CN100564569C - Cold working tool steel - Google Patents
Cold working tool steel Download PDFInfo
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- CN100564569C CN100564569C CNB2006100008511A CN200610000851A CN100564569C CN 100564569 C CN100564569 C CN 100564569C CN B2006100008511 A CNB2006100008511 A CN B2006100008511A CN 200610000851 A CN200610000851 A CN 200610000851A CN 100564569 C CN100564569 C CN 100564569C
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The object of the present invention is to provide a kind of annealing back hardness low, easily implement cold working (forge, punching press) and machining (milling, boring, end mill, grind cut, rotary cut) cold working tool steel.Address the above problem, the present invention's cold working tool steel, its composition contains 0.6%≤C≤1.60% with weight %, 0.10%≤Si≤1.20%, 0.10%≤Mn≤0.60%, 5.5%≤Cr≤13.0%, 0.80%≤Mo+0.5W≤2.10%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.008%, 0.001≤Al≤0.10, its remnants of defeated troops are made up of Fe and inevitable impurity, transient point Ar3 is more than 750 ℃ below 850 ℃, do the spheroidizing processing of maintenance heating with (Ar3+50 ℃) above temperature below 1050 ℃ after, observe to organize section, the scope in its quite round footpath is below 0.8 μ m more than the 0.25 μ m in the average quite circle footpath of the carbide below the 3 μ m more than the 0.1 μ m, Brinell hardness (Brinell Hardness) after above-mentioned spheroidizing is handled is below the above HB235 of HB179, and the B that stipulates in JIS G0555 is that intermediary and C are in the intermediary, the cleanliness factor of steel is (dB+dC) 60 * 400≤0.05%, during K value=Cr (%)-6.8 * C (%), the K value is more than 0.1 below 3.5.
Description
Technical field
The present invention is used for cold working and forges relevant for a kind of cold working tool steel, the cold working mould of punch process or structure assembly, require the mechanical component of wear resistant, the cold forging punching die, the shaping die of high-tensile steel, bending die, the cold-working forging mold, forge mould, the screw rod spinning block, punch, the slitting shear machine cutter, the template punch die, the table meter, take out punching press deeply, the bending die punching press, shear-blade, stainless bending die, dark pumping mode, the plastic working instrument of forging etc., the gear punching press, rubber component, punching die, the sequentially-operating punching die, the sealing plate of soil stone feedway, spiral component, cement blows pays the machine swivel plate, the IC Encapsulation Moulds, the precision stamping mould that dimension precision requirement is high, the metal die of the employed such use of surface treatment of enforcement CVD processing PVD processing TD processing etc.
Background technology
Cold working tool steel always is uses such as the SKD11 of representative steel grade of high alloy cold working mould of JIS4404 or SKD12.These cold working tool steels are (to forge, prolong pressure etc.) after hot-work, heating the temperature range from wet this field temperature Ar3 point to Ar3 point+50 ℃ and slowly the refrigerative anneal as cold worked softening processing.By the resulting annealing hardness of this anneal condition for being approximately vigorous formula hardness HB241～HB255.
But the annealing hardness than known is low than known temperature height for annealing temperature 1 revealer of patent documentation again.Though softization makes machining easy, the hardness of the invention steel in the table 2 is HV262～278 (HB converts about 250～265), difficult meaning soft.And, if annealing temperature is higher and implement than quenching temperature, even the problem that has the customary quenching temper number to reduce is still not mentioned for the hardness of Q-tempering.
Invent the problem of desired solution
In recent years, require the shortening of manufacturing processed and cost to reduce all the more, attempt to shorten the Production Time of structure assembly, mechanical component, therefore require the excellent in machinability of annealed material and be easy to carry out the good cold working tool steel of cold worked machinability.But cold working tool steel is difficult to obtain soft by annealing on its composition.
Again, particularly the antiwear characteristic of mould or tool, mechanical component is under the purposes of necessity, from the viewpoint of its wear resistant, though the material that comprises the thick carbide of crystallization that utilizes more, pay attention to wear resistant, but can't avoid the deterioration of the material behavior of toughness reduction.On the other hand, desire to be raised machinability, that then add to reduce the thick carbide of crystallization or the S of volume etc. cuts element soon, but can cause wear resistant to reduce.In this, the thick carbide (primary carbide) of crystallization refers to the quite above object of the about 10 μ m in circle footpath.
