CN108941196A - A method of with 200 big cross section square billet continuous rolling small-sized bars - Google Patents
A method of with 200 big cross section square billet continuous rolling small-sized bars Download PDFInfo
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- CN108941196A CN108941196A CN201810666365.6A CN201810666365A CN108941196A CN 108941196 A CN108941196 A CN 108941196A CN 201810666365 A CN201810666365 A CN 201810666365A CN 108941196 A CN108941196 A CN 108941196A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003801 milling Methods 0.000 claims abstract description 130
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 230000011218 segmentation Effects 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000001343 mnemonic effect Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000009413 insulation Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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Abstract
The present invention discloses a kind of method with 200 big cross section square billet continuous rolling small-sized bars, the heating stepses including 200mm × 200mm big cross section square billet to be heated to 1100 DEG C and soaking heat preservation；200mm × 200mm big cross section square billet after heat preservation is sequentially sent to the 1# roughing milling train of horizontally and vertically alternative arrangement and 2# roughing milling train carries out de- head roughing, obtains the de- head roughing step of 165mm × 162mm square billet；165mm × 162mm square billet is entered into 3# roughing milling train through de- head roller-way, milling train and finish rolling mill milling in roughing milling train and 8~12 passages through 6 passage horizontally and vertically alternatives arrangement obtain the middle finish rolling step of the small dimension bar of 16~Φ of Φ 40mm；Above-mentioned small dimension bar carries out multiple length segmentation using flying shear after the completion of rolling, cooling obtains the shearing cooling step of small dimension finished product bar.The present invention has the characteristics that operating rate is high, rolling is stablized, rolls that damage is low, lumber recovery is higher.
Description
Technical field
The invention belongs to technical field of steel rolling, and in particular to a kind of operating rate is high, rolling is stablized, roll damage low, lumber recovery compared with
The high method with 200 big cross section square billet continuous rolling small-sized bars.
Background technique
Steel material is with its characteristic and higher intensity and toughness, easy processing mouldability, green recyclability
Structural material will be important in future period.Small rod is always the maximum rolling shapes of China's consumption figure, at present
Wire and rod accounts for 50% or so of steel total output, and small rod yield accounts for 25% or so of the total output of steel.With automobile system
It makes, electricapparatus, shipbuilding industrial expansion, plate, tubing ratio shared in steel will be gradually increased, wire and rod institute
Accounting example will be declined, but its absolute value is still rising.
Small-sized bar is rolling by multiple tracks by big cross section square billet, but in the prior art, due to milling train scale, number
The limitation of amount and technology, when big cross section billet rolling small-sized bar, which generally requires two fire rollings, to complete, and not only heat energy
Consumption is higher, and recovery rate of iron is lower.Currently, rolling by one time heatin is the technique of relatively broad use, but conventional bar produces
The blank section of product mainly has 150mm × 150mm, several sections of 165mm × 165mm, 170mm × 170mm, more than 200 sides big
The blank of section rolls conventional scale rod bar and mainly passes through slit rolling process, with roll or other equipment by the blank of big cross section
It is divided into the small section billet of two or more pieces rolling along longitudinal direction, so that lengthening coefficient is reduced to original 1/2,1/3 or 1/4,
Although can reduce lengthening coefficient, reduce billet specification type, that there is also energy consumptions is higher, recovery rate of iron is low, equipment impact
Frequently, the high problem of operating rate is shut down.Due to the limitation of equipment and technique, the at present rolling of 200mm × 200mm big cross section blank
It presently mainly is used to roll the big stick-means of intimidation or product forms of Ф 60mm or more, is rarely used in rolling small dimension product, especially for
The biggish blank rolling small dimension product of 200mm × 200mm × 9m~12m substance does not have substantially.In the prior art 200mm ×
200mm big cross section blank rolls small-sized bar, generally overcomes big cross section blank to the total of small-sized bar using long process
The larger problem of lengthening coefficient, but too long process longer, the rolled piece head and tail temperature difference in the milling train of front and back that will cause rolling time again
It is larger, it is necessary to install insulation cover or reheating mode additional to solve the problems, such as temperature drop, and install insulation cover additional and cause to put into larger, maintenance
Change the outfit difficulty, and reheating will cause the old problem that heating energy consumption is high, recovery rate of iron is low again.In addition, using in the prior art
Long process pass schedule be difficult to share with 150mm × 150mm, 165mm × 165mm and 170mm × 170mm equal section, not only
Pass is complicated, and transitinal pass type is excessive, so that the spare parts type such as high production cost, roll and guide and guards is more, occupancy is big,
Consumption is big, and occupied fund is more, and labor intensity of workers is big, and management and operating difficulties easily cause confusion；And it is changed when replacing kind
Roller amount is big, the time is long, keeps production operational availability low, affects the flexibility of product variety replacement, production and market adaptability are poor, sternly
The high advantage of big cross section continuous rolling production capacity has been fettered again.
