CN102703835B - Hot-work die steel for aluminum die-casting mould - Google Patents
Hot-work die steel for aluminum die-casting mould Download PDFInfo
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- CN102703835B CN102703835B CN2012100203492A CN201210020349A CN102703835B CN 102703835 B CN102703835 B CN 102703835B CN 2012100203492 A CN2012100203492 A CN 2012100203492A CN 201210020349 A CN201210020349 A CN 201210020349A CN 102703835 B CN102703835 B CN 102703835B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 44
- 239000010959 steel Substances 0.000 title claims abstract description 44
- 229910052782 aluminium Inorganic materials 0.000 title claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 12
- 238000004512 die casting Methods 0.000 title description 10
- 239000004411 aluminium Substances 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 14
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 14
- 229910052710 silicon Inorganic materials 0.000 abstract description 14
- 229910052721 tungsten Inorganic materials 0.000 abstract description 14
- 229910052758 niobium Inorganic materials 0.000 abstract description 11
- 229910052759 nickel Inorganic materials 0.000 abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 abstract description 10
- 229910052748 manganese Inorganic materials 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 208000037656 Respiratory Sounds Diseases 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 239000010955 niobium Substances 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 description 1
- 229910039444 MoC Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a hot-work die steel. The hot-work die steel consists of the following components in percentage by weight: 0.30 to 0.50 percent of C, 0.80 to 1.20 percent of Si, 1.50 to 1.70 percent of Mn, 4.50 to 5.50 percent of Cr, 1.60 to 2.00 percent of W, 0.10 to 0.30 percent of Mo, 1.60 to 1.80 percent of V, 1.20 to 1.60 percent of Ni, 0.2 to 0.4 percent of Co, 0.5 to 0.7 percent of Nb, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P and the balance of Fe.
Description
Technical field
The present invention relates to ferrous metallurgy technique, particularly a kind of hot-work die steel.
Background technology
As the aluminium die casting, current always the existence cracks the problem of (hot tearing) in cavity surface because of thermal fatigue.This hot tearing refers to following phenomenon: while after die sinking, pouring into a mould water coolant to cavity surface, due to the temperature head between the inside of the cooling and heated condition rapidly of cavity surface, in cavity surface, can produce tensile stress, crack in cavity surface due to the thermal fatigue caused by this repetitive process.For this hot tearing, the hardness that improves mould is favourable.
On the other hand, in recent years, people require to shorten the manufacturing cycle (high circulationization) of aluminum die-cast product.In order to realize this requirement, take the matched moulds time that shortens mould and be purpose, strengthen gradually the water-cooled to the aluminum cast product in mould.The strengthening of this water-cooled, specifically, carry out near cavity surface by making the water-cooled hole.In this situation, produce following problem: the thermal stresses produced at the water-cooled hole surface during aluminum products casting increases, and can produce the phenomenon that starts to crack from the water-cooled hole.
This crackle started from the water-cooled hole, be not merely to cause due to thermal stresses that when casting loads repeatedly, but the compound delayed fracture phenomenon of the crackle caused by thermal stresses and the stress corrosion cracking that caused by the corrosion produced at the water-cooled hole surface.
The crackle that should start from the water-cooled hole, the hardness of mould is more high more easily to be occurred.Therefore, for this crackle started from the water-cooled hole, the hardness that reduces mould is favourable.
That is to say, if raising die hardness, for hot tearing, be favourable, but for the crackle started from the water-cooled hole, be disadvantageous, on the contrary, if reduce die hardness, for the crackle started from the water-cooled hole, be favourable, on the other hand, for hot tearing, be disadvantageous, hot-cracking resistance can worsen.
From suppressing the angle of the above-mentioned crackle started from the water-cooled hole, preferably making die hardness is HRC45～40.
As existing aluminium die casting, mainly use the 5Cr class hot-work die steel as representative with JIS-SKD61.In the last few years, the hot tearing produced in order to be suppressed at cavity surface, made it use hardness to improve gradually, and along with the height circulationization of the manufacture of aluminum die-cast product, the danger that the crackle started from mould water-cooled hole brings increases gradually.In the situation that above-mentioned JIS-SKD61 contains about 0.4% C, the hardness under as-quenched condition, be for example the HRC53 left and right.
Therefore, make its lower hardness to being less than or equal to HRC45 for the purpose for suppressing the crackle start from the water-cooled hole, need to carry out in the annealing be more than or equal under the high temperature of 600 ℃.But, if carry out the annealing under this high temperature, can significantly reduce the erosion resistance of steel.