In view of this, the object of the present invention is to provide a kind of annealing back hardness low, easily implement cold working (forge, punching press) and machining (milling, boring, end mill, grind cut, rotary cut) cold working tool steel.The means of dealing with problems, the effect of invention
For addressing the above problem, the described cold working tool steel of claim 1 of the present invention, its composition contains 0.6%≤C≤1.60% with weight %, 0.10%≤Si≤1.20%, 0.10%≤Mn≤0.60%, 5.5%≤Cr≤13.0%, 0.80%≤Mo+0.5W≤2.10%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.008%, 0.001%≤Al≤0.10%, its remnants of defeated troops are made up of Fe and inevitable impurity, transient point Ar3 is more than 750 ℃ below 850 ℃, do the spheroidizing processing of maintenance heating with (Ar3+50 ℃) above temperature below 1050 ℃ after, observe to organize section, the scope in its quite round footpath is below 0.8 μ m more than the 0.25 μ m in the average quite circle footpath of the carbide below the 3 μ m more than the 0.1 μ m, Brinell hardness (Brinell Hardness) after above-mentioned spheroidizing is handled is below the above HB235 of HB179, and the B that stipulates in JIS G0555 is that intermediary and C are in the intermediary, the cleanliness factor of steel is (dB+dC) 60 * 400≤0.05%, during K value=Cr (%)-6.8 * C (%), the K value is more than 0.1 below 3.5.
The invention described above mainly contains following feature.
(1) hardness after the annealing reduces
Annealing back hardness determined by the suitable circle footpath scope distribution by the carbide (hereinafter referred to as proeutectoid carbide) below the 3 μ m more than the 0.1 μ m, because the average quite circle of this proeutectoid carbide directly below 0.8 μ m more than the 0.2 μ m, shows soft.On average the scope in quite round footpath is greater than the size of proeutectoid carbide.That is, because the absolute magnitude of the proeutectoid carbide that annealing is produced is identical, if on average quite round footpath becomes big, bigger proeutectoid carbide existence and makes the hardness reduction.On the contrary, if average quite circle footpath diminishes, smaller proeutectoid carbide is intensive, makes hardness become big.Particularly, quite justify directly in last scope by the average of proeutectoid carbide, (conventional materials is that Brinell hardness HB241～HB255), machining and cold worked efficient can promote especially can to obtain Brinell hardness HB179 is above and HB235 is following soft.
(2) size of proeutectoid carbide is controlled by annealing conditions
The size of proeutectoid carbide is done the spheroidizing that keeps heating by (Ar3+50 ℃) above temperature below 1050 ℃ and is handled and control.In detail, at first, heating remains in the temperature higher than known annealing temperature (Ar3～Ar3+50 ℃) (Ar3+50 ℃～quenching temperature (1050 ℃)) makes its solid solution in the mother metal that proeutectoid carbide is Duoed.And the temperature that heating keeps is lower than quenching temperature (1050 ℃), and the hardness behind the Q-tempering is reduced.Afterwards, the proeutectoid carbide of solid solution becomes big and grows up, with the speed of cooling slow cooling 750 ℃ below (slow cooling method) slower than 60 ℃/h.Other treatment process is between the temperature of 650 ℃～transient point Ar1 and transient point Ar3～1050 ℃, does the above refrigerative of heating repeatedly of secondary and " heats the slow cooling method repeatedly ", does " the isothermal transforma-tion method " of doing maintenance in " the long-time heating method " of maintenance, the slow cooling way in the slow cooling method at a certain temperature etc. in the temperature lower than Ar3 for a long time.Use the size of the equal may command proeutectoid carbide of any method.Again, before above-mentioned spheroidizing was implemented, the temperature below Ar1 was implemented low-temperature annealing, lowered the hardness error after annealing, and can obtain lower hardness.And, at the thick crystallization carbide (primary carbide) of influence, handle even implement above-mentioned spheroidizing as mould or the necessary wear resistant of tool purposes, do not make its size and number produce big variation yet.
In this, A3 transient point (wet this field temperature) during transient point " Ar3 " expression cooling, " r " means cooling (refroidissement).In spheroidizing is handled, for make proeutectoid carbide fully solid solution in mother metal, make heating keep temperature, and this temperature is below quenching temperature, in the hope of enough low transient point Ar3 than known temperature height.In other words, the difference of transient point Ar3 and quenching temperature is enough big, therefore, must do the composition adjustment in order to make transient point Ar3 be 750 ℃～850 ℃, if transient point Ar3 uprises, diminish with the missionary society of general quenching temperature (1050 ℃), annealing temperature can't improve and proeutectoid carbide solid solution fully (identical with known annealing).On the other hand, if Ar3 reduces, the separating out of proeutectoid carbide, the time that growth needs is extremely long.And for annealing temperature, the device of transient point Ar3 usefulness DTA (differential Thermal Analysis) etc. is measured, and determines preferable temperature (Ar3+50 ℃～quenching temperature (1050 ℃)) by this.
