CN107385334A - A kind of steel strand wires wire rod and its manufacturing process - Google Patents
A kind of steel strand wires wire rod and its manufacturing process Download PDFInfo
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- CN107385334A CN107385334A CN201710652652.7A CN201710652652A CN107385334A CN 107385334 A CN107385334 A CN 107385334A CN 201710652652 A CN201710652652 A CN 201710652652A CN 107385334 A CN107385334 A CN 107385334A
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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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to field of metallurgy, discloses a kind of steel strand wires wire rod and its manufacturing process, and steel strand wires wire rod includes by weight percentage：0.79~0.82%C, 0.15~0.35%Si, 0.6~0.9%Mn, 0.26~0.32%Cr and 0.04~0.07%V, surplus are Fe and impurity.Its manufacturing process includes smelting step, refinement step, casting step and steel rolling step.Wherein the Composition Control of molten steel is to include 0.79~0.82wt%C, 0.15~0.35wt%Si, 0.6~0.9wt%Mn, 0.26~0.32wt%Cr and 0.04~0.07wt%V by refinement step.The defects of V added in steel reduces the carbon segregation, component segregation and uneven microstructure of wire rod so that intensity, the plasticity of wire rod are improved.
Description
Technical field
The present invention relates to field of metallurgy, and more particularly to a kind of steel strand wires wire rod and its manufacturing process.
Background technology
Steel strand wires in the industrial production be widely used in engineering.Steel strand wires are screwed up by more steel wires and formed, its intensity by
The intensity effect of steel wire is very big, and the intensity of steel wire depends on the quality of wire rod, and the steel strand wires of high strength and large specification are often used
The steel wire of big specification, and the steel wire of big specification will be formed by the wire rod drawing of big specification.Existing production technology is big in production
Problems with is faced during specification 82B wire rods：(1) compared with producing 10~Φ of Φ 12.5mm small dimension 82B wire rods, Φ is rolled
14mm~Φ 15mm big specification 82B wire rods are it is necessary to use the strand of big cross section, to ensure that the compression ratio from strand to wire rod is enough
Greatly, make finished product wire rod fine and close, but roll the problem of big cross section can face draught pressure deficiency；(2) because the horizontal stroke of big specification wire rod
Section is big, and in the cooling procedure after rolling, the cooling velocity from wire rod surface to center differs greatly, from wire rod surface to center
Tissue it is more uneven, performance difference is also big；(3) compared with producing the wire rod of small dimension, when producing big specification wire rod, casting
Base center is that the tissue and performance for causing the carbon segregation at wire rod center to make finished product wire rod from outer surface to center are more uneven.Cause
This, when producing big specification wire rod, because draught pressure is small, inhomogeneous cooling is even so that the coarse grains of finished product wire rod, organize not
Uniformly and segregation is serious, and then makes the low intensity of wire rod, plasticity poor.
The content of the invention
It is an object of the invention to provide a kind of steel strand wires wire rod, and it has higher intensity and plasticity.
Another object of the present invention is to provide a kind of manufacture craft of steel strand wires wire rod, there is higher-strength to make
With the steel strand wires wire rod of plasticity.
The present invention is solved its technical problem and realized using following technical scheme.
The present invention provides a kind of steel strand wires wire rod, and it includes by weight percentage：0.79~0.82%C, 0.15~
0.35%Si, 0.6~0.9%Mn, 0.26~0.32%Cr and 0.04~0.07%V, surplus are Fe and impurity.
In an embodiment of the present invention, above-mentioned steel strand wires are accounted for the S in the impurity of wire rod in steel strand wires with wire rod
Than≤0.015wt%, P accounting≤0.025wt% in steel strand wires wire rod in impurity.
The present invention provides a kind of manufacturing process for manufacturing above-mentioned steel strand wires wire rod, and it includes：
Smelting step：It is molten steel that raw material comprising molten iron, which is smelted,；
Refinement step：By the Composition Control of molten steel be 0.79~0.82wt%C, 0.15~0.35wt%Si, 0.6~
0.9wt%Mn, 0.26~0.32wt%Cr and 0.04~0.07wt%V, surplus are Fe and impurity；
Casting step：The molten steel that refinement step is obtained is cast into strand；And
Steel rolling step：The strand that casting step obtains is rolled.
In an embodiment of the present invention, the smelting step of the manufacturing process of above-mentioned steel strand wires wire rod including the use of turn
Stove is smelted to molten iron；Molten iron include 0.25~0.80wt%Si, 0.20~0.80wt%Mn, P≤0.120wt%, S≤
0.040wt%, As≤0.015wt%, Ni≤0.10wt%, surplus are impurity and Fe；Temperature of the molten iron before converter is entered is high
In 1250 DEG C；Without using pig and cold-consolidated ball in smelting step.
