CN110484812A - A kind of high-performance hot stamping die steel and its manufacturing process - Google Patents
A kind of high-performance hot stamping die steel and its manufacturing process Download PDFInfo
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- CN110484812A CN110484812A CN201910356418.9A CN201910356418A CN110484812A CN 110484812 A CN110484812 A CN 110484812A CN 201910356418 A CN201910356418 A CN 201910356418A CN 110484812 A CN110484812 A CN 110484812A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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- C—CHEMISTRY; METALLURGY
- 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
- C22C38/02—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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The present invention relates to a kind of high-performance hot stamping die steel and its manufacturing process, the constituent and its mass percent that the high-performance hot stamping die steel uses are as follows: C 0.66~0.80%, Si 0.80~1.20%, Mn 0.20~0.50%, Cr 5.00~6.50%, Mo 1.50~2.00%, V 0.40~0.80%, P < 0.015%, S < 0.015%, Fe surplus；The manufacturing process of inventive die steel is as follows: ingredient, smelting, pouring, then electroslag remelting；The heat treatment of high temperature expanding heat controls cooling after then multiway forging hot-working, and forging；Proeutectoid carbide refinement heat treatment and isothermal annealing processing are carried out again；Finally carry out quenching and tempering heat treatment.The present invention has the advantages that the harden ability of hot die steel of the present invention, thermal stability, wearability and thermal fatigue property are better than H13 steel, and it can be processed into the large-scale drop stamping mould that piece weight reaches 5 tons or more, the service performance having had.
Description
Technical field
The invention belongs to technical field of alloy steel, are related to a kind of hot stamping die steel, in particular to a kind of high-performance hot-working
Mould steel and its manufacturing process.
Background technique
Hot die steel is the die steel that (generally greater than 500 DEG C) use at relatively high temperatures, wherein playing high warm
The alloying element of epistasis and thermal stability is usually the alloying elements such as Cr, Mo, V, therefore current some research work are mainly
Adjustment to these alloying elements.The study find that the thermal fatigue resistance of steel can be improved in the addition of the Mo element of high level
Energy and anti-temper softening performance, and the addition of a certain amount of V element can greatly improve the thermal stability and thermal fatigue resistance of steel
Can, the use temperature of the steel is greatly improved, and higher C content, the intensity and wear-resisting property of steel, and steel can be significantly improved
Harden ability obtain larger raising, for manufacturing the hot stamping die steel of the large-scale high thermal fatigue resistance of high abrasion, use
Service life is greatly improved.
The hot die steel that China is widely used at present includes 4Cr5MoSiV1,3Cr2W8V and applied to hot-forging die
5CrNiMo, 5CrMnMo etc..The 3Cr2W8V of tungsten system although resistance to tempering with higher 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, be easy to cause working portion of die
It collapses；China's Extrusion Die Steel used at present is using grade of steel in standard GB/T/T1299-2000
4Cr5MoSiV1.The chemical component of this Extrusion Die Steel uses C 0.32-0.45wt%, Cr 4.75-5.50wt%, Mo
1.20-1.75wt%, V 0.80-1.20wt%, Si 0.80-1.2wt%, Mn 0.20-0.5wt%, P≤0.03wt%, S≤
0.03wt%.4Cr5MoSiV1 steel is present most popular hot die steel, but its elevated temperature strength be not it is very high, one
As using temperature no more than 540 DEG C, and thermal fatigue resistance and wear-resisting property be not high.The country discloses a kind of big section at present
Face pressure casting high performance hot-work die steel and its preparation process, the steel are characterized in that each major alloy member in alloy composition
The mass percent of element are as follows: C 0.35~0.65%, Si 0.30~1.00%, Mn 0.30~1.00%, Cr 3.50~
5.50%, Mo 2.00~3.00%, V 0.40~0.80%, P≤0.02%, S≤0.01%, Ni 1.00~2.00%, Nb
>=0.15%, Fe surplus.Since the chemical analysis of this die-casting die steel not only contains higher molybdenum, chromium and vanadium and certain
The carbon of amount, also containing 1.0% or more Ni element, it is ensured that the high-temperature behavior of steel, and its harden ability obtained it is biggish
It improves (compared with 4Cr5MoSiV1 steel).But the segregation of this material ESR ingot is serious, exists in the tissue after becoming a useful person a large amount of
Bulk Aliquation carbide is easy to appear early-age crack failure so that the toughness of material is insufficient.Since this material contains largely
Post-curing element, tempering state proeutectoid carbide is easy grow up under service condition roughening and occurrence type transformation, and returns
Alloying element in fiery martensite is also easy to be precipitated and reduce the intensity of steel, to reduce the high-temperature behavior of steel.In addition, this steel
Susceptibility of flake formation it is higher, be easy to appear micro-crack, be easy to appear in placement or use process underbead crack failure.It is heavier
Want be this material wear-resisting property it is not high, if be used as hot stamping die, die surface be easy to appear early stage peel off and plough
The wear-out defects such as ditch, and the service life of mold is caused not grown.
