CN106460108B - High mirror-surface plastic die steel - Google Patents
High mirror-surface plastic die steel Download PDFInfo
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- CN106460108B CN106460108B CN201480076900.2A CN201480076900A CN106460108B CN 106460108 B CN106460108 B CN 106460108B CN 201480076900 A CN201480076900 A CN 201480076900A CN 106460108 B CN106460108 B CN 106460108B
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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
The high mirror-surface plastic die steel of the present invention is to contain C：0.20 ~ 0.50 mass %, Cr：The steel of 10.50 ~ 20.00 mass %.Will be using lower structure as material granule when, the maximum length of the material granule is less than 1000 μm, and the area occupation ratio of material granule is less than 2.0%, the structure is that there are carbide dense band in the steel, and the particle diameter that the carbide of the dense band is formed based on diameter of equivalent circle is more than 5 μm, distance is less than 30 μm between carbide, and the area of the carbide dense band is 1000 μm2More than.As described above, the size by limiting the material granule related with carbide dense band, can improve minute surface degree.
Description
Technical field
The present invention relates to the die steel of the high minute surface of the plastic products for being molded high minute surface.
Background technology
It is mirror that plastic products used in electronic equipment or the container of daily necessities and lens in recent years etc., which require surface,
Face, intensity height etc..Therefore, for the mould for being molded high mirror plastic product as described 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 described above, use
The martensitic stain less steels such as SUS420 systems steel.
Especially for obtain high minute surface degree, it is necessary to shaggy concavo-convex during mirror ultrafinish and bend it is minimum, and
The defects of pin hole, is few.For example, in patent document 1, in order to reduce thick crystallization carbonitride, disclose following plastics into
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
Measure 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
Formed with inevitable impurity.In addition, in patent document, in order to reduce non-metallic inclusion, disclose following plastics note
Mold for forming material is penetrated, it is with 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 contained is 0.015%, and surplus is made 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 document
Patent document 1：Japanese Unexamined Patent Publication 2007-9321 publications
Patent document 2：No. 2580186 publications of Japanese Patent Publication No..
The content of the invention
Problems to be solved by the invention
But the purpose of the die steel described in patent document 1 is the carbonitride for making particle diameter be less than 4.0 μm
Sum is more than 90%, although limiting the particle diameter of carbonitride to improve minute surface degree, can not prevent from carrying out minute surface to mould
Surface bows and bumps during grinding.Further, since addition N, so the remeltings such as VAR (vacuum arc remelting) can not be carried out,
Therefore deoxidation treatment can not be carried out, thus oxide system field trash increases, and easily the defects of generation pin hole, also has in this
It can not obtain the problem of high minute surface is spent.
In addition, the die steel described in patent document 2 carries out three remeltings of furnace melting+ESR (electroslag remelting)+VAR
System, therefore have the problem of poor yield rate, cost rise.In addition, in order to improve minute surface degree, although limiting non-metallic inclusion
Upper limit value, but can not prevent from carrying out mould surface bows and bumps during mirror ultrafinish, therefore have and can not obtain high minute surface
The problem of spending.
The present invention completes in view of the above problems, it is intended that by limiting the material related with carbide dense band
The size of particle (material mesh), there is provided improve the high mirror-surface plastic die steel of minute surface degree.
The means to solve the problem
The high mirror-surface plastic die steel of the present invention is characterized in that it is the steel with consisting of：Contain C：
0.20 ~ 0.50 mass %, Cr：10.50 ~ 20.00 mass %, Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：
0.03 ~ 0.50 mass %, V：0.03 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus by Fe and inevitably it is miscellaneous
Texture is into when that will be defined as material granule with lower structure, the maximum length of the material granule is less than 1000 μm, and material
The area occupation ratio of particle is less than 2.0%, and the structure is carbide dense band present in the steel, and straight by equivalent circle
The particle diameter that footpath meter forms the carbide of the dense band is more than 5 μm, and distance is less than 30 μm between carbide, the carbide dense band
Area be 1000 μm2More than.
