CN102312172A - B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof - Google Patents

B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof Download PDF

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CN102312172A
CN102312172A CN201110297667A CN201110297667A CN102312172A CN 102312172 A CN102312172 A CN 102312172A CN 201110297667 A CN201110297667 A CN 201110297667A CN 201110297667 A CN201110297667 A CN 201110297667A CN 102312172 A CN102312172 A CN 102312172A
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insulation
tempering
stove
forging
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CN102312172B (en
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曹衍学
王波
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SHANDONG YUANDA MATERIAL TECHNOLOGY CO., LTD.
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SHANDONG YUANDA MOULD MATERIAL CO Ltd
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Abstract

The invention provides 4Cr3MoWVNi (B3R) hot work die steel with high strength and toughness and resistance to tempering, and a preparation process thereof. Raw materials for preparing the B3R hot work die steel comprise, by weight, C 0.35 to 0.42%, Si 0.15 to 0.35%, Mn 0.3 to 0.5%, Cr 2.50 to 3.50%, Mo 1.00 to 1.50%, W 0.50 to 0.80%, V 0.50 to 0.80%, Ni 1.45 to 1.85%, S 0.003 to 0.010% and P 0.008 to 0.018%, with the balance being Fe. The preparation process comprises the following steps: smelting at intermediate frequency--remelting (refining) of electroslag-diffusion hydrogen of electroslag ingots, annealing treatment of electroslag ingots--forging--annealing of forging stocks--rough machining--vacuum heat treatment, and secondary tempering so as to obtain the novel product of die steel. The hot work die steel prepared in the invention has high Rockwell hardness, excellent impact toughness and tempering (thermal fatigue) resistance, and the advantages of optimized collocation of components, pure steel quality, a uniform structure, high strength, strong toughness, good tempering resistance, etc.

Description

The anti-tempering B3R of high-strong toughness hot-work die steel and preparation method thereof
Technical field
The invention belongs to the metallurgical technology technical field, relate to a kind of novel hot-work die material.
Background technology
Hot-work die is divided into hammering, die forging, extruding and several kinds of main types of die casting, comprises hot-forging die, pressing machine forging die, punching die, hot extruding die and metal crimp mold etc.The working conditions of hot-work die is quite complicated and abominable, at work except that will bearing huge mechanical stress, also will bear and be heated repeatedly and cool off caused thermal stresses.Therefore; Because the decision of its Working environment and mission thereof; Material to hot-work die is that hotwork die steel is just had higher requirement: hot-work die steel is except that should having high hardness, intensity, wear resistance and toughness; Also should have good high-temperature intensity, thermal fatigue stability, thermal conductivity and solidity to corrosion, require to have higher hardening capacity and anti-tempered performance in addition, have consistent mechanical property to guarantee whole cross section.
The existing heat commonly used of China is done die steel roughly to be had: 4Cr5MoSiV1 (H13), 3Cr2W8V, 3Cr2MoWVNi (B3) etc.
4Cr5MoSiV1 (H13) hot-work die steel is the most frequently used hot-work die steel of China; It has good toughness, cold-and-heat resistent fatigue property and anti-liquid metal erosion property; But its working temperature but is confined to below 630 ℃; Because the content of Cr, Mo, V noble element is higher, causes manufacturing cost also higher, its anti-tempering (thermal fatigue) poor-performing of while; 3Cr2W8V is that a kind of traditional heat is done die steel, and 3Cr2MoWVNi (B3) is a kind of novel hot-work die steel commonly used, and they all have the characteristics of high heat-intensity; Be that anti-tempered performance is than higher; Working temperature can reach about 650 ℃, and has good forging, mechanical workout and thermal treatment process performance, but their chemical ingredients proportioning alloying effect is not too good; Their forgeability, cold and hot fatigue property is relatively poor, impelling strength is relatively poor; Mould regular meeting is because generation of cracks, cracking, thereby causes mould early failure to be scrapped, when particularly adopting water to be heat-eliminating medium; This phenomenon is more outstanding, and the mold hot fatigue property of these two kinds of material is also relatively lower simultaneously.
Therefore; Present domestic technical field of hot working die steel; Urgent need is developed a kind of New Hot Work Die Steel material with good mechanical properties, intensity, impelling strength and anti-tempering (thermal fatigue) performance; It must have the advantage of the wider model of higher over-all properties, range of application than existing hot-work die steel 4Cr5MoSiV1 (H13), 3Cr2W8V, 3Cr2MoWVNi (B3); Because mould is the mother of industry,, also will bring good economic benefit and social benefit so have crucial meaning in industry manufacture field and technical field of mold.