The metallurgical manufacturing process of above-mentioned hot die steel is to add electroslag remelting using electro-smelting, then forges the work become a useful person
Skill.In its manufacturing process, electro-smelting obtains the ESR ingot of 500Kg-3000Kg, warp after adding electroslag remelting process to complete
Forging machine forging is become a useful person.There are the following problems for this manufacturing process: 1) electroslag ingot shape is smaller, and small ingot shape reduces the lumber recovery of product
With manufacture production capacity；2) there are a large amount of bulky grain or big blocky Aliquation carbide and microstructure segregation, drops for the original structure of ESR ingot
Low steel ingot forging become a useful person after performance indicator；3) material grains are coarse after forging, and the impact flexibility of material is low after the tempering that causes to quench,
Product specification is low, be unable to satisfy market to big section, high tenacity, high heat-intensity hot-work die steel needs；4) expand hydrogen after forging to move back
The fiery time is long, and is easy to appear the detection defects such as Light spots crack.
For above-mentioned phenomenon, patent CN 109280849A discloses a kind of high performance hot-work die steel and its manufacturing process,
The constituent and its mass percent that the high performance hot-work die steel uses are as follows: C 0.20~0.30%, Si 0.40~
0.80%, Mn 0.40~0.80%, Cr 3.10~4.00%, Mo 1.60~2.00%, W 0.50~1.00%, V 0.10
~0.30%, P < 0.010%, S < 0.005%, Fe surplus；The manufacturing process of the invention mould steel is as follows: ingredient is smelted, is poured
Great waves, then electroslag remelting；The heat treatment of high temperature expanding heat controls cooling after then multiway forging hot-working, and forging；It carries out again secondary
Carbide refinement heat treatment and isothermal annealing processing；Finally carry out quenching and tempering heat treatment；The advantages of invention, is: the hair
Harden ability, thermal stability, impact flexibility and the thermal fatigue property of bright hot die steel are better than H13 steel, and can be processed into single-piece weight
Amount reaches 5 tons or more of large die-casting mould, the service performance having had；Furthermore it is possible to reduce ingot smelting cost and improve mold
Service life；But there are still certain defects for the patent of invention: carbon element content is lower in the invention steel grade, is unable to satisfy steel
Intensity and hardness requirement.
Therefore, the high-performance hot stamping die steel and its manufacturing process for researching and developing a kind of intensity that can be improved steel and hardness be
It is highly desirable.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-performance hot stamping die steel and its manufacturing process, to solve
Above-mentioned technical problem.
In order to solve the above technical problems, the technical solution of the present invention is as follows: a kind of high-performance hot stamping die steel, innovative point
Be: the constituent and its mass percent that the high-performance hot stamping die steel uses are as follows: C 0.66~0.80%, Si
0.80~1.20%, Mn 0.20~0.50%, Cr 5.00~6.50%, Mo 1.50~2.00%, V 0.40~0.80%, P
< 0.015%, S < 0.015%, Fe surplus.
Further, the constituent and its best in quality percentage that the high performance hot-work die steel uses are as follows: C
0.78%, Si 1.00%, Mn 0.40%, Cr 5.50%, Mo 1.60%, V 0.45%, P < 0.010%, S <
0.005%, Fe surplus.
A kind of manufacturing process of above-mentioned large die-casting mould high performance hot-work die steel, innovative point are: the system
Technique is made to include the following steps:
(1) smelt: the constituent and its mass percent used by high performance hot-work die steel carries out ingredient, arc melting
And refining, it then carries out electroslag remelting or vacuum consumable is smelted；
(2) High temperature diffusion is heat-treated: being heated to 1200~1280 DEG C, soaking time is 10~15h；
(3) it forges hot-working: being carried out being cooled in 1150~1250 DEG C of temperature ranges by the steel ingot of High temperature diffusion heat treatment
Multiway forging processing pulls out forging method using at least two upsettings two, forges compression ratio >=3, total forging ratio >=6, final forging temperature >=900
℃；
(4) cooling after forged: using control cooling after forging, guarantee that forging is quickly cooled down with the cooling rate not less than 15 DEG C/min, until temperature
Degree drops to 300 DEG C or less dress Annealing furnaces；
(5) proeutectoid carbide ultrafining heat-treatment: heating temperature is 950~1050 DEG C, and soaking time is 10~15h, is then adopted
Quickly it is cooled to 250 DEG C hereinafter, sending annealing furnace again with the mode of oil cooling or water cooling；
(6) isothermal spheroidizing is handled: first stage isothermal annealing temperature is 830~860 DEG C, and annealing time is 5~10h；The
Two-stage isothermal annealing temperature is 730~760 DEG C, and annealing time is 10~20h；
(7) quenching and tempering is heat-treated: being heated to 950~1030 DEG C, is cooled to 250 DEG C or less using the cold or water mist of oil；Then
550~650 DEG C of temperings are carried out, are tempered 2~3 times, every time tempering heat preservation 2~4 hours.
