CN105274437A - Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof - Google Patents

Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof Download PDF

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Publication number
CN105274437A
CN105274437A CN201510643911.0A CN201510643911A CN105274437A CN 105274437 A CN105274437 A CN 105274437A CN 201510643911 A CN201510643911 A CN 201510643911A CN 105274437 A CN105274437 A CN 105274437A
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temperature
steel
die steel
thermal fatigue
forging
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Inventor
周青春
徐卫明
顾金才
葛建辉
钱强
赵博伟
丁勇
王小飞
任志强
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Grand Luxuriant Heavy Co Ltd That Forges And Presses Of Rugao City
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Grand Luxuriant Heavy Co Ltd That Forges And Presses Of Rugao City
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Abstract

The invention relates to thermal fatigue resisting and high performance hot working die steel and a manufacturing process thereof and belongs to the technical field of alloy steel manufacturing processes. A base body of the thermal fatigue resisting and high performance hot working die steel is composed of, by mass, 0.15-0.30% of C, 0.00-0.40% of Si, 0.30-1.00% of Mn, 3.50-4.50% of Cr, 1.50-2.00% of Mo, 0.20-1.00% of W, 0.40-0.80% of V, 0.00-0.02% of P, 0.00-0.02% of S, 0.00-0.15% of Nb and the balance Fe. The manufacturing process of the thermal fatigue resisting and high performance hot working die steel comprises the steps that burdening, smelting, casting, then electroslag remelting, high temperature heat diffusion heat treatment, then multidirectional forging heat machining and post-forging control cooling are conducted; secondary carbide refining heat treatment and isothermal annealing processing are conducted; finally, quenching and tempering heat processing are conducted, the steel is heated to be 950-1100 DEG C for austenitizing, and two to three times of tempering are conducted at the temperature of 540-630 DEG C after oil cooling or mist cooling. The hot working die steel has high thermal fatigue resistance, high thermal stability and high toughness.

Description

A kind of thermal fatigue resistance high performance hot-work die steel and manufacturing process thereof
Technical field
The present invention relates to a kind of die steel and manufacturing process thereof, be specifically related to a kind of thermal fatigue resistance high performance hot-work die steel and manufacturing process thereof, this die steel makes full use of the alloying action feature of the many alloying elements of Cr-Mo-W-V-Nb, ensure the high hardening capacity of steel and high high-temp stability and thermal fatigue property, the use temperature of steel not only can be made to reach more than 600 DEG C, and there is the thermostability higher than H13 steel and good toughness and thermal fatigue property, belong to technical field of alloy steel.
Background technology
Hot-work die steel is the die steel that (generally higher than 500 DEG C) at relatively high temperatures uses, wherein play the alloying element normally alloying element such as Cr, Mo, V of high-temperature hot epistasis and thermostability, some therefore current research work are mainly to the adjustment of these alloying elements.This research finds, the Mo element of high level add the thermal fatigue resistance and anti-temper softening performance that can improve steel, and a certain amount of W element add thermostability and the thermal fatigue resistance that greatly can improve steel, the use temperature of this steel is improved greatly, thus do die steel for the manufacture of the heat of high thermal fatigue resistance, if use temperature is higher than the transfer mold of 600 DEG C, in addition, microalloy element Nb adds, the effect of crystal grain thinning can be played, thus improve the thermostability of steel and the stability of carbide further.
