CN106460108A - Steel for mold for plastic with high specularity - Google Patents
Steel for mold for plastic with high specularity Download PDFInfo
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- CN106460108A CN106460108A CN201480076900.2A CN201480076900A CN106460108A CN 106460108 A CN106460108 A CN 106460108A CN 201480076900 A CN201480076900 A CN 201480076900A CN 106460108 A CN106460108 A CN 106460108A
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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
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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
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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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Abstract
This steel for molds for plastics having high specularity is a steel material which contains 0.20-0.50 mass% C and 10.50-20.00 mass% Cr. When among regions crowded with carbides and present in the steel material, the crowded regions in which the carbides constituting the crowded regions have a grain diameter of 5 [mu]m or larger in terms of equivalent-circle diameter and the carbide-to-carbide distance is 30 [mu]m or shorter and which have an area of 1,000 [mu]m2 or larger are called material grains, then these material grains have a maximum length of 1,000 [mu]m or shorter and the areal proportion of the material grains is 2.0% or less. By thus regulating the sizes of the material grains, which relate to regions crowded with carbides, the mirror finishing property can be improved.
Description
Technical field
The present invention relates to the die steel of the high minute surface of plastic for the high minute surface of molding.
Background technology
It is mirror that the plastic that electronic equipment in recent years or the container of the articles for daily use and lens etc. are used requires surface
Face, intensity height etc..Therefore, for the mould for molding high mirror plastic product as above it is desirable to the mirror of die surface
Face degree height, excellent in wear resistance and excellent corrosion resistance etc..As the metal material with feature as above, use
The martensitic stain less steels such as SUS420 system steel.
Especially for obtaining high minute surface degree, need shaggy concavo-convex and bending during mirror ultrafinish minimum, and
The defects such as pin hole are few.For example, in patent documentation 1, in order to reduce thick crystallization carbonitride, disclose following plastics and become
Type die steel, it contains C：Below 0.80 mass %, Si：0.01 mass % is less than 1.40 mass %, Mn：0.05 mass %
Above and below 2.0 mass %, Ni：More than 0.005 mass % and below 1.00 mass %, Cr：More than 13.0 mass % and 20.0 matter
Amount below %, Mo+1/2W：More than 0.20 mass % and below 4.0 mass %, V：More than 0.01 mass % and below 1.00 mass %, N：
More than 0.36 mass % and below 0.80 mass %, O：Below 0.02 mass % and Al：Below 0.80 mass %, surplus is substantially by Fe
Constitute with inevitable impurity.In addition, in patent documentation 2, in order to reduce non-metallic inclusion, disclosing following plastics note
Penetrate mold for forming material, it has consisting of：Contain C by weight：0.30~0.80%、Si：Less than 1%, Mn：1% with
Under, Ni：Less than 1%, Mo：Less than 1%, Cr：6.0~15.0%、Cu：Less than 1%, V：Less than 0.50%, and based on area percentage
The upper limit of the non-metallic inclusion containing is 0.015%, and surplus is made up of Fe and inevitable impurity；It can be in more than HRC45
Hardness, use under the processing roughness of 0.010 μm of below Rmax.
Prior art literature
Patent documentation
Patent documentation 1：Japanese Unexamined Patent Publication 2007-9321 publication
Patent documentation 2：No. 2580186 publications of Japanese Patent Publication No..
Content of the invention
Invent problem to be solved
But, the purpose of the die steel described in patent documentation 1 is to make the sum of the carbonitride that particle diameter is less than 4.0 μm
For more than 90% although limiting the particle diameter of carbonitride to improve minute surface degree, but cannot prevent from carrying out mirror ultrafinish to mould
When surface bows and concavo-convex.Further, since adding N, so cannot be carried out the remeltings such as VAR (vacuum arc remelting), therefore
Cannot be carried out deoxidation treatment, increased by this oxide system field trash, easily produce the defects such as pin hole, also having in this cannot
Obtain the problem of high minute surface degree.
In addition, the die steel described in patent documentation 2 carries out three remeltings of furnace melting+ESR (electroslag remelting)+VAR
System, therefore has that yield rate is poor, the problem of cost rising.In addition, in order to improve minute surface degree although limiting non-metallic inclusion
Higher limit, but surface bows and concavo-convex cannot be prevented from mould is carried out during mirror ultrafinish, therefore have and cannot obtain high minute surface
The problem of degree.