(3) about of the influence of oxide based intermediary to machinability
The intermediary (according to JIS G 0555) of B system and C system (particularly oxide based), more then machinability can be lower for the amount of intermediary.These intermediaries, the hardness of self is quite high, far surpasses the hardness of mother metal.So, if when machining, contact, can make instrument blade generation fragment (chipping) and reduction life tools with the instrument blade.Because the intermediary of B system and C system heals 0 near littler to the influence of machinability, in order to obtain sufficient machinability, B system is the cleanliness factor (dB+dC) the 60 * 400≤0.05% of steel in the intermediary with C, and is necessary.And above-mentioned cleanliness factor mainly is to make the amount of O and Al in scope described later.
Below do explanation at each numerical definiteness reason of the present invention.
(4)0.6％≤C≤1.60％
C improves the necessary element of mother metal hardness when quenching.Combine and form carbide by carbide forming element, make the crystal grain granular with Cr, Mo, V etc.Promote wear resistant by carbide again.In order to make Q-tempering hardness more than HRC55, must be added into more than the lower limit.On the other hand, the over-drastic interpolation can make carbide become many and cause wilful the reduction, therefore is added into below the upper limit.
(5)0.10％≤Si≤1.20％
Add Si as deoxidant element.Again, hardness is improved, wish to get this effect and add more than the lower limit owing to implementing high tempering.On the other hand, the over-drastic interpolation can make hot workability reduce, and the toughness behind the Q-tempering is reduced, and therefore is added into below the upper limit.
(6)0.10％≤Mn≤0.60％
Add Mn as deoxidant element.Again, hardenability improves, and for hardness being improved and the intensity raising, is added into more than 0.10%.Because the over-drastic interpolation can make hot workability reduce, be limited to 0.6% on it on the other hand.
(7)5.5％≤Cr≤13.0％
Cr improves the hardenability of solid solution in mother metal, improves simultaneously in hardness, forms carbide and the wear resistant lifting.In order to obtain this effect, must be added into more than the lower limit.On the other hand, over-drastic adds system and forms and surpass necessary carbide, in order to reduce toughness, the machinability behind the Q-tempering, is added into below the upper limit.
(8)0.80％≤Mo+0.5W≤2.10％
Mo and W improve the hardenability of solid solution in mother metal, improve simultaneously in hardness, form carbide and the wear resistant lifting.Again, also have the softening resistivity that improves Q-tempering effect.In order to obtain this effect, the Mo equivalent that Mo (%)+0.5W (%) is put down in writing must be added into more than the lower limit.On the other hand, the over-drastic interpolation can make hot workability, toughness, machinability reduce, and therefore adds below the upper limit.
(9)0.10％≤V≤0.40％
V has the result who forms stable carbide and prevent overgrowth of crystals.Form fine carbide and promote wear resistance and hardness again.In order to obtain so effect, must be added into more than 0.10%.On the other hand, the over-drastic interpolation can make the carbide amount increase and reduce machinability and hot workability, is limited to 0.40% on therefore.
(10)0.0002％≤O≤0.0080％、0.001％≤Al≤0.10％
O and Al can't be contained in the steel with avoiding.The formation element of the intermediary of B system and C system then reduces toughness if contain volume in the steel, must be added into below the upper limit.Again, hold concurrently to consider manufacturing cost and reduce these elements energetically, can keep stable and high tenacity.And, even excessively reduce, only can cause the rising of manufacturing cost, and saturated to the flexible influence, therefore be added into more than the lower limit.
(11) transient point Ar3 is more than 750 ℃ below 850 ℃
When transient point Ar3 is in this scope,, guarantee to make the temperature of the abundant solid solution of proeutectoid carbide owing to become big from Ar3+50 ℃ of scope implementing the spheroidizing processing to 1050 ℃ of quenching temperatures.But, excessive when high as Ar3, narrow down from Ar3+50 ℃ of scope to 1050 ℃ of quenching temperatures, can't guarantee annealing temperature.As a result, the solid solution capacity of proeutectoid carbide diminishes, and the necessary soft of machinability can't get a promotion.Again, if Ar3 is excessively low, the overlong time that slow cooling makes proeutectoid carbide export to the west, grow up to the temperature below the Ar3, and make industrial cost very high.And though the mensuration of Ar3 is to carry out with DTA etc., the temperature of Ar3 is to be changed by condition determination, speed of cooling be 5 ℃/more than the h, do mensuration at 60 ℃/h.
