CN109852880A - A kind of high heat-intensity hot-work die steel and its manufacturing method - Google Patents

A kind of high heat-intensity hot-work die steel and its manufacturing method Download PDF

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CN109852880A
CN109852880A CN201910023740.XA CN201910023740A CN109852880A CN 109852880 A CN109852880 A CN 109852880A CN 201910023740 A CN201910023740 A CN 201910023740A CN 109852880 A CN109852880 A CN 109852880A
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steel
forging
temperature
work die
die steel
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吴博雅
吴晓春
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Abstract

The present invention relates to a kind of high heat-intensity hot-work die steels, including following alloying element (mass percent): C 0.40~0.45%, Si 0.10~0.30%, Mn 0.30~0.50%, Cr 4.50~5.00%, Mo 2.10~2.50%, V 0.60~0.90%, Co 0.80~1.50%, P≤0.015%, S≤0.002%, surplus are Fe and inevitable impurity.The present invention also provides a kind of preparation of cobalt alloy hot die steel and heat treatment method, including ingredient, smelting, casting, electroslag remeltings;High temperature diffusion annealing, multiway forging hot-working;Conditioning treatment;Final heat treatment.Steel prepared by the present invention improves 4Cr5MoSiV1 steel carbide and is easily roughened the shortcomings that growing up under the high temperature conditions, using cobalt element solid solution strengthening effect and reasonably adjust each composition proportion, in conjunction with suitable preparation method, elevated temperature strength, anti-temper softening performance, thermal fatigue resistance energy and the anti-melting-loss ability energy for greatling improve material meet requirement of the current hot-work die manufacture to material at high temperature comprehensive performance.

Description

A kind of high heat-intensity hot-work die steel and its manufacturing method
Technical field
The present invention relates to a kind of steel alloy and its manufacturing method, in particular to a kind of high heat-intensity hot-work die steel and its system Method is made, steel alloy manufacturing process technology field is belonged to.
Background technique
Hot die steel is primarily used for making the alloy tool steel that the mold of thermal deformation processing is carried out to metal, and heat is made Mold work environment temperature is higher, since long-time works under high-temperature and high-pressure conditions, suffers from and produces because of heating, cooling Raw drawing repeatedly, compression and metal (liquid) flows and the abrasion and corrosion of generation, common failure mode have: heat fatigue, Fracture, plastic deformation, defibrator process undermine Erosion etc..It is therefore desirable to mold materials have high intensity, hardness and thermal stability, Should especially there are high heat-intensity, thermal fatigue, toughness and wearability.
The advantages of domestic common hot die steel is mainly 4Cr5MoSiV1 (H13) at present, the material be have it is opposite Preferable processing performance and obdurability, major defect are that carbide, which is easily roughened, in steel grows up when being more than 600 DEG C using temperature, So that dispersion-strengthened action reduces and leads to material thermal stability and thermal fatigue wretched insufficiency, it is easy to appear Cracking Failure, sternly The stability and efficiency of production are constrained again;In addition to this, domestic high-end hot-work die relies primarily on import, such as Germany at present The DHA series of TQ1, HP1, HTR of Kind&Co company, Japanese DAIDO, Dievar, QRO 90 of Sweden Uddeholm Supreme etc., and import steel grade brings extremely high cost.
With the development of hot die steel field especially drop stamping and Die Casting Industry, high heat-intensity hot-work mold is for each The reduction effect of relevant enterprise production cost and duration are more and more obvious.High heat-intensity means that less unexpected failure may Property, more using mould time, overall lower Master Cost and less repair a die repeatedly, change the mold bring working hour and manpower damage Consumption.Therefore, the deficiency of the especially common hot die steel 4Cr5MoSiV1 high-temperature behavior of hot die steel, seriously constrains pressure Cast the development of industry.Therefore, a high-end, high heat-intensity hot die steel of independent research, it appears particularly important.
Summary of the invention
In view of the above problems, the purpose of the present invention is mention by reasonably adjusting and optimizing chemical component and proportion For a kind of high heat-intensity hot-work die steel and its manufacturing method.Specifically, the present invention is strong based on the heat for promoting hot die steel Property, it provides a kind of alloy proportion that hot die steel is new: increasing appropriate cobalt element newly on the basis of 4Cr5MoSiV1, simultaneously will Molybdenum element content doubles and reduces the content of element silicon, thus greatly improve hot die steel heat resistance (thermal stability, Thermal fatigue and Erosion), a kind of high heat-intensity hot-work die steel containing cobalt is developed, and provide the preparation and heat treatment of the steel Method.
