CN105665662A - ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires - Google Patents
ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires Download PDFInfo
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- CN105665662A CN105665662A CN201610133773.6A CN201610133773A CN105665662A CN 105665662 A CN105665662 A CN 105665662A CN 201610133773 A CN201610133773 A CN 201610133773A CN 105665662 A CN105665662 A CN 105665662A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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Abstract
The invention provides an ESP (endless strip production) line-based method for manufacturing steel for flux-cored wires. The method comprises steps as follows: a steel-making phase: blast furnace molten iron is sequentially subjected to desulfuration, converter smelting, refining and vacuum circulating degassing to form molten steel; an ESP continuous casting and continuous rolling phase: on the basis of an ESP line, the molten steel formed in the steel-making phase is subjected to continuous casting and continuous rolling to form thin-gauge hot-rolled steel strips; a cooling phase: the thin-gauge hot-rolled steel strips formed in the ESP continuous casting and continuous rolling phase are subjected to laminar cooling; a coiling phase: the thin-gauge hot-rolled steel strips subjected to laminar cooling is coiled to form roll-shaped hot-rolled coils; a pickling phase: the roll-shaped hot-rolled coils coiled in the coiling phase are pickled; a leveling and re-coiling phase: the pickled hot-rolled coils are leveled and re-coiled, and the steel for the flux-cored wires is obtained. With the adoption of the method, energy consumption can be reduced, the metal yield can be increased, and the production cost can be reduced.
Description
Technical field
The present invention relates to metallurgical technology field, more specifically, relate to a kind of flux-cored wire steel making method based on ESP line.
Background technology
Flux-cored wire, also referred to as flux cored wire, is the class consumable material being specifically designed to welding in powder core wire. Flux-cored wire is made up of metal sheath and powder core two parts, the material of crust can be selected for mild steel, rustless steel, aluminum, copper, zinc etc. and has the material of certain ductility, the material of core can according to product purpose need in very large range select each metalloid or non-metal powder, mineral powder, chemical products and nano material etc.
At present, the primary raw material producing flux-cored wire steel is cold-rolled strip, and it is typically on forming machine by continuous for cold-rolled strip roll-forming, and synchronizes to add medicated powder, then on linear drawing machine draw tube reducing to finished product welding wire. Wherein, width and the thickness of the Fruit variety cold-rolled strip producing flux-cored wire it are typically based on.
Wherein, traditional produce flux-cored wire steel idiographic flow be: high-quality is blast-melted → KR desulfurization → converter smelting → LF refine → RH is degassed → continuous casting → strand post bake → roughing → finish rolling → section cooling → batch → pickling → cold rolling → annealing → smooth → rewinding → sampling → inspection → packaging → warehouse-in.
By above-mentioned flow process it can be seen that need strand post bake in traditional process producing flux-cored wire, also again to cool down after the operation such as roughing, finish rolling, on the one hand, this can make the recovery rate of metal decline, increase production cost; On the other hand, traditional process producing flux-cored wire needs heating cooling, reheating to cool down again, and therefore, this can strengthen the consumption of the energy, increases the discharge of greenhouse gases and harmful gas, causes environmental pollution; Further, owing to needing width and the thickness of the Fruit variety cold-rolled strip according to flux-cored wire, therefore, the consumption of flux-cored wire special steel strip increases rapidly along with the increase of flux-cored wire, and this also can increase the cost producing flux-cored wire undoubtedly. It addition, at present, the cold-rolled strip used by flux-cored wire steel is produced, it is necessary to producing after pickling, cold rolling, annealing, the concerned process steps such as smooth at hot rolled coil, so many operation necessarily causes the increase of production cost.
Summary of the invention
In view of the above problems, it is an object of the invention to provide a kind of flux-cored wire steel making method based on ESP line, the problems such as the production cost to solve the traditional flux-cored wire steel method that produces existence is high, environmental pollution is big.
