CN105483562A - High-bending-resistance, high-strength and high-toughness die steel and manufacturing method thereof - Google Patents
High-bending-resistance, high-strength and high-toughness die steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to high-bending-resistance, high-strength and high-toughness die steel and belongs to the technology of cold stamping die materials. The problem that existing die steel is poor in bending resistance and fracture preventing capacity is solved. The die steel comprises, by weight, 0.68%-0.78% of C, 0.75%-0.85% of Si, 0.8%-1.0% of Mn, less than 0.015% of P, less than 0.015% of S, 2.2%-2.5% of Cr, 0.40%-0.60% of Mo, 0.40%-0.50% of V, 0.30%-0.40% of Ni, and the balance Fe. Compared with the prior art, the die steel is advantageous in that the content of C, Cr, Mo, V, P and S is reduced, the content of Si is increased, the content of Ni is controlled, and thus the structure segregation condition of the steel is greatly relieved, and the bending resistance, fracture preventing capacity and other performance indexes of the high-strength and high-toughness cold work die steel are improved.
Description
Technical field
The present invention relates to cold-punching mold material technology, refer in particular to the tough die steel of a kind of high bending strength and manufacture method thereof.
Background technology
Cold-punching mold is used for the operations such as the blanking lotus of metal or non-metallic material, impact forging, bending, cold-heading, and target is in room temperature state, and mold work condition is quite severe.Usually the cold-punched die steel selected requires enough intensity, toughness, resistance to bend and fastness to wear.For cold extrusion and the cold upsetting forming die of large load, require that material has higher bending resistance and anti-fracture ability.
At present, the cold working die steel material that domestic and international moulding stock market is most widely used is that (composition quality percentage ratio is high carbon and chromium cold-work die steel 1.2379 steel: C:1.5 ~ 1.6%, Si:0.10 ~ 0.40%, Mn:0.15 ~ 0.45%, Cr:11.0 ~ 12.0%, Mo:0.60 ~ 0.80%, V:0.90 ~ 1.10%, P0.030%, S0.030%, surplus is Fe), belong to Ledeburitic steel, there is higher hardening capacity, hardenability, wear resistance, can as the cold-punching mold of universal cold-punching mold steel for the manufacture of various uses, such as complex-shaped punching concave die, cold extruding die, roll threading is taken turns, cold shears cutting knife and precision measuringtoll etc.But the Cr content in the alloying element composition in this universal cold working die steel material reaches Cr:11.0 ~ 12.0%, and too much chromium constituent content can make to exist in material microstructure netted ledeburite carbide, causes the toughness of material not high.
The performance index of 1.2379 steel are: after 1030 DEG C of quenchings, 180 DEG C of tempering, impelling strength is 77J/cm
2, hardness is 61.5HRC, bending strength is 2700MP.And these performance index are key technical index of cold-punched die steel.
As mentioned above, cold-punching mold is mainly used in the cold-forming of metal or non-metallic material, comprises cold stamping, cold extrusion and cold-heading etc.This kind of cold-punching mold working load is large, dimensional precision, surface quality requirements are high.Usually the cold-punched die steel selected requires enough bending strengths, toughness, hardness.And 1.2379 steel are owing to containing uneven ledeburite carbide in tissue, although have higher hardness and wear resisting property after Q-tempering, toughness is lower, bending strength is poor, therefore easily bursts apart and subsides in actual use.
Above-mentioned 1.2379 steel adopt arc melting, and be cast into steel ingot hammer cogging, concrete steps are followed successively by steel-making, forging, thermal treatment, finally form product.The Heating temperature of its forging is 1100 DEG C-1140 DEG C, and final forging temperature is >=880 DEG C, and the type of cooling adopts high temperature annealing, cheats cold or sand cooling.Because 1.2379 steel form the eutectic carbides in continuous net-shaped distribution thick in a large number.This netted eutectic carbides seriously isolates matrix, and also can be used as formation of crack when die steel ruptures and crack propagation approach, thus make the crystal boundary serious embrittlement of die steel, toughness is very low.And when forging, owing to being subject to the restriction of forging ratio, for large size strand, the eutectic carbides in its heart portion is difficult to smash, so often there is Cold Roll segregation in die steel tissue after forging, the performance of die steel is made to occur anisotropy and cause forging crack.