Summary of the invention
Insufficient present on to solve, the purpose of the present invention is to provide a kind of operating rates, and high, rolling stablizes, rolls damage
Low, the higher method with 200 big cross section square billet continuous rolling small-sized bars of lumber recovery.
The object of the present invention is achieved like this: including heating, de- head roughing, middle finish rolling, cooling step is sheared, it is specific to walk
It is rapid as follows:
A, it heats: 200mm × 200mm big cross section square billet being heated to 1100 DEG C and soaking is kept the temperature；
B, it takes off head roughing: the 1# roughing that 200mm × 200mm big cross section square billet after heat preservation is sequentially sent to horizontally and vertically alternative arrangement is rolled
Machine and 2# roughing milling train carry out de- head roughing, obtain 165mm × 162mm square billet；
C, middle finish rolling: 165mm × 162mm square billet is entered into 3# roughing milling train through de- head roller-way, through 6 passage horizontally and vertically alternatives arrangement
Milling train and finish rolling mill milling in roughing milling train and 8~12 passages, obtain the small dimension bar of 16~Φ of Φ 40mm；
D, shearing cooling: above-mentioned small dimension bar carries out multiple length segmentation using flying shear after the completion of rolling, cooling obtains small dimension
Finished product bar.
Compared with the prior art, the invention has the following beneficial effects:
1, the present invention passes through 1# and 2# to overcome the problems, such as big cross section billet rolling small-sized bar long flow path in the prior art
Roughing milling train carries out de- head roughing, and the optimization of reasonable distribution and pass that remaining roughing mill and middle finishing mill carry out lengthening coefficient is set
Meter, thus the small dimension for making 200mm × 200mm big cross section square billet only need 16~20 passages that can roll 16~Φ of Φ 40mm
Bar not only simplifies rolling process, reduces rolling pass, also reduces production cost；
2, the present invention is in order to overcome the problems, such as that transitinal pass type is excessive in the prior art, is rolled by 1# roughing milling train and 2# roughing
Machine carries out de- head roughing, to realize the later 200mm × 200mm big cross section square billet of 3# milling train and 150mm × 150mm, 165mm
× 165mm square billet pass schedule shares, and has both reduced the spare parts type such as roll and guide and guards, and it is different big disconnected to also avoid rolling
The frequent replacement of design of section of rolling mill when the square billet of face, improve production operation effect and；
3, since 1# and 2# takes off head rolling when the present invention is for rolling 200mm × 200mm square billet, blank section is big, and rolled piece is longer,
Rolling time is longer, and the head and tail temperature difference into subsequent milling train group rolled piece is larger, needs Insulation or reheating in the prior art
The problem of, the present invention is by control conveying ground roll and the speed of 1# and 2# roughing milling train, it is ensured that square billet enters 3# milling train
Start rolling temperature, and each milling train close-packed arrays that 1# and 2# roughing milling train is later, off time are short, rolled piece temperature drop is small, so as to
It realizes heating once and rolling, reduce heating energy consumption and improves recovery rate of iron；
4, all fronts milling train of the present invention arranges that the continuous no twist rolling, it can be achieved that bar, every rolling mill can be passed individually in horizontally and vertically alternative
Dynamic or group drive, every frame only roll together, and mill speed is fast, and yield is high；Length of rolled piece is not by machine when due to continuous no twist rolling
Frame spacing limitation, therefore under the premise of guaranteeing that the rolled piece head and the tail temperature difference is no more than permissible value, the present invention can be used for 150 × 150 ×