Flux-cored wire steel making method based on ESP line provided by the invention, including: the steel-making stage: form molten steel successively after desulfurization, converter smelting, refine and vacuum circulation degassing by blast-melted, the ESP continuous casting and rolling stage: based on ESP line, the molten steel that the steel-making stage is formed is carried out continuous casting and rolling and form Thin Specs hot rolled strip, wherein, in the ESP continuous casting and rolling stage, by adopting non-sinusoidal oscillation of mould pattern and brake type Duckbill type soaking water gap to control the Temperature Distribution of the frictional force between crystallizer and green shell and molten steel in mold, and pass through mould electromagnetic brake, bending section with wick-containing pressure, and the segmental arc with aligning, horizontal segment, after once cooling and cooling twice, described molten steel is carried out continuous casting and forms continuous casting billet, it is intermediate blank by roughing mill by continuous casting billet milling, after intermediate blank carries out electromagnetic induction heating, high-pressure water descaling processes, and by finishing mill, the intermediate blank after high-pressure water descaling processes is rolled into Thin Specs hot rolled coil through finishing mill completely without head, wherein, the endoporus of brake type Duckbill type soaking water gap includes two openings, is respectively arranged with downward-sloping pod apertures on the sidewall of each opening, cooling stage: the Thin Specs hot rolled strip that the ESP continuous casting and rolling stage is formed is carried out section cooling, coil ing one: undertaken batching formation drum hot rolled coil by the Thin Specs hot rolled strip after carrying out section cooling, pickling stages: the drum hot rolled coil batched by coil ing one carries out pickling, the smooth rewinding stage: the hot rolled coil after pickling is carried out smooth and rewinding acquisition flux-cored wire steel.
In addition, preferred mode is: by mould electromagnetic brake, the bending section with wick-containing pressure, the segmental arc with aligning, horizontal segment, after once cooling and cooling twice, after molten steel is carried out continuous casting formation continuous casting billet, continuous casting billet enters HRM and carries out roughing, is intermediate blank by HRM by continuous casting billet milling; Ensured the surface temperature of intermediate blank by IHF induction heater, intermediate blank scale on surface is carried out high-pressure water descaling process simultaneously; Intermediate blank after high-pressure water descaling processes enters finishing mill, by finishing mill, completely without head, the intermediate blank after high-pressure water descaling is rolled into Thin Specs hot rolled strip.
Furthermore it is preferred that mode be: in the process that the Thin Specs hot rolled strip that the ESP continuous casting and rolling stage is formed is carried out section cooling, by Thin Specs hot rolled strip send into runout table, by the pinch roll of runout table by Thin Specs hot rolled strip send into coiling machine.
Furthermore it is preferred that mode be: batch in the process forming drum hot rolled coil the Thin Specs hot rolled strip after carrying out section cooling is carried out, by coiling machine, Thin Specs hot rolled strip batched.
Utilize above-mentioned, flux-cored wire steel making method based on ESP line provided by the invention, by utilizing ESP line directly molten steel to be carried out continuous casting and rolling, thus steps such as " continuous casting → strand post bake → roughing → finish rolling → section cooling → batch → pickling → cold rolling → annealing " that substitutes in conventional processes, and then energy resource consumption can be reduced, meanwhile, substitute in the way of cold-rolled strip produces flux-cored wire steel by hot rolled coil and can reduce cold rolling link, improve recovery rate of iron, reduce production cost.
In order to realize above-mentioned and relevant purpose, one or more aspects of the present invention include the feature that will be explained in below and be particularly pointed out in the claims.Description below and accompanying drawing describe some illustrative aspects of the present invention in detail. But, some modes in the various modes that only can use principles of the invention of these aspects instruction. Additionally, it is contemplated that include all these aspects and their equivalent.
Accompanying drawing explanation
By the content of the reference explanation below in conjunction with accompanying drawing and claims, and along with being more fully understood from the present invention, other purpose of the present invention and result will be more apparent and should be readily appreciated that. In the accompanying drawings:
Fig. 1 is the flux-cored wire steel making method flow schematic diagram based on ESP line according to embodiments of the present invention;
Fig. 2 is the structural representation of brake type Duckbill type soaking water gap.
Label identical in all of the figs indicates similar or corresponding feature or function.
