CN103981455B - A kind of superstrength die steel with good corrosion resistance and toughness - Google Patents
A kind of superstrength die steel with good corrosion resistance and toughness Download PDFInfo
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- CN103981455B CN103981455B CN201410194383.0A CN201410194383A CN103981455B CN 103981455 B CN103981455 B CN 103981455B CN 201410194383 A CN201410194383 A CN 201410194383A CN 103981455 B CN103981455 B CN 103981455B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 230000007797 corrosion Effects 0.000 title claims abstract description 15
- 238000005260 corrosion Methods 0.000 title claims abstract description 15
- 238000005242 forging Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 18
- 238000007670 refining Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910001566 austenite Inorganic materials 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 241001062472 Stokellia anisodon Species 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 244000309464 bull Species 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 3
- 239000011651 chromium Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
There is a superstrength die steel for good corrosion resistance and toughness, it is characterized in that: be made up of the chemical composition of following weight percentage: C:0.08 ~ 0.32%; Si :≤0.8%; Mn :≤0.5%; Cr:5 ~ 10%; Ni:6.0 ~ 8.0%; Co:1.3-1.8%; W:0.9 ~ 1.1%; V:0.2 ~ 0.5%; Nb:0.08 ~ 0.15%; N :≤0.002%; O :≤0.0015; Mo:0.9-1.4%, Ti:0.05-0.4%, S:0.011 ~ 0.025%, all the other are Fe and other inevitable impurity, and die steel of the present invention can be widely used in the Industrial Steels such as the automobile industry of requirement high strength and toughness through processing means such as forgings.
Description
Technical field
The present invention relates to metallurgical technology field, particularly relate to a kind of superstrength die steel and the manufacture method thereof with good corrosion resistance and toughness.
Background technology
Steel is purposes the most a kind of material in all metals, in industrial circle widespread uses such as aviation, nuclear energy, naval vessel, petrochemical industry, develops in recent years to the civil area such as communications and transportation (automobile, train), kitchen utensils, household electrical appliance, building decoration.Therefore, the performance of steel and the living safety of people closely related.At present, the exploitation of automotive industry steel is mainly devoted to the intensity of raising steel and is kept its plasticity.The development trend of automobile light weight, safety, less energy-consumption to steel products in kind, specification, propose higher requirement qualitatively.The new designing concept of light, the impact-resistant transportation means system of research and development quality requires the material that mining inetesity is high, plasticity good and energy absorption capability is excellent, specific mass is light.Improve the weight (meeting energy-conserving and environment-protective demand) that intensity can alleviate automobile, plasticity improves the demand that then can meet the design of complicated vehicle and improve driving safety performance.
High-strength stainless steel owing to having high strength and good corrosion resistance simultaneously, and is widely used in the fields such as aerospace, medicine equipment, oil drilling equipment, light weapons and ocean application.But in the last few years, along with improving constantly some important feature part performance requriementss of aerospace, the intensity of high-strength stainless steel, the requirement of toughness are also improved thereupon.The stainless steel grade of practicality at present with superstrength and high tenacity coupling is less.Domestic use more, representative high-strength stainless steel has 17-4PH, 15-5PH and PH13-8Mo etc., although they have higher corrosion resistance nature, intensity or toughness on the low side.Therefore, superstrength (Rm >=1900MPa), and the stainless steel with good plasticity and toughness (A >=15%) also exists application prospect widely in national defence leading-edge fields such as aerospace.
Conventional plastic die steel has the shortcomings such as the cost that high alloy content brings is higher, technical process is long.The many flexible steel grades from import or domestic production of Plastics in China die steel industry steel, the trade mark as Japan NAK80,718 of Sweden, the P20 etc. of the U.S., alloy content is higher, and steel plate cost value rises.And above-mentioned several import steel price is general very high.
Along with the fast development of plastic die steel processing industry, mold manufacturing industry is to its material requirements: one is the high quality of material, and two is low costs of material.But because steel plate delivery date that market provides is longer, wide narrower, the on the high side specification limit of plate of material is narrower, cannot meet the demand of increasingly competitive die steel processing industry.
Summary of the invention
The object of this invention is to provide a kind of superstrength die steel with good corrosion resistance and toughness that can overcome above-mentioned defect, excellent working performance.
