CN110129678A - A kind of economical fine grain high-toughness hot working die steel and preparation method thereof - Google Patents
A kind of economical fine grain high-toughness hot working die steel and preparation method thereof Download PDFInfo
- Publication number
- CN110129678A CN110129678A CN201910467663.7A CN201910467663A CN110129678A CN 110129678 A CN110129678 A CN 110129678A CN 201910467663 A CN201910467663 A CN 201910467663A CN 110129678 A CN110129678 A CN 110129678A
- Authority
- CN
- China
- Prior art keywords
- steel
- hours
- temperature
- forging
- cooled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- C21D1/30—Stress-relieving
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or 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
- 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
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Manufacturing & Machinery (AREA)
- Forging (AREA)
Abstract
The present invention relates to a kind of economical fine grain high-toughness hot working die steel GBL64 and preparation method thereof, belong to steel alloy manufacturing technology field.Its component prescription includes the element of following weight percent: C:0.25%~0.40%；Si:0.15%~1.2%；Mn:0.2%~0.9%；Cr:3%~6%；Mo:1.0%~3.5%；W:0.6%~2.2%, surplus are iron.Preparation method includes: melting, electroslag remelting, high temperature homogenization, jumping-up, pulling, stress relief annealing, ultra fine, modifier treatment.Economical hot die steel crystallite dimension obtained has excellent obdurability, high temperature friction and wear behavior, heat resistance, thermal stability, thermal fatigue property and high thermal conductivity carefully to about 0.5~3.5 μm.
Description
Technical field
The present invention relates to a kind of economical fine grain high-toughness hot working die steel GBL64 and preparation method thereof, belong to alloy steel
Make technical field.
Background technique
AISI H13 steel is that current mould industry uses one of the mould steel the most extensively sent out, the high temperature friction and wear of the product
Performance, high temperature heat resistance, thermal stability, thermal fatigue property and thermal conductivity are not able to satisfy the harshness of current high-strength steel hot still
Condition, is not able to satisfy the demand of mould industry gradually, and related substitute products are such as high tough 1.2367,8418/DIEVAR,
3Cr2W8V is suitable for die casting, and QRO90, HTCS-130 and DHA-THERMO are used for hot stamping die, and 5CrNiMo is for pressing
Casting and hot forged mould, but respectively have disadvantage, such as the toughness deficiency of QRO90,1.2367,5CrNiMo and 3Cr2W8V, 8418/DIEVAR
Heat it is insufficient by force, although HTCS-130 thermal conductivity is very high, heat resistance is very low.
Die life is promoted to be comprehensive, the universal thinking of industry is alloying component optimization, and aids in relatively harsh production
Equipment and process conditions, but still do not solve two problems: (1) expensive V element is still without finding suitable substitution,
Because VC plays the role of post-curing in H13 Series Steel；(2) the production dress of optimizing components common demands more stringent
Standby condition, so that the Special Steel Enterprise of middle underproductivity can not produce similar product.
Universal alloying thinking is to reduce chromium content, to promote thermal conductivity, and increases manganese content and promotes wearability, so
And chromium is Cr5 Series Die Steel core element, reduces chromium and is difficult to ensure inoxidizability and corrosion resistance；Increase manganese element
There is the risk for increasing big module manganese element segregation.In addition, current hot die steel assists still based on the flat-die forging of big module
In superfining process, the benign combination of the two could obtain fine and tissue is precipitated, but determine the sheet of impact flexibility and comprehensive performance
Matter grain size is still uncontrolled.In addition, high-strength intensity and thermal stability can be promoted simultaneously on the basis of crystal grain refinement, and
Good impact flexibility is kept, this is a great problem for perplexing current mold materials research worker.
Existing solution has:
(1) publication No. is that the patent document of CN109518084A discloses a kind of high heat conductance Forming Die containing Al, Nb nitriding
Has steel and preparation method thereof.Based on 4Cr5MoSiV1 steel alloy ingredient, C and Cr, Mo, V ratio are adjusted, adds Al, Nb, alloy contains
Amount fewer than 4Cr5MoSiV1 steel 1.5~2.0%.The steel of the invention is at low cost, toughness and 4Cr5MoSiV1 steel are suitable, has high fever
Conductance and nitriding, excellent wearability and resistance to tempering.But the Al in the heating molten steel easy to form of Al2O3, increase is mingled with
Object, in addition the range of Nb content is too big, and the addition of Nb is still unobvious to grain refining effect.