Further, in the High temperature diffusion heat treatment step, heating uses stepped heating mode.
The present invention has the advantages that large die-casting mould high performance hot-work die steel of the present invention, with general H13 Forming Die
Tool steel is compared:
(1) it improves a certain amount of carbon and is conducive to improve the intensity and hardness of steel, and improve the wear-resisting property of steel；
(2) suitable Mo element is added and is conducive to improve the people's stability and heat resistance of steel, while improving the thermal fatigue resistance of steel
Energy；
(3) Cr is carbide stabilizing element, can greatly improve the harden ability and wearability of steel, and the ruler for the mold for processing steel
It is very little to greatly improve；
(4) although manganese element is weak carbide formation element, can not form carbide reinforced effect, but a certain amount of manganese is first
Element additions can promote cementite decomposition and postponement carbide precipitation with grow up, be conducive to the thermal stability of steel；In addition,
Manganese element can cause the content of the retained austenite in steel to increase and stablize, and the toughness and thermal fatigue resistance of steel can be improved in this way
Performance；
(5) element silicon is not carbide former, but element silicon is the effective element for improving resistance to tempering, improves silicon member in steel
The content of element mainly can make steel decomposition of martensite during tempering slow down, and element silicon can be in austenite to horse
The decomposition of martensite is effectively hindered in drawing process after the transformation of family name's body, this, which mainly passes through, inhibits ε-carbide particle
It grows up and expands ε-carbide stable region, delay ε-carbide to the transformation of θ-carbide；Silicon postpones ε → θ transformation, and can fill
Divide and reduce growth rate of the cementite in drawing process in steel, silicon atom is precipitated from θ phase and forms silicon atom around θ phase
Enrichment region inhibits the roughening of growing up of θ phase；In addition silicon can effectively improve the anti-temper softening ability of steel；
(6) since the affinity of V and carbon is strong, VC primary carbide easy to form, this carbide particle during smelting
Size is larger, does not improve to the performance of steel not only, the opposite toughness for reducing steel and thermal fatigue property etc., and at subsequent heat
It is difficult to completely eliminate during reason.Therefore the ratio of suitable control VC primary carbide, improves the performance of steel；But it is being tempered
V can reduce the decomposition rate of martensite in the process, postpone the transformation of austenite, and V-arrangement is at the proeutectoid carbide of MC type, carefully
Small disperse, is not easy agglomeration, in drawing process, enhances age hardening effect, greatly improves the thermal stability of steel
And impact flexibility；Therefore, the content of V in steel is controlled between 0.40~0.80%, gives full play to the alloying action of V；
(7) high-performance hot stamping die steel of the present invention is after above-mentioned heat treatment, harden ability, thermal stability, wearability and
Thermal fatigue property is better than existing steel, and can be processed into the large-scale drop stamping mould that piece weight reaches 5 tons or more, the use having had
Performance.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the CCT curve of the present embodiment hot die steel.
Fig. 2 is tempering characteristics curve of the present embodiment hot die steel under 1010 DEG C of quenchings.
Fig. 3 is annealed structure figure of the present embodiment hot die steel after above-mentioned heat treatment process.
Fig. 4 is quenching structure figure of the present embodiment hot die steel after above-mentioned heat treatment process.
Fig. 5 is tempered structure figure of the present embodiment hot die steel after above-mentioned heat treatment process.
Fig. 6 is that the present embodiment hot die steel compares at 650 DEG C with H13 steel thermal stability data.
Fig. 7 is the present embodiment hot die steel heat fatigue cracking surface topography map.
Specific embodiment
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this
It is bright to be limited among the embodiment described range.
