CN110093559A - Steel splitting plate and preparation method are matched in quenching-tempering based on carbon manganese collaboration partition - Google Patents

Steel splitting plate and preparation method are matched in quenching-tempering based on carbon manganese collaboration partition Download PDF

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CN110093559A
CN110093559A CN201910340812.3A CN201910340812A CN110093559A CN 110093559 A CN110093559 A CN 110093559A CN 201910340812 A CN201910340812 A CN 201910340812A CN 110093559 A CN110093559 A CN 110093559A
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partition
steel
quenching
manganese
temperature
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谭小东
何焕生
严俊
饶席
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Southwest University
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention is quenching-tempering based on carbon manganese collaboration partition with steel splitting plate and preparation method, belongs to hot-rolled steel plates for automobiles exploitation manufacturing field.Ingredient is C, Si, Mn, Al, P, S, Fe and inevitable impurity；Steel plate thickness is 2-5mm.Preparation method: 1) alloy melting, casting and forging；2) two stages hot rolling；3) prequenching is handled；4) one-step or two-step intercritical annealing manganese partition is handled；5) temper carbon partition is handled.The yield strength of gained steel plate of the invention is 420-495MPa, tensile strength 705-805MPa, work hardening index 0.17-0.19, elongation after fracture is 18.8%-23.4%, strength and ductility product is greater than 15000MPa%, and cost of alloy and process sensitivity are low, and microstructure and stable mechanical property are high.Preparation method production cost of the invention and technology difficulty are low, and practicability and feasibility are high.