(2) publication No. is that the patent document of CN109136765A proposes a kind of hot-work die composition of steel, also discloses one
The preparation method of kind hot die steel, including ingredient, smelting, pouring, electroslag remelting；High temperature diffusion annealing, multiway forging heat add
Work；Conditioning treatment；Final heat treatment.Prepared steel has the advantages such as high thermal stability, heat resistance and good toughness,
Meet the high-temperature behavior requirement when front mold manufacture to its material.The special of the invention is to increase Mo content to 3.2%, is improved
Heat resistance and thermal conductivity, but the content of V is still higher, increased costs.
(3) publication No. is that the patent document of CN109023153A proposes a kind of micro nano-TiC particle Strengthening and Toughening in original position
Hot die steel is forged, relevant component prescription is proposed；Its technique is to be made in forging hot die steel with nano-TiC particle
For the tissue modulation agent of ordinary carbon steel and hardening agent, its toughness and plasticity are improved.But Ti element is added and easily forms TiN, it will be bright
The aobvious impact flexibility for reducing steel.
(4) patent document that publication No. is CN108950413A propose a kind of die steel material and preparation method thereof with
On the way.This method optimizes smelting process by addition trace Ti element, and using solution treatment, spheroidizing is handled, at quenching
Reason, tempering are heat-treated prepared hot die steel, and smelting obtains a kind of New Hot Work Die Steel material.This hair
It is bright that the hot die steel that makes that treated, the Thermal Fatigue Damage factor is significantly reduced by titanium microalloying and subsequent heat treatment technology,
Increase substantially its thermal fatigue resistance.But Ti element is added and easily forms TiN, the impact flexibility of steel will be substantially reduced.
(5) patent document that publication No. is CN109280849A proposes a kind of high performance hot-work die steel ingredient and its system
Technique is made, low-carbon C 0.20~0.30% reduces Cr to 3.10~4.00%, adds W 0.50~1.00%, reduces V to 0.10
~0.30%.The invention increases the alloying thinking of W using drop V, improves wearability well, reduces costs, but Cr content
It is lower, so that the steel grade hot-working character can't be very good.
(6) patent document that publication No. is CN109321826A propose a kind of high manganese and low chromium type hot-work die steel alloy at
Point and preparation method thereof, Ni to 0.80-3.00% is added, the harden ability of mould steel is improved.The invention is high manganese and low chromium type heat
Make mould steel, the promotion of Mn can improve wearability, but can also obviously increase Mn element segregation, so that ballistic work and cool-hot fatigue
It can be decreased obviously.
(7) patent document that publication No. is CN108265232A is using optimizing raw material formula, optimization smelting technology, optimization warm
Treatment process is worked on the three areas simultaneously, and the high stability of H13 is combined, and further improves thermal fatigue resistance, anti-tempered performance, heat is tough
Property, hence it is evident that improve the service life of mold.But alloying component proportion is not announced in the invention, therefore is difficult to judge that its performance is excellent
It is bad.
(8) publication No. is that the patent document of CN107974637A proposes a kind of hot die steel alloying component formula, is adopted
With high Mo content 2.80%~3.20%, the heat resistance and impact flexibility of mould steel are promoted.The invention uses the conjunction of the high Mo of high-carbon
Golden thinking, but still without preferable V alternative solution, mould steel cost is still higher.
(9) patent document that publication No. is CN108220815A proposes a kind of hot forging high heat-intensity, high impact toughness
The component prescription of hot die steel using high C 0.40~0.50%, low Cr:3.00~3.80%, and adds rare earth element
0.002~0.008%.By the way that rare earth is added to purify crystal boundary, impact flexibility has promotion, but the Adding Way of rare earth for the invention
Still without clear scheme and step.
(10) publication No. is that the patent document of CN107974632A proposes a kind of Austenitic Hot Work Die Steel component prescription
And preparation method thereof.The steel makes full use of austenite former Mn and C to expand austenite phase field to obtain stable austenite
Tissue；Utilize the carbide and Good-point set GA in directional solidification electroslag process control ESR ingot；Utilize heat treatment work appropriate
Skill controls decomposition and the pick-up behavior of crystallite dimension and carbide.The single austenite structure Forming Die that the invention is prepared
Tool steel no doubt can sufficiently promote the heat resistance of mould steel, heat resistance, but be not applied for H13 steel heat general on Vehicles Collected from Market
Treatment process makes its promote difficulty and increases, another is that there is no martensitic structures is good for the yield strength of austenite structure.
(11) publication No. is the patent document of CN108070794A, the invention propose a kind of high abrasion hot die steel at
Nanometer tungsten carbide 1.8-2.5% is added in distribution side and preparation method thereof, the steel, and molybdenum is reduced to 0.8-1.0%, and adds cerium oxide
0.06-0.1% sufficiently improves the heat resistance, grain size and tissue degree of purity of hot die steel.Composite ceramic powder is added in the invention
Body is beneficial to promote the wearability of mould steel, but the too complicated multiplicity of formula element of the patent, and production difficulty increases.