A variety of big cross sections such as 12000mm, 165 × 165 × 12000mm, 200 × 200 × 12000mm, 230 × 230 × 9000mm, big weight
The bar of billet rolling different size is measured, so as to improve rolling mill yield and recovery rate of iron；
5, for the slit rolling process of the invention in the case where yield guarantees, being widely used compared to the prior art, rolling
The item number that 200mm × 200mm big cross section square billet rolls per hour reduces, thus the impact time caused by milling train and its auxiliary device
Number greatly reduces, therefore rolls mechanical accident during 200 sides, electrical hazard and rolling accident and preferably controlled, and shuts down operation
Rate reduces, and index gets a promotion.
Therefore, the present invention has the characteristics that operating rate is high, rolling is stablized, rolls that damage is low, lumber recovery is higher.
Specific embodiment
The present invention is further illustrated below, but the present invention is limited in any way, based on the present invention
It is any made by introduction to transform or replace, it all belongs to the scope of protection of the present invention.
The present invention includes heating, de- head roughing, middle finish rolling, shearing cooling step, the specific steps are as follows:
A, it heats: 200mm × 200mm big cross section square billet being heated to 1100 DEG C and soaking is kept the temperature；
B, it takes off head roughing: the 1# roughing that 200mm × 200mm big cross section square billet after heat preservation is sequentially sent to horizontally and vertically alternative arrangement is rolled
Machine and 2# roughing milling train carry out de- head roughing, obtain 165mm × 162mm square billet；
C, middle finish rolling: 165mm × 162mm square billet is entered into 3# roughing milling train through de- head roller-way, through 6 passage horizontally and vertically alternatives arrangement
Milling train and finish rolling mill milling in roughing milling train and 8~12 passages, obtain the small dimension bar of 16~Φ of Φ 40mm；
D, shearing cooling: above-mentioned small dimension bar carries out multiple length segmentation using flying shear after the completion of rolling, cooling obtains small dimension
Finished product bar.
Control conveying ground roll and 1# roughing milling train and 2# are thick after 200mm × 200mm big cross section square billet is come out of the stove in the step B
Milling train accelerates rolling, the control conveying ground roll after 165mm × 162mm square billet head after de- head roughing enters 3# roughing milling train
And 1# roughing milling train and 2# roughing milling train are decelerated to normal mill speed, make square billet temperature into 3# roughing milling train 950 ±
10℃。
The 1# roughing milling train and the normal mill speed of 2# roughing milling train are respectively 0.31m/s, 0.37m/s.
The pass of 1# roughing milling train is the flat box of height 150mm, rolled piece width 215mm in the step B, and the 2# is thick
The pass of milling train is the vertical box of height 165mm, rolled piece width 165mm, and the 1# roughing milling train and/or 2# roughing milling train are
750 milling train of Φ.
It include the roughing milling train of 3#~8# horizontally and vertically alternative arrangement, the pass of 3#~8# roughing milling train in the step C
Variation sequence is successively are as follows: flat case pass → vertical case pass → oval groove → circular hole → oval groove → circular hole.
The pass of the 3# roughing milling train is the flat box of height 120mm, rolled piece width 180mm, the 4# roughing milling train
Pass be height 136mm, rolled piece width 137mm vertical box, the pass of the 5# roughing milling train is height 100mm, rolled piece
The ellipse of width 162mm, the pass of the 6# roughing milling train are round, the 7# of height 110mm, rolled piece width 110mm
The pass of roughing milling train is the ellipse of height 75mm, rolled piece width 126mm, and the pass of the 8# roughing milling train is height
The ellipse of 86mm, rolled piece width 86mm.
