CN101440462A - Economical long service life material for mechanical press forging die and manufacturing method thereof - Google Patents
Economical long service life material for mechanical press forging die and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides an economic material with long service life used for a mechanical press forging die and a manufacture method thereof. The material comprises the following compositions by weight percentage: 0.42 to 0.46 percent of C, 0.20 to 0.40 percent of Si, 0.80 to 1.00 percent of Mn, 1.90 to 2.10 percent of Cr, 0.18 to 0.22 percent of V, 0.42 to 0.48 percent of Mo, 0.30 to 0.50 percent of Ni, less than or equal to 0.20 percent of Cu, 0.02 to 0.05 percent of Ti, 0.018 to 0.045 percent of Al, less than or equal to 0.012 percent of P, less than or equal to 0.013 percent of S, less than or equal to 0.0100 percent of N, and the balance being Fe. The method comprises the following steps: casting the compositions to a large steel ingot over 10 tons according to the proportion by electric furnace and external refine smelting; hot loading the steel ingot at a temperature more than or equal to 650 DEG C; heating a forge furnace at a heating speed of between 100 and 150 DEG C/hour to a temperature of between 1,220 and 1, 240 DEG to be insulated for over 5 hours; and forging the steel ingot into the dimension of a finished product by continuous upsetting and drawing out in one heat at a temperature of between 850 and 1,150 DEG C with ratio of forging reduction more than or equal to 5. Compared with the prior mechanical press forging die steel which is used most widely at home and abroad, the material has lower alloy element value, and improves the service life of the die almost by 1 time under the condition of using the same mechanical press forging die.
Description
Technical field
The invention belongs to hot-work die and use the module field, especially relate to a kind of material for mechanical press forging die and manufacture method thereof.
Background technology
Hot-work die steel generally can be divided into die steel for hammer forging, mechanical press forging die steel, hot-extrusion mold steel, injection moulding die steel four classes according to purposes, and mechanical press forging die bears very big impact at work and cuts lotus; In forging process, mold cavity and the temperature forging stock about up to 1000 ℃ contacts, and the die-face temperature rise often reaches 300～400 ℃, and the part can reach 500～600 ℃ sometimes; Therefore, require mould when 500～600 ℃ of high temperature, can possess certain obdurability.
Domestic and international most popular mechanical press forging die steel is 5CrNiMo at present, and its standard analysis scope is: C0.50～0.60wt%, Si≤0.40wt%, Mn 0.50～0.80wt%, P≤0.030wt%, S≤0.030wt%, Cr 0.50～0.80wt%, Mo 0.15～0.30wt%, Ni 1.40～1.80wt%, Cu≤0.30wt%; Foreign grade of steel corresponding to this grade of steel has: U.S. AISI standard brand is L6, Japanese JIS standard brand SKT4, the german standard din trade mark 1.2713.The mentality of designing of this steel is to be to add a small amount of alloying element (≤3.00%) on the basis of 0.5%～0.60% steel to improve the hardening capacity and the temper resistance of steel at carbon containing, through quench and 450～500 ℃ of tempering after hardness be HRC43～45, thereby reach the service requirements of mechanical press forging die.But as main alloy strengthening element, Ni is non-carbide forming element with Ni, and the secondary hardening effect is poor during high tempering, and hardness sharply descended when use temperature was higher than 500 ℃, and poor heat stability causes mould to lose efficacy because of undercapacity.
The manufacturing process of above-mentioned existing 5CrNiMo module is to adopt electric arc furnace smelting, pours into steel ingot for forging the technology of becoming a useful person, and concrete steps are followed successively by steel-making, ingot casting, annealing, forging, thermal treatment, form product at last.Wherein, electric arc furnace smelting pours into 2.0 tons of-6.0 tons of steel ingots after finishing, and anneals earlier, forges after the finishing again and become a useful person.
