CN110252804A - The production method of hot continuous rolling production thin gauge ultra-low-carbon steel - Google Patents
The production method of hot continuous rolling production thin gauge ultra-low-carbon steel Download PDFInfo
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- CN110252804A CN110252804A CN201910362845.8A CN201910362845A CN110252804A CN 110252804 A CN110252804 A CN 110252804A CN 201910362845 A CN201910362845 A CN 201910362845A CN 110252804 A CN110252804 A CN 110252804A
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- low
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- carbon steel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of production methods of hot continuous rolling production thin gauge ultra-low-carbon steel, including heating, roughing, finish rolling, batch, storage step, wherein heating is divided into 4 sections, preheating section, one plus, two adduction soaking zones；Roughing passage is 8~10 times, and roughing outlet temperature is 860~910 DEG C, and workpiece thickness is 28~35mm；Finish rolling is carried out after roughing, entry temperature at finishing is 800~880 DEG C, and exit temperature at finishing is 740~800 DEG C, and finish rolling F1~F7 need to put into lubrication and rolling, using air-cooled after finish rolling；Coiling temperature is 700~740 DEG C, is batched offline afterwards using stacking slow cooling or button cover slow cooling, subsequent steel coils packing.Thin gauge hot rolling ultra-low-carbon steel intensity produced by the invention is low, elongation percentage is high, yield tensile ratio is low, n value, r value height, advantageously reduces cold rolling load and improves the forming property of cold rolling finished product.
Description
Technical field
The present invention relates to a kind of production methods of steel, and in particular to a kind of production of hot continuous rolling production thin gauge ultra-low-carbon steel
Method belongs to technical field of steel strip production.
Background technique
Ultra-low-carbon steel is and general because its lower intensity, good forming property are widely used in the industries such as automobile, household electrical appliances
It is applied with thin gauge.Since austenite is higher to ferritic phase temperature (Ar3 temperature), and temperature when rolling thin slab product
Drop it is larger so that hot continuous rolling is easy to appear mixed crystal phenomenon (finishing temperature is fallen into when producing thin gauge (thickness < 2mm) ultra-low-carbon steel
Two-phase section), especially edge and surface, mixed crystal can seriously endanger the plate shape and forming property of product.Therefore, hot continuous rolling producing line one
As can only produce the ultra-low-carbon steel of thickness 2mm or more.Currently, thin gauge ultra-low-carbon steel needs to be thinned to institute in cold rolling producing line
Thickness is needed, production procedure is long, at high cost.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, a kind of hot continuous rolling production thin gauge Ultra-low carbon is provided
The production method of steel solves the problems, such as that hot continuous rolling production thin gauge ultra-low-carbon steel is easy to appear mixed crystal, and extension hot continuous rolling production is super
The thickness specification of mild steel is, it can be achieved that " with hot Dai Leng " or reduction cold rolling reduction ratio, reduce production cost, realize green manufacturing.
The present invention is specifically achieved in that
A kind of production method of hot continuous rolling production thin gauge ultra-low-carbon steel, including heating, roughing, finish rolling, batch, be put in storage step
Suddenly, specifically:
(1) it heats
Heating is divided into 4 sections, preheating section, one plus, two adduction soaking zones, preheating section temperature is 820~890 DEG C, preheating section
Time is 70~120min；One heating degree is 950~1000 DEG C, 30~50min of heating time；Two heating degree are 1010~1060
DEG C, heating time is 20~40min, and soaking section temperature is 1050~1100 DEG C, and soaking time is 20~40min.
(2) roughing
Roughing passage is 8~10 times, and roughing outlet temperature is 860~910 DEG C, and workpiece thickness is 28~35mm.
(3) finish rolling
Finish rolling is carried out after roughing, entry temperature at finishing is 800~880 DEG C, and exit temperature at finishing is 740~800 DEG C,
Finish rolling F1~F7 need to put into lubrication and rolling, using air-cooled after finish rolling.
(4) it batches
Coiling temperature is 700~740 DEG C, is batched offline afterwards using stacking slow cooling or button cover slow cooling, subsequent steel coils packing.
Further scheme is:
Roughing outlet temperature is 860~890 DEG C；
Further scheme is:
Entry temperature at finishing is 800~830 DEG C；
Further scheme is:
Exit temperature at finishing is 740~760 DEG C.
