CN105834212A - Production technology for hot-rolled coiled plates and hot-rolled coiled plates - Google Patents
Production technology for hot-rolled coiled plates and hot-rolled coiled plates Download PDFInfo
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- CN105834212A CN105834212A CN201610320964.3A CN201610320964A CN105834212A CN 105834212 A CN105834212 A CN 105834212A CN 201610320964 A CN201610320964 A CN 201610320964A CN 105834212 A CN105834212 A CN 105834212A
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
Abstract
The invention relates to a production technology for hot-rolled coiled plates. The production technology comprises the steps of 1, heating; 2, rough rolling; 3, finish rolling; and 4, coiling. In the heating step, steel billets are conveyed into a heating furnace for being heated and are discharged from the furnace after reaching the requirement temperature; in the rough rolling step, the steel billets enter a roughing mill for being rolled three passes in a reciprocating mode and become intermediate billets; in the finish rolling step, the intermediate billets enter a finishing mill for being continuously rolled seven passes and become finished products; in the coiling step, the finished products enter a coiling machine for being rolled into rolls and then the hot-rolled coiled plates are obtained. According to the production technology for the hot-rolled coiled plates, five-pass reciprocating rolling of the steel billets in the existing rough milling processes of the hot-rolled coiled plates is reduced to three-pass reciprocating rolling, the time for machining the steel billets into the intermediate billets is shortened, the intermediate billets can enter the next process in a shorter time, the production cycle of rough milling is greatly shortened, the rough milling capacity can be matched with the finish rolling capacity, the coiling capacity and the heating process capacity, and the system capacity can be improved by 40-63% compared with the system capacity of five-pass rough rolling. The invention further relates to the hot-rolled coiled plates produced by the production technology for the hot-rolled coiled plates.
Description
Technical field
The present invention relates to a kind of hot-rolled coil production technology, and utilize the hot-rolled coil that this technique produces.
Background technology
Hot-rolled coil is as raw material with slab (predominantly continuous casting billet), heated after by roughing mills and essence
Milling train group makes strip steel, from last rolling mill of finish rolling hot steel band out by section cooling to setting temperature
Degree, is rolled into steel coil strip by coiling machine, and the steel coil strip after cooling, according to the different demands of user, through not
With finishing line (smooth, aligning, crosscutting or rip cutting, check, weigh, pack and mark etc.)
Process as steel plate, smooth volume and rip cutting strip product.
It is furnished with 2-3 heating furnace, 1 frame roughing mill, 2-3 on 800-1580mm hot-rolled coil production line now
Platform coiling machine, four formants of finish rolling 7 frame tandem rolling.Wherein: heating, finish rolling, batch 3 big units
There is production 40-45 per hour to prop up the ability of steel, and roughing 1 rolling mill back and forth rolls 5 passages and can only give birth to
Producing 26-28 and prop up steel, so roughing production capacity limits whole rolling line yield, and finish rolling such as batches at the big portion of unit
It is no-load running between timesharing.
Summary of the invention
The technical problem to be solved is to provide one can improve system rhythm of production, reduces raw
Product power consumption ratio, increases the hot-rolled coil production technology of production capacity.
The technical scheme is that a kind of hot-rolled coil production technology, bag
Include following operation:
(1) heating: steel billet is delivered to heating furnace heating, comes out of the stove after being added to required temperature；
(2) roughing: steel billet enters roughing mill and back and forth rolls 3 passages, becomes intermediate blank；
(3) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product；
(4) curling: finished product enters coiling machine rolled, obtains hot-rolled coil.
As preferably, dephosphorization before carrying out roughing before roughing: the steel billet after coming out of the stove is delivered to remove by roller-way
Phosphorus machine carries out dephosphorization.
As preferably, after roughing, carry out dephosphorization before crop and finish rolling successively；
Crop: intermediate blank is delivered to flying shear and carries out crop；
Dephosphorization before finish rolling: enter finish rolling dephosphorizing machine and carry out dephosphorization.
As preferably, cool down after finish rolling: cooled down by laminar cooling system.
As preferably, after curling, hot-rolled coil is unloaded successively volume, checks, the number of spray, pack and enter
Storehouse.
As preferably, the thickness of described steel billet is 150-200mm, and the thickness of described intermediate blank is 30-45mm.
