CN105803342B - A kind of preparation method of making Nano surface low-alloy steel mould - Google Patents
A kind of preparation method of making Nano surface low-alloy steel mould Download PDFInfo
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- CN105803342B CN105803342B CN201610248300.0A CN201610248300A CN105803342B CN 105803342 B CN105803342 B CN 105803342B CN 201610248300 A CN201610248300 A CN 201610248300A CN 105803342 B CN105803342 B CN 105803342B
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
-
- 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
-
- 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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
Abstract
The invention discloses a kind of preparation method of making Nano surface low-alloy steel mould, comprise the following steps：(1) mould raw material is carried out to smelting cast, rolling successively, low-alloy steel is obtained；(2) low-alloy steel is processed, obtains low-alloy steel mould；(3) low-alloy steel mould is carried out to nanosizing processing, nitrogen treatment, oxidation processes, immersion oil processing successively, making Nano surface low-alloy steel mould is obtained；Mould raw material in the step (1), is made up of the raw material of following mass percents：C 0.02 0.08%, Cr 0.5 0.9%, Si 0.1 0.6%, Mn 0.33 0.38%, Mo 0.17 0.24%, Ni 0.05 0.15%, Co 0.02 0.08%, Nb 0.05 0.08%, W 0.15 0.35%, P 0.002 0.008%, S 0.002 0.008%, surplus is Fe.Present invention process is simple, and with low cost, energy-conserving and environment-protective are nuisanceless, working environment cleaning, the features such as appearance looks elegant；Every environmental protection index is determined through environmental administration and is up to state standards, while making the wearability of metal surface, corrosion resistance and mechanical property hardness strength have raising by a larger margin.
Description
Technical field
The present invention relates to Alloy-steel mold technical field, more particularly to a kind of preparation of making Nano surface low-alloy steel mould
Method.
Background technology
The social demand in 20th century and technology development form current Aldecor, structural alloy steel, superelevation
The steel alloy kind system such as strength steel, stainless corrosion-resistant steel, heat resisting steel, tool steel, mould steel, bearing steel.It is high into after 21 century
Layer building, deeper subsurface and the heavily loaded bridge of marine facility, large span, light energy-saving automobile, oil exploitation and long distance oil-gas are defeated
Send each being required for property of department of the national economy such as pipeline, the ship of war, aerospace vehicle, high-speed railway facility, energy facilities
Can high, service life length and the low novel alloy steel of cost.The exploitation actuality of steel alloy can be described as high performance and many product
Kindization.
The cleanliness factor for improving mould steel is one of developing direction of mould steel.Research shows：SKD 61(4Cr5MoSiW1)
The phosphorus content of steel can make the impact flexibility after mould steel Q-tempering improve 1 times after 0.03% is reduced to 0.01%.If
Phosphorus content is further decreased to 0.001%, and the impact flexibility of mould steel can improve 2 times.The oxygen content for reducing mould steel can also
Improve impact flexibility.The oxygen content of external advanced mould steel is less than 15 × 10-6。
Another developing direction of mould steel is the tropisms such as raising.Improve mould steel transverse toughness and plasticity, be allowed to close
Longitudinal performance, the mold use life-span will increase substantially.Over nearly 20 years, each steel mill all is being directed to developing high tropism mould
Has steel, the ISODISC of such as Austrian Bole steel mill exploitation, the ISOTROPY of FDAC metal, Japan are high-frequency
MICROFINED etc..The 80-95% of transverse toughness and plasiticity index equivalent to longitudinal performance of high tropism mould steel, than general mould
Has the high 40-60% of steel.
QPQ Quench-Polish-Quench technology technologies are nitriding+oxidation technologies that new development in recent years is got up, and are actually one kind
Quench-Polish-Quench technology technology, its agent technology is salt bath nitriding or salt bath nitrocarburizing, then along with one of oxidation operation.
QPQ composite treatment technologies are by salt bath nitriding change of technique.QPQ Quench-Polish-Quench technology technologies are that one kind can be while significantly
Wearability, the corrosion resistance of degree raising metal surface, and the new metal surface enhanced modification technology that workpiece is hardly deformed.QPQ
Quench-Polish-Quench technology technology then has deformation small, processing time short, the significant advantage of energy-saving effect.But traditional QPQ processing skills
Art has infiltration layer relatively thin, it is impossible to meet the demand for bearing fretting wear workpiece of the needs with good corrosion resistance again.
