CN110306108A - A kind of high tenacity high cracking resistance hot die steel and its manufacturing method - Google Patents
A kind of high tenacity high cracking resistance hot die steel and its manufacturing method Download PDFInfo
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- CN110306108A CN110306108A CN201910602981.XA CN201910602981A CN110306108A CN 110306108 A CN110306108 A CN 110306108A CN 201910602981 A CN201910602981 A CN 201910602981A CN 110306108 A CN110306108 A CN 110306108A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a kind of high tenacity high cracking resistance hot die steel and its manufacturing methods, its raw material of the invention includes: 0.32-0.42 parts of C by weight, 0.1-0.5 parts of Si, 0.2-0.6 parts of Mn, Cr4.7-5.3 parts, 1.5-2.5 parts of Mo, 0.5-1.0 parts of V, 0.6-1.8 parts of Ni, 0.01-0.02 parts of P, 0.0005-0.001 parts of S and Fe surplus, the preparation process of inventive die steel is as follows: ingredient is smelted, ladle refining, vacuum outgas, casting, atmosphere protected electro-slag re-melting, High temperature diffusion, multiway forging, fine grain heat treatment, spheroidizing, the present invention relates to technical field of mold steel.The high tenacity high cracking resistance hot die steel and its manufacturing method, the present invention has the advantages that available matrix is pure, even tissue, the hot die steel without bulk primary carbide, steel grade toughness of the present invention is splendid compared with H13 steel, elevated temperature strength is excellent, harden ability and temper resistance are good, with excellent thermal crack resistance performance, suitable for the operating condition having higher requirements to thermal fatigue property.
Description
Technical field
The present invention relates to technical field of mold steel, specially a kind of high tenacity high cracking resistance hot die steel and its manufacturer
Method.
Background technique
Mold machine-shaping have high production efficiency, it is high-quality, save material and the series of advantages such as at low cost, using model
It encloses and its extensively, hot die steel, which refers to, to be suitable for carrying out steel alloy used in the mold of thermal deformation processing to metals such as magnaliums,
Such as hot-forging die, hot extruding die, compression mod.Hot-work die works under the conditions of high temperature and pressure and cooling cycle for a long time, therefore
It is required that mold materials have high toughness, intensity and thermal stability, especially should there are higher cold-heat fatigue property and heat resistanceheat resistant to open
Fragility energy proposes the performance of hot die steel currently, hot-work die develops to large-scale, accurate, the long-life direction
Higher requirement, H13 steel are no longer satisfied client to the requirement of mold performance, and the present invention is reduced based on H13 steel
Si, V content, mention high Mo content, add certain Ni element to steel grade and carry out Alloying Design.
The present invention is by reducing Si, V content is conducive to control the primary carbide type in mould steel, weakens primary carbonization
Influence of the object to subsequent technique and properties of product, improves the toughness of mould steel；The high temperature that material can be improved in addition Mo element is strong
Degree, anti-temper resistance and cold-heat fatigue property；Addition Ni element, which carries out alloying, to be reduced phase point temperature, obtains martensite
Critical cooling rate it is lower, mould steel can be made to obtain higher harden ability and impact flexibility, to obtain more preferably comprehensive
Can, steel grade of the present invention has high tenacity, high-hardenability, temper resistance and having excellent high-temperature strength, thermal fatigue resistance energy and resists
Thermal cracking performance is obviously improved, and is especially suitable for the production of medium-and-large-sized hot-work die.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of high tenacity high cracking resistance hot die steel and its manufacturers
Method, solving existing H13 steel and not being able to satisfy has asking for high toughness, intensity and thermal stability requirement to mold materials
Topic.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of high tenacity high cracking resistance heat work
Mould steel, raw material include: 0.32-0.42 parts of C, 0.1-0.5 parts of Si, 0.2-0.6 parts of Mn, Cr 4.7- by weight
5.3 parts, 1.5-2.5 parts of Mo, 0.5-1.0 parts of V, 0.6-1.8 parts of Ni, 0.01-0.02 parts of P, 0.0005-0.001 parts of S and
Fe surplus.
