 19
Part, repetition measurement die deformation ＜ 0.9mm after end, does not do reparation and is continuing with；Third time is entered the court continuous die forging 35, multiple after end
Survey die deformation ＜ 1.0mm.
Pass through the mold repetition measurement data after end three times, it is seen that plasticity when YB5A mold materials forge solid high temperature alloy disk
Deformation is smaller, and surface abrasion is smaller.It is thus regarded that YB5A mold materials can be competent at the forging of solid diskware under prevailing conditions
Production.
5) application result of the YB5A molds on stainless steel blade forging
SM985RL.DJ-YB5A lower moulds are entered the court front surface 42~44HRC of hardness, and end hardness is basically unchanged.Finish-forging
Front and back lower die size comparison, production quantity 120 (SPKA11200), blade mold maximum distortion 0.3mm, blade root mold are maximum
Deform 0.5mm, the essentially unchanged shape of mold.Lower die size comparison before and after SM985RL.DJ-5CrNiMoV mold finish-forgings, production quantity
20 (SPKA22400), 44~48HRC of hardness before mold is entered the court, mold maximum distortion 1.565mm, deformation are larger.
From the angle of project, solve the problems, such as that high alloy hammering mold can be used in 3.55 ten thousand tons of fly presses, really
The forging of 3.55 ten thousand tons of Blade Steels can be used for by having determined YB5A molds.
6) result that YB5A, YB5B, YB5C are applied on other hot forged moulds
It is three times of 5CrNiMo for spindle hot-forging die service life 15000.For vapour bent axle hot-forging die
Advantage is not crack, and the service life is suitable with H13.Application major advantage on other hot-forging dies is indeformable, forging surface size
Precision is high, does not have to reconditioning.
It is disclosed above or require embodiment can be made in the range of no more than existing disclosed laboratory facilities or
Implement.All products and/or method described in the preferred embodiment of the present invention expressly refer to those and do not violate the present invention
Concept, scope and spirit can be used for the product and/or experimental method and following step.To in the technique
All changes and improvement of technological means, belong to concept, the scope and spirit that the claims in the present invention define.
Claims (9)
1. a kind of preparation method of alloy mold, the alloy mold is one kind in high temperature alloy mold, blade steel mold,
It is characterized in that, manufactured with Cr5 series hot die steels, the hot die steel is in terms of weight %, including C0.40~0.48%,
Si 0.20~1.2%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr4.80~5.50%, Ni 1.40~
2.0%, Mo 0.80~1.50%, V 0.50~0.70%, W 0.50-1.00%, Co 0~0.75%, Al0.01~
0.20%, Nb 0.02~0.20%, the Fe of surplus；
The preparation method of the Cr5 series hot die steel includes step：Electric furnace or converter smelting, the refining of LF stoves, vacuum outgas,
Molding is annealed, electroslag remelting, and slow cooling is annealed, forging, normalizing, spheroidizing, and expansion hydrogen is thick to add, and examines, thick to add, quenched, essence
Add, examines；
The preparation method of the alloy mold includes step：
S1 is quenched：≤ 650 DEG C of shove charges, isothermal at a temperature of being maintained at 650 DEG C are warming up to 800~820 DEG C of isothermals with stove, when isothermal
Between calculated by the effective dimensions 0.6min/mm of workpiece, then be warming up to 1000~1020 DEG C with stove, kept for 10~12 hours, oil cooling
Be cooled to 150~180 DEG C it is fuel-displaced after be tempered immediately；
S2 is once tempered：≤ 280 DEG C of shove charges, 4~10h of isothermal at a temperature of being maintained at 280 DEG C are warming up to 570~595 DEG C, keep
14~22h, oil cooling be cooled to it is air-cooled after 100~150 DEG C of surface temperature, when fuel-displaced air-cooled, it is ensured that mold is cooled to after room temperature could be into
Second of tempering of row；
S3 double temperings：≤ 300 DEG C enter stove, and 560 DEG C of diskware keeps 580 DEG C of holding 18h of 12h or blade, be air-cooled to 100 DEG C with
Under.