Summary of the invention
The purpose of this invention is to provide the anti-tempering 4Cr3MoWVNi of a kind of high-strong toughness (B3R) hot-work die steel and preparation method thereof, be confined to below 630 ℃ to solve the prior art products temperature, manufacturing cost is high, anti-tempering (thermal fatigue) poor-performing; Cold and hot fatigue property is relatively poor, impelling strength is relatively poor, causes mould generation of cracks, cracking, thus problem such as cause that mould early failure is scrapped.
The technical solution adopted for the present invention to solve the technical problems is to improve hot-work die steel material composition proportioning and preparation method, the relative H13 of material composition proportioning has improved the content of C, W, Ni, reduced the content of Cr, Mo, V; Relatively 3Cr2W8V, 3Cr2MoWVNi (B3) have improved the content of C, Cr, Ni; Reduced the content of S, P harmful element; Obtain the anti-tempering 4Cr3MoWVNi of high-strong toughness (B3R) hot-work die steel, make component prescription more be tending towards reasonably optimizing, reduced the manufacturing cost of material; Improved forgeability and toughness, laid the foundation for the processing through subsequent technique obtains good comprehensive performances.Adopted esr, ESR ingot to expand modern techniquies such as hydrogen, forging, vacuum heat treatment among the preparation technology of the present invention simultaneously, the excellent comprehensive performance of product is achieved.Its material composition content and weight percent are: C:0.35-0.42%; Si:0.15-0.35%; Mn:0.3-0.5%; Cr:2.50-3.50%; Mo:1.00-1.50%; W:0.50-0.80%; V:0.50-0.80%; Ni:1.45-1.85%; S:0.003-0.010%; P:0.008-0.018%; Fe: surplus.Preparing method's step is following:
(1) intermediate frequency is smelted:
According to above-mentioned chemical ingredients prescription batching; Drop in the medium-frequency induction furnace, throw the stokehold, after treating that institute's furnace charge of throwing is even fully and melting 500 ℃ of oven dry of the basic lining that is adopted 3 hours; Tapping casting becomes the electrode ingot; The molten steel tapping temperature is controlled at 1550-1580 ℃, and the electrode ingot that is cast into changes next step over to and uses;
(2) esr (refining):
Above-mentioned electrode ingot is carried out esr, obtain ESR ingot, chemical ingredients is even to reach refining and modifying, reduce gas content and to be mingled with material, to obtain, the electroslag remelting steel ingot of dense structure, and its processing parameter is following:
The plain slag system proportioning of quaternary: aluminum oxide 32-34%; Quicklime 15-17%; Calcium Fluoride (Fluorspan) 45-47%; Silicon oxide 2-8%;
Voltage: voltage control is at 55-65V during electric slag refusion and smelting;
Electric current: because the size of electric current decision speed of melting, and the too fast meeting of speed of melting causes the inside of ESR ingot loose, thus with current control within the 7500-8000A scope;
Melting packing ratio: be controlled between the 0.45-0.5;
Mold water outlet water temperature: be controlled between 45-65 ℃;
(3) ESR ingot expands hydrogen, anneal:
With being warming up to 845-855 ℃ of insulation 6 hours after the above-mentioned ESR ingot shove charge; Cool to 715-725 ℃ of insulation 10 hours with the furnace; Be chilled to 675-685 ℃ of insulation 10 hours with stove then, insulation is accomplished the back and is chilled to below 400 ℃ with stove and comes out of the stove, and accomplishes ESR ingot expansion hydrogen, anneal; Reach further uniform formation, remove hydrogen content in the steel, improve the purpose of steel over-all properties;
(4) forge:
With the ESR ingot room temperature shove charge after above-mentioned expansion hydrogen, the anneal, be heated to 650-680 ℃ of insulation 45-60 minute; Be warming up to 950-1000 ℃ of insulation 45-60 minute once more; Heat up once more after the completion and heat, be heated to 1150-1180 ℃ of insulation 20-30 minute; The forging of coming out of the stove, 1150 ℃ of initial forging temperatures forge through upsetting pull repeatedly, forging ratio >=7, final forging temperature is controlled at 900-930 ℃, forges to change forging stock over to the holding furnace insulation after accomplishing;
(5) forging stock annealing:
Change above-mentioned forging stock over to spheroidizing annealing furnace by holding furnace; Be warming up to 860-880 ℃ of insulation 8 hours, be chilled to below 400 ℃ with stove and come out of the stove, accomplish the annealing of forging stock;
