CN109504847A - Low-cost plastic die steel and preparation method thereof - Google Patents
Low-cost plastic die steel and preparation method thereof Download PDFInfo
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- CN109504847A CN109504847A CN201811480289.6A CN201811480289A CN109504847A CN 109504847 A CN109504847 A CN 109504847A CN 201811480289 A CN201811480289 A CN 201811480289A CN 109504847 A CN109504847 A CN 109504847A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 229920003023 plastic Polymers 0.000 title claims abstract description 34
- 239000004033 plastic Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 3
- 238000003723 Smelting Methods 0.000 claims abstract 2
- 238000002791 soaking Methods 0.000 claims description 9
- 239000004615 ingredient Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 12
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 23
- 239000011651 chromium Substances 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000005275 alloying Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000005496 tempering Methods 0.000 description 6
- 229910001214 P-type tool steel Inorganic materials 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
-
- 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a low-cost plastic die steel and a preparation method thereof, wherein the die steel comprises the following components in percentage by weight: 0.15% -0.25%, Si: 0.40-0.80%, Mn: 1.60% -2.80%, Cr: 1.50 to 2.00 percent of Fe, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 4.3 to 5.0 percent of Si + Mn + Cr, 2.3 to 3.5 percent of Si + Mn, and the balance of Fe and inevitable impurities. The full-thickness homogeneity degree of the die steel is within 3HRC, and the transverse and longitudinal impact ratio can reach 0.84-0.87; the preparation method comprises smelting, casting, heating, rolling and heat treatment; the plastic die steel produced by the method has higher hardness which can reach 37-40HRC, and the full-thickness homogeneity degree reaches 3 HRC; has excellent isotropic performance.
Description
Technical field
The invention belongs to the plastic die steels and its preparation of metal material production technical field more particularly to a kind of low cost
Method.
Background technique
All kinds of molds are as basic technological equipment, the height of production technology level, it has also become measure a national product
The one of the important signs that of manufacture level height.China's die industry will to it is large-scale, accurate, complicated, efficiently, long-life and multi-functional
Direction is developed.In recent years, China's die & mold development is rapid, and yield has leaped into the front ranks of the world, wherein account for main body be plastics at
Shape mold.But the raw material metals price such as Mo, Ni, V rises violently, and causes the price of plastic die steel also constantly soaring therewith.It opens
The plastic die steel of hair low-cost and high-performance is of great significance for mold manufacturing enterprise.
Existing patented technology and document about plastic die steel is more.Invention is " at a kind of pre-hardening of plastic die steel
Reason method " plastic mould steel chemical composition percentage disclosed in (CN101805820A) are as follows: C 0.36, Si 0.52, Mn 0.86,
P 0.014, S 0.003, Cr 1.74, Mo 0.36.Invention " a kind of pre-hardened plastic mold steel and its manufacturing method "
(CN102899571A) the pre-hardened plastic mold steel chemical component percentage disclosed in are as follows: C 0.35-0.45, Si 0.25-
0.35, Mn 1.30-1.80, Cr 1.5-2.0, Mo 0.1-0.3, V 0.04-0.12, P≤0.02, S≤0.008.Invention " one
The production method of kind of easy cutting plastic mold steel plate " plastic mould steel chemical composition percentage disclosed in (CN103556065A)
Are as follows: C 0.35-0.45, Si 0.25-0.35, Mn 1.50-1.60, P≤0.008, S 0.05-0.10, Als 0.010-
0.045, Cr 1.80-2.00, Mo 0.15-0.20.Invention " a kind of high tougness die steel for plastics and its production method "
(CN103710625A) pre-hardened plastic mold steel chemical component percentage disclosed in are as follows: C 0.30-0.42, Si 0.20-
0.50, Mn 0.75-1.00, Cr 1.50-2.00, Mo 0.25-0.50, S≤0.015, P≤0.025, Als 0.010-
0.040, remaining is Fe and inevitable impurity.Invention " a kind of economical plastic steel plate for die and its manufacturing method "
(CN106811687A) the chemical component percentage of plastic die steel disclosed in are as follows: C 0.40-0.50, Si 0.40-0.70, Mn
1.10-1.50, Cr 0.60-0.80, Mo 010-0.20, B 0.001-0.0012, P < 0.020, S < 0.015, surplus Fe
And inevitable impurity.
