CN107488813A - The preparation method of high tenacity, high tropism ZW868 hot die steels - Google Patents

The preparation method of high tenacity, high tropism ZW868 hot die steels Download PDF

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CN107488813A
CN107488813A CN201710709570.1A CN201710709570A CN107488813A CN 107488813 A CN107488813 A CN 107488813A CN 201710709570 A CN201710709570 A CN 201710709570A CN 107488813 A CN107488813 A CN 107488813A
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temperature
preparation
argon gas
slag
cooled
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CN107488813B (en
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刘道献
曹立军
赵显峰
赵伟东
冯明明
姚宏康
张健
张长春
王建华
崔瑞婷
蒋大鹏
张海英
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Tangshan Zhiwei Yulong Roll Technology Co.,Ltd.
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TANGSHAN ZWELL TECHNOLOGY Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • 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
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The present invention relates to a kind of high tenacity, the preparation technology of high tropism ZW868 hot die steels, preparation technology includes electric furnace smelting, LF+VD refinings, casting, annealing, electroslag remelting, forging, the steps such as ultra fine, spheroidizing, content is calculated as mould steel by mass percentage：C is 0.35 0.40%, and Si≤0.25%, Mn are 0.30 0.50%, and Cr is 5.00 5.30%, Mo is 2.20 2.40%, and V is 0.50 0.65%, P≤0.010%, S≤0.001%, Ni≤0.20%, Cu≤0.10%, Nb are 0.005 0.020%, and surplus is Fe and inevitable impurity.Pass through the change of the improvement binding component content to preparation technology so that degree of purity, toughness and the equal orientation performance of steel, which reach, to be significantly improved.

Description

The preparation method of high tenacity, high tropism ZW868 hot die steels
Technical field
The invention belongs to steel smelting field, and in particular to the preparation of a kind of high tenacity, high tropism ZW868 hot die steels Technique.
Background technology
In recent years, further to improve the performance of H13 type hot die steels, to adapt to increasingly harsh service condition, need Optimizing components are carried out on the basis of H13 steel.The present invention using reduction Si, V content and improves Mo elements based on H13 steel Micro Nb is added to steel grade carry out alloying element design while content.It is preferable that high-temperature stability has been postponed in the increase of Mo contents M23C6 type Carbides Transformation of the MC types carbide to less stable.Nb addition can improve its heat endurance, improve heat fatigue Drag.The ratio between existing more advanced technical merit, horizontal, longitudinal non-notch ballistic work (etc. tropism) is at best able to reach 0.88.
The content of the invention
The present invention proposes a kind of high tenacity, the preparation technology of high tropism ZW868 hot die steels.It is of the present invention " ZW868 " is the trade mark title of the mould steel.
Realized especially by following technological means：
The preparation method of a kind of high tenacity, high tropism hot die steel, the preparation method comprise the following steps：
(1) electric furnace smelting, the dispensing of the pig iron and alloy material is carried out according to the constituent content of hot die steel, is melted in electric furnace Change and smelt, aoxidize and skim when temperature is 1630~1650 DEG C, Antaciron, lime, fluorite are added after skimming, tapping temperature is 1650~1660 DEG C, in tapping process plus aluminium carries out deoxidation.
(2) LF stoves refine, and connect argon gas after entering LF stoves, then feeding temperature-raising, add lime and fluorite adjustment clinker flowing Property, using SiC powder and aluminum shot diffusive deoxidation, the heating and thermal insulation time is 10~20min, slag in vain after sampling analysis, white slag keep when Between be 30~50min, trimming is carried out according to analysis result after sampling analysis, LF stoves tapping temperature is 1680~1690 ℃。
(3) VD is refined, final vacuum ＜ 67Pa, is kept 18~35min of the final vacuum, is sampled and divide after vacuum breaker Analysis, the qualified rear soft blow of composition enter argon gas to bull ladle, and the time of soft blow argon gas is 18~39min, and bull ladle temperature is 1550~1568 ℃。
(4) casting electrode base, preheating ingot mould is 80~200 DEG C, is then filled with argon gas to ingot mould, during each wharve applying argon gas Between be 3~5min, then withdraw from tunger tube, cast after ingot mould is covered with lid, casting overall process is using carrying additionally asbestos The argon gas protective casting part of cloth is protected, and argon gas protection flow is 15~26m3/ h, casting time are 4~8min, electrode billet It is stripped after a diameter of 560~610mm, 3~5h.