The present invention is achieved by the following technical solutions:
A kind of high heat-intensity hot-work die steel, the raw material including following mass percent meter: carbon C:0.40~0.45%, silicon Si:0.10~0.30%, manganese Mn:0.30~0.50%, chromium Cr:4.50~5.00%, molybdenum Mo:2.10~2.50%, vanadium V: 0.60~0.90%, cobalt Co:0.80~1.50%, phosphorus P :≤0.015%, sulphur S :≤0.002%, surplus is iron Fe and can not keep away The impurity exempted from.
Further, the cobalt Co mass percentage content are as follows: 0.90~1.00%.
Further, the high heat-intensity hot-work die steel, the raw material including following mass percent meter: carbon C:0.40~ 0.42%, silicon Si:0.20~0.30%, manganese Mn:0.30~0.40%, chromium Cr:4.80~5.00%, molybdenum Mo:2.20~ 2.30%, vanadium V:0.60~0.70%, cobalt Co:0.90~1.00%.
The present invention also provides a kind of manufacturing methods of high heat-intensity hot-work die steel, and its step are as follows:
Step 1, steel-making: raw material being put into electric furnace and carries out melting, by refining and vacuum outgas, is then cast into electrode Stick, it is spare by the electrode bar electroslag remelting at ESR ingot;
Step 2, high temperature diffusion annealing: high temperature diffusion annealing is carried out to the ESR ingot;
Step 3, forging: the ESR ingot through high temperature diffusion annealing is subjected to multiway forging processing, forging and molding is forging Base;
Step 4, heat treatment after forging: air-cooled again after using water mist cooling the forging stock of the forging and molding;
Step 5, conditioning treatment: solution treatment is carried out to the forging stock of the forging and molding, then water cooling;Two sections are used again Formula isothermal spheroidizing technique handles the forging stock;
Step 6, final heat treatment: the forging stock after conditioning treatment being placed in vacuum drying oven and carries out austenitizing, high Quenching of calming the anger but is come out of the stove afterwards, then carries out tempering heat treatment.
Further, in the step 2, the high temperature diffusion annealing temperature is 1250~1280 DEG C, and soaking time is at least It is D/50+8 hours, the D is the numerical value using millimeter meter ESR ingot diameter.
Further, in the step 3, forging hammering block preheating temperature is 200~250 DEG C, by the ESR ingot Multiway forging processing is carried out in 1100~1200 DEG C of temperature ranges;Final forging temperature >=900 DEG C, it is preferable that the final forging temperature It is 900~950 DEG C.
Further, in the step 3, upset ratio >=1.8 forged when processing pull out ratio >=6, it is preferable that institute Stating upset ratio is 1.8~2.2, and the pulling is than being 6~8.
Further, in the step 4, the big face center of module or round steel centre of surface area 250 are cooled to using water mist ~300 DEG C, then it is air-cooled to 200~250 DEG C of the big face center of module or round steel centre of surface area.
Further, in the step 5, the temperature of the solution treatment is 1050~1100 DEG C, and then water cooling is to 250 DEG C Below;The first segment temperature of the two-part isothermal spheroidizing technique is 850~890 DEG C;Second segment temperature is 720~780 ℃。
Further, in the step 6, the temperature of the austenitizing is 1030~1060 DEG C, and high pressure gas quenching is cooled to 60 DEG C or less are come out of the stove;Tempering temperature is 540~620 DEG C, and times of tempering is 2~3 times.
