CN104593698B - Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates - Google Patents
Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates Download PDFInfo
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Abstract
The invention relates to the technical field of cold-rolled weather resistant steel and provides a method for manufacturing high-strength cold-rolled weather resisting steel plates and the high-strength cold-rolled weather resisting steel plates. The technical problem that large-scale stable production of the high-strength cold-rolled weather resisting steel plates is difficultly realized by the conventional continuous annealing production line equipment in the prior art is solved. The method comprises the following steps: heating a continuous casting sheet billet, performing roughing scale removal, fixing the width of a press, performing rough rolling, performing flying shear, performing refined scale removal, performing finish rolling, performing laminar cooling, coiling, pickling, performing cold rolling, performing continuous annealing and flattening, and controlling the following process parameters: (1) the plate tapping temperature is 1260-1290 DEG C; (2) the final rolling temperature of finish rolling is 875-895 DEG C; (3) the coiling temperature is 610-630 DEG C; and (4) the continuous annealing temperature is 800-820 DEG C, and the rapid cooling rate is 30-45 DEG C per second. The technical effect that large-scale stable production of the high-strength cold-rolled weather resisting steel plates can be realized by adopting the conventional continuous annealing equipment is achieved.
Description
Technical field
The present invention relates to the technical field of cold rolling weather resisting steel, disclose a kind of high-strength cold rolling weather-resistant steel plate manufacture method and
High-strength cold rolling weather-resistant steel plate.
Background technology
With the compartment of the fast development of China's container industry and automobile industry, special container panel and repacking vehicle
Base plate steel progressively develops to " Thin Specs, high intensity and high-weatherability " direction, but because of traditional hot continuous rolling production line, by Thin Specs
The restriction of rolling power and Strip Shape Control level, it is impossible to stably produce thickness specification 1.4mm and following, yield strength >=
800MPa and tensile strength >=1100MPa, and the high-strength weathering steel plate with favorable forming property.For this purpose, using cold rolling and move back
Fiery producing line production has become inexorable trend.
Bell-type annealing technique productions are included in prior art and continuous annealing process is produced, wherein, the life of bell-type annealing technique
Product is very sensitive to annealing temperature and time, and cold and hot temperature difference of coil of strip is big, it is difficult to ensures the concordance of logical volume mechanical property and realizes
Stable mass production.And then there is cost of alloy height, annealing temperature height, cooldown rate height etc. and ask in continuous annealing process production
Topic, conventional continuous annealing producing line capacity of equipment are difficult to the batch steady production of high-strength cold rolling weather-resistant steel plate.
The content of the invention
The embodiment of the present invention provides a kind of manufacture method and high-strength cold rolling weather-resistant steel plate of high-strength cold rolling weather-resistant steel plate, to solve
Certainly in prior art, conventional continuous annealing equipment can not realize the technical problem of the batch steady production of economical cold rolling high-strength weathering steel.
In a first aspect, the embodiment of the present invention provides a kind of manufacture method of high-strength cold rolling weather-resistant steel plate, including following technique
Flow process：Continuous casting steel billet heating → thick de-scaling → fixed-width pressure machine → roughing → flying shear → essence de-scaling → finish rolling → section cooling → volume
Take → pickling → cold rolling → continuous annealing → smooth, following technological parameter is controlled：
(1) in continuous casting steel billet heating technique, slab tapping temperature is 1260 DEG C~1290 DEG C；
(2) in the finish-rolling process, finish rolling finishing temperature is 875 DEG C~895 DEG C；
(3) in the coiling technique, coiling temperature is 610 DEG C~630 DEG C；
(4) in the continuous annealing process, 800 DEG C~820 DEG C of continuous annealing temperature, quick cooldown rate 30~45
℃/s。
Optionally, the chemical composition (wt%) of the high-strength cold rolling weather-resistant steel plate is：Carbon：0.165%~0.185%；Silicon：
0.06%~0.14%；Manganese：1.63%~1.73%；Phosphorus：＜ 0.020%；Sulfur：＜ 0.002%；Chromium：0.45%~0.55%；
Nickel：0.08%~0.18%；Copper：0.255%~0.295%；Niobium：0.025%~0.035%；Titanium：0.018%~
0.028%；Boron：0.0015%-0.0025%, remaining is ferrum and inevitable impurity.
