CN109226259A - A method of improving hot rolling pipeline steel oxidation iron sheet integrality - Google Patents
A method of improving hot rolling pipeline steel oxidation iron sheet integrality Download PDFInfo
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- CN109226259A CN109226259A CN201811065608.7A CN201811065608A CN109226259A CN 109226259 A CN109226259 A CN 109226259A CN 201811065608 A CN201811065608 A CN 201811065608A CN 109226259 A CN109226259 A CN 109226259A
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- scaling
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- iron sheet
- cooling
- hot rolling
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Classifications
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
Abstract
The invention discloses a kind of methods for improving hot rolling pipeline steel oxidation iron sheet integrality, and this method comprises the following steps: (1) heating；(2) just de-scaling；(3) single chassis rolls, and operation roll of mill uses high ferrochrome roll；(4) roughing, the 1st and the 2nd uses the water de-scaling of milling train fuselage, pressure >=22Mpa of de-scaling water when roughing；(5) finish rolling, intermediate base carry out finish rolling after temperature, and start rolling temperature control is at 980 ± 10 DEG C, and finishing temperature control is at 820 ± 10 DEG C, finish rolling extreme trace reduction in pass≤15%；(6) flying shear；(7) cooling, it is cooling using layer flow mode；(8) aligning, finishing；(9) it examines, storage.Steel oxidation iron sheet integrality made from this method is good, corrosion-resistant strong.
Description
Technical field
The present invention relates to the production method of hot rolling pipeline steel oxidation iron sheet, in particular to a kind of raising hot rolling pipeline steel oxidation
The method of iron sheet integrality.
Background technique
Currently, the means of transportation of steel mill's pipe line steel outlet is mainly transported by sea, generally require 1-2 months, and reaches system
It also needs to store after pipe factory several months, in the meantime, steel plate, which gets rusty easily, causes mark to fall off, and some even will appear
Local corrosion causes steel plate thickness to cause to scrap beyond the margin of tolerance.The steel in storage and transportational process is improved in the prior art
There are mainly two types of methods for the corrosion resistance of plate: one is brush corrosion-inhibiting coatings, since clear stipulaties do not allow brush applied coating in API standard,
Along with manufacturing cost is increased, so seldom application；Second method is to improve the quality of hot rolling iron scale, by hindering oxygen
The method of contact with iron matrix improves corrosion resistance.This method is due to road work after hardly increasing manufacturing cost and not influencing
Sequence is favored by more and more steel mills, but due to generally requiring to control cold strong aligning by force in pipeline steel making processes, thus to
It is difficult that control obtains complete iron scale.
It is entitled " a kind of corrosion proof using iron scale raising hot rolled steel plate application No. is CN201210461252.5
Method ", the finishing temperature of involved steel grade and final cooling temperature are higher in this method, differ too with existing pipe line steel production technology
Greatly, it is not easy to realize.Application No. is CN103962386A, a kind of entitled " the corrosion proof iron scale of raising hot rolled steel plate
Control method ", this method propose that controlling the cooling speed of upper cold bed reaches iron oxide leather block by controlling the eutectoid reaction degree of FeO
The reasonable control of structure, but the integrality of final iron scale is undesirable.
Summary of the invention
Goal of the invention: it is an object of the present invention to provide a kind of method for improving hot rolling pipeline steel oxidation iron sheet integrality, the party
Method can be improved hot rolling pipeline steel oxidation iron sheet and keep preferable integrality in strong cold and straightening process, improve subsequent storage and object
The corrosion resistance on stream process light plate surface.
Technical solution: the present invention provides a kind of method for improving hot rolling pipeline steel oxidation iron sheet integrality, including walks as follows
It is rapid:
(1) it heats, slab heating temperature≤1170 DEG C, heating time 250-320min；
(2) just de-scaling, pressure >=22Mpa of first de-scaling high pressure water；
(3) single chassis rolls, and operation roll of mill uses high ferrochrome roll, and the weight of chromium degree of high ferrochrome is
15%-20%, roll surface hardness >=75HSD, axially and radially working lining difference of hardness≤1.5HSD；
(4) roughing, the 1st and the 2nd uses the water de-scaling of milling train fuselage, pressure >=22Mpa of de-scaling water when roughing；
(5) finish rolling, intermediate base carry out finish rolling after temperature, and start rolling temperature is controlled at 980 ± 10 DEG C, to guarantee final iron oxide
Skin thickness is 12-15 microns, and in order to make finished product plate have good low temperature block hammer performance, finishing temperature control is 820
± 10 DEG C, wherein finish rolling extreme trace reduction in pass≤15%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, whole cold red temperature≤500 DEG C cooling using layer flow mode；
(8) aligning, finishing；
(9) it examines, storage.
Further, the weight percent content of Ni is 0.2%≤Ni≤0.5% in step (1) slab.
Further, in step (5) in finishing stands on the basis of the 1st and 2 dephosphorization, increase by 2nd entrance reciprocal
De-scaling.
Further, step (7) the section cooling nozzle is U-typed collector, nozzle exit pressure 0.2Mpa.
Further, finishing includes scale trimming in the step (8), and surface defect checks reconditioning and sampling, further includes
The step of other inspections need.The aligning steel plate bad to template after cooling is aligned in the step (8).