There is following deficiency in above-mentioned manufacturing process:
1) the annealed processing of steel ingot, the Forge Heating time is long, energy consumption height, manufacturing cost height.
2) compare with the large steel ingot forging, little steel ingot forging yield in unit time is low, reduces fast forging machine production capacity, and manufacturing cost is increased.
3) forge to become a useful person and adopt 2 fire to become a useful person, the first fiery jumping-up, melt down reheat after, second fire pulls out to trimmed size, the cost of goods manifactured height.
Therefore, institute of relevant steel mill both domestic and external selects for use better material and manufacture method to substitute the 5CrNiMo module in research always.As follows to the correlation technique retrieval:
Chinese patent application CN200610038628.6 discloses " a kind of wear resistant hot forging cast steel for mold ", and this invention is to be the problem that casting and hot work tool steel wears no resistance, the life-span is on the low side of design of alloy foundation with toughness (impelling strength) in order to solve in the past.It is characterized in that adopting with the polishing machine is the design of alloy that foundation is carried out hot forged mould cast steel, and the V4C3 that carbide is separated out based on disperse in this wear resistant hot forging cast steel for mold also has a spot of Cr, Mo carbide, Cr, Mo are mainly as solid solution element, its alloying constituent is (wt%): C 0.2～0.4, and Cr 3.0～5.0, and Mo 2.0～3.5, Ni 1.0～2.0, V 0.6～1.2, Mn≤0.8, Si≤0.8, S≤0.04, P≤0.04.The wear resistant hot forging cast steel for mold of this invention can be widely used in the manufacturing of hot-forging die.
Chinese patent application CN02139193.9 " middle small cross-section mechanical press forging die high performance hot-work die steel ", it is characterized in that: the material of described die steel is the 4Cr2MoWVNi steel.This steel improves the high strength and the thermostability of steel with Mo, W, V; Cr, Mo, Ni guarantee the good hardening capacity of steel, and the suitable content of its Cr, Ni makes steel have good toughness.The 4Cr5MoVSi the highest with present application level compares, and under identical working conditions, improves 0.6～1 times die life, can forge more than ten thousand times.
Chinese patent application CN88106068.2 " high strength and high toughness die steel for hammer forging ", it contains the carbon of (weight percent) 0.25～0.32%, 1.70～2.10% chromium, 0.90～1.30% nickel, 0.80～1.00% molybdenum, 0.60～0.90% silicon, 0.50～0.80% manganese, other 0.40～0.80% tungsten, 0.30～0.50% vanadium, Yu Weitie and the impurity of also containing.This steel has at 600～650 ℃ and keeps high impelling strength, high heat resistance, high hardness, high thermostability and high thermal fatigue down after highly malleablized is handled, and can improve 200～300% than the life-span of existing die steel for hammer forging.This steel also can be used for making hot-extrusion mold.
It is to have the manufacturing cost height for solving in the present hot forged mould manufacturing technology for Chinese patent application CN02133244.4 " novel casting and hot work tool steel ", material use efficiency is lower, shortcomings such as the wasting of resources is big, realize " casting and forging ", improve casting and hot work tool steel heat resistanceheat resistant machine fatigue, resistance to wear, ability such as plasticity_resistant deformation, improve its work-ing life, reduce its manufacturing cost.Novel casting and hot work tool steel of the present invention contains following alloying constituent (wt%): C:0.15～0.35, Cr:1.5～3.75, Mo:0.5～2.5, Ni:0.6～2.5, V:0.1～0.8, W:0.1～0.8, Mn:0.2～0.6, Si:0.2～0.5, S≤0.04, P≤0.04.
From the composition design: the 1st patent is main design considerations to improve wear resistance, alloy content 〉=8%, and cost is higher; 2nd, 3,4 three patents all adopt tungsten as important carbide forming element, improve steel strength and thermohardening, and alloy content are greater than 5%, and alloy content of the present invention is lower, be controlled at about 3%, and do not adopt tungsten, obvious difference is arranged as adding alloying element.