The present invention completes in view of the above problems, it is intended that by limiting the material relevant with carbide dense band
The size of granule (material mesh), provides the high mirror-surface plastic die steel that improve minute surface degree.
Means to solve the problem
The high mirror-surface plastic die steel of the present invention is characterised by, it is containing C：0.20 ~ 0.50 mass %, Cr：10.50~
The steel of 20.00 mass %, when following structure is defined as material granule, the greatest length of this material granule be 1000 μm with
Under, and the area occupation ratio of material granule is less than 2.0%, described structure is carbide dense band present in described steel, and
The particle diameter constituting the carbide of this dense band based on diameter of equivalent circle is more than 5 μm, space of carbides from for less than 30 μm, this carbon
The area of compound dense band is 1000 μm2More than.
In this high mirror-surface plastic die steel, such as it is characterised in that described steel contain S further：0.009 matter
Amount below %, O：Below 30ppm, for non-metallic inclusion present in described steel, based on diameter of equivalent circle, particle diameter is 25
The quantity of the field trash more than μm is 5/200mm2Hereinafter, particle diameter is 10 ~ 24 μm of field trash and based on diameter of equivalent circle
Quantity be 25/200mm2Below.
Described steel can make the steel with following composition further：Containing Si：0.30 ~ 1.30 mass %, Mn：0.30~
1.50 mass %, Mo：0.05 ~ 0.50 mass %, V：0.05 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus by Fe and
Inevitably impurity is constituted.
The effect of invention
According to the present invention, during mirror ultrafinish, the shaggy concavo-convex generation diminishing with bending, suppressing pin hole, improves minute surface degree.
In addition, according to the present invention, the die steel of highly corrosion resistant and high abrasion resistance can be obtained at low cost.
Brief description
Fig. 1 is the microscope macrograph representing material granule, and (a) represents the length of material granule and material granule, (b)
Represent space of carbides from.
Specific embodiment
The present inventor etc. finds, in order to improve the minute surface degree of die steel, needs to reduce the shaggy concavo-convex of steel
And bending.Specifically, it is conceived to carbide dense band, first material granule is defined as following structure, described structure is steel
Carbide dense band present in material, and based on diameter of equivalent circle, the particle diameter of the carbide of this dense band of composition is more than 5 μm,
From for less than 30 μm, the area of this carbide dense band is 1000 μm to space of carbides2More than.In other words, by following structure
It is defined as the material granule having in mind in the present invention, described structure is that the carbide that larger carbide is existed with shorter interval is close
Collection band, and the area of this dense band is larger.
Then, the present invention by the greatest length of this material granule and area occupation ratio be limited in respectively less than 1000 μm, 2.0% with
Under.The inventors discovered that, so make the greatest length of material granule be less than 1000 μm, and make the area occupation ratio of material granule be
Less than 2.0%, thus, the shaggy concavo-convex and bending of steel diminishes, and minute surface degree significantly improves.In the present invention, by equivalent
The carbide that circular diameter meter particle diameter is less than 5 μm is not considered as material granule.Its reason is, if carbide particle diameter is less than 5 μm,
Even if then space of carbides is from for less than 30 μm, when preparing plastic, do not transfer concavo-convex on the surface of plastics yet.But,
If carbide particle diameter is more than 5 μm, concavo-convex in the surface transfer of plastics, therefore it is conceived to the carbide that particle diameter is more than 5 μm.
In addition, space of carbides from the carbide more than 30 μm significantly scattered in the case of, be changed into each carbonization object point shape
State is it is difficult to produce the concavo-convex transfer to frosting.Thus, it is conceived to space of carbides from carbide is intensive for less than 30 μm
State.Even if additionally, space of carbides, from for less than 30 μm, is less than 1000 μm in the area of carbide dense band2Situation
Under, when preparing plastic, even if transferring the concavo-convex of carbide in frosting, also cannot identify by visual observation.But,
If the area of carbide dense band is 1000 μm2More than, then it is changed into can identifying the recessed of the carbide of frosting by visual observation
Convex size.Therefore, it is conceived to area and be 1000 μm2Above carbide dense band.
It should be noted that, this material granule can be by cold after controlling heating temperature condition and the processing in forge hot and hot rolling
But the processing conditionss such as condition are limiting.