This material contains about 5% Cr, and it was the good material of erosion resistance originally.But if anneal being more than or equal under the high temperature of 600 ℃, contained Cr is nearly all because this high tempering and as the Cr Carbide Precipitation, the not effect of the corrosive raising of Cr antagonism contained in steel.
In any case, use at present mainly as the aluminium die casting use with the hot-work die steel of JIS-SKD61 as representative, can not solve well the crack problem started from the water-cooled hole.For the crack problem started from the water-cooled hole and the hot tearing problem of cavity surface are all solved well, consider that following methods is effective: preventing the corrosion produced in the water-cooled hole when, reduce the hardness of the mould inside that has the water-cooled hole, improve on the other hand the hardness of the cavity surface of the mould that produces hot tearing.But, meet also no one's proposition of material of this specific character.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to provide a kind of hot-work die steel, and this hot-work die steel has good hot-cracking resistance, and can suppress well the crackle started from the water-cooled hole.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.30～0.50%, and Si 0.80～1.20%, Mn 1.50～1.70%, and Cr 4.50～5.50%, and W 1.60～2.00%, Mo 0.10～0.30%, V 1.60～1.80%, and Ni 1.20～1.60%, Co0.2～0.4%, Nb 0.5～0.7%, S≤0.005%, P≤0.03%, its surplus is Fe.
Preferably, this hot-work die steel is comprised of following component in per-cent (weight): C 0.35～0.45%, and Si 0.90～1.10%, Mn 1.55～1.65%, and Cr 4.80～5.20%, and W 1.70～1.90%, Mo 0.15～0.25%, V 1.65～1.75%, and Ni 1.30～1.50%, and Co 0.25～0.35%, Nb 0.55～0.65%, S≤0.005%, P≤0.03%, its surplus is Fe.
Most preferably, this hot-work die steel is comprised of following component in per-cent (weight): C 0.40%, and Si 1.0%, Mn 1.60%, and Cr 5.0%, and W 1.80%, Mo 0.20%, V 1.70%, and Ni 1.40%, and Co 0.30%, Nb 0.60%, S≤0.005%, P≤0.03%, its surplus is Fe.
What a kind of hot-work die steel Main Components of the present invention scope was determined the reasons are as follows:
C: being the key factor of controlling martensite intensity, is also the principal element that affects toughness.
Si: silicon add hardening capacity and the matrix strength that can improve steel.Silicon is dissolved in α-Fe, makes its strengthening, and improves transition temperature and the high-temperature oxidation resistance that α-Fe changes r-Fe.Silicon is to be insoluble to carbide, but separates out the dispersity of alloy carbide can improve tempering the time; Recent research shows: add appropriate silicon can improve the toughness of steel, the results showed, the silicon amount generally is advisable with 0.8-1.2%.
Mn: except improving hardening capacity, can also eliminate the harmful effect of sulphur.Its content, general control is at 1.5-1.7%.
Chromium Cr: chromium forms carbide, can improve the hardening capacity of steel.While quenching heating, chromium is dissolved in austenite, and after quenching, solid solution, in martensite, can improve the tempering resistance of steel.The results showed, in the present invention, the Cr amount generally is advisable with 4.50～5.50%.
W and Mo: in the hot-work die steel that is added in polynary composite alloying of tungsten, can reduce significantly the thermo-responsive tendency of mistake of steel, and improve the thermostability of steel.But the content of tungsten surpasses 2.0%, and the heat resistance of steel be there will be no obvious raising, toughness is descended.Adding of molybdenum, can improve hardening capacity and the heat resistance of steel, can prevent temper brittleness again.But molybdenum adds too much, can cause the molybdenum carbide segregation, in drawing process, be needle-like or netted separating out along crystal boundary, affect the toughness of steel.
V: vanadium can reduce the thermo-responsive tendency of mistake of steel.
Ni: nickel is non-carbon compound forming element, can improve the hardening capacity of steel.To the strength and toughness of steel, good action is arranged all.
Co and Nb: niobium can form the NbC that stability is very high, in 1050 ℃ have just started to dissolve in austenite, so inhibiting grain growth, can improve heat resistance and high tenacity.Adding of cobalt can significantly improve scale resistance and red hardness (wear resisting property is good).
S and P: by the harmful element that starting material are brought into, belong to the element that as far as possible is controlled at few content range.