3# roughing milling train and/or 4# roughing milling train in the step C are 650 milling train of 750 milling train of Φ or Φ, the 5#~
8# roughing milling train is 650 milling train of Φ, in the step C in milling train be 475 milling train of 500 milling train of Φ and/or Φ, the finish rolling
Milling train is 350 milling train of Φ 420 and/or Φ.
The roughing milling train, in milling train and finish rolling milling train be short stress rolling mill, 1 ~ 11# milling train is electric current mnemonics
Milling train and finish rolling milling train are vertical tower-loop control tension free rolling in micro tension milling and residue.
By milling train and finish rolling mill milling in 8~10 passages in the step C, the small of 16~Φ of Φ 25mm is obtained
Specification bar；By milling train in 10~12 passages and finish rolling mill milling, the small dimension bar of 26~Φ of Φ 40mm is obtained.
200mm × 200mm big cross section square billet goes out beam bottom step into side by full beam walking beam furnace, side in the step A
Into formula heating furnace, holds and go out that pusher-type furnace, single loading side goes out heating furnace into side or three-stage continuously pushes away steel heater into side
It heats and soaking is kept the temperature.
Embodiment 1
By taking 200 × 200 × 12000mm big cross section billet rolling Ф 25mm bar as an example, the specific steps are as follows:
1, end of the 200mm × 200mm × 12000mm big cross section square billet through cold base heating efficiency 180t/h goes out steel-pushing type heating into side
Stove heating is to 1100 DEG C and soaking is kept the temperature；
1.1, intensity of hearth is checked
By intensity of hearth calculation formula: P=G/S(wherein: P: intensity of hearth [kg/ (m2.h)]；G: furnace output, kg/h；S: furnace
Sub- effective area m2), stove intensity of hearth meets rolling 200mm × 200mm × 12000mm when rolling 200 side.
1.2, water beam strength is checked
Wyq < Wsj(is wherein: Wsj is the section factor of water beam), meet technique requirement by checking intensity,
Amount of deflection fmax < 0.002, meets the requirements.
1.3, heating time checks
230 billet heating times: τ=KS/(1.24-S are rolled according to adding this black formula of F. to calculate),
In formula: τ-heating time h, K-coefficient take K=13.9, S-steel billet thickness (m),
It is calculated: heating time τ=2.6(h),
200 blanks practical heating time: t=145/40=3.6 (h) is rolled,
τ=2.6 (h) < 3.6 (h) meets by checking 200 square billet heating times of rolling.
1.4, rolling pass determines
The determination of rolling pass carries out passage calculating according to rolling Ф 25mm finished product,
The mm=40000 of mm × 200 of blank area F0=200 mm2,
Ф 25mm finished product cross-sectional area Fn=490.9 mm2,
0=F0/Fn=40000/490.9=81.48 total coefficient of elongation μ,
Mean coefficient of elongation (takes n=1.279 μ),
81.48/ ㏑ 1.279=17.88 of rolling pass n=㏑, takes n=18.
2, the short stress roughing milling train horizontally and vertically alternative arrangement of the 1# and 2# of Φ 750, goes out in 200mm × 200mm big cross section square billet
After furnace, control conveying ground roll and 1# and 2# roughing milling train (rolling parameter such as table 1) accelerate de- head roughing respectively, after de- head roughing
165mm × 162mm square billet head enter 3# roughing milling train after, control conveying ground roll and 1# roughing milling train and 2# roughing milling train subtract
The normal mill speed of speed to respectively 0.31m/s, 0.37m/s take off head roughing, and the square billet temperature into 3# roughing milling train is made to exist
950 ± 10 DEG C, obtain 165mm × 162mm square billet.