The hot-work die steel of the current widespread use of China comprises 4Cr5MoSiV1,3Cr2W8V and is applied to 5CrNiMo, 5CrMnMo etc. of hot-forging die.Although the 3Cr2W8V of tungsten system has higher resistance to tempering and high heat resistance, but its plasticity and toughness, thermal conductivity is poor with its thermal fatigue property, the heat resistance of 5CrNiMo and 5CrMnMo is poor, easily cause subsiding of working portion of die, what the Extrusion Die Steel that China uses at present adopted is that in standard GB/T/T1299-2000, grade of steel is 4Cr5MoSiV1, this Extrusion Die Steel is present most popular hot-work die steel, but its hot strength is not very high, general use temperature can not more than 540 DEG C, and thermal fatigue resistance and thermal stability not high.Chemical Composition due to this Extrusion Die Steel contains higher molybdenum, chromium and v element and a certain amount of carbon, belong to hypereutectoid steel, therefore the segregation of its material ESR ingot is serious, a large amount of bulk Aliquation carbide is there is in tissue after becoming a useful person, make the toughness of material not enough, easily occur that early-age crack lost efficacy.Because this material contains a large amount of secondary hardening elements, easily grow up under condition under arms alligatoring and occurrence type of its tempering state proeutectoid carbide changes, and the alloying element in tempered martensite is also easily separated out and reduces the intensity of steel, thus reduce the high-temperature behavior of steel.The performance index of this steel are: adding Rockwell hardness number after 590 DEG C ~ 610 DEG C tempering through 1030 DEG C of quenchings is 44-46HRC, notched bar impact strength (" V " type breach) Ak is >=8J, these performance index such as hardness value and notched bar impact strength for high request transfer mold be inadequate.In addition, anti-temper softening ability and thermal fatigue resistance are the important performance indexes of hot-work die steel.
The metallurgical manufacturing process of above-mentioned hot-work die steel adopts electrosmelting to add esr, then forges the technique of becoming a useful person.In its manufacturing process, electrosmelting adds the ESR ingot obtaining 500Kg ~ 3000Kg after esr operation completes, and becomes a useful person through the forging of forging machine.There are the following problems for this manufacturing process: 1) electroslag ingot shape is less, and little ingot shape reduces the lumber recovery of product and manufactures production capacity; 2) there is a large amount of macrobeads or large block Aliquation carbide and microstructure segregation in the original structure of ESR ingot, reduce steel ingot forging become a useful person after performance index; 3) after forging, material grains is thick, and after the tempering that causes quenching, the impelling strength of material is low, and product specification is low, cannot meet the needs of market to large section, high tenacity, high heat-intensity hot-work die steel.
When current domestic production high speed development, the present invention is from the angle improving mould net thickness, break the situation of domestic large die-casting mould steel dependence on import, large die-casting mould steel is domesticized, improve competitive power and the die steel manufacture level of domestic die steel, thus have developed a kind of large section die casting high performance hot-work die steel.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of large section die casting thermal fatigue resistance high performance hot-work die steel and manufacturing process thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of thermal fatigue resistance high performance hot-work die steel, its innovative point in: die steel matrix is made up of the component of following mass percent:
C0.15%~0.30%;
Si0.00%~0.40%;
Mn0.30%~1.00%;
Cr3.50%~4.50%;
Mo1.50%~2.00%;
W0.20%~1.00%;
V0.40%~0.80%;
P0.00%~0.02%;
S0.00%~0.02%;
Nb0.00%~0.15%;
All the other are Fe.
The manufacturing process of described a kind of thermal fatigue resistance high performance hot-work die steel has following steps:
Steps A. smelt: by thermal fatigue resistance high performance hot-work die steel matrix forming by following mass percent component: C0.15% ~ 0.30%; Si0.00% ~ 0.40%; Mn0.30% ~ 1.00%; Cr3.50% ~ 4.50%; Mo1.50% ~ 2.00%; W0.20% ~ 1.00%; V0.40% ~ 0.80%; P0.00% ~ 0.02%; S0.00% ~ 0.02%; Nb0.00% ~ 0.15%; All the other are Fe, carry out preparing burden, electric arc furnace slag and refining, then carry out secondary electroslag remelting, obtain steel ingot;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1100 ~ 1280 DEG C, is incubated 10 ~ 15 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 1150 ~ 1250 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C;
Step D. cooling after forged: the steel ingot after step C process is adopted controlled cooling model, ensures that steel ingot cools fast with certain cooling rate, is reduced to less than 200 DEG C fills Annealing furnace to temperature;
Step e. proeutectoid carbide ultrafining heat-treatment: the steel ingot after step D process is heated again, Heating temperature is 950 ~ 1150 DEG C, is incubated 5 ~ 10 hours, is then chilled to less than 250 DEG C soon, then send annealing furnace;
Step F. isothermal spheroidizing process: annealing furnace first stage isothermal annealing temperature is 830 ~ 850 DEG C, the first stage annealing time is 5 ~ 10 hours, and annealing furnace subordinate phase isothermal annealing temperature is 730 ~ 750 DEG C, and the secondary stage annealing time is 10 ~ 20 hours;
Step G. quenching and tempering thermal treatment: the steel ingot after step F process is heated to 950 ~ 1100 DEG C again, adopt oil cooling or water smoke to be cooled to less than 250 DEG C again, carry out temper subsequently, tempering 2 ~ 3 times, each tempering temperature 540 DEG C ~ 630 DEG C, each tempering keeps 2 ~ 4 hours.