In addition, for non-metallic inclusion present in steel, being more than 25 μm in particle diameter based on diameter of equivalent circle
The quantity of field trash is 5/200mm2Hereinafter, particle diameter is that the quantity of more than 10 μm of field trash is and based on diameter of equivalent circle
25/200mm2The quantity of pin hole during mirror ultrafinish in the case of below, can be reduced further.
In addition, in order to provide non-metallic inclusion low die steel at low cost, preferably rethinking its composition and melt
Change method.
Therefore, the high mirror-surface plastic die steel of the present invention contains C：0.20 ~ 0.50 mass % and Cr：10.50 ~ 20.00 matter
Amount %.Additionally, the high mirror-surface plastic die steel of the present invention wishes there is following composition：Containing Si：0.30 ~ 1.30 mass %, Mn：
0.30 ~ 1.50 mass %, Mo：0.05 ~ 0.50 mass %, V：0.05 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus
It is made up of Fe and inevitable impurity.
Then, to the numerical definiteness reason of the material granule of the present invention, composition restriction reason and composition add reason and
The restriction reason of the size of non-metallic inclusion illustrates.
" material granule：Greatest length is less than 1000 μm, and area occupation ratio is less than 2.0% "
For the Steel for Plastic Die of the present invention, the greatest length of material granule present in steel is less than 1000 μm.Mould
The material granule of tool is transferred in frosting when preparing plastic as concavo-convex, if greatest length, more than 1000 μm, becomes
For the level that can confirm by visual observation, minute surface degree is insufficient, damages outward appearance.In addition, for the Steel for Plastic Die of the present invention,
The area occupation ratio of material granule present in steel is less than 2.0%.If the area occupation ratio of the material granule of mould is big, mould in preparation
During material products, the bending of mould is transferred on plastic, plastic produces bending.If the area of the material granule of mould
Rate more than 2.0%, then is changed into bending the level that can confirm by visual observation, the minute surface degree of mould is insufficient, damages outward appearance.If mould
Minute surface degree insufficient, then the minute surface degree of the plastic of molding is also insufficient.
“C：0.20 ~ 0.50 mass % "
C is the element required for hardness, intensity and mar proof obtaining mould.If C content is fewer than 0.20 mass %, mould
Hardness reduce, mar proof reduce.If in addition, C content is more than 0.50 mass %, produce material granule in large quantities, bending becomes
Greatly.Therefore, the content of C is set to 0.20 ~ 0.50 mass %.
“Cr：10.50 ~ 20.00 mass % "
Cr can improve corrosion resistance, thus be as die steel most important containing element.If the content of Cr is than 10.50 matter
% is few for amount, then corrosion resistance reduces.If in addition, the content of Cr is more than 20.00 mass %, with respect to the cost ratio of corrosion resistance
Raise and waste.Therefore, the content of Cr is set to 10.50 ~ 20.00 mass %.
“Si：0.30 ~ 1.30 mass % "
Si has the effect as deoxidizer identically with following Al.In addition, Si has in purifying reaction during furnace melting
Desulfurization mobilizing function.If the content of Si is fewer than 0.30 mass %, deoxidation and desulfurized effect diminish.If in addition, Si content ratio
1.30 mass % are many, then hot-workability and toughness reduce.Therefore, the content of Si is preferably set to 0.30 ~ 1.30 mass %.
“Mn：0.30 ~ 1.50 mass % "
Mn is for the raising most important element of hardenability.If the content of Mn is fewer than 0.30 mass %, hardenability reduces.In addition,
If the content of Mn is more than 1.50 mass %, hot-workability reduces.Therefore, the content of Mn is preferably set to 0.30 ~ 1.50 mass %.
“Mo：0.05 ~ 0.50 mass % "
Mo is the element required for corrosion resistance improving mould.If the content of Mo is fewer than 0.05 mass %, corrosion resistance drops
Low.If the content of Mo is more than 0.50 mass %, while heat treatment change in size becomes big, cost raises.Therefore, the containing of Mo
Amount is preferably set to 0.05 ~ 0.50 mass %.
“V：0.05 ~ 0.50 mass % "
V is element when forming carbide, preventing from quenching required for coarse grains.If the content of V is fewer than 0.05 mass %,
Coarse grains.If the content of V is more than 0.50 mass %, form thick carbide, reduce machinability and mirror finish.
