CN103862248A - Method for effectively preventing generation of head and tail surface defects in hot rolling process - Google Patents
Method for effectively preventing generation of head and tail surface defects in hot rolling process Download PDFInfo
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- CN103862248A CN103862248A CN201410103136.5A CN201410103136A CN103862248A CN 103862248 A CN103862248 A CN 103862248A CN 201410103136 A CN201410103136 A CN 201410103136A CN 103862248 A CN103862248 A CN 103862248A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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Abstract
The invention provides a method for effectively preventing the generation of head and tail surface defects in the hot rolling process, and belongs to the technical field of roll steel rolling. According to the method, right-angle edges, crossed with the upper and lower surfaces, of cut surfaces of continuous casting blanks are removed, the casting blank trimming surfaces after the right-angle edge removal are in a polyhedral shape or a curve surface shape, and the occurrence of obvious burrs needs to be avoided. The right-angle edge removal mode is an off-line or on-line processing mode adopting grinding wheel grinding, flame cutting or hydraulic hot shearing and the like, the included angle of every two adjacent surfaces of the trimming surface is greater than 110 degrees, and the longest distance between the trimming surface and the edge of the original right-angle edge is controlled to be within a range being 5mm to 70mm. The method has the advantages that the large-range surface defects at the heads and the tails of hot rolled coils or intermediate blanks caused in the blank casting aspect in the continuous casting blank hot rolling process can be reduced or even eliminated, and the head and tail removal quantity is reduced by more than 90 percent on the precise of ensuring the identical head and tail quality, so the roll steel yield is improved, and the unit production cost of hot rolled coils can be reduced.
Description
Technical field
The invention belongs to steel rolling rolling technical field, particularly a kind of effective prevention course of hot rolling method that blemish produces end to end, by transformation continuous casting billet end to end section configuration with prevention hot rolling blemish end to end.
Background technology
Steel rolling hot rolled coil end to end surface quality defect, because generation is frequent, is difficult for location and removes on hot rolled coil, very large on downstream client use and brand names impact.In order to improve hot rolled coil quality end to end, promote downstream client's lumber recovery, iron and steel enterprise's customary practice is exactly, in roughing operation, intermediate blank is respectively excised to 100mm-200mm left and right end to end, i.e. total amount excision 200mm-400mm, excision amount accounts for total amount 0.5%-1%.This serious steel rolling process lumber recovery that reduces, causes steel enterprise hot rolled coil process cost to raise.Along with steel market market continued downturn, each big steel enterprise operation pressure continues to increase, and deepens continuously and excavates the means of cost efficiency.Each operation is under the high pressure of cost economic indicator, and in order to reach the performance assessment criteria of expection, intermediate blank excision system is end to end carried out not strict, so that affects hot rolled coil quality end to end, jeopardizes downstream client's interests.
Although it is ripe that endless rolling or semi-endless rolled technology have become, high product line construction cost or scrap build expense make iron and steel enterprise hang back.Therefore, under existing equipment and technical conditions, reduce as far as possible intermediate blank excision amount end to end, lifting hot rolled coil end to end quality is metallargist, comprises the problem that whole industry need to conscientiously be studied.
Summary of the invention
The object of the present invention is to provide a kind of effective prevention course of hot rolling method that blemish produces end to end, by the poor right-angled edge removal of thermoplasticity that strand cutting section is caused greatly due to temperature drop, effectively reduce the strand thermograde on surface end to end, avoid casting blank section right-angled edge to depress greatly under power collision and form blemish source in roughing operation, stop the generation of blemish end to end of this class from source.
Foundation of the present invention is based on to hot-rolled intermediate billet, hot rolled coil and cold rolling coil scrutinizing of surface defect form, classification, generation type and scope end to end.It is as described below that such blemish forms principle:
Rolling flow process: strand enter heating furnace → strand go out heating furnace → high-pressure water descaling → roughing (containing cooling) → crop end → finish rolling (containing cooling) → laminar flow cooling → batch.