Preferably, raw material includes following component: 0.37 part of C, 0.3 part of Si, 0.4 part of Mn, 5 parts of Cr, 2 parts of Mo, V
0.7 part, 1 part of Ni, 0.015 part of P, 0.0007 part of S and Fe surplus.
Preferably, raw material includes following component: 0.32 part of C, 0.1 part of Si, 0.2 part of Mn, 5.3 parts of Cr, Mo 2.5
Part, 0.5 part of V, 0.6 part of Ni, 0.01 part of P, 0.0005 part of S and Fe surplus.
Preferably, raw material includes following component: 0.42 part of C, 0.5 part of Si, 0.6 part of Mn, 4.7 parts of Cr, Mo 1.5
Part, 1.0 parts of V, 1.5 parts, P0.02 parts, S0.001 parts of Ni and Fe surplus.
The invention also discloses a kind of manufacturing methods of high tenacity high cracking resistance hot die steel, specifically include following step
It is rapid:
S1, ingredient are smelted: the steel scrap prepared and ferroalloy raw material being carried out melting using smelting furnace, carried out after melting
The pushing off the slag and deoxidier that corresponding weight ratio part is added is tapped；
S2, ladle refining: alloying component is adjusted by LF refining, and the deoxidier and refining slag of corresponding weight ratio part is added
Deoxidation and desulfurization are carried out, control S is less than or equal to 0.003%；
S3, vacuum outgas and casting: N, H, O elemental gas content in molten steel, vacuum are reduced using VD vacuum outgas equipment
Degree is adjusted within the scope of 50-67Pa, degassing time 20-30min, then using bet method under the protection of argon gas by molten steel
It is cast for the ingot shape needed；
S4, atmosphere protected electro-slag re-melting: the ingot casting in step S3 is further mentioned by atmosphere protected electro-slag re-melting
Pure, the degree of purity for improving steel makes sulfur content be reduced to 0.0005-0.001%, meets degree of purity grade and makees to high-duty cast heat
The requirement of mould steel, and improve steel ingot compactness and structural homogenity, slow cooling is carried out to steel ingot after melting or in 700-820
DEG C heat preservation is annealed；
S5, High temperature diffusion: carrying out High temperature diffusion for steel ingot at 1180-1280 DEG C, soaking time 15-20h, eliminate or
Aliquation carbide, mitigation interdendritic element segregation in process of setting；
S6, multiway forging: carrying out multiway forging after steel ingot is kept the temperature, full and uniform tissue is crushed original coarse grain, forges
After be rapidly cooled；
S7, fine grain heat treatment technics: it by the blank after forging in 1010-1130 DEG C of heat preservation 15-20h, is then quickly cooled to
300-500 DEG C, inhibit proeutectoid carbide along the precipitation of crystal boundary, and net carbide is avoided to generate；
S8, spheroidizing: shove charge is annealed after being cooled to relevant temperature, and using isothermal spheroidizing, heating temperature is
Between 720-880 DEG C, the soaking time of isothermal section is no less than 15h, and 400 DEG C or less are slowly cooled to after isothermal and is come out of the stove.
Preferably, smelting furnace is one of converter, electric furnace or induction furnace in the step S1.
Preferably, the requirement that degree of purity grade need to meet in the step S4 is NADCA#207-2008.
Preferably, initial forging temperature is 1170-1220 DEG C in the step S6, and total forging ratio need to be more than or equal to 6, and final forging temperature needs
More than or equal to 850 DEG C.
Preferably, in the step S8 when mould steel heat treatment hardness is 45-48HRC, the impact of core transverse direction non-notch
Toughness is more than or equal to 350J, and tensile strength is more than or equal to 1350MPa, and cool-hot fatigue crack number is few, length is short, has compared with H13 steel
There is more preferably elevated temperature strength.