Therefore, the content of V is preferably set to 0.05 ~ 0.50 mass %.
“Al：Below 0.035 mass % "
Al is element most important as deoxidation material.Al and O combines to form Al2O3, but if Al content is excessively and as Al2O3
Non-metallic inclusion remains, then lead to pin hole in mirror ultrafinish.Therefore, the content of Al is preferably set to below 0.035 mass %.
“S：Below 0.009 mass % "
S is the element inevitably containing in molten steel, is impurity.S is by combining to form MnS with Mn, if conduct more than S content
MnS non-metallic inclusion remains, then lead to pin hole in mirror ultrafinish.Therefore, the content of S be preferably set to 0.009 mass % with
Under.
“O：Below 25ppm "
O is the element inevitably containing in molten steel, is impurity.O and Al combines to form Al2O3If, but as Al2O3Non- gold
Belong to field trash residual, then lead to pin hole.Therefore, the content of O is preferably set to below 25ppm.
" non-metallic inclusion present in steel：Based on diameter of equivalent circle, particle diameter is the quantity of more than 25 μm of field trash
For 5/200mm2Hereinafter, based on diameter of equivalent circle, the quantity of the field trash for 10 ~ 24 μm for the particle diameter is 25/200mm2Below "
If the quantity of non-metallic inclusion is many, the generation rate of thick pin hole raises.Specifically, with regard to non-metallic inclusion
Speech, if particle diameter is more than 25 μm based on diameter of equivalent circle, easily produces by the pin hole leading to such as come off of field trash itself, separately
If particle diameter is 10 ~ 24 μm based on diameter of equivalent circle outward, the flaw with non-metallic inclusion as starting point can be produced when grinding and make
For pin hole.Therefore, for the quantity of non-metallic inclusion, based on diameter of equivalent circle, particle diameter is the number of more than 25 μm of field trash
Amount is set to 5/200mm2Hereinafter, based on diameter of equivalent circle, the quantity of the field trash for 10 ~ 24 μm for the particle diameter is set to 25/200mm2
Below.More preferably based on diameter of equivalent circle, particle diameter is that the quantity of more than 25 μm of field trash is set to 3/200mm2Hereinafter, and
Based on diameter of equivalent circle, the quantity of the field trash for 10 ~ 24 μm for the particle diameter is set to 20/200mm2Below.It should be noted that, non-gold
The number belonging to field trash can be tried to achieve with optical microscope viewing test piece by corrosion-free land productivity.That is, by 200mm2Observation
The microscopy area in face is enlarged into 100 times and is observed, and measures, by graphical analyses, the big nonmetallic folder that particle diameter is more than 25 μm
The quantity of the debris and particle diameter little non-metallic inclusion for 10 ~ 24 μm, thus can try to achieve and belong to the nonmetallic of each particle size range
The quantity of field trash.
Then, an example of the preparation method of the Steel for Plastic Die of the present invention is illustrated.Above-mentioned for having
The Steel for Plastic Die of composition, uses the fusing such as solvent in electric furnace etc., prepares steel ingot.Furthermore it is preferred that in the table carrying out steel ingot
After the cleaning of face, carry out remelting further, prepare steel ingot, thus can suppress the generation of non-metallic inclusion at low cost.In forge hot
Or during hot rolling, for example heat the material to 1000 ~ 1200 DEG C carry out hot-working after, by the Carbide Precipitation temperature model such as material granule
The rate of cooling in 400 ~ 1000 DEG C enclosed is set to 5 ~ 10 DEG C/min, and 100 DEG C ~ 400 by martensite transformation temperature scope
Rate of cooling in DEG C is set to 200 DEG C/below h, thus while suppressing the generation of material granule, is controlled to suitable geneva
Body is organized.
Embodiment
Hereinafter, it is compared with the comparative example deviateing the scope of the present invention, specifically describe the effect of embodiments of the invention
Really.With electric furnace or induction melting furnace by the melt material of the embodiment of the composition shown in table 1 below and comparative example, prepare the steel of 2t
Ingot.