(12) the quite circle footpath scope that section observes organized after spheroidizing is handled directly is more than the 0.25 μ m below the 0.8 μ m at the average quite circle of the carbide below the 3 μ m more than the 0.1 μ m.
The average quite circle of carbide directly on the lapped face of steel to organizing section to do that video recording analysis calculates.Particularly, when doing the amplification observation with scanning type electron microscope or opticmicroscope, the quite circle footpath that is present in the visual field is that the carbide below the 3 μ m is all more than the 0.1 μ m, calculates its quite round footpath respectively, obtains mean value then as on average quite directly round.Amplify to observe system except material surface and central part, on optional position, 1mm at least
2Above area, or in a visual field, belong to the following carbide of the above 3 μ m of quite round footpath 0.1 μ m and have 20 to 500, this visual field can be used for the mensuration more than 20 visuals field.0.1 the following carbide of the above 3 μ m of μ m promptly forms the carbide (proeutectoid carbide) of hardness.If, can't obtaining hardness less than 0.25 μ m, the median size of this carbide improves, and the effect (situation that is equivalent to the anneal of known enforcement) of machinability raising.On the other hand, when excessive, the number of the carbide of growing up during owing to the annealed slow cooling is few, is difficult for separating out ripple and comes iron in process of cooling, and hardness is uprised, so the average quite circle footpath of carbide must be its upper limit with 0.8 μ m.
(13) Brinell hardness was below the above HB235 of HB179 after spheroidizing was handled
Because after spheroidizing was handled, Brinell hardness was below the HB235, can obtain than known good machinability and cold-workability.On the other hand, when excessively low, owing to can improve industrial cost, with preferable more than the HB179.
(14) B of JIS G 0555 defined is that intermediary and C are in the intermediary, and firm cleanliness factor is (dB+dC) 60 * 400≤0.05%
B is that intermediary means that making discontinuously granulous intermediary (mainly being aluminium) the accumulative material of arranging, C on machine direction is that intermediary is meant not make and produces the viscous deformation and irregular dispersive object (granular oxide).Because these intermediaries too much can make machinability reduce, it is the cleanliness factor (dB+dC) 60 * 400≤0.05% of the steel of intermediary that the test method of JIS G 0555 defined decides B system and C, can obtain good machinability.
(15) during K value=Cr (%)-6.8 * C (%), this K value is more than 0.1 below 3.5
The K value representation when suitable quenching temperature solid solution in the Cr of mother metal amount.In above-mentioned scope, approximately equal by the hardness of Q-tempering gained, can be corresponding to the desired wear resistant of cold working tool steel or toughness, machinability and adjust crystallization carbide amount.But, if the K value beyond above-mentioned scope, owing to the amount of separating out the proeutectoid carbide that produces hardness in the tempering is not enough, can't be kept the hardness of cold working tool steel.In the 1st figure, the relation of the amount of expression C and the amount of Cr.Relevant with the K value from the paper lower-left towards upper right straight line, relevant from the upper left straight line of paper with the L value of back number towards the bottom right.
The present invention's cold working tool steel again, its composition of steel more can contain 0.0030%≤N≤0.0500%, 0.001%≤P≤0.040% wherein one or both.
These elements are in steel institute inevitably.Because the many toughness that can make of content reduce in steel, therefore are preferably in below the upper limit.。Again, hold concurrently to consider manufacturing cost and reduce these elements energetically, can keep stable and high tenacity.And, even excessively reduce, only can cause the rising of manufacturing cost, and saturated to the flexible influence, therefore be added into more than the lower limit.
The present invention's cold working tool steel again, its composition of steel more can comprise 0.01%≤Cu≤1.0%, 0.01%≤Ni≤1.0%, 0.2%≤Co≤1.0%, 0.0003%≤B≤0.010% wherein one or more.
These elements have solid solution in mother metal and promote the effect of hardenability.About toughness, impact the reduction of migration temperature and toughness is promoted by making, and reach the result who prevents the weldability deterioration by this.Again, about Co, it has the effect that improves hot strength.In order to obtain these effects, it is above preferable to be added into lower limit.On the other hand, the over-drastic interpolation can make effect reach capacity, and it is following preferable therefore to be added into the upper limit.
The present invention's cold working tool steel again, the composition of its steel more comprises: 0.001%≤S≤0.20%, 0.005%≤Se≤0.10%, 0.005%≤Te≤0.10%, 0.0002%≤Ca≤0.010%, 0.005%≤Pb≤0.10%, 0.005%≤Bi≤0.10% wherein one or more.