(6) roughing:
With the roughing of the forging stock after the above-mentioned annealing, reach order or design requirements geometrical dimension through traditional machining apparatus completion such as band saw machine, milling machine forging stock;
(7) vacuum heat treatment:
Quench:
The material base that roughing is good is put into the vacuum quencher post-heating to 545-555 ℃ of insulation, and soaking time is looked material base thickness and decided, and calculates by 0.25 minute/mm; Carry out subordinate phase after insulation is accomplished and heat up, be warming up to 875-885 ℃ of insulation, soaking time is looked material base thickness and is decided, and calculates by 0.3 minute/mm; Heat up for the third time after the secondary insulation is accomplished, be warming up to 1025-1035 ℃ of insulation, soaking time is looked material base thickness and is decided, and calculates by 0.3 minute/mm; Following oil quenching in precooling 2-3 minute after insulation is accomplished, oily temperature control treats that at 35-50 ℃ workpiece is chilled to 150-180 ℃ and comes out of the stove, and changes down the operation tempering immediately over to;
B, tempering:
With the above-mentioned hard-tempered work piece vertically vacuum tempering furnace of promptly packing into, be warming up to 565-575 ℃ of insulation 6 hours, the air cooling of coming out of the stove is accomplished tempering for the first time to room temperature; After treating that workpiece is chilled to room temperature, the vacuum tempering furnace of packing into once more is heated to 6 hours air coolings of coming out of the stove of 545-555 ℃ of insulation to room temperature, accomplishes tempering for the second time; Finally make 4Cr3MoWVNi of the present invention (B3R) hot-work die steel.
The present invention has adopted esr on process method; Make material obtain secondary refining; Reduced nonmetal inclusion material and the obnoxious flavour content in the steel; Simultaneously can realize reducing the harmful element sulphur in the steel, improve the both macro and micro tissue of electroslag remelting steel ingot, obtain that chemical ingredients is even, the fine steel of dense structure; The present invention has simultaneously adopted advanced vacuum heat treatment process technology, makes quenching of the present invention back material obtain uniform Rockwell hardness and good impelling strength, does not have the surface decarburization layer, has improved the over-all properties of material.
The hot-work die steel that adopts the present invention to make has higher Rockwell hardness; Anti-tempering (thermal fatigue) performance is also better; Simultaneously also have good impelling strength, solved the anti-tempering of existing 4Cr5MoSiV1 commonly used (H13) hot-work die steel (thermal fatigue) poor-performing; 3Cr2W8V, the relatively poor adverse effect of 3Cr2MoWVNi (B3) impelling strength collect the advantage of above three kinds of materials, are a kind of novel high-quality hot-work die steels.Have that ratio optimization, steel are pure, advantage such as homogeneous microstructure, HS, obdurability, anti-tempered performance are good.
Description of drawings
In implementation process of the present invention, we have done a large amount of 4Cr5MoSiV1 (H13), 3Cr2W8V, 3Cr2MoWVNi (B3) control experiments relatively, have obtained following diagram conclusion:
Accompanying drawing 1, accompanying drawing 2 are after the present invention and existing 4Cr5MoSiV1 commonly used (H13), 3Cr2W8V, 3Cr2MoWVNi (B3) hot-work die steel adopt separately quenching technology to quench, under identical tempering temperature condition with comparison result to the hardness and the impelling strength of these several kinds of hot-work die steels:
Fig. 1 be the present invention under identical tempering temperature condition with the hardness comparison diagram of 4Cr5MoSiV1 (H13) hot-work die steel, can find out that by test-results among the figure the present invention has anti-tempered performance preferably than existing 4Cr5MoSiV1 commonly used (H13) hot-work die steel.
Fig. 2 is the present invention and 3Cr2W8V, the impelling strength comparison diagram of 3Cr2MoWVNi (B3) hot-work die steel under identical tempering temperature condition; Can find out that by test-results among the figure the present invention has toughness preferably than existing 3Cr2W8V, 3Cr2MoWVNi (B3) hot-work die steel.