In the high mirror-surface plastic die steel, such as, it is characterised in that the steel further contain S：0.009 matter
Measure below %, O：Below 30ppm, for non-metallic inclusion present in the steel, particle diameter is 25 based on diameter of equivalent circle
The quantity of field trash more than μm is 5/200mm2Hereinafter, and particle diameter is 10 ~ 24 μm of field trash based on diameter of equivalent circle
Quantity be 25/200mm2Below.
The steel can be further made with the steel formed as follows：Contain 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
Inevitable impurity is formed.
The effect of invention
According to the present invention, shaggy concavo-convex and bending diminishes during mirror ultrafinish, suppresses the generation of pin hole, improves minute surface
Degree.In addition, according to the present invention, highly corrosion resistant and the die steel of high abrasion resistance can be obtained at low cost.
Brief description of the drawings
Fig. 1 is the microscope macrograph for representing material granule, and (a) represents the length of material granule and material granule, (b)
Distance between expression carbide.
Embodiment
The inventors of the present invention have found, in order to improve the minute surface degree of die steel, it is necessary to reduce the shaggy bumps of steel
And bending.Specifically, it is conceived to carbide dense band, material granule is defined as with lower structure first, the structure is steel
Carbide dense band present in material, and the particle diameter of the carbide of the composition dense band is more than 5 μm based on diameter of equivalent circle,
Distance is less than 30 μm between carbide, and the area of the carbide dense band is 1000 μm2More than.In other words, will be with lower structure
The material granule having in mind in the present invention is defined as, the structure is that larger carbide is close with carbide existing for shorter interval
Collect band, and the area of the dense band is larger.
Then, the present invention by the maximum length and area occupation ratio of the material granule be limited in respectively less than 1000 μm, 2.0% with
Under.The inventors discovered that the maximum length for so making material granule is less than 1000 μm, and the area occupation ratio of material granule is set to 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
Carbide of the circular diameter meter particle diameter less than 5 μm is without considering as material granule.If the reason is that carbide particle diameter be less than 5 μm,
Even if then distance is less than 30 μm between carbide, when preparing plastic products, bumps are not also transferred on the surface of plastics.But
It is concavo-convex in the surface transfer of plastics if carbide particle diameter is more than 5 μm, therefore it is conceived to the carbide that particle diameter is more than 5 μm.
In addition, between carbide distance more than 30 μm and carbide it is significantly scattered in the case of, be changed into each carbonization object point shape
State, it is difficult to produce the concavo-convex transfer to frosting.Thus, it is conceived between carbide distance as less than 30 μm and carbide is intensive
State.In addition, even if distance is less than 30 μm between carbide, it is less than 1000 μm in the area of carbide dense band2Situation
Under, when preparing plastic products, even in the bumps of frosting transfer carbide, can not also identify by visual observation.But
If the area of carbide dense band is 1000 μm2More than, then be changed into identifying by visual observation frosting carbide it is recessed
Convex size.Therefore, it is conceived to area as 1000 μm2Carbide dense band above.
It should be noted that the material granule can be cold after heating temperature condition and the processing in hot forging and hot rolling by controlling
But the processing conditions such as condition limits.
In addition, for non-metallic inclusion present in steel, based on diameter of equivalent circle particle diameter be more than 25 μm
The quantity of field trash is 5/200mm2Hereinafter, and particle diameter is that the quantity of more than 10 μm of field trash is based on diameter of equivalent circle
25/200mm2In the case of below, the quantity of pin hole when can further reduce mirror ultrafinish.
In addition, in order to provide non-metallic inclusion low die steel at low cost, preferably rethink its composition and melt
Change method.
Therefore, high mirror-surface plastic die steel of the invention contains C：0.20 ~ 0.50 mass %, Cr：10.50 ~ 20.00 matter
Measure %, Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：0.03 ~ 0.50 mass %, V：0.03 ~ 0.50 mass %,
Al：Below 0.035 mass %, and surplus is made of Fe and inevitable impurity.In addition, the high mirror plastic mould of the present invention
Tool steel wishes there is following composition：Contain Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：0.05 ~ 0.50 matter
Measure %, V：0.05 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus is made of Fe and inevitable impurity.