Beneficial effect of the present invention is:
Hot-work die steel of the present invention is optimized design to chemical composition, reduce the content of C, adjusted the content of W, Cr, Mo, Co, the crackle that starts from the water-cooled hole in the time of can effectively suppressing to use as pressure cast pattern thus, in addition, also to this die casting, give good hot-cracking resistance.Hot die steel for die-casting of the present invention, be suitable for using as the aluminium die casting die material especially.This is because the present invention, in the low-temperaturetempering that is less than or equal to 500 ℃, obtains being difficult for occurring the hardness that is less than or equal to HRC45 of the crackle started from the water-cooled hole.In addition, by adjusting the content of W, Cr, Mo, Co, when as die casting, using, can be used to the heat of the molten metal (for example molten aluminum) when die casting, make mold cavity surface hardening partly.That is to say, hot die steel for die-casting of the present invention has following effect: the hardness of cavity surface is utilized age hardening and is improved in mould is used.Utilize this effect, can suppress well the hot tearing on cavity surface.
Embodiment
Embodiment mono-
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.30%, and Si 1.20%, Mn 1.50%, and Cr 5.50%, and W 1.60%, Mo 0.30%, V 1.60%, and Ni 1.60%, and Co 0.2%, Nb 0.7%, S≤0.005%, P≤0.03%, its surplus is Fe.
Embodiment bis-
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.50%, and Si 0.80%, Mn 1.70%, and Cr 4.50%, and W 2.00%, Mo 0.10%, V 1.80%, and Ni 1.20%, and Co 0.4%, Nb 0.5%, S≤0.005%, P≤0.03%, its surplus is Fe.
Embodiment tri-
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.35%, and Si 1.10%, Mn 1.55%, and Cr 5.20%, and W 1.70%, Mo 0.25%, V 1.65%, and Ni 1.50%, and Co 0.25%, Nb 0.65%, S≤0.005%, P≤0.03%, its surplus is Fe.
Embodiment tetra-
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.45%, and Si 0.90%, Mn 1.65%, and Cr 4.80%, and W 1.90%, Mo 0.15%, V 1.75%, and Ni 1.30%, and Co 0.35%, Nb 0.55%, S≤0.005%, P≤0.03%, its surplus is Fe.
Embodiment five
A kind of hot-work die steel, this hot-work die steel is comprised of following component in per-cent (weight): C 0.40%, and Si 1.0%, Mn 1.60%, and Cr 5.0%, and W 1.8%, Mo 0.20%, V 1.7%, and Ni 1.4%, and Co 0.3%, Nb 0.6%, S≤0.005%, P≤0.03%, its surplus is Fe.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that namely the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.The person of ordinary skill in the field should understand, any improvement in the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (1)
1. an aluminium transfer mold hot-work die steel, is characterized in that, this hot-work die steel is comprised of following component by weight percentage: C0.40%, Si1.0%, Mn1.60%, Cr5.0%, W1.80%, Mo0.20%, V1.70%, Ni1.40%, Co0.30%, Nb0.60%, S≤0.005%, P≤0.03%, its surplus are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100203492A CN102703835B (en) | 2012-01-19 | 2012-01-19 | Hot-work die steel for aluminum die-casting mould |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100203492A CN102703835B (en) | 2012-01-19 | 2012-01-19 | Hot-work die steel for aluminum die-casting mould |
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| CN102703835A CN102703835A (en) | 2012-10-03 |
| CN102703835B true CN102703835B (en) | 2013-11-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107326294A (en) * | 2016-04-29 | 2017-11-07 | 大连思泰博模具技术有限公司 | Die casting steel |
| CN105970109A (en) * | 2016-06-09 | 2016-09-28 | 广东世创金属科技股份有限公司 | High-performance hot work steel and preparation method thereof |
| CN106756654A (en) * | 2016-11-23 | 2017-05-31 | 江苏雨燕模塑有限公司 | A kind of automobile die manufacture craft |
| CN108380841A (en) * | 2017-09-30 | 2018-08-10 | 湖北川冶科技有限公司 | A kind of die casting proprietary material |
| CN110055475A (en) * | 2019-04-28 | 2019-07-26 | 江苏羽立新材料科技有限公司 | A kind of roll low-phosphorous sulphur rare-earth alloy material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1824822A (en) * | 2006-01-25 | 2006-08-30 | 周向儒 | Die steel and heat treatment technique thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1824822A (en) * | 2006-01-25 | 2006-08-30 | 周向儒 | Die steel and heat treatment technique thereof |
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