3,165mm × 162mm square billet is entered into 3# roughing milling train through de- head roller-way, successively through 6 passage pass variation sequences
Are as follows: short the answering of flat case pass → vertical case pass → oval groove → circular hole → oval groove → circular hole horizontally and vertically alternative arrangement
Power roughing milling train (milling train specification are as follows: 750 × 2+ of Φ Φ 650 × 4, rolling parameter such as table 1), then in the short stress through 10 passages
Finish rolling mill milling (milling train specification are as follows: 475 × 6+ of Φ Φ 350 × 4), obtains the small dimension bar of Φ 25mm, bar is in finished product
It is 980 DEG C that rack, which takes off tail temperature,.
4, above-mentioned small dimension bar carries out multiple length segmentation using flying shear after the completion of rolling, the cooling cut lengths that obtains is 6
The small dimension finished product bar of~12m.
1 rolling schedule of table
5, volume analysis when rate of becoming a useful person and roll mill:
Batch 9874.090 tons of 200 square billet of rolling is concentrated according to above-mentioned process layout, rolling specs are Φ 25mm.
2 rolled metal of table is become a useful person rate
From the point of view of upper table 2 rolls 200 side's lumber recoverys statistics: theoretical lumber recovery index is 100.25%, compared with becoming a useful person for 165/150 side
99.98% index of rate improves 0.27%, this is mainly that 200 sides of rolling are operating rate of rolling mill height, and rolling is stablized, scissor machine is sheared end to end
Number reduce, roll damage it is lower, lumber recovery index is higher.Therefore blank section is bigger more has side to workshop lumber recovery norm controlling
It helps.Yield is 162.27 ton/hours more higher than 165/150 (yield is when 165 side's roll mill when 200 side's roll mill simultaneously
154.69 ton/hours, yield is 153.84 ton/hours when 150 side's roll mill).
6, energy consumption comparison:
3 energy consumption comparison table of table
As can be seen from Table 3: the blast furnace gas and power consumption of 200 sides of rolling is increased than 150/165 side.This is mainly the base of 200 sides
Expect that section is larger compared with 150/165 side, heating time and energy consumption want higher, and wherein power consumption is higher mainly increases by 2 milling trains, energy consumption
It is higher compared with 150/165.
Calculate after the lumber recovery index of consolidated statement 2 and find out: rolling 200 sides ton steel expense reduces by 18.96 compared with 150/165 side
Yuan/ton.
Claims (10)
1. a kind of method with 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that including heating, de- head it is thick
It rolls, middle finish rolling, shearing cooling step, the specific steps are as follows:
A, it heats: 200mm × 200mm big cross section square billet being heated to 1100 DEG C and soaking is kept the temperature；
B, it takes off head roughing: the 1# roughing that 200mm × 200mm big cross section square billet after heat preservation is sequentially sent to horizontally and vertically alternative arrangement is rolled
Machine and 2# roughing milling train carry out de- head roughing, obtain 165mm × 162mm square billet；
C, middle finish rolling: 165mm × 162mm square billet is entered into 3# roughing milling train through de- head roller-way, through 6 passage horizontally and vertically alternatives arrangement
Milling train and finish rolling mill milling in roughing milling train and 8~12 passages, obtain the small dimension bar of 16~Φ of Φ 40mm；
D, shearing cooling: above-mentioned small dimension bar carries out multiple length segmentation using flying shear after the completion of rolling, cooling obtains small dimension
Finished product bar.
2. according to claim 1 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
Control conveying ground roll and 1# roughing milling train and the acceleration of 2# roughing milling train are rolled after 200mm × 200mm big cross section square billet is come out of the stove in step B
System, control conveying ground roll and 1# roughing milling train after 165mm × 162mm square billet head after de- head roughing enters 3# roughing milling train
It is decelerated to normal mill speed with 2# roughing milling train, makes the square billet temperature into 3# roughing milling train at 950 ± 10 DEG C.