(3) beneficial effect
The present invention provides a kind of high tenacity high cracking resistance hot die steel and its manufacturing methods.Have compared with prior art
It is standby following the utility model has the advantages that the high tenacity high cracking resistance hot die steel and its manufacturing method, raw material include: C by weight
0.32-0.42 parts, 0.1-0.5 parts of Si, 0.2-0.6 parts of Mn, 4.7-5.3 parts of Cr, 1.5-2.5 parts of Mo, 0.5-1.0 parts of V,
0.6-1.8 parts of Ni, 0.01-0.02 parts of P, 0.0005-0.001 parts of S and Fe surplus are, it can be achieved that by utilizing the compound conjunction of Ni-Mo
Aurification sufficiently improves the performances such as the toughness, harden ability and hot-cracking resistance of mould steel, guarantees the tissue of die & mold treatment, hardness and
Even property makes inventive die have superior comprehensive performance, with existing H13 steel phase in conjunction with purifying melting and multiway forging technology
Than the present invention has high tenacity and harden ability, good intensity and thermal crack resistance performance, uniform heat-treated sturcture and hardness
Hot die steel, the mold of steel grade of the present invention production be processed into industrial conditions compression mod especially medium-and-large-sized compression mod when table
Reveal service life more superior than H13, the service life of modified H13 even common compared with H13 improves 30-200%, has more
Good elevated temperature strength and toughness matches, and the ability that crackle is formed and extended is resisted under cold cycling operating condition and is increased dramatically,
High tenacity high cracking resistance hot die steel is provided for China's die industry, promotes mold manufacture level and the market competitiveness.
Detailed description of the invention
Fig. 1 is the metallographic structure schematic diagram of high tenacity high cracking resistance hot die steel of the present invention；
Fig. 2 is the data line chart of the v-notch ballistic work of high tenacity high cracking resistance hot die steel of the present invention；
Fig. 3 is the data line chart of the non-notch ballistic work of high tenacity high cracking resistance hot die steel of the present invention；
Fig. 4 is the mechanical performance data table figure of high tenacity high cracking resistance hot die steel of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the embodiment of the present invention provides a kind of three kinds of technical solutions: high tenacity high cracking resistance hot die steel
Manufacturing method, specifically include following embodiment:
Embodiment 1
The raw material of the high tenacity high cracking resistance hot die steel includes: 0.37 part of C, 0.3 part of Si, Mn by weight
0.4 part, 5 parts of Cr, 2 parts of Mo, 0.7 part of V, 1 part of Ni, 0.015 part of P, 0.0007 part of S and Fe surplus.
S1, ingredient are smelted: the steel scrap prepared and ferroalloy raw material being carried out melting using smelting furnace, carried out after melting
The pushing off the slag and deoxidier that corresponding weight ratio part is added is tapped, smelting furnace is converter；
S2, ladle refining: alloying component is adjusted by LF refining, and the deoxidier and refining slag of corresponding weight ratio part is added
Deoxidation and desulfurization are carried out, control S is 0.001%；
S3, vacuum outgas and casting: N, H, O elemental gas content in molten steel, vacuum are reduced using VD vacuum outgas equipment
Degree is adjusted within the scope of 58Pa, degassing time 25min, is then under the protection of argon gas cast for molten steel using bet method
The ingot shape needed；
S4, atmosphere protected electro-slag re-melting: the ingot casting in step S3 is further mentioned by atmosphere protected electro-slag re-melting
Pure, the degree of purity for improving steel makes sulfur content be reduced to 0.0007%, meets degree of purity grade to high-duty cast hot die steel
Requirement, and improve steel ingot compactness and structural homogenity, slow cooling carried out to steel ingot after melting or in 780 DEG C of heat preservations progress
Annealing, the requirement that degree of purity grade need to meet are NADCA#207-2008；
S5, High temperature diffusion: steel ingot is subjected to High temperature diffusion, soaking time 17h, elimination or process of setting at 1230 DEG C
Middle Aliquation carbide mitigates interdendritic element segregation；
S6, multiway forging: carrying out multiway forging after steel ingot is kept the temperature, full and uniform tissue is crushed original coarse grain, forges
After be rapidly cooled, initial forging temperature be 1170 DEG C, total forging ratio be 6, final forging temperature need to be 860 DEG C；
S7, fine grain heat treatment technics: by the blank after forging in 1020 DEG C of heat preservation 17h, 400 DEG C are then quickly cooled to, suppression
Proeutectoid carbide processed and avoids net carbide from generating along the precipitation of crystal boundary；
S8, spheroidizing: shove charge is annealed after being cooled to relevant temperature, and using isothermal spheroidizing, heating temperature is
820 DEG C, the soaking time of isothermal section is 15h, slowly cools to 200 DEG C after isothermal and comes out of the stove, when mould steel heat treatment hardness
When for 47HRC, core transverse direction non-notch impact flexibility is 385J, tensile strength 1470MPa.