As preferably, the tapping temperature of steel billet is 1250-1300 DEG C, and the start rolling temperature of roughing is
1240-1285 DEG C, roughing extreme trace time temperature is 1175-1195 DEG C, and the start rolling temperature of finish rolling is
1150-1175 DEG C, finish rolling extreme trace time temperature is 920-950 DEG C.
Present invention also offers a kind of hot-rolled coil produced by above-mentioned hot-rolled coil production technology, it is changed
Study and point be by weight percentage: C:0.14-0.22%, Si:0.15-0.3%, Mn:0.3-0.65%,
P :≤0.02%, S :≤0.05%, remaining is Fe.
The invention has the beneficial effects as follows: total rolling pass of present invention process is 10 passages, similar
In hot-rolled coil production technology, the rolling pass of present invention process is domestic minimum, belongs to domestic initiation.
5 passages in the roughing operation of existing hot-rolled coil carried out steel billet are back and forth rolled and is reduced to 3 passages
Reciprocal rolling, reduces steel billet and is processed into the time of intermediate blank, enables the intermediate blank can in the shorter time
Enter subsequent processing, substantially reduce the roughing production cycle, make roughing production capacity and finish rolling, batch, heat
The production capacity of operation matches, and reaches to improve 40-63% during system productivity ratio roughing 5 passage.Meanwhile, by
After roughing, the more existing technique of the temperature of intermediate blank is higher, and when entering finishing rolling step, its temperature is higher,
Under equal pressure, there is more preferable ductility, reduction ratio or the fine setting essence of finishing mill need not be adjusted
The reduction ratio of milling train can produce qualified hot-rolled coil.Due in the operation of rolling, the oxygen of billet surface
Change ferrum can crush and cause red scale, and the passage reducing roughing can also reduce the shape of iron scale
Become, and make intermediate blank enter finishing rolling step at higher temperatures, it is also possible to play minimizing iron scale
The effect formed.Before roughing, steel billet is carried out dephosphorization before roughing, removes the ferrum oxide on its surface, but
Being to ensure that steel billet carries out the temperature of rough rolling step, before roughing, the time of dephosphorization operation can not be oversize, because of
This this operation is limited to the removal effect of ferrum oxide.Therefore by after roughing before finish rolling to centre
Base carries out dephosphorization before finish rolling, removes the ferrum oxide of remnants, owing to intermediate blank is before carrying out finish rolling during dephosphorization,
Temperature is maintained at 1175-1195 DEG C, now, and the former silicon that the ferrum oxide crystal on intermediate blank surface is in a liquid state
Acid is ferrous will be surrounded, and form the eutectoid product of ferrum oxide/ferrous orthosilicate, by dephosphorization energy before finish rolling
Enough it is removed more up hill and dale.
Detailed description of the invention
Principle and feature to the present invention are described below, and example is served only for explaining the present invention, and
Non-for limiting the scope of the present invention.
A kind of hot-rolled coil production technology, including following operation:
(1) heating: the steel billet that thickness is 150-200mm is delivered to heating furnace heating；
(2) dephosphorization before roughing: the steel billet after coming out of the stove is delivered to dephosphorizing machine by roller-way and carried out dephosphorization；
(3) roughing: steel billet enters roughing mill and back and forth rolls 3 passages；
(4) crop: intermediate blank is delivered to flying shear and carries out crop；
(5) dephosphorization before finish rolling: intermediate blank enters finish rolling dephosphorizing machine and carries out dephosphorization；
(6) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product；
(7) cooling: finished product is cooled down by laminar cooling system；
(8) curling: finished product enters coiling machine rolled, obtains hot-rolled coil；；
(9) volume is unloaded；
(10) inspection；
(11) spray number；
(12) packing；
(13) warehouse-in.
A kind of hot-rolled coil using above-mentioned production technology to make, its chemical composition is by weight percentage
For: C:0.14-0.22%, Si:0.15-0.3%, Mn:0.3-0.65%, P :≤0.02%, S :≤
0.05%, remaining is Fe, wherein also have some inevitable impurity, but the performance to hot-rolled coil
Do not result in impact.