In figure, mouth of a river sidewall 1, bottom 2, endoporus 3, opening 31, opening 32, pod apertures 311, pod apertures 321.
Detailed description of the invention
Below with reference to accompanying drawing, specific embodiments of the invention are described in detail.
ESP (EndlessStripProduction, strip steel without a head produces) line, it it is sheet billet continuous casting and rolling production line of new generation newly-built for A Weidi, owing to its casting speed reaches as high as 7m/min, one is watered and time can produce a whole piece steel band, centre does not have any cutting head cutting tail, thus there is Total continuity strip steel and produce, wall scroll continuous casting line can reach big, the production-line technique low with wide flat steel and quality strip steel, conversion cost from molten steel to hot rolled coil of outstanding production capacity, large-scale production and arrange the features such as the compactest.
In order to the manufacture method producing flux-cored wire steel based on ESP line provided by the invention is described, Fig. 1 illustrates the manufacture method flow process producing flux-cored wire steel based on ESP line according to embodiments of the present invention; Fig. 2 illustrates the structure of brake type Duckbill type soaking water gap.
As it is shown in figure 1, the flux-cored wire steel making method based on ESP line provided by the invention includes:
S110: steel-making stage: form molten steel successively after desulfurization, converter smelting, refine and vacuum circulation degassing by blast-melted.
Specifically, it is possible to use desulfurizer (such as KR desulfurizer) carries out desulfurization by blast-melted, blast-melted then through after the operations such as converter smelting, refine and vacuum circulation degassing after desulfurization, ultimately form molten steel.
The S120:ESP continuous casting and rolling stage: based on ESP line, the molten steel that the steel-making stage is formed is carried out continuous casting and rolling and form Thin Specs hot rolled strip, wherein, in the ESP continuous casting and rolling stage, by adopting non-sinusoidal oscillation of mould pattern and brake type Duckbill type soaking water gap to control the Temperature Distribution of the frictional force between crystallizer and green shell and molten steel in mold, and pass through mould electromagnetic brake, bending section with wick-containing pressure, segmental arc with aligning, horizontal segment, after once cooling and cooling twice, molten steel is carried out continuous casting and forms continuous casting billet, it is intermediate blank by roughing mill by continuous casting billet milling, process through high-pressure water descaling after intermediate blank is carried out electromagnetic induction heating, and by finishing mill, the intermediate blank after process is rolled into Thin Specs hot rolled strip completely without head, wherein, brake type Duckbill type soaking water gap is that circumference offers some pod apertures on the mouth of a river sidewall of endoporus tangential direction.
Specifically, shown in Fig. 2, in the ESP continuous casting and rolling stage, molten steel initially enters in brake type Duckbill type soaking water gap, in brake type Duckbill type soaking water gap, on the mouth of a river sidewall of endoporus tangential direction, circumference offers pod apertures, when molten steel injects, by pod apertures can effective brake molten steel inject time mold liquid level produce fluctuation, make the uniformity of temperature profile of molten steel in mold, avoid causing slag in casting process, thus improving the quality of continuous casting billet.
Wherein, as in figure 2 it is shown, brake type Duckbill type soaking water gap is by mouth of a river sidewall 1, bottom 2, and the endoporus 3 of top end opening that mouth of a river sidewall surrounds with bottom forms.Wherein, mouth of a river sidewall 1 and bottom Integral design, endoporus 3, in Duckbill type, including opening 31 and opening 32, is respectively arranged with downward-sloping pod apertures 311 and pod apertures 321 on the sidewall of opening 31 and opening 32. The centrage of pod apertures 311 and pod apertures 321 is all parallel with the line of centres between opening 31 and opening 32, and pod apertures 311 is provided with the oblique angle extended out that stream stock can be made to produce identical direction of rotation with the exit of pod apertures 321.
Molten steel overheat can be quickly derived by this brake type Duckbill type soaking water gap; stablize the consumption of covering slag; to form uniform slag film; the oblique angle extended out that stream stock produces identical direction of rotation that enables by arranging in pod apertures exit cuts stream stock simultaneously; the rising kinetic energy of decay stream stock; so that stream stock slowly arrives near mold liquid level, so that liquid level fluctuation of crystallizer is stable.