In an embodiment of the present invention, in the smelting step of the manufacturing process of above-mentioned steel strand wires wire rod, using double
Slag method operates, 4~6min deslagging of blowing, and the basicity control of finishing slag is 3.2~3.6, and the molten steel smelted is imported ladle by converter
In, C during tapping in molten steel:0.12~0.3wt%, P≤0.012%, S≤0.025%.
In an embodiment of the present invention, in the manufacturing process of above-mentioned steel strand wires wire rod, by the good steel of converter smelting
Water is imported in ladle, and the tapping process of converter is tapped for circular jet, and controls the thickness of slag layer of molten steel surface in ladle to be less than 50mm；
Temperature of the ladle before molten steel is received is more than 900 DEG C.
In an embodiment of the present invention, the refinement step of the manufacturing process of above-mentioned steel strand wires wire rod uses LF stoves pair
Molten steel is refined, and Composition Control of the molten steel before LF stoves are entered is C：0.72~0.77wt%, Si：0.15~
0.20wt%, Mn：0.7~0.8wt%, P≤0.015wt%, S≤0.025wt%, Cr：0.26~0.28wt%, V：0.04~
0.07wt%, surplus are impurity and Fe.
In an embodiment of the present invention, after the completion of the smelting step of the manufacturing process of above-mentioned steel strand wires wire rod, to
Ladle puts into carburant, fero-manganesesilicon and Si-Ca-Ba alloys into ladle during tapping；Simultaneously add Cr-Fe alloys and
V-Fe alloys match somebody with somebody Cr and with V to realize.
In an embodiment of the present invention, molten steel at the end of the refinement step of the manufacturing process of above-mentioned steel strand wires wire rod
Temperature is 1525~1535 DEG C, coordinates the continuous casting operation of crystallizer progress in casting step including the use of tundish, and molten steel enters
Process to tundish carries out protective casting using sleeve pipe, and the process that molten steel enters crystallizer from tundish uses submersed nozzle
Protective casting is carried out, the degree of superheat of the molten steel in tundish is 25 ± 5 DEG C.
In an embodiment of the present invention, the steel rolling step of the manufacturing process of above-mentioned steel strand wires wire rod is included to casting
The strand that step obtains is heated, and reuses milling train and strand is rolled, temperature of the strand at inlet of rolling mill be 950~
1020℃。
A kind of steel strand wires of the embodiment of the present invention are with the beneficial effect of wire rod and its manufacturing process：
In the high-carbon steel that phosphorus content is 0.8wt% or so, 0.04~0.07wt% V is added, reduction steel can be played
In carbon segregation, phenomena such as component segregation and microstructure are uneven, so as to improve the intensity of wire rod and plasticity so that
When producing big specification wire rod, the intensity and plasticity of wire rod still disclosure satisfy that the requirement of stock is twisted with the fingers in user's drawing.
Embodiment
, below will be in the embodiment of the present invention to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, it is the conventional production that can be obtained by commercially available purchase
Product.
The steel strand wires of the embodiment of the present invention are specifically described with wire rod and its manufacturing process below.
A kind of steel strand wires wire rod, it includes by weight percentage：0.79~0.82%C, 0.15~0.35%Si,
0.6~0.9%Mn, 0.26~0.32%Cr and 0.04~0.07%V, surplus are Fe and impurity.By adding a certain amount of V
The defects of to reduce the carbon segregation in wire rod, component segregation and uneven microstructure, enable to manufacturing big specification wire rod (directly
14~15mm of footpath) when, ensure the intensity of wire rod.S in impurity accounting≤0.015wt% in steel strand wires wire rod, P in impurity
Accounting≤0.025wt% in steel strand wires wire rod, the impurity elements such as S, P are reduced to reduce the defects of hot-short, cold short.
The manufacturing process of steel strand wires wire rod successively include smelting step, refinement step, casting step, steel rolling step and
Follow-up cooling, bundling and storage.
1st, smelting step
This step is to smelt molten iron and steel scrap (using if necessary) to meet the molten steel of requirement.The part of molten iron into
Divide and temperature requirement is shown in Table 1.
The hot metal composition of table 1 and temperature requirement
In an embodiment of the present invention, employ top and bottom combined blown converter to smelt molten iron and steel scrap, in other situations
Under, blowing form is readily modified as top blast or bottom blowing.In raw materials for metallurgy, without using pig and cold-consolidated ball, to reduce containing for P, S
Amount.The composition and activity of the active lime used in converter are shown in Table 2.