Embodiment
The constituent and its mass percent of the present embodiment large die-casting mould high performance hot-work die steel are as follows: C
0.78%, Si 1.00%, Mn 0.40%, Cr 5.50%, Mo 1.60%, V 0.45%, P 0.010%, S 0.005%,
Fe surplus.
The technical process of high-performance hot stamping die steel is produced using the material in the embodiment and steps are as follows:
(1) electric furnace smelting: by high-performance hot stamping die steel use constituent and its mass percent in electric arc furnaces into
Row melting, smelting temperature are greater than 1500 DEG C, are cast into φ 400mm- φ 450mm electrode bar and air-cooled；
(2) electroslag remelting: the steel ingot after pouring is placed in electroslag remelting device as consutrode, carries out electroslag remelting,
Slugging voltage 56-62V, electric current 3000-5000A, electric system voltage 57-59V, electric current 11000-12000A, bind voltage 57-
59V, current time 35-50Min, electroslag remelting is at 1000Kg-15000Kg ESR ingot；
(3) High temperature diffusion be heat-treated: the steel ingot after electroslag remelting is classified to heating in forge furnace, i.e., respectively 600 DEG C,
800 DEG C, 1100 DEG C of isothermals, finally heated to be warming up to 1200~1280 DEG C, soaking time is 10~15h, and uniform formation improves and closes
Golden component segregation and elimination Aliquation carbide；In this step, in order to reduce since temperature is too low so that High temperature diffusion is heat-treated
Unevenly, and the time is too short so that coring is insufficient, it is advantageous to High temperature diffusion heat treatment temperature be 1230~1250
DEG C, soaking time 15h；
(4) it forges hot-working: being carried out being cooled in 1150~1250 DEG C of temperature ranges by the steel ingot of High temperature diffusion heat treatment
Multiway forging processing pulls out forging method using two upsettings two, forges compression ratio >=3, total forging ratio >=6, final forging temperature >=900 DEG C；
(5) cold using water cooling or mist after forging, guarantee that cooling rate of the forging not less than 15 DEG C/min is quickly cooled down, until temperature drops to 200
DEG C or less dress Annealing furnace；
(6) proeutectoid carbide ultrafining heat-treatment: heating temperature is 950~1050 DEG C, and soaking time is 10~15h, is then adopted
Quickly it is cooled to 250 DEG C hereinafter, sending annealing furnace again with the mode of oil cooling or water cooling；In order to make refinement more sufficiently completely, in this step
Preferably 1010 DEG C of heating temperature, soaking time 10h；
(7) isothermal spheroidizing is handled: first stage isothermal annealing temperature is 830~860 DEG C, and annealing time is 5~10h；The
Two-stage isothermal annealing temperature is 730~760 DEG C, and annealing time is 10~20h；In order to reduce energy consumption, first rank of this step
The annealing time of section is 6h, and the annealing time of second stage is 10h；
(8) quenching and tempering is heat-treated: being heated to 950~1030 DEG C, is cooled to 250 DEG C or less using the cold or water mist of oil；Then
550~650 DEG C of temperings are carried out, are tempered 2~3 times, every time tempering heat preservation 2~4 hours；It can be protected to reduce energy consumption simultaneously
Quenching and tempering effect is demonstrate,proved, hardening heat selects 1010 DEG C in this step, and using oil quenching, tempering temperature is 580 DEG C, tempering two
Secondary, each time is 2h.
After above-mentioned smelting and hot-working and heat treatment, final finished specification is the present embodiment hot die steel
500mm*800mm*3000mm module, sampling are tested for the property:
A transformation temperature:
The CCT curve of the present embodiment large die-casting mould high performance hot-work die steel is as shown in Fig. 1, and Ac1, Ac3 and Ms point are surveyed
Test result is respectively 810 DEG C, 870 DEG C and 280 DEG C.
B tempering characteristics:
It is as shown in Fig. 2 in the characteristic curve that 1010 DEG C of quenched tempering hardnesses change with tempering temperature.
C hardness test:
Quenching hardness: 62HRC；Tempering hardness: 52HRC.
D annealed structure:
The annealed structure of steel of the present invention is as shown in Fig. 3.
E quenching structure:
The quenching structure of steel of the present invention is as shown in Fig. 4.
F tempered structure:
Steel belt roof bolt tissue of the present invention is as shown in Fig. 5.
The experiment of G impact flexibility:
Lateral impact sample is taken on blank, specimen size is 7mm × 10mm × 55mm (using North America die casting association criterion).
Room temperature impact work value: >=260J.