In production process, to control continuous casting billet roughing start rolling temperature as important indicator, normal steels is 1050 ℃～1150 ℃ as cold rolling material (as SPHC), carbon structural steel (as Q235), low-alloy structural steel (as Q345) and pipe line steel (as X65) etc. all require strand start rolling temperature.And the right-angled edge that goes out strand cutting section after heating furnace is because heat loss is large, matrix thermal compensation is slow, and in the time of roughing open rolling, temperature is compared with the low 200 ℃ of left and right of casting billet surface, and right-angled edge surface temperature is 800 ℃～950 ℃, and this temperature range is in material fragility interval.Due to right-angled edge and inside steel billet thermograde large, material at high temperature thermoplasticity difference is large, causes right-angled edge to crack source under the large deformation pressure of roughing mill; Because right-angled edge temperature is lower, poorer with respect to the part metals ductility that other temperature are higher, under the rolling of milling train, right-angled edge part is directly pressed into matrix inside simultaneously.After milling train multi-pass is depressed, if do not cut intermediate blank end to end, such defect will be along with metal constantly slippage and extending in the follow-up operation of rolling, finally form discrete imperfect tape (defect is that iron scale is pressed into, pit, peeling etc. in surface end to end at hot rolled coil, cover hot rolled coil end to end several meters of length even tens meters not etc., defect mainly concentrates on strip edge edge in 1/4 width range, and central area is less).
The present invention adopts following technical scheme:
Right-angled edge crossing with upper and lower surface continuous casting billet cutting section is removed, and the strand reconditioning face after right-angled edge is removed is Polyhedral or curved surface shaped, can not have obvious burr to occur.
Described right-angled edge removing method is for adopting off-line or the online processing modes such as grinder buffing, flame cutting or hydrothermality shearing.
The each adjacently situated surfaces angle of described reconditioning face is greater than 110 °.
Described reconditioning face is controlled within the scope of 5mm～70mm with the seamed edge longest distance of original right-angled edge.
The present invention's tool compared with existing control technology has the following advantages:
1, can alleviate and even eliminate the intermediate blank or the hot rolled coil broad surface defect end to end that in continuous casting billet hot rolling process, cause due to strand aspect, to optimize intermediate blank or hot rolled coil excision amount end to end, guaranteeing under the equal prerequisite of surface quality end to end, excision amount end to end reduces more than 90%, improve Rolling Yield, reduce the hot rolled coil unit cost of production.
2, can greatly improve intermediate blank surface quality end to end, prevent that blemish heredity to hot rolled coil, cold rolling coil from going up end to end, cause defective effect scope to increase exponentially, affect brand prestige.
Accompanying drawing explanation
Fig. 1 is traditional casting blank shape schematic diagram.
Fig. 2 is a kind of strand of the present invention sectional schematic diagram end to end.
Fig. 3 is another kind of strand of the present invention sectional schematic diagram end to end.
The specific embodiment
Embodiment 1
In order to verify that the present invention is to the product preventive effect of blemish end to end, after continuous casting billet ejection, be cooled to normal temperature, select 10 200mm thickness strands to compare test, with walking voluntarily flame cutting easy device, four right-angled edges of strand cutting section are cut away, cut surface and right-angled edge distance H are 25-30mm, have cleared up and have sent heater for rolling steel heating after cutting burr.Rolling flow process: strand enter heating furnace → strand go out heating furnace → mono-time high-pressure water descaling → secondary high-pressure water de-scaling → roughing (containing cooling) → crop end → finish rolling (containing cooling) → laminar flow cooling → batch.