In the prior art, the main chemical compositions mass percent of hot die steel 4Cr5MoSiV1 be C 0.32~ 0.45%, Cr4.75~5.50%, Mo 1.20~1.75%, V 0.80~1.20%, Si 0.80~1.20%, Mn 0.20 ~0.50%, P≤0.030%, S≤0.005%.The variation of each ingredient and its content has played the tissue and performance of steel Benefit effect and unfavorable effect, target of the present invention are to invent a kind of hot die steel substitution for having more high heat-intensity 4Cr5MoSiV1 takes the strong point of each element, evades its weakness, reasonably adjusts and optimizes chemical component and proportion, obtain one The new good alloy proportion of kind, emphasis consider as follows:
(1) effect of Co element: increasing the content of cobalt element on the basis of hot die steel H13, this element is dissolved in material Material matrix can significantly improve the structure stability of steel at high operating temperatures, while refining the alloy carbide being precipitated when tempering can be bright It is aobvious to improve its dispersion-strengthened action, all play the role of for the improvement of material heat resistance positive;But Co too high levels may also It can make the degraded toughness of material.
(2) effect of Mo element: it is appropriate to promote Mo constituent content, perlitic transformation can be effectively postponed, steel can be improved and added Work and heat treatment performance.Simultaneously as molybdenum system carbide is relatively stable, it is not easy grow up during military service roughening and occurrence type Transformation, thus can enhance steel dispersion-strengthened action and reinforcing material heat resistance;Mo and Cr, Mn cooperation are added simultaneously, interaction Effect is remarkably improved the harden ability of steel.Mo content is too low, and high temperature thermostability is unobvious, Mo too high levels, and hot-working character becomes Difference.
(3) effect of Si element: this element is as non-carbide forming element in the extreme building ring for requiring high heat-intensity Border lower substrate invigoration effect is not significant, while element silicon can reduce the toughness of material, is not added more preferably particularly as alloying element; Therefore silicon content is suitably reduced in the present invention.
(4) content of Cr element: chromium can postpone perlitic transformation strongly, be conducive to harden ability and the horse of improving material The temper resistance of family name's body, but because its carbide is easily roughened, there is certain harmful effect for heat resistance, therefore in the present invention By the content of suitable control chromium, lower limit of the scope control in 4Cr5MoSiV1.
(5) effect of C element: carbon is the one of the chief elements of high-performance hot die steel for die-casting, is to improve steel The most effective element of hardness and strength, also influence steel component segregation and structural homogenity, while tempering when be precipitated rise All kinds of carbide such as chromium, molybdenum, the vanadium of dispersion-strengthened action are the basic standards that hot-work die Steel Properties touch the mark.Meanwhile it is suitable It can prevent steel from generating segregation tissue in process of setting to cause the uneven of the hardness of steel and impact when reducing content Toughness.
(6) effect of V element: as the deoxidier of steel, when up to 0.5% or more can obvious thinning microstructure crystal grain, improve steel Intensity and toughness, and the corrosive power (H corrosion) of steel can be improved at high temperature with the C carbide formed.
(7) effect of Mn element: having preferable deoxidation and S gone to act on, although high-content can increase wearability, MnS meeting Reduce anticorrosive and welding performance.
(8) P, S: being the harmful element in steel, and P, easily in grain boundaries segregation, causes the cold brittleness of steel to increase, S in steel Exist in steel with sulphided form, be also easy to produce hot-short, reduces the lateral extension and toughness properties of steel, therefore should be as low as possible.
On the basis of the above, compared with prior art, the beneficial effects of the present invention are:
(1) present invention by addition cobalt element and adjusts each element ingredient, improve and stabilizes hot die steel of the present invention Processing performance, i.e. harden ability and hardenability, two kinds of performances be also determine material whether be high-quality hot-work die steel weight Want standard.For harden ability, 4Cr5MoSiV1 itself has excellent harden ability, and the present invention increases molybdenum carburetting drop silicon on this basis Harden ability is had little effect, and increases amount containing cobalt in steel of the present invention and also has no negative effect, therefore this for harden ability Invention material has excellent harden ability;For hardenability, in addition to carbon, element silicon and vanadium have austenite phosphorus content Obviously reduction act on.Therefore, the present invention strictly limits the upper limit of element silicon, while the control of the content of vanadium being existed A certain range, and due to the cobalt element being newly added and the molybdenum element being incrementally added all have for austenite phosphorus content it is a small amount of Reduction effect, therefore the phosphorus content of this material is improved slightly.It is computed, minimum Austria that material of the present invention is quenched at 1060 DEG C Family name's body phosphorus content shows that hardenability is outstanding up to 0.35%, and stablizes in composition range;In contrast under same technique The austenite phosphorus content of 4Cr5MoSiV1 is 0.29%, and very unstable in composition range.Therefore using this programme at Divide material made of range that there is preferable processing performance and reproducibility.
