CN108774712A - Superelevation thermal conductivity hot stamping die steel and its manufacturing method - Google Patents

Superelevation thermal conductivity hot stamping die steel and its manufacturing method Download PDF

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Publication number
CN108774712A
CN108774712A CN201810643659.7A CN201810643659A CN108774712A CN 108774712 A CN108774712 A CN 108774712A CN 201810643659 A CN201810643659 A CN 201810643659A CN 108774712 A CN108774712 A CN 108774712A
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furnace
stamping die
hot stamping
die steel
thermal conductivity
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周许
孙振环
陈俸军
王兴旺
胡建成
孔财智
姚伟
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Henan Zhongyuan Special Steel Equipment Manufacturing Co Ltd
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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
    • C22C38/02—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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/04—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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

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Abstract

The present invention relates to a kind of superelevation thermal conductivity hot stamping die steel and its manufacturing method, each alloying element mass percent of the steel：C 0.40~0.50%；Si≤0.30%；Cr≤0.30%；Mn 0.80~1.5%；Ni 0.80~1.50%；Mo 1.30~2.0%；V 1.30~2.0%；Micro B；Surplus Fe and other inevitable impurity are electric furnace smelting+vacuum refining+electroslag remelting the invention further relates to its manufacturing method, smelt the uniform ESR ingot of ingredient, and carry out stress relief annealing to ESR ingot；Then forging molding, water cooling+spheroidizing after forging；High temperature quenching and multiple high temp tempering are finally used, obtaining has excellent impact flexibility, the hot stamping die steel of temper resistance and high heat conductance.