(12) publication No. is that the patent document of CN107904510A proposes a kind of high performance hot-work die steel alloying component
And preparation method thereof, Y 0.01-0.03% and Ir 0.02-0.05% and Sr 0.01-0.03% is added and purifies hot-work die
The steel of steel.The elevated temperature strength that the rare earth elements such as Y and Ir promote mould steel is added in the invention, and the control of rare earth metallurgy property is this
The a great problem of steel production.
(13) publication No. is the patent document of CN107400838A, which proposes a kind of high-wearing feature hot die steel
And preparation method thereof, which reduces chromium to 1.0-1.5% by addition carbon fibre composite 0.7-1.0%, adds
Nickel 1.0-1.5% and tungsten 0.1-0.2% is added to reach raising harden ability, the purpose of heat resistance.Carbon fiber, cost need to be added in the invention
Higher, Ni is also more, increased costs, and tearing tendency increases.
(14) publication No. is the patent document of CN107557667A, which proposes a kind of large die-casting mould high-performance
Hot die steel and its manufacturing process propose low C0.20%~0.30% for the production for realizing big section die casting, add W
0.10%~0.20% and Nb 0.02%~0.04%% realizes the purpose of high tenacity and high heat-intensity.It is a small amount of by increasing
W and Nb promote the heat resistance of mould steel, but the content of W is relatively low, and the Grain Refinement Effect of Nb is limited.
(15) patent document that publication No. is CN107699789A proposes a kind of high tenacity, high thermal stability ZW866 die casting
With hot die steel, thinking is a certain amount of Nb 0.005%-0.08% of addition, improves grain size, realizes that raising is comprehensive
The purpose of energy.Micro Nb element is wherein added, the control difficulty of high temperature heat processing technique is increased, otherwise would become hard to reach brilliant
The effect of grain refinement.
Therefore it needs to improve the prior art, to obtain a kind of economical fine grain high-toughness hot working die steel GBL64,
Cost is reduced, processing is facilitated.
Summary of the invention
It is an object of that present invention to provide a kind of economical fine grain high-toughness hot working die steel GBL64.
Another object of the present invention is to provide the preparation methods of above-mentioned economical fine grain high-toughness hot working die steel.
The present invention provides a kind of economical fine grain high-toughness hot working die steel GBL64, and component prescription includes following weight
The element of percentage: C:0.25%~0.40%；Si:0.15%~1.2%；Mn:0.2%~0.9%；Cr:3%~6%；
Mo:1.0%~3.5%；W:0.6%~2.2%, surplus are iron and micro inevitable residual elements S, P, N, O, H.
Wherein, S, P, N, O, H are the acceptable impurity of content.
More preferably, formula includes the element of following weight percent:
C:0.28%~0.40%；Si:0.20%~1.05%；Mn:0.25%~0.85%；Cr:3.5%~5.5%；
Mo:1.2%~3.4%；W:0.8%~2%, surplus are iron and micro residue element S, P, N, O, H.Wherein, S, P, N, O,
H is the acceptable impurity of content.
In a preferred embodiment of the present invention, formula includes the element of following weight percent:
C:0.28%；Si:, 1.05%；Mn:0.85%；Cr:3.6%；Mo:2.2%；W:2%, surplus are iron, Yi Jiwei
Measure residual elements S, P, N, O, H.Wherein, S, P, N, O, H are the acceptable impurity of content, and content is respectively 1~200ppm.
Above-mentioned mould steel is named as GBL64, and G generation claims " work " i.e. Shanghai University Of Engineering Science, and BL generation claims " must be grand " i.e. must be grand
Mold materials science and technology (Nantong) Co., Ltd, 64 be the sequence number of steel.