Description

Steel splitting plate and preparation method are matched in quenching-tempering based on carbon manganese collaboration partition
Technical field
The invention belongs to hot-rolled steel plates for automobiles to develop manufacturing field, the in particular to quenching-based on carbon manganese collaboration partition Steel splitting plate and preparation method are matched in tempering.
Background technique
Automobile high-strength steel is the important materials of automobile structure manufacture.In the double requirements of body lightening and safety Under, how to further increase strong plasticity is the critical issue that vehicle structure structure of steel performance optimization and upgrading is faced.It is remaining difficult to understand Family name's body is because unique phase-change induced plastic (TRIP) effect can significantly improve adding for steel material itself in deformation process for it Work hardening rate, and then greatly improve strong plasticity.Therefore, on the basis of sufficiently refinement body-centered cubic (BCC) structural matrix tissue On, it introduces the moderate metastable retained austenite of appropriate stability and has become the important enhancing plasticising means of vehicle structure steel.When Before, the Typical automotive structural steel with TRIP effect mainly has TRIP steel, quenching partition (Q&P) steel and medium managese steel.
Promoting stabilization of austenite is regulation residual austenite content and stability and optimization TRIP effect validity It is crucial.Traditional TRIP steel and Q&P steel rely primarily on Bainite Region or martensitic regions (200-550oC) the carbon during isothermal hardening Partition realizes that carbon from BCC structural matrix to the enrichment for not changing austenite, and then realizes the stabilisation of retained austenite.With regard to shellfish For the area Shi Ti or martensitic regions isothermal quenching technique, hardening heat has decisive influence to structure property.However it is practical raw The hardening heat for producing discovery room temperature or more easily fluctuates, and thus causes tradition TRIP steel and Q&P structure of steel performance is unstable, That is the big problem of process sensitivity, this constrains the practical application of traditional TRIP steel and Q&P steel significantly.Medium managese steel is (especially warm Roll medium managese steel) (a few hours to the tens of hours) annealing for a long time of high temperature critical zone is relied primarily on, using manganese from ferrite to Ovshinsky The partition of body realizes the stabilisation of retained austenite.Prolonged high annealing causes energy consumption huge.Higher manganese content is big Cost of alloy and rolling difficulty are improved greatly, also result in and manganese segregation easily occurs in casting process and then leads to structure property not Stablize.Therefore, traditional medium managese steel also exists biggish using difficulty.
The research of comprehensive routine TRIP steel, Q&P steel and medium managese steel is as it can be seen that the stabilized approach of retained austenite mainly has height Warm critical zone manganese partition and cryogenic carbon partition.If 4.0wt% can be down to manganese content on the basis of conventional medium managese steel hereinafter, closing Reason adjustment alloying component and heat treatment process, combine critical zone manganese partition with cryogenic carbon partition, realize the efficient of austenite It stabilizes and substantially shortens the high temperature intercritical annealing time, will effectively solve the difficult bottleneck problem of current medium managese steel application.Meanwhile If can on the basis of conventional Q&P technique reasonably optimizing alloying component and heat treatment process, adjust the ferritic content in critical zone, By the M of critical zone austenitesAnd MfPoint is controlled respectively more than room temperature and room temperature hereinafter, realize that hardening heat is room temperature in turn Q&P heat treatment, by effective technical bottleneck for solving Q&P steel process sensitivity height and stability difference.
Summary of the invention
In view of the above technical problems, the present invention provides quenching-tempering based on carbon manganese collaboration partition to match steel splitting plate and system Preparation Method.
Steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of the invention, and ingredient is by mass percentage are as follows: C: 0.15-0.30%, Si:0.5-1.6%, Mn:1.5-4.0%, Al:0.5-2.5%, P:0.001-0.1%, S :≤0.004%, surplus is Fe and inevitable impurity；Steel plate thickness is 2-5mm.
Steel splitting plate, yield strength 420-495MPa, tension are matched in quenching-tempering based on carbon manganese collaboration partition of the invention Intensity is 705-805MPa, work hardening index 0.17-0.19, elongation after fracture 18.8%-23.4%, and strength and ductility product is greater than 15000MPa%。
Steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of the invention, and room temperature texture is lath-shaped ferrite base Body and island retained austenite and a small amount of martensite.
The preparation method of steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of the invention, is included the following steps:
(1) alloy melting, casting and forging:
Raw material is provided with the component ratio of steel splitting plate by quenching-tempering based on carbon manganese collaboration partition, utilizes vacuum induction furnace Melting simultaneously casts ingot, and the forging stock with a thickness of 50-100mm is then made through flat-die forging；