The content of the invention
For above shortcomings in the prior art, the technical problems to be solved by the invention are to provide a kind of surface and received
The preparation method of riceization low-alloy steel mould.
The present invention seeks to what is be achieved through the following technical solutions：
A kind of preparation method of making Nano surface low-alloy steel mould, comprises the following steps：
(1) mould raw material is carried out to smelting cast, rolling successively, low-alloy steel is obtained；
(2) low-alloy steel is processed, obtains low-alloy steel mould；
(3) low-alloy steel mould is carried out to nanosizing processing, nitrogen treatment, oxidation processes, immersion oil processing successively, table is obtained
Face nanosizing low-alloy steel mould.
Preferably, the mould raw material in the step (1), is made up of the raw material of following mass percents：
C 0.02-0.08%, Cr 0.5-0.9%, Si 0.1-0.6%, Mn 0.33-0.38%, Mo 0.17-
0.24%th, Ni 0.05-0.15%, Co 0.02-0.08%, Nb 0.05-0.08%, W 0.15-0.35%, P 0.002-
0.008%th, S 0.002-0.008%, surplus is Fe.
Preferably, the smelting in the step (1) is cast for carrying out refining at the beginning of electric arc furnaces successively, ladle RH processing and LF at
Reason.
Preferably, the rolling in the step (1) include all heat-treated, rolling and cool down, wherein all heat-treated be
Soaking 4-6 hours in 1100-1150 DEG C of heating furnace, the start rolling temperature of rolling is 950-1050 DEG C, finishing temperature is 840-880
DEG C, mill speed is 3-5m/s, and cooling velocity is that the finishing temperature after 5-10 DEG C/s, cooling is 650-680 DEG C.
Preferably, the nanosizing in the step (3) is processed as using the tungsten alloy cutter that power is 280-480W with 10-
20KHZ frequency impacts the surface of the low-alloy steel mould；Impact energy produces 450-650MPA compression；Make to be impacted
Position is able to reinforcing to realize nanosizing, and nano-micrometre gradient-structure is formed on surface.
Preferably, the nitrogen treatment in the step (3) is heated to for the low-alloy steel mould of nanosizing is put into crucible
450 DEG C, add saline oxide 2-5kg and start salt dissolving to saline oxide fusing；Base salt is added in crucible by several times again, heating base salt is whole
Stop adding base salt when salt bath face is risen to apart from crucible top edge 120mm after fusing, adjustment salt 1-2kg is added, in 200-
2.5h is run under the conditions of 350 DEG C.
Preferably, the oxidation processes in the step (3) are that will clean rustless crucible to hang in oxidation furnace, instrument constant temperature
At 220 DEG C, crucible is put the workpiece in, thermocouple abuts sidewall of crucible；Then saline oxide is added in crucible, is added to crucible height
1/3, it is then electrified to fusing；All fusing is gradually added into saline oxide to the salt added for the first time again later, and suitable number is added every time,
Side is melted, and side is added, untill liquid level is increased to apart from crucible top edge 200mm；Salt bath face reach the height of requirement with
Afterwards, 250 DEG C of insulations, make moisture largely volatilize, untill liquid level produces calmness completely there is no bubble；Then salt temperature is again
15-20 DEG C of heating, so circulation, until temperature is raised to 350 DEG C.
Preferably, the immersion oil in the step (3), which is processed as low-alloy steel mould being put into machinery oil, soaks 1-2min.
Preferably, the adjustment salt of nitrogen treatment is made up of the raw material of following weight parts in the step (3)：CO(NH2)2
30-50 parts, Na2CO34-8 parts, K2CO34-10 parts, Li2CO33-7 parts, 5-15 parts of NaCl, 5-15 parts of NaCNO, K2S 5-
15 parts, LiOH 2-5%, La2(CO3)31-5 parts, Nd2(CO3)31-5 parts, Sm2(CO3)31-5 parts.
Preferably, the base salt of nitrogen treatment is made up of the raw material of following weight parts in the step (3)：KCNO 95-105
Part, La2(CO3)31-5 parts, 1-5 parts of praseodymium oxide, 1-5 parts of titanium dioxide, 1-5 parts of terbium sesquioxide.