[table 1]
For embodiment 1 ~ 10 and comparative example 1 ~ 4, then carried out by VAR (vacuum arc remelting) or ESR (electroslag remelting)
Fusing, prepares steel ingot.In addition, for comparative example 5, after fusing in IF (induction melting furnace), carrying out ESR and VAR further,
Prepare steel ingot.It should be noted that, in the case of VAR, vacuum is below 30mTorr.In ESR, using basicity be 1.0 ~
2.0 slag.After the Heating Steel Ingots of embodiment and comparative example are 1000 ~ 1200 DEG C, it is forged to the flat of 200mm × 200mm
Angle, is the bar of 200 DEG C/below h with the rate of cooling for 3 ~ 10 DEG C/min and 100 DEG C ~ 400 DEG C for 400 ~ 1000 DEG C of the rate of cooling
Part cools down, and is annealed.This preparation condition (melting method) is shown in table 2 below.
Then, from this microscope structure observation test film acquired for materials, roughness test piece, salt spraytest piece and
Brilliance test piece.Gather each test film after, implement Quenching Treatment (1000 DEG C ~ 1100 DEG C), the high temperature anneal (450 DEG C ~
550 DEG C), hardness is adjusted to 48 ~ 54HRC.For microscope structure observation test film, using thickness 15mm × width 20mm
The size of × length 30mm, grinds the sightingpiston of 20mm × 30mm with the sand paper of #80 ~ #1500, and polish uses 3 μm of Buddha's warrior attendant
Stone abrasive grains, grind about 60 seconds.Corrode this test film with picrol, with optical microscope with 100 times of observation 200mm2Sight
Examine the microscopy area in face, and take pictures.Carry out graphical analyses with the photo shooting, as shown in figure 1, measuring greatly enhancing most of material granule
Degree and area occupation ratio.Its result is illustrated in table 2 below in the lump.
Number for non-metallic inclusion passes through corrosion-free land productivity optical microscope by 200mm2Sightingpiston mirror
Inspection area is enlarged into 100 times of viewing microscope structure observations and is tried to achieve with test film.Measure particle diameter by graphical analyses and be 25 μm
The quantity of the above big non-metallic inclusion and particle diameter little non-metallic inclusion for 10 ~ 24 μm.Its result is shown in the lump
For in table 2 below.
[table 2]
In addition, for roughness test piece, using the part of thickness 15mm × width 35mm × length 40mm, with #80 ~ #1500
Paper grind 35mm × 40mm aspect of measure, polish be using 3 μm diamond abrasive particles grind about 60 seconds.Then, according to
Measure roughness according to JIS B0633.In addition, measuring number is n=5.The concavo-convex of the surface being led to by material granule uses Ra evaluation, will
Less than 0.02 μm is calculated as qualified (zero).In addition, the bending on surface is evaluated with Pt, less than 0.30 μm is calculated as qualified (zero).Except this
Outside be calculated as unqualified (×).Its result is illustrated in Table 3 below.
For salt spraytest, using the cylindric test film of diameter 18mm × length 15mm, according to JIS Z2371,
Evaluation is got rusty state.Corroded area rate after corroded area rate after 4 hours is less than 30% and 8 hours is less than 50% feelings
Condition is calculated as qualified (◎), and the corroded area rate after 4 hours is the 31% corroded area rate less than 50% and after 8 hours
Situation for less than 50% is calculated as qualified (zero).In addition be calculated as unqualified (×).Its result is illustrated in Table 3 below in the lump
In.
For pin hole, utilize microscope by 200mm corrosion-freely2The microscopy area of sightingpiston be enlarged into 100 times of observations
Microscope structure observation test film.Measure the size of pin hole by graphical analyses and produce number.Will in terms of diameter of equivalent circle 10 ~
24 μm of pin hole produces that number is less than 20 and the pin hole of counting more than 25 μm with diameter of equivalent circle produces number and is calculated as conjunction for less than 1
Lattice (◎), the pin hole counting 10 ~ 24 μm with diameter of equivalent circle are produced number and are less than 20 and more than in terms of diameter of equivalent circle 25 μm
Pin hole produce number be calculated as qualified (zero) for 2 ~ 4.In addition be calculated as unqualified (×).This result is illustrated in following tables in the lump
In 3.
