CN101336305A

CN101336305A - Production method of steel band suitable for antioxidation surface coating

Info

Publication number: CN101336305A
Application number: CNA2006800518160A
Authority: CN
Inventors: 乔瓦尼·阿尔维迪
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2008-12-31
Also published as: JP2009524526A; WO2007086085A1; AU2006336815A1; CA2636546A1; US20100242558A1; BRPI0621257A2

Abstract

A process is described for producing steel strips suitable for receiving a surface coating which is resisting to oxidation, in particular tin plating, of medium productivity, that does not require for its execution plants extended of a large areas or involving high economical investments. It comprises, starting from pickled hot strips having a thickness > 0.7 mm, preferably obtained from thin-slab plants, a single cold rolling step by passing through not more than three stands of the Sendzimir 6Zhi type for the cold reduction of thickness to less than 0.25 mm and subsequent annealing. It is possible to obtain final thicknesses < 0.18 mm both by simple reduction, which only provides subsequent skin-passing and finishing steps, and by double reduction on half-raw strip, which provides subsequent passes for thickness reduction of 30%.

Description

Be suitable for the production method of the steel band of antioxidation surface coating

Technical field

The present invention relates to by using anti-oxidant element such as aluminium, chromium or nickel, copper etc. and being applicable to the method for the steel band of accepting antioxidation surface coating especially for the tin manufacturing of producing tinplate (tin-plate).As known,, adopt heat treating method when adopting electrolysis process or possibility in order to deposit above-mentioned coating metal.

Background technology

Such high productivity, main equipment is known, sizable area of these equipment claimed and heavy investment, and the equipment of students with moderate performance productive rate (about 200000 tons/year) provides effectively alternative, this equipment is suitable for the equipment combination with small-sized steel mill type, the present invention just is being aimed at this technology, rather than be directed to the equipment of known type and relevant high-yield method, utilize the general production method of band acquisition tinplate as follows: from having the hot rolled band of about 2mm thickness, reach final thickness by two different cold rolling steps then, the two one of be to adopt large-scale " Gao Si (High Four) " tandem milling train with 4-5 frame, form a line with pickling line, outside production line, as patent GB 1,027,495 is disclosed, but still have the frame of same type and number.It is 0.14-0.18mm so that make band reach final thickness before zinc-plated after annealing that second cold rolling step occurs in " Gao Si " type that utilizes 2-3 frame.Such equipment signal is presented among Fig. 1, and as described, its major limitation is a limitation of size, because it occupies very big area, therefore makes cost of investment high especially.

In fact using hot rolled band is favourable as the parent material of tinplate production, and described hot rolled band for example is the hot rolled band that preferred (even non-exclusively) obtains by system (as the inventor's the described system of international publication application NO.WO2004/026497) in the thin slab type production line.The sketch of this endless rolling system is shown among Fig. 2, wherein as can be seen in the downstream of casting region: first roughing (roughing) that have continuous casting (a) that the liquid core depresses, is located immediately at the continuous casting outlet (b), induction heater (c), finishing mill (e) and base substrate rapid cooling zone (f) afterwards, " Abrollhaspel " type strip coiler (g).Adopt such equipment in fact to obtain to have the ultrathin hot rolled band of 0.7-1mm rather than 2mm thickness, therefore make that subsequent process steps is simpler and more do not bother, particularly the final thickness of requirement acquisition 0.14-0.18mm is cold rolling, as the band of preparing to be used for surface-coated is desired, to become for example tinplate.Yet if adopt the cold rolling frame of " Gao Si " type according to prior art, just as mentioned above, the shortcoming relevant with cost with high investment with needing big area can only reduce and can not overcome.

Summary of the invention

Therefore the purpose of this invention is to provide the ultra-thin strip technology of students with moderate performance productive rate, this ultra-thin strip is suitable for accepting antioxidation surface coating, and this technology need not occupying big area and relating in the equipment of cost with high investment and carrying out.

Utilization has that the production craft step of listed step has obtained this purpose of the present invention in the claim 1.