The open file of the moulding stock be associated with this present invention and metallurgical manufacturing technology thereof is as follows:
1, CN101182619A (high-strength toughness cold working die steel and manufacture method thereof), its Chemical Composition weight percent content is: C:0.9 ~ 1.0%, Si:1.0%, Mn:0.5 ~ 0.8%, P < 0.02%, S < 0.02%, Cr:9 ~ 10%, Cu:0.8 ~ 1.0%, Mo:2.0%, V:0.8 ~ 1.0%, surplus is Fe.Carbon content wherein, chromium content, molybdenum content, content of vanadium or higher, and chromium element is the one of the main reasons causing carbide ununiformity, the webbed carbide of easy shape, reduces the toughness of material.
2, CN101250667 (general cold work tool steel), its Chemical Composition weight percent content is: C:0.9 ~ 1.1%, Si:0.7 ~ 1.3%, Mn:0.3 ~ 1.0%, P < 0.03%, S < 0.03%, Cr:4.0 ~ 5.5%, Cu:Mo:0.52 ~ 1.0%, V:0.75 ~ 1.20%, W:1.0 ~ 1.9, surplus is Fe.The chemical element design that its chemical composition contrasts traditional cold-working steel suitably reduces the content of Cr, but higher, and it adds W elements to improve the performance of steel, C content or higher, bending resistance and anti-fracture ability undesirable.
Summary of the invention
The object of the invention is to solve prior art Problems existing, providing that to have hardening capacity good, quenching temperature is lower, and heat treatment deformation is little, and cost of alloy is low and have the tough die steel of high bending strength of good intensity and toughness.
Another object of the present invention is to provide the manufacture method of the tough die steel of a kind of high bending strength as above.
The object of the invention is to be achieved through the following technical solutions:
The tough die steel of a kind of high bending strength, the chemical element that wherein said die steel comprises and composition by weight percent thereof are:
C is 0.68 ~ 0.78%, Si be 0.75 ~ 0.85%, Mn is 0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr are 2.2 ~ 2.5%, Mo is 0.40 ~ 0.60%, V is 0.40 ~ 0.50, Ni is 0.30 ~ 0.40%, and surplus is Fe.
Another object of the present invention is achieved through the following technical solutions:
A manufacture method for the tough die steel of high bending strength, is characterized in that comprising:
S1, being equipped with steel-making material: C according to the weight percent of following chemical element composition is 0.68 ~ 0.78%, Si is 0.75 ~ 0.85%, Mn is 0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr is 2.2 ~ 2.5%, Mo be 0.40 ~ 0.60%, V is 0.40 ~ 0.50, Ni is 0.30 ~ 0.40%, and surplus is Fe;
S2, adds described steel-making material in induction furnace together and is smelted into molten steel;
S3, is cast into steel ingot by described molten steel;
S4, is positioned in electroslag remelting device using described steel ingot as consumable electrode, carries out esr, in the water mold of the liquid metal after remelting below the slag blanket of slag bath falls to, is more again frozen into steel ingot;
S5, is incubated a few hours by after the described Heating Steel Ingots again solidified, and carries out forging processing, makes the tough die steel of high bending strength.
In described step S4, the steel ingot be again frozen into is 0.5-1.0t.
In described step S5, the steel ingot again solidified carries out forging processing in footpath forging machine process furnace.
The described steel ingot again solidified is heated to 1180 ~ 1200 DEG C of temperature with the heat-up rate of 80 DEG C/h ~ 110 DEG C/h in footpath forging machine process furnace, and carries out forging after being incubated 1.5 ~ 2.5 hours and process.
The initial forging temperature of described forging processing is 1030 ~ 1080 DEG C, final forging temperature >=880 DEG C.
Beneficial effect of the present invention:
The comparison of ingredients table of the present invention and prior art CN101182619A and CN101250667 is:
Surplus is Fe.
According to the contrast of comparison of ingredients table, be analyzed as follows:
As can be seen from the contrast of composition, carbon content in the constituent content of Chemical Composition of the present invention, chromium content, molybdenum content, content of vanadium geometric ratio CN101182619A are lower, add a small amount of nickel element simultaneously, they are also just different to the mechanism of the performance effect of material, and the performance characteristics of material is also different.The Chemical Composition composition of CN101182619A is compared with Chemical Composition of the present invention, it contains higher chromium element and molybdenum, v element, and chromium element is the one of the main reasons causing carbide ununiformity, the webbed carbide of easy shape, reduces the toughness of material.And contain lower chromium content in Chemical Composition composition of the present invention and add a small amount of Ni content to replace Mo and V.The intensity that Ni is improving steel can keep good plasticity and toughness simultaneously.Mo and V forms the Second Phase Precipitation thing of disperse in steel, and the precipitate of these disperses can not only play precipitation strength effect, and can effectively hinder growing up of austenite crystal, improves the obdurability of material.