The requirement of the stone ash composition of table 2 and activity degree
In smelting process, operated using double slag process, P is gone with slugging as early as possible, 4~6min deslagging of blowing.Finishing slag basicity according to
3.2~3.6 controls.Tap C：0.12wt%~0.30wt%, tap P≤0.012wt%, and tap S≤0.025wt%.Terminal C
<0.10wt%, P ＞ 0.015wt% change the other steel grades of refining.It is required that etc. sample tapping, first ensure P it is qualified.
When converter smelting is completed, it is necessary to which molten steel is imported into ladle, in order to ensure tapping hole in order, during tapping
Between be not less than 3.5min, and ensure circular jet tap.Using slag-stopping tapping, it is ensured that molten steel to ladle molten steel surface during LF refining station
Thickness of slag layer be less than 50mm, Steel ladle clearance 300mm~500mm.Pushing off the slag is bad to change the original sentence to other steel grades.
Ladle requirement：It is required that red packet tapping (ladle temperature >=900 DEG C), ladle bottom blowing brick is unimpeded, and ladle is clean, must not have
Wrap edge, it is ensured that big water-coating port is opened certainly during cast.
Alloying operation is carried out in tapping process, it is ensured that the cured effect before alloy use.Matched somebody with somebody using " low nitrogen carburant "
Carbon, manganese is matched somebody with somebody using fero-manganesesilicon.Add Si-Ca-Ba alloy final deoxidizings per stove, to consider that Si-Ca-Ba alloys increase Si amounts.Using Cr-Fe
With Cr, match somebody with somebody V with V-Fe.The target component that molten steel reaches LF refining station is listed in table 3, according to table 3 with addition of various alloys.Cr、V
Recovery rate consider that Fe-Cr and Fe-V are added in ladle with other alloys by 90%.
The molten steel of table 3 reaches the composition at LF refining station, wt%
| Composition | C | Si | Mn | P | S | Cr | V |
| Content | 0.72-0.77 | 0.15-0.20 | 0.70-0.80 | ≤0.015 | ≤0.025 | 0.26-0.28 | 0.04-0.07 |
The temperature of tapping is 1610~1640 DEG C, and the temperature reached before refining station progress refinement step is 1500~1530
℃。
2nd, refinement step
The composition and temperature of molten steel are adjusted by refinement step.Whole process enters the station including molten steel → and it is thermometric, pre-
Ar → enter position → once heating → thermometric, sampling → is blown to heat, make white slag → composition coarse adjustment → thermometric, sampling → refining, composition
Fine setting → thermometric → goes out position → composition and divides accurate adjustment, feeds silk, sampling → soft blow Ar, thermometric → plus heat preserving agent → casting (next work
Sequence).
At a temperature of corresponding arrive at a station, using slugging under corresponding gear, liquid white slag is formed in power supply 10min, is protected
Form white slag in testimony electricity 15min, FeO+MnO≤1% in slag, and kept for the white slag time be not less than 10min, addition lime, essence
Slag slag making is refined, and lime consumption regulation is increased according to in-furnace temperature, molten steel S contents and slugging situation.Using calcium carbide, SiFe powder
(granularity≤3mm), aluminium vanadine (50kg/ stoves) make white slag.Refining process adjusts argon flow amount, prevents refining from turning over excessive slag greatly, and adjust
Save dedusting fan air quantity and ensure positive pressure operation.
LF stoves are disposed, and feed pure Ca lines 30m/ stoves, and soft argon blowing time is more than 12min after feeding silk, pico- with the top of the slag
Springing up not exposed molten steel face is advisable.Refining treatment terminates oxygen activity desired value≤10ppm.
The desired value of each composition of molten steel is after refining：C:0.8wt%, Si：0.2wt%, Mn：0.82wt%, P：≤
0.015wt%, S：≤ 0.008wt%, Cr：0.28wt%, V：0.05wt%.In the case where allowing certain fluctuation, after refining
The scope of liquid steel temperature and composition is shown in Table 4.
The scope of liquid steel temperature and composition after table 4 refines
| Composition | C | Si | Mn | P | S≤ | Cr | V | Temperature, DEG C |
| Content, wt% | 0.79~0.82 | 0.15~0.35 | 0.6~0.9 | ≤0.025 | ≤0.015 | 0.26~0.32 | 0.04~0.07 | 1525~1535 |
In the embodiment cited by the present invention, molten steel is refined using LF stoves, it should be appreciated that refining equipment is not only
It is limited to LF stoves or other refining equipments.
3rd, casting step
Casting step uses continuous casting process.Big bag is from the time being poured onto on sleeve pipe set is opened less than 30 seconds.Using privacy protection
Slag, full guard cast.The parameter of M-EMS is：3.5Hz, 320A.