(5) anneal, 710~760 DEG C, 1~1.5min/mm of soaking time of annealing temperature, be furnace-cooled to 300~350 DEG C and come out of the stove.
(6) electroslag remelting, the electrode billet obtained using step (4), removing surface polishing, using calcirm-fluoride and aluminum oxide two First slag system is smelted, and the molten speed value of the starting point of electroslag smelting steady-state process be 7~10kg/min, and the molten speed value of terminal is 5.0~ 8.0kg/min, ESR ingot is obtained, then send forging process after the cold 80~100min of power failure stove.
(7) forge, the ESR ingot that step (6) obtains is heated to 1240~1260 DEG C, 15~25h of insulation is diffused Matter, then through upset pulling hammer cogging, 1240~1260 DEG C are then again heated to, 15~25h of insulation is diffused Matter, then carry out again tri- directions of X, Y and Z it is upset after pull out again to finished size.
(8) ultra fine, the workpiece that step (7) obtains is inserted in heating furnace and is warming up to 1010~1040 DEG C with stove, After being incubated 5~10h, cooled down using the gap type of cooling of sky-water-sky-water, be specially：Come out of the stove be air-cooled to surface 840~ At 860 DEG C, quickly it is put into 25~30 DEG C of water and is cooled down, after water cooling to 860 DEG C~890 DEG C of central temperature, air cooling 2~ 5min, then reenter after being water-cooled to 700 DEG C~730 DEG C of central temperature, 2~5min of air cooling, enter back into and center portion is cooled in water 540 DEG C~560 DEG C or so of temperature, then workpiece is cooled down into 0.5h~2h in atmosphere so that workpiece surface highest returns warm temperature and is 300~330 DEG C, treat that surface temperature carries out spheroidizing for 250 DEG C of -300 DEG C or so fed to boiler.
(9) spheroidizing, the workpiece that step (8) obtains is inserted in annealing furnace, is heated to 830~860 DEG C, insulation 25~ 45h, carry out spheroidizing.
Content is calculated as the hot die steel of the present invention by mass percentage：C is 0.35-0.40%, Si≤0.25%, Mn is 0.30-0.50%, Cr 5.00-530%, Mo 2.20-2.40%, V 0.50-0.65%, P≤0.010%, S≤ 0.001%, Ni≤0.20%, Cu≤0.10%, Nb 0.005-0.020%, surplus are Fe and inevitable impurity.
Preferably, the preparation method also comprises the following steps after step (9)：
(10) cut horizontal, longitudinal non-notch impact specimen along the centre in section on blank, specimen size be 7mm × 10mm × 55mm, sample, to 1020~1040 DEG C, are incubated 30min oil quenchings to room temperature with stove heat.
(11) it is tempered, the impact specimen obtained after step (10) is quenched is inserted in tempering furnace, is heated to 600~630 DEG C, Soaking time 120min, is then air-cooled to room temperature.
(12) tempering step of repeat step (11) 2~3 times so that impact specimen hardness is carried out after reaching 44~46HRC Ballistic work performance detection.
Preferably, a diameter of 750mm of Electrode ESR ingot, 5.7~6t of weight.
Preferably, CaF in the binary slag system of step (6)2∶Al2O3For (67.5~72.5): (27.5~32.5).
Preferably, the quantity of slag in step (6) is 160~190kg.
Preferably, toasted 6~8 hours at 600~650 DEG C before slag charge uses in step (6).
Preferably, the addition of Antaciron described in step (1) is 1.8~2.5kg/t, the addition of the lime For 400kg/t, the addition of the fluorite is 100kg/t.
Preferably, the amount for adding aluminium in the tapping process of step (1) is 1.8~2.5kg/t.
Effect of the invention is that：
1, cleaned using electric furnace steel making, LF external refinings, VD vacuum deaerations, argon gas protective casting, electroslag secondary remelting, and And the design parameter of each step is specifically controlled (setting of such as tapping temperature, the setting of bull ladle temperature, white slag retention time, to blow Argon time etc.) so that oxygen content as little as 12ppm is obtained, thick system, is carefully the high-cleanness steel ingot that field trash sum distinguishes≤1 grade.