Roughing mill full production in existing hot-rolled coil production technology, and finish rolling, batch, Lubricating-oil Station,
The time of the systems, only 40-50% such as Hydraulic Station, dead level station, center pump house, laminar flow pump house is effective work
Making, remaining most of the time is all in idle running.In order to improve production capacity, general thinkable scheme is not change
In the case of becoming the unit quantity of remaining operation, carry out by the way of increasing the number of units of roughing mill, this
Although sample can increase production capacity, but has the disadvantage in that the quantity of 1. increase roughing mills, first it is straight
Connect input cost and the maintenance cost adding machine；2. after roughing mill quantity increases, by energy consumption the most also
Can correspondingly increase；Namely improving of production capacity also sets up the increase at Productive statistics simultaneously, imitates from economy
For in benefit, the lifting obtained is little.
And the roughing operation of the present invention still retains the production line of existing hot-rolled production process, it is increased without
Any equipment, only need to be adjusted to 150-200mm by steel billet thickness, and the work roll diameter of roughing mill strengthens
0-20mm, say, that as long as increasing little Productive statistics, or be increased without Productive statistics, creates
Property ground 5 passages in the roughing operation of existing technique carried out steel billet are back and forth rolled that to be reduced to 3 passages past
Multiple rolling, forms new processing technique, decreases steel billet and be processed into the time of intermediate blank, make intermediate blank energy
Enough can enter subsequent processing in the shorter time, substantially reduce the roughing production cycle, make roughing production capacity
With finish rolling, batch, the production capacity of heating process matches, improve when reaching system productivity ratio roughing 5 passage
40-63%.
Total rolling pass of present invention process is 10 passages, in similar hot-rolled coil production technology,
The rolling pass of present invention process is minimum, belongs to domestic initiation.The production technology of the present invention utilizes can be more
The short production time can produce the higher hot-rolled coil of qualification rate.Due to the temperature of intermediate blank after roughing
More existing technique is higher, and when entering finishing rolling step, its temperature is higher, under equal pressure, has
Preferably ductility, the reduction ratio of the reduction ratio or fine setting finishing mill that need not adjust finishing mill can produce
Go out qualified hot-rolled coil.
It addition, there will be the problem of surface red scale in existing hot-rolled coil produces, red
Iron scale has the characteristic such as higher hardness and difficult pickling removal, is once formed at surface of steel plate, not only
Affect product quality, and the difficulty of control of product quality in subsequent handling can be strengthened.Due to the operation of rolling
In, the ferrum oxide of billet surface can crush and cause red scale, carries out steel billet slightly before roughing
Roll front dephosphorization, remove the ferrum oxide on its surface, however, to ensure that steel billet carries out the temperature of rough rolling step,
Before roughing, the time of dephosphorization operation can not be oversize, and therefore this operation is limited to the removal effect of ferrum oxide.
The production technology of the present invention decreases the passage of roughing can also reduce the formation of iron scale, and
Intermediate blank is made to enter finishing rolling step at higher temperatures, it is also possible to play and reduce the work that iron scale is formed
With.
By intermediate blank being carried out before finish rolling after roughing dephosphorization before finish rolling, remove the oxidation of remnants
Ferrum, owing to intermediate blank is before carrying out finish rolling during dephosphorization, temperature is 1175-1195 DEG C, now, intermediate blank
The ferrum oxide crystal on surface will be surrounded by the ferrous orthosilicate of liquid, form ferrum oxide/ferrous orthosilicate
Eutectoid product, can be removed more up hill and dale by dephosphorization before finish rolling.And the ferrous orthosilicate after solidifying
Forming similar anchor-shaped pattern, lived by iron oxide layer pinning, the ferrum oxide that pinning is lived is difficult in dephosphorization complete
Entirely remove.Remaining ferrum oxide can crush in the hot rolling, adds with the contact area of oxygen in air
Greatly, cause generating red ferrum oxide.Therefore red scale is removed completely, it is necessary in dephosphorization
Remove the iron oxide layer of residual in journey, then inevitable requirement removes ferrous orthosilicate completely.Existing technique to reach
To this requirement, the general mode only using the power increasing heating furnace, improve the tapping temperature of steel billet,
The most also the consumption of the energy will necessarily be increased.
The hot-rolled coil production technology using the present invention carries out hot-rolled coil and creates the biggest economic benefit,
Specifically include:
1. yield is greatly improved.Originally whole piece rolling line is to roll a steel 120-150 second, and new technique is
77-90 rolls one, rolls 40-46 per hour and props up to prop up than original 24-30 and improve 53-66%, can claim
Upper Super-high-yielding production technology.