Description of drawings

From the following detailed description of reference accompanying drawing, will be clearer according to other purpose of the present invention, advantage and feature, wherein:

Fig. 1 has illustrated to show the part and relevant processing step of high productivity equipment that is used to obtain to prepare to carry out the steel band of surface-coated according to prior art mentioned above;

Fig. 2 has illustrated to show especially according to above-mentioned WO2004/026497 production " thin slab " equipment as the hot rolled band of the parent material of subsequent technique; With

Fig. 3 has illustrated to show the equipment that is used to implement the inventive method, in the downstream of " thin slab " type equipment of foundation Fig. 2.

Embodiment

According to the present invention, as indicated above, as the top coat substrate, be preferred for producing the band of tinplate, be the thick ultrathin hot rolled band of 0.7-1.0mm, from illustrate the thin slab equipment acquisition of shown type as Fig. 2.

With reference to figure 3, illustrate according to method of the present invention, in the steps downstream that the hot rolled band with expectation thickness as noted above is produced, this hot rolled band is obtained by the method and apparatus of for example Fig. 2.Band with 0.7-1.0mm thickness is sent to after pickling in the Sendzimir 6Zhi type cold-rolling mill, particularly adopt the cold-rolling mill of three frames as shown in the figure, this cold-rolling mill is very compact and therefore need occupy the comparatively area of reduction, thereby has limited cost of investment.Adopt described cold rolling step, make thickness of strip reach the end value of expectation, band stands without a head or batch annealing and skin-pass thereafter, and is back to same cold-rolling mill.

It should be noted that to be different from high four type frames, the Sendzimir frame is more compact and allow more significant draught, because littler roll is used for this effect, contacts thus that cross section is reduced and for the power that applies of identical value, specific pressure is higher.In contrast, prior art has been used (though having adopted corresponding method) equipment as Fig. 1, and wherein hot rolls has a plurality of high four tandem type frames.Its reason is to hint the technology prejudice that should not adopt the Sendzimir frame, because their the contact mode cross section that reduces, they will increase rather than reduce the geometrical defect of band, as the defective of parallelism aspect.Therefore the preferred remarkable bigger contact cross section that is provided by large diameter processing roll that uses, this roll typical case is the high four tandem type frames that allow to correct the hot rolled band defective.This is unfavorable to the area of investment burden and equipment installation needs certainly.

Consider use according to the present invention and thin slab equipment at foundation Fig. 2 in produce initial hot rolled band the time, such technology prejudice will be eliminated fully, be characterised in that to have less than the utmost point regular geometric profile of 0.3% protruding rate or convexity and the thickness deviation suitable, have the yardstick, the cold-rolled products that reduce with these, as shown in the table.

Still with reference to figure 3, also note that the method for the present invention of utilizing, can use Senzimir 6Zhi milling train with 3 frames, once more from having the hot rolled band of 0.7 to 1.0mm thickness, cold rolling after 0.14-0.18mm, annealing and skin-pass with simple compression direct production SR type tinplate band, half original (half-raw) or produce the described band of DR type when depressing for twice, preferably be cold-rolled to thickness is 0.20-0.25mm (but non-special), annealing also is compressed to≤thickness of 0.18mm draught about 30% thereafter.

Claims

1. be suitable for accepting the particularly production method of the steel band of tin coating of antioxidation surface coating, it is characterized in that comprising: from having the pickling hot rolled band of thickness 〉=0.7mm, the single cold rolling step that passes no more than three Sendzimir 6Zhi type frames is in order to colding pressing thickness down to less than 0.25mm, and subsequent annealing steps.

2. according to the method for claim 1, it is characterized in that in order to produce SR (simply depressing) band it is cold rolling up to reaching≤thickness of 0.18mm to implement Sendzimir 6Zhi type, and skin-pass and finishing step are only arranged after the described annealing steps.

3. according to the method for claim 1, it is characterized in that in order to produce DR (twice depress) type half original band, the described Sendzimir 6Zhi of original adoption type cold rolling step is up to the thickness that reaches 0.20 to 0.25mm, then when annealing by about 30% depress, be less than the one-tenth-value thickness 1/10 of 0.18mm.

4. according to each method of aforementioned claim, wherein initial hot rolled band obtains by thin slab equipment.