Production section is 160mm × 160mm square billets, and cut lengths is performed by the production schedule.Poured into a mould using stopper, pulling rate
1.75 ± 0.02m/min (master control room data), Water Rate for Secondary Cooling Water 0.78L/kg.Metal in Tundish degree of superheat target presses 25 ± 5
DEG C control, with reference to 1468 DEG C of liquidus temperature, to prevent waterstop port dross.
Mean temperature is poured as 1500 DEG C by company, and tundish mean temperature leaves pending higher than the strand of this temperature.Temperature with
Temperature-measuring gun result is defined.
Full package operation is must assure that during continuous casting, even 400mm must not be less than to tundish by pouring process liquid level, because being tied in casting
Liquid level is relatively low before beam, and contained in molten steel to be mingled with more, and the top of the slag is relatively low, and control casting liquid level is in order to anti-not less than 400mm
Only excessive field trash enters crystallizer, is also prevented from the generation of slag phenomenon, influences slab quality.
Straightening temperature controls：Straightening temperature controls >=900 DEG C, avoids straightening cracks sensitizing range.The strand heap that casting is completed
In slow cooling on other hot bases, temperature retention time is not less than 48 hours pile, so, can prevent from causing strand planted agent because cooling velocity is fast
Power is big and ftractures (because Cr, V, C of this steel are higher), while is advantageous to the discharge of gas in strand (such as hydrogen), and then strand is sent
Steel rolling heating rolling.
4th, steel rolling step
Strand to be heated first with heating furnace, bringing-up section control is 1150~1210 DEG C, soaking zone 1130~
1180 DEG C, reach inlet of rolling mill at steel billet temperature be 950~1020 DEG C, 970 DEG C of target, steel billet head, in, the tail temperature difference≤50
DEG C, prevent steel billet from phenomena such as overheat, burning occur in heating process, be micro- reducing atmosphere in stove；If stop rolling the time in 30min
900 DEG C of insulations are cooled to immediately above.
Rolling specs：Φ 14mm~Φ 15mm.Number≤40 are rolled per hour, and this is to ensure steel billet in stove
Heat time, Cr, V element is allowed fully to be dissolved into steel so that follow-up precipitating reinforcing effect is good.Raw antenatal exaination de-scaling system
System, it is ensured that system normal nozzles carry out de-scaling without blocking using highest gear；Roller table speed is improved after descaling of steel stock, is quickly entered
Enter first of mill milling, so, for strand after just high pressure descaling water has been sprayed, surface temperature is relatively low, and surface turns into crust layer,
Before casting billet surface rises again softening, strand rapidly enters milling train, and draught pressure can be made to be delivered to by the crust layer of casting billet surface
Strand center, dissipated so as to which the carbon segregation at strand center is ground, can also make the microstructure at center tiny and fine and close, thus may be used
To improve the quality of finished product wire rod；Go out pre- to wear 880~910 DEG C of coolant-temperature gage；Laying temperature control is at 830~870 DEG C, desired value
850℃。
5th, cooling conveying
After being rolled into wire rod, the wire rod of high temperature enters air-cooled line.There are 20 Fans on air-cooled line, and arrange successively.1#
~13# blower fan adjacent spaces 3m, 14#~20# blower fan adjacent spaces are 6m.The setting of blower fan roller-way principal velocity is as shown in table 5.It should note
Meaning, 50Hz represent standard-sized sheet.
The blower fan of table 5, roller-way principal velocity parameter
Stay-warm case corresponding to 1~13# blower fans is fully open, on remaining (14# blower fans and corresponding to) insulation shroud later.
Other are required：
(1) before rolling, the service condition of the guide and guard of each frame inlet and outlet, groove is checked, wanted to not meeting quality
Change in time.
(2) circle of wire rod head shearing 3, the circle of afterbody shearing 3.Such as defect, shearing is not clean, then increases shearing dynamics, until
Untill cutting totally.
(3) finished product appearance and size precision controlling:Out-of-roundness≤0.30mm.Finished surface should be smooth, and what is be visible by naked eyes splits
Line, folding, the ears or side handles of a utensil, the defects of scabbing, be layered and being mingled with, it is allowed to have the projection, cut, pitted skin of impression and part, its depth or
B, C precision highly (are counted) from actual size and cannot be greater than 0.10mm, forbids bull occur.
(4) disk circle is forbidden to stop roller-way operating or reduction of speed when running on cold scattering roller-way, and otherwise the disk on roller-way is full
Sentence useless in portion.Forbid to raise speed on cold scattering roller-way in disk rounded tail portion.
(5) because the cooling of big specification wire rod is slow, to avoid packing silk ankle injury in packing or strangling disconnected hot plate bar, so wire rod
Wire rod temperature should be allowed to lower, then packed on PF supply lines after circulation primary.Strict control wire rod surface quality, beats
8 are wrapped, if wire rod surface has mechanical abrasion to wait to sentence reason.