On manufacturing process: 1st, 4 patents adopt cast shaping process, can improve material use efficiency, but steel keep casting flaw, influence the mould use properties.
In sum, in public technology known today and the Patent document data, alloy content is that about 3% mechanical press forging die adopts 5CrNiMo usually with steel, but poor heat stability, and mould can cause because use temperature rising hardness descends losing efficacy in continuous production.Mechanical press forging die material after the optimization is with the alloying element of tungsten as important raising hot strength, and alloy content all is controlled at 〉=more than 5%, even 〉=8%, production cost is higher relatively.Therefore, some patented technologies adopt cast molding technology to improve material use efficiency, cut the waste, but there is casting flaw in material, influence work-ing life.And alloy content is lower, and the not relevant at present patent of the economical long service life mechanical press forging die steel of better heat stability is announced.
Summary of the invention
The purpose of this invention is to provide a kind of economical long service life material for mechanical press forging die and manufacture method thereof, adopt not high cost to promote the thermostability of moulding stock, satisfy the mechanical press forging die service requirements.
For achieving the above object, technical scheme of the present invention is,
A kind of economical long service life material for mechanical press forging die, its composition weight percent is: C0.42～0.46, Si 0.20～0.40, Mn 0.80～1.00, Cr 1.90～2.10, V 0.18～0.22, Mo0.42～0.48, Ni 0.30～0.50, Cu≤0.20, Ti 0.02～0.05, Al 0.018～0.045, P≤0.012, S≤0.013, N≤0.0100, all the other are Fe and inevitable impurity.
Below be the effect and the qualification explanation thereof of principal element of the present invention:
C 0.42-0.46wt％
Carbon is decision die steel hardness and flexible principal element.In order to obtain high toughness and thermal fatigue resistance, quench, behind the high tempering in the matrix carbon content should remain on 0.20～0.25wt%, thermostability and the wear resistance in order to improve die steel needs certain carbide content simultaneously.The 5CrNiMo steel is owing to lack carbide forming element, carbon all molten with matrix among, form medium high carbon martensite, so toughness of material and anti-fatigue performance are relatively poor.The present invention reduces carbon content to 0.42-0.46wt%, make the part carbon combine carbide with chromium, molybdenum, titanium elements, improve thermostability and wear resistance, the part of staying matrix obtains low carbon martensite after quenching, compare medium high carbon martensite and have better toughness.
Si 0.20-0.40wt％
Silicon is not carbide forming element, and the present invention is controlled at the upper limit of 5CrNiMo steel with silicone content, makes the element silicon solid solution in α-Fe, improved the high-temperature oxidation resistance of material, and, the dispersity of three carbide of separating out when silicon can improve tempering transition is favourable to improving thermostability.
Mn 0.80-1.00wt％
Manganese element is not a carbide forming element, and a certain amount of manganese element can increase the matrix strengthening effect of steel and the transformation of deferrable bainite.And manganese can form the MnS of high-melting-point (1600 ℃) with sulphur, has eliminated the deleterious effect of sulphur to a certain extent.But manganese can promote growing up of crystal grain, when the massfraction of manganese surpasses 1%, the welding property of steel is degenerated.So the present invention slightly is increased to 0.80-1.00wt% than the manganese content of 5CrNiMo steel.
Cr 1.90-2.10wt％
The chromium element plays an important role in the design of this patent composition, component content has improved more than three times than the chromium content of original 5CrNiMo steel, the chromium element forms stable multiple carbide type in steel, mainly be that Cr7C3 and Cr23C6 type are strengthened matrix, the chromium element improves the hardening capacity of steel, and separates out stable disperse phase in the tempered process, and this disperse phase Cr7C3 not only can improve the anti-tempered performance of steel, and can make steel produce certain red hardness, improve the thermostability of steel.