Embodiment 2
The raw material of the high tenacity high cracking resistance hot die steel includes: 0.32 part of C, 0.1 part of Si, Mn by weight
0.2 part, 5.3 parts of Cr, 2.5 parts of Mo, 0.5 part of V, 0.6 part of Ni, 0.01 part of P, 0.0005 part of S and Fe surplus.
S1, ingredient are smelted: the steel scrap prepared and ferroalloy raw material being carried out melting using smelting furnace, carried out after melting
The pushing off the slag and deoxidier that corresponding weight ratio part is added is tapped, smelting furnace is electric furnace；
S2, ladle refining: alloying component is adjusted by LF refining, and the deoxidier and refining slag of corresponding weight ratio part is added
Deoxidation and desulfurization are carried out, control S is 0.002%；
S3, vacuum outgas and casting: N, H, O elemental gas content in molten steel, vacuum are reduced using VD vacuum outgas equipment
Degree is adjusted within the scope of 50Pa, degassing time 20min, is then under the protection of argon gas cast for molten steel using bet method
The ingot shape needed；
S4, atmosphere protected electro-slag re-melting: the ingot casting in step S3 is further mentioned by atmosphere protected electro-slag re-melting
Pure, the degree of purity for improving steel makes sulfur content be reduced to 0.0005%, meets degree of purity grade to high-duty cast hot die steel
Requirement, and improve steel ingot compactness and structural homogenity, slow cooling carried out to steel ingot after melting or in 700 DEG C of heat preservations progress
Annealing, the requirement that degree of purity grade need to meet are NADCA#207-2008；
S5, High temperature diffusion: steel ingot is subjected to High temperature diffusion, soaking time 15h, elimination or process of setting at 1250 DEG C
Middle Aliquation carbide mitigates interdendritic element segregation；
S6, multiway forging: carrying out multiway forging after steel ingot is kept the temperature, full and uniform tissue is crushed original coarse grain, forges
After be rapidly cooled, initial forging temperature be 1190 DEG C, total forging ratio be 7, final forging temperature be 890 DEG C；
S7, fine grain heat treatment technics: by the blank after forging in 1080 DEG C of heat preservation 15h, 300 DEG C are then quickly cooled to, suppression
Proeutectoid carbide processed and avoids net carbide from generating along the precipitation of crystal boundary；
S8, spheroidizing: shove charge is annealed after being cooled to relevant temperature, and using isothermal spheroidizing, heating temperature is
740 DEG C, the soaking time of isothermal section is 16h, slowly cools to 300 DEG C after isothermal and comes out of the stove, when mould steel heat treatment hardness
When for 45HRC, core transverse direction non-notch impact flexibility is 420J, tensile strength 1450MPa.
Embodiment 3
The raw material of the high tenacity high cracking resistance hot die steel includes: 0.42 part of C, 0.5 part of Si, Mn by weight
0.6 part, 4.7 parts of Cr, 1.5 parts of Mo, 1.0 parts of V, 1.5 parts, P0.02 parts, S0.001 parts of Ni and Fe surplus.