The preparation method of above-mentioned economical fine grain high-toughness hot working die steel, using technical process below and step:
1) melting: ingredient is put into melting in electric arc furnaces, after molten alloy ingredient touches the mark, extremely by molten steel temperature control
1520-1540 DEG C is cast to formation electrode rod iron, clearing electrode stick surface scale and pit defect after demoulding in mold；
2) electroslag remelting: electrode bar carry out electroslag remelting, make melting molten steel after slag system filters, slow crystallization and freezing at
Round steel ingot；
3) high temperature homogenization: round steel ingot is heated to 1230~1265 DEG C, soaking time is that (0.2~0.4) × D is small
When, D is steel ingot diameter dimension (cm), keeps component diffusion in steel uniform, is subsequently cooled to 1180 ± 10 DEG C of forging temperature；
4) 1180 DEG C of ± 10 DEG C of steel ingots jumping-up: are subjected to jumping-up to 40%~50% high along steel ingot short transverse on press
Degree, then finishing are melted down and are heated 2-4 hours at 1180 DEG C ± 10 DEG C；Carry out second of jumping-up again, finishing, melt down 1180 DEG C ±
2~4 hours are kept the temperature at 10 DEG C, then carries out third time jumping-up, finishing remains 870 DEG C of final forging temperature or more；
5) it pulls out: the steel ingot three times repeatedly after jumping-up being pulled out and forged to final size obtains module, keep eventually
870 DEG C~900 DEG C of temperature of forging, hole is cooled to 350 ± 10 DEG C or so after pulling；
6) stress relief annealing: being heated to 850 ± 10 DEG C for module and anneal 10~16 hours, eliminates stress, then cold with furnace
But；
7) ultra fine: module is heated to 1060~1100 DEG C and keeps the temperature (0.2~0.25) × d hours, d has for forging
Imitate size cm, water quenching to room temperature；860 ± 10 DEG C of isothermals (0.4~0.6) × d hours are then heated to, d is forging effective dimensions
cm；Then it is furnace-cooled to 740 ± 10 DEG C, isothermal (0.9~1.2) × d hour, d is forging effective dimensions cm, then with being furnace-cooled to room
Temperature；When forging is pole, effective dimensions is its diameter；When forging is plate, effective dimensions is its thickness；
8) modifier treatment: being heated to 1060 ± 10 DEG C for module and keep the temperature 1.5~2.5 hours, vacuum air-quenching to room temperature, and 560
± 10 DEG C are tempered 9~11 hours, after being air-cooled to room temperature, are tempered 9~11 hours, come out of the stove air-cooled at 600 ± 10 DEG C.
Preferably, round steel ingot is heated to 1230~1265 DEG C when step 3) high temperature homogenization, soaking time is (0.3
~0.4) × D hours, D be steel ingot diameter dimension (cm), keep component diffusion in steel uniform, be subsequently cooled to forging temperature 1180 ±
10℃。
Preferably, when step 7) ultra fine, module is heated to 1060~1100 DEG C of heat preservation (0.2~0.25) × d
Hour, d is forging effective dimensions cm, water quenching to room temperature；Then heat to 860 ± 10 DEG C of isothermals (0.4~0.5) × d hours, d
For forging effective dimensions cm；Then be furnace-cooled to 740 DEG C, isothermal (0.9~1) × d hour, d is forging effective dimensions cm, then with
It is furnace-cooled to room temperature.
In step 2), by electroslag remelting, filtered in removal electrode bar after most of not neat by metallurgical slag,
The slow crystallization and freezing of molten steel forms round steel ingot.
Some terms according to the present invention are explained as follows.
Electrode bar: for the base material of electroslag remelting, with cast molding after arc melting.
Electroslag remelting: the method that the resistance heat generated when passing through slag using electric current carries out melting as heat source.Its purpose
It is to improve metal purity, improves ingot casting crystallization.
Steel ingot: molten steel solidifies the steel ingot to form certain shapes through Sheng ladle injection mold.
High temperature homogenization: at high temperature by transgranular uneven components under diffusion elimination or the practical crystallization condition of reduction and partially
From in the structural state of balance, improve the processing performance of alloy material and the heat treatment process of service performance.
Segregation: each component phenomenon unevenly distributed in crystallization in alloy.
Jumping-up: make the forging process that blank height reduces and cross section increases.It improves the horizontal mechanical performance of forging and subtracts
Few anisotropy；Jumping-up and pulling make it be evenly distributed repeatedly to smash the carbide in alloy tool steel.
Pulling: refer to it is all reduce cross-sectional area, length increase forging process.
Fine: the steel alloy with Carbide Precipitation behavior is adopted by the easy to process and subsequent good toughness of guarantee
A kind of heat treatment process, the technique slowly make small and dispersed with furnace cold cut for after heat steel to austenitizing temperature
Alloy carbide is uniformly precipitated, and spheroiding of slowly growing up.Then with furnace cold cut to room temperature.Steel after fine have good
Dimensional stability and machinability, and it is subsequent it is quenched after impact flexibility it is preferable.