Mo 0.42-0.48wt％
Molybdenum element also is one of main chemical elements in the design of this patent composition, the adding of molybdenum element has improved the hardening capacity of austenitic stability of steel and steel, and in the drawing process of steel, form separating out of stable Mo2C alloy carbide, this precipitation process is that a kind of particle strengthening phase of disperse is separated out, comparatively be evenly distributed in the matrix of steel, produce the matrix strengthening effect of important disperse carbide precipitate.The adding of molybdenum element has improved the thermostability of steel, and the raising of the over-all properties of steel is played an important role.
V 0.18-0.22wt％
V element also is one of important chemical element in this patent composition design, and its strengthening effect in steel is similar with molybdenum element, but v element forms in steel is the carbide of VC type, produces the strength property that dispersion-strengthened improves steel mutually.V element has also played the effect of the crystal grain of refinement steel in steel.
Ni 0.30-0.50wt％
Nickel element is not a main chemical elements of the present invention, compares with 5CrNiMo, and nickel content declines to a great extent, and the nickel element that keeps 0.30-0.50wt% is favourable with the toughness of improving steel to the hardening capacity that improves steel.
Ti 0.02-0.05wt％
Titanium elements also is one of important chemical element in the design of this patent composition, titanium can improve the heat resistance of steel, improve the creep-resistant property and the creep rupture strength of steel, simultaneously, titanium is the strong carbide forming element, and the TiC of formation has high stability and hardness, hinders the migration of austenite grain boundary, grain refinement effect is obvious, and is favourable to thermostability.Too much titanium elements can form TiN and be mingled with, and goes out along partial crystallization, reduces toughness of material and fatigue property.Suitable titanium content is 0.02-0.05wt%.
Al 0.018-0.045wt％
The nitrogen agent is decided in deoxidation when aluminium element is used as steel-making, crystal grain thinning, and the timeliness of inhibition soft steel is improved the toughness of steel when low temperature, has particularly reduced the brittle transition temperature of steel; But as too much, the greying tendency of steel will be promoted during deoxidation with the aluminium amount.Suitable aluminium content is 0.018-0.045wt%.
P≤0.020wt％；S≤0.015wt％；Cu≤0.20wt％；N≤0.0100wt％
Sulphur, phosphorus, copper are harmful elements in this patent steel, not only cause the deterioration of the processing characteristics of steel, reduce mechanical property, and increase the fragility of steel, reduce the impelling strength of steel.Nitrogen can form TiN with titanium elements and be mingled with in steel, separate out along crystal boundary, and die life is reduced, and therefore should reduce its content as far as possible under existing production specifications permission situation.
The 5CrNiMo steel with Ni as main alloy strengthening element, the strengthening mechanism of carbon martensite in the utilization, make material possess certain intensity and toughness, but Ni is non-carbide forming element, the secondary hardening effect is poor during high tempering, hardness sharply descended when use temperature was higher than 500 ℃, and poor heat stability causes mould to lose efficacy because of undercapacity.
Compare with the 5CrNiMo steel, the present invention reduces Ni content significantly, with non-carbide forming element Ni of carbide forming element Cr generation, suitably increase Mo simultaneously, V, strong carbide forming elements such as Ti, make part carbon and Cr, Mo, V, the Ti element is in conjunction with forming all kinds of carbide, MC is separated out in disperse when high tempering, M2C, the M3C carbide, play the secondary strengthening effect, the part of staying matrix obtains low carbon martensite after quenching, the secondary strengthening mechanism is separated out in the strengthening and toughening mechanism of of low carbon martensite and carbide tempering in the employing, compare 5CrNiMo and have better toughness, wear resistance and thermostability, use temperature can reach 650 ℃, longer service life.