The ultra-low-carbon steel that the present invention is directed to is grouped as by the group of following parts by weight: C≤0.04%, Si≤0.1%, Mn≤
0.3%, P≤0.020%, S≤0.010%, Ti≤0.1%, Nb≤0.1%, Cr≤0.5%, B≤0.003%, remaining is iron
With inevitable impurity.
It is raw to provide a kind of hot continuous rolling aiming at the problem that hot continuous rolling production thin gauge ultra-low-carbon steel is easy to produce mixed crystal by the present invention
The production method of thin gauge ultra-low-carbon steel is produced, the present invention has the following technical effect that:
(1) by adjusting roughing and final rolling temperature system, make austenite before finish rolling or finish rolling upstream stand changes completely
For ferrite, avoid in finish rolling Final Stand Rolling in two-phase section to cause mixed crystal.
(2) by adjusting heating cycle, the uniform low temperature casting blank of temperature is obtained, avoids roughing roll-force excessively high, and reduce
To temperature or pendulum steel time before the finish rolling of entry temperature at finishing needed for obtaining, production efficiency is improved.
(3) this method heating temperature is low, can effectively reduce heating energy consumption and iron scale scaling loss, improves lumber recovery, in addition,
Compared with existing production technology, using the thin gauge hot rolling ultra-low-carbon steel intensity of this technique production is low, elongation percentage is high, yield tensile ratio
Low, n value, r value are high, advantageously reduce cold rolling load and improve the forming property of cold rolling finished product.
Detailed description of the invention
Fig. 1 is the tissue topography that 1.5mm hot rolling ultra-low-carbon steel is produced using this method, is uniform ferritic structure；
Fig. 2 is the tissue topography that 1.5mm hot rolling ultra-low-carbon steel is produced using existing method, is coarse grain and fine grain mixed crystal
Tissue.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
The production method of hot continuous rolling production thin gauge ultra-low-carbon steel provided in an embodiment of the present invention, including heating, roughing, essence
It rolls, batch, storage step.Main production method steps are identical with process, the different ultra-low-carbon steels for being each embodiment
Ingredient, heating, rolling technological parameter and final mechanical property have differences.Meanwhile the present invention also provides comparative examples
The related datas such as ultra-low-carbon steel ingredient, heating, rolling technological parameter.
The chemical component of ultra-low-carbon steel, heating, rolling mill practice and mechanical property are respectively such as table in each embodiment and comparative example
Shown in 1,2,3 and 4.
The steel billet chemical component (by mass percentage, wt%) of each embodiment and comparative example of table 1
| C | Si | Mn | P | S | Ti | Nb | Cr | B | |
| Embodiment 1 | 0.011 | 0.08 | 0.2 | 0.015 | 0.0074 | 0.033 | 0.072 | 0.14 | 0.0019 |
| Embodiment 2 | 0.028 | 0.07 | 0.13 | 0.016 | 0.0058 | 0.054 | 0.005 | 0.12 | 0.0011 |
| Embodiment 3 | 0.04 | 0.07 | 0.29 | 0.012 | 0.0061 | 0.026 | 0.079 | 0.44 | 0.0022 |
| Embodiment 4 | 0.019 | 0.05 | 0.1 | 0.012 | 0.0039 | 0.053 | 0.006 | 0.2 | 0.0025 |
| Embodiment 5 | 0.033 | 0.03 | 0.23 | 0.01 | 0.0046 | 0.082 | 0.084 | 0.21 | 0.002 |
| Comparative example | 0.03 | 0.06 | 0.2 | 0.015 | 0.005 | 0.061 | 0.05 | 0.19 | 0.0012 |
The heating process (temperature: DEG C, time: min) of each embodiment and comparative example of table 2
The rolling mill practice (temperature, DEG C) of each embodiment and comparative example of table 3
| Roughing passage | Roughing outlet temperature | Workpiece thickness | Entry temperature at finishing | Exit temperature at finishing | Coiling temperature | |
| Embodiment 1 | 8 | 907 | 34 | 862 | 768 | 728 |
| Embodiment 2 | 10 | 885 | 35 | 875 | 768 | 719 |
| Embodiment 3 | 8 | 873 | 34 | 800 | 773 | 737 |
| Embodiment 4 | 9 | 898 | 32 | 871 | 798 | 730 |
| Embodiment 5 | 10 | 900 | 30 | 840 | 766 | 740 |
| Comparative example | 8 | 1010 | 36 | 940 | 880 | 680 |
The mechanical property of each embodiment and comparative example of table 4
| Yield strength MPa | Tensile strength MPa | Elongation percentage % | Yield tensile ratio | n | R value | |
| Embodiment 1 | 130 | 263 | 43 | 0.4 | 0.3 | 1.3 |
| Embodiment 2 | 113 | 256 | 42 | 0.42 | 0.33 | 1.2 |
| Embodiment 3 | 118 | 274 | 43 | 0.41 | 0.3 | 1 |
| Embodiment 4 | 104 | 273 | 44 | 0.44 | 0.3 | 1.3 |
| Embodiment 5 | 122 | 282 | 43 | 0.4 | 0.34 | 1.2 |
| Comparative example | 150 | 310 | 40 | 0.6 | 0.25 | 0.6 |
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiment of the present invention are not limited by the above embodiments, it should be appreciated that those skilled in the art
Member can be designed that a lot of other modification and implementations, these modifications and implementations will fall in principle disclosed in the present application
Within scope and spirit.