Roughing adopts single chassis 5 passages, and depressing from strand original depth to every time, intermediate blank desired value thickness is followed successively by: 200mm → 140mm → 103mm → 72mm → 47mm → 32mm, final hot rolled coil target thickness is 3.0mm.For the convenient test effect that characterizes, with follow the tracks of the cold rolling rear final products of downstream client end to end blemish (rise rubber-insulated wire, iron scale are pressed into, pit etc.) excision amount measure.As shown in table 1, the present invention tests obviously (as listed in scheme in table 1 5) of base resultant effect, significantly reduces under precondition in intermediate blank excision amount end to end, and after cold rolling, final products are rolled up the excision amount causing because of blemish problem end to end and sharply reduced.Strand, intermediate blank and downstream client's final products excision amount are carried out to Comprehensive Correlation, and the present invention is to improving product lumber recovery successful.
The each testing program entirety of table 1 removal amount test effect contrast table
Finally explanation, above embodiment is only unrestricted so that technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can carry out the modification in parameter area or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (1)
1. one kind is effectively prevented the course of hot rolling method that blemish produces end to end, it is characterized in that: right-angled edge crossing with upper and lower surface continuous casting billet cutting section is removed, strand reconditioning face after right-angled edge is removed is Polyhedral or curved surface shaped, can not have obvious burr to occur;
Right-angled edge removing method adopts grinder buffing, flame cutting or hydrothermality cut mode off-line or processes online;
Described reconditioning face is controlled within the scope of 5mm～70mm with the seamed edge longest distance of original right-angled edge; Reconditioning face is greater than 110 ° with each adjacently situated surfaces angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410103136.5A CN103862248A (en) | 2014-03-19 | 2014-03-19 | Method for effectively preventing generation of head and tail surface defects in hot rolling process |
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| CN201410103136.5A CN103862248A (en) | 2014-03-19 | 2014-03-19 | Method for effectively preventing generation of head and tail surface defects in hot rolling process |
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| CN103862248A true CN103862248A (en) | 2014-06-18 |
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| CN201410103136.5A Pending CN103862248A (en) | 2014-03-19 | 2014-03-19 | Method for effectively preventing generation of head and tail surface defects in hot rolling process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848214A (en) * | 2018-12-27 | 2019-06-07 | 西南铝业（集团）有限责任公司 | A kind of blank and rolled plate manufacture craft |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN113984998A (en) * | 2021-10-28 | 2022-01-28 | 苏州热工研究院有限公司 | Method for testing sufficiency of head and tail cutting of steel ingot for nuclear power heat transfer pipe |
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| JP2002224702A (en) * | 2000-11-30 | 2002-08-13 | Kawasaki Steel Corp | Method of manufacturing stainless steel plate |
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| EP1870172A1 (en) * | 2005-03-28 | 2007-12-26 | Angang Steel Company Limited | A continuous casting and rolling method for medium plate |
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2014
- 2014-03-19 CN CN201410103136.5A patent/CN103862248A/en active Pending
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| JP2002224702A (en) * | 2000-11-30 | 2002-08-13 | Kawasaki Steel Corp | Method of manufacturing stainless steel plate |
| EP1870172A1 (en) * | 2005-03-28 | 2007-12-26 | Angang Steel Company Limited | A continuous casting and rolling method for medium plate |
| EP1792668A1 (en) * | 2005-12-01 | 2007-06-06 | Sapa Heat Transfer | Method for reducing shearing and crop losses at rolling of assembled slabs |
| CN200998764Y (en) * | 2007-02-15 | 2008-01-02 | 宝山钢铁股份有限公司 | Continuous casting crystallizer |
| CN201702334U (en) * | 2010-05-28 | 2011-01-12 | 精美铝业有限公司 | Crystallizer for casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848214A (en) * | 2018-12-27 | 2019-06-07 | 西南铝业（集团）有限责任公司 | A kind of blank and rolled plate manufacture craft |
| CN112893467A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN113984998A (en) * | 2021-10-28 | 2022-01-28 | 苏州热工研究院有限公司 | Method for testing sufficiency of head and tail cutting of steel ingot for nuclear power heat transfer pipe |
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Application publication date: 20140618 |