CN105734422B - The production method of the effective hot rolled strip of cold rolling thin-walled - Google Patents
The production method of the effective hot rolled strip of cold rolling thin-walled Download PDFInfo
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- CN105734422B CN105734422B CN201610173224.1A CN201610173224A CN105734422B CN 105734422 B CN105734422 B CN 105734422B CN 201610173224 A CN201610173224 A CN 201610173224A CN 105734422 B CN105734422 B CN 105734422B
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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
- 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
- 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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- 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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
-
- 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
- C21D2211/009—Pearlite
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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)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to metallurgical technology field, a kind of finished product tensile strength obtained and the production method of the higher effective hot rolled strip of cold rolling thin-walled of elongation percentage are specifically disclosed.This method includes steel billet processed, heating steel billet, hot rolling, cools down and batch step；The weight percent of each chemical composition is in obtained steel billet：C 0.04~0.07%, Si 0.06~0.10%, Mn 0.2~0.25%, P 0~0.025%, S 0~0.025%, V 0.01~0.015%, Ti 0~0.005%, Cr 0~0.03%, Ni 0~0.03%, surplus are Fe and inevitable impurity；In heating steel billet step, billet heating temperature is 1150~1180 DEG C, when heating time is 1~3 small；In hot-rolled step, at 1150~1160 DEG C, finish rolling finishing temperature is controlled at 870~950 DEG C the control of breaking down temperature；Cooling step, which uses, rolls rear leading portion laminar flow water cooling；The temperature for batching step is controlled at 650~680 DEG C.Finished steel sheet yield strength >=300MPa that the method for the present invention obtains, tensile strength >=380MPa, elongation percentage >=40% have good cold-bending property and welding performance.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of production method of the effective hot rolled strip of cold rolling thin-walled.
Background technology
Thin-wall tube is the abbreviation of thin-wall steel tube, refers to the steel pipe that the ratio between outer diameter and pipe thickness are more than 20, usually by cold
It rolls and (pulls out) and form.Hot rolled strip as cold rolling thin-wall tube pipe is usually obtained by cold formability steel, generally use the trade mark for
The steel of Q235B is manufactured.Q235B steel chemical compositions are by weight comprising little in the requirement of national standard GB/T 700-2006 standards
C in 0.12%, the Si no more than 0.35%, the Mn no more than 1.4%, the P no more than 0.04 and S and surplus Fe and not
Evitable impurity；Wherein, it is specified that yield strength is required not less than 235MPa, tensile strength 370 in the mechanical property of requirement
~500MPa, elongation after fracture are not less than 26%.However, the hot rolled strip as cold rolling thin-wall tube pipe needs preferable tension
Intensity and elongation percentage tend not to meet above-mentioned technical conditions using its mechanical property of hot rolled strip made from existing production method
It is required that, it is difficult to for making cold rolling thin-wall tube.
The content of the invention
The technical problem to be solved in the present invention is to provide higher cold of a kind of finished product tensile strength obtained and elongation percentage
Roll the production method of the effective hot rolled strip of thin-walled.
The technical solution adopted by the present invention to solve the technical problems is：The producer of the effective hot rolled strip of cold rolling thin-walled
Method including steel billet step processed, further includes heating steel billet, hot rolling, cools down and batches step；Each chemical composition in obtained steel billet
Weight percent be：C 0.04~0.07%, Si 0.06~0.10%, Mn 0.2~0.25%, P 0~0.025%, S 0
~0.025%, V 0.01~0.015%, Ti 0~0.005%, Cr 0~0.03%, Ni 0~0.03%, surplus for Fe and
Inevitable impurity；
In heating steel billet step, billet heating temperature is 1150~1180 DEG C, when heating time is 1~3 small；
In hot-rolled step, at 1150~1160 DEG C, finish rolling finishing temperature is controlled at 870~950 DEG C the control of breaking down temperature；
Cooling step, which uses, rolls rear leading portion laminar flow water cooling；
The temperature for batching step is controlled at 650~680 DEG C.
Wherein, steel billet may be employed well known to a person skilled in the art method by blast-melted through converter smelting, LF refining
It is made with continuous casting working procedure.
It is further that the weight percent of each chemical composition is in obtained steel billet：C 0.05~0.06%, Si
0.07~0.09%, Mn 0.22~0.24%, P 0~0.020%, S 0~0.020%, V 0.012~0.014%, Ti
0.002~0.005%, Cr 0.02~0.03%, Ni 0.02~0.03%, surplus are Fe and inevitable impurity；
In heating steel billet step, billet heating temperature is 1155~1175 DEG C, when heating time is 1.5~2 small；
In hot-rolled step, at 1155~1160 DEG C, finish rolling finishing temperature is controlled at 890~920 DEG C the control of breaking down temperature；
The temperature for batching step is controlled at 660~670 DEG C.