In order to obtain better module performance, the present invention also provides a kind of manufacture method of above-mentioned economical long service life mechanical press forging die material, and it comprises the steps:
A) its composition weight percent is: C 0.42～0.46, Si 0.20～0.40, Mn 0.80～1.00, Cr 1.90～2.10, V 0.18～0.22, Mo 0.42～0.48, Ni 0.30～0.50, Cu≤0.20, Ti 0.02～0.05, Al 0.018～0.045, P≤0.012, S≤0.013, N≤0.0100, and all the other are Fe and inevitable impurity;
B) press the mentioned component proportioning, adopt electric furnace and external refining to smelt, and pour into large-scale steel ingot more than 10 tons;
C) steel ingot heat is sent, charging temperature 〉=650 ℃, in forge furnace, be heated to 1220 ℃～1240 ℃ with the heat-up rate of 100 ℃/h～150 ℃/h after insulation more than 5 hours;
D) forge, adopt a fiery jumping-up pulling to forge, steel ingot is forged to final dimension forging temperature: 1150 ℃～850 ℃; Control forging ratio 〉=5.
The Control essentials of manufacture method of the present invention:
Pour into a mould large-scale steel ingot more than 10 tons after electric furnace and the external refining, the steel ingot temperature descends slower, has guaranteed the hot feasibility of sending process implementing, and, in hot procedure, can obtain bigger forging compression ratio, can improve the segregation of forging Chemical Composition like this, improve homogeneity of structure.
Steel ingot heat is sent, charging temperature 〉=650 ℃, guaranteed that steel ingot can be because of temperature low yield looks varying stress, temperature field stress and cause cracking, and, because heat send steel ingot to make steel heart portion keep certain temperature, can improve rate of heating, the heat-up rate with 100 ℃/h～150 ℃/h in forge furnace is rapidly heated save energy.
Insulation made steel ingot heart portion heat penetration after steel ingot was heated to 1220 ℃～1240 ℃ more than 5 hours, and austenitic transformation is complete, and has played the effect of diffuse elements, can improve the component segregation of steel ingot.
From thermal analogy temperature analysis data presentation, forging temperature is the best viscous deformation zone of this material for interval 1150 ℃～850 ℃, material is positioned at austenite structure, can reduce resistance to deformation, effectively avoid forging cracking, near the austenitic transformation point, forge the back and within a short period of time structural transformation takes place simultaneously, steel grain growth defective obtains restraining.
Adopt a fiery jumping-up pulling forging manufacturing technique, control forging ratio 〉=5, thus improve the steel density, eliminated rarefaction defect.
Compare with aforementioned Chinese patent, from the composition design: the 1st patent is main design considerations to improve wear resistance, alloy content 〉=8%, and cost is higher; 2nd, 3,4 three patents all adopt tungsten as important carbide forming element, improve steel strength and thermohardening, and alloy content are greater than 5%, and alloy content of the present invention is lower, is controlled at about 3%, and does not adopt tungsten as adding alloying element, saved noble element, cost is lower.
On manufacturing process: 1st, 4 patents adopt cast shaping process, can improve material use efficiency, but steel keep casting flaw, and material is loose, influences the mould use properties; And the present invention adopts the forging process technology, has eliminated casting flaw, dense materials.
Beneficial effect of the present invention
1. the proportioning of chemical ingredients is more reasonable.Composition of the present invention is compared with 5CrNiMo, alloying element content is close, manufacturing cost is close, but owing to reduced the content of carbon, improve steel toughness, Ni content significantly reduces, with Cr for Ni, suitably increase Mo simultaneously, V, strong carbide forming elements such as Ti make part carbon and Cr, Mo, V, the Ti element is in conjunction with forming all kinds of carbide, and MC is separated out in disperse when high tempering, M2C, the M3C carbide, play the secondary strengthening effect, the part of staying matrix obtains low carbon martensite after quenching, compare 5CrNiMo and have better toughness, wear resistance and thermostability, longer service life.