In addition; force green shell to produce inside flexural deformation and cause oscillation mark owing to the pressure of crystallizer menisci place liquid flux film increases in negative slip process; owing to the geometry of oscillation mark, microscopic structure and alloying component etc. are all discontinuous; this easily brings out strand and produces defect; therefore; in the present invention; adopt non-sinusoidal oscillation pattern; by changing vibration velocity distribution; the time being in negative slip during mold oscillation is made to shorten; thus reducing the deformation that green shell causes because of protected slag road pressure, depth of chatter mark is promoted to shoal. By adopting non-sinusoidal oscillation pattern and brake type Duckbill type soaking water gap can effectively control the Temperature Distribution of the frictional force between crystallizer and green shell and molten steel in mold, thus laying the first stone for casting high-quality strand.
Additionally, owing to producing continuously of molten steel to hot rolled coil needs could realize when stably reaching high pulling rate, and for high pulling rate (i.e. high flow capacity, usual common casting machine generally can only achieve about 5m/min), traditional thin-slab caster is difficult to reach, it is impossible to realize high pulling rate and full endless rolling. The present invention adopts the bending section with wick-containing pressure and the segmental arc with aligning in ESP line, high pulling rate (reaching as high as 7m/min) can be realized, ferrostatic pressure can be kept as non-normally low, the quality of continuous casting billet can be greatly improved, meanwhile, one is watered and time can produce " a whole piece steel band ", and centre does not have any crop and back-end crop, strand waste can be reduced, save production cost.
In addition, in order to avoid the fluctuation that crystallizer flow field and crystallizer meniscus are caused by high pulling rate, by adopting electromagnetic braking the molten steel in crystallizer can be applied extraneous magnetic field, thus affecting the flow trace of molten steel, to keep crystallizer flow fields pattern and to maintain stablizing of crystallizer meniscus, thus controlling the formation at conticaster upper area of the initial solidification of continuous casting billet and green shell reliably, and then guarantee the operational stability being issued to height at high pulling rate, indirectly to promote the quality of continuous casting billet.
By mould electromagnetic brake, the bending section with wick-containing pressure, the segmental arc with aligning, horizontal segment, after once cooling and cooling twice, molten steel is carried out continuous casting, after forming continuous casting billet, continuous casting billet enters HRM (HighReductionMill, high reduction mill), it is intermediate blank by HRM by continuous casting billet milling; Then pass through IHF (InductiveHeaterFurnace, induction heater) ensure the surface temperature of intermediate blank, intermediate blank scale on surface is carried out high-pressure water descaling process simultaneously, intermediate blank after high pressure descaling processes carries out, into finishing mill, by finishing mill, completely without head, the intermediate blank after high-pressure water descaling being rolled into Thin Specs hot rolled strip.Wherein, between finishing stand, Hydraulic Looper device it is provided with, it is possible to make hot rolled coil carry out constant-tension rolling, thus ensureing the rolling accuracy of hot rolled coil.
Calibrator and width gage are set after finishing mill, thickness and the width of hot rolled coil can be measured and show by calibrator and width gage; Meanwhile, calibrator and width gage also coordinate with the control system of finishing mill, roll shifting and bending system, such that it is able to improve hot rolled coil longitudinal size precision and reduce hot rolled coil strip steel transverse gage tolerance. It is demonstrated experimentally that by means of the invention it is possible to thickness deviation is controlled within 5 microns.
S130: cooling stage: the Thin Specs hot rolled strip that the ESP continuous casting and rolling stage is formed is carried out section cooling.
Specifically, Thin Specs hot rolled strip is sent into runout table, by the pinch roll of runout table, Thin Specs hot-rolled steel is sent into coiling machine. Wherein, process Thin Specs hot-rolled steel being sent into runout table is the process realizing that Thin Specs hot rolled strip carries out section cooling.