3. according to claim 2 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
1# roughing milling train and the normal mill speed of 2# roughing milling train are respectively 0.31m/s, 0.37m/s.
4. according to claim 3 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
The pass of 1# roughing milling train is the flat box of height 150mm, rolled piece width 215mm, the pass of the 2# roughing milling train in step B
For the vertical box of height 165mm, rolled piece width 165mm, the 1# roughing milling train and/or 2# roughing milling train are 750 milling train of Φ.
5. in the method for 200 big cross section square billet continuous rolling small-sized bars according to claim 2,3 or 4, feature exists
The pass variation of roughing milling train including 3#~8# horizontally and vertically alternative arrangement in the step C, 3#~8# roughing milling train is suitable
Sequence is successively are as follows: flat case pass → vertical case pass → oval groove → circular hole → oval groove → circular hole.
6. according to claim 5 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
The pass of 3# roughing milling train is the flat box of height 120mm, rolled piece width 180mm, and the pass of the 4# roughing milling train is height
The vertical box of 136mm, rolled piece width 137mm, the pass of the 5# roughing milling train is height 100mm, rolled piece width 162mm it is ellipse
Round, the pass of the 6# roughing milling train is round, the pass of the 7# roughing milling train of height 110mm, rolled piece width 110mm
For the ellipse of height 75mm, rolled piece width 126mm, the pass of the 8# roughing milling train is height 86mm, rolled piece width 86mm
Ellipse.
7. according to claim 5 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
3# roughing milling train and/or 4# roughing milling train in step C are 650 milling train of 750 milling train of Φ or Φ, and 5#~8# roughing milling train is
650 milling train of Φ, in the step C in milling train be 475 milling train of 500 milling train of Φ and/or Φ, the finish rolling milling train is Φ 420
And/or 350 milling train of Φ.
8. according to claim 7 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
Roughing milling train, in milling train and finish rolling milling train be short stress rolling mill, 1 ~ 11# milling train be electric current mnemonics micro tension milling and
Milling train and finish rolling milling train are vertical tower-loop control tension free rolling in residue.
9. according to claim 5 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that described
By milling train and finish rolling mill milling in 8~10 passages in step C, the small dimension bar of 16~Φ of Φ 25mm is obtained；Through
Milling train and finish rolling mill milling in 10~12 passages are crossed, the small dimension bar of 26~Φ of Φ 40mm is obtained.
10. according to claim 5 in the method for 200 big cross section square billet continuous rolling small-sized bars, it is characterised in that institute
State in step A 200mm × 200mm big cross section square billet by full beam walking beam furnace, side into side go out beam bottom walking beam furnace,
Hold into side go out pusher-type furnace, single loading side into side go out heating furnace or three-stage continuously push away steel heater heating and soaking protect
Temperature.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111644461A (en) * | 2020-05-25 | 2020-09-11 | 山东莱钢永锋钢铁有限公司 | Rolling method of rolling equipment |
| CN112296085A (en) * | 2020-08-14 | 2021-02-02 | 陕钢集团汉中钢铁有限责任公司 | Rough rolling type system for rolling 165 square billets |
| CN113477705A (en) * | 2021-07-08 | 2021-10-08 | 承德建龙特殊钢有限公司 | Rolling device for replacing blanks with different specifications and rolling method thereof |
| CN113926860A (en) * | 2021-09-26 | 2022-01-14 | 南京钢铁股份有限公司 | Method for roughly rolling bar by using large-section rectangular blank |
| CN115365292A (en) * | 2022-09-20 | 2022-11-22 | 宝武集团鄂城钢铁有限公司 | A kind of rolling method of 150mm*150mm square steel |
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| CN104148382A (en) * | 2014-07-21 | 2014-11-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for manufacturing titanium and titanium alloy bars by means of hot continuous rolling |
| CN105170646A (en) * | 2015-10-26 | 2015-12-23 | 中冶赛迪工程技术股份有限公司 | Economical bar sizing production line and method |
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