In the chemical composition design of CN101250667, it contrasts the chemical element design of traditional cold-working steel, suitably reduce the content of Cr (but compared with the present invention, or high), and add W elements to improve the performance of steel, and the present invention is the matrix strength adopting Ni element strengthening steel, reduce the content of C content and alloying element, reduce manufacturing cost, improve microstructure, improve the performance index of steel.
The present invention is compared with prior art in sum, has following advantage:
1, the proportioning of chemical composition is more reasonable, reduces the content of carbon and chromium element, the microstructure segregation situation of steel is very significantly improved.Thus the performance index such as bending strength, carbide network of high-strength toughness cold working die steel are improved; Molybdenum in die steel of the present invention all decreases compared with 1.2379 steel with vanadium, this is because C content is wherein lower than 1.2379 steel.The C consumed in matrix makes the C content in martensite reduce by too much molybdenum and vanadium, thus reduces the intensity of material.Therefore the molybdenum of this die steel and vanadium control in certain scope, make existing more proeutectoid carbide disperse educt in tissue, and make to keep enough intensity in martensite; Silicone content in suitable raising steel can stop the decomposition in the drawing process of steel after martensitic transformation further, to improving steel bending strength after quenching and impact property value has certain effect; The content controlling nickel element can prevent the generation of fragility and the generation of intermetallic compound at certain low value, improves the performance of steel; The content reducing p and s can make molten steel purer, and the non-metallic inclusion reducing steel forms trend, reduces the modified temper brittleness of steel.
2. because this die steel is compared with 1.2379 steel, alloying element content is low, reduces manufacturing cost, and the distribution of carbide in the microstructure of this die steel and the rank of character carbide network all have greatly improved.Therefore under equal forging ratio condition, this die steel more can make dendroid carbide morphology in the tissue of as cast condition obtain better fragmentation than 1.2379, the microstructure of refinement steel, improves the performance of steel.
3. present invention employs rational chemical composition proportioning and advanced manufacturing process, the performance index of this die steel are obviously promoted, 1.2379 traditional steel are after 1030 DEG C of quenchings, 200 DEG C of tempering heat treatment, and bending strength is 2700MP, impelling strength is 77J/cm
2, and this die steel is after 930 DEG C of quenchings, 180 DEG C of tempering heat treatment, bending strength reaches 3350MP, and impelling strength is 140J/cm
2, bending strength improves 24%, and its impelling strength improves 82%.
For further illustrating above-mentioned purpose of the present invention, constructional feature and effect, below with reference to accompanying drawing, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the schema of the manufacture method of the tough die steel of high bending strength of the present invention.
Embodiment
Accompanying drawing below in conjunction with embodiment is described in detail to the specific embodiment of the present invention.
The chemical element that the tough die steel of high bending strength provided by the invention comprises and composition by weight percent thereof are:
C:0.68 ~ 0.78%, Si:0.75 ~ 0.85%, Mn:0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr:2.2 ~ 2.5%, Mo:0.40 ~ 0.60%, V:0.40 ~ 0.50, Ni:0.30 ~ 0.40%, surplus is Fe.
Below the effect of principal element of the present invention and restriction thereof are described:
C：0.68～0.78％
Carbon is one of main chemical elements of high-strength toughness cold working die steel, it is the indispensable fundamental element forming the various carbide such as vanadium carbide, molybdenum carbide and chromium carbide, also be the important element affecting the component segregation of steel and the homogeneity of structure of steel, be dissolved in martensite and can ensure that martensite has good intensity and hardening capacity.In steel, carbon content increases, and yield-point and tensile strength raise, but plasticity and impact reduce.In addition, carbon can increase cold shortness and the aging sensitivity of steel.This die steel composition is compared with D2 steel, and carbon content has larger reduction, its objective is distribution and the character of the carbide improved in the microstructure of steel, improves the rank of the carbide network of steel.Lower carbon element content can prevent steel from the process of solidifying, producing segregation tissue thus cause bending strength and the impact toughness decreased of steel.Therefore, carbon content is higher, the segregation of the formation and tissue that cause too much carbide is produced, affects the netted performance index of steel, particularly causes the bending strength of steel and impelling strength to reduce; But carbon is too low, carbon and other alloying elements can be caused to combine the equivalent generation deviation forming carbide, effectively can not form stable tiny carbide and the compound action of carbide, affect the intensity of steel and the hardenability of steel.