Containing the valuable of 0.1~0.5% different content in the above chemical component for inventing related plastic die steel
Metal Mo and V etc., cost of alloy are high.
" bainite pre-hardened plastic mold steel and its preparation and the heat treatment method " of patent CN102650021A application is adopted
With multiway forging hot-working；It is cooling that air-cooled+air-cooled mode is carried out again；Most laggard tempering heat treatment, the production cycle is longer, efficiency
It is low, while production cost is greatly improved using forging, normalizing, tempering.
Patent CN104294159A " a kind of novel plastic mould steel and its preparation and heat treatment process " is heated using breaking down,
Spheroidizing, the interior preheating of vacuum drying oven, Quench heating, then oily cold or air cooling, the production technology of continuous tempering three times, energy
Source consumption is big, high process cost.
Patent CN107587075A " inexpensive plastic die steel and its production method " is although without precious metal Mo, Ni etc.
Element, but use normalized treatment and tempering technique to steeply rise cost after rolling.
Document " tissue of economical P20 plastic die steel and hardness research " (Si Songhua etc., heat treatment, 2010,5 (21):
Online initial curing process 31-34) is used, but as plate thickness increases, hardness fluctuations are larger.
It can be seen from the above, existing plastic die steel exists, cost of alloy is high or complex process or performance deficiency etc. lack
Point.Therefore, researching and developing while having both low cost and high performance plastic die steel has certain challenge for Die Industry.
Summary of the invention
It is an object of the invention to overcome the above problem and plastic die steel that is insufficient and providing a kind of low cost and its life
Production method, this kind of plastic die steel have excellent performance and low in cost, shorten the production cycle.
What the object of the invention was realized in:
A kind of plastic die steel of low cost, the ingredient of the mould steel are as follows by weight percentage: C:0.15%~
0.25%, Si:0.40%~0.80%, Mn:1.60%~2.80%, Cr:1.50%~2.00%, P≤0.015%, S≤
0.015%, and Si+Mn+Cr=4.3%~5.0%, Si+Mn=2.3%~3.5%, surplus are Fe and inevitable impurity.
Within mould steel through thickness homogeneity 3HRC, transverse and longitudinal impacts ratio up to 0.84-0.87.
It is as follows that present component designs reason:
C: a part participates in solution strengthening, and a part forms carbide with alloying element and participates in precipitation strength.The main shape of carbon
At carbide.To reduce the carbon equivalent of steel, reducing the flame gas cutting sensibility of steel, need to reduce carbon content.But carbon content is too low,
It will be unfavorable for the acquisition of bainite structure, the hardness of steel will not be able to guarantee, when carbon content is excessively high, can make carbide inhomogeneities
Increase, seriously affects its toughness.For the comprehensive performance for guaranteeing this kind of plastic die steel, the present invention select to be added carbon content for
0.15%~0.25%.
Si: carry out that displacement solution strengthening is highly effective, and displacement solution strengthening generally causes the spherical symmetry of iron to ferrite
Distortion, it can generate elastic interaction with edge dislocation.The solid solution of Si makes the lattice constant of ferrite matrix become smaller, atom
Radius 0.118nm, α-Fe are 0.126nm, it can be seen that, the solid solution alloy element for reducing lattice constant has relatively effective strong
Change effect.Si is also the effective element for improving resistance to tempering.Si reduces diffusion velocity of the carbon in ferrite, precipitation when making to be tempered
Carbide be not easy to assemble, increase temper resistance.The ε-carbide of tempered martensite and matrix can be made to keep coherence and uniformly divide
Cloth makes tempered martensite maintain good combination of strength and toughness.But Si reduces the toughness and plasticity of steel to a certain extent, because
This, to obtain good combination of strength and toughness, the present invention selects that Si content is added to be 0.40%~0.80%.