(2) currently used 4Cr5MoSiV1 is significantly improved since carbide is unstable caused in drawing process Heat resistance is insufficient, and the more common 4Cr5MoSiV1 of hardness decaying can be postponed more than 20%, in heat fatigue in high-temperature thermal stability test The quantity and depth that face crack occurs in test have apparent reduction, and material is by molten aluminum in the test of Erosion Properties It corrodes and reduceds weight can reduce 30% or more, while same level at its impact flexibility and 4Cr5MoSiV1.With 4Cr5MoSiV1 is compared, and steel of the present invention has more preferably high temperature heat resistance, is suitable for high-end die casting hot-work die, also be can be used for The manufacture of hot stamping die.
(3) on the basis of reasonable chemical component matches, excellent manufacturing process of arranging in pairs or groups, so that the high performance index of steel obtains To guarantee, improves 4Cr5MoSiV1 steel carbide and be easily roughened the shortcomings that growing up under the high temperature conditions, utilize the solid solution of cobalt element Strengthening effect greatlys improve the elevated temperature strength of material, anti-temper softening performance, thermal fatigue resistance energy and anti-melting-loss ability energy, Meet requirement of the current hot-work die manufacture to material at high temperature comprehensive performance.
(4) a kind of hot-work die steel material of excellent performance is provided, the high-end steel bring sky high cost of import is reduced.
It should be understood that above-mentioned each technical characteristic of the invention and having in below (eg embodiment) within the scope of the present invention It can be combined with each other between each technical characteristic of body description, to form a new or preferred technical solution.As space is limited, exist This no longer tires out one by one states.So all do not depart from the equivalent or modification completed under principles of this disclosure, this hair is both fallen within The range of bright protection.
Below with reference to attached drawing, the invention will be further described, with absolutely prove the purpose of the present invention, technical characteristic and Technical effect.
Detailed description of the invention
Fig. 1 shows the annealing metallographic structure for the steel being prepared in preferred embodiment of the present invention.
Fig. 2 shows the quenching metallographic structures for the steel being prepared in preferred embodiment of the present invention.
Fig. 3 shows the steel belt roof bolt metallographic structure being prepared in preferred embodiment of the present invention.
Fig. 4 shows the steel being prepared in preferred embodiment of the present invention and 4Cr5MoSiV1 steel under 1060 DEG C of quenchings Tempering characteristics curve comparison.
Fig. 5 shows the steel and 620 DEG C of anti-temper softenings of 4Cr5MoSiV1 steel being prepared in preferred embodiment of the present invention Performance comparison.
Fig. 6 shows the steel being prepared in preferred embodiment of the present invention can be right with 4Cr5MoSiV1 steel anti-melting-loss ability Than.
Specific embodiment
Technical solution of the present invention will be clearly and completely described below, it is clear that described embodiment is this hair Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.In addition, below Technical characteristic involved in described different embodiments of the present invention as long as they do not conflict with each other can be mutual In conjunction with.
In embodiment, unless otherwise instructed, used technological means is ordinary skill in the art means.Implement below The object of the invention can be achieved in example 1-6.
Embodiment 1
The steel of the present embodiment, chemical component are calculated as with weight %: carbon C:0.44%, silicon Si:0.30%, manganese Mn:0.48%, Chromium Cr:4.52%, molybdenum Mo:2.15%, vanadium V:0.85%, cobalt Co:1.40%, phosphorus P:0.009%, sulphur S:0.002%, surplus are Iron Fe and inevitable impurity.
In the present embodiment, the manufacturing process of hot die steel and steps are as follows:
Step 1, electric furnace smelting: melting is carried out in electric furnace by above-mentioned alloying element proportion, smelting temperature is greater than 1500 DEG C, then pass through vacuum outgas, is then cast into electrode bar, last electroslag remelting is spare at φ 600mm ESR ingot.
Step 2, high temperature diffusion annealing: ESR ingot is heated to 1257 DEG C of heat preservations, 20 hours progress high temperature diffusion annealings, Even tissue eliminates alloying component segregation and Aliquation carbide.