W, Mo is the comprehensive effective element for promoting wearability, high temperature heat resistance and thermal conductivity, and the disperse educt of WC can
Grain coarsening is prevented, the present invention increases molybdenum on the basis of 4Cr5MoSiV1 composition of steel and adds tungsten, forms the wear-resisting analysis of WC of small and dispersed
Phase out, this precipitated phase is intensive to be pinned at around small grains, hinders growing up for crystal grain, and removes the relatively high V of cost
Element replaces VC with the reinforcing of WC；Therefore, this kind of economical fine grain hot die steel will be than H13 and 8418 steel with lower
Cost, better wearability, Gao Wenre obdurability and thermal conductivity.
The economical hot die steel GBL64 crystallite dimension of the present invention is carefully to about 0.5-3.5 μm, with excellent tough
Property, high temperature friction and wear behavior, heat resistance, thermal stability, thermal fatigue property and high thermal conductivity.
The beneficial effects of the present invention are:
(1) impact flexibility of the economical steel grade GBL64 of the invention surmounts the excellent level of H13, not only has excellent high temperature
Friction and wear behavior, high temperature heat resistance, thermal stability, thermal fatigue property, and also part solid solution Mo and W element will be obviously improved heat
Conductance.
(2) due to being beneficial to conventional mass production and realizing the invention steel from the refinement for realizing grain size at subangle
Stablize trial-production.
(3) grain size for promoting hot die steel is maintained at 8 grades of ASTM or more by the present invention, hardness 42-48HRC range,
7 × 10 × 55 non-notch style ballistic works are greater than 300J.
Detailed description of the invention
Fig. 1 is 1000 times of metallographic structure figures of 1 mould steel of embodiment
Fig. 2 is the test comparison chart of 600 DEG C of tempering 1 mould steel of embodiment and H13 steel thermal stability
Fig. 3 is the test comparison chart of 1 mould steel of embodiment and H13 steel fretting wear coefficient
Fig. 4 is the comparison diagram of 1 mould steel of embodiment and H13 steel thermal conductivity
Specific embodiment
Technical solution of the present invention is illustrated below in conjunction with specific embodiment.
Embodiment 1
The component prescription of the high tough hot stamping die steel GBL64 of economical fine grain contains following weight percent element:
C:0.28%；Si:1.05%；Mn:0.85%；Cr:3.6%；Mo:2.2%；W:2%；Fe and micro residue element
S, P, N, O, H are surplus.
In the present embodiment, the technical process of GBL64 steel and steps are as follows:
1) ingredient: being put into melting in electric arc furnaces by melting according to the ratio, after metallurgically reaches requirement, temperature control to about 1520-
1540 DEG C are cast intoElectrode bar, descaling and the defects of pit after electrode bar demoulding.
2) electroslag remelting: carrying out electroslag remelting refining for electrode bar, filters big portion in removal electrode bar by metallurgical slag
Divide not neat, then the slow crystallization and freezing of molten steel is at 1 ton of round steel ingot (diameter about 320mm).
3) high temperature homogenization: by 1 ton of Heating Steel Ingots to 1245 ± 10 DEG C, 11 hours are kept the temperature, then slow cooling to 1180 ± 10
DEG C prepare forging processing.
4) jumping-up: by 1180 DEG C of steel ingots along steel ingot short transverse jumping-up to 45% height, then finishing (i.e. will with press
Irregular edge flattens), it melts down 1180 ± 10 DEG C and heats 3 hours, then carry out second of jumping-up, finishing, melt down 1180 ±
10 DEG C keep the temperature 3 hours, then carry out third time jumping-up, and finishing is kept for 870 DEG C of final forging temperature or more.
5) pull out: to the steel ingot three times repeatedly after jumping-up forge pulling to final size 165mm × 520mm ×
1550mm (thickness × width × length), effective dimensions 165mm are kept for 870 DEG C of final forging temperature or more, and hole is cooled to 350 after pulling
DEG C or so.
6) stress relief annealing: module is heated to 850 ± 10 DEG C and is annealed 10 hours, stress is eliminated, then with furnace cold cut.
7) ultra fine: module is heated to 1060 ± 10 DEG C and keeps the temperature 3.5 hours, water quenching to room temperature then heats to
860 ± 10 DEG C isothermal 7 hours, be then furnace-cooled to 740 ± 10 DEG C, isothermal 15 hours, then with being furnace-cooled to room temperature.
8) modifier treatment: being heated to 1060 ± 10 DEG C for module and keep the temperature 2 hours, vacuum air-quenching to room temperature, 560 DEG C of tempering 10
Hour, after being air-cooled to room temperature, it is tempered 10 hours, comes out of the stove air-cooled at 600 ± 10 DEG C.
Obtained mould steel metallographic structure figure (1000 times) is as shown in Figure 1.Crystallite dimension carefully to about 0.5~3.5 μm,
8 grades of ASTM or more.