It is further that in cooling step, cooling velocity is 10~30 DEG C/s.
It is further that in hot-rolled step, the rolling pass of finish rolling is six, and rolling is so that the thickness point of intermediate base successively
It Wei not be 40~30 millimeters, 30~22 millimeters, 22~16 millimeters, 16~11 millimeters, 11~7 millimeters and 7~5 millimeters.
Ferrite and pearly-lustre are included by the effective hot rolled strip heterogeneous microstructure of cold rolling thin-walled made from the method for the present invention
Body, grain size is 9~10 grades, and on the basis of crystal structure total volume, ferritic percentage by volume is 60~80%, pearlite
Percentage by volume be 20~40%.Ferrite refers to that C is dissolved in the interstitial solid solution formed in α-Fe, has body-centered cubic
Crystal structure.Pearlite is one of metallographic form of steel, and the isothermal transformation product of steel overcooling austenite, constituent is (by weight
Than meter) α-Fe account for 60~80%, Fe3C accounts for 20~40%, and shape is divided into sheet and granular (cools down speed with steel overcooling austenite
It spends related).For mild steel, lamellar pearlite is usually formed after the uniform austenite cooling of chemical composition, if Ovshinsky
Body uneven components when especially having secondary cementite remaining, can form granular pearlite.The volume hundred of ferrite and pearlite
Fraction may be employed that well known to a person skilled in the art methods to measure, such as 6394 metallographic methods of GB/T.
The beneficial effects of the invention are as follows：The method of the present invention is by controlling the chemical composition, billet heating temperature, hot rolling of steel billet
The working conditions such as temperature, cooling technique and coiling temperature, make by the method for the present invention produce hot rolled strip yield strength >=
300MPa, tensile strength >=380MPa, elongation percentage >=40% have good cold-bending property and welding performance, are particularly suitable for using
In making cold rolling thin-wall tube.Under same process conditions, with the same level produced using high Mn or Micro-Nb alloyization processing steel
Hot rolled strip is compared, and the hot rolled strip of the method for the present invention production has apparent cost advantage；Through measuring and calculating, production cost and height
Mn or Micro-Nb alloyization processing steel are compared, and production cost difference is 15 yuan/ton and 30 yuan/ton low.The production technology that the present invention uses
Simply, end properties obtained are superior, production cost is relatively low, have higher cost performance.
Specific embodiment
The technological process of the production method of the effective hot rolled strip of cold rolling thin-walled includes：Steel billet → heating steel billet → hot rolling processed →
It cools down → batches；
Wherein, steel billet step processed can be used well known to a person skilled in the art method through converter smelting, LF refining and continuous casting
Steel billet is made in process；Such as：Converter smelting process is specially to smelt blast-melted and smelting furnace material in converter to obtain molten steel,
Then by deoxidation of molten steel and alloying is carried out；In alloying step by carbonaceous material, silicomanganese, ferrosilicon, ferrochrome, nickel plate, vanadium iron,
The alloys such as ferrotianium are added in the molten steel after deoxidation, are obtained molten steel and are (by weight percentage)：C 0.04~0.07%, Si
0.06~0.1%, Mn 0.2~0.25%, P 0~0.025%, S 0~0.025%, V 0.01~0.015%, Ti 0~
0.005%, Cr 0~0.03%, Ni 0~0.03%, surplus are Fe and inevitable impurity；In order to make S in feed stock for blast furnace
Content be less than or equal to 0.025% into stove molten iron total weight, low-sulfur molten iron or semisteel smelting may be employed.It is golden in order to prevent
Belong to the scaling loss of element especially manganese element, strictly to control oxygen activity when smelting process temperature and tapping.Smelting process is added
The carbonaceous material that is known in the art of carbonaceous material, be preferably one or more of pitch coke, anthracite and carbon dust.It smelts
Time for conventional smelting time.The oxygen activity, degree of purity and temperature of molten steel are finely adjusted by LF refining process.Even
Foundry work sequence can be that the molten steel after refining is cast into the tundish roasted in advance, and the continuous casting machine protected through whole process pours
Cast slab；It after casting, can conventionally be cooled down, such as natural cooling at room temperature.