S can add as cutting element fast.Though can merge with the carbide forming element of Cr, Mo, V etc.,, preferably be added into more than 0.04% in order to obtain the effect that machinability promotes.The over-drastic interpolation can make the mechanical characteristic of the surface roughness deterioration after toughness reduction or electrodischarge machining(E.D.M.), the machining etc. also reduce greatly, so the upper limit preferably 0.20%.So, in paying attention to the purposes of machinability, consider the balance of mechanical characteristics and add.On the one hand, mechanical characteristics is considered the balance of manufacturing cost than in the valued purposes of machinability, and the S addition is below 0.02%, and is better below 0.01%.Can satisfy mechanical characteristics below 0.02% more than 0.001% in the actually operating.Obtain above-mentioned S addition by above.
About Se, Te, Ca, Pb, Bi, can add for the purpose that promotes machinability.Se, Te can be utilized as the substitute element of S in the Mn sulfide.Ca, forms protective membrane and machinability is improved in tool surfaces when machining in Mn sulfide by the formation of oxide compound or solid solution.Pb, Bi meeting segregation reduces and the raising machinability grain-boundary strength for crystal boundary.In order to obtain these effects, must be added into more than the lower limit.On the other hand, the over-drastic interpolation can cause mechanical characteristics to worsen, and therefore is added into below the upper limit.
Again, the present invention's cold working tool steel, the composition of steel more can comprise: 0.01%≤Nb≤0.12%, 0.005%≤Ta≤0.10%, 0.005%≤Ti≤0.10%, 0.005%≤Zr≤0.10%, 0.005%≤Mg≤0.10%, 0.005%≤REM≤0.10% wherein one or more.
These elements can add to obtain carbide granular or crystal grain granular and improve the flexible result.Again, Mg and REM form oxide compound.Produce suboxide and reduce thick oxide compound.On the other hand, the over-drastic interpolation can make toughness and weldability reduce, and preferably is added into below the upper limit.And, in REM, can use one or more rare earth element.
Then, the present invention can be further defined to the composition of steel in the above-mentioned technical solution 0.60%≤C≤0.80%, 0.10%≤Si≤1.20%, 0.10%≤Mn≤0.60%, 5.5%≤Cr≤8.5%, 0.80%≤Mo+0.5W≤2.10%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.0080%, 0.001%≤Al≤0.10%.That is, in the steel constitution of technical solution of the present invention, add further restricted condition C, Si, Cr, Mo.
Cold working tool steel particularly needs the mould of toughness and microfabrication, must reduce the crystallization carbide.Promptly, needn't do one's utmost to form with M by C, Si, Cr, Mo are adjusted in the above-mentioned scope
7C
3Crystallization carbide (M is Cr, Mo, V) for main body.The amount of crystallization carbide is equivalent to weight %0.01～5%.Again, the index of the amount of expression crystallization carbide when L value=Cr (%)+15.5 * C (%), is equivalent to 1.49≤L value≤21.0.(with reference to the 1st figure)
Then, the present invention can be 0.90%≤C≤1.10%, 0.8%≤Si≤1.20%, 0.10%≤Mn≤0.60%, 7.0%≤Cr≤9.0%, 1.50%≤Mo+0.5W≤2.10%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.0080%, 0.001%≤Al≤0.10% with the composition of steel in the above-mentioned technical solution.Promptly in the steel constitution of technical solution of the present invention, add further restricted condition C, Si, Cr, Mo.
Cold working tool steel particularly needs wear resistant and flexible equilibrated mould, must guarantee the amount of crystallization carbide in certain degree.Promptly, form with M by C, Si, Cr, Mo are adjusted in the above-mentioned scope
7C
3Crystallization carbide for main body.The amount of crystallization carbide is equivalent to weight %5～10%.21.0≤L value≤27.0 again.(with reference to the 1st figure)
Then, the present invention can be 1.40%≤C≤1.60%, 0.10%≤Si≤0.40%, 0.10%≤Mn≤0.60%, 11.0%≤Cr≤13.0%, 0.80%≤Mo+0.5W≤1.20%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.0080%, 0.001%≤Al≤0.10% with the composition of steel in the above-mentioned technical solution.Promptly in the steel constitution of technical solution of the present invention, add further restricted condition C, Si, Cr, Mo.
Cold working tool steel particularly needs wear resistant and flexible balance mould, must contain the crystallization carbide more.Promptly by C, Si, Cr, Mo are adjusted in the above-mentioned scope, multiform becomes with M
7C
3Crystallization carbide for main body.The amount of crystallization carbide is equivalent to weight %10～15%.27.0≤L value≤37.8 again.(with reference to the 1st figure)
Description of drawings
The 1st figure is the figure of the relation (K value, L value) of C amount and Cr amount.