Step 3, forging: forging is preheated to 200~250 DEG C with hammering block, is then adjusted to above-mentioned ESR ingot temperature Progress multiway forging processing in 1200 DEG C of temperature ranges, 900 DEG C of final forging temperature;Upset ratio >=1.8 pull out ratio >=6,.
Step 4, cooling after forged: it is cold using water mist, it is cooled to the big face center of module or round steel centre of surface area 250~300 DEG C or so, then it is air-cooled to 200~250 DEG C or so of the big face center of module or round steel centre of surface area.
Step 5, conditioning treatment: by the forging stock (300 × 800mm of sectional dimension) after forging and molding be heated to 1100 DEG C into Row solution treatment is air-cooled to 900 DEG C of the big face center of module or round steel centre of surface area, is then placed in sink and carries out after coming out of the stove Water cooling is cooled to 250 DEG C or less.Then use two-part isothermal spheroidizing technique: first segment temperature is 875 DEG C;Second segment temperature Degree is 765 DEG C.
Step 6, final heat treatment: taking 60 × 60 × 120mm sample from the module ends central area after conditioning treatment, Workpiece is heated to 1060 DEG C of progress austenitizings in a vacuum furnace, 80 DEG C or less is cooled to using high pressure gas quenching and comes out of the stove;Then Carry out 540 DEG C, 600 DEG C and 550 DEG C tempering heat treatments three times.
By above-mentioned manufacturing process, according to after above-mentioned heat treatment method annealing metallographic structure, quenching metallographic structure and return Fiery metallographic structure is respectively as shown in attached drawing 1, attached drawing 2, attached drawing 3.
Embodiment 2
The steel of the present embodiment, chemical component are calculated as with weight %: carbon C:0.41%, silicon Si:0.10%, manganese Mn:0.32%, Chromium Cr:4.95%, molybdenum Mo:2.49%, vanadium V:0.61%, cobalt Co:0.80%, phosphorus P:0.010%, sulphur S:0.002%, surplus are Iron Fe and inevitable impurity.
The manufacturing method of steel is the same as embodiment 1.
Embodiment 3
The steel of the present embodiment, chemical component are calculated as with weight %: carbon C:0.42%, silicon Si:0.20%, manganese Mn:0.40%, Chromium Cr:4.85%, molybdenum Mo:2.25%, vanadium V:0.63%, cobalt Co:0.92%, phosphorus P:0.010%, sulphur S:0.002%, surplus are Iron Fe and inevitable impurity.
The manufacturing method of steel is the same as embodiment 1.
Embodiment 4
The steel of the present embodiment, chemical component are calculated as with weight %: carbon C:0.42%, silicon Si:0.23%, manganese Mn:0.44%, Chromium Cr:4.86%, molybdenum Mo:2.29%, vanadium V:0.68%, cobalt Co:0.99%, phosphorus P:0.015%, sulphur S:0.002%, surplus are Iron Fe and inevitable impurity.
The manufacturing method of steel is the same as embodiment 1.
Embodiment 5
The composition of steel composition of the present embodiment is same as Example 1.The manufacturing method of steel is as follows:
Step 1, electric furnace smelting: melting is carried out in electric furnace by above-mentioned alloying element proportion, smelting temperature is greater than 1500 DEG C, then pass through vacuum outgas, is then cast into electrode bar, last electroslag remelting is spare at φ 600mm ESR ingot.
Step 2, high temperature diffusion annealing: ESR ingot is heated to 1257 DEG C of heat preservations, 20 hours progress high temperature diffusion annealings, Even tissue eliminates alloying component segregation and Aliquation carbide.
Step 3, forging: forging is preheated to 230 DEG C with hammering block, above-mentioned ESR ingot temperature is then adjusted to 1200 DEG C of temperature It spends and carries out multiway forging processing in range, 920 DEG C of final forging temperature;Upset ratio is 2.2, and pulling is than being 7.2.
Step 4, cooling after forged: it is cold using water mist, it is cooled to the big face center of module or round steel centre of surface area 250~300 DEG C or so, then it is air-cooled to 200~250 DEG C or so of the big face center of module or round steel centre of surface area.
Step 5, conditioning treatment: by the forging stock (300 × 800mm of sectional dimension) after forging and molding be heated to 1100 DEG C into Row solution treatment is air-cooled to 900 DEG C of the big face center of module or round steel centre of surface area, is then placed in sink and carries out after coming out of the stove Water cooling is cooled to 250 DEG C or less.Then use two-part isothermal spheroidizing technique: first segment temperature is 850 DEG C;Second segment temperature Degree is 720 DEG C.