Then, to the present invention material granule numerical definiteness reason, composition restriction reason and component addition reason and
The restriction reason of the size of non-metallic inclusion illustrates.
" material granule：Maximum 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 maximum length of material granule present in steel for 1000 μm with
Under.The material granule of mould is transferred in frosting when preparing plastic products as bumps, if maximum length more than 1000 μm,
Then it is changed into the level that can be confirmed by visual observation, minute surface degree is insufficient, damages appearance.In addition, the Steel for Plastic Die with regard to the present invention
For, 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, making
During standby plastic products, the bending of mould is transferred on plastic products, plastic products produce bending.If the material granule of mould
Area occupation ratio is then changed into the level that bending can confirm by visual observation more than 2.0%, and the minute surface degree of mould is insufficient, damages appearance.If
The minute surface degree of mould is insufficient, then the minute surface degree of molding plastic products is also insufficient.
“C：0.20 ~ 0.50 mass % "
C is to obtain the required element of hardness, intensity and wear resistance of mould.If C content is fewer than 0.20 mass %,
The hardness of mould reduces, and wear resistance reduces.In addition, if C content is more than 0.50 mass %, material granule is produced in large quantities, it is curved
Qu Bian great.Therefore, the content of C is set to 0.20 ~ 0.50 mass %.
“Cr：10.50 ~ 20.00 mass % "
Cr can improve corrosion resistance, so being most important containing element as die steel.If the content of Cr is than 10.50
Quality % is few, then corrosion resistance reduces.In addition, if the content of Cr is more than 20.00 mass %, relative to the cost ratio of corrosion resistance
Example is raised and wasted.Therefore, the content of Cr is set to 10.50 ~ 20.00 mass %.
“Si：0.30 ~ 1.30 mass % "
Si has the function that to be used as deoxidier identically with following Al.In addition, Si has refining during furnace melting anti-
Desulfurization mobilizing function in answering.If the content of Si is fewer than 0.30 mass %, deoxidation and desulfurization effect diminish.If in addition, Si contents
More than 1.30 mass %, then hot-workability and toughness reduce.Therefore, the content of Si is set to 0.30 ~ 1.30 mass %.
“Mn：0.30 ~ 1.50 mass % "
Mn is for improving the 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 set to 0.30 ~ 1.50 mass %.
“Mo：0.03 ~ 0.50 mass %, preferably more than 0.05 mass % "
Mo is the required element of corrosion resistance for improving mould.If the content of Mo is fewer than 0.05 mass %, corrosion resistance
Reduce.If the content of Mo is more than 0.50 mass %, while heat treatment change in size becomes larger, cost rise.Therefore, Mo
Content is set to 0.03 ~ 0.50 mass %, preferably more than 0.05 mass %.
“V：0.03 ~ 0.50 mass %, preferably more than 0.05 mass % "
V is coarse grainsization required element when forming carbide, prevent from quenching.If the content of V is than 0.05 mass %
Lack, then coarse grains.If the content of V is more than 0.50 mass %, thick carbide is formed, machinability is reduced and minute surface adds
Work.Therefore, the content of V is set to 0.03 ~ 0.50 mass %, preferably more than 0.05 mass %.
“Al：Below 0.035 mass % "
Al is as the most important element of deoxidation material.Al and O combines to form Al2O3If but Al content excessively conduct
Al2O3Non-metallic inclusion remains, then causes pin hole in mirror ultrafinish.Therefore, the content of Al is set to below 0.035 mass %.
“S：Below 0.009 mass % "
S is the element inevitably contained in molten steel, is impurity.S with Mn by combining to form MnS, if more than S contents
Remained as MnS non-metallic inclusions, then cause pin hole in mirror ultrafinish.Therefore, the content of S is preferably set to 0.009 mass %
Below.
“O：Below 25ppm "
O is the element inevitably contained in molten steel, is impurity.O and Al combines to form Al2O3If but as Al2O3
Non-metallic inclusion remains, then causes pin hole.Therefore, the content of O is preferably set to below 25ppm.