Performance test
Above-mentioned GBL64 steel is tested for the property, as a result as follows:
(1) quenched rear hardness 43HRC；
(2) the style ballistic work of non-notch 7 × 10 × 55 is greater than 300J；
Open the ballistic work 30J of U-shaped notch
(3) thermal stability: thermal stability expression way herein are as follows: the GBL64 steel time different in 600 DEG C of heat preservations,
The downward trend of hardness is the quality judgement of thermal stability.The comparative test of thermal stability is carried out with H13 steel simultaneously.Comparison of ingredients
(wt.%) as shown in table 1, thermal stability data compare as shown in table 2 (unit: HRC) and Fig. 2.
(4) GBL64 steel and H13 steel carry out the test of fretting wear coefficient, as a result as shown in Figure 3.
(5) GBL64 steel and H13 steel carry out the test of thermal conductivity, thermal conductivity variation with temperature result with laser heat conducting instrument
As shown in Figure 4.
1 H13 and GBL64 composition of steel of table compares
| Grade of steel | C | Si | Mn | Cr | Mo | W | S | P |
| H13 | 0.42 | 1.05 | 0.85 | 5.2 | 1.25 | 0 | 0.002 | 0.006 |
| GBL64 | 0.28 | 1.05 | 0.85 | 3.6 | 2.2 | 2 | 0.002 | 0.009 |
2 600 DEG C of tempering different time H13 and GBL64 steel hardness of table compare
| Grade of steel | 5h | 10h | 15h | 20h | 25h | 30h | 35h | 40h |
| H13 | 46 | 45 | 42 | 39 | 37 | 36 | 34 | 28 |
| GBL64 | 47 | 44 | 44 | 40 | 39 | 38 | 36 | 36 |
Claims (8)
1. a kind of economical fine grain high-toughness hot working die steel, which is characterized in that its component prescription includes following weight percent
Element: C:0.25%~0.40%；Si:0.15%~1.2%；Mn:0.2%~0.9%；Cr:3%~6%；Mo:1.0%
~3.5%；W:0.6%~2.2%, surplus are iron and micro residue element S, P, N, O, H.
2. economical fine grain high-toughness hot working die steel according to claim 1, which is characterized in that formula includes following heavy
Measure the element of percentage:
C:0.28%~0.35%；Si:0.20%~1.05%；Mn:0.25%~0.85%；Cr:3.5%~5.5%；Mo:
1.2%~3.4%；W:0.8%~2%, surplus are iron and micro residue element S, P, N, O, H.
3. economical fine grain high-toughness hot working die steel according to claim 1, which is characterized in that formula includes following heavy
Measure the element of percentage:
C:0.28%；Si:1.05%；Mn:0.85%；Cr:3.6%；Mo:2.2%；W:2%, surplus are iron and micro residual
Remaining element S, P, N, O, H.
4. described in any item economical fine grain high-toughness hot working die steels according to claim 1~3, which is characterized in that wherein,
S, P, N, O, H are the acceptable impurity of content.
5. the preparation method of economical fine grain high-toughness hot working die steel according to any one of claims 1 to 4, feature
It is, step includes:
1) melting: being put into melting in electric arc furnaces for ingredient, after molten alloy ingredient touches the mark, by molten steel temperature control to 1520-
1540 DEG C are cast to formation electrode rod iron, clearing electrode stick surface scale and pit defect after demoulding in mold；
2) electroslag remelting: electrode bar carries out electroslag remelting, makes the molten steel of melting after slag system filters, slow crystallization and freezing is at circle
Steel ingot；
3) high temperature homogenization: round steel ingot is heated to 1230-1265 DEG C, soaking time is (0.2~0.4) × D hours, and D is
Steel ingot diameter dimension cm, keeps component diffusion in steel uniform, is subsequently cooled to 1180 ± 10 DEG C of forging temperature；
4) jumping-up: by 1180 DEG C of ± 10 DEG C of steel ingots on press along steel ingot short transverse carry out jumping-up to 40%~50% height,
Then heating 2-4 hours is melted down in finishing；Second of jumping-up is carried out again, and finishing melts down heat preservation 2-4 hours, then carries out third time upsetting
Slightly, finishing remains 870 DEG C of final forging temperature or more；
5) it pulls out: the steel ingot three times repeatedly after jumping-up being pulled out and forged to final size obtains module, keep finish-forging temperature
870 DEG C~920 DEG C or more of degree, hole is cooled to 350 ± 10 DEG C after pulling；
6) stress relief annealing: module is heated to 850 ± 10 DEG C of annealing 10-16 hours, eliminates stress, then furnace cooling；
7) ultra fine: being heated to 1060~1100 DEG C for module and keep the temperature (0.2~0.3) × d hours, and d is the effective ruler of forging
Very little cm, water quenching to room temperature；860 ± 10 DEG C of isothermals (0.4~0.6) × d hours are then heated to, d is forging effective dimensions cm；With
After be furnace-cooled to 740 ± 10 DEG C, isothermal (0.9~1.2) × d hours, d is forging effective dimensions cm, then with being furnace-cooled to room temperature；
8) modifier treatment: being heated to 1060 ± 10 DEG C for module and keep the temperature 1.5~2.5 hours, vacuum air-quenching to room temperature, and 560 ± 10
DEG C tempering 9~11 hours, after being air-cooled to room temperature, 600 ± 10 DEG C be tempered 9~11 hours, come out of the stove air-cooled.