2, by setting steel ingot, through the diffusion that homogenizes, one pier one pulls out hammer cogging, carries out second homogenate diffusion, then carry out Three-dimensional forging, is dissolved hardening and spheroidizing processing, and the design parameter of each step of reasonable set and each step it Between parameter effective collocation, effectively improve the uniformity of steel, improve anisotropy, the banding rank of the steel reaches SA1, nodularization group Knit and reach within AS6.
3, by reasonable set quenching and tempering step and design parameter, and final temper hardness of quenching is set, made Obtain workpiece and reach 44~46HRC through temper hardness of quenching, single non-notch side knock work(>=380J, average non-notch are horizontal Impact property >=400J；The ratio between horizontal, longitudinal non-notch ballistic work (etc. tropism) >=0.96.
Brief description of the drawings
Fig. 1 is the flow chart of preparation method of the present invention.
Embodiment
Embodiment 1
High tenacity, high tropism hot die steel preparation method, content is calculated as the hot die steel by mass percentage： C is 0.36%, Si：0.15%, Mn 0.32%, Cr 5.12%, Mo 2.25%, V 0.52%, P：0.0050%, S： 0.0001%, Ni：0.10%, Cu：0.05%, Nb 0.008%, surplus are Fe and inevitable impurity；
Comprise the following steps：
(1) electric furnace smelting, the dispensing of the pig iron and alloy material is carried out according to claim 2 constituent content, is melted in electric furnace To smelt, aoxidize and skim when temperature is 1635 DEG C, Antaciron, lime, fluorite are added after skimming, tapping temperature is 1652 DEG C, In tapping process plus aluminium carries out deoxidation；
(2) LF stoves refine, and connect argon gas after entering LF stoves, then feeding temperature-raising, add lime and fluorite adjustment clinker flowing Property, using SiC powder and aluminum shot diffusive deoxidation, the heating and thermal insulation time is 12min, and rear sampling analysis, white slag retention time are slag in vain 35min, carries out trimming after sampling analysis according to analysis result, and LF stoves tapping temperature is 1682 DEG C；
(3) VD is refined, and final vacuum ＜ 65Pa keep final vacuum 21min, sampling analysis after vacuum breaker, into Soft blow enters argon gas to bull ladle after division lattice, and the time of soft blow argon gas is 19min, and bull ladle temperature is 1556 DEG C；
(4) casting electrode base, preheating ingot mould is 98 DEG C, argon gas is then filled with to ingot mould, each wharve applying argon gas time is 3.5min, tunger tube is then withdrawn from, cast after ingot mould is covered with lid, casting overall process is using the argon for carrying additionally asbestos cloth Gas shielded cast is protected, and argon gas protection flow is 18m3It is stripped after/h, casting time 5min, 3.5h；
(5) anneal, 740 DEG C of annealing temperature, soaking time 1.5min/mm (minute is per mm of thickness), be furnace-cooled to 300 DEG C and go out Stove；
(6) electroslag remelting, the electrode billet obtained using step (4), removing surface polishing, using calcirm-fluoride and aluminum oxide two First slag system is smelted, and the molten speed value of starting point of electroslag smelting steady-state process is 8kg/min, and the molten speed value of terminal is 6.5kg/min, is obtained To φ 750mm ESR ingots, then forging process is sent after the cold 91min of power failure stove；
(7) forge, the ESR ingot that step (6) obtains is heated to 1248 DEG C, insulation 15h, which is diffused, to homogenize, then Hammer cogging after pier once pulls out once, 1249 DEG C are then again heated to, insulation 15h, which is diffused, to homogenize, and then carries out again X, tri- directions of Y and Z it is upset after pull out again, it is 300mm to obtain thickness, and width is 710mm module；
(8) ultra fine, the workpiece that step (7) obtains is inserted in heating furnace and is warming up to 1025 DEG C with stove, be incubated 6h Afterwards, cooled down using water cooling and the alternate type of cooling of air cooling, come out of the stove when being air-cooled to 850 DEG C of surface, be quickly put into 28 DEG C Cooled down in water, water cooling to 840 DEG C of central temperature, carry out air cooling 3min, entered back into water to 550 DEG C or so of center portion temperature, Workpiece is cooled down into 1.5h in atmosphere again, workpiece surface highest returns temperature as 310 DEG C, treats that 280 DEG C or so of surface temperature enters stove Carry out spheroidizing.