Preferred: described die steel matrix is made up of the component of following mass percent:
C0.25%;
Si0.30%;
Mn0.60%;
Cr4.00%;
Mo1.80%;
W0.60%;
V0.50%;
P0.000%~0.007%;
S0.00%~0.003%;
Nb0.15%;
All the other are Fe.
Preferred: described step B. High temperature diffusion thermal treatment, point stepped heating in steel ingot temperature-rise period, ensure that steel ingot internal and external temperature is even, namely respectively at 600 DEG C, 800 DEG C and 1000 DEG C of high temperature, at 1100 DEG C ~ 1150 DEG C temperature after High temperature diffusion thermal treatment, be incubated after 10 ~ 15 hours, after steel ingot homogeneous temperature, carry out forging thermal treatment.
Preferred: the rapid cooling of described step e is the one in oil cooling or water-cooled.
The invention has the advantages that: the present invention has outstanding hardening capacity, thermostability, impelling strength and thermal fatigue property, these indexs are all better than general H13 hot-work die steel.
Accompanying drawing explanation
Fig. 1 is the CCT curve of hot-work die steel of the present invention.
Fig. 2 is the tempering characteristics curve of hot-work die steel of the present invention under 1030 DEG C of quenchings.
Fig. 3 is that hot-work die steel of the present invention contrasts with H13 steel thermal stability data at 620 DEG C.
Fig. 4 is hot-work die steel of the present invention and the contrast of H13 steel thermal fatigue section hardness gradient.
Embodiment
The theoretical foundation of its Composition Design of thermal fatigue resistance high performance hot-work die steel of the present invention is as described below:
This hot-work die steel, compared with general H13 hot-work die steel, suitably reduces carbon content, adds Mo content simultaneously, and adds the alloying element W improving thermostability, adds micro alloying element Nb.Reduce the uniformity of hardness that a certain amount of carbon is conducive to improving steel; The content improving Mo element is conducive to the people's stability and the heat resistance that improve steel, improves the heat-resistant anti-fatigue performance of steel simultaneously; W is carbide stabilizing element, greatly can improve the thermostability of steel, and the mold use temperature that this steel is processed improves greatly; Adding of microalloy Nb element, can crystal grain thinning and improve the thermostability of steel, thus improve the applied at elevated temperature performance of steel.Although manganese element is weak carbide forming element, can not form carbide reinforced effect, adding of a certain amount of manganese element can promote the decomposition of cementite and postpone the precipitation of carbide and grow up, and is conducive to the thermostability of steel.In addition, manganese element can cause the content of the residual austenite in steel to increase with stable, can improve toughness and the thermal fatigue resistance of steel like this.Element silicon is not carbide forming element, but element silicon is the effective element improving resistance to tempering, the content improving element silicon in steel mainly can make steel martensitic decomposition in the process of tempering slow down, element silicon effectively can hinder martensitic decomposition in the drawing process after austenite to martensitic transformation, this mainly by suppressing growing up and expanding ε-carbide stable region of ε-carbide particle, is delayed the transformation of ε-carbide to θ-carbide.Silicon is postponed ε → θ and is changed, and fully can reduce the growth rate of cementite in drawing process in steel, and Siliciumatom is separated out from θ phase and around θ phase, forms the enrichment region of Siliciumatom, suppresses the alligatoring of growing up of θ phase; Silicon effectively can improve the anti-temper softening ability of steel in addition.Because the avidity of V and carbon is strong, in the process of smelting, easily form VC primary carbide, this carbide particle size is comparatively large, does not only improve the performance of steel, the toughness of contrary reduction steel and thermal fatigue property etc., and be difficult to eliminate completely in heat treatment process subsequently.Therefore suitably reduce V content in steel and can effectively reduce the ratio of VC primary carbide, improve the performance of steel.But V can reduce martensitic decomposition rate in drawing process, postpone austenitic transformation, and V-arrangement becomes the proeutectoid carbide of MC type, small and dispersed, not easily agglomeration, in drawing process, enhance age hardening effect, greatly improve thermostability and the impelling strength of steel.Therefore, the content of V in steel is controlled between 0.4 ~ 0.8%, gives full play to the alloying action of V.Cr is main in hot working die steel forms Cr23C6 type carbide, plays strengthening effect, improves the intensity of steel.