6. the preparation method of economical fine grain high-toughness hot working die steel according to claim 5, which is characterized in that step
3) round steel ingot is heated to 1230~1265 DEG C when high temperature homogenization, soaking time is (0.3~0.4) × D hours, and D is steel
Ingot diameter dimension (cm), keeps component diffusion in steel uniform, is subsequently cooled to 1180 ± 10 DEG C of forging temperature.
7. the preparation method of economical fine grain high-toughness hot working die steel according to claim 5, which is characterized in that step
7) when ultra fine, module is heated to 1060~1100 DEG C and keeps the temperature (0.2~0.25) × d hours, d is forging effective dimensions
Cm, water quenching to room temperature；860 ± 10 DEG C of isothermals (0.4~0.5) × d hours are then heated to, d is forging effective dimensions cm；Then
It is furnace-cooled to 740 DEG C, isothermal (0.9~1) × d hours, d is forging effective dimensions cm, then with being furnace-cooled to room temperature.
8. the preparation method of economical fine grain high-toughness hot working die steel according to claim 5, which is characterized in that step
2) sand pit is embedded to after electroslag remelting to be cooled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467663.7A CN110129678B (en) | 2019-05-31 | 2019-05-31 | Economical fine-grain high-toughness hot-work die steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910467663.7A CN110129678B (en) | 2019-05-31 | 2019-05-31 | Economical fine-grain high-toughness hot-work die steel and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110129678A true CN110129678A (en) | 2019-08-16 |
| CN110129678B CN110129678B (en) | 2021-02-05 |
Family
ID=67583426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910467663.7A Active CN110129678B (en) | 2019-05-31 | 2019-05-31 | Economical fine-grain high-toughness hot-work die steel and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110129678B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468345A (en) * | 2019-08-29 | 2019-11-19 | 江苏大学 | A kind of hot die steel of high abrasion |
| CN110669982A (en) * | 2019-10-08 | 2020-01-10 | 鞍钢股份有限公司 | Microalloyed die steel with high purity and preparation method thereof |
| CN111041176A (en) * | 2019-12-30 | 2020-04-21 | 吕鹏昊 | Heat treatment process of hot work die steel |
| CN112501520A (en) * | 2020-12-03 | 2021-03-16 | 上海工程技术大学 | Impact-resistant and smashing-resistant wear-resistant steel and preparation method thereof |
| CN112626414A (en) * | 2020-12-03 | 2021-04-09 | 上海工程技术大学 | Economical low-alloy hot-work die steel and preparation method thereof |
| CN113913589A (en) * | 2021-09-26 | 2022-01-11 | 云南昆钢耐磨材料科技股份有限公司 | Preparation method of high-wear-resistance alloy steel forging |
| CN114990423A (en) * | 2021-11-22 | 2022-09-02 | 上海双舜科技发展有限公司 | Production method of high-toughness hot-working die steel |
| CN116377330A (en) * | 2023-04-08 | 2023-07-04 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392353A (en) * | 2008-10-30 | 2009-03-25 | 上海大学 | High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof |
| CN102212756A (en) * | 2011-05-04 | 2011-10-12 | 上海大学 | Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof |
| CN103334061A (en) * | 2013-06-18 | 2013-10-02 | 上海大学 | Die-casting die steel with high heat conductivity and large section and preparation and heat treatment method thereof |
| CN107557667A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of large die-casting mould high performance hot-work die steel and its manufacturing process |
-
2019
- 2019-05-31 CN CN201910467663.7A patent/CN110129678B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392353A (en) * | 2008-10-30 | 2009-03-25 | 上海大学 | High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof |
| CN102212756A (en) * | 2011-05-04 | 2011-10-12 | 上海大学 | Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof |
| CN103334061A (en) * | 2013-06-18 | 2013-10-02 | 上海大学 | Die-casting die steel with high heat conductivity and large section and preparation and heat treatment method thereof |
| CN107557667A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of large die-casting mould high performance hot-work die steel and its manufacturing process |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110468345A (en) * | 2019-08-29 | 2019-11-19 | 江苏大学 | A kind of hot die steel of high abrasion |