Embodiment
Embodiment 1
Present embodiment adopts the present invention to make the anti-tempering 4Cr3MoWVNi of 500 * 500 * 230 high-strong toughnesies (B3R) hot-work die steel, and the chemical ingredients proportioning that is adopted is C:0355%; Si:0.17%; Mn:0.32%; Cr:2.55%; Mo:1.11%; W:0.55%; V:0.55%; Ni:1.55%; S:0.005%; P:0.009%; Fe: surplus.
The concrete grammar step of present embodiment is following:
(1) intermediate frequency is smelted:
According to above-mentioned chemical ingredients formulation ratio batching 550kg, drop in the medium-frequency induction furnace, throw the stokehold with 500 ℃ of oven dry of the basic lining that is adopted 3 hours, after treating that institute's furnace charge of throwing is even fully and melting, tapping casting becomes the electrode ingot, and the molten steel tapping temperature is 1550 ℃;
(2) esr (refining): above-mentioned electrode ingot is carried out esr, and its processing parameter is following:
A, the plain slag system proportioning of quaternary: aluminum oxide 32%; Quicklime 15%; Calcium Fluoride (Fluorspan) 46%; Silicon oxide 7%;
B, voltage: this implementation process adopts voltage 55V;
C, electric current: it is 7700A that this implementation process adopts electric current;
D, melting packing ratio: the packing ratio of this implementation process is 0.45;
E, present embodiment mold water outlet water temperature are 45 ℃;
(3) ESR ingot expands hydrogen, anneal:
Present embodiment technology is: be warming up to 845 ℃ of insulations 6 hours after the above-mentioned ESR ingot shove charge, cool to 715 ℃ of insulations 10 hours with the furnace, be chilled to 675 ℃ of insulations 10 hours with stove then, be chilled to 380 ℃ with stove after insulation is accomplished and come out of the stove;
(4) forge:
With the ESR ingot room temperature shove charge after above-mentioned expansion hydrogen, the anneal, be heated to 650 ℃ of insulations 50 minutes; Be warming up to 950 ℃ of insulations 50 minutes once more; Heat up once more after the completion and heat, be heated to 1150 ℃ of insulations 25 minutes; The forging of coming out of the stove detects through infrared thermometer, and 1150 ℃ of initial forging temperatures forge through 4 upsetting pulls, calculates that to forge be 7.55, detects through infrared thermometer, and final forging temperature is 900 ℃, forges to change forging stock over to the holding furnace insulation after accomplishing;
(5) forging stock annealing:
Change above-mentioned forging stock over to spheroidizing annealing furnace by holding furnace; Be warming up to 860 ℃ of insulations 8 hours, be chilled to 380 ℃ with stove and come out of the stove, accomplish the annealing of forging stock;
(6) roughing:
With the roughing of the forging stock after the above-mentioned annealing, reach design requirements geometrical dimension 500 * 500 * 230 through traditional machining apparatus completion such as band saw machine, milling machine forging stock;
(7) vacuum heat treatment:
A, quenching:
The material base that above-mentioned roughing is good is put into ℃ insulation of vacuum quencher post-heating to 545, soaking time 60 minutes; Carry out subordinate phase after insulation is accomplished and heat up, be warming up to 875 ℃ of insulations, soaking time 70 minutes; Heat up for the third time after the secondary insulation is accomplished, be warming up to 1025 ℃ of insulations, soaking time 70 minutes; Precooling oil quenching down after 2 minutes after insulation is accomplished, oily temperature is 50 ℃, treats that workpiece is chilled to 150 ℃ and comes out of the stove, and changes the vacuum tempering furnace tempering immediately over to;
B, tempering:
With the above-mentioned hard-tempered workpiece vacuum tempering furnace of packing into, be warming up to 565 ℃ of insulations 6 hours, the air cooling of coming out of the stove is accomplished tempering for the first time to room temperature; After treating that workpiece is chilled to room temperature, the vacuum tempering furnace of packing into once more is heated to 6 hours air coolings of coming out of the stove of 545 ℃ of insulations to room temperature, accomplishes tempering for the second time.
Embodiment 2
Present embodiment adopts the present invention to make the anti-tempering 4Cr3MoWVNi of 300 * 300 * 150 high-strong toughnesies (B3R) hot-work die steel, and the chemical ingredients proportioning that is adopted is C:0.39%; Si:0.25%; Mn:0.41%; Cr:3.05%; Mo:1.25%; W:0.65%; V:0.66%; Ni:1.65%; S:0.007%; P:0.012%; Fe: surplus.
The concrete grammar step of present embodiment is following:
(1) intermediate frequency is smelted:
According to above-mentioned chemical ingredients formulation ratio batching 200kg, drop in the medium-frequency induction furnace, throw the stokehold with 500 ℃ of oven dry of the basic lining that is adopted 3 hours, after treating that institute's furnace charge of throwing is even fully and melting, tapping casting becomes the electrode ingot, and the molten steel tapping temperature is 1570 ℃;
(2) esr (refining):
Above-mentioned electrode ingot is carried out esr, and its processing parameter is following:
A, the plain slag system proportioning of quaternary: aluminum oxide 33%; Quicklime 16%; Calcium Fluoride (Fluorspan) 46%; Silicon oxide 5%;
B, voltage: this implementation process adopts voltage 60V;
C, electric current: it is 7800A that this implementation process adopts electric current;
D, melting packing ratio: the packing ratio of this implementation process is 0.47;
E, present embodiment mold water outlet water temperature are 58 ℃;
(3) ESR ingot expands hydrogen, anneal:
Present embodiment technology is: be warming up to 850 ℃ of insulations 6 hours after the above-mentioned ESR ingot shove charge, cool to 720 ℃ of insulations 10 hours with the furnace, be chilled to 680 ℃ of insulations 10 hours with stove then, be chilled to 390 ℃ with stove after insulation is accomplished and come out of the stove;
(4) forge:
With the ESR ingot room temperature shove charge after above-mentioned expansion hydrogen, the anneal, be heated to 660 ℃ of insulations 60 minutes; Be warming up to 980 ℃ of insulations 55 minutes once more; Heat up once more after the completion and heat, be heated to 1170 ℃ of insulations 30 minutes; The forging of coming out of the stove detects through infrared thermometer, and 1150 ℃ of initial forging temperatures forge through 5 upsetting pulls, calculates that to forge be 8.5, detects through infrared thermometer, and final forging temperature is 920 ℃, forges to change forging stock over to the holding furnace insulation after accomplishing;
(5) forging stock annealing:
Change above-mentioned forging stock over to spheroidizing annealing furnace by holding furnace; Be warming up to 870 ℃ of insulations 8 hours, be chilled to 390 ℃ with stove and come out of the stove, accomplish the annealing of forging stock;
(6) roughing:
With the roughing of the forging stock after the above-mentioned annealing, reach design requirements geometrical dimension 300 * 300 * 150 through traditional machining apparatus completion such as band saw machine, milling machine forging stock;
(7) vacuum heat treatment:
A, quenching:
The material base that above-mentioned roughing is good is put into ℃ insulation of vacuum quencher post-heating to 550, soaking time 40 minutes; Carry out subordinate phase after insulation is accomplished and heat up, be warming up to 880 ℃ of insulations, soaking time 45 minutes; Heat up for the third time after the secondary insulation is accomplished, be warming up to 1030 ℃ of insulations, soaking time 45 minutes; Precooling oil quenching down after 3 minutes after insulation is accomplished, oily temperature is 45 ℃, treats that workpiece is chilled to 180 ℃ and comes out of the stove, and changes the vacuum tempering furnace tempering immediately over to;
B, tempering:
With the above-mentioned hard-tempered workpiece vacuum tempering furnace of packing into, be warming up to 570 ℃ of insulations 6 hours, the air cooling of coming out of the stove is accomplished tempering for the first time to room temperature; After treating that workpiece is chilled to room temperature, the vacuum tempering furnace of packing into once more is heated to 6 hours air coolings of coming out of the stove of 550 ℃ of insulations to room temperature, accomplishes tempering for the second time.
Embodiment 3
Present embodiment adopts the present invention to make the anti-tempering 4Cr3MoWVNi of 400 * 400 * 200 high-strong toughnesies (B3R) hot-work die steel, and the chemical ingredients proportioning that is adopted is C:0.415%; Si:0.335%; Mn:0.49%; Cr:3.35%; Mo:1.45%; W:0.75%; V:0.77%; Ni:1.80%; S:0.009%; P:0.016%; Fe: surplus.