2. manufacture method of the present invention adopts large steel ingot heat to send advanced manufacture method such as heating, a fiery jumping-up pulling forging manufacturing technique, save steel ingot annealing expense, shortened the Forge Heating time, and improve and forge operating rate, reduce manufacturing expense, had advantages such as easily manufactured, with low cost, dense materials.
3. rational chemical proportioning and advanced manufacturing process make the tissue of module and performance index obviously promote, and compare with the 5CrNiMo module:
Anti-tempered performance is better, and when adopting 650 ℃ of tempering, average hardness can reach 37HRC, exceeds nearly 11HRC than 5CrNiMo module;
Thermostability is better, and 5CrNiMo module thermostability temperature is about 570 ℃, and thermostability temperature of the present invention can reach more than 650 ℃, and use temperature improves about 80 ℃;
Longer service life through the practice test, adopts the present invention to substitute 5CrNiMo module maker forging die and can improve nearly 1 times work-ing life.
Embodiment
Below be specifying of the embodiment of the invention 1～6.
Embodiment 1
The chemical component weight per-cent of steel is C 0.42, and Si 0.24, and Mn 0.85, and Cr 1.95, and V 0.19, and Mo 0.47, and Ni 0.35, and Cu 0.12, and Ti 0.03, and Al 0.028, and P 0.010, and S 0.005, and N 0.0085, surplus Fe.
Pour into 13.5 tons of steel ingots after electrosmelting, external refining and vacuum outgas are handled, steel ingot is carrying out heat treated in fast forging machine process furnace, and the charging temperature of steel ingot is 750 ℃, be heated to 1230 ℃ with the heat-up rate of 120 ℃/h after the shove charge after insulation 5 hours;
Forging process:
The jumping-up operation is upset to 1/2 of the former height of steel ingot, and opening and forging temperature is 1170 ℃, and final forging temperature is 1060 ℃; The pulling operation is forged to final dimension, and opening and forging temperature is 1030 ℃, and final forging temperature is 870 ℃, forging ratio 5.3.
The concrete chemical ingredients of embodiment 2～6 (weight percent Wt%) is shown in Table 1, and embodiment 1 is pressed in processing parameter control.
Table 1 embodiment chemical ingredients
| Sequence number | C | Si | Mn | P | S | Cr | Mo | V | Ni | Cu | Ti | Al | N | Fe |
| 2 | 0.43 | 0.40 | 0.95 | 0.011 | 0.004 | 2.10 | 0.43 | 0.22 | 0.45 | 0.11 | 0.02 | 0.022 | 0.0088 | Surplus |
| 3 | 0.44 | 0.32 | 0.85 | 0.009 | 0.007 | 1.97 | 0.48 | 0.20 | 0.50 | 0.13 | 0.04 | 0.018 | 0.0083 | Surplus |
| 4 | 0.45 | 0.26 | 0.89 | 0.010 | 0.006 | 2.03 | 0.42 | 0.19 | 0.35 | 0.12 | 0.03 | 0.026 | 0.0079 | Surplus |
| 5 | 0.46 | 0.30 | 0.80 | 0.011 | 0.005 | 1.90 | 0.45 | 0.18 | 0.30 | 0.10 | 0.05 | 0.045 | 0.0091 | Surplus |
| 6 | 0.43 | 0.20 | 1.00 | 0.010 | 0.006 | 2.08 | 0.46 | 0.21 | 0.42 | 0.19 | 0.03 | 0.036 | 0.0076 | Surplus |
| Comparative Examples | 0.53 | 0.34 | 0.58 | 0.013 | 0.003 | 0.53 | 0.22 | - | 1.54 | 0.15 | - | - | - | Surplus |
Annotate: Comparative Examples adopts the prior art manufacturing for contrast steel grade 5CrNiMo.