(6) first one layer of straw mattress is spread on ground before wire rod stacking.
Mechanical properties test examines intensity after using artificial aging, and tensile strength should be greater than 1180MPa, and the contraction percentage of area is big
In 25%.
The feature of the present invention is described in further detail with reference to embodiments.
Embodiment 1
The manufacturing process for the steel strand wires wire rod that the present embodiment provides comprises the following steps：
S1, smelting step
The fractions such as molten iron of table 1 and steel scrap are smelted using 100t top and bottom combined blown converter, make tapping
Molten steel composition reaches C：0.12wt%, P≤0.012wt%, S≤0.025wt%.
Tapping carries out alloying operation simultaneously, and adding " low nitrogen carburant " in ladle matches somebody with somebody carbon, adds fero-manganesesilicon and matches somebody with somebody manganese.Per stove
Add Si-Ca-Ba alloy final deoxidizings.Cr is matched somebody with somebody using Cr-Fe, matches somebody with somebody V with V-Fe.According to table 3 with addition of various alloys.
S2, refinement step
The composition and temperature of molten steel are adjusted by refinement step.Whole process enters the station including molten steel → and it is thermometric, pre-
Ar → enter position → once heating → thermometric, sampling → is blown to heat, make white slag → composition coarse adjustment → thermometric, sampling → refining, composition
Fine setting → thermometric → goes out position → composition accurate adjustment, feeds silk, sampling → soft blow Ar, thermometric → plus heat preserving agent → casting (subsequent processing).
At a temperature of corresponding arrive at a station, using slugging under corresponding gear, liquid white slag is formed in power supply 10min, is protected
Form white slag in testimony electricity 15min, FeO+MnO≤1% in slag, and kept for the white slag time be not less than 10min, addition lime, essence
Slag slag making is refined, and lime consumption regulation is increased according to in-furnace temperature, molten steel S contents and slugging situation.Using calcium carbide, SiFe powder
(granularity≤3mm), aluminium vanadine (50kg/ stoves) make white slag.Refining process adjusts argon flow amount, prevents refining from turning over excessive slag greatly, and adjust
Save dedusting fan air quantity and ensure positive pressure operation.
LF stoves are disposed, and feed pure Ca lines 30m/ stoves, and soft argon blowing time is more than 12min after feeding silk, pico- with the top of the slag
Springing up not exposed molten steel face is advisable.Refining treatment terminates oxygen activity desired value≤10ppm.
Refining cycle (enter LF stove heats position to go out LF stove heats position) is controlled by 40min ± 1min.
Each component content of molten steel and liquid steel temperature at the end of refining are：
| Composition | C | Si | Mn | P | S | Cr | V | Temperature, DEG C |
| Content, wt% | 0.8 | 0.15 | 0.82 | 0.02 | 0.008 | 0.26 | 0.04 | 1525 |
S3, casting step
Casting cycle uses the continuous casting mode of tundish+crystallizer, and big bag arrives tundish and tundish is equal to crystallizer
Cast using the full guard of immersion, avoid aoxidizing.In the present embodiment, the square billet using casting section as 160mm × 160mm is
, in other embodiment, cross dimensions can be adjusted, and other relevant parameters should also be as appropriate change to match production.
M-EMS parameter is 3.5Hz, 320A, using stopper control flow, Casting speed is 1.75 ±
0.02m/min, in other examples, pulling rate can be adjusted according to actual conditions.
The degree of superheat control targe of Metal in Tundish is 25 DEG C, is fluctuated no more than 5 DEG C, avoid because the degree of superheat is too low and
Nozzle clogging, or the degree of superheat are too high and cause that green shell is excessively thin and strand central defect aggravates.Liquid level during trough casting
Highly keep more than 400mm.
Straightening temperature controls：Straightening temperature controls >=900 DEG C, avoids straightening cracks sensitizing range.The strand heap that casting is completed
Pile is in slow cooling on other hot bases.
S4, steel rolling step
Strand is heated first with heating furnace, bringing-up section control is 1150 DEG C, 1130 DEG C of soaking zone, reaches milling train
The steel billet temperature of porch be 950 DEG C, steel billet head, in, the tail temperature difference≤50 DEG C.
In the present embodiment, rolling specs Φ 14mm.Number 35 is rolled per hour.Raw antenatal exaination descaling system, really
Insurance system normal nozzles carry out de-scaling without blocking using highest gear；Roller table speed is improved after descaling of steel stock, rapidly enters milling train
Rolling；Go out pre- to wear 880 DEG C of coolant-temperature gage；Laying temperature control is 850 DEG C.
Wire rod after spinning is cooled down into air-cooled line, and then bundling is put in storage.