Embodiment 1
Thermal fatigue resistance high performance hot-work die steel matrix is made up of the component of following mass percent: C0.30%, Si0.30%, Mn0.60%, Cr4.00%, Mo1.80%, W0.70%, V0.50%, P0.003%, S0.01%, Nb0.12%; All the other are Fe.
A kind of manufacturing process of thermal fatigue resistance high performance hot-work die steel has following steps:
Steps A. smelt: in electric arc furnace, carry out melting by above-mentioned component composition, smelting temperature is greater than 1500 DEG C, is cast into Ф 400mm ~ Ф 450mm steel ingot and air cooling; Steel ingot after casting is positioned in electroslag remelting device as consumable electrode, carry out esr, change slag voltage 56 ~ 62V, electric current 3000 ~ 5000A, electricity system voltage 57 ~ 59V, electric current 11000 ~ 12000A, bind voltage 57 ~ 59V, continue 35 ~ 50 minutes, esr becomes 1000Kg ~ 15000Kg steel ingot;
Step B. High temperature diffusion thermal treatment: the Heating Steel Ingots to 1240 after esr DEG C ~ 1260 DEG C is carried out High temperature diffusion thermal treatment, is incubated 15 hours, uniform formation, improves alloying constituent segregation and eliminate Aliquation carbide;
Step C. forges hot-work: be cooled in 1150 ~ 1250 DEG C of temperature ranges by heat treated for above-mentioned High temperature diffusion steel ingot and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C;
Step D. cooling after forged: forging hot-work adopts controlled cooling model later, ensures that steel ingot cools fast with certain cooling rate, is reduced to less than 200 DEG C fills Annealing furnace to temperature;
Step e. proeutectoid carbide ultrafining heat-treatment: cooled steel ingot is heated again, Heating temperature is 1100 DEG C, is incubated 10 hours, and then rapid cooling (oil cooling or water-cooled) is to less than 250 DEG C, then send annealing furnace;
Step F. isothermal spheroidizing process: annealing furnace first stage isothermal annealing temperature is 830 ~ 850 DEG C, the first stage annealing time is 6 hours, annealing furnace subordinate phase isothermal annealing temperature is 730 ~ 750 DEG C, and the secondary stage annealing time is 10 hours, cools to room temperature with the furnace subsequently;
Step G. quenching and tempering thermal treatment: quenched by the steel ingot of isothermal spheroidizing process, quenching temperature is 1020 DEG C, adopts oil quenching, carries out double tempering, each tempering 2 hours at 600 DEG C.
Embodiment 2
Thermal fatigue resistance high performance hot-work die steel matrix is made up of the component of following mass percent: C0.25%, Si0.35%, Mn0.70%, Cr4.00%, Mo1.80%, W0.60%, V0.40%, P0.01%, S0.003%, Nb0.10%; All the other are Fe.