Optionally, the yield strength Rel >=800MPa of the high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa,
Elongation percentage El >=7%；And horizontal d=a clod washes during 180 ° of the high-strength cold rolling weather-resistant steel plate are qualified.
Second aspect, the embodiment of the present invention provide a kind of high-strength cold rolling weather-resistant steel plate, the high-strength cold rolling weather-resistant steel plate by
The manufacture method of the high-strength cold rolling weather-resistant steel plate introduced by any embodiment of the present invention is fabricated by.
Optionally, the chemical composition (wt%) of the high-strength cold rolling weather-resistant steel plate is：Carbon：0.165%~0.185%；Silicon：
0.06%~0.14%；Manganese：1.63%~1.73%；Phosphorus：＜ 0.020%；Sulfur：＜ 0.002%；Chromium：0.45%~0.55%；
Nickel：0.08%~0.18%；Copper：0.255%~0.295%；Niobium：0.025%~0.035%；Titanium：0.018%~
0.028%；Boron：0.0015%-0.0025%, remaining is ferrum and inevitable impurity.
Optionally, the yield strength Rel >=800MPa of the high-strength cold rolling weather-resistant steel plate, tensile strength Rm >=1100MPa,
Elongation percentage El >=7%；And horizontal d=a clod washes during 180 ° of the high-strength cold rolling weather-resistant steel plate are qualified.
The present invention has the beneficial effect that：
Due in embodiments of the present invention, in the manufacture process of high-strength cold rolling weather-resistant steel plate, employing by heating furnace
High-temperature heating, high-temperature final rolling and high temperature coiling technique, wherein, 1260 DEG C~1290 DEG C of heating-up temperature, 875 DEG C of finish rolling finishing temperature
~895 DEG C, 610 DEG C~630 DEG C of coiling temperature, 800 DEG C~820 DEG C of continuous annealing temperature, 30~45 DEG C/s of quick cooldown rate.
Course of hot rolling adopts high-temperature technology, roll-force is less, less demanding to equipment of hot rolling, it is ensured that hot rolling process is stablized
Property；Cold-rolled process is capable of achieving high-strength cold rolling weather-resistant steel plate using conventional continuous annealing equipment using the heating of middle temperature and middling speed cooling
Batch steady production.
Description of the drawings
Fig. 1 is the flow chart of the manufacture method of high-strength cold rolling weather-resistant steel plate in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of manufacture method and high-strength cold rolling weather-resistant steel plate of high-strength cold rolling weather-resistant steel plate, to solve
Certainly in prior art, conventional continuous annealing equipment can not realize the technical problem of the batch steady production of economical cold rolling high-strength weathering steel.
Technical scheme in the embodiment of the present application is to solve above-mentioned technical problem, and general thought is as follows：
In the manufacture process of high-strength cold rolling weather-resistant steel plate, employ by heating furnace high-temperature heating, high-temperature final rolling and height
Warm rolling taking technique, wherein, 1260 DEG C~1290 DEG C of heating-up temperature, 875 DEG C~895 DEG C of finish rolling finishing temperature, 610 DEG C of coiling temperature
~630 DEG C, 800 DEG C~820 DEG C of continuous annealing temperature, 30~45 DEG C/s of quick cooldown rate.Course of hot rolling adopts high-temperature technology,
Roll-force is less, less demanding to equipment of hot rolling, it is ensured that the stability of hot rolling process；Cold-rolled process is heated using middle temperature
Cool down with middling speed, the batch steady production of high-strength cold rolling weather-resistant steel plate is capable of achieving using conventional continuous annealing equipment.
In order to be better understood from above-mentioned technical proposal, below by accompanying drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Describe bright, rather than the restriction to technical solution of the present invention in detail, in the case where not conflicting, in the embodiment of the present invention and embodiment
Technical characteristic can be mutually combined.