Mn: property and shape that steel is formed by oxide in solidification be can change.It and S have biggish affinity simultaneously
Power, can to avoid on crystal boundary formed low melting point sulfide FeS, and with the MnS of certain plasticity exist, to eliminate sulphur
Adverse effect, improve the hot-working character of steel.Mn has solution strengthening effect, to improve the intensity of ferrite and austenite
And hardness.Manganese is weak carbide formation element, it is solvable enter cementite in formed alloyed cementite (Fe, Mn)3C, formation can
The free energy of reduction system tends to more stable state.Manganese dissolves in austenite the harden ability that can strongly increase steel, while strong
Lower the Ms point of steel.To obtain good combination of strength and toughness, the present invention uses the alloy design philosophy of low-carbon high-manganese, present invention choosing
Selecting and Mn content is added is 1.60%~2.80%.
Cr: chromium can increase the harden ability of steel, improve temper resistance, and generate post-curing phenomenon；Chromium be in strong carbon
Compound formation element can form carbide with carbon in steel, also dissolve in solid solution and Fe3In C, chromium is to the wear-resistant of steel
Property, elevated temperature strength, hot hardness, toughness have favorable influence, while it dissolves in matrix the corrosion resistance that can significantly improve steel
Energy.But when too high levels, microstructure coarsening can be made, therefore, the present invention selects that Cr content is added to be 1.50%~2.00%.
Studies have shown that obtaining structural difference under certain austenitizing condition and certain cooling velocity and mainly depending on
The content of Yu Gangzhong carbon and alloying element.The decisive ingredient for influencing martensite hardness is carbon, and alloys producing very little can
To say that the hardenability of martensite is mainly to be determined by carbon.But the hardness of bainite be then have with carbon and alloying element content compared with
Important Relations.Wherein than more prominent, the effect of carbon is small more than to martensite for the effect of silicon.Therefore, intensity and toughness are equal in order to obtain
Excellent final performance need to be controlled being used cooperatively for alloying element.For save cost of alloy, the present invention be not added Mo,
The alloying element of the higher costs such as Ni, V gives full play to the mutually matched work of Si, Mn, Cr using the design philosophy of low C high Mn
With being similarly obtained the plastic steel plate for die haveing excellent performance, therefore Si+Mn+Cr=4.3%~5.0% in the present invention, Si+Mn=
2.3%~3.5%.
P, S: facilitate the improvement of machinability.If content excessively will lead to macrosegregation, the homogeneous of steel is influenced
Property and degree of purity, but consider production cost, the present invention select be added P≤0.015%, S≤0.015%.
The two of technical solution of the present invention are to provide a kind of preparation method of the plastic die steel of low cost, including smelt, pour
Casting, heating, rolling, heat treatment；
The molten steel completed will be smelted and be cast into steel billet；Steel billet is put into heating furnace and is heated, heating process was divided into for three stages,
First stage: 670 DEG C~730 DEG C, heating rate 60~100 DEG C/h, 1~2.5h of soaking time, second stage: 1170 DEG C~
1230 DEG C, heating rate 60~100 DEG C/h, 2.5~4.5h of soaking time, the phase III: 1210 DEG C~1250 DEG C, heating rate
60~100 DEG C/h, 5~8h of soaking time；Heating cycle of the invention facilitates alloying element and is sufficiently dissolved, and improves slab center
Alloying elements distribution, effectively mitigation degree of segregation.Steel billet after heating obtains the steel plate of 20-120mm specification through multi- pass rolling,
1150~1250 DEG C of start rolling temperature, preceding two percentage pass reduction rolls rate control in 10-20r/min, finish to gauge in 15%-25%
950~1050 DEG C of temperature.It can make this kind of plastic die steel central part that fully deformed occur using the big soft reduction process of low speed, promote
Hole diffusion, engagement, are conducive to the abatement of hole, prevent the generation of defect.It is carried out by the way of air-cooled after steel plate is offline cold
But to 600 DEG C -650 DEG C, in wrapping up energy-saving heat preserving cotton within the scope of 570 DEG C -620 DEG C on the steel plate, heat-preservation cotton is reusable, protects
Warm 5-7h makes steel plate generate " self tempering " effect, and energy conservation and environmental protection, steel plate is made to reach good using the release of steel plate self heat
Performance.