Preferably, in the step (3) nitrogen treatment and the saline oxide of oxidation processes by 40-60wt%Na2CO3And 40-
60wt%K2CO3Composition.
Specifically, in the present invention：
CO(NH2)2, Chinese：Carbonyl diamide, No. CAS：57-13-6.
Na2CO3, Chinese：Sodium carbonate, No. CAS：497-19-8.
K2CO3, Chinese：Potassium carbonate, No. CAS：584-08-7.
Li2CO3, Chinese：Lithium carbonate, No. CAS：554-13-2.
NaCl, Chinese：Sodium chloride, No. CAS：7647-14-5.
La2(CO3)3, Chinese：Lanthanum carbonate, No. CAS：6487-39-4.
Nd2(CO3)3, Chinese：Neodymium carbonate, No. CAS：5895-46-5.
Sm2(CO3)3, Chinese：Samaric carbonate, No. CAS：38245-37-3.
Praseodymium oxide, molecular formula：Pr2O3, No. CAS：12037-29-5.
Titanium dioxide, molecular formula：TiO2, No. CAS：1317-70-0.
Terbium sesquioxide, molecular formula：Tb2O3, No. CAS：12036-41-8.
NaCNO, Chinese：Zassol, No. CAS：917-61-3.
K2S, Chinese：Potassium sulfide, No. CAS：1312-73-8.
LiOH, Chinese：Lithium hydroxide, No. CAS：1310-65-2.
KCNO, Chinese：Potassium cyanate, No. CAS：590-28-3.
The preparation method of making Nano surface low-alloy steel mould of the present invention, technique is simple, and with low cost, energy-conserving and environment-protective are without public affairs
The features such as evil, working environment cleaning, appearance looks elegant.The technology has accomplished that raw material are nontoxic, free from environmental pollution, every environmental protection index
Determine and be up to state standards through environmental administration, while making the wearability of metal surface, corrosion resistance and mechanical property hardness strong
Degree has raising by a larger margin.
Embodiment
With reference to embodiment, the present invention is described further, as described below, is only the preferable implementation to the present invention
Example, not does the limitation of other forms, any those skilled in the art are possibly also with the disclosure above to the present invention
Technology contents be changed to the equivalent embodiment changed on an equal basis.It is every without departing from the present invention program content, according to the present invention
Technical spirit any simple modification that following examples are made or equivalent variations, all fall within protection scope of the present invention.
Embodiment 1
The preparation method of making Nano surface low-alloy steel mould, comprises the following steps：
(1) mould raw material is carried out to smelting cast, rolling successively, low-alloy steel is obtained；
A. cast is smelted：Mould raw material is first carried out to refine at the beginning of electric arc furnaces, then carries out ladle RH processing and LF processing, wherein steel
Argon is carried out 10 minutes with 4atm pressure during bag refining, to be conducive to the floating of impurity to remove；
B. roll：Including all heat-treated, rolling and cooling, wherein all heat-treated is the soaking 5 in 1100 DEG C of heating furnace
Hour, the start rolling temperature of rolling is 1000 DEG C, finishing temperature is 860 DEG C, and mill speed is 4m/s, and cooling velocity is 6 DEG C/s, cold
But the finishing temperature after is 660 DEG C.
(2) low-alloy steel for obtaining step (1) is processed into 40mm × 20mm × 3mm block low-alloy steel mould；
(3) block low-alloy steel mould is subjected to nanosizing processing, nitrogen treatment, oxidation processes, immersion oil processing successively, obtained
To making Nano surface low-alloy steel mould.