2. power consumption significantly declines: existing technique is roughing mill full production, and finish rolling, batch, dilute
The time of the systems, only 40-50% such as petrol station, Hydraulic Station, dead level station, center pump house, laminar flow pump house is
Effectively work, remaining most of the time, present invention process improve the rhythm of production of system all in idle running,
The equipment idle period is made to greatly reduce, so power consumption reduces 15-25%, ton steel economize on electricity 10-25 than originally
Degree, expense reduces 6-15 yuan/ton, and as a example by 1450 milling trains, present annual production is 3,000,000 tons, this
Invented technology can reach 4,890,000 tons, and year economize on electricity 4000-112500 ten thousand degree, economic benefit reaches
2400-6750 ten thousand yuan.
3. depreciation cost is greatly reduced, and is 60 yuan per ton now, and yield is to 400-450 ten thousand ton hour, per ton
Steel depreciation cost fall 15-20 unit, year benefit be 6000-9000 ten thousand yuan.
4. comprehensive benefit: improve after yield, various supplementary product onsumptions: such as roll, bearing, hydraulic oil, dilute
Oil, grease, personnel's wage, gas charge have the reduction of 3-8%, power consumption and depreciation cost two total
Reaching 8400-15750 ten thousand yuan, ton steel benefit 21-35 unit, economic benefit is the most objective, in market
In the case of the most cruel, the most precious.
In sum, the present invention feature:
1., on the 800-1580mm hot-rolled coil production line of only 1 frame roughing mill, use roughing reciprocal
Roll 3 passage Technologies, improve yield 40-63%, Super-high-yielding technology can be deserved to be called.
2. economic benefit is big, by reducing power consumption and depreciation cost two, can produce and add up to
The year benefit of 8400-15750 ten thousand yuan.
3. small investment, instant effect: rolling line rough rolling working roll the to be strengthened diameter having changes billet size,
Need to invest 3,000,000 yuan, the time need two months, have without transformation, it is possible to implement new technique.
4. conforming product rate is high, utilizes the shorter production time can produce better quality, and qualification rate is more
High product.
5. effects of energy saving and emission reduction is big.Because generating a kilowatt wants 0.4kg coal, economize on electricity 4000-11250 per year
Ten thousand degree of calculating, can reduce discharge capacity as follows: sulfur dioxide 120-337 ton, nitrogen oxides 6001687 tons,
Carbon dust 10800-30600 ton, carbon dioxide 39960-112387 ton；Visible effects of energy saving and emission reduction is non-
Chang great.
Therefore, the present invention is the technique of a Super-high-yielding, yield is greatly improved and reaches 63%, be greatly lowered into
This, effects of energy saving and emission reduction is big, and comprehensive benefit is good, has the biggest promotion and use value.
Embodiment 1
A kind of hot-rolled coil production technology, including following operation:
(1) heating: the steel billet that thickness is 150mm is delivered to heating furnace heating, is added to required temperature
After come out of the stove, the tapping temperature of steel billet is 1250 DEG C；
(2) dephosphorization before roughing: the steel billet after coming out of the stove is delivered to dephosphorizing machine by roller-way and carried out dephosphorization；
(3) roughing: steel billet enters roughing mill and back and forth rolls 3 passages, becomes the intermediate blank that thickness is 30mm,
Wherein, the roughing start rolling temperature of steel billet is 1240 DEG C, and roughing extreme trace time temperature is 1175 DEG C；
(4) crop: intermediate blank is delivered to flying shear and carries out crop；
(5) dephosphorization before finish rolling: intermediate blank enters finish rolling dephosphorizing machine and carries out dephosphorization；
(6) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product, the essence of intermediate blank
Rolling start rolling temperature is 1150 DEG C, and finish rolling extreme trace time temperature is 920 DEG C；
(7) cooling: finished product is cooled down by laminar cooling system；
(8) curling: finished product enters coiling machine rolled, obtains the hot-rolled coil that thickness is 16mm, should
The chemical composition of hot-rolled coil is by weight percentage: C:0.22%, Si:0.18%, Mn:0.4%,
P:0.02%, S:0.05%, remaining is Fe；
(9) volume is unloaded；
(10) inspection；
(11) spray number；
(12) packing；
(13) warehouse-in.