There is a superstrength die steel for good corrosion resistance and toughness, it is characterized in that: be made up of the chemical composition of following weight percentage: C:0.08 ~ 0.32%; Si :≤0.8%; Mn :≤0.5%; Cr:5 ~ 10%; Ni:6.0 ~ 8.0%; Co:1.3-1.8%; W:0.9 ~ 1.1%; V:0.2 ~ 0.5%; Nb:0.08 ~ 0.15%; N :≤0.002%; O :≤0.0015; Mo:0.9-1.4%, Ti:0.05-0.4%, S:0.011 ~ 0.025%, all the other are Fe and other inevitable impurity.
There is a manufacture method for the superstrength die steel of good corrosion resistance and toughness, comprise the following steps:
1) vacuum induction melting; 2) injecting electrode is watered; 3) consumable electrode vacuum furnace remelting; 4) high-temperature homogenization diffusion; 5) forging is become a useful person; 6) solution treatment; 7) anneal; 8) dual ageing treatment, described melting step comprises: adopt uhp electric arc furnace to smelt, choose fine steel grade, element except Cr, Ni is loaded crucible, crucible is preheated to 400 ~ 600 DEG C, and is evacuated to≤2.7Pa, melt with the burn-off rate of 5 ~ 10kg/min, after fine melt, carry out refining with the temperature of 1560 ~ 1600 DEG C, the hold-time is at 60 ~ 90min; Add Cr, Ni, melt with the burn-off rate of 5 ~ 10kg/min, after Cr, Ni fine melt, again carry out refining with the temperature of 1560 ~ 1600 DEG C, refining time controls at 20 ~ 30min, and phase melting period adopts large quantity of slag stream slag operation, vacuum decarburization; Then send in LF refining furnace and carry out refining, quick deoxidation, according to de-S situation, fine setting Mn, Mo, Cr, V content, adjusts Ti before bull ladle; Heating rolling step: steel billet heats at continuous oven, Heating temperature 1200-1270 DEG C, rate of heating 10-12cm/min; Adopt the controlled rolling of I type, i.e. austenite recrystallization district controlled rolling, select high temperature low speed, depress rolling greatly, finishing temperature≤950 DEG C, grow up to reduce austenite grain size as far as possible; Tempering and Hardness Surveillance step: tempering temperature is 480-570 DEG C, heat insulating coefficient is 4-5min/mm, and on-the-spot Hardness Surveillance obtains qualified finished product.
The principle of foregoing invention technical scheme is: count to by the percent mass improving chromium the high-temperature oxidation resistance that 8-12% improves steel, adjustment carbon content forms carbonitride dispersion-strengthened with interpolation nitrogen element and ensures hot strength mutually, and improves the critical temperature Ac1 of steel by the proportioning of optimized alloy element.After finished heat treatment, the tissue of steel, by lath-shaped tempered martensite, it is uniform-distribution with stable high density carbon nitride diffusion phase, thus has high hot strength.High hot strength and high critical temperature, make steel of the present invention have good thermal fatigue resistance.
Carbon: reduce critical temperature A
c1, promote M
23c
6(M refers to the metallic elements such as Cr, Fe) type Carbide Precipitation, suppresses carbonitride to be separated out with dispersion pattern, is unfavorable for the raising of hot strength and thermal fatigue resistance.Therefore, in steel of the present invention, the mass percent of carbon controls between 0.08 ~ 0.32%;
Nitrogen: be combined with carbon, niobium, v element and form MX(M and refer to the metallic elements such as V, Nb, X refers to C and N) type carbonitride strengthening phase.Nitrogen content is too high, is easy to form thick carbonitride phase, is unfavorable for improving hot strength, and too low being not enough to again forms enough carbonitride strengthening phases.Therefore, nitrogen in steel of the present invention mass percent control be less than 0.002%.
Chromium: improve solidity to corrosion and oxidation-resistance, but form a large amount of δ-ferrite when too high chromium content can cause finished heat treatment to heat, be unfavorable for the raising of hot strength.Therefore, in steel of the present invention, the mass percent of chromium controls between 5 ~ 10%.
Cobalt: austenite former, plays a part to suppress δ-ferrite to be formed, but does not reduce the critical temperature of steel.But expensive because of cobalt, uses as far as possible less.Therefore, in steel of the present invention, the mass percent of cobalt controls between 1.3 ~ 1.8%.