In a first aspect, the embodiment of the present invention provides a kind of manufacture method of high-strength cold rolling weather-resistant steel plate, Fig. 1 is refer to, wrapped
Include：
Step S101：Continuous casting steel billet heating technique, specially：Slab loading heating furnace is heated, slab goes out furnace temperature
Spend for 1260 DEG C~1290 DEG C；
Step S102：Thick descaling process；
Wherein, the technical process of slab scale on surface is removed before de-scaling refers to roll.In order to avoid bloom or
Continuous casting rolls the iron scale press-in metal on billet surface and produces defect, and de-scaling must be carried out before slab rough rolling.Iron scale
Removing must carry out when iron sheet is not yet pressed into surface before the rolling.Slab before into roughing mills, first by means of cloth
Put the big edger roll before roughing mills and give certain laterally depressing amount, crush the iron scale in steel slab surface, then use high pressure
Water under high pressure before and after water De-scaling box and roughing mill removes iron scale.The pressure of water under high pressure is 120MPa to straight carbon steel, and to steel alloy
170MPa, or even the up to 200MPa having are needed then.
Step S103：Fixed width process is carried out by fixed-width pressure machine；
Wherein, the effect of fixed-width pressure machine is the width for changing steel band, and this is primarily due to slab caster and changes slab
Width it is more complicated, and the fixed width operation for passing through fixed-width pressure machine can meet the need of hot strip steel description different in width
Will.
Step S104：Roughing technique；
Step S105：Flying shear technique；
Wherein, flying shear is arranged on rolling operation line and is used for the head of lateral shear strip steel, tail or to be cut into scale long
Rolled piece, during workpiece motion s, is cut off by degree by cutting edge relative motion.
Step S106：Smart descaling process；
Step S107：Finish-rolling process, wherein, finish rolling finishing temperature is 875 DEG C~895 DEG C；
Step S108：Laminar flow cooling technology；
Wherein, the central role of section cooling be by control section cooling spray water valve open mode, opening or
Person's flow, strip steel is cooled to from a certain finishing temperature (namely above 875 DEG C~895 DEG C) and predetermined batches target temperature
Degree；
Step S109：Coiling technique, wherein, coiling temperature is 610 DEG C~630 DEG C, and the purpose batched is by band coil of strip
Into tubular；
Step S110：Acid cleaning process；
Wherein, the purpose of pickling is that the oxide skin and corrosion thing on steel surface is removed using acid solution.
Step S111：Cold-rolling process；
Wherein, cold rolling to refer to coils of hot-rolled steel be raw material, cold continuous rolling is carried out Jing after pickling scale removal, and its finished product is
Hard volume is rolled, the intensity of hard volume, hardness rise, tough modeling index declines as the cold work hardening that continuous cold deformation causes makes to roll, because
This punching performance will deteriorate, and be only used for the part of simple deformation.
Step S112：Continuous annealing process, in continuous annealing process, 800 DEG C~820 DEG C of continuous annealing temperature, quickly
30~45 DEG C/s of cooldown rate；
Wherein, annealing is a kind of metal heating processing technology, refers to for metal to be heated slowly to uniform temperature, keeps enough
Time, then cooled down with Reasonable Speed.Purpose is to reduce hardness, improves machinability；Elimination residual stress, stable dimensions,
Reduce deformation and crackle tendency；Crystal grain thinning, adjustment tissue, eliminates tissue defects.
And continuous annealing continues through annealing furnace for strip steel, annealing furnace is directly carried out without stop without sealing, strip steel
The mode of production batched.In production application, continuous annealing is widely used, and continuous annealing makes deformed grains be re-converted to uniformly
Equi-axed crystal, while eliminating processing hardening and remaining internal stress, the tissue and performance recovery of steel is at the warm of state before cold deformation
Science and engineering skill.
When the temperature of annealing is 800 DEG C~820 DEG C, in the manufacture process employing of high-strength cold rolling weather-resistant steel plate
Quickly cooling but, ensure that it is cold rolling after strip shape quality and mechanical property, and extend continuous annealing producing line production Technological adaptability.