The concrete grammar step of present embodiment is following:
(1) intermediate frequency is smelted:
According to above-mentioned chemical ingredients formulation ratio batching 350kg, drop in the medium-frequency induction furnace, throw the stokehold with 500 ℃ of oven dry of the basic lining that is adopted 3 hours, after treating that institute's furnace charge of throwing is even fully and melting, tapping casting becomes the electrode ingot, and the molten steel tapping temperature is 1580 ℃;
(2) esr (refining): above-mentioned electrode ingot is carried out esr, and its processing parameter is following:
A, the plain slag system proportioning of quaternary: aluminum oxide 34%; Quicklime 17%; Calcium Fluoride (Fluorspan) 47%; Silicon oxide 2%;
B, voltage: this implementation process adopts voltage 65V;
C, electric current: it is 8000A that this implementation process adopts electric current;
D, melting packing ratio: the packing ratio of this implementation process is 0.49;
E, present embodiment mold water outlet water temperature are 63 ℃;
(3) ESR ingot expands hydrogen, anneal:
Present embodiment technology is: be warming up to 855 ℃ of insulations 6 hours after the above-mentioned ESR ingot shove charge, cool to 725 ℃ of insulations 10 hours with the furnace, be chilled to 685 ℃ of insulations 10 hours with stove then, be chilled to 350 ℃ with stove after insulation is accomplished and come out of the stove;
(4) forge:
With the ESR ingot room temperature shove charge after above-mentioned expansion hydrogen, the anneal, be heated to 680 ℃ of insulations 60 minutes; Be warming up to 1000 ℃ of insulations 50 minutes once more; Heat up once more after the completion and heat, be heated to 1180 ℃ of insulations 28 minutes; The forging of coming out of the stove detects through infrared thermometer, and 1150 ℃ of initial forging temperatures forge through 4 upsetting pulls, calculates that to forge be 7.5, detects through infrared thermometer, and final forging temperature is 930 ℃, forges to change forging stock over to the holding furnace insulation after accomplishing;
(5) forging stock annealing:
Change above-mentioned forging stock over to spheroidizing annealing furnace by holding furnace; Be warming up to 880 ℃ of insulations 8 hours, be chilled to 385 ℃ with stove and come out of the stove, accomplish the annealing of forging stock;
(6) roughing:
With the roughing of the forging stock after the above-mentioned annealing, reach design requirements geometrical dimension 400 * 400 * 200 through traditional machining apparatus completion such as band saw machine, milling machine forging stock;
(7) vacuum heat treatment:
A, quenching:
The material base that above-mentioned roughing is good is put into ℃ insulation of vacuum quencher post-heating to 555, soaking time 50 minutes; Carry out subordinate phase after insulation is accomplished and heat up, be warming up to 885 ℃ of insulations, soaking time 60 minutes; Heat up for the third time after the secondary insulation is accomplished, be warming up to 1035 ℃ of insulations, soaking time 60 minutes; Precooling oil quenching down after 2 minutes after insulation is accomplished, oily temperature is 40 ℃, treats that workpiece is chilled to 180 ℃ and comes out of the stove, and changes the vacuum tempering furnace tempering immediately over to;
B, tempering:
With the above-mentioned hard-tempered workpiece vacuum tempering furnace of packing into, be warming up to 575 ℃ of insulations 6 hours, the air cooling of coming out of the stove is accomplished tempering for the first time to room temperature; After treating that workpiece is chilled to room temperature, the vacuum tempering furnace of packing into once more is heated to 6 hours air coolings of coming out of the stove of 555 ℃ of insulations to room temperature, accomplishes tempering for the second time.

Claims (2)

1. the anti-tempering B3R of a high-strong toughness hot-work die steel is characterized in that material composition content and weight percent: C:0.35-0.42%; Si:0.15-0.35%; Mn:0.3-0.5%; Cr:2.50-3.50%; Mo:1.00-1.50%; W:0.50-0.80%; V:0.50-0.80%; Ni:1.45-1.85%; S:0.003-0.010%; P:0.008-0.018%; Fe: surplus.