" non-metallic inclusion present in steel：Particle diameter is the quantity of more than 25 μm of field trash based on diameter of equivalent circle
For 5/200mm2Hereinafter, the quantity for the field trash that particle diameter is 10 ~ 24 μm is 25/200mm based on diameter of equivalent circle2Below "
If the quantity of non-metallic inclusion is more, the generation rate rise of thick pin hole.Specifically, with regard to nonmetal inclusion
For thing, if particle diameter is more than 25 μm based on diameter of equivalent circle, pin caused by easily producing as field trash coming off etc. in itself
Hole, if in addition particle diameter is 10 ~ 24 μm based on diameter of equivalent circle, the flaw using non-metallic inclusion as starting point can be produced in grinding
Defect is as pin hole.Therefore, for the quantity of non-metallic inclusion, particle diameter is more than 25 μm of field trash based on diameter of equivalent circle
Quantity be set to 5/200mm2Hereinafter, based on diameter of equivalent circle particle diameter be 10 ~ 24 μm field trash quantity be set to 25/
200mm2Below.Particle diameter is that the quantity of more than 25 μm of field trash is set to 3/200mm more preferably based on diameter of equivalent circle2Hereinafter,
And particle diameter is that the quantity of 10 ~ 24 μm of field trash is set to 20/200mm based on diameter of equivalent circle2Below.It should be noted that
The number of non-metallic inclusion can be tried to achieve by corrosion-free land productivity with light microscope viewing test piece.That is, by 200mm2's
The microscopy area of viewing surface is enlarged into 100 times and is observed, and the big non-gold that particle diameter is more than 25 μm is measured by graphical analysis
Belong to the quantity of field trash and particle diameter for 10 ~ 24 μm of small non-metallic inclusion, thus can try to achieve and belong to the non-of each particle size range
The quantity of metallic inclusion.
Then, an example of the preparation method of the Steel for Plastic Die of the present invention is illustrated.For with above-mentioned
The Steel for Plastic Die of composition, using the fusing such as solvent in electric furnace etc., prepares steel ingot.Furthermore it is preferred that carrying out the table of steel ingot
After the cleaning of face, remelting is further carried out, prepares steel ingot, thus can suppress the generation of non-metallic inclusion at low cost.In hot forging
Or during hot rolling, such as heat the material to 1000 ~ 1200 DEG C carry out hot-working after, by the Carbide Precipitation temperature model such as material granule
The cooling velocity in 400 ~ 1000 DEG C enclosed is set to 5 ~ 10 DEG C/min, and by 100 DEG C ~ the 400 of martensite transformation temperature scope
Cooling velocity in DEG C is set to 200 DEG C/below h, thus while the generation of material granule is suppressed, controls as suitable geneva
Body tissue.
Embodiment
Hereinafter, compared with deviateing the comparative example of the scope of the present invention, the effect of the embodiment of the present invention is specifically described
Fruit.The material of the embodiment of the composition shown in table 1 below and comparative example is melted with electric furnace or induction melting furnace, prepares the steel of 2t
Ingot.
[table 1]
For embodiment 1 ~ 10 and comparative example 1 ~ 4, then pass through VAR (vacuum arc remelting) or ESR (electroslag remelting)
Melted, prepare steel ingot.In addition, for comparative example 5, in IF (induction melting furnace) after fusing, further carry out ESR and
VAR, prepares steel ingot.It should be noted that in the case of VAR, vacuum is below 30mTorr.In ESR, it is using basicity
1.0 ~ 2.0 slag.After being 1000 ~ 1200 DEG C by the Heating Steel Ingots of embodiment and comparative example, 200mm × 200mm is forged to
The straight angle, be 3 ~ 10 DEG C/min and 100 DEG C ~ 400 DEG C of cooling velocity for 200 DEG C/below h using 400 ~ 1000 DEG C of cooling velocity
Condition cooling, anneal.The preparation condition (melting method) is shown in table 2 below.