Embodiment 2
The manufacturing process for the steel strand wires wire rod that the present embodiment provides comprises the following steps：
S1, smelting step
The fractions such as molten iron of table 1 and steel scrap are smelted using 100t top and bottom combined blown converter, make tapping
Molten steel composition reaches C：0.20wt%, P≤0.012wt%, S≤0.025wt%.
Tapping carries out alloying operation simultaneously, and adding " low nitrogen carburant " in ladle matches somebody with somebody carbon, adds fero-manganesesilicon and matches somebody with somebody manganese.Per stove
Add Si-Ca-Ba alloy final deoxidizings.Cr is matched somebody with somebody using Cr-Fe, matches somebody with somebody V with V-Fe.According to table 3 with addition of various alloys.
S2, refinement step
The composition and temperature of molten steel are adjusted by refinement step.Whole process enters the station including molten steel → and it is thermometric, pre-
Ar → enter position → once heating → thermometric, sampling → is blown to heat, make white slag → composition coarse adjustment → thermometric, sampling → refining, composition
Fine setting → thermometric → goes out position → composition accurate adjustment, feeds silk, sampling → soft blow Ar, thermometric → plus heat preserving agent → casting (subsequent processing).
At a temperature of corresponding arrive at a station, using slugging under corresponding gear, liquid white slag is formed in power supply 10min, is protected
Form white slag in testimony electricity 15min, FeO+MnO≤1% in slag, and kept for the white slag time be not less than 10min, addition lime, essence
Slag slag making is refined, and lime consumption regulation is increased according to in-furnace temperature, molten steel S contents and slugging situation.Using calcium carbide, SiFe powder
(granularity≤3mm), aluminium vanadine (50kg/ stoves) make white slag.Refining process adjusts argon flow amount, prevents refining from turning over excessive slag greatly, and adjust
Save dedusting fan air quantity and ensure micro-pressure operation.
LF stoves are disposed, and feed pure Ca lines 30m/ stoves, and soft argon blowing time is more than 12min after feeding silk, pico- with the top of the slag
Springing up not exposed molten steel face is advisable.Refining treatment terminates oxygen activity desired value≤10ppm.
Refining cycle (enter LF stove heats position to go out LF stove heats position) is controlled by 40min ± 1min.
Each component content of molten steel and liquid steel temperature at the end of refining are：
| Composition | C | Si | Mn | P | S | Cr | V | Temperature, DEG C |
| Content, wt% | 0.79 | 0.25 | 0.6 | 0.015 | 0.01 | 0.28 | 0.05 | 1530 |
S3, casting step
Casting cycle uses the continuous casting mode of tundish+crystallizer, and big bag arrives tundish and tundish is equal to crystallizer
Cast using the full guard of immersion, avoid aoxidizing.In the present embodiment, the square billet using casting section as 160mm × 160mm is
, in other embodiment, cross dimensions can be adjusted, and other relevant parameters should also be as appropriate change to match production.
M-EMS parameter is 3.5Hz, 320A, and using stopper control flow, pulling rate is 1.75 ± 0.02m/
Min, in other examples, pulling rate can be adjusted according to actual conditions.
The degree of superheat control targe of Metal in Tundish is 25 DEG C, is fluctuated no more than 5 DEG C, avoid because the degree of superheat is too low and
Nozzle clogging, or the degree of superheat are too high and cause that green shell is excessively thin and strand central defect aggravates.Liquid level during trough casting
Highly keep more than 400mm.
Straightening temperature controls：Straightening temperature controls >=900 DEG C, avoids straightening cracks sensitizing range.The strand heap that casting is completed
Pile is in slow cooling on other hot bases.
S4, steel rolling step
Strand is heated first with heating furnace, bringing-up section control is 1180 DEG C, 1160 DEG C of soaking zone, reaches milling train
The steel billet temperature of porch be 970 DEG C, steel billet head, in, the tail temperature difference≤50 DEG C.
In the present embodiment, rolling specs Φ 15mm.Number 30 is rolled per hour.Raw antenatal exaination descaling system, really
Insurance system normal nozzles carry out de-scaling without blocking using highest gear；Roller table speed is improved after descaling of steel stock, rapidly enters milling train
Rolling；Go out pre- to wear 900 DEG C of coolant-temperature gage；Laying temperature control is 830 DEG C.
Wire rod after spinning is cooled down into air-cooled line, and then bundling is put in storage.
Embodiment 3
The manufacturing process for the steel strand wires wire rod that the present embodiment provides comprises the following steps：
S1, smelting step
The fractions such as molten iron of table 1 and steel scrap are smelted using 100t top and bottom combined blown converter, make tapping
Molten steel composition reaches C：0.30wt%, P≤0.012wt%, S≤0.025wt%.