Si：0.75～0.85％
Silicon is dissolved in matrix can improve matrix strength, martensitic decomposition can be hindered to improve steel belt roof bolt and stablize, can play the effect of reductive agent and reductor in steelmaking process during tempering.If silicon content is more than 0.50% in steel, even if silicon alloying element.Silicon can significantly improve the elastic limit of steel, yield-point and tensile strength.Element silicon effectively can hinder martensitic decomposition in the drawing process after austenite to martensitic transformation, and this growing up and expanding ε-carbide stable region mainly by ε-carbide particle of drawing up, is delayed the transformation of ε-carbide to Fe3C.The control of the silicone content of book die steel relatively at present D2 steel slightly improves, and object stops the decomposition after martensitic transformation in drawing process further, to improving steel bending strength after quenching and impact property value has certain effect.
Mn：0.8～1.0％
Manganese is in the process of austenitizing, and major part has been added in the middle of matrix, improves the alloy content in matrix, strengthens solution strengthening effect, thus improves the intensity of matrix.But Mn has serious positive segregation tendency, can be enriched in eutectic cell grain boundaries and form intergranular carbide, can reduce the toughness of material.This die steel slightly improves relative to the Mn content of 1.2379 steel, and controls in certain scope.Object is the intensity increasing matrix, and makes the stable performance of material.
Cr：2.2～2.5％
Chromium is carbide, can improve the hardening capacity of material, simultaneously cheap.But Cr is also the major cause that carbide network is formed, and affects the toughness of material, therefore the content of Cr is unsuitable too high.Containing the Cr of 11.0 ~ 12.0% in 1.2379 steel, these Cr and C define netted ledeburite carbide, carbide skewness in the crystallisation process of steel of these chromium, not only have impact on chromium element promotes hardening capacity effect at steel grade, and reduce bending strength and the notched bar impact strength index of steel.This die steel greatly reduces Cr content compared with D2 steel, the proportioning of this Cr content can not make material produce the ledeburite organization of bulk, fundamentally eliminate organize thick, the internal factor that impelling strength is low, its objective is and make materials microstructure evenly, improve the toughness of material.
Mo：0.4～0.6％；V：0.40～0.50％
Molybdenum and vanadium form the Second Phase Precipitation thing of disperse in steel, and the precipitate of these disperses can not only play precipitation strength effect, and can effectively hinder growing up of austenite crystal, improve the obdurability of material.And because the avidity of Mo and V and carbon atom is strong, in drawing process, reduce martensitic decomposition rate, improve the stability of steel.Mo with V in this die steel decreases compared with 1.2379 steel, this is because the C content in this die steel is lower than 1.2379 steel.The C consumed in matrix makes the C content in martensite reduce by too much Mo and V, thus reduces the intensity of material.Therefore Mo and V of this die steel is controlled in certain scope, make the total existing more proeutectoid carbide disperse educt of tissue, and make in martensite, to keep enough intensity, the bending strength of cold-punched die steel can be mentioned.
Ni：0.3～0.4％
Nickel can improve the intensity of steel, and keeps good plasticity and toughness.Nickel has higher corrosion resistance to soda acid, at high temperature has antirust and temperature capacity.But due to the resource that nickel is more rare, therefore other alloying element substitute steel nickel chromes should be adopted as far as possible.Nickel element in this die steel controls the scope a small amount of, nickel element itself is not carbide forming element, the effect of strengthening can not be played in the matrix of steel, but too much nickel element can cause the keying action of intermetallic compound, thus reduce the performance of steel, play a role so control nickel element in the decline of content to the performance preventing steel of steel grade.Compared with 1.2379 steel, this die steel contains the Ni of 0.3 ~ 0.4%, can be good at highly malleablized matrix.
P≤0.015wt％
Phosphorus is the harmful element in steel, increases the fragility of steel, reduces the impelling strength of steel, and therefore phosphoric controls low compared with 1.2379 steel, has certain effect to the raising of performance index value.