Molybdenum and tungsten: solution strengthening element, improve the hot strength of steel, is also improved the hardening capacity of steel simultaneously and prevents the effect of temper brittleness.But too high levels, can promote δ-ferritic formation.Therefore, in steel of the present invention, the mass percent of molybdenum and tungsten controls respectively between 0.9 ~ 1.4% and 0.9 ~ 21.1%.
Embodiment
The chemical composition (wt.%) of embodiment 1-3 invention steel
| Embodiment | C | Si | Mn | Cr | Ni | W | V | Nb | N | Co | Mo | O |
| 1 | 0.08 | 0.03 | 0.02 | 12.30 | 5.00 | 0.90 | 0.20 | 0.08 | 0.0015 | 1.30 | 0.9 | 0.0012 |
| 2 | 0.20 | 0.50 | 0.01 | 10.05 | 8.00 | 1.00 | 0.30 | 0.10 | 0.0014 | 1.50 | 1.10 | 0.0011 |
| 3 | 0.32 | 0.80 | 0.05 | 11.13 | 10.1 | 1.10 | 0.50 | 0.15 | 0.0019 | 1.80 | 1.40 | 0.0014 |
1) vacuum induction melting; 2) injecting electrode is watered; 3) consumable electrode vacuum furnace remelting; 4) high-temperature homogenization diffusion; 5) forging is become a useful person; 6) solution treatment; 7) anneal; 8) dual ageing treatment, described melting step comprises: adopt uhp electric arc furnace to smelt, choose fine steel grade, element except Cr, Ni is loaded crucible, crucible is preheated to 400 ~ 600 DEG C, and is evacuated to≤2.7Pa, melt with the burn-off rate of 5 ~ 10kg/min, after fine melt, carry out refining with the temperature of 1560 ~ 1600 DEG C, the hold-time is at 60 ~ 90min; Add Cr, Ni, melt with the burn-off rate of 5 ~ 10kg/min, after Cr, Ni fine melt, again carry out refining with the temperature of 1560 ~ 1600 DEG C, refining time controls at 20 ~ 30min,
Melting step: adopt uhp electric arc furnace to smelt, choose fine steel grade, melting period adopts large quantity of slag stream slag operation, vacuum decarburization; Then send in LF refining furnace and carry out refining, quick deoxidation, according to de-S situation, fine setting Mn, Mo, Cr, V content, adjusts Ti, B before bull ladle;
(2) heating rolling step:
Heating: heating cycle is pressed II group steel heating process and performed, and steel billet heats at continuous oven, Heating temperature 1200-1270 DEG C, rate of heating 10-12cm/min;
Rolling, dry in the air steel: have employed I type rolling technology, i.e. the controlled rolling of austenite recrystallization district.Select high temperature low speed, depress rolling greatly, finishing temperature≤950 DEG C, grow up to reduce austenite grain size as far as possible.The thick continuously cast bloom of 300mm rolls into 50mm steel plate, and compression ratio is 6;
Do not water after rolling, under carrying out state of nature, air cooling cools, and forbids thermal reactor to be piled up neatly, by the adjustment in alloying constituent, can obtain bainite structure, obtain comparatively ideal original hardness under as air-cooled condition, in order to adjusting between stiffness region by tempering;
(3) tempering and Hardness Surveillance step:
Tempering temperature is 480-570 DEG C, heat insulating coefficient is 4-5min/mm, scene steel plate Leeb Hardness Tester inspection one by one, inspection can represent 5 positions (steel plate 4 bights and position, 5, center) of whole steel plate uniformity of hardness energy, 280-340HB between the stiffness region that final acquisition is consistent, judges that finished product hardness performance is qualified.
(4) dual ageing treatment:
A) by heat steel to 490 ~ 510 DEG C, after insulation 1 ~ 4h, oil cooling is to room temperature;
B) steel are cooled to≤-73 DEG C, after insulation 0.5 ~ 2h, air cooling is to room temperature;
C) by heat steel to 470 ~ 490 DEG C, after insulation 10 ~ 15h, air cooling is to room temperature.
The mechanical property of this case embodiment 1-3
Foregoing; be only preferred embodiment of the present invention; not for limiting embodiment of the present invention; those of ordinary skill in the art are according to central scope of the present invention and spirit; can carry out corresponding flexible or amendment very easily, therefore protection scope of the present invention should be as the criterion with the protection domain required by claims.