The preferred form that is used to carry out an invention
The steel of the 200kg that the represented steel of the present invention of table 1 and the composition of steel are relatively formed after the fusion of high frequency vacuum dissolving stove, are made bulk, resulting bloom is done hot-work forge and form the angle rod of 70mm on one side.Afterwards, do anneal (18 ℃ of slow cooling speed/h) with the temperature shown in the table 2.
And, in the composition of the comparison steel in table 1, when breaking away from compositing range given to this invention, surpass lower limit and give downward arrow, surpass the arrow that the upper limit then makes progress.
For steel of the present invention and comparison steel, carry out following test and evaluation.Its result is shown in table 2.
(a) evaluation of measuring of carbide
Lapped face to material carries out video recording analysis, and measures the median size of carbide.Video recording analysis system uses SEM to observe photo to carry out, and with suitable multiplying power in 500～5000, observes the area of 1mm2.Then, all for the carbide below the 3.0 μ m more than the 0.1 μ m that is present in the demonstration visual field, calculate respectively quite to justify and directly obtain mean value.And lapped face is etched to the observable degree of depth under the situation that the carbide about 0.1 μ m can not be peeled off with picric acid (Pikrin) ethanolic soln.
(b) B system and C are the intermediary amount
The determination of test method (dB+dC) 60 * 400 of JIS G 0555 defined.
(c) machinability test
Test film from the steel of the present invention and the comparative steel of manufacturing cuts out carries out the test of machinability under following condition.
End mill processing experiment condition
Instrument: superhard solid end mill
10mm), 6 blades
Speed: 120m/min
The amount of feed: 0.06mm/rev
The high 10mm of width of cut: 0.5mm
Machining oil: air blowing chip removal
Cutting distance: be cut to 60000mm
Judge: in the cutting way, no instrument is lost and is judged to be zero, lose or produce spark midway then to be judged to be *.
(d) cold working processibility
The test film that cuts out 12 * 18mm from the steel of the present invention and the comparison steel of manufacturing is done an air pressure with the 600t hydraulic press and is contracted and be machined to 60% of test film height.In each steel, observe the test film after 10 processing, check which generation breaks.
(e) maximum hardness
Change the heat-treat condition of Q-tempering, do mensuration with Rockwell (Rockwell) sclerometer.
(f) compare wear loss
Test with pin-on-disc friction wear test machine.Cut out two diameters from the steel of making of the present invention with the comparison steel
The pin of 8mm.Disc (disc) cuts out from S45C.Steel of the present invention and comparative steel are together carried out Q-tempering to obtain maximum hardness.Test conditions is sliding velocity 1.6m/s, sliding distance 5000m, ballast 10.5kgf, unlubricated oil.The weight of pin before and after the determination test, and measure abrasion weight.Relatively the abrasion weight of steel 1 is 1 o'clock, with other the abrasion weight of steel of the present invention and comparative steel as than wear loss.
(g) hammer impact value
Cut out 10R notch-Charpy testing plate from steel of the present invention and the comparison steel made.With the length direction of material as the length direction of Charpy test film and marshalling.Thermal treatment system implements according to the mode that JIS Z 2242 is put down in writing.And test is at room temperature to carry out.