In the cooldown rate of annealing it is：30~45 DEG C/s, the manufacture process of high-strength cold rolling weather-resistant steel plate is adopted
Middle temperature continuous annealing, equally ensure that it is cold rolling after strip shape quality and mechanical property, and extend continuous annealing producing line production technique fit
Ying Xing.
That is by such scheme, can reach the strip shape quality that ensures in high-strength cold rolling weather-resistant steel plate production process and
The technique effect of mechanical property.
Meanwhile, the continuous annealing process cooled down using middle temperature continuous annealing and middling speed, without the need for high-temperature heating ability and high hydrogen rapid cooling or water
Quench function, with stronger apparatus adaptability, common continuous annealing unit can meet the needs of batch steady production.
Step S113：Flattening process, is obtained with high-strength cold rolling weather-resistant steel plate through flattening process.
Wherein, the strip steel after recrystallization annealing generally requires smooth, makes strip steel obtain necessary performance and surface matter
Amount, the requirement of working procedure processing after satisfaction.So carrying out smooth process, smooth essence is a kind of rolling deformation of light reduction.
Wherein, above step S101~step S109 is course of hot rolling, and above step S110~step S113 is cold-rolled
Journey.
Used as further preferred embodiment, the chemical composition (wt%) of high-strength cold rolling weather-resistant steel plate is：Carbon：0.165%
~0.185%；Silicon：0.06%~0.14%；Manganese：1.63%~1.73%；Phosphorus：＜ 0.020%；Sulfur：＜ 0.002%；Chromium：
0.45%~0.55%；Nickel：0.08%~0.18%；Copper：0.255%~0.295%；Niobium：0.025%~0.035%；Titanium：
0.018%~0.028%；Boron：0.0015%-0.0025%, remaining is ferrum and inevitable impurity.
The alloying element added by the high-strength cold rolling weather-resistant steel plate introduced by the embodiment of the present invention is by more than into being grouped into base
In following principle：
C element is to improve one of most economical effective element of mechanical property, and the C element being solid-solution in steel can both improve steel
Intensity, is also beneficial to combine to form niobium carbide titanium with Nb, Ti element, plays the effect of fine grain and precipitation strength.In the present invention, C is first
Cellulose content is set in 0.165%~0.185%, on the one hand avoids too high its welding performance of deterioration of carbon content, on the other hand can keep away
Peritectoid area is opened, improves Nb bearing steel Surface Quality of Steel Billet.
Si elements can improve steel strength by solution strengthening, but silicone content is higher can increase iron sheet viscosity, increase pickling
Difficulty is removed, is the surface quality for improving cold-rolled steel sheet, silicone content is set as 0.06%~0.14% in the present invention.
Mn elements can significantly improve the toughness and tenacity of steel, but the too high center segregation that can deteriorate steel, Mn in the present invention
Content design is moderate, is 1.63%~1.73%.
P element easily causes the center segregation of steel, deteriorates the welding performance and low-temperature flexibility of steel, P content in the present invention
It is set as ＜ 0.020%.
S elements easily form MnS with Mn elements and are mingled with, and form spot corrosion source, deteriorate the weather resistance of steel in steel, this
Bright middle S contents are set as ＜ 0.002%.
Cu elements can significantly improve the weather resistance of steel when being more than 0.25%, continue to increase weatherability change not substantially,
But cost will be obviously improved and can increase " copper brittleness " risk, and in the present invention, Cu contents are designed as 0.255%~0.295%.
Cr elements can significantly improve the intensity and weather resistance of steel, but the too high plasticity and toughness that can reduce steel, consider Cr
Content is designed as 0.45%~0.55%.
When Ni constituent contents are relatively low, very little contributed to weather resistance, but when Ni/Cu is controlled more than 1/3, substantially can be pressed down
The generation of system " copper brittleness " defect, therefore, in the present invention, Ni contents are designed as 0.08%~0.18%.
Nb elements are typical micro alloying element, by forming tiny niobium carbide precipitate, and can improve austenite
Recrystallization temperature, expands Unhydrated cement rolling, plays its refined crystalline strengthening and precipitation strength effect.When its content it is low, its
Fine grain and precipitation DeGrain；When content is higher, hot rolling deformation drag and rolling difficulty can be dramatically increased.For this purpose, of the invention
Middle Nb contents are designed as 0.025%~0.035%.