S≤0.015wt％
Element sulphur easily causes the deterioration of the processing characteristics of steel in certain degree, easily makes steel produce superheating phenomenon in hot worked process.Therefore control sulphur content low compared with 1.2379 steel, can steel processing characteristics and mechanical property be improved, the continuous forging machining particularly during diameter forging machine hammer cogging produce superheating phenomenon play the effect of suppression.
See Fig. 1, the manufacture method of the tough die steel of the above-mentioned high bending strength provided of the present invention comprises following steps:
S1, being equipped with steel-making material: C according to the weight percent of following chemical element composition is 0.68 ~ 0.78%, Si is 0.75 ~ 0.85%, Mn is 0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr is 2.2 ~ 2.5%, Mo be 0.40 ~ 0.60%, V is 0.40 ~ 0.50, Ni is 0.30 ~ 0.40%, and surplus is Fe;
S2, adds steel-making material in induction furnace together and is smelted into molten steel;
S3, is cast into steel ingot by molten steel;
S4, is positioned in electroslag remelting device using steel ingot as consumable electrode, carries out esr, in the water mold of the liquid metal after remelting below the slag blanket of slag bath falls to, is more again frozen into 0.5-1.0t steel ingot;
S5, above-mentioned Heating Steel Ingots to 1180 ~ 1200 of again solidifying DEG C temperature range inside holding is carried out forging processing after 1.5 ~ 2.5 hours, make the tough die steel of high bending strength, wherein, initial forging temperature is 1030 ~ 1080 DEG C, final forging temperature >=880 DEG C.
Above-mentioned processing parameter is described as follows:
Again the steel ingot solidified carries out forging processing in footpath forging machine process furnace.
Insulation 1.5 ~ 2.5 hours after steel ingot is heated to 1030 DEG C ~ 1080 DEG C with the heat-up rate of 80 DEG C/h ~ 110 DEG C/h in footpath forging machine process furnace:
The thermal stresses susceptibility of steel ingot in heat-processed is higher, easy generation stress crack, steel ingot enter footpath forging machine process furnace time temperature control at 700 DEG C ~ 800 DEG C, heat-up rate controls can prevent steel ingot from the process of heating, producing crack due to thermal stress at 80 DEG C/h ~ 110 DEG C/h, be incubated 1.5 ~ 2.5 hours afterwards being heated to 1130 ~ 1180 DEG C (forging temperature opened by footpath forging machine hammer cogging), make the temperature in the whole surface of steel ingot to heart portion can keep even, the malleable shape of steel ingot can be improved like this, prevent the tearing tendency of steel in forging process, and the microstructure index of steel can be improved, improve intensity and the toughness of steel.
Opening forging temperature through footpath forging machine hammer cogging is 1030 DEG C ~ 1080 DEG C:
Due to the austenite one phase tissue regions that die steel of the present invention is steel 1030 DEG C ~ 1080 DEG C temperature ranges, there is best high temperature thermoplasticity, be conducive to high temperature deformation processing treatment, be not easy to produce high-temperature hot processing cracking.
Footpath forging machine stops forging temperature and is >=880 DEG C:
Because steel ingot finishing temperature has important impact to steel ingot rolling quality, footpath forging machine stops forging the span of control of temperature lower than defined, be very easy to cause steel ingot to produce ingot cracking in footpath forging machine hammer cogging process, but, stopping forging temperature easily causes steel to produce structure of steel coarse-grain phenomenon after footpath forging machine hammer cogging higher than span of control, and form serious carbide network, reduce the performance of steel.
Through die steel of the present invention and 1.2379 steel, the metallographic structure after Q-tempering is compared: its martensitic matrix of die steel of the present invention is uniform-distribution with the tiny carbide particle of disperse, and such tissue guarantees that this die steel has excellent combination of strength and toughness; And the segregation that there is ledeburite carbide can be found out in the metallograph of 1.2379 steel after 1030 DEG C of quenchings, 180 DEG C of tempering, thus toughness of material is caused to decline.
Die steel of the present invention thermal treatment process be 930 DEG C quenching 180 DEG C of tempering after with 1.2379 steel after 1030 DEG C are quenched 180 DEG C of tempering, both impelling strength and bending strength compare: the bending strength of die steel of the present invention reaches 3350MP, and 1.2379 traditional steel bending strengths are only 2700MP; The impelling strength of die steel of the present invention is greatly improved than 1.2379 steel, and the impelling strength of 1.2379 steel is 77J/cm2 and the toughness of die steel of the present invention is 140J/cm
2.This is because after Q-tempering, the carbide of die steel of the present invention is all the tiny proeutectoid carbide of very disperse, can not there is the segregation situation of carbide as 1.2379 steel.The bending strength of this die steel and impelling strength are greatly improved than 1.2379 steel.