2. the anti-tempering B3R of high-strong toughness hot-work die steel preparation technology is characterized in that step of preparation process is following:
(1) esr refining: intermediate frequency is smelted the electrode ingot obtain carry out esr, it is following to be made into its processing parameter of ESR ingot:
A, the plain slag system proportioning of quaternary: aluminum oxide 32-34%; Quicklime 15-17%; Calcium Fluoride (Fluorspan) 45-47%; Silicon oxide 2-8%;
B, voltage: voltage control is at 55-65V during electric slag refusion and smelting;
C, electric current: because the size of electric current decision speed of melting, and the too fast meeting of speed of melting causes the inside of ESR ingot loose, thus with current control within the 7500-8000A scope;
D, melting packing ratio: be controlled between the 0.45-0.5;
E, mold water outlet water temperature: be controlled between 45-65 ℃;
(2) ESR ingot expands hydrogen, anneal:
With being warming up to 845-855 ℃ of insulation 6 hours after the ESR ingot shove charge; Cool to 715-725 ℃ of insulation 10 hours with the furnace; Be chilled to 675-685 ℃ of insulation 10 hours with stove then, insulation is accomplished the back and is chilled to below 400 ℃ with stove and comes out of the stove, and accomplishes ESR ingot expansion hydrogen, anneal; Reach further uniform formation, remove hydrogen content in the steel, improve the purpose of steel over-all properties;
(3) forge:
With the ESR ingot room temperature shove charge after expansion hydrogen, the anneal, be heated to 650-680 ℃ of insulation 45-60 minute; Be warming up to 950-1000 ℃ of insulation 45-60 minute once more; Heat up once more after the completion and heat, be heated to 1150-1180 ℃ of insulation 20-30 minute; The forging of coming out of the stove, 1150 ℃ of initial forging temperatures forge through upsetting pull repeatedly, forging ratio >=7, final forging temperature is controlled at 900-930 ℃, forges to change forging stock over to the holding furnace insulation after accomplishing;
(4) forging stock annealing:
Change forging stock over to spheroidizing annealing furnace by holding furnace; Be warming up to 860-880 ℃ of insulation 8 hours, be chilled to below 400 ℃ with stove and come out of the stove, accomplish the annealing of forging stock;
(5) vacuum heat treatment:
A, quenching:
The material base that roughing is good is put into the vacuum quencher post-heating to 545-555 ℃ of insulation, and soaking time is looked material base thickness and decided, and calculates by 0.25 minute/mm; Carry out subordinate phase after insulation is accomplished and heat up, be warming up to 875-885 ℃ of insulation, soaking time is looked material base thickness and is decided, and calculates by 0.3 minute/mm; Heat up for the third time after the secondary insulation is accomplished, be warming up to 1025-1035 ℃ of insulation, soaking time is looked material base thickness and is decided, and calculates by 0.3 minute/mm; Following oil quenching in precooling 2-3 minute after insulation is accomplished, oily temperature control treats that at 35-50 ℃ workpiece is chilled to 150-180 ℃ and comes out of the stove, and changes down the operation tempering immediately over to;
B, tempering:
With the above-mentioned hard-tempered work piece vertically vacuum tempering furnace of promptly packing into, be warming up to 565-575 ℃ of insulation 6 hours, the air cooling of coming out of the stove is accomplished tempering for the first time to room temperature; After treating that workpiece is chilled to room temperature, the vacuum tempering furnace of packing into once more is heated to 6 hours air coolings of coming out of the stove of 545-555 ℃ of insulation to room temperature, accomplishes tempering for the second time.
CN 201110297667 2011-09-29 2011-09-29 B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof Active CN102312172B (en)

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CN102605190A (en) * 2012-04-10 2012-07-25 山东远大模具材料有限公司 Mold steel electroslag re-melting slag system and use method of mold steel electroslag re-melting slag system
CN103938096A (en) * 2014-04-28 2014-07-23 钢铁研究总院 High-strength high-toughness hot work die steel and preparation method thereof
CN104152807A (en) * 2014-08-03 2014-11-19 内蒙古北方重工业集团有限公司 Preparation method of high-capacity light-weight high-pressure gas cylinder