(9) spheroidizing, the workpiece that step (8) obtains is inserted in annealing furnace, is heated to 850 DEG C of progress cycle nodularizations and moves back Fire, it is incubated 28h；
(10) cut horizontal, longitudinal non-notch impact specimen along the centre in section on blank, specimen size be 7mm × 10mm × 55mm, sample, to 1030 DEG C, are incubated 30min oil quenchings to room temperature with stove heat.
(11) it is tempered, the impact specimen obtained after step (10) is quenched is inserted in tempering furnace, is heated to 610 DEG C, insulation Time 120min, is then air-cooled to room temperature.
(12) tempering step of repeat step (11) 2 times so that impact specimen hardness is impacted after reaching 44~46HRC Work(performance detection.
The a diameter of 750mm of Electrode ESR ingot, weight 6t.
CaF in the binary slag system of step (6)2∶Al2O3For 70: 30.
The quantity of slag in step (6) is 168kg.
Slag charge toasts 6.5 hours to before using at 625 DEG C in step (6).
The addition of Antaciron described in step (1) is 2.0kg/t, and the addition of the lime is 400kg/t, described The addition of fluorite is 100kg/t.
The amount for adding aluminium in step (1) in tapping process is 1.9kg/t.
Embodiment 2
High tenacity, high tropism hot die steel preparation method, content is calculated as the hot die steel by mass percentage： C is 0.38%, Si：0.05%, Mn 0.39%, Cr 5.2%, Mo 2.30%, V 0.62%, P：0.0080%, S： 0.0006%, Ni：0.10%, Cu：0.05%, Nb 0.009%, surplus are Fe and inevitable impurity.
Comprise the following steps：
(1) electric furnace smelting, the dispensing of the pig iron and alloy material is carried out according to claim 2 constituent content, is melted in electric furnace To smelt, aoxidize and skim when temperature is 1642 DEG C, Antaciron, lime, fluorite are added after skimming, tapping temperature is 1654 DEG C, In tapping process plus aluminium carries out deoxidation；
(2) LF stoves refine, and connect argon gas after entering LF stoves, then feeding temperature-raising, add lime and fluorite adjustment clinker flowing Property, using SiC powder and aluminum shot diffusive deoxidation, the heating and thermal insulation time is 14min, and rear sampling analysis, white slag retention time are slag in vain 45min, carries out trimming after sampling analysis according to analysis result, and LF stoves tapping temperature is 1685 DEG C；
(3) VD is refined, and final vacuum ＜ 65Pa keep final vacuum 23min, sampling analysis after vacuum breaker, into Soft blow enters argon gas to bull ladle after division lattice, and the time of soft blow argon gas is 23min, and bull ladle temperature is 1554 DEG C；
(4) casting electrode base, preheating ingot mould is 102 DEG C, argon gas is then filled with to ingot mould, each wharve applying argon gas time is 4.5min, tunger tube is then withdrawn from, cast after ingot mould is covered with lid, casting overall process is using the argon for carrying additionally asbestos cloth Gas shielded cast is protected, and argon gas protection flow is 19m3It is stripped after/h, casting time 5min, 3.5h；
(5) anneal, 740 DEG C, soaking time 1.5min/mm of annealing temperature, be furnace-cooled to 300 DEG C and come out of the stove；
(6) electroslag remelting, the electrode billet obtained using step (4), removing surface polishing, using calcirm-fluoride and aluminum oxide two First slag system is smelted, and the molten speed value of starting point of electroslag smelting steady-state process is 8kg/min, and the molten speed value of terminal is 6.5kg/min, is obtained To φ 750mm ESR ingots, then forging process is sent after the cold 100min of power failure stove；
(7) forge, the ESR ingot that step (6) obtains is heated to 1255 DEG C, insulation 20h, which is diffused, to homogenize, then Hammer cogging after pier once pulls out once, 1255 DEG C are then again heated to, insulation 20h, which is diffused, to homogenize, and then carries out again X, tri- directions of Y and Z it is upset after pull out again, it is 400mm to obtain thickness, and width is 710mm module；
(8) ultra fine, the workpiece that step (7) obtains is inserted in heating furnace and is warming up to 1030 DEG C with stove, be incubated 8h Afterwards, cooled down using water cooling and the alternate type of cooling of air cooling, come out of the stove when being air-cooled to 855 DEG C or so of surface, be quickly put into 26 DEG C or so water in cooled down, water cooling to 880 DEG C of central temperature, carry out air cooling 3min or so, water cooling to central temperature 735 DEG C, air cooling 3min or so is carried out, is entered back into 555 DEG C or so of center portion temperature in water, then workpiece is cooled down into 1.5h, work in atmosphere Part surface highest returns temperature as 325 DEG C, treats that 260 DEG C or so of surface temperature enters stove and carries out annealing process.