Step 6, final heat treatment: taking 60 × 60 × 120mm sample from the module ends central area after conditioning treatment, Workpiece is heated to 1030 DEG C of progress austenitizings in a vacuum furnace, 60 DEG C or less is cooled to using high pressure gas quenching and comes out of the stove;Then Carry out 540 DEG C, 620 DEG C and 550 DEG C tempering heat treatments three times.
Embodiment 6
The composition of steel composition of the present embodiment is identical as case study on implementation 1.The manufacturing method of steel is as follows:
Step 1, electric furnace smelting: melting is carried out in electric furnace by above-mentioned alloying element proportion, smelting temperature is greater than 1500 DEG C, then pass through vacuum outgas, is then cast into electrode bar, last electroslag remelting is spare at φ 600mm ESR ingot.
Step 2, high temperature diffusion annealing: ESR ingot is heated to 1257 DEG C of heat preservations, 20 hours progress high temperature diffusion annealings, Even tissue eliminates alloying component segregation and Aliquation carbide.
Step 3, forging: forging is preheated to 245 DEG C with hammering block, above-mentioned ESR ingot temperature is then adjusted to 1200 DEG C of temperature It spends and carries out multiway forging processing in range, 950 DEG C of final forging temperature;Upset ratio is 2, and pulling is than being 6.
Step 4, cooling after forged: it is cold using water mist, it is cooled to the big face center of module or round steel centre of surface area 250~300 DEG C or so, then it is air-cooled to 200~250 DEG C or so of the big face center of module or round steel centre of surface area.
Step 5, conditioning treatment: by the forging stock (300 × 800mm of sectional dimension) after forging and molding be heated to 1080 DEG C into Row solution treatment is air-cooled to 900 DEG C of the big face center of module or round steel centre of surface area, is then placed in sink and carries out after coming out of the stove Water cooling is cooled to 250 DEG C or less.Then use two-part isothermal spheroidizing technique: first segment temperature is 890 DEG C;Second segment temperature Degree is 780 DEG C.
Step 6, final heat treatment: taking 60 × 60 × 120mm sample from the module ends central area after conditioning treatment, Workpiece is heated to 1050 DEG C of progress austenitizings in a vacuum furnace, 65 DEG C or so is cooled to using high pressure gas quenching and comes out of the stove;Then Carry out 540 DEG C, 550 DEG C of double tempering heat treatments.
Comparative example 1
Commercial product 4Cr5MoSiV1 steel (H13).
Test example performance test
A. tempering characteristics
The characteristic that embodiment 1-2 and comparative example 1 (H13) change in 1060 DEG C of quenched tempering hardnesses with tempering temperature is bent Line, as shown in Fig. 4.
B. hardness test
Steel made from embodiment 1,2 is measured, quenching hardness: 54.0~56.0HRC, 46.0~48.0HRC of tempering hardness.
C. anti-temper softening performance is tested
Through above-mentioned performance test, it is seen then that the present embodiment 1,2 steel have apparent advantage compared with H13 steel, and 620 DEG C resist back Fiery softening performance comparison is as shown in Fig. 5.The steel being prepared in the present embodiment 1,2 is under the conditions of 620 DEG C and 4Cr5MoSiV1 Stability contrast experiment is carried out, 4Cr5MoSiV1 makes its hardness number and the present embodiment 1,2 steel close after tempering of quenching, It is 47HRC or so.In 620 DEG C of heat preservation 23h, the present embodiment steel hardness drops to 35.2HRC from 46.0HRC, and the range of decrease is 10.8HRC.Opposite, 4Cr5MoSiV1 hardness drops to 31.8HRC, range of decrease 14.2HRC from 46.0HRC.
D. anti-melting-loss ability energy
The steel and 4Cr5MoSiV1 being prepared in the present embodiment 1,2 are in 700 DEG C of molten aluminums with the speed of 120r/min, rotation Turn radius 25mm, carries out respectively 10 minutes, 20 minutes and 30 minutes, measure the quality of sample lost.The present embodiment steel melting loss matter Amount is respectively 1.16,2.01 and 3.69g, hence it is evident that less than the 1.69,2.99 and 4.36 of 4Cr5MoSiV1.Embodiment 1,2 with 4Cr5MoSiV1 steel anti-melting-loss ability can compare as shown in Fig. 6.