2. preparation method according to claim 1, which is characterized in that the hot die steel is in terms of weight %, including C
0.40~0.48%, Si 0.20~0.40%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr 4.80~
5.50%, Ni 1.40~2.0%, Mo 0.80~1.50%, V 0.50~0.70%, W 0.50-1.00%, Al 0.06~
0.20%, Nb 0.02~0.20%, the Fe of surplus.
3. preparation method according to claim 1, which is characterized in that the hot die steel in terms of weight %, including
C0.40~0.48%, Si 0.4~1.0%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr 4.80~
5.50%, Ni 1.40~2.0%, Mo 0.80~1.50%, V 0.50~0.70%, W 0.50~1.00%, Al 0.01~
0.04%, Nb 0.02~0.20%, the iron of surplus.
4. preparation method according to claim 1, which is characterized in that the hot die steel in terms of weight %, including
C0.40~0.48%, Si 0.20~0.40%, Mn 0.40~0.80%, P≤0.020%, S≤0.010%, Cr 4.80~
5.50%, Ni 1.40~2.0%, Mo0.80~1.50%, V0.50~0.70%, W 0.50~1.00%, Co 0.50~
0.75.%, Al0.06~0.20%, Nb0.02~0.20%, the iron of surplus.
5. preparation method according to claim 1, which is characterized in that the alloy mold is high temperature alloy mold or blade
Steel mold, preparation method include
S4 is tempered three times：≤ 300 DEG C enter stove, and 580 DEG C of temperature keep 1.8min/mm, the air-cooled room temperature that is cooled to carry out Rockwell hardness inspection
It surveys.
6. preparation method according to claim 5, which is characterized in that
In step sl, isothermal 0.6min/mm at a temperature of being maintained at 650 DEG C is warming up to 800~820 DEG C of holding 0.6min/ with stove
Mm, then with stove be warming up to 1000~1020 DEG C holding 1.0~1.2min/mm, be cooled to 150~180 DEG C it is fuel-displaced after be tempered immediately；
In step s 2, diskware keeps diskware 15h or blade to keep 21h in 585-595 DEG C of temperature in 570~580 DEG C of temperature,
Oil cooling be cooled to it is air-cooled after 100~150 DEG C of surface temperature, when fuel-displaced air-cooled, it is ensured that mold could carry out S3's after being cooled to room temperature
Double tempering；
In step s3,560 DEG C of temperature of diskware keep diskware 12h or blade to keep 18h at 580 DEG C, are air-cooled to 100 DEG C or less
Carry out third time tempering；
In step s 4,560 DEG C of temperature of diskware keep 580 DEG C of holding 16h of 10h or blade.
7. preparation method according to claim 1, which is characterized in that
In step sl, isothermal 0.6min/mm at a temperature of being maintained at 650 DEG C is warming up to 820 DEG C of holding 0.6min/mm with stove, then
With stove be warming up to 1000~1020 DEG C holding 1.0~1.2min, be cooled to 150~180 DEG C it is fuel-displaced after be tempered immediately；
In step s 2,2.4~3.0min/mm, oil cooling is kept to be cooled to 100~150 DEG C of surface temperature in 585~595 DEG C of temperature
It is air-cooled afterwards, when fuel-displaced air-cooled, it is ensured that mold is cooled to the double tempering for carrying out S3 after room temperature；
In step s3,580 DEG C of temperature keep 1.8~2.4min/mm, are air-cooled to 100 DEG C or less progress third time tempering.
8. according to claim 1~7 any one of them preparation method, which is characterized in that the final step of preparation method is air-cooled
After being cooled to room temperature, Rockwell hardness detection is carried out, the hardness requirement for high temperature alloy mold is：Case hardness maximum is no more than
52HRC, minimum cannot be below 42HRC；Hardness requirement to blade steel mold is：Case hardness maximum is no more than 48HRC, most
It is small to cannot be below 38HRC.
9. the mold made from any preparation method of claim 1~8.
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