The foregoing description is taken a sample, adopt 860 ℃～880 ℃ insulations 1 hour, oil cooling, quenching hardness is as follows:
Table 2 hardenability relatively
| Embodiment | 1# | 2# | 3# | 4# | 5# | 6# | Comparative Examples |
| Quenching hardness (HRC) | 58 | 57 | 57 | 58 | 59 | 57 | 57 |
Adopt the present invention can reach the hardenability identical with 5CrNiMo.
Adopt 860 ℃～880 ℃ insulations 1 hour, oil cooling adopts differing temps to carry out temper to room temperature, tempering insulation 2 hours, and tempered-hardness is referring to table 3:
Table 3 unit: HRC
Compare with the 7# steel, anti-tempered performance of the present invention significantly improves, and when adopting 650 ℃ of tempering, average hardness can reach 37HRC, exceeds nearly 11HRC than 5CrNiMo module.
Reduce to HRC35 as the thermal stability judging basis with hardness behind the sample insulation 2h, then 5CrNiMo module thermostability temperature is about 570 ℃, and thermostability temperature of the present invention can reach more than 650 ℃, and the thermostability temperature improves 80 ℃, has better hot strength and anti-tempered performance.
Adopt above-mentioned module to make the master wheel mechanical press forging die, work-ing life, situation was as follows:
Table 4 mechanical press forging die life-span consolidated statement
| Embodiment | Forging | Use equipment | Every secondary die production forging (part) |
| 1# | Master wheel | 800T forges machine soon | 5012 |
| 2# | Master wheel | 800T forges machine soon | 5058 |
| 3# | Master wheel | 800T forges machine soon | 4986 |
| 4# | Master wheel | 800T forges machine soon | 5102 |
| 5# | Master wheel | 800T forges machine soon | 5143 |
| 6# | Master wheel | 800T forges machine soon | 5099 |
| Comparative Examples | Master wheel | 800T forges machine soon | 2602 |
Compare with the 7# Comparative Examples, the every secondary die production forging number of the present invention can improve 0.91～0.97 times, longer service life on year-on-year basis.
Claims (2)
1. economical long service life material for mechanical press forging die, its composition weight percent is:
C 0.42～0.46
Si 0.20～0.40
Mn 0.80～1.00
Cr 1.90～2.10
V 0.18～0.22
Mo 0.42～0.48
Ni 0.30～0.50
Cu ≤0.20
Ti 0.02～0.05
Al 0.018～0.045
P ≤0.012
S ≤0.013
N ≤0.0100，
All the other are Fe and inevitable impurity.
2. the manufacture method of economical long service life material for mechanical press forging die as claimed in claim 1, it comprises the steps:
A) its composition weight percent is: C 0.42～0.46, Si 0.20～0.40, Mn 0.80～1.00, Cr 1.90～2.10, V 0.18～0.22, Mo 0.42～0.48, Ni 0.30～0.50, Cu≤0.20, Ti 0.02～0.05, Al 0.018～0.045, P≤0.012, S≤0.013, N≤0.0100, and all the other are Fe and inevitable impurity;
B) press the mentioned component proportioning, adopt electric furnace and external refining to smelt, and pour into large-scale steel ingot more than 10 tons;
C) steel ingot heat is sent, charging temperature 〉=650 ℃, in forge furnace, be heated to 1220 ℃～1240 ℃ with the heat-up rate of 100 ℃/h～150 ℃/h after insulation more than 5 hours;
D) forge, adopt a fiery jumping-up pulling to forge, steel ingot is forged to final dimension forging temperature: 1150 ℃～850 ℃; Control forging ratio 〉=5.
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| JPH0765141B2 (en) * | 1985-09-18 | 1995-07-12 | 日立金属株式会社 | Tool steel for hot working |
| US5505798A (en) * | 1994-06-22 | 1996-04-09 | Jerry L. Nelson | Method of producing a tool or die steel |
| CN1878881A (en) * | 2003-12-19 | 2006-12-13 | 大同特殊钢株式会社 | Hot work tool steel and mold member excellent in resistance to melting |
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