CN108588557A - A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof - Google Patents
A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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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
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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
- C21D8/0221—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
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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
- C21D8/0247—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
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Micro-alloyed hot-rolled strips of a kind of low-carbon V N Nb and preparation method thereof, belong to hot-strip manufacturing field, chemical composition is by weight percentage：C：0.06~0.15%, Mn：1.5~2.2%, Si：0.10~0.50%, S：＜ 0.005%, P：＜ 0.015%, Al：0.01~0.05%, V：0.06~0.15%, N：0.008~0.020%, Nb：0.03~0.06%, Ti：0.01~0.02%, Cr：0.20~0.50%, surplus is Fe and other inevitable impurity.Method：1) steel billet is obtained by casting, forging after composition proportion melting；2) heating and thermal insulation；3) steel billet carries out multi-pass roughing and finish rolling obtains hot rolled plate；4) hot rolled plate elder generation water cooling, after cool to room temperature with the furnace；The present invention uses low-carbon composition design, and using V N Nb microalloyings as core, the deformation induced VN precipitates in austenite in finishing stands, manufacturing cost is low and structure property is stablized, industrialized production easy to implement.
Description
Technical field
The invention belongs to hot-strip manufacturing fields, and in particular to a kind of micro-alloyed hot-rolled strip of low-carbon V-N-Nb and its
Preparation method.
Background technology
As engineering machinery, heavy-load automobile industry are towards high standard, enlargement and the continuous development in lightweight direction, to steel
The composite request of plate is continuously improved, and not only requires superhigh intensity to realize overall structure loss of weight and ensures safety, and needs low
Cost, excellent processability and good solderability.Hot-strip is simple with production process, applied widely because of it
The features such as, very big in structural steel market demand, the demand of wherein 690MPa level low alloys high-strength steel increasingly increases, mainly
As welding structural elements such as hydraulic support, mining heavy industry vehicle frame, heavy-duty car compartment, crossbeam and wheels, it is desirable that high intensity, good
Extension property and excellent low-temperature impact toughness, while needing to have good welding performance.
Hot-strip rolls warm end to end in rear coiling process because the wide and thin feature of its steel plate, cooling are difficult to ensure uniformity
Degree fluctuation is larger, therefore can lead to structure property difference.Anshan iron and steel plant, Baosteel, Ma Gangdeng iron companies have successfully developed at present
690MPa level n b-Ti composite micro-alloyed hots roll strip, but there are still production difficult points.It is mainly shown as：(1) Nb-Ti is used
Microalloying designs, and the intensity of steel plate is mainly promoted by bainite structure reinforcing, it is therefore desirable to reduce final cooling temperature, cause
Follow-up coiling temperature is relatively low, therefore coiling machine is required to have higher equipment, and the internal stress of final coil of strip is larger.(2) it analyses
Go out to strengthen the main schedule of reinforcement for Nb-Ti micro alloyed steels, but TiC precipitates are extremely sensitive to temperature change, in curly course
Head and tail temperature difference conference causes precipitate quantity and distributional difference apparent, and performance inconsistency is big end to end for strip.(3) for proof strength
And low-temperature impact toughness, the alloying elements such as a large amount of Ni, Mo need to be often added, realize solution strengthening and the effect of refined crystalline strengthening, but
Welding carbon equivalent and cool attenuation index are increased, deteriorates welding heat affected zone impact flexibility, to prevent group of hardening
It knits and cold crack, before weldering and postwelding needs to be heat-treated, and welding procedure is complicated.Therefore urgent need, which develops one kind, can meet 690MPa
The requirement of rank hot-strip comprehensive mechanical property, but also with low cost, simple production process, low energy consumption, meets national green
The micro-alloyed hot-rolled strip of production theory.
Invention content
In view of the deficiencies of the prior art, a kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb of present invention offer and its preparation side
Method solves excessive and raw using expensive alloy element in the micro-alloyed hot-rolled strip technologies of preparing of existing 690MPa grades of Nb-Ti
Situations such as production. art is unstable.
A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb, chemical composition are by weight percentage：C：0.06~
0.15%, Mn：1.5~2.2%, Si：0.10~0.50%, S：＜ 0.005%, P：＜ 0.015%, Al：0.01~0.05%,
V：0.06~0.15%, N：0.008~0.020%, Nb：0.03~0.06%, Ti：0.01~0.02%, Cr：0.20~
0.50%, surplus is Fe and other inevitable impurity.
The hot-strip is organized as polygonal ferrite, acicular ferrite and granular bainite；The hot-strip
Thickness be 2.5~18.0mm, yield strength be 710~755MPa, tensile strength be 805~850MPa, elongation percentage be 19~
24%, -60 DEG C of ballistic works are 60~205J.
A kind of preparation method of the micro-alloyed hot-rolled strips of low-carbon V-N-Nb, specifically includes following steps：
Step 1, it casts：
According to the composition proportion of hot-strip, smelted at 1500~1550 DEG C, the molten steel of acquisition obtains steel through casting, forging
Base；
Step 2, it heats：
By heating steel billet to 1100~1200 DEG C and keep the temperature 2~4h；
Step 3, it rolls：
(1) heat after steel billet carry out multi-pass roughing, start rolling temperature be 1080~1180 DEG C, finishing temperature be 1005~
1110 DEG C, total reduction is 44~68%, obtains intermediate base；
(2) intermediate base carries out multi-pass finish rolling, and start rolling temperature is 880~950 DEG C, and finishing temperature is 805~890 DEG C, always
Reduction ratio is 58~75%, obtains hot rolled plate；
Step 4, cooling：
(1) after hot rolling, for hot rolled plate with the cooling rate water cooling of 20~45 DEG C/s, final cooling temperature is 480~540 DEG C；
(2) hot rolled plate after water cooling is put into heating furnace identical with final cooling temperature immediately and cools to room temperature with the furnace, obtained
To the micro-alloyed hot-rolled strips of low-carbon V-N-Nb.
A kind of preparation method of above-mentioned micro-alloyed hot-rolled strips of low-carbon V-N-Nb, wherein：
In the step 1, the thickness of steel billet is 50~130mm.
In the step 3, by 2~4 passage roughing, single pass be averaged reduction ratio be 23~26%.
In the step 3, by 5~7 passage finish rolling, single pass be averaged reduction ratio be 18~25%.
In the step 3, the thickness of hot rolled plate is 2.5~18.0mm.
In the step 4, heating furnace is high temperature box type resistance furnace.
In the step 4, the purpose of furnace cooling is the coiling process simulated in hot-strip industrialized production.
Above-mentioned a kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof, the main thought of technical solution is：
Panzhihua and Chengde area in China, navajoite resource reserve are abundant, using the design of V-N microalloys have significantly at
This advantage.
Deformation induced VN is precipitated the present invention in austenite during the rolling process, to promote acicular ferrite intragranular nucleation,
Acicular ferrite has apparent build up effect, and in addition its high density high-angle boundary greatly enhances low-temperature flexibility；Pass through into
Divide and process optimization regulates and controls yield tensile ratio so as to adjust the volume fraction and form on the islands M/A, improves extension property, batched after end is cold
The nanoscale VC precipitates being precipitated in the process can also play the role of significant precipitation strength.
The compound a small amount of Nb elements of addition of the present invention, improve austenite recrystallization final temperature, at relatively high temperatures using Nb
The rolling for realizing austenite Unhydrated cement, can mitigate mill load, simultaneously because Nb carbonitrides are precipitated in ferrite area, make
Ferrite matrix is obtained also to be strengthened；The compound additions of V and Nb can improve band hardness of steel but also improve its toughness；It adds micro
Cheap Cr elements can inhibit coarse pro-eutectoid ferrite and generate, and promote bainite transformation, while promoting intensity；Low-carbon at
Under point, trace Ti element is added, inhibits weld coarse crystal region abnormal grain growth, obdurability is improved by crystal grain refinement, it is ensured that good
Good welding performance.
A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof of the present invention, compared with prior art, have
Beneficial effect is：
It is 0.06~0.15% that the present invention, which uses low-carbon composition design, C weight percentages, and low carbon content reduces carbon and works as
Amount and cooling cracks the susceptible index number, ensure that the welding performance of steel plate.Using V-N-Nb microalloyings as core, controlled not again by Nb
Crystal region rolls, Nb Carbonitride Precipitation phase reinforced ferrite matrixes；Deformation induced VN is precipitated in austenite in finishing stands
Object remarkably promotes intragranular acicular ferrite forming core, refined crystalline strengthening, build up significant effect；Nanometer during furnace cooling
The VC precipitates of scale can play extremely strong precipitation strength effect；Addition Cr elements can inhibit coarse pro-eutectoid ferrite life
At, promote bainite transformation, promoted intensity, therefore controlled rolling and controlled cooling V-N-Nb micro alloyed steels have structure property high uniformity,
The advantages that obdurability matching is good；Rationally control alloying element dosage, preparation process are easy, production cost less than same level other
Product, and industrialized production easy to implement.
Description of the drawings
The process schematic representation of Fig. 1 preparation methods of the present invention；
The metallographic structure of hot-strip made from Fig. 2 embodiment of the present invention 1；
The scanning electron microscope pattern of hot-strip made from Fig. 3 embodiment of the present invention 2；
The metallographic structure of hot-strip made from Fig. 4 embodiment of the present invention 3.
Specific implementation mode
Following non-limiting embodiments can make those skilled in the art be more fully understood the present invention, but not with
Any mode limits the present invention.
Test method described in following embodiments is unless otherwise specified conventional method；The reagent and material, such as
Without specified otherwise, commercially obtain.
The hot-rolling mill that following embodiments use automates National Key Laboratory for Northeastern University's rolling technique and tandem rolling
Φ 450mm hot-rolling mills, model RX4-85-13B；Scanning electron microscope used is 600 tungsten filaments of FEI Quanta scanning electricity
Sub- microscope；Light microscope used is OLYMPUS BX53M multifunctional optical microscopes.
The process schematic representation of the preparation method of following Examples 1 to 3, as shown in Figure 1.
Embodiment 1
The micro-alloyed hot-rolled strips of low-carbon V-N-Nb that a kind of thickness is 18.0mm, chemical composition is by weight percentage
For：C：0.06%, Mn：2.2%, Si：0.50%, S：0.003%, P：0.015%, Al：0.0l%, V：0.15%, N：
0.020%, Nb：0.06%, Ti：0.02%, Cr：0.50%, surplus is Fe and other inevitable impurity；
A kind of thickness is the preparation method of the micro-alloyed hot-rolled strips of 18.0mm low-carbons V-N-Nb, specifically includes following step
Suddenly：
Step 1, it casts：
According to the composition proportion of hot-strip, smelted at 1550 DEG C, the molten steel of acquisition is through casting, forging to obtain thickness
130mm steel billets；
Step 2, it heats：
Heating steel billet to 1200 DEG C and is kept the temperature into 4h；
Step 3, it rolls：
(1) steel billet after heating carries out 2 passage roughing, and start rolling temperature is 1180 DEG C, and finishing temperature is 1110 DEG C, single pass
Average reduction ratio is 25%, and total reduction 44% obtains intermediate base；
(2) intermediate base carries out 5 passage finish rolling, and start rolling temperature is 950 DEG C, and finishing temperature is 890 DEG C, under single pass mean pressure
Rate is 25%, total reduction 75%, obtains the hot rolled plate that thickness is 18.0mm；
Step 4, cooling：
(1) after hot rolling, for hot rolled plate with the cooling rate water cooling of 20 DEG C/s, final cooling temperature is 540 DEG C；
(2) it is the coiling process simulated in hot-strip industrialized production, is immediately put into the hot rolled plate after water cooling and end
Room temperature is cooled to the furnace in the identical heating furnace of cold temperature, obtains the micro-alloyed hot-rolled strips of low-carbon V-N-Nb.
Hot-strip manufactured in the present embodiment is organized as polygonal ferrite, acicular ferrite and granular bainite,
Metallographic structure is as shown in Figure 2；After testing, which is 710MPa, tensile strength 805MPa, and elongation percentage is
24%, 10mm thickness sample ballistic works 205J at -60 DEG C.
Embodiment 2
A kind of thickness is the micro-alloyed hot-rolled strips of 10.0mm low-carbons V-N-Nb, and chemical composition is by weight percentage：：
C：0.11%, Mn：1.9%, Si：0.29%, S：0.002%, P：0.009%, Al：0.05%, V：0.10%, N：0.012%,
Nb：0.04%, Ti：0.015%, Cr：0.36%, surplus is Fe and other inevitable impurity；
A kind of preparation method for the micro-alloyed hot-rolled strips of low-carbon V-N-Nb that thickness is 10.0mm, specifically includes following step
Suddenly：
Step 1, it casts：
According to the composition proportion of hot-strip, smelted at 1550 DEG C, the molten steel of acquisition is through casting, forging to obtain thickness
80mm steel billets；
Step 2, it heats：
Heating steel billet to 1150 DEG C and is kept the temperature into 3h；
Step 3, it rolls：
(1) steel billet after heating carries out 3 passage roughing, and start rolling temperature is 1130 DEG C, and finishing temperature is 1060 DEG C, single pass
Average reduction ratio is 25%, and total reduction 60% obtains intermediate base；
(2) intermediate base carries out 6 passage finish rolling, and start rolling temperature is 910 DEG C, and finishing temperature is 835 DEG C, under single pass mean pressure
Rate is 19%, total reduction 69%, obtains the hot rolled plate that thickness is 10.0mm；
Step 4, cooling：
(1) after hot rolling, for hot rolled plate with the cooling rate water cooling of 37 DEG C/s, final cooling temperature is 505 DEG C；
(2) it is the coiling process simulated in hot-strip industrialized production, is immediately put into the hot rolled plate after water cooling and end
Room temperature is cooled to the furnace in the identical heating furnace of cold temperature, obtains the micro-alloyed hot-rolled strips of low-carbon V-N-Nb.
Hot-strip manufactured in the present embodiment is organized as polygonal ferrite, acicular ferrite and granular bainite,
It is as shown in Figure 3 to scan pattern；After testing, which is 732MPa, tensile strength 836MPa, and elongation percentage is
21%, 5mm thickness sample ballistic works 110J at -60 DEG C.
Embodiment 3
A kind of thickness is the micro-alloyed hot-rolled strips of 2.5mm low-carbons V-N-Nb, and chemical composition is by weight percentage：C：
0.15%, Mn：1.5%, Si：0.10%, S：0.003%, P：0.012%, Al：0.01%, V：0.06%, N：0.008%,
Nb：0.03%, Ti：0.01%, Cr：0.20%, surplus is Fe and other inevitable impurity；
A kind of thickness is the preparation method of the micro-alloyed hot-rolled strips of 2.5mm low-carbons V-N-Nb, specifically includes following steps：
Step 1, it casts：
According to the composition proportion of hot-strip, smelted at 1550 DEG C, the molten steel of acquisition is through casting, forging to obtain thickness
The steel billet of 50mm；
Step 2, it heats：
Heating steel billet to 1100 DEG C and is kept the temperature into 2h；
Step 3, it rolls：
(1) steel billet after heating carries out 4 passage roughing, and start rolling temperature is 1080 DEG C, and finishing temperature is 1005 DEG C, single pass
Average reduction ratio is 25%, and total reduction 68% obtains intermediate base；
(2) intermediate base carries out 7 passage finish rolling, and start rolling temperature is 880 DEG C, and finishing temperature is 805 DEG C, under single pass mean pressure
Rate is 22%, total reduction 58%, obtains the hot rolled plate that thickness is 2.5mm；
Step 4, cooling：
(1) after hot rolling, for hot rolled plate with the cooling rate water cooling of 45 DEG C/s, final cooling temperature is 480 DEG C；
(2) it is the coiling process simulated in hot-strip industrialized production, is immediately put into the hot rolled plate after water cooling and end
Room temperature is cooled to the furnace in the identical heating furnace of cold temperature, obtains the micro-alloyed hot-rolled strips of low-carbon V-N-Nb.
Hot-strip manufactured in the present embodiment is organized as polygonal ferrite, acicular ferrite and granular bainite,
Metallographic structure is as shown in Figure 4；After testing, which is 755MPa, tensile strength 850MPa, and elongation percentage is
19%, 2.5mm thickness sample ballistic works 60J at -60 DEG C.
Claims (7)
1. a kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb, which is characterized in that the hot-strip chemical composition by weight hundred
Point ratio is：C：0.06~0.15%, Mn：1.5~2.2%, Si：0.10~0.50%, S：＜ 0.005%, P：＜ 0.015%,
Al：0.01~0.05%, V：0.06~0.15%, N：0.008~0.020%, Nb：0.03~0.06%, Ti：0.01~
0.02%, Cr：0.20~0.50%, surplus is Fe and other inevitable impurity.
2. a kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb according to claim 1, which is characterized in that the hot-rolled strip
Steel is organized as polygonal ferrite, acicular ferrite and granular bainite；The thickness of the hot-strip be 2.5~
18.0mm, yield strength are 710~755MPa, and tensile strength is 805~850MPa, and elongation percentage is 19~24%, -60 DEG C of impacts
Work(is 60~205J.
3. a kind of preparation method of micro-alloyed hot-rolled strips of low-carbon V-N-Nb described in claim 1, which is characterized in that specific
Include the following steps：
Step 1, it casts：
According to the composition proportion of hot-strip, smelted at 1500~1550 DEG C, the molten steel of acquisition obtains steel billet through casting, forging；
Step 2, it heats：
By heating steel billet to 1100~1200 DEG C and keep the temperature 2~4h；
Step 3, it rolls：
(1) steel billet after heating carries out multi-pass roughing, and start rolling temperature is 1080~1180 DEG C, and finishing temperature is 1005~1110
DEG C, total reduction is 44~68%, obtains intermediate base；
(2) intermediate base carries out multi-pass finish rolling, and start rolling temperature is 880~950 DEG C, and finishing temperature is 805~890 DEG C, under stagnation pressure
Rate is 58~75%, obtains hot rolled plate；
Step 4, cooling：
(1) after hot rolling, for hot rolled plate with the cooling rate water cooling of 20~45 DEG C/s, final cooling temperature is 480~540 DEG C；
(2) hot rolled plate after water cooling is put into heating furnace identical with final cooling temperature immediately and cools to room temperature with the furnace, obtained low
The micro-alloyed hot-rolled strips of carbon V-N-Nb.
4. a kind of preparation method of micro-alloyed hot-rolled strips of low-carbon V-N-Nb according to claim 3, which is characterized in that
In the step 1, the thickness of steel billet is 50~130mm.
5. a kind of preparation method of micro-alloyed hot-rolled strips of low-carbon V-N-Nb according to claim 3, which is characterized in that
In the step 3, by 2~4 passage roughing, single pass be averaged reduction ratio be 23~26%.
6. a kind of preparation method of micro-alloyed hot-rolled strips of low-carbon V-N-Nb according to claim 3, which is characterized in that
In the step 3, by 5~7 passage finish rolling, single pass be averaged reduction ratio be 18~25%.
7. a kind of preparation method of micro-alloyed hot-rolled strips of low-carbon V-N-Nb according to claim 3, which is characterized in that
In the step 3, the thickness of hot rolled plate is 2.5~18.0mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205565A (en) * | 2019-06-01 | 2019-09-06 | 东莞市东莞理工科技创新研究院 | A kind of 690 steel of disperse nano reinforcement and its manufacturing method |
| CN110565019A (en) * | 2019-09-29 | 2019-12-13 | 山东钢铁股份有限公司 | high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof |
| CN111041345A (en) * | 2019-11-08 | 2020-04-21 | 河钢股份有限公司承德分公司 | 800 MPa-grade vanadium-containing low-carbon bainite complex phase steel and production method thereof |
| CN115807188A (en) * | 2022-11-23 | 2023-03-17 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
| CN116043108A (en) * | 2022-12-13 | 2023-05-02 | 东北大学 | Low-yield-ratio V-N microalloyed 690 MPa-level medium plate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205565A (en) * | 2019-06-01 | 2019-09-06 | 东莞市东莞理工科技创新研究院 | A kind of 690 steel of disperse nano reinforcement and its manufacturing method |
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| CN111041345A (en) * | 2019-11-08 | 2020-04-21 | 河钢股份有限公司承德分公司 | 800 MPa-grade vanadium-containing low-carbon bainite complex phase steel and production method thereof |
| CN115807188A (en) * | 2022-11-23 | 2023-03-17 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
| CN115807188B (en) * | 2022-11-23 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Low-carbon steel and preparation method thereof |
| CN116043108A (en) * | 2022-12-13 | 2023-05-02 | 东北大学 | Low-yield-ratio V-N microalloyed 690 MPa-level medium plate and preparation method thereof |
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| CN108588557B (en) | 2019-12-03 |
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