Table 2
| No. | The Ar3 temperature (℃) | Median size (μ m) | Intermediary dB+dC | Annealing temperature | Hardness behind the SA (HB) | Maximum hardness (HRC) | The cold-working processibility | Machinability | Compare wear loss | Charpy impact (J/cm2) | |
| 1 | Comparative steel | ↓740 | ↓0.21 | 0.005 | ↓750 | ↑269 | 60.3 | * 8 | × | 1 | 53 |
| 2 | The invention steel | 793 | 0.71 | 0.002 | 980 | 204 | 63.2 | ○ | ○ | 0.32 | 21 |
| 3 | Comparative steel | ↓733 | ↑1.53 | ↑0.41 | ↑1140 | ↓170 | 60.4 | ○ | × | 1.03 | 46 |
| 4 | Comparative steel | 831 | 0.53 | 0.003 | 950 | 204 | 54.3 | ○ | ○ | 5.93 | 53 |
| 5 | The invention steel | 805 | 0.45 | 0.001 | 970 | 212 | 61.3 | ○ | ○ | 0.92 | 63 |
| 6 | The invention steel | 822 | 0.58 | 0.034 | 1020 | 208 | 63.3 | ○ | ○ | 0.93 | 68 |
| 7 | The invention steel | 803 | 0.38 | 0.027 | 960 | 198 | 63.5 | ○ | ○ | 0.89 | 73 |
| 8 | The invention steel | 755 | 0.35 | 0.046 | 960 | 199 | 62.9 | ○ | ○ | 0.93 | 58 |
| 9 | The invention steel | 790 | 0.26 | 0.003 | 970 | 203 | 64.2 | ○ | ○ | 0.89 | 66 |
| 10 | The invention steel | 809 | 0.44 | 0.002 | 970 | 203 | 63.8 | ○ | ○ | 0.88 | 67 |
| 11 | The invention steel | 833 | 0.58 | 0.011 | 990 | 185 | 62.8 | ○ | ○ | 0.84 | 93 |
| 12 | The invention steel | 813 | 0.65 | 0.001 | 1030 | 204 | 62.7 | ○ | ○ | 0.93 | 81 |
| 13 | The invention steel | 836 | 0.28 | 0.006 | 1030 | 233 | 62.9 | ○ | ○ | 0.99 | 88 |
| 14 | Comparative steel | ↑876 | 0.39 | ↑0.39 | 970 | 226 | 51.1 | ○ | × | 6.33 | 67 |
| 15 | Comparative steel | 843 | 0.67 | 0.008 | 950 | 193 | 53.2 | ○ | ○ | 6.29 | 93 |
| 16 | The invention steel | 848 | 0.52 | 0.003 | 990 | 198 | 62.5 | ○ | ○ | 0.63 | 43 |
| 17 | The invention steel | 845 | 0.78 | 0.048 | 990 | 183 | 64.3 | ○ | ○ | 0.55 | 44 |
| 18 | The invention steel | 833 | 0.47 | 0.036 | 990 | 195 | 64.1 | ○ | ○ | 0.59 | 48 |
| 19 | The invention steel | 828 | 0.36 | 0.021 | 930 | 199 | 64.8 | ○ | ○ | 0.63 | 53 |
| 20 | The invention steel | 773 | 0.31 | 0.012 | 840 | 225 | 63.8 | ○ | ○ | 0.73 | 41 |
| 21 | The invention steel | 819 | 0.63 | 0.001 | 930 | 203 | 63.7 | ○ | ○ | 0.72 | 39 |
| 22 | The invention steel | 835 | 0.65 | 0.003 | 980 | 211 | 63.2 | ○ | ○ | 0.72 | 46 |
| 23 | The invention steel | 832 | 0.71 | 0.007 | 890 | 191 | 62.8 | ○ | ○ | 0.73 | 52 |
| 24 | The invention steel | 825 | 0.68 | 0.001 | 930 | 200 | 62.7 | ○ | ○ | 0.72 | 37 |
| 25 | Comparative steel | ↑883 | ↓0.11 | 0.002 | ↓900 | ↑266 | 48.7 | * 10 | × | 3.14 | 11 |
| 26 | Comparative steel | 817 | 0.73 | 0.004 | 980 | 213 | 51.3 | ○ | ○ | 3.82 | 13 |
| 27 | The invention steel | 795 | 0.71 | 0.002 | 890 | 200 | 62.7 | ○ | ○ | 0.32 | 19 |
| 28 | The invention steel | 808 | 0.68 | 0.043 | 1000 | 201 | 63.3 | ○ | ○ | 0.31 | 23 |
| 29 | The invention steel | 813 | 0.57 | 0.007 | 1000 | 205 | 63.2 | ○ | ○ | 0.46 | 22 |
| 30 | The invention steel | 803 | 0.55 | 0.011 | 940 | 209 | 64.7 | ○ | ○ | 0.49 | 28 |
| 31 | The invention steel | 755 | 0.49 | 0.028 | 920 | 205 | 62.1 | ○ | ○ | 0.28 | 27 |
| 32 | The invention steel | 761 | 0.68 | 0.032 | 990 | 217 | 61.8 | ○ | ○ | 0.38 | 17 |
| 33 | The invention steel | 783 | 0.73 | 0.003 | 910 | 218 | 63.3 | ○ | ○ | 0.37 | 19 |
| 34 | The invention steel | 796 | 0.41 | 0.006 | 870 | 231 | 63.6 | ○ | ○ | 0.31 | 20 |
| 35 | The invention steel | 807 | 0.29 | 0.007 | 860 | 223 | 64.4 | ○ | ○ | 0.45 | 29 |
The test-results represented according to table 2, relatively steel 1 since its composition outside compositing range given to this invention, the Ar3 temperature reduces.With known identical annealing conditions under when implementing thermal treatment, carbide is solid solution fully because the carbide slow cooling also can't be become greatly, the size of carbide is also little, hardness is also high.Therefore the cold-working processibility is not good, has 8 generations to break in 10 test films.Relatively steel 3 since its composition outside compositing range given to this invention, the Ar3 temperature reduces.Again, because annealing temperature is a high temperature, it is big that the size of carbide becomes, and hardness reduces and the cold-working excellent processability, owing to hardness reduces, and the ductility of material, machinability then reduces on the contrary.Steel 4 relatively, though be on the composition in compositing range given to this invention, K value is greatly and outside scope.Therefore, maximum hardness is reached more than the HRC60, can't obtain the hardness of cold working tool steel necessity with the thermal treatment of Q-tempering.Again, hardness reduces and also increases than wear loss.Comparative steel 14,15,25,26 similarly, the K value is outside scope.So, maximum hardness reduces, and increases than wear loss.