S140: coil ing one: undertaken batching formation drum hot rolled coil by the Thin Specs hot rolled strip after carrying out section cooling.
Wherein, by coiling machine, Thin Specs hot rolled strip is batched, and then form drum hot rolled coil.
S150: pickling stages: the drum hot rolled coil batched by coil ing one carries out pickling.
S160: smooth rewinding stage: the hot rolled coil after pickling is carried out smooth and rewinding acquisition flux-cored wire steel.
Further, after the hot rolled coil after pickling is carried out smooth and rewinding acquisition flux-cored wire steel, also include that flux-cored wire steel is rolled volume successively and be sampled, check, pack and put in storage.
By above-mentioned flow process it can be seen that the thickness of the flux-cored wire steel rolled by the present invention is at 0.6mm～1.0mm. Through it is experimentally confirmed that the thinnest rolling specs that the present invention is capable of at present is 0.8mm, Breadth Maximum is 1600mm. Compared with traditional flow process producing flux-cored wire steel, the present invention passes through ESP line directly to continuous casting of molten steel tandem rolling, from without again strand being carried out post bake, batch, product can be made directly to roll off the production line warehouse-in without then through cold rolling and annealing process after pickling. Therefore, the present invention has faster and higher adaptability, and also product can be made to obtain higher quality.
It should be noted that, it is that base material produces owing to the mode of production of existing flux-cored wire steel is all employing cold-rolled strip, flux-cored wire steel can be obtained need to sequentially pass through hot rolled coil pickling, cold rolling, annealing and the operation such as smooth when producing cold-rolled strip after, and the present invention is based on ESP line, the hot rolled coil obtained in the ESP continuous casting and rolling stage is after overpickling peace is whole, directly obtain flux-cored wire steel, this not only reduces the step producing flux-cored wire steel, and cost is lower than the existing cost utilizing cold-rolled strip to produce flux-cored wire steel for base material.
Specifically, the method have the advantages that
1, directly molten steel is carried out continuous casting and rolling by then passing through ESP line, therefore can at high temperature strike while the iron is hot, make full use of the energy of continuous casting billet high temperature, big drafts is produced by relatively low roll-force, this is compared with conventional hot continuous rolling machine machine, the quantity of heating furnace can be reduced, so that being substantially reduced the consumption of energy;
2, roll under high temperature, it is possible to improve the uniformity of the microstructure of product, make the index performance of product be greatly improved;
3, whole ESP line from continuous casting to finished product coiling machine less than 200 meters, compact conformation, it is possible to reduce cost put into;
4, utilizing ESP line continuous casting, it is possible to achieve completely without head tandem rolling, directly molten steel is become Thin Specs hot rolled coil, product recovery rate is high, and cost is low. The hot rolled coil of rolling can directly for user, and in product specification less than 2mm, ratio is not less than 56%, and when Breadth Maximum is 1600mm, the hot rolled coil that the employing present invention rolls also replaces the cold-rolled products of above-mentioned specification.
5, owing to the roll line length of the present invention is short, therefore can reduce the growing amount of iron scale, reduce the pollution of dephosphorization water, reduce greenhouse gas emission, be conducive to environmental conservation;
6, the product produced by the present invention can cover the complete series steel grade scopes such as low carbon mild steel series, IF steel, middle carbon series, low-alloy high-strength series, dual phase steel, weathering steel, electrical sheet, pipe line steel.