Description

Superelevation thermal conductivity hot stamping die steel and its manufacturing method
Technical field
The invention belongs to steel alloy manufacturing process technology field, it is related to a kind of superelevation thermal conductivity hot stamping die steel and its system Make method.
Background technology
With increasingly sharpening for energy crisis and environmental problem, it is sustainable that automotive light weight technology has become World Auto Industry The inevitable road of development.Vehicle body high strengthening can not only mitigate car body weight, but also can improve safety, be to realize that vehicle body is light simultaneously Quantization and the preferred approach for improving crashworthiness.
To meet vehicle body high strengthening growth requirement, advanced high-strength steel and advanced parts forming technology come into being.TRIP The advanced high-strength steel such as steel, TWIP steel are used widely in 1000MPa grades of auto parts and components below are manufactured.However, When intensity reaches 1000MPa grades or more, if carrying out superhigh intensity parts production system using traditional cold punching forming process It makes, it is difficult to avoid that super-high strength steel forming property is poor, part rebound is serious and the technologies such as poor dimensional precision, shaping dies short life are asked Topic.
Hot press-formed technology can not only solve the problems, such as traditional high strength steel cold punching pressing formation difficulty, but also can obtain superhigh intensity And high-precision formation of parts, so as to cause the common concern of industry, and rapidly become the hot technology of automobile manufacturing field.? The 1980s, auto industry began to use heat at technology, and hot forming techniques are widely used to body of a motor car safety zero at present The manufacture of part.
Hot press-formed is that steel plate is heated to 900 DEG C or so austenitizings, is then rapidly feeding the mould of cooling system Tool is interior stamping and quenches, and steel plate tissue is transformed into martensite by austenite, to obtain the part of superhigh intensity.Due to In punching course, mold is in direct contact with blank, and high-temperature metal makes mold cavity surface steep temperature rise, cavity surface layer generate compression, This requires mold materials to have high heat resistance and thermal stability.Simultaneously in pressure maintaining period, the quenching to parts be It is completed in mold with cooling water channel, the heat in cavity is quickly taken away this requires mold, therefore, to hot stamping die The thermal conductivity of steel is more demanding.In order to ensure dimensional accuracy of mold during military service, the thermal expansion of hot stamping die material Coefficient wants sufficiently small.For stamping parts when taking out, mold temperature rapid drawdown easily generates heat fatigue, it is desirable that mold materials have good Fatigue at high temperature drag.During military service, mold is also subjected to great shock loading, and therefore, mold also has with excellent Toughness.In addition to this, mold there is also plucking phenomenon in punching course, this requires hot stamping die material to have enough Hardness.
It is domestic at present generally 4Cr5MoSiV1,4Cr5Mo2V class injection moulding mould steel to be used to be used as drop stamping field, due to Thermal conductivity is relatively relatively low, and mold work beat is slower, and service life is relatively low.
The comparative analysis of the present invention and the prior art：
Keyword by inputting the content of present invention carries out retrieval discovery in China and foreign countries' patent, is related to relevant with this patent The Patent No. of hot stamping die steel and its manufacturing method：
(1) number of patent application：201210081211.3 title：A kind of hot stamping die steel and its manufacturing method, Qi Gehe Gold element mass percent：C 0.43~0.48%；Si 0.3~0.5%；Mn 0.5~0.8%；Cr2.3~2.7%；Mo 1.9~2.4%；V 0.7~1.0%；P≤0.03%；S≤0.03%, remaining is Fe and other inevitable impurity elements.
(2) number of patent application：201210169200.0 title：A kind of superelevation thermal conductivity hot stamping die steel and its system Preparation Method, each alloying element mass percent：C 0.15~0.35%；Si≤0.25%；Mn0.08~0.20%；W 1.0 ~2.0%；Mo 2.0~4.5%；Cr≤0.30%；V≤0.020%；Remaining is Fe and inevitable impurity element, impurity O≤30ppm in element.