H thermal stability:
The present embodiment hot die steel carries out stability contrast experiment with H13 steel under the conditions of 650 DEG C, and H13 steel is by tempering of quenching
Make its hardness number as steel of the present invention after processing, is 50HRC, test result is as shown in Fig. 6.Though by attached drawing 6 as it can be seen that
Hot die steel of the present invention is consistent with H13 steel hardness number before so experiment starts, but at 650 DEG C, and from carrying out, 20 hour heat are steady
From the point of view of qualitative experiment firmness change situation, the hot die steel of the present embodiment is better than H13 steel.
I hot fatigue performance test:
Cold cycling is carried out under the conditions of -700 DEG C of room temperature, after 3000 cold cyclings, compares hot die steel of the present invention
With the heat fatigue surface topography and section hardness gradient (as shown in Fig. 7) of H13 steel.It can be seen that the present embodiment Forming Die
After having steel thermal fatigue test, face crack is visibly homogeneous, tiny, does not see the formation of bigger lead crack on the surface.
And the face crack of H13 steel reticulates, and wherein there is the biggish lead crack of several width, is mutually communicated between crackle, is in
Crack shape.In addition, can be seen that the hardness of H13 steel declines significantly in embodiment hot die steel from section hardness gradient distribution.
The two comparison is as can be seen that the thermal fatigue property of the present embodiment hot die steel is better than H13 steel.
Basic principles and main features and advantages of the present invention of the invention have been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (4)
1. a kind of high-performance hot stamping die steel, it is characterised in that: the constituent that the high-performance hot stamping die steel uses
And its mass percent is as follows: C 0.66~0.80%, Si 0.80~1.20%, Mn 0.20~0.50%, Cr 5.00~
6.50%, Mo 1.50~2.00%, V 0.40~0.80%, P < 0.015%, S < 0.015%, Fe surplus.
2. high-performance hot stamping die steel according to claim 1, it is characterised in that: the high-performance hot stamping die steel
The constituent and its best in quality percentage of use are as follows: C 0.78%, Si 1.00%, Mn 0.40%, Cr 5.50%, Mo
1.60%, V 0.45%, P < 0.010%, S < 0.005%, Fe surplus.
3. a kind of manufacturing process of high-performance hot stamping die steel described in claim 1, it is characterised in that: the manufacturing process
Include the following steps:
(1) smelt: it is molten that the constituent and its mass percent used by high-performance hot stamping die steel carries out ingredient, electric arc furnaces
Refining and refining, then carry out electroslag remelting or vacuum consumable is smelted；
(2) High temperature diffusion is heat-treated: being heated to 1200~1280 DEG C, soaking time is 10~15h；
(3) it forges hot-working: being carried out being cooled in 1150~1250 DEG C of temperature ranges by the steel ingot of High temperature diffusion heat treatment
Multiway forging processing pulls out forging method using at least two upsettings two, forges compression ratio >=3, total forging ratio >=6, final forging temperature >=900
℃；
(4) cooling after forged: using control cooling after forging, guarantee that forging is quickly cooled down with the cooling rate not less than 15 DEG C/min, until temperature
Degree drops to 300 DEG C or less dress Annealing furnaces；
(5) proeutectoid carbide ultrafining heat-treatment: heating temperature is 950~1050 DEG C, and soaking time is 10~15h, is then adopted
Quickly it is cooled to 250 DEG C hereinafter, sending annealing furnace again with the mode of oil cooling or water cooling；
(6) isothermal spheroidizing is handled: first stage isothermal annealing temperature is 830~860 DEG C, and annealing time is 5~10h；The
Two-stage isothermal annealing temperature is 730~760 DEG C, and annealing time is 10~20h；
(7) quenching and tempering is heat-treated: being heated to 950~1030 DEG C, is cooled to 250 DEG C or less using the cold or water mist of oil；Then
550~650 DEG C of temperings are carried out, are tempered 2~3 times, every time tempering heat preservation 2~4 hours.
4. the manufacturing process of high-performance hot stamping die steel according to claim 3, it is characterised in that: the High temperature diffusion
In heat treatment step, heating uses stepped heating mode.
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| CN110656294A (en) * | 2019-10-31 | 2020-01-07 | 宝钢轧辊科技有限责任公司 | Working roll special for tin-plating finisher and manufacturing method thereof |
| CN111455149A (en) * | 2020-05-11 | 2020-07-28 | 山东邦巨实业有限公司 | Isothermal spheroidizing annealing process for H13 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 |
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| CN117051330A (en) * | 2023-08-04 | 2023-11-14 | 威海天润新材料科技有限公司 | Steel for tunnel excavator hob ring for extremely hard rock and preparation method thereof |
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