Embodiment 1
In this example, moiety and the weight percent thereof of employing cold-work die steel are as follows:
C0.73％，Si0.79％，Mn0.83％，Cr2.30％，Mo0.55％，
V0.46%, Ni0.33%, P0.013%, S0.010%, Fe surplus.
The steel ingot that the proportioning of the chemical composition of the tough die steel of high bending strength of this embodiment is cast into carry out melting in induction furnace after is positioned in electroslag remelting device as consumable electrode, carry out esr, in the water mold of liquid metal below the slag blanket of slag bath falls to, again steel ingot is frozen into again, above-mentioned solidify after steel ingot enter footpath forging machine process furnace time temperature control at 790 DEG C, heat-up rate controls at 90 DEG C/h, and be heated to 1150 DEG C of temperature range inside holding carry out after 1.5 hours forging processing, become the tough die steel of high bending strength, wherein initial forging temperature: 1050 DEG C, final forging temperature 890 DEG C.
Adopt the bending strength of the high-strength toughness cold working die steel of the present embodiment to reach 3350MP, impelling strength has brought up to 140J/cm
2.
The specific chemical composition (weight percent Wt%) of embodiment 2 ~ 6 is shown in Table 1, and process parameter control is shown in Table 2, and performance index are shown in Table 3.
Table 1
| Embodiment | C | Mn | Cr | Ni | Si | Mo | V | P | S |
| 2 | 0.69 | 0.86 | 2.30 | 0.30 | 0.79 | 0.60 | 0.44 | 0.012 | 0.013 |
| 3 | 0.68 | 0.92 | 2.20 | 0.40 | 0.85 | 0.53 | 0.53 | 0.011 | 0.009 |
| 4 | 0.78 | 1.00 | 2.50 | 0.37 | 0.76 | 0.40 | 0.40 | 0.009 | 0.012 |
| 5 | 0.70 | 0.93 | 2.48 | 0.35 | 0.75 | 0.44 | 0.50 | 0.010 | 0.010 |
| 6 | 0.72 | 0.80 | 2.41 | 0.31 | 0.83 | 0.49 | 0.47 | 0.010 | 0.011 |
Table 2
Table 3
| Embodiment | Bending strength σ bb(MP) | Notched bar impact strength Ak (J/cm 2) |
| 2 | 3370 | 146 |
| 3 | 3360 | 149 |
| 4 | 3358 | 140 |
| 5 | 3355 | 150 |
| 6 | 3353 | 152 |
Its main feature of die steel of the present invention is, in the design of chemical composition, reduces C and Cr content, and make it control in rational scope, and add the carbide forming elements such as a certain amount of Mo, V, add a small amount of Ni and Si, namely can have the cost controlling alloying element by highly malleablized matrix.Carbide morphology under cold-work die steel as cast condition is improved, then just can obtain larger deflection with less forging ratio when forging, carbide that is can be made when identical forging ratio to obtain better distribution.This die steel, by after being heated to 890 DEG C ~ 930 DEG C austenitizings, impels alloying element to dissolve in matrix in a large number, improves alloy degree, strengthens solid solution strengthening effect.Meanwhile, carrying out in double tempering process, the second phase particles of disperse educt fine uniform, by precipitation strength, improves Fracture of Material.This die steel hardening capacity is good, and quenching temperature is lower, and heat treatment deformation is little, and cost is low, has the cooperation of good bending strength and impelling strength, is applicable to manufacture accurate complicated die steel.1.2379 general type cold-punched die steel can be replaced in the larger context.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to object of the present invention is described, and be not used as limitation of the invention, as long as in essential scope of the present invention, the change of the above embodiment, modification all will be dropped in the scope of claim of the present invention.
Claims (6)
1. the tough die steel of high bending strength, is characterized in that the chemical element that described die steel comprises and composition by weight percent thereof are:
C is 0.68 ~ 0.78%, Si be 0.75 ~ 0.85%, Mn is 0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr are 2.2 ~ 2.5%, Mo is 0.40 ~ 0.60%, V is 0.40 ~ 0.50, Ni is 0.30 ~ 0.40%, and surplus is Fe.