(9) spheroidizing, the workpiece that step (8) obtains is inserted in annealing furnace, is heated to 850 DEG C of progress cycle nodularizations and moves back Fire, it is incubated 36h；
(10) cut horizontal, longitudinal non-notch impact specimen along the centre in section on blank, specimen size be 7mm × 10mm × 55mm, sample, to 1030 DEG C, are incubated 30min oil quenchings to room temperature with stove heat.
(11) it is tempered, the impact specimen obtained after step (10) is quenched is inserted in tempering furnace, is heated to 610 DEG C, insulation Time 120min, is then air-cooled to room temperature.
(12) tempering step of repeat step (11) 2 times so that impact specimen hardness is impacted after reaching 44~46HRC Work(performance detection.
The a diameter of 750mm of Electrode ESR ingot, electrode billet weight 5.8t.
CaF in the binary slag system of step (5)2∶Al2O3For 70: 30.
The quantity of slag in step (5) is 168kg.
Slag charge toasts 6.5 hours to before using at 625 DEG C in step (5).
The addition of Antaciron described in step (1) is 2.0kg/t, and the addition of the lime is 400kg/t, described The addition of fluorite is 100kg/t.
The amount for adding aluminium in step (1) in tapping process is 1.9kg/t.
Embodiment 3
High tenacity, high tropism hot die steel preparation method, content is calculated as the hot die steel by mass percentage： C is 0.39%, Si：0.20%, Mn 0.32%, Cr 5.10%, Mo 2.25%, V 0.56%, P：0.0010%, S： 0.0005%, Ni：0.11%, Cu：0.03%, Nb 0.007%, surplus are Fe and inevitable impurity.
Comprise the following steps：
(1) electric furnace smelting, the dispensing of the pig iron and alloy material is carried out according to the constituent content of claim 2, is melted in electric furnace Change and smelt, aoxidize and skim when temperature is 1632 DEG C, Antaciron, lime, fluorite, tapping temperature 1655 are added after skimming DEG C, in tapping process plus aluminium carries out deoxidation；
(2) LF stoves refine, and connect argon gas after entering LF stoves, then feeding temperature-raising, add lime and fluorite adjustment clinker flowing Property, using SiC powder and aluminum shot diffusive deoxidation, the heating and thermal insulation time is 15min, and rear sampling analysis, white slag retention time are slag in vain 40min, carries out trimming after sampling analysis according to analysis result, and LF stoves tapping temperature is 1682 DEG C；
(3) VD is refined, and final vacuum ＜ 65Pa keep final vacuum 25min, sampling analysis after vacuum breaker, into Soft blow enters argon gas to bull ladle after division lattice, and the time of soft blow argon gas is 23min, and bull ladle temperature is 1552 DEG C；
(4) casting electrode base, preheating ingot mould is 98 DEG C, argon gas is then filled with to ingot mould, each wharve applying argon gas time is 4.5min, tunger tube is then withdrawn from, cast after ingot mould is covered with lid, casting overall process is using the argon for carrying additionally asbestos cloth Gas shielded cast is protected, and argon gas protection flow is 17m3It is stripped after/h, casting time 5min, 3.5h；
(5) anneal, 740 DEG C, soaking time 1.5min/mm of annealing temperature, be furnace-cooled to 300 DEG C and come out of the stove；
(6) electroslag remelting, the electrode billet obtained using step (4), removing surface polishing, using calcirm-fluoride and aluminum oxide two First slag system is smelted, and the molten speed value of starting point of electroslag smelting steady-state process is 8kg/min, and the molten speed value of terminal is 6.5kg/min, is obtained ArriveESR ingot, then send forging process after the cold 110min of power failure stove；
(7) forge, the ESR ingot that step (6) obtains is heated to 1248 DEG C, insulation 21h, which is diffused, to homogenize, then Hammer cogging after pier once pulls out once, 1249 DEG C are then again heated to, insulation 21h, which is diffused, to homogenize, and then carries out again X, tri- directions of Y and Z it is upset after pull out again, it is 500mm to obtain thickness, and width is 710mm module；
(8) ultra fine, the workpiece that step (7) obtains is inserted in heating furnace and is warming up to 1030 DEG C with stove, be incubated 11h Afterwards, cooled down using water cooling and the alternate type of cooling of air cooling, come out of the stove when being air-cooled to 851 DEG C or so of surface, be quickly put into 27 DEG C water in cooled down, water cooling to 878 DEG C or so of central temperature, carry out air cooling 4min, enter back into water to center portion temperature 722 DEG C or so, air cooling 3min or so is carried out, is entered back into 560 DEG C or so of center portion temperature in water, then workpiece is cooled down into 2h in atmosphere, Workpiece surface highest returns temperature as 320 DEG C, treats that 266 DEG C or so of surface temperature enters stove and carries out annealing process.