Additionally, minute surface degree glossiness is evaluated.Its result is illustrated in Table 3 below in the lump.Using thickness 15mm × wide
The test film of degree 35mm × length 40mm, grinds the aspect of measure of 35mm × 40mm with the sand paper of #80 ~ #1500, and polish uses 3 μ
The diamond abrasive particles of m, grind about 180 seconds.For glossiness, measure this examination with UV, visible light near infrared spectrometer
Test the aspect of measure of piece, measure the ratio of the light of reflected acceptance.Measurement range be set to visible ray it will be seen that light wavelength be 400 ~
The scope of 700nm and meansigma methodss are that the situation of more than 50% glossiness is evaluated as qualified (◎), by 49 ~ 45% glossiness evaluation
For (zero), glossiness is evaluated as less than 44% (×).
As shown in table 3, for comparative example 1 and comparative example 3 ~ 5, the greatest length due to material granule is more than 1000 μm,
So the concavo-convex Ra on surface unqualified more than 0.02 μm (×) while, glossiness also unqualified (×).
For comparative example 1 ~ 3 and comparative example 5, because the area occupation ratio of material granule is more than 2.0%, so the bending on surface
Pt unqualified more than 0.30 μm (×), glossiness also unqualified (×).
For embodiment 1 ~ 6, it meets claim 1 ~ 3, and roughness and pin hole produce number in acceptability limit, glossiness
For more than 50%, glossiness qualified (◎).
For embodiment 8 although deviateing the scope of claim 3, but due to meeting claim 1 and claim 2,
So roughness and pin hole produce number qualified (◎), glossiness qualified for more than 50% (◎).
For embodiment 7 although meeting claim 1 ~ 3, but because the particle diameter of claim 2 defined is more than 25 μm
Non-metallic inclusion quantity near higher limit (5), so while roughness qualified (zero), but pin hole produces number and exists
In acceptability limit, for 45 ~ 49% in acceptability limit (zero), these are evaluated all than embodiment 1 ~ 6 and 8 for (zero), glossiness
(◎) low.For embodiment 9 and embodiment 10 although meeting claim 1 and claim 3, but due to deviateing claim
2, so while roughness qualified (zero), but pin hole produces number, and (zero), glossiness in acceptability limit are being closed for 45 ~ 49%
In lattice scope (zero), these evaluations are all low than (◎) of embodiment 1 ~ 6 and embodiment 8.
That is, for the embodiment meeting claim 1, the concavo-convex Ra on surface and bending Pt are qualified, and minute surface degree is high, and right
In the embodiment meeting claim 2 and 3, glossiness, pin hole generation number, salt spraytest result are also excellent.
Industrial applicability
Therefore, the high mirror-surface plastic die steel of the present invention can be suitable as requiring the Steel for Plastic Die of minute surface degree.
Claims (according to the 19th article of modification of treaty)
1. high mirror-surface plastic die steel is it is characterised in that it is the steel with consisting of：Containing C：0.20 ~ 0.50 matter
Amount %, Cr：10.50 ~ 20.00 mass %, Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：0.03 ~ 0.50 matter
Amount %, V：0.03 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus is made up of Fe and inevitable impurity, is inciting somebody to action
When following structure is as material granule, the greatest length of described material granule is less than 1000 μm, and the area of material granule
Rate is less than 2.0%, and described structure is carbide dense band present in described steel, and constitutes institute based on diameter of equivalent circle
The particle diameter stating the carbide of dense band is more than 5 μm, space of carbides from for less than 30 μm, the area of described carbide dense band
For 1000 μm2More than.
2. the high mirror-surface plastic die steel of claim 1 is it is characterised in that described steel contain S further：0.009 mass %
Below, O：Below 25ppm, for non-metallic inclusion present in described steel, based on diameter of equivalent circle, particle diameter is 25 μm
The quantity of above field trash is 5/200mm2Hereinafter, particle diameter is 10 ~ 24 μm of field trash and based on diameter of equivalent circle
Quantity is 25/200mm2Below.
Claims (3)
1. high mirror-surface plastic die steel is it is characterised in that it is containing C：0.20 ~ 0.50 mass %, Cr：10.50 ~ 20.00 matter
The steel of amount %, when using following structure as material granule, the greatest length of described material granule is less than 1000 μm, and
The area occupation ratio of material granule is less than 2.0%, and described structure is carbide dense band present in described steel, and presses equivalent
The particle diameter that circular diameter meter constitutes the carbide of described dense band is more than 5 μm, space of carbides from for less than 30 μm, described carbonization
The area of thing dense band is 1000 μm2More than.