Ti is strong carbonitride-forming elements, and it is thick that a small amount of addition can play austenite crystal in suppressing slab heating process
The effect of change, not only dramatically increases hot-rolling draught pressure when addition is excessive, and in the continuous annealing process of cold rolling rear higher temperature
In again there is precipitate and significantly grow up, it is impossible to play precipitating reinforcing effect.For this purpose, Ti constituent contents are designed as in the present invention
0.018%~0.028%.
B is the most economical effective element for improving hardenability of steel, and appropriate addition can obtain low temperature under not high cooling rate
Transformation tissue, in the present invention, B content is designed as 0.0015%-0.0025%.
Also, as, in such scheme, high-strength cold rolling weather-resistant steel plate adopts high C, micro- Nb, micro- Ti and the composition design containing B,
The beneficial invigoration effect of cheap carbon and boron element is given full play to, cost of alloy is significantly reduced.
As further preferred embodiment, the yield strength Rel >=800MPa of high-strength cold rolling weather-resistant steel plate, tensile strength
Rm >=1100MPa, elongation percentage El >=7%；And horizontal d=a clod washes during 180 ° of high-strength cold rolling weather-resistant steel plate are qualified.
Two groups of experimental datas (respectively embodiment 1 and embodiment 2) are explained below to verify according to the embodiment of the present invention
High-strength cold rolling weather-resistant steel plate manufactured by the manufacture method of the high-strength cold rolling weather-resistant steel plate introduced meets requirements above.
The chemical composition (Wt.%) of two groups of experimental datas is as shown in table 1：
Table 1
Hot-rolled process parameter is as shown in table 2：
Table 2
Continuous annealing process parameter is as shown in table 3：
Table 3
Mechanical property is as shown in table 4：
Table 4
Wherein, b represents the width of sampling steel bar, and d is represented sampling steel plate bending to steel bar Bend diameter of sampling when 180 °,
A represents the thickness of sampling steel bar.
Wherein, 1 yield strength of embodiment is 923MPa, more than 800MPa, is met the requirements；Tensile strength Rm is 1156MPa,
Meet the requirements；Elongation percentage El is 9.5, more than 7%, is met the requirements；And during 180 ° of clod washes, d=a, so high-strength cold rolling weathering steel
Transverse cold bending during 180 ° of plate is qualified；And in embodiment 2, yield strength is 878MPa, more than 800MPa, meet the requirements；Tension
Intensity Rm is 1129MPa, is met the requirements；Elongation percentage El is 11.0, more than 7%, is met the requirements；And during 180 ° of clod washes, d=a, therefore
And transverse cold bending during 180 ° of high-strength cold rolling weather-resistant steel plate is qualified.
As can be seen here, it is high-strength cold manufactured by the manufacture method of the high-strength cold rolling weather-resistant steel plate introduced by the embodiment of the present invention
Roll weather-resistant steel plate and there is good mechanical property.
On the other hand, the embodiment of the present invention provides a kind of high-strength cold rolling weather-resistant steel plate, it is characterised in that high-strength cold rolling is weather-proof
The manufacture method of the high-strength cold rolling weather-resistant steel plate that steel plate is introduced by any embodiment of the present invention is fabricated by.
Used as further preferred embodiment, the chemical composition (wt%) of high-strength cold rolling weather-resistant steel plate is：Carbon：0.165%
~0.185%；Silicon：0.06%~0.14%；Manganese：1.63%~1.73%；Phosphorus：＜ 0.020%；Sulfur：＜ 0.002%；Chromium：
0.45%~0.55%；Nickel：0.08%~0.18%；Copper：0.255%~0.295%；Niobium：0.025%~0.035%；Titanium：
0.018%~0.028%；Boron：0.0015%-0.0025%, remaining is ferrum and inevitable impurity.
As further preferred embodiment, the yield strength Rel >=800MPa of high-strength cold rolling weather-resistant steel plate, tensile strength
Rm >=1100MPa, elongation percentage El >=7%；And horizontal d=a clod washes during 180 ° of high-strength cold rolling weather-resistant steel plate are qualified.