Then, from the microscope structure observation test film acquired for materials, roughness test piece, salt spraytest piece and
Brilliance test piece.After each test film is gathered, 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, with the viewing surface of sand paper grinding 20mm × 30mm of #80 ~ #1500, finishing uses 3 μm of Buddha's warrior attendant
Stone abrasive grains, grind about 60 seconds.Corrode the test film with picrol, with light microscope with 100 times of observation 200mm2Sight
The microscopy area in face is examined, and is taken pictures.Graphical analysis is carried out with the photo of shooting, as shown in Figure 1, measure material granule most greatly enhances
Degree and area occupation ratio.Its result is illustrated in table 2 below in the lump.
For non-metallic inclusion number by corrosion-free land productivity light microscope by 200mm2Viewing surface mirror
Inspection area is enlarged into 100 times of viewing microscope structure observations and is tried to achieve with test film.It is 25 μm to measure particle diameter by graphical analysis
The big non-metallic inclusion and particle diameter of the above are the quantity of 10 ~ 24 μm of small non-metallic inclusion.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 ~ #
The aspect of measure of 1500 paper grinding 35mm × 40mm, finishing are ground about 60 seconds using 3 μm of diamond abrasive particles.So
Afterwards, according to JIS B0633 measure roughness.In addition, measure number is n=5.The bumps on the surface as caused by material granule are commented with Ra
Valency, 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).
In addition it is 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,
Evaluate state of getting rusty.By 4 when small after corroded area rate be less than 30% and 8 it is small when after corroded area rate be less than 50% feelings
Condition is calculated as qualified (◎), by 4 when small after corroded area rate for 31% less than 50% and 8 it is small when after corroded area rate
It is calculated as qualified (zero) for less than 50% situation.In addition it is calculated as unqualified (×).Its result is illustrated in Table 3 below in the lump
In.
For pin hole, microscope is utilized corrosion-freely by 200mm2The microscopy area of viewing surface be enlarged into 100 times of observations
Microscope structure observation test film.The size of pin hole is measured by graphical analysis and produces number.Will in equivalent circle diameter 10 ~
The pin hole generation number that 24 μm of pin hole generation number is less than 20 and in equivalent circle diameter more than 25 μm is less than 1 and is calculated as closing
Lattice (◎), will in equivalent circle diameter 10 ~ 24 μm pin hole produce number be less than 20 and more than 25 μm in equivalent circle diameter
Pin hole produce number and be calculated as qualified (zero) for 2 ~ 4.In addition it is calculated as unqualified (×).The result is illustrated in following tables in the lump
In 3.
In addition, minute surface degree is evaluated with glossiness.Its result is illustrated in Table 3 below in the lump.Using thickness 15mm × wide
The test film of 35mm × length 40mm is spent, with the aspect of measure of sand paper grinding 35mm × 40mm of #80 ~ #1500, finishing uses 3 μ
The diamond abrasive particles of m, grind about 180 seconds.For glossiness, the examination is measured with UV, visible light near infrared spectrometer
The aspect of measure of piece is tested, measures the ratio of the light received through reflection.Measurement range is set to visible ray, it will be seen that the wavelength of light for 400 ~
The scope and average value of 700nm is that the situation of more than 50% glossiness is evaluated as qualified (◎), and 49 ~ 45% glossiness is evaluated
For (zero), glossiness is evaluated as (×) for less than 44%.
[table 3]
As shown in table 3, for comparative example 1 and comparative example 3 ~ 5, since the maximum length of material granule is more than 1000 μm,
So surface concavo-convex Ra more than 0.02 μm and while unqualified (×), glossiness is also unqualified (×).
For comparative example 1 ~ 3 and comparative example 5, since the area occupation ratio of material granule is more than 2.0%, so the bending on surface
Pt is unqualified (×) more than 0.30 μm, and glossiness is also unqualified (×).
For embodiment 1 ~ 6 and 8, roughness and pin hole produce number in acceptability limit, and glossiness is more than 50%, gloss
Degree is qualified (◎).