S1, ingredient are smelted: the steel scrap prepared and ferroalloy raw material being carried out melting using smelting furnace, carried out after melting
The pushing off the slag and deoxidier that corresponding weight ratio part is added is tapped, smelting furnace is induction furnace；
S2, ladle refining: alloying component is adjusted by LF refining, and the deoxidier and refining slag of corresponding weight ratio part is added
Deoxidation and desulfurization are carried out, control S is 0.003%；
S3, vacuum outgas and casting: N, H, O elemental gas content in molten steel, vacuum are reduced using VD vacuum outgas equipment
Degree is adjusted within the scope of 67Pa, degassing time 30min, is then under the protection of argon gas cast for molten steel using bet method
The ingot shape needed；
S4, atmosphere protected electro-slag re-melting: the ingot casting in step S3 is further mentioned by atmosphere protected electro-slag re-melting
Pure, the degree of purity for improving steel makes sulfur content be reduced to 0.001%, meets degree of purity grade to high-duty cast hot die steel
It is required that and improving steel ingot compactness and structural homogenity, carrying out slow cooling to steel ingot after melting or being moved back in 820 DEG C of heat preservations
Fire, the requirement that degree of purity grade need to meet are NADCA#207-2008；
S5, High temperature diffusion: steel ingot is subjected to High temperature diffusion, soaking time 15h, elimination or process of setting at 1260 DEG C
Middle Aliquation carbide mitigates interdendritic element segregation；
S6, multiway forging: carrying out multiway forging after steel ingot is kept the temperature, full and uniform tissue is crushed original coarse grain, forges
After be rapidly cooled, initial forging temperature be 1200 DEG C, total forging ratio be 8, final forging temperature be 900 DEG C；
S7, fine grain heat treatment technics: by the blank after forging in 1050 DEG C of heat preservation 20h, 500 DEG C are then quickly cooled to, suppression
Proeutectoid carbide processed and avoids net carbide from generating along the precipitation of crystal boundary；
S8, spheroidizing: shove charge is annealed after being cooled to relevant temperature, and using isothermal spheroidizing, heating temperature is
Between 840 DEG C, the soaking time of isothermal section is 17h, slowly cools to 400 DEG C after isothermal and comes out of the stove, when mold steel heat treatment
When hardness is 48HRC, core transverse direction non-notch impact flexibility is 400J, tensile strength 1500MPa.
As shown in Fig. 2-4, the high tenacity high cracking resistance hot die steel and H13 steel grade that the embodiment of the present invention 1 produces are compared
It is found that the yield strength under the shock resistance of embodiment 1, yield strength, tensile strength and the condition of high temperature is than H13 steel grade
Height, therefore the toughness, harden ability and thermal crack resistant by sufficiently improving mould steel using Ni-Mo composite alloying can be achieved in the present invention
The performances such as property, guarantee tissue, hardness and the uniformity of die & mold treatment, make this hair in conjunction with purifying melting and multiway forging technology
Bright mold has superior comprehensive performance, and compared with existing H13 steel, the present invention has high tenacity and harden ability, good intensity
With the hot die steel of thermal crack resistance performance, uniform heat-treated sturcture and hardness, the mold of steel grade production of the present invention is in industry
Under the conditions of be processed into compression mod especially medium-and-large-sized compression mod when show service life more superior than H13, compared with H13 even it is normal
30-200% is improved with the service life of modified H13, there is more preferably elevated temperature strength and toughness to match, in cold cycling operating condition
The lower ability resisting crackle formation and extending is increased dramatically, and provides high tenacity high cracking resistance Forming Die for China's die industry
Have steel, promotes mold manufacture level and the market competitiveness.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (9)
1. a kind of high tenacity high cracking resistance hot die steel, it is characterised in that: its raw material includes: C 0.32- by weight
0.42 part, 0.1-0.5 parts of Si, 0.2-0.6 parts of Mn, 4.7-5.3 parts of Cr, 1.5-2.5 parts of Mo, 0.5-1.0 parts of V, Ni
0.6-1.8 parts, 0.01-0.02 parts of P, 0.0005-0.001 parts of S and Fe surplus.