The beneficial effects of the present invention are:
1, it is not added with the higher metallic element of the cost of alloy such as Mo, Ni, V, with the alloy design philosophy of low C high Mn, is passed through
The interaction of Si, Mn, Cr alloying element, obtains a kind of simple production process, period short plastic die steel；
2, this kind of plastic die steel has higher hardness, and up to 37-40HRC, through thickness homogeneity reaches 3HRC；
3, with excellent equal orientation performance, transverse and longitudinal impact ratio is up to 0.84-0.87.As it can be seen that this kind of plastic die steel
Hardness, toughness, equal orientation performance be superior to 3Cr2Mo steel.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention is smelted, is cast, is heated, is rolled, is heat-treated according to the component proportion of technical solution.It will
It smelts the molten steel completed and is cast into steel billet；Steel billet is put into heating furnace and is heated, heating process was divided into for three stages, the first stage:
670 DEG C~730 DEG C, heating rate 60~100 DEG C/h, 1~2.5h of soaking time, second stage: 1170 DEG C~1230 DEG C, heating
Speed 60~100 DEG C/h, 2.5~4.5h of soaking time, the phase III: 1210 DEG C~1250 DEG C, 60~100 DEG C of heating rate/
H, 5~8h of soaking time；Steel billet after heating obtains the steel plate of 20-120mm specification through multi- pass rolling, and start rolling temperature 1150~
1250 DEG C, preceding two percentage pass reduction rolls rate control in 10-20r/min, finishing temperature 950~1050 in 15%-25%
℃；It carries out being cooled to 600 DEG C -650 DEG C by the way of air-cooled after steel plate is offline, in 570 DEG C of -620 DEG C of range inside holding 5-7h.
The ingredient of steel of the embodiment of the present invention is shown in Table 1.The heating technique parameter of steel of the embodiment of the present invention is shown in Table 2.Steel of the embodiment of the present invention
Rolling and heat treatment main technologic parameters are shown in Table 3.The Rockwell hardness of steel of the embodiment of the present invention is shown in Table 4.Steel of the embodiment of the present invention
Equal orientation performance is shown in Table 5.
The ingredient (wt%) of 1 steel of the embodiment of the present invention of table
| Embodiment | C | Si | Mn | Cr | P | S | Si+Mn+Cr | Si+Mn |
| 1 | 0.15 | 0.60 | 2.80 | 1.60 | 0.015 | 0.015 | 5 | 3.4 |
| 2 | 0.20 | 0.50 | 2.50 | 2.00 | 0.013 | 0.014 | 5 | 3 |
| 3 | 0.25 | 0.80 | 1.60 | 1.90 | 0.010 | 0.011 | 4.3 | 2.4 |
| 4 | 0.18 | 0.40 | 1.92 | 1.98 | 0.012 | 0.013 | 4.3 | 2.32 |
| 5 | 0.21 | 0.75 | 2.40 | 1.83 | 0.013 | 0.010 | 4.98 | 3.15 |
| 6 | 0.17 | 0.73 | 2.74 | 1.50 | 0.014 | 0.015 | 4.97 | 3.47 |
| 7 | 0.22 | 0.67 | 2.63 | 1.70 | 0.012 | 0.012 | 5 | 3.3 |
| 8 | 0.24 | 0.70 | 1.71 | 1.89 | 0.009 | 0.014 | 4.3 | 2.41 |
The heating technique parameter of 2 steel of the embodiment of the present invention of table
The rolling and heat treatment main technologic parameters of 3 steel of the embodiment of the present invention of table
The Rockwell hardness of 4 steel of the embodiment of the present invention of table
The equal orientation performance of 5 steel of the embodiment of the present invention of table
In order to state the present invention, explanation appropriately and is being sufficiently carried out to the present invention by embodiment among the above, it is above
Embodiment is merely to illustrate the present invention, and not limitation of the present invention, those of ordinary skill in related technical field, not
In the case where being detached from the spirit and scope of the present invention, it can also make a variety of changes and modification, made any modification are equally replaced
It changes, improve, should all be included in the protection scope of the present invention, scope of patent protection of the invention should be limited by claim
It is fixed.