For embodiment 7, since the quantity for the non-metallic inclusion that the particle diameter based on diameter of equivalent circle is more than 25 μm exists
Near upper limit value (5), so while roughness qualification (zero), but pin hole produces number (zero), glossiness in acceptability limit
For 45 ~ 49% in acceptability limit (zero), (◎) of these evaluations than embodiment 1 ~ 6 and 8 is low.For embodiment 9 and implement
Example 10, although roughness qualification (zero), pin hole produce number in acceptability limit (zero), glossiness for 45 ~ 49% and in qualification
In scope (zero), (◎) of these evaluations than embodiment 1 ~ 6 and embodiment 8 is low.
That is, for embodiment 1 ~ 10, the concavo-convex Ra and bending Pt on surface are qualified, and minute surface degree is high, and for embodiment 1 ~
8, glossiness, pin hole generation number, salt spraytest result are also excellent.
Industrial applicability
Therefore, high mirror-surface plastic die steel of the invention can be suitable as requiring the Steel for Plastic Die of minute surface degree.
Claims (2)
1. high mirror-surface plastic die steel, it is characterised in that it is the steel with consisting of：Contain C：0.20 ~ 0.50 matter
Measure %, Cr：10.50 ~ 20.00 mass %, Si：0.30 ~ 1.30 mass %, Mn：0.30 ~ 1.50 mass %, Mo：0.03 ~ 0.50 matter
Measure %, V：0.03 ~ 0.50 mass %, Al：Below 0.035 mass %, and surplus is made of Fe and inevitable impurity, is being incited somebody to action
During using lower structure as material granule, the maximum length of the material granule is less than 1000 μm, and the area of material granule
Rate is less than 2.0%, and the structure is carbide dense band present in the steel, and institute is formed based on diameter of equivalent circle
The particle diameter for stating the carbide of dense band is more than 5 μm, and distance is less than 30 μm between carbide, the area of the carbide dense band
For 1000 μm2More than.
2. the high mirror-surface plastic die steel of claim 1, it is characterised in that the steel further contain S：0.009 mass %
Below, O：Below 25ppm, for non-metallic inclusion present in the steel, particle diameter is 25 μm based on diameter of equivalent circle
The quantity of field trash above is 5/200mm2Hereinafter, and particle diameter is 10 ~ 24 μm of field trash based on diameter of equivalent circle
Quantity is 25/200mm2Below.
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 CN106460108A (en) | 2017-02-22 |
| CN106460108B true CN106460108B (en) | 2018-04-27 |
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| 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) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP7152582B1 (en) * | 2021-11-09 | 2022-10-12 | 日本高周波鋼業株式会社 | Mold steel with excellent mirror finish |
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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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP2007009321A (en) * | 2005-06-02 | 2007-01-18 | Daido Steel Co Ltd | Steel for plastic molding die |
| JP4952888B2 (en) * | 2006-04-07 | 2012-06-13 | 大同特殊鋼株式会社 | Martensite steel |
| FR2920784B1 (en) * | 2007-09-10 | 2010-12-10 | Aubert & Duval Sa | MARTENSITIC STAINLESS STEEL, PROCESS FOR MANUFACTURING WORKPIECES PRODUCED IN THIS STEEL AND PARTS PRODUCED THEREBY |
| JP5186878B2 (en) * | 2007-10-18 | 2013-04-24 | 大同特殊鋼株式会社 | Steel for plastic molds and plastic molds |
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2014
- 2014-03-06 JP JP2014044355A patent/JP5705345B1/en active Active
- 2014-05-09 WO PCT/JP2014/062523 patent/WO2015132977A1/en active Application Filing
- 2014-05-09 CN CN201480076900.2A patent/CN106460108B/en active Active
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
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| Publication number | Publication date |
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| WO2015132977A1 (en) | 2015-09-11 |
| JP5705345B1 (en) | 2015-04-22 |
| JP2015168850A (en) | 2015-09-28 |
| CN106460108A (en) | 2017-02-22 |
| MY179301A (en) | 2020-11-04 |
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