(2) two stages hot rolling:
A) by the forging stock obtained by step (1) with a thickness of 50-100mm 1100oC-1300oC keeps the temperature 2-3h, to realize the equal of element It homogenizes；
B) first stage hot rolling: in 1050-1150oC open rolling is rolled to 15-25mm thickness through 2-4 passage, and finishing temperature control exists 900-950oC, pass deformation control are controlled in 30%-40%, cumulative deformation in 60%-80%；
C) second stage hot rolling: in 900-950oC open rolling is rolled to 2-5mm thickness through 3-7 passage, and finishing temperature control is in 600- 800oC, pass deformation control are controlled in 20%-35%, cumulative deformation in 60%-90%；
D) water quenching, air-cooled or 600-800 are usedoSlab is cooled to room temperature by the mode of C furnace cooling, is obtained with a thickness of 2-5mm Hot rolled plate；
(3) prequenching is handled:
By step 2 gained hot rolled plate with 2-15oThe heating rate of C/s is heated to 900-1250oC keeps the temperature 25-35min, then water It quenches to room temperature, obtains the hot rolled plate with lath martensite matrix, the width of the lath is 100-500nm；
(4) two step intercritical annealings are handled or used using a step intercritical annealing manganese partition to the hot rolled plate that step (3) obtains The processing of manganese partition:
The one step intercritical annealing manganese partition processing, includes the following steps: hot rolled plate obtained by step (3) with 2-15oC/s Heating rate be heated to 700-800oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature；
The two step intercritical annealing manganese partitions processing, includes the following steps: hot rolled plate obtained by step (3) with 2-15oC/s Heating rate be heated to 800-900oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature, then again with 2-15oThe heating rate of C/s is heated to 700-800oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature;
(5) temper carbon partition is handled:
By hot rolled plate obtained by step (4) in 200-400oC keeps the temperature 1-30min, then with 10-30oThe cooling rate of C/s is cooled to Room temperature obtains cooperateing with quenching-tempering of partition with steel splitting plate based on carbon manganese.
Further, in the step 1, smelting temperature 1600-1650oC。
Technical thought of the invention is as follows:
Manganese content is reduced to 4.0wt% or less to save cost of alloy on the component base of traditional medium managese steel；High temperature is critical Area's annealing manganese partition combines the efficient stable of realization retained austenite with cryogenic carbon partition, while by single step intercritical annealing Time foreshortens to 30min or less to reduce energy consumption of annealing；By reasonably adjusting alloying component and heat treatment process, optimize critical zone The ratio and its carbon manganese of ferrite and austenite cooperate with partition behavior in annealing process, by the M of critical zone austenitesAnd MfPoint minute Not Kong Zhi more than room temperature and room temperature hereinafter, realize hardening heat be room temperature Q&P be heat-treated, and then reduce experiment steel technique Sensibility.Finally, carrying out martempering and the processing of carbon partition at a certain temperature for being higher than room temperature, residual austenite content is realized And the optimal control of stability.
Quenching-tempering partition Design of Heat Treatment Process principle based on carbon manganese collaboration partition is as follows: first testing hot rolling Steel is heated to 900-1200oC keeps the temperature 25-35min to realize full austenite, and subsequent water quenching to room temperature obtains uniformly tiny plate Martensitic structure.By in critical zone (700-900oC the intercritical annealing of one-step or two-step (30mim or less) in short-term) is carried out Processing realizes that the carbon manganese in austenite cooperates with partition, by the M of austenitesPoint and MfPoint control more than room temperature respectively and room temperature with Under, then do not change austenite for what steel plate quenching to room temperature obtained certain content.Finally, in 200-400oC keeps the temperature 1- 30min is realized and is promoted the carbon of martensite to the diffusion enrichment for not changing austenite, Jin Eryou while the temper softening of martensite Change the content and stability of retained austenite.
Steel splitting plate and preparation method are matched in quenching-tempering based on carbon manganese collaboration partition of the invention, compared with prior art, It has the beneficial effect that
(1) with steel splitting plate compared with traditional low-carbon and low-alloy Q&P steel, hardening heat is room temperature, carbon for quenching-tempering of the invention Partition is synchronous with martenaging martempering to be realized, process sensitivity is greatly reduced, and performance stabilization greatly improves；
(2) with steel splitting plate compared with traditional medium managese steel, cost of alloy is greatly reduced, while critical for quenching-tempering of the invention Area's annealing time substantially shortens, therefore energy consumption of annealing also is greatly reduced；
(3) for retained austenite stabilizes, traditional low-carbon and low-alloy Q&P steel mainly relies on merely cryogenic carbon partition, tradition Medium managese steel relies primarily on long-time intercritical annealing manganese partition, and quenching-tempering of the invention matches steel splitting plate then by critical zone manganese Partition is combined with cryogenic carbon partition, realizes the efficient stable of retained austenite, shortens annealing time, simplifies heat treatment dress It is standby.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out Illustrate:
Fig. 1 is that the preparation side of steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of Example 1 and Example 2 of the present invention Rolling and heat treatment process schematic diagram in method, wherein (a) corresponding embodiment 1, (b) corresponding embodiment 2.
Fig. 2 is that the secondary electron image of steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of the embodiment of the present invention 1, Wherein, (a) is 2000 times corresponding, (b) 6000 times corresponding.
Fig. 3 is that the XRD testing result of steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition of the embodiment of the present invention 1.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
Embodiment 1
Steel splitting plate is matched in the quenching-tempering based on carbon manganese collaboration partition of the present embodiment, and chemical component is by mass percentage are as follows: C: 0.18%, Si:0.53%, Mn:1.95%, Al:1.46%, P:0.08%, S :≤0.004%, surplus be Fe and inevitably it is miscellaneous Matter；Steel plate thickness is 4mm.
Steel plate rolling and heat treatment process schematic diagram such as Fig. 1 (a) are shown, the preparation method of the present embodiment, including following step It is rapid:
Step 1, alloy melting, casting and forging:
Raw material is provided in above-mentioned chemical component ratio, 1620oC carries out melting, ingot is then cast, through being freely forged into cross Sectional dimension is the forging stock of 60 × 60mm.
Step 2, two stages hot rolling:
(1) by forging stock, in 1200 oCKeep the temperature 2h；
(2) first stage hot rolling: in 1150oC open rolling is rolled to the thick control of rolling temperature simultaneously of 15mm 900 through 3 passagesoC with On, single pass heavy deformation 35%-39%, cumulative deformation 62%；
(3) second stage hot rolling: it is rolled to 4mm thickness through 4 passages, finishing temperature control is 800oC or so, single pass heavy deformation are 20%-34%, cumulative deformation 60%；
(4) it is air-cooled to room temperature, obtains the steel plate with a thickness of 4mm.
Step 3, prequenching is handled:
In 1200oC keeps the temperature 30min, water quenching to room temperature.
Step 4, it is handled using a step intercritical annealing manganese partition:
Steel plate is heated to 750oC keeps the temperature 30min, water quenching to room temperature.
Step 5, temper carbon partition is handled:
Steel plate is heated to 300oC keeps the temperature 15min, water quenching to room temperature.
Steel splitting plate, yield strength 482MPa, tension are matched in the resulting quenching-tempering based on carbon manganese collaboration partition of this example Intensity is 788MPa, work hardening index 0.18, elongation after fracture 20.1%, strength and ductility product 15678MPa%.Test steel Secondary electron image is as shown in Figure 2, it is seen that experiment steel is mainly by lath-shaped ferrite matrix and island retained austenite and a small amount of horse Family name's body is constituted.The XRD material phase analysis result for testing steel is as shown in Figure 3, it is seen that with the presence of retained austenite in experiment steel.
Embodiment 2
Steel splitting plate is matched in the quenching-tempering based on carbon manganese collaboration partition of the present embodiment, and chemical component is by mass percentage are as follows: C: 0.18%, Si:0.53%, Mn:1.95%, Al:1.46%, P:0.08%, S :≤0.004%, surplus be Fe and inevitably it is miscellaneous Matter；Steel plate thickness is 4mm.
Steel plate rolling and heat treatment process schematic diagram such as Fig. 1 (b) are shown, the preparation method of the present embodiment, including following step It is rapid:
Step 1, alloy melting, casting and forging:
Raw material is provided in above-mentioned chemical component ratio, 1650oC carries out melting, ingot is then cast, through being freely forged into cross Sectional dimension is the forging stock of 80 × 60mm.
Step 2, two stages hot rolling:
(1) by forging stock, in 1200oC keeps the temperature 2h；
(2) first stage hot rolling: in 1100oC open rolling is rolled to the thick control of rolling temperature simultaneously of 15mm 950 through 3 passagesoC with On, single pass heavy deformation 36%-38%, cumulative deformation 63%；
(3) second stage hot rolling: it is rolled to 4mm thickness through 4 passages, finishing temperature control is 760oC or so, single pass heavy deformation are 19%-33%, cumulative deformation 58%；
(4) it is air-cooled to room temperature, obtains the steel plate with a thickness of 4mm.
Step 3, prequenching is handled:
In 1200oC keeps the temperature 30min, water quenching to room temperature.
Step 4, it is handled using two step intercritical annealing manganese partitions:
(1) steel plate is heated to 800oC keeps the temperature 30min, water quenching to room temperature；
(2) steel plate is heated to 750 againoC keeps the temperature 30min, water quenching to room temperature.
Step 5, temper carbon partition is handled:
Steel plate is heated to 300oC keeps the temperature 15min, water quenching to room temperature.
Steel splitting plate, yield strength 425MPa, tension are matched in the resulting quenching-tempering based on carbon manganese collaboration partition of this example Intensity is 722MPa, work hardening index 0.19, elongation after fracture 22.5%, strength and ductility product 16245MPa%.

Claims (5)

1. steel splitting plate is matched in quenching-tempering based on carbon manganese collaboration partition, which is characterized in that its ingredient is by mass percentage are as follows: C: 0.15-0.30%, Si:0.5-1.6%, Mn:1.5-4.0%, Al:0.5-2.5%, P:0.001-0.1%, S :≤0.004%, surplus is Fe and inevitable impurity；Steel plate thickness is 2-5mm.
2. steel splitting plate is matched in quenching-tempering according to claim 1 based on carbon manganese collaboration partition, which is characterized in that steel plate Yield strength be 420-495MPa, tensile strength 705-805MPa, work hardening index 0.17-0.19, extension of having no progeny Rate is 18.8%-23.4%, and strength and ductility product is greater than 15000MPa%.
3. steel splitting plate is matched in quenching-tempering according to claim 1 based on carbon manganese collaboration partition, which is characterized in that room temperature Tissue is lath-shaped ferrite matrix and island retained austenite and a small amount of martensite.
4. the preparation side that steel splitting plate is matched in quenching-tempering according to claim 1-3 based on carbon manganese collaboration partition Method, which comprises the steps of:
(1) alloy melting, casting and forging:
The component ratio of steel plate according to claim 1 provides raw material, using vacuum induction furnace melting and casts ingot, so The forging stock with a thickness of 50-100mm is made by flat-die forging；
(2) two stages hot rolling:
A) by the forging stock obtained by step (1) with a thickness of 50-100mm 1100oC-1300oC keeps the temperature 2-3h, to realize the equal of element It homogenizes；
B) first stage hot rolling: in 1050-1150oC open rolling is rolled to 15-25mm thickness through 2-4 passage, and finishing temperature control is in 900- 950oC, pass deformation control are controlled in 30%-40%, cumulative deformation in 60%-80%；
C) second stage hot rolling: in 900-950oC open rolling is rolled to 2-5mm thickness through 3-7 passage, and finishing temperature control is in 600- 800oC, pass deformation control are controlled in 20%-35%, cumulative deformation in 60%-90%；
D) water quenching, air-cooled or 600-800 are usedoSlab is cooled to room temperature by the mode of C furnace cooling, is obtained with a thickness of 2-5mm's Hot rolled plate;
(3) prequenching is handled:
By hot rolled plate obtained by step (2) with 2-15oThe heating rate of C/s is heated to 900-1200oC keeps the temperature 25-35min, then water It quenches to room temperature, obtains the hot rolled plate with lath martensite matrix, the width of the lath is 100-500nm;
(4) two step intercritical annealings are handled or used using a step intercritical annealing manganese partition to the hot rolled plate that step (3) obtains The processing of manganese partition:
The one step intercritical annealing manganese partition processing, includes the following steps: hot rolled plate obtained by step (3) with 2-15oC/s Heating rate be heated to 700-800oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature；
The two step intercritical annealing manganese partitions processing, includes the following steps: hot rolled plate obtained by step (3) with 2-15oC/s Heating rate be heated to 800-900oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature, then again with 2-15oThe heating rate of C/s is heated to 700-800oC keeps the temperature 25-35min, with 30-80oThe cooling rate of C/s is cooled to room temperature;
(5) temper carbon partition is handled:
By hot rolled plate obtained by step (4) in 200-400oC keeps the temperature 1-30min, then with 10-30oThe cooling rate of C/s is cooled to Room temperature obtains cooperateing with quenching-tempering of partition with steel splitting plate based on carbon manganese.
5. the preparation method of steel splitting plate, feature are matched in quenching-tempering according to claim 4 based on carbon manganese collaboration partition It is, in the step (1), smelting temperature 1600-1650oC。
CN201910340812.3A 2019-04-25 2019-04-25 Steel splitting plate and preparation method are matched in quenching-tempering based on carbon manganese collaboration partition Pending CN110093559A (en)

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CN113462957A (en) * 2021-05-27 2021-10-01 钢铁研究总院 Preparation method of martensite/austenite complex phase structure wear-resistant steel
CN113502382A (en) * 2021-06-28 2021-10-15 东北大学 Preparation method of 980MPa grade cold-rolled high-strength steel with ultrahigh ductility
CN113699458A (en) * 2021-09-08 2021-11-26 山东建筑大学 Preparation method and application of advanced high-strength steel capable of realizing room-temperature Q & P process
CN115161549A (en) * 2022-05-27 2022-10-11 郑州轻研合金科技有限公司 High-tensile-strength alloy steel plate and preparation method thereof
CN115181913A (en) * 2022-07-15 2022-10-14 燕山大学 Preparation method of low-manganese-content medium manganese steel
CN115198191A (en) * 2022-07-25 2022-10-18 内蒙古科技大学 Preparation method of medium manganese steel with low yield ratio and low yield elongation

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CN113249652A (en) * 2021-05-13 2021-08-13 广东麦格智芯精密仪器有限公司 Retained austenite-adjusted special steel for flexible gear and preparation method thereof
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CN115181913A (en) * 2022-07-15 2022-10-14 燕山大学 Preparation method of low-manganese-content medium manganese steel
CN115198191A (en) * 2022-07-25 2022-10-18 内蒙古科技大学 Preparation method of medium manganese steel with low yield ratio and low yield elongation
CN115198191B (en) * 2022-07-25 2022-12-23 内蒙古科技大学 Preparation method of medium manganese steel with low yield ratio and low yield elongation

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Application publication date: 20190806