The flux-cored wire steel making method based on ESP line according to the present invention is described in an illustrative manner above with reference to accompanying drawing. It will be understood by those skilled in the art, however, that for the proposed flux-cored wire steel making method based on ESP line of the invention described above, it is also possible on without departing from the basis of present invention, make various improvement. Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (7)
1. based on the flux-cored wire of an ESP line steel making method, including:
The steel-making stage: form molten steel successively after desulfurization, converter smelting, refine and vacuum circulation degassing by blast-melted;
The ESP continuous casting and rolling stage: based on ESP line, the molten steel that the described steel-making stage is formed is carried out continuous casting and rolling, form Thin Specs hot rolled strip; Wherein, in the described ESP continuous casting and rolling stage,
By adopting non-sinusoidal oscillation pattern and brake type Duckbill type soaking water gap to control the Temperature Distribution of the frictional force between crystallizer and green shell and molten steel in mold, and pass through mould electromagnetic brake, bending section with wick-containing pressure, and the segmental arc with aligning, horizontal segment, after once cooling and cooling twice, described molten steel is carried out continuous casting and forms continuous casting billet, it is intermediate blank by roughing mill by described continuous casting billet milling, after described intermediate blank carries out electromagnetic induction heating, high-pressure water descaling processes, and by finishing mill, the intermediate blank after high-pressure water descaling processes is rolled into Thin Specs hot rolled strip completely without head, wherein,
The endoporus of described brake type Duckbill type soaking water gap includes two openings, is respectively arranged with downward-sloping pod apertures on the sidewall of each opening;
Cooling stage: the Thin Specs hot rolled strip that the described ESP continuous casting and rolling stage is formed is carried out section cooling;
Coil ing one: undertaken batching formation drum hot rolled coil by the Thin Specs hot rolled strip after carrying out section cooling;
Pickling stages: the drum hot rolled coil batched by described coil ing one carries out pickling;
The smooth rewinding stage: the hot rolled coil after pickling is carried out smooth and rewinding acquisition flux-cored wire steel.
2. the flux-cored wire steel making method based on ESP line as claimed in claim 1, wherein, the thickness that the molten steel that the described steel-making stage is formed carries out the Thin Specs hot rolled strip that continuous casting and rolling is formed based on ESP line is 0.6mm～1.0mm.
3. the flux-cored wire steel making method based on ESP line as claimed in claim 2, wherein, the thickness that the molten steel that the described steel-making stage is formed carries out the Thin Specs hot rolled strip that continuous casting and rolling is formed based on ESP line is 0.8mm.
4. the flux-cored wire steel making method based on ESP line as claimed in claim 1, wherein, after the hot rolled coil after pickling carries out smooth and rewinding acquisition flux-cored wire steel, also include successively described flux-cored wire steel hot rolled coil is sampled, checks, packs and is put in storage.
5. the flux-cored wire steel making method based on ESP line as claimed in claim 1, wherein, by mould electromagnetic brake, the bending section with wick-containing pressure and the segmental arc with aligning, horizontal segment, after once cooling and cooling twice, after described molten steel is carried out continuous casting formation continuous casting billet
Described continuous casting billet enters HRM and carries out roughing, is intermediate blank by described HRM by described continuous casting billet milling;
Ensured the surface temperature of described intermediate blank by IHF, described intermediate blank scale on surface is carried out high-pressure water descaling process simultaneously;
Intermediate blank after high-pressure water descaling processes enters finishing mill, by described finishing mill, the intermediate blank after high-pressure water descaling becomes after the full endless rolling of finishing mill Thin Specs hot rolled strip.
6. the flux-cored wire steel making method based on ESP line as claimed in claim 1, wherein, in the process that the Thin Specs hot rolled strip that the described ESP continuous casting and rolling stage is formed is carried out section cooling,
Described Thin Specs hot rolled strip is sent into runout table, by the pinch roll of runout table, described Thin Specs hot rolled strip is sent into coiling machine.
7. the flux-cored wire steel making method based on ESP line as claimed in claim 6, wherein, is being undertaken batching in the process forming drum hot rolled coil by the Thin Specs hot rolled strip after carrying out section cooling,
By coiling machine, described Thin Specs hot rolled strip is batched.
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| CN108127093A (en) * | 2017-12-21 | 2018-06-08 | 武汉钢铁有限公司 | The method for eliminating non-oriented electromagnetic steel sheet volume surface chromatic aberration defect |
| CN108251737A (en) * | 2018-02-23 | 2018-07-06 | 柳州钢铁股份有限公司 | A kind of manufacturing method of yield strength 550MPa grade high-strength weathering steels |
| CN109834112A (en) * | 2019-02-26 | 2019-06-04 | 江苏飞达环保科技有限公司 | A kind of cut deal casting and rolling the production line |
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