A kind of manufacturing process of thermal fatigue resistance high performance hot-work die steel has following steps:
Steps A. smelt: in electric arc furnace, carry out melting by above-mentioned component composition, smelting temperature is greater than 1500 DEG C, is cast into Ф 400mm ~ Ф 450mm steel ingot and air cooling; Steel ingot after casting is positioned in electroslag remelting device as consumable electrode, carry out esr, change slag voltage 56 ~ 62V, electric current 3000 ~ 5000A, electricity system voltage 57 ~ 59V, electric current 11000 ~ 12000A, bind voltage 57 ~ 59V, continue 35 ~ 50 minutes, esr becomes 1000Kg ~ 15000Kg steel ingot;
Step B. High temperature diffusion thermal treatment: the Heating Steel Ingots to 1240 after esr DEG C ~ 1260 DEG C is carried out High temperature diffusion thermal treatment, is incubated 15 hours, uniform formation, improves alloying constituent segregation and eliminate Aliquation carbide;
Step C. forges hot-work: be cooled in 1150 ~ 1250 DEG C of temperature ranges by heat treated for above-mentioned High temperature diffusion steel ingot and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C;
Step D. cooling after forged: forging hot-work adopts controlled cooling model later, ensures that steel ingot cools fast with certain cooling rate, is reduced to less than 200 DEG C fills Annealing furnace to temperature;
Step e. proeutectoid carbide ultrafining heat-treatment: cooled steel ingot is heated again, Heating temperature is 1100 DEG C, is incubated 10 hours, and then rapid cooling (oil cooling or water-cooled) is to less than 250 DEG C, then send annealing furnace;
Step F. isothermal spheroidizing process: annealing furnace first stage isothermal annealing temperature is 830 ~ 850 DEG C, the first stage annealing time is 6 hours, annealing furnace subordinate phase isothermal annealing temperature is 730 ~ 750 DEG C, and the secondary stage annealing time is 10 hours, cools to room temperature with the furnace subsequently;
Step G. quenching and tempering thermal treatment: quenched by the steel ingot of isothermal spheroidizing process, quenching temperature is 1020 DEG C, adopts oil quenching, carries out double tempering, each tempering 2 hours at 600 DEG C.
Embodiment 3
Thermal fatigue resistance high performance hot-work die steel matrix is made up of the component of following mass percent: C0.15%, Si0.32%, Mn0.50%, Cr4.00%, Mo1.50%, W0.50%, V0.60%, P0.01%, S0.01%, Nb0.10%; All the other are Fe.
A kind of manufacturing process of thermal fatigue resistance high performance hot-work die steel has following steps:
Steps A. smelt: in electric arc furnace, carry out melting by above-mentioned component composition, smelting temperature is greater than 1500 DEG C, is cast into Ф 400mm ~ Ф 450mm steel ingot and air cooling; Steel ingot after casting is positioned in electroslag remelting device as consumable electrode, carry out esr, change slag voltage 56 ~ 62V, electric current 3000 ~ 5000A, electricity system voltage 57 ~ 59V, electric current 11000 ~ 12000A, bind voltage 57 ~ 59V, continue 35 ~ 50 minutes, esr becomes 1000Kg ~ 15000Kg steel ingot;
Step B. High temperature diffusion thermal treatment: the Heating Steel Ingots to 1240 after esr DEG C ~ 1260 DEG C is carried out High temperature diffusion thermal treatment, is incubated 15 hours, uniform formation, improves alloying constituent segregation and eliminate Aliquation carbide;
Step C. forges hot-work: be cooled in 1150 ~ 1250 DEG C of temperature ranges by heat treated for above-mentioned High temperature diffusion steel ingot and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C;
Step D. cooling after forged: forging hot-work adopts controlled cooling model later, ensures that steel ingot cools fast with certain cooling rate, is reduced to less than 200 DEG C fills Annealing furnace to temperature;
Step e. proeutectoid carbide ultrafining heat-treatment: cooled steel ingot is heated again, Heating temperature is 1100 DEG C, is incubated 10 hours, and then rapid cooling (oil cooling or water-cooled) is to less than 250 DEG C, then send annealing furnace;
Step F. isothermal spheroidizing process: annealing furnace first stage isothermal annealing temperature is 830 ~ 850 DEG C, the first stage annealing time is 6 hours, annealing furnace subordinate phase isothermal annealing temperature is 730 ~ 750 DEG C, and the secondary stage annealing time is 10 hours, cools to room temperature with the furnace subsequently;
Step G. quenching and tempering thermal treatment: quenched by the steel ingot of isothermal spheroidizing process, quenching temperature is 1020 DEG C, adopts oil quenching, carries out double tempering, each tempering 2 hours at 600 DEG C.