Claims (5)
1. there is a superstrength die steel for good corrosion resistance and toughness, it is characterized in that: be made up of the chemical composition of following weight percentage: C:0.08 ~ 0.32%; Si :≤0.8%; Mn :≤0.5%; Cr:5 ~ 10%; Ni:6.0 ~ 8.0%; Co:1.3-1.8%; W:0.9 ~ 1.1%; V:0.2 ~ 0.5%; Nb:0.08 ~ 0.15%; N :≤0.002%; O :≤0.0015; Mo:0.9-1.4%, Ti:0.05-0.4%, S:0.011 ~ 0.025%, all the other are Fe and other inevitable impurity; And the ratio of the content of the content of S and N is 1.50 ~ 6.0, the production method of described high-strength die steel comprises the following steps: 1) vacuum induction melting; 2) injecting electrode is watered; 3) consumable electrode vacuum furnace remelting; 4) high-temperature homogenization diffusion; 5) forging is become a useful person; 6) solution treatment; 7) anneal; 8) dual ageing treatment, described melting step comprises: adopt uhp electric arc furnace to smelt, choose fine steel grade, element except Cr, Ni is loaded crucible, crucible is preheated to 400 ~ 600 DEG C, and is evacuated to≤2.7Pa, melt with the burn-off rate of 5 ~ 10kg/min, after fine melt, carry out refining with the temperature of 1560 ~ 1600 DEG C, the hold-time is at 60 ~ 90min; Add Cr, Ni, melt with the burn-off rate of 5 ~ 10kg/min, after Cr, Ni fine melt, again carry out refining with the temperature of 1560 ~ 1600 DEG C, refining time controls at 20 ~ 30min, and melting period adopts large quantity of slag stream slag operation, vacuum decarburization; Then send in LF refining furnace and carry out refining, quick deoxidation, according to de-S situation, fine setting Mn, Mo, Cr, V content, adjusts Ti before bull ladle; Heating rolling step: steel billet heats at continuous oven, Heating temperature 1200-1270 DEG C, rate of heating 10-12cm/min; Adopt the controlled rolling of I type, i.e. austenite recrystallization district controlled rolling, select high temperature low speed, depress rolling greatly, finishing temperature≤950 DEG C, grow up to reduce austenite grain size as far as possible; Tempering and Hardness Surveillance step: tempering temperature is 480-570 DEG C, heat insulating coefficient is 4-5min/mm, and on-the-spot Hardness Surveillance obtains qualified finished product.
2. there is the superstrength die steel of good corrosion resistance and toughness as claimed in claim 1, it is characterized in that: the weight percent of Co is Co:1.5%.
3. there is the superstrength die steel of good corrosion resistance and toughness as claimed in claim 1, it is characterized in that: the weight percent of Cr is Cr:8%.
4. there is the superstrength die steel of good corrosion resistance and toughness as claimed in claim 1, it is characterized in that: described annealing process is: 800-850 DEG C keeps 1-2h, air cooling.
5. there is the superstrength die steel of good corrosion resistance and toughness as claimed in claim 1, it is characterized in that: the hardness of this steel is between HRC58-63, and toughness is at 17-20J/cm
2between.
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| CN201410194383.0A CN103981455B (en) | 2014-05-09 | 2014-05-09 | A kind of superstrength die steel with good corrosion resistance and toughness |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004169177A (en) * | 2002-11-06 | 2004-06-17 | Daido Steel Co Ltd | Alloy tool steel, its manufacturing method, and die using it |
| CN102131947A (en) * | 2008-07-15 | 2011-07-20 | 奥贝尔&杜瓦尔公司 | Hardened martensitic steel having low cobalt content, process for manufacturing part from this steel, and parts thus obtained |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH036354A (en) * | 1989-06-02 | 1991-01-11 | Res Inst Electric Magnetic Alloys | Damping alloy having high hardness and high damping capacity and its manufacture |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004169177A (en) * | 2002-11-06 | 2004-06-17 | Daido Steel Co Ltd | Alloy tool steel, its manufacturing method, and die using it |
| CN102131947A (en) * | 2008-07-15 | 2011-07-20 | 奥贝尔&杜瓦尔公司 | Hardened martensitic steel having low cobalt content, process for manufacturing part from this steel, and parts thus obtained |
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