One or more embodiments of the invention, at least have the advantages that：
Due in embodiments of the present invention, in the manufacture process of high-strength cold rolling weather-resistant steel plate, employing by heating furnace
High-temperature heating, high-temperature final rolling and high temperature coiling technique, wherein, 1260 DEG C~1290 DEG C of heating-up temperature, 875 DEG C of finish rolling finishing temperature
~895 DEG C, 610 DEG C~630 DEG C of coiling temperature, 800 DEG C~820 DEG C of continuous annealing temperature, 30~45 DEG C/s of quick cooldown rate.
Course of hot rolling adopts high-temperature technology, roll-force is less, less demanding to equipment of hot rolling, it is ensured that hot rolling process is stablized
Property；Cold-rolled process is capable of achieving high-strength cold rolling weather-resistant steel plate using conventional continuous annealing equipment using the heating of middle temperature and middling speed cooling
Batch steady production.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into the had altered of the scope of the invention and change.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this to the embodiment of the present invention
The spirit and scope of bright embodiment.So, if these modifications of the embodiment of the present invention and modification belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprising these changes and modification.
Claims (3)
1. a kind of manufacture method of high-strength cold rolling weather-resistant steel plate, including following technological process：Continuous casting steel billet heating → thick de-scaling →
Fixed-width pressure machine → roughing → flying shear → essence de-scaling → finish rolling → section cooling → batch → pickling → cold rolling → continuous annealing →
It is smooth, it is characterised in that following technological parameter is controlled：
(1) in continuous casting steel billet heating technique, slab tapping temperature is 1260 DEG C~1290 DEG C；
(2) in the finish-rolling process, finish rolling finishing temperature is 875 DEG C~895 DEG C；
(3) in the coiling technique, coiling temperature is 610 DEG C~630 DEG C；
(4) in the continuous annealing process, 800 DEG C~820 DEG C of continuous annealing temperature, 30~45 DEG C/s of quick cooldown rate；
Wherein, the chemical composition (wt%) of the high-strength cold rolling weather-resistant steel plate is：Carbon：0.165%~0.185%；Silicon：0.06%
~0.14%；Manganese：1.63%~1.73%；Phosphorus：＜ 0.020%；Sulfur：＜ 0.002%；Chromium：0.45%~0.55%；Nickel：
0.08%~0.18%；Copper：0.255%~0.295%；Niobium：0.025%~0.035%；Titanium：0.018%~0.028%；
Boron：0.0015%-0.0025%, remaining is ferrum and inevitable impurity.
2. the method for claim 1, it is characterised in that yield strength Rel of the high-strength cold rolling weather-resistant steel plate >=
800MPa, tensile strength Rm >=1100MPa, elongation percentage El >=7%；And it is horizontal during 180 ° of the high-strength cold rolling weather-resistant steel plate
D=a clod washes are qualified.
3. a kind of high-strength cold rolling weather-resistant steel plate, it is characterised in that the high-strength cold rolling weather-resistant steel plate is by described in claim 1 or 2
Method be fabricated by.
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| CN109465295B (en) * | 2018-08-06 | 2020-06-09 | 首钢集团有限公司 | Method for preventing edge cracking and strip breakage of hot continuous rolled steel plate in cold rolling |
| CN114381580B (en) * | 2020-10-19 | 2023-12-12 | 宝山钢铁股份有限公司 | Cover annealing process and manufacturing method of high corrosion-resistant weather-resistant steel |
| CN117181810B (en) * | 2023-09-26 | 2024-04-19 | 江苏甬金金属科技有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel strip |
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| JP3940301B2 (en) * | 2002-02-27 | 2007-07-04 | 新日本製鐵株式会社 | Blasting weathering high-strength steel plate with excellent bending resistance and method for producing the same |
| JP5266836B2 (en) * | 2008-03-28 | 2013-08-21 | Ｊｆｅスチール株式会社 | Method of manufacturing a steel material excellent in fatigue crack propagation resistance and ductility |
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