E. impact flexibility
According to NADCA#207-90 standard sample, specimen size is 7 × 10 × 55mm, carries out non-notch test.Room temperature punching Hit work value: 360~385J.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Scheme, all should be within the scope of protection determined by the claims.

Claims (10)

1. a kind of high heat-intensity hot-work die steel, which is characterized in that the raw material including following mass percent meter: carbon C:0.40~ 0.45%, silicon Si:0.10~0.30%, manganese Mn:0.30~0.50%, chromium Cr:4.50~5.00%, molybdenum Mo:2.10~ 2.50%, vanadium V:0.60~0.90%, cobalt Co:0.80~1.50%, phosphorus P :≤0.015%, sulphur S :≤0.002%, surplus is Iron Fe and inevitable impurity.
2. high heat-intensity hot-work die steel as described in claim 1, which is characterized in that the cobalt Co content are as follows: 0.90~ 1.00%.
3. high heat-intensity hot-work die steel as claimed in claim 2, which is characterized in that carbon C:0.40~0.42%, institute State silicon Si:0.20~0.30%, manganese Mn:0.30~0.40%, chromium Cr:4.80~5.00%, the molybdenum Mo:2.20 ~2.30%, vanadium V:0.60~0.70%, cobalt Co:0.90~1.00%.
4. a kind of manufacturing method of high heat-intensity hot-work die steel as described in any one of claims 1-3, which is characterized in that its Steps are as follows:
Step 1, steel-making: raw material being put into electric furnace and carries out melting, by refining and vacuum outgas, is then cast into electrode bar, It is spare by the electrode bar electroslag remelting at ESR ingot;
Step 2, high temperature diffusion annealing: high temperature diffusion annealing is carried out to the ESR ingot;
Step 3, forging: the ESR ingot through high temperature diffusion annealing is subjected to multiway forging processing, forging and molding is forging stock;
Step 4, heat treatment after forging: air-cooled again after using water mist cooling the forging stock of the forging and molding;
Step 5, conditioning treatment: solution treatment is carried out to the forging stock of the forging and molding, then water cooling;Again using two-part etc. Warm annealing process handles the forging stock;
Step 6, final heat treatment: the forging stock after conditioning treatment being placed in vacuum drying oven and carries out austenitizing, high pressure gas Quenching is but come out of the stove afterwards, then carries out tempering heat treatment.
5. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 2, institute Stating high temperature diffusion annealing temperature is 1250~1280 DEG C, and soaking time is at least D/50+8 hours, and the D is using millimeter meter electricity The numerical value of slag ingot diameter.
6. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 3, institute Stating forging hammering block preheating temperature is 200~250 DEG C, the ESR ingot is carried out in 1100~1200 DEG C of temperature ranges multidirectional Forging processing;Final forging temperature >=900 DEG C.
7. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 3, upsetting Thick ratio >=1.8, pull out ratio >=6.
8. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 4, adopt Be cooled to 250~300 DEG C of the big face center of module or round steel centre of surface area with water mist, then be air-cooled to the big face center of module or 200~250 DEG C of round steel centre of surface area.
9. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 5, institute The temperature for stating solution treatment is 1050~1100 DEG C, and then water cooling is to 250 DEG C or less;The two-part isothermal spheroidizing technique First segment temperature be 850~890 DEG C;Second segment temperature is 720~780 DEG C.
10. the manufacturing method of high heat-intensity hot-work die steel as claimed in claim 4, which is characterized in that in the step 6, The temperature of the austenitizing is 1030~1060 DEG C, and high pressure gas quenching is cooled to 80 DEG C or less and comes out of the stove;Tempering temperature be 540~ 620 DEG C, times of tempering is 2~3 times.
CN201910023740.XA 2019-01-10 2019-01-10 A kind of high heat-intensity hot-work die steel and its manufacturing method Pending CN109852880A (en)

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CN111534662A (en) * 2020-06-12 2020-08-14 河北鑫泰轴承锻造有限公司 DHRE round steel production process
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