Embodiment 2
A kind of hot-rolled coil production technology, including following operation:
(1) heating: the steel billet that thickness is 180mm is delivered to heating furnace heating, is added to required temperature
After come out of the stove, the tapping temperature of steel billet is 1270 DEG C；
(2) dephosphorization before roughing: the steel billet after coming out of the stove is delivered to dephosphorizing machine by roller-way and carried out dephosphorization；
(3) roughing: steel billet enters roughing mill and back and forth rolls 3 passages, becomes the intermediate blank that thickness is 37mm,
Wherein, the roughing start rolling temperature of steel billet is 1260 DEG C, and roughing extreme trace time temperature is 1185 DEG C；
(4) crop: intermediate blank is delivered to flying shear and carries out crop；
(5) dephosphorization before finish rolling: intermediate blank enters finish rolling dephosphorizing machine and carries out dephosphorization；
(6) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product, the essence of intermediate blank
Rolling start rolling temperature is 1163 DEG C, and finish rolling extreme trace time temperature is 937 DEG C；
(7) cooling: finished product is cooled down by laminar cooling system；
(8) curling: finished product enters coiling machine rolled, obtains the hot-rolled coil that thickness is 18.5mm,
The chemical composition of this hot-rolled coil is by weight percentage: C:0.19%, Si:0.23%, Mn:0.44%,
P:0.018%, S:0.045%, remaining is Fe；
(9) volume is unloaded；
(10) inspection；
(11) spray number；
(12) packing；
(13) warehouse-in.
Embodiment 3
A kind of hot-rolled coil production technology, including following operation:
(1) heating: the steel billet that thickness is 200mm is delivered to heating furnace heating, is added to required temperature
After come out of the stove, the tapping temperature of steel billet is 1300 DEG C；
(2) dephosphorization before roughing: the steel billet after coming out of the stove is delivered to dephosphorizing machine by roller-way and carried out dephosphorization；
(3) roughing: steel billet enters roughing mill and back and forth rolls 3 passages, becomes the intermediate blank that thickness is 45mm,
Wherein, the roughing start rolling temperature of steel billet is 1285 DEG C, and roughing extreme trace time temperature is 1195 DEG C；
(4) crop: intermediate blank is delivered to flying shear and carries out crop；
(5) dephosphorization before finish rolling: intermediate blank enters finish rolling dephosphorizing machine and carries out dephosphorization；
(6) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product, the essence of intermediate blank
Rolling start rolling temperature is 1175 DEG C, and finish rolling extreme trace time temperature is 950 DEG C；
(7) cooling: finished product is cooled down by laminar cooling system；
(8) curling: finished product enters coiling machine rolled, obtains the hot-rolled coil that thickness is 20mm, should
The chemical composition of hot-rolled coil is by weight percentage: C:0.18%, Si:0.27%, Mn:0.55%,
P:0.019%, S:0.048%, remaining is Fe；
(9) volume is unloaded；
(10) inspection；
(11) spray number；
(12) packing；
(13) warehouse-in.
By inspection, the hot-rolled coil production technology of the present invention is used to produce the mechanics of the hot-rolled coil obtained
Performance is as follows:
| Product type | Thickness (mm) | Tensile strength (MPa) | Yield strength (MPa) | Percentage elongation (%) |
| Technical standard | ≤ 16/ ＞ 16-40 | 375-460 | ≥235/≥225 | ≥26/≥25 |
| Embodiment 1 | 16 | 458 | 252 | 30.4 |
| Embodiment 2 | 18.5 | 455 | 241 | 29.2 |
| Embodiment 3 | 20 | 459 | 235 | 26.5 |
According to above table, the hot-rolled coil production technology of the present invention is used to produce the hot rolling product obtained
The requirement that roll bending meets the technical standards, belongs to qualified product, and its quality is relative to existing hot rolling
Roll bending production technology produces the hot-rolled coil obtained and has higher quality, has higher product qualified
Rate, the conforming product rate that the present invention produces has reached 100%.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (8)
1. a hot-rolled coil production technology, it is characterised in that include following operation:
(1) heating: steel billet is delivered to heating furnace heating, comes out of the stove after being added to required temperature；
(2) roughing: steel billet enters roughing mill and back and forth rolls 3 passages, becomes intermediate blank；
(3) finish rolling: intermediate blank enters finishing mill and rolls 7 passages continuously, becomes finished product；
(4) curling: finished product enters coiling machine rolled, obtains hot-rolled coil.