The weight percent of each chemical composition is in obtained steel billet：C 0.04~0.07%, Si 0.06~0.1%,
Mn 0.2~0.25%, P 0~0.025%, S 0~0.025%, V 0.01~0.015%, Ti 0~0.005%, Cr 0~
0.03%, Ni 0~0.03%, surplus are Fe and inevitable impurity；
Heating steel billet step is at 1150~1180 DEG C, when small to heating steel billet 1~3 by heating and temperature control；
Hot-rolled step is that the steel billet after heating is carried out high temperature rolling, and the purpose of rolling is to make the effective hot-rolled steel of cold rolling thin-walled
Band reaches required thickness.In the method for the present invention hot-rolled step, the control of breaking down temperature is at 1150~1160 DEG C, finish rolling finishing temperature
Control is at 870~950 DEG C；In general, the rolling pass of finish rolling is six, successively rolling so that among base thickness be respectively 40~
30 millimeters, 30~22 millimeters, 22~16 millimeters, 16~11 millimeters, 11~7 millimeters and 7~5 millimeters；
For the effective hot rolled strip of cold rolling thin-walled, generally require after rolling through the tissue shape inside cooling adjustment steel
State, then batch coiled.In order to meet the tissue of hot rolled strip and performance requirement, the steel band come out from milling train must be when very short
In, under very high cooling velocity being cooled to coiling temperature is batched.Rear leading portion laminar flow is rolled in general, being used immediately after hot rolling
Hot rolled strip is cooled fast to 650~680 DEG C and batched by water cooling, in cooling step cooling velocity be preferably 10~30 DEG C/
s。
As a preferred embodiment of the present invention, the production method of the effective hot rolled strip of cold rolling thin-walled, obtained steel
The weight percent of each chemical composition is in base：C 0.05~0.06%, Si 0.07~0.09%, Mn 0.22~0.24%, P
0~0.020%, S 0~0.020%, V 0.012~0.014%, Ti 0.002~0.005%, Cr 0.02~0.03%, Ni
0.02~0.03%, surplus is Fe and inevitable impurity；
In heating steel billet step, billet heating temperature is 1155~1175 DEG C, when heating time is 1.5~2 small；
In hot-rolled step, at 1155~1160 DEG C, finish rolling finishing temperature is controlled at 890~920 DEG C the control of breaking down temperature；
The temperature for batching step is controlled at 660~670 DEG C.
In general, the technological process of the production method of the effective hot rolled strip of cold rolling thin-walled further includes finishing and packaging and storage.
The invention will be further described with comparative example by the following examples.
Embodiment 1
The blast-melted weight percent through each chemical composition in steel billet made from converter smelting, LF refining, continuous casting working procedure
For：C 0.05%, Si 0.08%, Mn 0.22%, P 0.016%, S 0.014%, V 0.012%, Ti 0.003%, Cr
0.015%, Ni 0.015%, surplus are Fe and inevitable impurity；Heating temperature of the steel billet in heating furnace is 1165 DEG C,
Heating time is 65 minutes, 1157 DEG C of breaking down temperature, and finish rolling finishing temperature is 915 DEG C, and coiling temperature is 665 DEG C, hot-rolled finished product
Thickness is 5.0 millimeters.The effective hot rolled strip of the cold rolling thin-walled prepared is subjected to mechanical performance detection, finished product yield strength
340MPa, tensile strength 400MPa, elongation percentage 43%, cold-bending property is good, and steel plate welding performance is good, complies fully with national standard
GB/T 700-2006 standards are to the mechanical property requirements of straight carbon steel, particularly suitable for making cold rolling thin-wall tube.
Embodiment 2
The blast-melted weight percent through each chemical composition in steel billet made from converter smelting, LF refining, continuous casting working procedure
For：C 0.04%, Si 0.06%, Mn 0.2%, P 0.012%, S 0.011%, V 0.01%, Ti 0.001%, Cr：
0.01%, Ni 0.01%, surplus are Fe and inevitable impurity；Heating temperature of the steel billet in heating furnace is 1160 DEG C, is added
Hot 130 minutes time, 1155 DEG C of breaking down temperature, finishing temperature are 910 DEG C, and coiling temperature is 660 DEG C, and hot-rolled finished product thickness is
5.0 millimeter.The effective hot rolled strip of the cold rolling thin-walled prepared is subjected to mechanical performance detection, finished product yield strength 330MPa resists
Tensile strength 390MPa, elongation percentage 40%, cold-bending property is good, and steel plate welding performance is good, complies fully with national standard GB/T 700-
2006 standards are to the mechanical property requirements of straight carbon steel, particularly suitable for making cold rolling thin-wall tube.
Embodiment 3
The blast-melted weight percent through each chemical composition in steel billet made from converter smelting, LF refining, continuous casting working procedure
For：C 0.07%, Si 0.09%, Mn 0.25%, P 0.025%, S 0.017%, V 0.015%, Ti 0.004%, Cr
0.03%, Ni 0.025%, surplus are Fe and inevitable impurity；Heating temperature of the steel billet in heating furnace is 1175 DEG C,
100 minutes heating times, 1160 DEG C of breaking down temperature, finishing temperature are 950 DEG C, and coiling temperature is 680 DEG C, and hot-rolled finished product thickness is
5.0 millimeter.The effective hot rolled strip of the cold rolling thin-walled prepared is subjected to mechanical performance detection, finished product yield strength 350MPa resists
Tensile strength 430MPa, elongation percentage 44%, cold-bending property is good, and steel plate welding performance is good, complies fully with national standard GB/T 700-
2006 standards are to the mechanical property requirements of straight carbon steel, particularly suitable for making cold rolling thin-wall tube.