2. the high mirror-surface plastic die steel of claim 1 is it is characterised in that described steel contain S further：0.009 mass %
Below, O：Below 25ppm, for non-metallic inclusion present in described steel, based on diameter of equivalent circle, particle diameter is 25 μm
The quantity of above field trash is 5/200mm2Hereinafter, particle diameter is 10 ~ 24 μm of field trash and based on diameter of equivalent circle
Quantity is 25/200mm2Below.
3. the high mirror-surface plastic die steel of claim 1 or 2 is it is characterised in that described steel have consisting of further：
Containing Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：0.05 ~ 0.50 mass %, V：0.05 ~ 0.50 mass %,
Al：Below 0.035 mass %, and surplus is made up of Fe and inevitable impurity.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-044355 | 2014-03-06 | ||
| JP2014044355A JP5705345B1 (en) | 2014-03-06 | 2014-03-06 | High mirror surface plastic mold steel |
| PCT/JP2014/062523 WO2015132977A1 (en) | 2014-03-06 | 2014-05-09 | Steel for mold for plastic with high specularity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106460108A true CN106460108A (en) | 2017-02-22 |
| CN106460108B CN106460108B (en) | 2018-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480076900.2A Active CN106460108B (en) | 2014-03-06 | 2014-05-09 | High mirror-surface plastic die steel |
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| Country | Link |
|---|---|
| JP (1) | JP5705345B1 (en) |
| CN (1) | CN106460108B (en) |
| MY (1) | MY179301A (en) |
| WO (1) | WO2015132977A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI830481B (en) * | 2021-11-09 | 2024-01-21 | 日商日本高周波鋼業股份有限公司 | Mold steel with excellent mirror finishing properties |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7223210B2 (en) * | 2020-06-15 | 2023-02-15 | 日鉄ステンレス株式会社 | Precipitation hardening martensitic stainless steel sheet with excellent fatigue resistance |
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| JP2007009321A (en) * | 2005-06-02 | 2007-01-18 | Daido Steel Co Ltd | Steel for plastic molding die |
| JP2007277639A (en) * | 2006-04-07 | 2007-10-25 | Daido Steel Co Ltd | Martensitic steel |
| JP2009097047A (en) * | 2007-10-18 | 2009-05-07 | Daido Steel Co Ltd | Steel for plastic molding mold, and plastic molding mold |
| JP2010539325A (en) * | 2007-09-10 | 2010-12-16 | オウベル・アンド・デュヴァル | Martensitic stainless steel, manufacturing method of parts made from this steel, and parts manufactured by this method |
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- 2014-03-06 JP JP2014044355A patent/JP5705345B1/en active Active
- 2014-05-09 MY MYPI2016703226A patent/MY179301A/en unknown
- 2014-05-09 CN CN201480076900.2A patent/CN106460108B/en active Active
- 2014-05-09 WO PCT/JP2014/062523 patent/WO2015132977A1/en active Application Filing
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| JP2580186B2 (en) * | 1987-07-18 | 1997-02-12 | 関東特殊製鋼株式会社 | Mold material for plastic injection molding |
| JP2001150122A (en) * | 1999-11-25 | 2001-06-05 | Hitachi Metals Ltd | Manufacturing method of stock for cold/warm plastic working and its cold/warm plastic working method |
| CN1676653A (en) * | 2005-04-18 | 2005-10-05 | 宝钢集团上海五钢有限公司 | Anticorrosion, wear-resistant plastic die steel 4Cr16Mo and its mirror large-die-block preparing and producing method |
| JP2007009321A (en) * | 2005-06-02 | 2007-01-18 | Daido Steel Co Ltd | Steel for plastic molding die |
| JP2007277639A (en) * | 2006-04-07 | 2007-10-25 | Daido Steel Co Ltd | Martensitic steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI830481B (en) * | 2021-11-09 | 2024-01-21 | 日商日本高周波鋼業股份有限公司 | Mold steel with excellent mirror finishing properties |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015168850A (en) | 2015-09-28 |
| WO2015132977A1 (en) | 2015-09-11 |
| CN106460108B (en) | 2018-04-27 |
| JP5705345B1 (en) | 2015-04-22 |
| MY179301A (en) | 2020-11-04 |
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