A. nanosizing is handled：The low conjunction of the bulk is impacted with 15KHZ frequency for 480W tungsten alloy cutter using power
The surface of golden steel mold；Impact energy produces 600MPA compression；Enable to strengthen to realize nanosizing by impact site,
Nano-micrometre gradient-structure is formed on surface；
B. nitrogen treatment：The block low-alloy steel mould that nanosizing is handled is put into crucible, is heated to 450 DEG C, adds oxygen
Salt dissolving 3kg starts salt dissolving to saline oxide and melted；Base salt is added in crucible by several times again, after heating base salt all melts on salt bath face
Stop adding base salt when being raised to apart from crucible top edge 120mm, add adjustment salt 2kg, 2.5h is run under the conditions of 220 DEG C；
C. oxidation processes：The crucible for cleaning rustless is hung in oxidation furnace, instrument constant temperature puts the workpiece in earthenware at 220 DEG C
Pot, thermocouple abuts sidewall of crucible；Then saline oxide is added in crucible, is added to the 1/3 of crucible height, be then electrified to fusing；The
All fusing is gradually added into saline oxide to the salt once added again later, and suitable number is added every time, and side fusing, side is added, until
Liquid level is increased to untill the crucible top edge 200mm；Salt bath face reaches after the height of requirement that 250 DEG C of insulations make moisture
A large amount of volatilizations, untill liquid level produces calmness completely there is no bubble；Then salt temperature heats up 20 DEG C again, so circulation,
Until temperature is raised to 350 DEG C；
D. immersion oil is handled：Low-alloy steel mould is put into L-AN32# total loss system oil, and (product performs GB443-89 marks
Standard, purchased from Jinan You Run Chemical Co., Ltd.s) middle immersion 2min, then does oil droplet.
Mould raw material in the step (1), is made up of the raw material of following mass percents：C 0.06%, Cr 0.7%,
Si 0.4%, Mn 0.34%, Mo 0.18%, Ni 0.12%, Co 0.06%, Nb 0.06%, W 0.23%, P
0.004%th, S 0.004%, surplus is Fe.
The adjustment salt of nitrogen treatment is made up of the raw material of following weight parts in the step (3)：CO(NH2)242 parts,
Na2CO36 parts, K2CO36 parts, Li2CO35 parts, 9 parts of NaCl, 9 parts of NaCNO, K27 parts of S, LiOH 3%, La2(CO3)3 2
Part, Nd2(CO3)32 parts, Sm2(CO3)32 parts.
The base salt of nitrogen treatment is made up of the raw material of following weight parts in the step (3)：98 parts of KCNO, La2(CO3)3
2 parts, 2 parts of praseodymium oxide, 2 parts of titanium dioxide, 2 parts of terbium sesquioxide.
Nitrogen treatment and the saline oxide of oxidation processes are by 50wt%Na in the step (3)2CO3And 50wt%K2CO3Group
Into.
Embodiment 2
It is substantially the same manner as Example 1, differ only in：The adjustment salt of nitrogen treatment is by following heavy in the step (3)
Measure the raw material composition of part：CO(NH2)242 parts, Na2CO36 parts, K2CO36 parts, Li2CO35 parts, 9 parts of NaCl, 9 parts of NaCNO,
K27 parts of S, LiOH 3%, La2(CO3)33 parts, Nd2(CO3)33 parts.Obtain the making Nano surface low-alloy punching block of embodiment 2
The preparation method of tool.
Embodiment 3
It is substantially the same manner as Example 1, differ only in：The adjustment salt of nitrogen treatment is by following heavy in the step (3)
Measure the raw material composition of part：CO(NH2)242 parts, Na2CO36 parts, K2CO36 parts, Li2CO35 parts, 9 parts of NaCl, 9 parts of NaCNO,
K27 parts of S, LiOH 3%, La2(CO3)33 parts, Sm2(CO3)33 parts.Obtain the making Nano surface low-alloy punching block of embodiment 3
The preparation method of tool.
Embodiment 4
It is substantially the same manner as Example 1, differ only in：The adjustment salt of nitrogen treatment is by following heavy in the step (3)
Measure the raw material composition of part：CO(NH2)242 parts, Na2CO36 parts, K2CO36 parts, Li2CO35 parts, 9 parts of NaCl, 9 parts of NaCNO,
K27 parts of S, LiOH 3%, Nd2(CO3)33 parts, Sm2(CO3)33 parts.Obtain the making Nano surface low-alloy punching block of embodiment 4
The preparation method of tool.
Embodiment 5
It is substantially the same manner as Example 1, differ only in：The base salt of nitrogen treatment is by following weight in the step (3)
The raw material composition of part：98 parts of KCNO, La2(CO3)32 parts, 3 parts of praseodymium oxide, 3 parts of titanium dioxide.Receive on the surface for obtaining embodiment 5
The preparation method of riceization low-alloy steel mould.