(3) number of patent application:CN 201410189168.1, title：A kind of wear-resisting hot stamping die steel of superelevation thermal conductivity and Preparation method, each alloying element mass percent：C 0.33~0.40%；Si≤0.25%；Mn 0.08~0.20%；W 1.0~2.0%；Mo 4.0~5.0%；Cr < 0.30%；V 0.10~0.20%；Remaining is Fe and inevitable impurity member Element, S≤0.01%, P≤0.01%, O≤30ppm in impurity element.
(4) number of patent application：201510386285.4 title：A kind of hot stamping die steel and its production method, Qi Gehe Gold element mass percent：C 0.45~0.50%；Si 0.1~0.3%；Mn 0.1~0.3%；Cr 2.0~2.3%；Mo 2.3~2.5%；V 0.8~1.0%；P≤0.03%；S≤0.03%, remaining is Fe and other inevitable impurity.And it is full Sufficient relational expression：Mo/Cr=1~1.25, V/Cr=0.35~0.43.
Chemically the comparison of ingredient is as can be seen that the chemical composition and patent 1-4 of the present invention are significantly different, and element is to material The performance mechanism of action it is naturally also just different.
Invention content
The object of the present invention is achieved like this：
A kind of superelevation thermal conductivity hot stamping die steel, which is characterized in that its alloying component includes mainly following element, with matter Measure percentage calculation：C 0.40~0.50%；Si≤0.30%；Cr≤0.30%；Mn 0.80~1.5%；Ni 0.80~ 1.50%；Mo 1.30~2.0%；V 1.30~2.0%；Micro B；Surplus Fe and other inevitable impurity.
A kind of manufacturing method of superelevation thermal conductivity hot stamping die steel, which is characterized in that comprise the steps of：
Step 1), electrode billet are smelted：According to superelevation thermal conductivity hot stamping die steel chemical composition and its mass percent：C 0.40~0.50%；Si≤0.30%；Cr≤0.30%；Mn 0.80~1.5%；Ni 0.80~1.50%；Mo 1.30~ 2.0%；V 1.30~2.0%；Micro B；Surplus Fe carries out dispensing, and using eccentric electric arc furnace smelting, intermediate frequency furnace alloy is blended into Refining furnace, external refining are betted as electrode billet；
Step 2), electroslag remelting：Using ternary slag system, CaF2:Al2O3:CaO=65:30:5 mass ratioes, electroslag remelting, and Argon gas protection is carried out, process hydrogenation, oxygenation and nitrogen pick-up is reduced, obtains the ESR ingot of high quality；
Step 3), ESR ingot stress relief annealing：ESR ingot carries out stress relief annealing in gas furnace, according to diameter, 780 At~850 DEG C, soaking time is calculated according to every 100mm heat preservations 1.5h, heat preservation terminates to close flue valve furnace cooling 10h, so Be furnace-cooled to afterwards with≤30 DEG C/h come out of the stove not higher than 150 DEG C it is air-cooled；
Step 4), heating, forging：ESR ingot is put into the heating furnace that furnace temperature is 400~450 DEG C, is added with≤60 DEG C/h Heat keeps the temperature 5~8h to 850 ± 20 DEG C, is then heated to 1200~1250 DEG C with≤150 DEG C/h, keeps the temperature 10~15h, heat preservation knot Shu Caiyong right-angled intersection modes are forged, and final forging temperature is not less than 800 DEG C；
Step 5), forging post-processing：Sink is hoisted to after forging immediately and carries out gap water cooling, is cooled to surface temperature 500~550 DEG C, water cooling terminates 10 minutes surfaces of stagnation and no longer heats up, after then keeping the temperature 10~15h in 830~860 DEG C of stoves, with≤30 DEG C It is cold to be furnace-cooled to 500 DEG C of heaps of coming out of the stove；
Step 6), quenching and high tempering：1080~1140 DEG C of quenchings are heated to, oil cooling is to 80~120 DEG C, by 500 ~600 DEG C of high tempering three times, obtaining has excellent impact flexibility, the hot stamping die of temper resistance and high heat conductance Steel.
Compared with prior art, the present invention has the advantages that following prominent：
The present invention relates to a kind of novel super-high heat-conductive diel Steel materials, in composition design, reduce chromium and silicon member Cellulose content properly increases carbon, manganese, molybdenum, vanadium, and adds appropriate nickel.Under the premise of ensureing material mechanical performance, alloy member is reduced Plain percent of total, to make material that there is the thermal conductivity of superelevation.