Hot-rolled coil production technology the most according to claim 1, it is characterised in that roughing it
Before carry out roughing before dephosphorization: the steel billet after coming out of the stove is delivered to dephosphorizing machine by roller-way and is carried out dephosphorization.
Hot-rolled coil production technology the most according to claim 2, it is characterised in that roughing it
After carry out dephosphorization before crop and finish rolling successively；
Crop: intermediate blank is delivered to flying shear and carries out crop；
Dephosphorization before finish rolling: enter finish rolling dephosphorizing machine and carry out dephosphorization.
Hot-rolled coil production technology the most according to claim 3, it is characterised in that finish rolling it
After cool down: cooled down by laminar cooling system.
Hot-rolled coil production technology the most according to claim 4, it is characterised in that after curling
Hot-rolled coil is unloaded successively volume, checks, the number of spray, pack and put in storage.
Hot-rolled coil production technology the most as claimed in any of claims 1 to 5, its feature
Being, the thickness of described steel billet is 150-200mm, and the thickness of described intermediate blank is 30-45mm.
Hot-rolled coil production technology the most according to claim 6, it is characterised in that going out of steel billet
Furnace temperature is 1250-1300 DEG C, and the start rolling temperature of roughing is 1240-1285 DEG C, roughing extreme trace time temperature
For 1175-1195 DEG C, the start rolling temperature of finish rolling is 1150-1175 DEG C, and finish rolling extreme trace time temperature is
920-950℃。
8. the hot rolling that a hot-rolled coil production technology as described in any one of claim 1 to 7 is produced
Roll bending, its chemical composition is by weight percentage: C:0.14-0.22%, Si:0.15-0.3%, Mn:
0.3-0.65%, P :≤0.02%, S :≤0.05%, remaining is Fe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320964.3A CN105834212A (en) | 2016-05-16 | 2016-05-16 | Production technology for hot-rolled coiled plates and hot-rolled coiled plates |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320964.3A CN105834212A (en) | 2016-05-16 | 2016-05-16 | Production technology for hot-rolled coiled plates and hot-rolled coiled plates |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108160740A (en) * | 2017-12-28 | 2018-06-15 | 滁州宝岛特种冷轧带钢有限公司 | A kind of cold-strip steel coiled sheet production technology |
| CN108315641A (en) * | 2018-01-19 | 2018-07-24 | 河钢股份有限公司承德分公司 | A kind of high-strength rim for automobile wheel hot-rolled coil and its production method |
| CN109972036A (en) * | 2019-04-01 | 2019-07-05 | 山东钢铁集团日照有限公司 | A kind of hot rolling Q&P1180 steel and its manufacturing method with different yield tensile ratios |
| CN110665980A (en) * | 2019-09-27 | 2020-01-10 | 江苏恒丰新材料制造有限公司 | Research, development and field application method of ESP hot rolling oil |
| CN112934958A (en) * | 2021-01-28 | 2021-06-11 | 河北纵横集团丰南钢铁有限公司 | Production process of hot-rolled coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108160740A (en) * | 2017-12-28 | 2018-06-15 | 滁州宝岛特种冷轧带钢有限公司 | A kind of cold-strip steel coiled sheet production technology |
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| CN109972036A (en) * | 2019-04-01 | 2019-07-05 | 山东钢铁集团日照有限公司 | A kind of hot rolling Q&P1180 steel and its manufacturing method with different yield tensile ratios |
| CN109972036B (en) * | 2019-04-01 | 2021-09-10 | 山东钢铁集团日照有限公司 | Hot-rolled Q & P1180 steel with different yield ratios and manufacturing method thereof |
| CN110665980A (en) * | 2019-09-27 | 2020-01-10 | 江苏恒丰新材料制造有限公司 | Research, development and field application method of ESP hot rolling oil |
| CN112934958A (en) * | 2021-01-28 | 2021-06-11 | 河北纵横集团丰南钢铁有限公司 | Production process of hot-rolled coil |
| CN112934958B (en) * | 2021-01-28 | 2022-08-23 | 河北纵横集团丰南钢铁有限公司 | Production process of hot-rolled coiled plate |
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