Thermal fatigue resistance high performance hot-work die steel of the present invention is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (the wide * of long * is high) 4000mm*800mm*300mm module, and performance test is carried out in sampling:
Transformation temperature: Ac1, Ac3 and Ms point test result is respectively 820 DEG C, 890 DEG C and 280 DEG C;
Tempering characteristics: the rational curve that the tempered-hardness after 1030 DEG C of quenchings changes with tempering temperature as shown in Figure 1;
Hardness test: quenching hardness: 56.2HRC; Tempered-hardness: 50HRC;
Annealed structure: the annealed structure of steel of the present invention as shown in Figure 2;
Impelling strength is tested: on blank, get lateral impact sample, and specimen size is that 7mm × 10mm × 55mm(adopts North America die casting association criterion), room temperature impact work value: >=280J;
Thermostability: hot-work die steel of the present invention carries out stability contrast experiment with H13 steel under 620 DEG C of conditions, H13 steel makes its hardness value the same with steel of the present invention after temper of quenching, be 50HRC, although it is consistent with H13 steel hardness value that experiment starts front hot-work die steel of the present invention, but at 620 DEG C, from carrying out 20 hours thermostability experiment changes in hardness situations, hot-work die steel of the present invention is better than H13 steel;
Hot fatigue performance test: carry out cold cycling under DEG C condition of room temperature ~ 700, after 3000 cold cycling, contrasts thermal fatigue surface topography and the section hardness gradient of hot-work die steel of the present invention and H13 steel; After hot-work die steel thermal fatigue test of the present invention, surface crack is very even, tiny, does not see the formation of larger lead crack from the teeth outwards.And the surface crack of H13 steel reticulates, and wherein exist several width larger lead crack, mutually through between crackle, in cracking shape.In addition, can find out that the hardness of H13 steel declines significantly in hot-work die steel of the present invention from section hardness Gradient distribution.The two contrast can be found out, the thermal fatigue property of hot-work die steel of the present invention is better than H13 steel.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims (5)

1. a thermal fatigue resistance high performance hot-work die steel, is characterized in that: die steel matrix is made up of the component of following mass percent:
C0.15%~0.30%;
Si0.00%~0.40%;
Mn0.30%~1.00%;
Cr3.50%~4.50%;
Mo1.50%~2.00%;
W0.20%~1.00%;
V0.40%~0.80%;
P0.00%~0.02%;
S0.00%~0.02%;
Nb0.00%~0.15%;
All the other are Fe.
2. a kind of thermal fatigue resistance high performance hot-work die steel according to claim 1, is characterized in that: described die steel matrix is made up of the component of following mass percent:
C0.25%;
Si0.30%;
Mn0.60%;
Cr4.00%;
Mo1.80%;
W0.60%;
V0.50%;
P0.000%~0.007%;
S0.00%~0.003%;
Nb0.15%;
All the other are Fe.