2. a manufacture method for the tough die steel of high bending strength, is characterized in that comprising:
S1, being equipped with steel-making material: C according to the weight percent of following chemical element composition is 0.68 ~ 0.78%, Si is 0.75 ~ 0.85%, Mn is 0.8 ~ 1.0%, P<0.015%, S<0.015%, Cr is 2.2 ~ 2.5%, Mo be 0.40 ~ 0.60%, V is 0.40 ~ 0.50, Ni is 0.30 ~ 0.40%, and surplus is Fe;
S2, adds described steel-making material in induction furnace together and is smelted into molten steel;
S3, is cast into steel ingot by described molten steel;
S4, is positioned in electroslag remelting device using described steel ingot as consumable electrode, carries out esr, in the water mold of the liquid metal after remelting below the slag blanket of slag bath falls to, is more again frozen into steel ingot;
S5, is incubated a few hours by after the described Heating Steel Ingots again solidified, and carries out forging processing, makes the tough die steel of high bending strength.
3. the manufacture method of the tough die steel of high bending strength as claimed in claim 2, is characterized in that:
In described step S4, the steel ingot be again frozen into is 0.5-1.0t.
4. the manufacture method of the tough die steel of high bending strength as claimed in claim 1, is characterized in that:
In described step S5, the steel ingot again solidified carries out forging processing in footpath forging machine process furnace.
5. the manufacture method of the tough die steel of high bending strength as claimed in claim 4, is characterized in that:
The described steel ingot again solidified is heated to 1180 ~ 1200 DEG C of temperature with the heat-up rate of 80 DEG C/h ~ 110 DEG C/h in footpath forging machine process furnace, and carries out forging after being incubated 1.5 ~ 2.5 hours and process.
6. the manufacture method of the tough die steel of high bending strength as claimed in claim 5, is characterized in that:
The initial forging temperature of described forging processing is 1030 ~ 1080 DEG C, final forging temperature >=880 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106048429A (en) * | 2016-06-29 | 2016-10-26 | 苏州天朋精密元器件有限公司 | Easy-cutting high-toughness plastic die steel and preparation method thereof |
| CN107119224A (en) * | 2017-04-12 | 2017-09-01 | 滁州市东华模具制造有限公司 | A kind of preparation method of anti-cold-punching mold material |
| CN110656281A (en) * | 2018-06-29 | 2020-01-07 | 宝钢特钢有限公司 | High-hardness die steel and preparation method thereof |
| CN112322981A (en) * | 2020-11-06 | 2021-02-05 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN115505838A (en) * | 2021-06-23 | 2022-12-23 | 宝武特种冶金有限公司 | High-strength-toughness low-alloy die steel and preparation method thereof |
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| CN102560266A (en) * | 2010-12-10 | 2012-07-11 | 浪莎针织有限公司 | High-wear-resistant steel for knitting needle and manufacturing method thereof |
| CN102691005A (en) * | 2011-03-25 | 2012-09-26 | 宝山钢铁股份有限公司 | Low alloy die steel |
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| EP1355071A1 (en) * | 2002-04-15 | 2003-10-22 | Nsk Ltd | Rolling bearing for continuously variable transmission |
| CN101649419A (en) * | 2008-08-15 | 2010-02-17 | 宝山钢铁股份有限公司 | High-performance cold extrusion die steel and metallurgical manufacturing method thereof |
| CN102560266A (en) * | 2010-12-10 | 2012-07-11 | 浪莎针织有限公司 | High-wear-resistant steel for knitting needle and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048429A (en) * | 2016-06-29 | 2016-10-26 | 苏州天朋精密元器件有限公司 | Easy-cutting high-toughness plastic die steel and preparation method thereof |
| CN107119224A (en) * | 2017-04-12 | 2017-09-01 | 滁州市东华模具制造有限公司 | A kind of preparation method of anti-cold-punching mold material |
| CN110656281A (en) * | 2018-06-29 | 2020-01-07 | 宝钢特钢有限公司 | High-hardness die steel and preparation method thereof |
| CN112322981A (en) * | 2020-11-06 | 2021-02-05 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN112322981B (en) * | 2020-11-06 | 2022-03-15 | 首钢贵阳特殊钢有限责任公司 | H22 and H25 drill rod hollow steel for rock drilling |
| CN115505838A (en) * | 2021-06-23 | 2022-12-23 | 宝武特种冶金有限公司 | High-strength-toughness low-alloy die steel and preparation method thereof |
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Application publication date: 20160413 |