Embodiment 6
It is substantially the same manner as Example 1, differ only in：The base salt of nitrogen treatment is by following weight in the step (3)
The raw material composition of part：98 parts of KCNO, La2(CO3)32 parts, 3 parts of praseodymium oxide, 3 parts of terbium sesquioxide.Obtain the surface of embodiment 6
The preparation method of nanosizing low-alloy steel mould.
Embodiment 7
It is substantially the same manner as Example 1, differ only in：The base salt of nitrogen treatment is by following weight in the step (3)
The raw material composition of part：98 parts of KCNO, La2(CO3)32 parts, 3 parts of titanium dioxide, 3 parts of terbium sesquioxide.Obtain the table of embodiment 7
The preparation method of face nanosizing low-alloy steel mould.
Test case 1
Performance test, the measurement side of nitride effective codiffusional layer thickness are carried out to low-alloy steel mould made from embodiment 1-7
Method and standard referring to《GB/T 11354-2005 steel-iron components depth of penetration is determined and microstructure examination》, test result is shown in Table
1。
Table 1：The performance test results table
Claims (3)
1. a kind of preparation method of making Nano surface low-alloy steel mould, it is characterised in that comprise the following steps：
(1) mould raw material is carried out to smelting cast, rolling successively, low-alloy steel is obtained；
(2) low-alloy steel is processed, obtains low-alloy steel mould；
(3) low-alloy steel mould is carried out to nanosizing processing, nitrogen treatment, oxidation processes, immersion oil processing successively, obtains to surface and receives
Riceization low-alloy steel mould；
Mould raw material in the step (1), is made up of the raw material of following mass percents：C 0.02-0.08%, Cr 0.5-
0.9%th, Si 0.1-0.6%, Mn 0.33-0.38%, Mo 0.17-0.24%, Ni 0.05-0.15%, Co 0.02-
0.08%th, Nb 0.05-0.08%, W 0.15-0.35%, P 0.002-0.008%, S 0.002-0.008%, surplus is Fe；
The adjustment salt of nitrogen treatment is made up of the raw material of following weight parts in the step (3)：CO(NH2)230-50 parts, Na2CO3
4-8 parts, K2CO34-10 parts, Li2CO33-7 parts, 5-15 parts of NaCl, 5-15 parts of NaCNO, K25-15 parts of S, LiOH 2-5%,
La2(CO3)31-5 parts, Nd2(CO3)31-5 parts, Sm2(CO3)31-5 parts.
2. the preparation method of making Nano surface low-alloy steel mould as claimed in claim 1, it is characterised in that：The step
(3) the base salt of nitrogen treatment is made up of the raw material of following weight parts in：95-105 parts of KCNO, La2(CO3)31-5 parts, praseodymium oxide
1-5 parts, 1-5 parts of titanium dioxide, 1-5 parts of terbium sesquioxide.
3. the preparation method of making Nano surface low-alloy steel mould as claimed in claim 1, it is characterised in that：The step
(3) nitrogen treatment and the saline oxide of oxidation processes are by 40-60wt%Na in2CO3And 40-60wt%K2CO3Composition.
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| JP3566162B2 (en) * | 1999-12-24 | 2004-09-15 | 山陽特殊製鋼株式会社 | Hot tool steel with excellent weldability |
| CN101693981B (en) * | 2009-10-23 | 2011-04-06 | 燕山大学 | Preparation method of low-alloy high-carbon steel with high-strength and high ductility nano structure |
| JP6191118B2 (en) * | 2011-11-18 | 2017-09-06 | 大同特殊鋼株式会社 | Mold steel with excellent thermal conductivity, mirror polishability and toughness |
| CN104878300B (en) * | 2015-05-15 | 2017-08-04 | 河冶科技股份有限公司 | Injection shaping high tenacity tool steel |
| CN105002436A (en) * | 2015-06-30 | 2015-10-28 | 上海瀚氏模具成型有限公司 | Preparation method of surface nanocrystallization low-alloy steel mold |
| CN104946994B (en) * | 2015-06-30 | 2017-01-25 | 上海瀚氏模具成型有限公司 | Preparation method for nano-crystallization low-alloy heat-resistant high-strength steel mould |
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