(9) spheroidizing, the workpiece that step (8) obtains is inserted in annealing furnace, is heated to 850 DEG C of progress cycle nodularizations and moves back Fire, it is incubated 41h；
(10) cut horizontal, longitudinal non-notch impact specimen along the centre in section on blank, specimen size be 7mm × 10mm × 55mm, sample, to 1030 DEG C, are incubated 30min oil quenchings to room temperature with stove heat.
(11) it is tempered, the impact specimen obtained after step (10) is quenched is inserted in tempering furnace, is heated to 610 DEG C, insulation Time 120min, is then air-cooled to room temperature.
(12) tempering step of repeat step (11) 2 times so that impact specimen hardness is impacted after reaching 44~46HRC Work(performance detection.
The a diameter of 750mm of Electrode ESR ingot, weight 5.9t.
CaF in the binary slag system of step (5)2∶Al2O3For 70: 30.
The quantity of slag in step (5) is 168kg.
Slag charge toasts 6.5 hours to before using at 625 DEG C in step (5).
The addition of Antaciron described in step (1) is 2.0kg/t, and the addition of the lime is 400kg/t, described The addition of fluorite is 100kg/t.
The amount for adding aluminium in step (1) in tapping process is 1.9kg/t.
The high power and mechanics properties testing of embodiment the results are shown in Table 1 and table 2：
The ZW868 micro test results of table 1
A classes are sulfide-based field trash in table 1, and B classes are alumina type field trash, and C classes are Silicate inclusion thing, D classes It is concept generally in the art for spherical oxide type impurity.
The ZW868 mechanical property results of table 2

Claims (9)

1. the preparation method of a kind of high tenacity, high tropism hot die steel, it is characterised in that the preparation method includes as follows Step：
(1) electric furnace smelting, the dispensing of the pig iron and alloy material is carried out according to the constituent content of hot die steel, smelting is melted in electric furnace Refining, temperature be 1630~1650 DEG C when oxidation skim, after skimming add Antaciron, lime, fluorite, tapping temperature be 1650~ 1660 DEG C, in tapping process plus aluminium carries out deoxidation；
(2) LF stoves refine, and connect argon gas after entering LF stoves, then feeding temperature-raising, add lime and fluorite adjustment slag fluidity, adopt With SiC powder and aluminum shot diffusive deoxidation, the heating and thermal insulation time is 10~20min, and rear sampling analysis, white slag retention time are 30 to slag in vain ~50min, carries out trimming after sampling analysis according to analysis result, and LF stoves tapping temperature is 1680~1690 DEG C；
(3) VD is refined, and final vacuum ＜ 67Pa keep 18~35min of the final vacuum, sampling analysis after vacuum breaker, into Soft blow enters argon gas to bull ladle after division lattice, and the time of soft blow argon gas is 18~39min, and bull ladle temperature is 1550~1568 DEG C；
(4) casting electrode base, preheating ingot mould is 80~200 DEG C, argon gas is then filled with to ingot mould, each wharve applying argon gas time is 3~5min, tunger tube is then withdrawn from, cast after ingot mould is covered with lid, casting overall process, which uses, carrys additionally asbestos cloth Argon gas protective casting part is protected, and argon gas protection flow is 15~26m3/ h, casting time are 4~8min, electrode billet diameter For 560~610mm, it is stripped after 3~5h；
(5) anneal, 710~760 DEG C, 1~1.5min/mm of soaking time of annealing temperature, be furnace-cooled to 300~350 DEG C and come out of the stove；
(6) electroslag remelting, the electrode billet obtained using step (4), removing surface polishing, using calcirm-fluoride and oxidation aluminum binary slag System is smelted, and the molten speed value of starting point of electroslag smelting steady-state process is 7~10kg/min, and the molten speed value of terminal is 5.0~8.0kg/ Min, ESR ingot is obtained, then send forging process after the cold 80~100min of power failure stove；