CN105112785A (en) * 2015-09-09 2015-12-02 天津那诺机械制造有限公司 High-temperature-creep-resistant low-temperature die steel and preparation method thereof
CN105364433A (en) * 2015-11-27 2016-03-02 昆山惠众机电有限公司 Hot-working die production technology
CN105436824A (en) * 2015-11-25 2016-03-30 湖南耐普泵业股份有限公司 Machining method for sieve plate
CN106111864A (en) * 2016-06-20 2016-11-16 安徽省瑞杰锻造有限责任公司 A kind of processing technique of split type loose tool
CN106222543A (en) * 2016-08-29 2016-12-14 营口市特殊钢锻造有限责任公司 A kind of Cr1 series hot die steel and heat treatment method thereof
CN108193023A (en) * 2017-12-01 2018-06-22 内蒙古北方重工业集团有限公司 The method for eliminating net carbide in H13 mould steel annealing microscopic structure
CN108220766A (en) * 2016-12-13 2018-06-29 鞍钢股份有限公司 A kind of Cr-V series hot die steels and preparation method thereof
CN108823510A (en) * 2018-07-03 2018-11-16 苏州百旺模具模型有限公司 A kind of mold that integral strength is high
CN108893686A (en) * 2018-07-03 2018-11-27 苏州百旺模具模型有限公司 It is a kind of will not crack deformation mold
CN110055475A (en) * 2019-04-28 2019-07-26 江苏羽立新材料科技有限公司 A kind of roll low-phosphorous sulphur rare-earth alloy material and preparation method thereof
CN110195194A (en) * 2018-11-08 2019-09-03 李岩 A kind of preparation method of hot die steel
CN110318002A (en) * 2018-03-29 2019-10-11 湖北长怡特钢贸易有限公司 A kind of high-fire resistance 4Cr3Mo3W4VNb hot die steel
CN111270061A (en) * 2020-02-13 2020-06-12 江油市长祥特殊钢制造有限公司 Preparation method of 8407 hot-working die-casting die steel

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CN1410586A (en) * 2002-10-18 2003-04-16 东风汽车公司 High performance hot working die steel for medium and small cross profile machine forging mould

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CN1410586A (en) * 2002-10-18 2003-04-16 东风汽车公司 High performance hot working die steel for medium and small cross profile machine forging mould

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102605190A (en) * 2012-04-10 2012-07-25 山东远大模具材料有限公司 Mold steel electroslag re-melting slag system and use method of mold steel electroslag re-melting slag system
CN103938096A (en) * 2014-04-28 2014-07-23 钢铁研究总院 High-strength high-toughness hot work die steel and preparation method thereof
CN104152807A (en) * 2014-08-03 2014-11-19 内蒙古北方重工业集团有限公司 Preparation method of high-capacity light-weight high-pressure gas cylinder
CN104152807B (en) * 2014-08-03 2016-03-16 内蒙古北方重工业集团有限公司 The preparation method of high-capacity light gas cylinder
CN105112785A (en) * 2015-09-09 2015-12-02 天津那诺机械制造有限公司 High-temperature-creep-resistant low-temperature die steel and preparation method thereof
CN105436824A (en) * 2015-11-25 2016-03-30 湖南耐普泵业股份有限公司 Machining method for sieve plate
CN105364433A (en) * 2015-11-27 2016-03-02 昆山惠众机电有限公司 Hot-working die production technology
CN106111864A (en) * 2016-06-20 2016-11-16 安徽省瑞杰锻造有限责任公司 A kind of processing technique of split type loose tool
CN106111864B (en) * 2016-06-20 2018-01-23 安徽省瑞杰锻造有限责任公司 A kind of processing technology of split type loose tool
CN106222543A (en) * 2016-08-29 2016-12-14 营口市特殊钢锻造有限责任公司 A kind of Cr1 series hot die steel and heat treatment method thereof
CN106222543B (en) * 2016-08-29 2018-10-09 营口市特殊钢锻造有限责任公司 A kind of Cr1 series hot die steel and its heat treatment method
CN108220766A (en) * 2016-12-13 2018-06-29 鞍钢股份有限公司 A kind of Cr-V series hot die steels and preparation method thereof
CN108193023A (en) * 2017-12-01 2018-06-22 内蒙古北方重工业集团有限公司 The method for eliminating net carbide in H13 mould steel annealing microscopic structure
CN110318002A (en) * 2018-03-29 2019-10-11 湖北长怡特钢贸易有限公司 A kind of high-fire resistance 4Cr3Mo3W4VNb hot die steel
CN108823510A (en) * 2018-07-03 2018-11-16 苏州百旺模具模型有限公司 A kind of mold that integral strength is high
CN108893686A (en) * 2018-07-03 2018-11-27 苏州百旺模具模型有限公司 It is a kind of will not crack deformation mold
CN110195194A (en) * 2018-11-08 2019-09-03 李岩 A kind of preparation method of hot die steel
CN110055475A (en) * 2019-04-28 2019-07-26 江苏羽立新材料科技有限公司 A kind of roll low-phosphorous sulphur rare-earth alloy material and preparation method thereof
CN111270061A (en) * 2020-02-13 2020-06-12 江油市长祥特殊钢制造有限公司 Preparation method of 8407 hot-working die-casting die steel

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