Claims (3)
1. cold working tool steel, it is characterized in that, its composition contains 0.9%≤C≤1.10% with weight %, 0.10%≤Si≤1.20%, 0.10%≤Mn≤0.60%, 5.5%≤Cr≤13.0%, 0.80%≤Mo+0.5W≤2.10%, 0.10%≤V≤0.40%, 0.0002%≤O≤0.008%, 0.001%≤Al≤0.10%, 0.0030%≤N≤0.0500%, 0.001%≤P≤0.040%, 0.01%≤Cu≤1.0%, 0.01%≤Ni≤1.0%, 0.001%≤S≤0.20%, its remnants of defeated troops are made up of Fe and inevitable impurity, transient point Ar3 is more than 750 ℃ below 850 ℃, do the spheroidizing processing of maintenance heating with (Ar3+50 ℃) above temperature below 1050 ℃ after, observe to organize section, the scope in its quite round footpath is below 0.8 μ m more than the 0.25 μ m in the average quite circle footpath of the carbide below the 3 μ m more than the 0.1 μ m, Brinell hardness (Brinell Hardness) after above-mentioned spheroidizing is handled is below the above HB235 of HB179, and the B that stipulates in JIS G0555 is that intermediary and C are in the intermediary, the cleanliness factor of steel is (dB+dC) 60 * 400≤0.05%, during K value=Cr%-6.8 * C%, the K value is more than 0.1 below 3.5, the index of the amount of expression crystallization carbide, when L value=Cr%+15.5 * C%, be equivalent to 21.0≤L value≤27.0.
2. cold working tool steel according to claim 1, wherein the composition of steel more comprises: 0.01%≤Nb≤0.12%, 0.005%≤Ta≤0.10%, 0.005%≤Ti≤0.10%, 0.005%≤Zr≤0.10%, 0.005%≤Mg≤0.10%, 0.005%≤REM≤0.10% wherein one or more.
3. cold working tool steel according to claim 1 and 2, wherein above-mentioned spheroidizing are handled after keeping heating, with below the speed of cooling slow cooling to 750 that is lower than 60 ℃/h ℃.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005007198 | 2005-01-14 | ||
| JP2005007198A JP2006193790A (en) | 2005-01-14 | 2005-01-14 | Cold working tool steel |
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| Publication Number | Publication Date |
|---|---|
| CN1811004A CN1811004A (en) | 2006-08-02 |
| CN100564569C true CN100564569C (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100008511A Expired - Fee Related CN100564569C (en) | 2005-01-14 | 2006-01-13 | Cold working tool steel |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20060157163A1 (en) |
| JP (1) | JP2006193790A (en) |
| KR (1) | KR20060083142A (en) |
| CN (1) | CN100564569C (en) |
| TW (1) | TW200624570A (en) |
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2006
- 2006-01-11 KR KR1020060003210A patent/KR20060083142A/en not_active Application Discontinuation
- 2006-01-13 CN CNB2006100008511A patent/CN100564569C/en not_active Expired - Fee Related
- 2006-01-17 US US11/332,910 patent/US20060157163A1/en not_active Abandoned
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| US4604145A (en) * | 1984-01-13 | 1986-08-05 | Sumitomo Metal Industries, Ltd. | Process for production of steel bar or steel wire having an improved spheroidal structure of cementite |
| US6053991A (en) * | 1998-01-06 | 2000-04-25 | Sanyo Special Steel Co., Ltd. | Production of cold working tool steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006193790A (en) | 2006-07-27 |
| US20060157163A1 (en) | 2006-07-20 |
| TW200624570A (en) | 2006-07-16 |
| CN1811004A (en) | 2006-08-02 |
| KR20060083142A (en) | 2006-07-20 |
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