3. a technique for the thermal fatigue resistance high performance hot-work die steel described in manufacturing claims 1 or 2, is characterized in that: this manufacturing process has following steps:
Steps A. smelt: by thermal fatigue resistance high performance hot-work die steel matrix forming by following mass percent component: C0.15% ~ 0.30%; Si0.00% ~ 0.40%; Mn0.30% ~ 1.00%; Cr3.50% ~ 4.50%; Mo1.50% ~ 2.00%; W0.20% ~ 1.00%; V0.40% ~ 0.80%; P0.00% ~ 0.02%; S0.00% ~ 0.02%; Nb0.00% ~ 0.15%; All the other are Fe, carry out preparing burden, electric arc furnace slag and refining, then carry out secondary electroslag remelting, obtain steel ingot;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1100 ~ 1280 DEG C, is incubated 10 ~ 15 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 1150 ~ 1250 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C;
Step D. cooling after forged: the steel ingot after step C process is adopted controlled cooling model, ensures that steel ingot cools fast with certain cooling rate, is reduced to less than 200 DEG C fills Annealing furnace to temperature;
Step e. proeutectoid carbide ultrafining heat-treatment: the steel ingot after step D process is heated again, Heating temperature is 950 ~ 1150 DEG C, is incubated 5 ~ 10 hours, is then chilled to less than 250 DEG C soon, then send annealing furnace;
Step F. isothermal spheroidizing process: annealing furnace first stage isothermal annealing temperature is 830 ~ 850 DEG C, the first stage annealing time is 5 ~ 10 hours, and annealing furnace subordinate phase isothermal annealing temperature is 730 ~ 750 DEG C, and the secondary stage annealing time is 10 ~ 20 hours;
Step G. quenching and tempering thermal treatment: the steel ingot after step F process is heated to 950 ~ 1100 DEG C again, adopt oil cooling or water smoke to be cooled to less than 250 DEG C again, carry out temper subsequently, tempering 2 ~ 3 times, each tempering temperature 540 DEG C ~ 630 DEG C, each tempering keeps 2 ~ 4 hours.
4. the manufacturing process of a kind of thermal fatigue resistance high performance hot-work die steel according to claim 3, it is characterized in that: described step B. High temperature diffusion thermal treatment, point stepped heating in steel ingot temperature-rise period, ensure that steel ingot internal and external temperature is even, namely respectively at 600 DEG C, 800 DEG C and 1000 DEG C of high temperature, at 1100 DEG C ~ 1150 DEG C temperature after High temperature diffusion thermal treatment, be incubated after 10 ~ 15 hours, after steel ingot homogeneous temperature, carry out forging thermal treatment.
5. the manufacturing process of a kind of thermal fatigue resistance high performance hot-work die steel according to claim 3, is characterized in that: the rapid cooling of described step e is the one in oil cooling or water-cooled.
CN201510643911.0A 2015-10-08 2015-10-08 Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof Pending CN105274437A (en)

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CN105886933A (en) * 2016-05-12 2016-08-24 天津钢研海德科技有限公司 High tempering softness resistance and high tenacity hot-work die steel and manufacturing method thereof
CN106011420A (en) * 2016-07-20 2016-10-12 东南大学 Preparing method for high-uniformity tool and mould steel
CN107447168A (en) * 2017-08-01 2017-12-08 安徽原动力生产力促进中心有限公司 A kind of wear-resisting type diel steel
CN107557667A (en) * 2017-09-15 2018-01-09 张家港市广大机械锻造有限公司 A kind of large die-casting mould high performance hot-work die steel and its manufacturing process
CN108707730A (en) * 2018-06-13 2018-10-26 东南大学 A kind of mould steel high-efficiency and continuous method for annealing
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CN107557667A (en) * 2017-09-15 2018-01-09 张家港市广大机械锻造有限公司 A kind of large die-casting mould high performance hot-work die steel and its manufacturing process
CN108707730A (en) * 2018-06-13 2018-10-26 东南大学 A kind of mould steel high-efficiency and continuous method for annealing
CN108707730B (en) * 2018-06-13 2020-01-14 东南大学 Efficient continuous annealing method for tool and die steel
CN109280849A (en) * 2018-10-26 2019-01-29 如皋市宏茂重型锻压有限公司 A kind of high performance hot-work die steel and its manufacturing process

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Application publication date: 20160127