Carbon is the essential elements that hardness ensures in material, by properly increasing carbon content to improve material hardness be most economical Design criteria.The design of this steel grade is not added with chromium, and the carbide for forming chromium in hot-working is avoided to influence the performance of material.For Material is made up because increasing toughness caused by carbon content reduces, while material quenching degree caused by being not added with chromium being avoided to decline, On the basis of traditional refractory steel 4Cr5MoSiV1, manganese content is increased to 1.5%, while adding 1.5% nickel and trace B, While ensureing that material obtains high rigidity by oil quenching, there is good impact flexibility.It can be substantially because manganese dissolves in austenite Degree improves the quenching degree of steel.Manganese has solution strengthening effect simultaneously, improves austenite and ferritic intensity and hardness, to extending Property has little effect.Nickel can improve the intensity of steel, and keep good plasticity and toughness.It properly increases molybdenum and v element contains Amount ensures that material obtains enough elevated temperature strengths, high temperature abrasion resistance and fatigue at high temperature drag to 2.0%.Because molybdenum and vanadium are most Good post-curing alloy element, generally in order to generate post-curing effect, it is desirable that the addition of molybdenum is not less than 1.0%, adds Enter the 3.0% available effect close to extreme value, is most economical and effective when addition is 1.3~2.0%.Vanadium acts in steel It is similar to molybdenum, the carbide of tiny MC, M2C type is formed, dispersion-strengtherning phase is generated, not only can overcome the disadvantages that the reduction of chromium content, And Austenite Grain Growth can be hindered, improve carbide morphology, improves the intensity of steel.
Specific implementation mode
Embodiment：
Each steel grade chemical compositions of 1-3 are shown in Table 1 in embodiment：
1 embodiment 1-3 chemical compositions of table
Embodiment C Si Cr Mn Ni Mo V B S P
1 0.43 0.22 0.24 0.95 1.0 1.55 1.61 It is micro 0.002 0.007
2 0.48 0.24 0.26 1.42 1.12 1.82 1.72 It is micro 0.002 0.007
3 0.45 0.19 0.22 1.00 1.5 1.30 1.64 It is micro 0.002 0.008
Manufacturing superelevation thermal conductivity hot stamping die steel, steps are as follows：
Step 1), electrode billet are smelted：Dispensing is carried out according to chemical composition in embodiment and its mass percent, using bias Electric arc furnace smelting, intermediate frequency furnace alloy are blended into refining furnace, and external refining is betted as electrode billet.
Step 2), electroslag remelting：Using ternary slag system (CaF2:Al2O3:CaO=65:30:5) electroslag remelting, and carry out Argon gas is protected, and process hydrogenation, oxygenation and nitrogen pick-up are reduced.Obtain the ESR ingot of high quality.
Step 3), ESR ingot stress relief annealing：ESR ingot carries out stress relief annealing in gas furnace, according to diameter 780 ~850 DEG C according to every 100mm heat preservation 1.5h calculate soaking time, heat preservation terminate close flue valve furnace cooling 10h, then with ≤ 30 DEG C/h be furnace-cooled to come out of the stove not higher than 150 DEG C it is air-cooled.
Step 4), heating, forging：ESR ingot is put into the heating furnace that furnace temperature is 400~450 DEG C, is added with≤60 DEG C/h Heat is then heated to 1200~1250 DEG C of 10~15h of heat preservation to 850 ± 20 DEG C of 5~8h of heat preservation with≤150 DEG C/h, and heat preservation terminates It is forged using right-angled intersection mode, final forging temperature is not less than 800 DEG C.
Step 5), forging post-processing：Sink is hoisted to after forging immediately and carries out gap water cooling, is cooled to 500~550 DEG C of surface temperature (water cooling terminate stagnate 10 minutes surfaces no longer heat up) is then kept the temperature after 10~15h in 830~860 DEG C of stoves with≤30 DEG C of stoves It is cold to be cooled to 500 DEG C of heaps of coming out of the stove.
Step 6), quenching and high tempering：1080~1140 DEG C of quenchings are heated to, oil cooling is to 80~120 DEG C, by 500 ~600 DEG C of high tempering three times, obtaining has excellent impact flexibility, the hot stamping die of temper resistance and high heat conductance Steel.
The mechanical property of embodiment 1-3 sees below list 2：
The mechanical property of 2 embodiment 1-3 of table