Comparative example
Steel billet ingredient is identical with embodiment 1.Heating temperature of the steel billet in heating furnace is 1250 DEG C, heating time
200 minutes, 1230 DEG C of breaking down temperature, finishing temperature was 1050 DEG C, and coiling temperature is 800 DEG C, and hot-rolled finished product thickness is 5.0 millis
Rice.The coiled sheet prepared is subjected to mechanical performance detection, finished product yield strength 200MPa, tensile strength 350MPa, elongation percentage
25%, do not meet mechanical property requirements of the national standard GB/T 700-2006 standards to straight carbon steel, it is difficult to for making cold rolling thin-walled
Pipe.
Claims (5)
1. the production method of the effective hot rolled strip of cold rolling thin-walled, including steel billet step processed, it is characterised in that：Steel billet is further included to add
Heat, hot rolling cool down and batch step；The weight percent of each chemical composition is in obtained steel billet：C 0.05~0.06%,
Si0.07~0.09%, Mn 0.22~0.24%, P 0~0.02%, S 0~0.02%, V 0.012~0.014%, Ti
0.002~0.005%, Cr 0.02~0.03%, Ni 0.02~0.03%, surplus are Fe and inevitable impurity；
In heating steel billet step, billet heating temperature is 1150~1180 DEG C, when heating time is 1~3 small；
In hot-rolled step, at 1150~1160 DEG C, finish rolling finishing temperature is controlled at 870~950 DEG C the control of breaking down temperature；
Cooling step, which uses, rolls rear leading portion laminar flow water cooling；
The temperature for batching step is controlled at 650~680 DEG C.
2. the production method of the effective hot rolled strip of cold rolling thin-walled as described in claim 1, it is characterised in that：Heating steel billet step
In, billet heating temperature is 1155~1175 DEG C, when heating time is 1.5~2 small；
In hot-rolled step, at 1155~1160 DEG C, finish rolling finishing temperature is controlled at 890~920 DEG C the control of breaking down temperature；
The temperature for batching step is controlled at 660~670 DEG C.
3. the production method of the effective hot rolled strip of cold rolling thin-walled as claimed in claim 1 or 2, it is characterised in that：Cooling step
In, cooling velocity is 10~30 DEG C/s.
4. the production method of the effective hot rolled strip of cold rolling thin-walled as claimed in claim 1 or 2, it is characterised in that：Hot-rolled step
In, the rolling pass of finish rolling is six, successively rolling so that among base thickness be respectively 40~30 millimeters, 30~22 millimeters,
22~16 millimeters, 16~11 millimeters, 11~7 millimeters and 7~5 millimeters.
5. the production method of the effective hot rolled strip of cold rolling thin-walled as described in claim 1, it is characterised in that：Steel billet is mainly by height
Stove molten iron is made through converter smelting, LF refining and continuous casting working procedure.
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| CN106222385B (en) * | 2016-07-22 | 2018-08-24 | 武汉钢铁有限公司 | The production method of high carbon tool steel hot rolled steel sheet |
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| CN1107521A (en) * | 1994-02-25 | 1995-08-30 | 日本铸锻钢株式会社 | High strength hot rolled steel plates and sheets excellent in uniform elongation after cold working and process for producing the same |
| CN1225690A (en) * | 1997-04-30 | 1999-08-11 | 川崎制铁株式会社 | Steel material having high ductility and high strength and process for producing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104313461A (en) * | 2014-11-13 | 2015-01-28 | 攀钢集团西昌钢钒有限公司 | Cold-rolled steel plate for car structure and manufacturing method thereof |
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| CN1107521A (en) * | 1994-02-25 | 1995-08-30 | 日本铸锻钢株式会社 | High strength hot rolled steel plates and sheets excellent in uniform elongation after cold working and process for producing the same |
| CN1225690A (en) * | 1997-04-30 | 1999-08-11 | 川崎制铁株式会社 | Steel material having high ductility and high strength and process for producing same |
| CN103160654A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Manufacturing method of ultrahigh-strength surface active steel plate and steel plate thereof |
| CN105308203A (en) * | 2013-07-01 | 2016-02-03 | 新日铁住金株式会社 | Cold-rolled steel sheet, galvanized cold-rolled steel sheet, and method for producing same |
| CN103627951A (en) * | 2013-12-06 | 2014-03-12 | 马钢(集团)控股有限公司 | High-toughness boracic carbon structural steel plate roll and production method thereof |
| CN104928595A (en) * | 2015-07-07 | 2015-09-23 | 南京钢铁股份有限公司 | Band steel with good cold forming performance and for automobile structure and production process thereof |
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