2. a kind of high tenacity high cracking resistance hot die steel according to claim 1, it is characterised in that: its raw material includes such as
Lower component: 0.37 part of C, 0.3 part of Si, 0.4 part of Mn, 5 parts of Cr, 2 parts of Mo, 0.7 part of V, 1 part of Ni, 0.015 part of P, S
0.0007 part and Fe surplus.
3. a kind of high tenacity high cracking resistance hot die steel according to claim 1, it is characterised in that: its raw material includes such as
Lower component: 0.32 part of C, 0.1 part of Si, 0.2 part of Mn, 5.3 parts of Cr, 2.5 parts of Mo, 0.5 part of V, 0.6 part of Ni, P 0.01
Part, 0.0005 part of S and Fe surplus.
4. a kind of high tenacity high cracking resistance hot die steel according to claim 1, it is characterised in that: its raw material includes such as
Lower component: 0.42 part of C, 0.5 part of Si, 0.6 part of Mn, 4.7 parts of Cr, 1.5 parts of Mo, 1.0 parts of V, 1.5 parts of Ni, P 0.02
Part, 0.001 part of S and Fe surplus.
5. a kind of high tenacity high cracking resistance hot die steel according to any one of claims 1-4, it is characterised in that: its
Manufacturing method specifically includes the following steps:
S1, ingredient are smelted: the steel scrap prepared and ferroalloy raw material being carried out melting using smelting furnace, carry out pushing off the slag after melting
And the deoxidier that corresponding weight ratio part is added is tapped；
S2, ladle refining: adjusting alloying component by LF refining, and the deoxidier and refining slag progress of corresponding weight ratio part is added
Deoxidation and desulfurization, control S are less than or equal to 0.003%；
S3, vacuum outgas and casting: N, H, O elemental gas content in molten steel, vacuum degree tune are reduced using VD vacuum outgas equipment
Whole is within the scope of 50-67Pa, then molten steel is poured by degassing time 20-30min under the protection of argon gas using bet method
For the ingot shape of needs；
S4, atmosphere protected electro-slag re-melting: the ingot casting in step S3 is further purified by atmosphere protected electro-slag re-melting, is mentioned
The degree of purity of Gao Gang makes sulfur content be reduced to 0.0005-0.001%, meets degree of purity grade to high-duty cast hot die steel
Requirement, and improve steel ingot compactness and structural homogenity, slow cooling carried out to steel ingot after melting or is kept the temperature at 700-820 DEG C
It anneals；
S5, High temperature diffusion: steel ingot is subjected to High temperature diffusion at 1180-1280 DEG C, soaking time 15-20h is eliminated or solidified
Aliquation carbide, mitigation interdendritic element segregation in the process；
S6, multiway forging: carrying out multiway forging after steel ingot is kept the temperature, full and uniform tissue is crushed original coarse grain, forges laggard
Row is quickly cooled down；
S7, fine grain heat treatment technics: by the blank after forging in 1010-1130 DEG C of heat preservation 15-20h, then it is quickly cooled to 300-
500 DEG C, inhibit proeutectoid carbide along the precipitation of crystal boundary, and net carbide is avoided to generate；
S8, spheroidizing: shove charge is annealed after being cooled to relevant temperature, using isothermal spheroidizing, heating temperature 720-
Between 880 DEG C, the soaking time of isothermal section is no less than 15h, and 400 DEG C or less are slowly cooled to after isothermal and is come out of the stove.
6. a kind of manufacturing method of high tenacity high cracking resistance hot die steel according to claim 5, it is characterised in that: institute
Stating smelting furnace in step S1 is one of converter, electric furnace or induction furnace.
7. a kind of manufacturing method of high tenacity high cracking resistance hot die steel according to claim 5, it is characterised in that: institute
Stating the requirement that degree of purity grade need to meet in step S4 is NADCA#207-2008.
8. a kind of manufacturing method of high tenacity high cracking resistance hot die steel according to claim 5, it is characterised in that: institute
Stating initial forging temperature in step S6 is 1170-1220 DEG C, and total forging ratio need to be more than or equal to 6, and final forging temperature need to be more than or equal to 850 DEG C.