(7) forge, the ESR ingot that step (6) obtains is heated to 1240~1260 DEG C, 15~25h of insulation is diffused homogeneous Change, then through upset pulling hammer cogging, be then again heated to 1240~1260 DEG C, 15~25h of insulation is diffused homogeneous Change, then carry out again tri- directions of X, Y and Z (i.e. three directions of length, width and height) it is upset after pull out again to finished size；
(8) ultra fine, the workpiece that step (7) obtains is inserted in heating furnace and is warming up to 1010~1040 DEG C with stove, insulation 5 After~10h, cooled down using the gap type of cooling of sky-water-sky-water, be specially：Come out of the stove and be air-cooled to 840~860 DEG C of surface When, quickly it is put into 25~30 DEG C of water and is cooled down, after water cooling to 860 DEG C~890 DEG C of central temperature, 2~5min of air cooling, so After reenter and be water-cooled to 700 DEG C~730 DEG C of central temperature after, 2~5min of air cooling, enter back into water and be cooled to center portion temperature 540 DEG C~560 DEG C or so, then workpiece is cooled down into 0.5h~2h in atmosphere so that workpiece surface highest returns temperature as 300~330 DEG C, treat that surface temperature carries out spheroidizing for 250 DEG C of -300 DEG C or so fed to boiler；
(9) spheroidizing, the workpiece that step (8) obtains is inserted in annealing furnace, is heated to 830~860 DEG C, be incubated 25~45h, Carry out spheroidizing.
2. preparation method according to claim 1, it is characterised in that hot die steel content meter by mass percentage For：C is 0.35-0.40%, Si≤0.25%, Mn 0.30-0.50%, Cr 5.00-5.30%, Mo 2.20-2.40%, V is 0.50-0.65%, P≤0.010%, S≤0.001%, Ni≤0.20%, Cu≤0.10%, Nb 0.005-0.020%, Surplus is Fe and inevitable impurity.
3. the preparation method described in claim 1~2, it is characterised in that the preparation method also includes such as after step (9) Lower step：
(10) horizontal, longitudinal non-notch impact specimen is cut along the centre in section on blank, specimen size is 7mm × 10mm × 55mm, sample, to 1020~1040 DEG C, are incubated 30min oil quenchings to room temperature with stove heat.
(11) it is tempered, the impact specimen obtained after step (10) is quenched is inserted in tempering furnace, is heated to 600~630 DEG C, insulation Time 120min, is then air-cooled to room temperature.
(12) tempering step of repeat step (11) 2~3 times so that impact specimen hardness is impacted after reaching 44~46HRC Work(performance detection.
4. the preparation method described in claim 1~2, it is characterised in that a diameter of 750mm of Electrode ESR ingot, weight Measure 5.7~6t.
5. the preparation method described in claim 3, it is characterised in that CaF in the binary slag system of step (6)2∶Al2O3For (67.5~72.5): (27.5~32.5).
6. the preparation method described in claim 3, it is characterised in that the quantity of slag in step (6) is 160~190kg.
7. the preparation method described in claim 3, it is characterised in that toast 6 at 600~650 DEG C before slag charge uses in step (6) ~8 hours.
8. the preparation method described in claim 3, it is characterised in that the addition of Antaciron described in step (1) be 1.8~ 2.5kg/t, the addition of the lime is 400kg/t, and the addition of the fluorite is 100kg/t.
9. the preparation method described in claim 3, it is characterised in that in the tapping process of step (1) plus aluminium amount for 1.8~ 2.5kg/t。
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CN114737138A (en) * 2022-04-14 2022-07-12 唐山志威科技有限公司 High-mirror-surface high-toughness oversized-section ZW863 die steel
CN115094307A (en) * 2022-05-30 2022-09-23 江苏联峰能源装备有限公司 Hot work die steel continuous casting round billet for electroslag remelting and production process thereof
CN114875204A (en) * 2022-06-08 2022-08-09 华北理工大学 Preparation method of die steel

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