Claims (2)

1. a kind of superelevation thermal conductivity hot stamping die steel, which is characterized in that its alloying component includes mainly following element, with quality Percentage calculation：C 0.40~0.50%；Si≤0.30%；Cr≤0.30%；Mn 0.80~1.5%；Ni 0.80~1.50%；Mo 1.30~2.0%；V 1.30~2.0%；Micro B；Surplus Fe and other inevitable impurity.
2. a kind of manufacturing method of superelevation thermal conductivity hot stamping die steel, which is characterized in that comprise the steps of：
Step 1）, electrode billet smelt：According to superelevation thermal conductivity hot stamping die steel chemical composition and its mass percent：C 0.40 ~0.50%；Si≤0.30%；Cr≤0.30%；Mn 0.80~1.5%；Ni 0.80~1.50%；Mo 1.30~2.0%；V 1.30 ~2.0%；Micro B；Surplus Fe carries out dispensing, and using eccentric electric arc furnace smelting, intermediate frequency furnace alloy is blended into refining furnace, the outer essence of stove Refining, bets as electrode billet；
Step 2）, electroslag remelting：Using ternary slag system, CaF2:Al2O3:CaO=65:30:5 mass ratioes, electroslag remelting, and carry out Argon gas is protected, and is reduced process hydrogenation, oxygenation and nitrogen pick-up, is obtained the ESR ingot of high quality；
Step 3）, ESR ingot stress relief annealing：ESR ingot carries out stress relief annealing in gas furnace, according to diameter, 780~ At 850 DEG C, soaking time is calculated according to every 100mm heat preservations 1.5h, heat preservation terminates to close flue valve furnace cooling 10h, then Be furnace-cooled to≤30 DEG C/h come out of the stove not higher than 150 DEG C it is air-cooled；
Step 4）, heating, forging：ESR ingot is put into the heating furnace that furnace temperature is 400~450 DEG C, is heated to≤60 DEG C/h 850 ± 20 DEG C, 5~8h is kept the temperature, is then heated to 1200~1250 DEG C with≤150 DEG C/h, keeps the temperature 10~15h, heat preservation terminates to adopt It is forged with right-angled intersection mode, final forging temperature is not less than 800 DEG C；
Step 5）, forging post-processing：Sink is hoisted to after forging immediately and carries out gap water cooling, is cooled to 500~550 DEG C of surface temperature, water Cold junction beam stagnates 10 minutes surfaces and no longer heats up, and after then keeping the temperature 10~15h in 830~860 DEG C of stoves, is furnace-cooled to≤30 DEG C 500 DEG C of heaps of coming out of the stove are cold；
Step 6）, quenching and high tempering：1080~1140 DEG C of quenchings are heated to, oil cooling is to 80~120 DEG C, by 500~600 DEG C high tempering three times, obtain have excellent impact flexibility, the hot stamping die steel of temper resistance and high heat conductance.
CN201810643659.7A 2018-06-21 2018-06-21 Superelevation thermal conductivity hot stamping die steel and its manufacturing method Pending CN108774712A (en)

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CN109593921A (en) * 2018-12-27 2019-04-09 宁波兴波机械有限公司 The tufftride heat treatment method of mould steel
CN110055464A (en) * 2019-04-29 2019-07-26 上海工程技术大学 Tough hot stamping die steel of a kind of fine grain height and preparation method thereof
CN110512138A (en) * 2019-06-02 2019-11-29 青岛东盛高科模塑技术有限公司 A kind of hot stamping die alloy material and preparation method thereof
CN113403539A (en) * 2021-06-17 2021-09-17 青岛洲际钢铁有限公司 Hot stamping die steel material and manufacturing method thereof
CN114395738A (en) * 2022-01-18 2022-04-26 河北工业职业技术学院 Die steel with high thermal diffusivity and preparation method thereof

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EP1319731A1 (en) * 2001-12-14 2003-06-18 V &amp; M Deutschland GmbH Fireproof steel for a steel construction and process for manufacturing warm rolled hollow profiles, supports, a shape steel or a plate made thereof
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CN109593921A (en) * 2018-12-27 2019-04-09 宁波兴波机械有限公司 The tufftride heat treatment method of mould steel
CN110055464A (en) * 2019-04-29 2019-07-26 上海工程技术大学 Tough hot stamping die steel of a kind of fine grain height and preparation method thereof
CN110055464B (en) * 2019-04-29 2020-07-17 上海工程技术大学 Fine-grain high-toughness hot stamping die steel and preparation method thereof
CN110512138A (en) * 2019-06-02 2019-11-29 青岛东盛高科模塑技术有限公司 A kind of hot stamping die alloy material and preparation method thereof
CN113403539A (en) * 2021-06-17 2021-09-17 青岛洲际钢铁有限公司 Hot stamping die steel material and manufacturing method thereof
CN114395738A (en) * 2022-01-18 2022-04-26 河北工业职业技术学院 Die steel with high thermal diffusivity and preparation method thereof

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Application publication date: 20181109