Claims (3)
1. a kind of plastic die steel of low cost, which is characterized in that the ingredient of the mould steel is as follows by weight percentage: C:
0.15%~0.25%, Si:0.40%~0.80%, Mn:1.60%~2.80%, Cr:1.50%~2.00%, P≤
0.015%, S≤0.015%, and Si+Mn+Cr=4.3%~5.0%, Si+Mn=2.3%~3.5%, surplus is for Fe and not
It can avoid impurity.
2. a kind of plastic die steel of low cost according to claim 1, which is characterized in that the mould steel through thickness homogeneity
Within 3HRC, transverse and longitudinal impacts ratio up to 0.84-0.87.
3. a kind of a kind of preparation method of the plastic die steel of low cost of any of claims 1 or 2, including smelting, casting, add
Heat, rolling, heat treatment；It is characterized by:
The molten steel completed will be smelted and be cast into steel billet；Steel billet is put into heating furnace and is heated, heating process was divided into for three stages, and first
Stage: 670 DEG C~730 DEG C, heating rate 60~100 DEG C/h, 1~2.5h of soaking time, second stage: 1170 DEG C~1230
DEG C, heating rate 60~100 DEG C/h, 2.5~4.5h of soaking time, the phase III: 1210 DEG C~1250 DEG C, heating rate 60~
100 DEG C/h, 5~8h of soaking time；Steel billet after heating obtains the steel plate of 20-120mm specification, start rolling temperature through multi- pass rolling
1150~1250 DEG C, preceding two percentage pass reduction rolls rate control in 10-20r/min in 15%-25%, and finishing temperature 950~
1050℃；It carries out being cooled to 600 DEG C -650 DEG C by the way of air-cooled after steel plate is offline, in 570 DEG C of -620 DEG C of range inside holdings
5-7h。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811480289.6A CN109504847B (en) | 2018-12-05 | 2018-12-05 | Low-cost plastic die steel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811480289.6A CN109504847B (en) | 2018-12-05 | 2018-12-05 | Low-cost plastic die steel and preparation method thereof |
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| Publication Number | Publication Date |
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| CN109504847A true CN109504847A (en) | 2019-03-22 |
| CN109504847B CN109504847B (en) | 2020-09-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481357A (en) * | 2021-06-30 | 2021-10-08 | 江苏省沙钢钢铁研究院有限公司 | Plastic die steel plate and production method thereof |
| CN113512681A (en) * | 2021-06-30 | 2021-10-19 | 江苏省沙钢钢铁研究院有限公司 | Plastic die steel plate and production method thereof |
| CN114892094A (en) * | 2022-05-31 | 2022-08-12 | 宝武集团鄂城钢铁有限公司 | Pre-hardened mirror plastic die steel and production method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481357A (en) * | 2021-06-30 | 2021-10-08 | 江苏省沙钢钢铁研究院有限公司 | Plastic die steel plate and production method thereof |
| CN113512681A (en) * | 2021-06-30 | 2021-10-19 | 江苏省沙钢钢铁研究院有限公司 | Plastic die steel plate and production method thereof |
| WO2023272873A1 (en) * | 2021-06-30 | 2023-01-05 | 江苏省沙钢钢铁研究院有限公司 | Plastic mold steel plate and production method therefor |
| EP4365317A4 (en) * | 2021-06-30 | 2024-10-16 | Institute Of Res Of Iron And Steel Jiangsu Province/Sha Steel Co Ltd Cn | Plastic mold steel plate and production method therefor |
| CN114892094A (en) * | 2022-05-31 | 2022-08-12 | 宝武集团鄂城钢铁有限公司 | Pre-hardened mirror plastic die steel and production method thereof |
| CN114892094B (en) * | 2022-05-31 | 2023-03-03 | 宝武集团鄂城钢铁有限公司 | Pre-hardened mirror plastic die steel and production method thereof |
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| CN109504847B (en) | 2020-09-01 |
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