9. a kind of manufacturing method of high tenacity high cracking resistance hot die steel according to claim 5, it is characterised in that: institute
It states in step S8 when mould steel heat treatment hardness is 45-48HRC, core transverse direction non-notch impact flexibility is more than or equal to 350J,
Tensile strength is more than or equal to 1350MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910602981.XA CN110306108A (en) | 2019-07-05 | 2019-07-05 | A kind of high tenacity high cracking resistance hot die steel and its manufacturing method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109881097A (en) * | 2019-03-15 | 2019-06-14 | 四川丰元机械制造有限公司 | A kind of high-performance tool and mould band steel and its production technology |
| CN111041176A (en) * | 2019-12-30 | 2020-04-21 | 吕鹏昊 | Heat treatment process of hot work die steel |
| CN112011740A (en) * | 2020-08-31 | 2020-12-01 | 天津钢研海德科技有限公司 | High-toughness and high-hardness die steel and preparation method thereof |
| CN113621876A (en) * | 2021-06-02 | 2021-11-09 | 中航上大高温合金材料股份有限公司 | Manufacturing method of high-performance hot-work die steel |
| CN113862421A (en) * | 2021-09-23 | 2021-12-31 | 中国原子能科学研究院 | Manufacturing method of cake-shaped large-thickness forging |
| CN113930688A (en) * | 2021-10-18 | 2022-01-14 | 天津钢研海德科技有限公司 | High-nickel high-impact hot-work die steel and preparation method thereof |
| CN114318136A (en) * | 2021-06-02 | 2022-04-12 | 中航上大高温合金材料股份有限公司 | Manufacturing method of economical hot-work die steel |
| CN114540699A (en) * | 2022-02-28 | 2022-05-27 | 江苏宏晟模具钢材料科技有限公司 | High-performance hot-work die steel and preparation method thereof |
| CN114934230A (en) * | 2022-05-27 | 2022-08-23 | 天津钢研海德科技有限公司 | Hot work die steel with high tempering softening resistance and high toughness and manufacturing method thereof |
| CN116445821A (en) * | 2023-04-28 | 2023-07-18 | 鞍钢股份有限公司 | Die steel resistant to mechanical strain and high in uniformity and preparation method thereof |
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| CN109881097A (en) * | 2019-03-15 | 2019-06-14 | 四川丰元机械制造有限公司 | A kind of high-performance tool and mould band steel and its production technology |
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| CN113621876A (en) * | 2021-06-02 | 2021-11-09 | 中航上大高温合金材料股份有限公司 | Manufacturing method of high-performance hot-work die steel |
| CN114318136A (en) * | 2021-06-02 | 2022-04-12 | 中航上大高温合金材料股份有限公司 | Manufacturing method of economical hot-work die steel |
| CN113862421B (en) * | 2021-09-23 | 2024-02-20 | 中国原子能科学研究院 | Manufacturing method of cake-shaped large-thickness forging |
| CN113862421A (en) * | 2021-09-23 | 2021-12-31 | 中国原子能科学研究院 | Manufacturing method of cake-shaped large-thickness forging |
| CN113930688A (en) * | 2021-10-18 | 2022-01-14 | 天津钢研海德科技有限公司 | High-nickel high-impact hot-work die steel and preparation method thereof |
| CN114540699B (en) * | 2022-02-28 | 2022-12-13 | 江苏宏晟模具钢材料科技有限公司 | High-performance hot-work die steel and preparation method thereof |
| CN114540699A (en) * | 2022-02-28 | 2022-05-27 | 江苏宏晟模具钢材料科技有限公司 | High-performance hot-work die steel and preparation method thereof |
| CN114934230A (en) * | 2022-05-27 | 2022-08-23 | 天津钢研海德科技有限公司 | Hot work die steel with high tempering softening resistance and high toughness and manufacturing method thereof |
| CN116445821A (en) * | 2023-04-28 | 2023-07-18 | 鞍钢股份有限公司 | Die steel resistant to mechanical strain and high in uniformity and preparation method thereof |
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