Tapping carries out alloying operation simultaneously, and adding " low nitrogen carburant " in ladle matches somebody with somebody carbon, adds fero-manganesesilicon and matches somebody with somebody manganese.Per stove
Add Si-Ca-Ba alloy final deoxidizings.Cr is matched somebody with somebody using Cr-Fe, matches somebody with somebody V with V-Fe.According to table 3 with addition of various alloys.
S2, refinement step
The composition and temperature of molten steel are adjusted by refinement step.Whole process enters the station including molten steel → and it is thermometric, pre-
Ar → enter position → once heating → thermometric, sampling → is blown to heat, make white slag → composition coarse adjustment → thermometric, sampling → refining, composition
Fine setting → thermometric → goes out position → composition accurate adjustment, feeds silk, sampling → soft blow Ar, thermometric → plus heat preserving agent → casting (subsequent processing).
At a temperature of corresponding arrive at a station, using slugging under corresponding gear, liquid white slag is formed in power supply 10min, is protected
Form white slag in testimony electricity 15min, FeO+MnO≤1% in slag, and kept for the white slag time be not less than 10min, addition lime, essence
Slag slag making is refined, and lime consumption regulation is increased according to in-furnace temperature, molten steel S contents and slugging situation.Using calcium carbide, SiFe powder
(granularity≤3mm), aluminium vanadine (50kg/ stoves) make white slag.Refining process adjusts argon flow amount, prevents refining from turning over excessive slag greatly, and adjust
Save dedusting fan air quantity and ensure micro-pressure operation.
LF stoves are disposed, and feed pure Ca lines 30m/ stoves, and soft argon blowing time is more than 12min after feeding silk, pico- with the top of the slag
Springing up not exposed molten steel face is advisable.Refining treatment terminates oxygen activity desired value≤10ppm.
Refining cycle (enter LF stove heats position to go out LF stove heats position) is controlled by 40min ± 1min.
Each component content of molten steel at the end of refining is：
| Composition | C | Si | Mn | P | S | Cr | V | Temperature, DEG C |
| Content, wt% | 0.82 | 0.35 | 0.9 | 0.025 | 0.015 | 0.32 | 0.07 | 1535 |
S3, casting step
Casting cycle uses the continuous casting mode of tundish+crystallizer, and big bag arrives tundish and tundish is equal to crystallizer
Cast using the full guard of immersion, avoid aoxidizing.In the present embodiment, the square billet using casting section as 160mm × 160mm is
, in other embodiment, cross dimensions can be adjusted, and other relevant parameters should also be as appropriate change to match production.
M-EMS parameter is 3.5Hz, 320A, and using stopper control flow, pulling rate is 1.75 ± 0.02m/
Min, in other examples, pulling rate can be adjusted according to actual conditions.
The degree of superheat control targe of Metal in Tundish is 25 DEG C, is fluctuated no more than 5 DEG C, avoid because the degree of superheat is too low and
Nozzle clogging, or the degree of superheat are too high and cause that green shell is excessively thin and strand central defect aggravates.Liquid level during trough casting
Highly keep more than 400mm.
Straightening temperature controls：Straightening temperature controls >=900 DEG C, avoids straightening cracks sensitizing range.The strand heap that casting is completed
Pile is in slow cooling on other hot bases.
S4, steel rolling step
Strand is heated first with heating furnace, bringing-up section control is 1210 DEG C, 1180 DEG C of soaking zone, reaches milling train
The steel billet temperature of porch be 1020 DEG C, steel billet head, in, the tail temperature difference≤50 DEG C.
In the present embodiment, rolling specs Φ 14mm.Number 35 is rolled per hour.Raw antenatal exaination descaling system, really
Insurance system normal nozzles carry out de-scaling without blocking using highest gear；Roller table speed is improved after descaling of steel stock, rapidly enters milling train
Rolling；Go out pre- to wear 910 DEG C of coolant-temperature gage；Laying temperature control is 870 DEG C.
Wire rod after spinning is cooled down into air-cooled line, and then bundling is put in storage.
Embodiments described above is part of the embodiment of the present invention, rather than whole embodiments.The reality of the present invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of steel strand wires wire rod, it is characterised in that the steel strand wires wire rod includes by weight percentage：0.79~
0.82%C, 0.15~0.35%Si, 0.6~0.9%Mn, 0.26~0.32%Cr and 0.04~0.07%V, surplus Fe
And impurity.
2. steel strand wires wire rod according to claim 1, it is characterised in that the S in the impurity uses in the steel strand wires
Accounting≤0.015wt% in wire rod, P accounting≤0.025wt% in the steel strand wires wire rod in the impurity.