| CN110669982A (en) * | 2019-10-08 | 2020-01-10 | 鞍钢股份有限公司 | Microalloyed die steel with high purity and preparation method thereof |
| CN111041176A (en) * | 2019-12-30 | 2020-04-21 | 吕鹏昊 | Heat treatment process of hot work die steel |
| CN111041176B (en) * | 2019-12-30 | 2021-06-29 | 吕鹏昊 | Heat treatment process of hot work die steel |
| CN112501520A (en) * | 2020-12-03 | 2021-03-16 | 上海工程技术大学 | Impact-resistant and smashing-resistant wear-resistant steel and preparation method thereof |
| CN112626414A (en) * | 2020-12-03 | 2021-04-09 | 上海工程技术大学 | Economical low-alloy hot-work die steel and preparation method thereof |
| CN112501520B (en) * | 2020-12-03 | 2021-12-10 | 上海工程技术大学 | Impact-resistant and smashing-resistant wear-resistant steel and preparation method thereof |
| CN113913589A (en) * | 2021-09-26 | 2022-01-11 | 云南昆钢耐磨材料科技股份有限公司 | Preparation method of high-wear-resistance alloy steel forging |
| CN113913589B (en) * | 2021-09-26 | 2024-01-16 | 云南昆钢耐磨材料科技股份有限公司 | Preparation method of high-wear-resistance alloy steel forging |
| CN114990423A (en) * | 2021-11-22 | 2022-09-02 | 上海双舜科技发展有限公司 | Production method of high-toughness hot-working die steel |
| CN116377330A (en) * | 2023-04-08 | 2023-07-04 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
| CN116377330B (en) * | 2023-04-08 | 2024-02-09 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110129678B (en) | 2021-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110172641A (en) | A kind of fine grain high-toughness hot working die steel and preparation method thereof | |
| CN110129678A (en) | A kind of economical fine grain high-toughness hot working die steel and preparation method thereof | |
| CN109252104A (en) | High-speed steel and production method thereof | |
| CN102691005B (en) | Low alloy die steel | |
| CN107779746B (en) | Ultra-fine grain alloy steel with ultrahigh strength, high toughness, corrosion resistance, oxidation resistance and preparation method thereof | |
| CN107974636A (en) | A kind of high rigidity high-hardenability pre-hardening plastic die steel and preparation method thereof | |
| CN110484812A (en) | A kind of high-performance hot stamping die steel and its manufacturing process | |
| CN104911501B (en) | A kind of superhigh intensity high-carbon dislocation type martensite steel and preparation method thereof | |
| CN104313462A (en) | High wear-resistant hot-stamping die steel and manufacturing method thereof | |
| CN114411043B (en) | Preparation method of large hot forging hot work die steel | |
| CN110055464A (en) | Tough hot stamping die steel of a kind of fine grain height and preparation method thereof | |
| CN102899589A (en) | High-strength non-tempered bainite steel and preparation method thereof | |
| CN104561802A (en) | High-hardness high-toughness cold work die steel as well as preparation method thereof | |
| CN111850393B (en) | Bainite die steel and preparation method thereof | |
| CN106480373A (en) | Non-quenched and tempered cold-heading steel wire rod for 9.8-grade fastener and production method thereof | |
| CN101942606B (en) | Nitrogen alloyed austenitic hot work die steel and preparation method thereof | |
| CN105483562A (en) | High-bending-resistance, high-strength and high-toughness die steel and manufacturing method thereof | |
| CN116516130B (en) | Cr-Mo-V hot work die steel with high hardness and high impact toughness and preparation method thereof | |
| CN112626414A (en) | Economical low-alloy hot-work die steel and preparation method thereof | |
| CN103805909A (en) | Preparation method of austenitic hot-work die steel | |
| CN102876996A (en) | Austenitic hot-work die steel and preparation method thereof | |
| CN114703431B (en) | Heat treatment process for homogenizing hot-work die steel and annealed structure | |
| CN109628833B (en) | Cr-Mo-Si-V cold-work die steel and preparation method thereof | |
| US20240068078A1 (en) | Die steel with a high thermal diffusion coefficient and its preparation methods | |
| CN106480376A (en) | Non-quenched and tempered cold-heading steel wire rod for 10.9-grade fastener and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |