CN108866451A - Yield strength 240MPa level structure cold-rolled steel sheet and preparation method - Google Patents
Yield strength 240MPa level structure cold-rolled steel sheet and preparation method Download PDFInfo
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- CN108866451A CN108866451A CN201810782328.1A CN201810782328A CN108866451A CN 108866451 A CN108866451 A CN 108866451A CN 201810782328 A CN201810782328 A CN 201810782328A CN 108866451 A CN108866451 A CN 108866451A
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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
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C22C38/06—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
- C21D2211/005—Ferrite
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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 Sheet Steel (AREA)
Abstract
This application discloses a kind of yield strength 240MPa level structure cold-rolled steel sheet and preparation method, which is by mass percentage：C：0.15-0.18%, Mn：0.40-0.60%, Si≤0.05%, P≤0.02%, S≤0.01%, Als：0.02-0.06%, remaining is Fe and other inevitable impurity.The advantage of the invention is that steel plate is designed using carbon manganese ingredient, the yield strength after annealing and being smooth is 240-340MPa, tensile strength 390-480MPa, elongation after fracture >=29%.
Description
Technical field
The application belongs to metallurgical technology field, in particular to a kind of yield strength 240MPa level structure cold-rolled steel sheet and system
Preparation Method.
Background technique
The development of the industries such as automobile, household electrical appliances, building, promotes the demand of all kinds of high strength cold rolled steel plates, medium carbon manganese at
The cold-rolling structure steel divided, due to moderate strength, forming property is good, and production cost is relatively low, can be widely used in manufacture vehicle body
Portion's structural member, household appliance structure part, all kinds of steel pipes etc..
The primary alloy constituent of carbon manganese structural steel composition is C, Mn element, mainly improves armor plate strength by solution strengthening.At present
Body of a motor car manufactures the carbon manganese structural steel composition used, often uses lower carbon content, is improved by adding higher Mn alloy
Intensity.240MPa grades of yield strength of the structural carbon steel trade mark includes national standard Q235, moral mark St37-2G, St44-2G, Baosteel enterprise
Mark B240ZK etc..
Chinese invention patent (application publication number CN103882292A) discloses a kind of production method of cold rolling carbon steel,
Essential element mass percent is in chemical component：C, 0.06-0.10%；Mn, 1.2-1.5%；Si ,≤0.06%, at setting up separately
C element content is lower in meter, and Mn content is high, anneals on continuous annealing line after cold rolling, and 760-800 DEG C of equal thermal annealing temperatures delay
It is rapidly cooled after cold, 25-50 DEG C of cooling velocity/s, obtains 400MPa grades of tensile strength of steel plate.The patent at setting up separately
C content is lower in meter, and Mn content is high, and the steel plate yield tensile ratio of acquisition is low, is suitble to manufacture to punching press and the higher part of welding requirements,
But cost of alloy is high.
Carbon manganese structural steel composition production method disclosed in Chinese invention patent (application publication number CN103509996A), chemistry at
Essential element mass percent is in point：C, 0.10-0.20%；Mn ,≤0.40%；Si ,≤0.30%, ingredient design in improve
C content reduces Mn alloy content, anneals in bell furnace after cold rolling, 650-700 DEG C of annealing temperature, furnace cooling is resisted
The steel plate that 400MPa grades of tensile strength.The patent uses bell-type annealing technique, and production efficiency is low, and plate surface quality is difficult to ensure.
With carbon manganese structural steel composition when manufacturing different types of structural member, the requirement to steel plate ingredient and performance is not consistent.
Relatively simple for some shapes, deflection is few, and part especially not high to welding performance requirement can be contained by increasing carbon
Amount, on the basis of guaranteeing requirement, further decreases Plate Production manufacturing cost.
Summary of the invention
The purpose of the present invention is to provide a kind of yield strength 240MPa level structure cold-rolled steel sheet and preparation method, steel plates
It is designed using carbon manganese ingredient, the yield strength after annealing and being smooth is 240-340MPa, and tensile strength 390-480MPa has no progeny and prolongs
Stretch rate >=29%.
To achieve the above object, the present invention provides the following technical solutions：
The embodiment of the present application discloses a kind of yield strength 240MPa level structure cold-rolled steel sheet, and chemical component presses quality
Percentage is：C：0.15-0.18%, Mn：0.40-0.60%, Si≤0.05%, P≤0.02%, S≤0.01%, Als：
0.02-0.06%, remaining is Fe and other inevitable impurity.
Preferably, in above-mentioned yield strength 240MPa level structure cold-rolled steel sheet, which is 240-
340MPa, tensile strength 390-480MPa, elongation percentage >=29%.
Correspondingly, also disclosing a kind of preparation method of yield strength 240MPa level structure cold-rolled steel sheet, successively include
Following steps：
S1 hot-rolled process, slab heating temperature are 1180-1230 DEG C, and soaking time is 2-3 hours；Finishing temperature is 840-
880 DEG C, coiling temperature is 600-660 DEG C；
S2 pickling and cold continuous rolling process, coils of hot-rolled steel remove scale on surface, cold-rolling of steel plate rolling pressure by pickling
Rate is 60-75%；
After S3 continuous annealing process, cold-rolled steel coils uncoiling and cleaning, anneal in continuous annealing furnace, annealing soak temperature
Degree is 730-760 DEG C, and soaking zone annealing time is 60-110 seconds；Slow cooling section outlet temperature is 670-690 DEG C, cooling velocity 5-
18℃/s；Rapid cooling section outlet temperature is 410-430 DEG C, 15-35 DEG C of cooling velocity/s；Overaging section temperature is 370-400 DEG C；
The smooth process of S4, using the small roller diameter leveling roll of diameter 400-500mm, smooth reduction ratio is 0.8-1.8%.
Preferably, in the preparation method of above-mentioned yield strength 240MPa level structure cold-rolled steel sheet, before step S1
By raw material carry out desulfurization, bessemerize, continuous casting obtains continuous casting billet.
Compared with prior art, the beneficial effects of the invention are that：
(1) it is designed using the low manganese ingredient of high-carbon, improves carbon content in ingredient, reduced expensive Mn alloy content, reduce
Cost of alloy；
(2) it is designed using low Si ingredient, the strength of materials can be improved in addition Si element, but Si content improves latter aspect
The elongation percentage and formability of material can be reduced, another aspect Si easily forms oxide layer in surface of steel plate, to influence surface of steel plate
Quality, therefore, low Si ingredient are easier to obtain high-quality surface；
(3) high reduction ratio is used when cold rolling, rolling is conducive to refine crystal grain under high pressure, obtains additional intensity increment；
(4) continuous annealing heat treatment, compared with bell-type annealing technique, continuous annealing work are carried out using vertical continuous annealing furnace
Skill annealing time is short, high production efficiency, and plate property is stablized, and surface quality is good, and production cost is low.
The cold-rolled steel sheet that ingredient and manufacturing method obtain through the invention, typical metallographic structure are ferrite+a small amount of pearl
Body of light, yield strength 240-340MPa, tensile strength 390-480MPa, elongation after fracture >=29%, forming property is good, surface
Superior in quality, Plate Production is at low cost.
Specific embodiment
Below by a detailed description of the technical solution in the embodiment of the present invention is provided, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
Desulfurization of raw material, bessemerize, that continuous casting obtains continuous casting billet ingredient is following (mass percent)：C, 0.17%；Mn,
0.55%；Si, 0.03%；P, 0.014%；S, 0.0046%；Als, 0.033%；Surplus is Fe and inevitable impurity；
Continuous casting billet is heated to 1200 DEG C, soaking time 150min in walking beam furnace, and finishing temperature is 860 DEG C, adopts
Take leading portion cooling, coiling temperature is 644 DEG C, obtains the coils of hot-rolled steel of 4.5mm thickness；
It obtains 1.5mm thickness by 5 machine frame rolling mill continuous rollings through overpickling after hot rolled coil uncoiling and rolls hard steel volume, cold rolling
Lower amount is 66.7%；
It rolls after hard steel winds off volume, steel plate enters continuous annealing furnace after surface clean, and annealing soak temperature is 745 DEG C,
Hot soaking time 85s；Slow cooling section outlet temperature is 685 DEG C, 8 DEG C/s of cooling velocity；Rapid cooling section outlet temperature is 425 DEG C, cooling
23 DEG C/s of speed；Overaging section temperature is 385 DEG C；
Using the small roller diameter leveling roll of diameter 400-500mm, smooth reduction ratio 1.2%.
Embodiment 2
Desulfurization of raw material, bessemerize, that continuous casting obtains continuous casting billet ingredient is following (mass percent)：C, 0.16%；Mn,
0.47%；Si, 0.04%；P, 0.015%；S, 0.0053%；Als, 0.033%；Surplus is Fe and inevitable impurity；
Continuous casting billet is heated to 1210 DEG C, soaking time 160min in walking beam furnace, and finishing temperature is 855 DEG C, adopts
Take leading portion cooling, coiling temperature is 638 DEG C, obtains the coils of hot-rolled steel of 4.0mm thickness；
It obtains 1.2mm thickness by 5 machine frame rolling mill continuous rollings through overpickling after hot rolled coil uncoiling and rolls hard steel volume, cold rolling
Lower amount is 70%；
It rolls after hard steel winds off volume, steel plate enters continuous annealing furnace after surface clean, and annealing soak temperature is 745 DEG C,
Hot soaking time 70s；Slow cooling section outlet temperature is 685 DEG C, 10 DEG C/s of cooling velocity；Rapid cooling section outlet temperature is 423 DEG C, cooling
27 DEG C/s of speed；Overaging section temperature is 380 DEG C；
Using the small roller diameter leveling roll of diameter 400-500mm, smooth reduction ratio 1.0%.
The mechanical property for the yield strength 240MPa level structure cold-rolled steel sheet that embodiment 1-2 is obtained is as follows：
| Embodiment | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Embodiment 1 | 310 | 438 | 33 |
| Embodiment 2 | 285 | 415 | 34 |
The technical concepts and features of above-described embodiment only to illustrate the invention, its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of yield strength 240MPa level structure cold-rolled steel sheet, which is characterized in that its chemical component is by mass percentage：
C：0.15-0.18%, Mn：0.40-0.60%, Si≤0.05%, P≤0.02%, S≤0.01%, Als：0.02-0.06%,
Remaining is Fe and other inevitable impurity.
2. yield strength 240MPa level structure cold-rolled steel sheet according to claim 1, which is characterized in that steel plate surrender
Intensity is 240-340MPa, tensile strength 390-480MPa, elongation percentage >=29%.
3. the preparation method of yield strength 240MPa level structure cold-rolled steel sheet as described in claim 1, which is characterized in that according to
It is secondary to include the following steps：
S1 hot-rolled process, slab heating temperature are 1180-1230 DEG C, and soaking time is 2-3 hours；Finishing temperature is 840-880
DEG C, coiling temperature is 600-660 DEG C；
S2 pickling and cold continuous rolling process, coils of hot-rolled steel remove scale on surface by pickling, and cold-rolling of steel plate rolling reduction ratio is
60-75%；
After S3 continuous annealing process, cold-rolled steel coils uncoiling and cleaning, anneal in continuous annealing furnace, annealing soak temperature is
730-760 DEG C, soaking zone annealing time is 60-110 seconds；Slow cooling section outlet temperature is 670-690 DEG C, cooling velocity 5-18
℃/s；Rapid cooling section outlet temperature is 410-430 DEG C, 15-35 DEG C of cooling velocity/s；Overaging section temperature is 370-400 DEG C；
The smooth process of S4, using the small roller diameter leveling roll of diameter 400-500mm, smooth reduction ratio is 0.8-1.8%.
4. the preparation method of yield strength 240MPa level structure cold-rolled steel sheet according to claim 3, which is characterized in that
Before step S1 by raw material carry out desulfurization, bessemerize, continuous casting obtains continuous casting billet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810782328.1A CN108866451A (en) | 2018-07-17 | 2018-07-17 | Yield strength 240MPa level structure cold-rolled steel sheet and preparation method |
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| CN201810782328.1A CN108866451A (en) | 2018-07-17 | 2018-07-17 | Yield strength 240MPa level structure cold-rolled steel sheet and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117758A (en) * | 2019-05-31 | 2019-08-13 | 张家港扬子江冷轧板有限公司 | Meter case part of low-temperature impact-resistant and preparation method thereof |
| CN111215590A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | Thin-gauge cold-rolled low-alloy high-strength steel and production method thereof based on double-roller casting rolling |
| CN111304540A (en) * | 2020-04-10 | 2020-06-19 | 山东钢铁集团日照有限公司 | Cold-rolled steel strip for 280 Mpa-grade automobile structure and manufacturing method thereof |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
| CN113684419A (en) * | 2021-08-11 | 2021-11-23 | 山东钢铁集团日照有限公司 | Low-cost 400 MPa-grade cold-rolled continuous annealing steel strip and production method thereof |
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| JPH04268016A (en) * | 1991-02-20 | 1992-09-24 | Kobe Steel Ltd | Production of high tensile strength steel sheet for door guide bar having excellent crushing characteristic |
| JPH07126806A (en) * | 1993-11-04 | 1995-05-16 | Kawasaki Steel Corp | Steel sheet for can excellent in corrosion resistance and its production |
| CN104046889A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | Cold-rolled continuous-annealed steel strip for guide rails and production method thereof |
| CN104694818A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团西昌钢钒有限公司 | Production method for carbon structural steel cold-roll steel sheets |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
-
2018
- 2018-07-17 CN CN201810782328.1A patent/CN108866451A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04268016A (en) * | 1991-02-20 | 1992-09-24 | Kobe Steel Ltd | Production of high tensile strength steel sheet for door guide bar having excellent crushing characteristic |
| JPH07126806A (en) * | 1993-11-04 | 1995-05-16 | Kawasaki Steel Corp | Steel sheet for can excellent in corrosion resistance and its production |
| CN104046889A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | Cold-rolled continuous-annealed steel strip for guide rails and production method thereof |
| CN104694818A (en) * | 2015-03-26 | 2015-06-10 | 攀钢集团西昌钢钒有限公司 | Production method for carbon structural steel cold-roll steel sheets |
| CN104988389A (en) * | 2015-07-30 | 2015-10-21 | 武汉钢铁(集团)公司 | Automobile alloyed hot-dip galvanized steel with tensile strength of 340 MPa grade and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117758A (en) * | 2019-05-31 | 2019-08-13 | 张家港扬子江冷轧板有限公司 | Meter case part of low-temperature impact-resistant and preparation method thereof |
| CN110117758B (en) * | 2019-05-31 | 2021-05-04 | 张家港扬子江冷轧板有限公司 | Low-temperature impact resistant instrument shell part and preparation method thereof |
| CN111304540A (en) * | 2020-04-10 | 2020-06-19 | 山东钢铁集团日照有限公司 | Cold-rolled steel strip for 280 Mpa-grade automobile structure and manufacturing method thereof |
| CN111215590A (en) * | 2020-04-16 | 2020-06-02 | 江苏沙钢集团有限公司 | Thin-gauge cold-rolled low-alloy high-strength steel and production method thereof based on double-roller casting rolling |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
| CN113684419A (en) * | 2021-08-11 | 2021-11-23 | 山东钢铁集团日照有限公司 | Low-cost 400 MPa-grade cold-rolled continuous annealing steel strip and production method thereof |
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