Claims (5)
1. a kind of production method of hot continuous rolling production thin gauge ultra-low-carbon steel, including heating, roughing, finish rolling, batches, is put in storage step
Suddenly, it is characterised in that:
(1) it heats
Heating is divided into 4 sections, preheating section, one plus, two adduction soaking zones, preheating section temperature is 820~890 DEG C, the preheating section time
For 70~120min；One heating degree is 950~1000 DEG C, 30~50min of heating time；Two heating degree are 1010~1060 DEG C,
Heating time is 20~40min, and soaking section temperature is 1050~1100 DEG C, and soaking time is 20~40min；
(2) roughing
Roughing passage is 8~10 times, and roughing outlet temperature is 860~910 DEG C, and workpiece thickness is 28~35mm；
(3) finish rolling
Finish rolling is carried out after roughing, entry temperature at finishing is 800~880 DEG C, and exit temperature at finishing is 740~800 DEG C, finish rolling
F1~F7 need to put into lubrication and rolling, using air-cooled after finish rolling；
(4) it batches
Coiling temperature is 700~740 DEG C, is batched offline afterwards using stacking slow cooling or button cover slow cooling, subsequent steel coils packing.
2. the production method of hot continuous rolling production thin gauge ultra-low-carbon steel according to claim 1, it is characterised in that:
Roughing outlet temperature is 860~890 DEG C.
3. the production method of hot continuous rolling production thin gauge ultra-low-carbon steel according to claim 2, it is characterised in that:
Entry temperature at finishing is 800~830 DEG C.
4. the production method of hot continuous rolling production thin gauge ultra-low-carbon steel according to claim 3, it is characterised in that:
Exit temperature at finishing is 740~760 DEG C.
5. special according to claim 1 to the production method of the production thin gauge ultra-low-carbon steel of hot continuous rolling described in 4 any claims
Sign is: the ultra-low-carbon steel is grouped as by the group of following parts by weight: C≤0.04%, Si≤0.1%, Mn≤0.3%, P≤
0.020%, S≤0.010%, Ti≤0.1%, Nb≤0.1%, Cr≤0.5%, B≤0.003%, remaining for iron and inevitably it is miscellaneous
Matter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041378A (en) * | 2019-11-18 | 2020-04-21 | 武汉钢铁有限公司 | Steel for easily-formed commercial vehicle beam and production method thereof |
| CN115478208A (en) * | 2021-05-31 | 2022-12-16 | 宝山钢铁股份有限公司 | Thin-specification high-formability stamping steel based on CSP production line and preparation method thereof |
| CN115478231A (en) * | 2021-05-31 | 2022-12-16 | 宝山钢铁股份有限公司 | Hot-rolled pickled plate for compressor shell with ultimate drawing ratio of more than or equal to 2.2 and manufacturing method thereof |
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| CN102896161A (en) * | 2012-10-22 | 2013-01-30 | 河北省首钢迁安钢铁有限责任公司 | Method for removing steel hot rolling oxidized iron sheets for boracic cold rolling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041378A (en) * | 2019-11-18 | 2020-04-21 | 武汉钢铁有限公司 | Steel for easily-formed commercial vehicle beam and production method thereof |
| CN115478208A (en) * | 2021-05-31 | 2022-12-16 | 宝山钢铁股份有限公司 | Thin-specification high-formability stamping steel based on CSP production line and preparation method thereof |
| CN115478231A (en) * | 2021-05-31 | 2022-12-16 | 宝山钢铁股份有限公司 | Hot-rolled pickled plate for compressor shell with ultimate drawing ratio of more than or equal to 2.2 and manufacturing method thereof |
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Application publication date: 20190920 |