A kind of 3. manufacturing process for manufacturing the steel strand wires wire rod as any one of claim 1 to 2, it is characterised in that
It includes：
Smelting step：It is molten steel that raw material comprising molten iron, which is smelted,；
Refinement step：It is 0.79~0.82wt%C, 0.15~0.35wt%Si, 0.6~0.9wt% by the Composition Control of molten steel
Mn, 0.26~0.32wt%Cr and 0.04~0.07wt%V, surplus are Fe and the impurity；
Casting step：The molten steel that the refinement step obtains is cast into strand；And
Steel rolling step：The strand obtained to the casting step rolls.
4. the manufacturing process of steel strand wires wire rod according to claim 3, it is characterised in that the smelting step includes making
The molten iron is smelted with converter；The molten iron include 0.25~0.80wt%Si, 0.20~0.80wt%Mn, P≤
0.120wt%, S≤0.040wt%, As≤0.015wt%, Ni≤0.10wt%, surplus are impurity and Fe；The molten iron is entering
Enter the temperature before converter higher than 1250 DEG C；Without using pig and cold-consolidated ball in the smelting step.
5. the manufacturing process of steel strand wires wire rod according to claim 4, it is characterised in that in the smelting step, adopt
Operated with double slag process, 4~6min deslagging of blowing, the basicity control of finishing slag is 3.2~3.6, the molten steel that the converter will have been smelted
Import in ladle, C during tapping in molten steel:0.12~0.3wt%, P≤0.012%, S≤0.025%.
6. the manufacturing process of steel strand wires wire rod according to claim 4, it is characterised in that the converter smelting is good
Molten steel is imported in ladle, and the tapping process of the converter is tapped for circular jet, and controls the slag blanket of molten steel surface in the ladle thick
Degree is less than 50mm；Temperature of the ladle before molten steel is received is more than 900 DEG C.
7. the manufacturing process of steel strand wires wire rod according to claim 3, it is characterised in that the refinement step uses LF
Stove refines to molten steel, and Composition Control of the molten steel before LF stoves are entered is C：0.72~0.77wt%, Si：0.15~
0.20wt%, Mn：0.7~0.8wt%, P≤0.015wt%, S≤0.025wt%, Cr：0.26~0.28wt%, V：0.04~
0.07wt%, surplus are impurity and Fe.
8. the manufacturing process of steel strand wires wire rod according to claim 3, it is characterised in that the smelting step is completed
Afterwards, carburant, fero-manganesesilicon and Si-Ca-Ba alloys are put into the ladle during ladle tapping；Add Cr- simultaneously
Fe alloys and V-Fe alloys match somebody with somebody Cr and with V to realize.
9. the manufacturing process of steel strand wires wire rod according to claim 3, it is characterised in that at the end of the refinement step
Liquid steel temperature is 1525~1535 DEG C, coordinates the continuous casting operation of crystallizer progress in the casting step including the use of tundish,
The process that molten steel enters the tundish carries out protective casting using sleeve pipe, and molten steel enters the crystallizer from the tundish
Process protective casting is carried out using submersed nozzle, the degree of superheat of the molten steel in the tundish is 25 ± 5 DEG C.
10. the manufacturing process of steel strand wires wire rod according to claim 3, it is characterised in that the steel rolling step includes
The strand obtained to the casting step heats, and reuses milling train and the strand is rolled, the strand is in milling train
The temperature of porch is 950~1020 DEG C.
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| CN107747048A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Nb, Ti, Cr microalloy |
| CN107747053A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy |
| CN107955899A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Nb microalloy |
| CN107955906A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its production method are built containing V, Nb microalloy |
| CN107955900A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel wire rod and its production method are built containing V, Nb, Ti microalloy |
| CN108220780A (en) * | 2018-01-19 | 2018-06-29 | 天津荣程联合钢铁集团有限公司 | A kind of steel billet and its processing technology |
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| CN113088811A (en) * | 2021-03-04 | 2021-07-09 | 天津荣程联合钢铁集团有限公司 | Niobium-containing alloy steel and preparation method thereof |
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| CN108220780A (en) * | 2018-01-19 | 2018-06-29 | 天津荣程联合钢铁集团有限公司 | A kind of steel billet and its processing technology |
| CN111678332A (en) * | 2020-05-12 | 2020-09-18 | 首钢集团有限公司 | Alloy baking method for reducing blockage rate of burner |
| CN113088811A (en) * | 2021-03-04 | 2021-07-09 | 天津荣程联合钢铁集团有限公司 | Niobium-containing alloy steel and preparation method thereof |
| CN113897544A (en) * | 2021-09-02 | 2022-01-07 | 包头钢铁（集团）有限责任公司 | Wire rod for rare earth high-strength high-toughness prestressed steel strand and smelting and rolling production method thereof |
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Application publication date: 20171124 |