The present invention be arranged above-mentioned steps and parameter main foundation and reason is that
(1) why the present invention limits the additive amount of Ni, mainly in view of Ni is to later period scale structure
With the influence of adhesive force.Ni is a kind of more dysoxidizable element in steel, and in high-temperature heating, Fe is preferentially reacted with O, and Ni can
Enrichment forms metal twine in iron scale, the plasticity and toughness of iron scale is improved, so even if in section cooling mistake
It is not easily broken in journey and also and falls off in straightening process.The content of Ni is in just when the enrichment of the Ni in iron scale and the smelting of matrix
It is found than, the present invention by system test, when the weight percent content of Ni >=0.2%, does not influence finish rolling scale removal effect,
But in cooling and straightening process iron scale adhesive force be improved significantly, as Ni > 0.5%, iron scale is in essence
The defects of removal difficulty for rolling process can obviously increase, and will cause iron scale indentation.Therefore, the present invention in Ni weight percent
It controls than content in 0.2%≤Ni≤0.5%.
(2) institute of the present invention controls slab heating temperature at 1170 DEG C hereinafter, mainly considering heating temperature to matrix
With the influence at iron scale interface.When 1170 DEG C of heating temperature >, the internal oxidition of matrix side is obviously reinforced near interface,
The especially oxidation of crystal boundary, these internal oxiditions stretch to the feeler of matrix like iron scale, greatly strengthen iron scale
Adhesive force be easy to cause de-scaling not to the utmost.Moreover, subsequent increased 2nd de-scaling temperature reciprocal is relatively low (840 DEG C of general <),
The removal difficulty of iron scale increases, given once oxidation iron sheet forms internal oxidition pinning, three be subsequently formed in heating process
Secondary iron scale is difficult to remove increasing de-scaling passage, also will form de-scaling band.So heating and temperature control is existed
1170 DEG C or less.
(3) operation roll of mill of the present invention uses high ferrochrome roll, mainly for increasing the thickness uniformity of iron scale.It is high
Ferrochrome surface forms M7C3 carbide, and this Carbide Phases are more coarse than traditional MC carbide, and roll can be guaranteed in heat
Good surface roughness is kept during rolling, reduces the inhomogeneous deformation defect of iron scale；
(4) finish rolling extreme trace reduction in pass is reduced, template on the one hand can be improved, reduces subsequent aligning to iron scale
Destruction；On the other hand, with the reduction of extreme trace time rolling temperature, plasticity and the toughness decline of iron scale, big deformation
Amount be easy to cause iron scale locally broken, forms red scale or iron scale falls off.It is demonstrated experimentally that when finish rolling end
Road reduction in pass≤15%, finished product plate template and iron scale are preferable.
(5) de-scaling of finishing pass 1 and 2 mainly completely removes intermediate base and waits for temperature iron scale generated, and increase is fallen
Number the 2nd is the thickness in order to control iron scale.It is demonstrated experimentally that template can be seriously affected by increasing inverse the 1st, and can shadow
Finishing temperature is rung, causes performance unstable；Increase inverse the 3rd or other passages, iron scale thickness is blocked up will cause after
It cracks and falls off in continuous cooling and straightening process；And increase the 2nd de-scaling reciprocal, not only smaller to the influence of finishing temperature, mechanics
Performance is stablized, and final iron scale thickness can control at 12-15 microns, and iron scale has good plasticity, toughness
And corrosion resistance.
(6) cooling by the way of section cooling after rolling mainly to consider the nozzle with pressure (>=1Mpa) to iron scale
With destruction, and laminar flow, mainly by the gravity of water itself, the influence to iron scale is smaller.
The utility model has the advantages that the present invention can have good by the thickness control of finished product plate iron scale in 12-15 microns
Plasticity, toughness, can guarantee not fracture and flake off in cooling and straightening process, make iron scale in subsequent handling
It is not destroyed, ensure that the corrosion resistance in later period, be conducive to improve product quality in kind, remarkable in economical benefits；Furthermore, it is not necessary that volume
Outer increase equipment carries out scrap build, easy to implement.
Detailed description of the invention
Fig. 1 be iron scale fall off region percentages calculate intercept method schematic diagram.
Specific embodiment
Embodiment 1
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1170 DEG C of slab heating temperature, heating time 320min, the weight percent content of Ni in slab
It is 0.5%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.4HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2,4, and intermediate base carries out finish rolling, open rolling temperature after temperature
Degree control is at 990 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 830 DEG C, wherein finish rolling extreme trace reduction in pass 13.4%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Embodiment 2
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1150 DEG C of slab heating temperature, heating time 250min, the weight percent content of Ni in slab
It is 0.5%；
(2) just de-scaling, the pressure 23Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 16% of high ferrochrome,
Roll surface hardness 77HSD, axially and radially working lining difference of hardness 14HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 23Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2,4, and intermediate base carries out finish rolling, open rolling temperature after temperature
Degree control is at 980 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 820 DEG C, wherein finish rolling extreme trace reduction in pass 13.6%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 490 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Embodiment 3
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1163 DEG C of slab heating temperature, heating time 280min, the weight percent content of Ni in slab
It is 0.43%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 20% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2,4, and intermediate base carries out finish rolling, open rolling temperature after temperature
Degree control is at 970 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 810 DEG C, wherein finish rolling extreme trace reduction in pass 15%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold red temperature≤500 DEG C, section cooling nozzle are U-typed collector eventually,
Nozzle exit pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Embodiment 4
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1143 DEG C of slab heating temperature, heating time 320min, the weight percent content of Ni in slab
It is 0.43%；
(2) just de-scaling, the pressure 24Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 16% of high ferrochrome,
Roll surface hardness 76HSD, axially and radially working lining difference of hardness 1.2HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2,4, and intermediate base carries out finish rolling, open rolling temperature after temperature
Degree control is at 990 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 820 DEG C, wherein finish rolling extreme trace reduction in pass 14.4%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 485 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Embodiment 5
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1147 DEG C of slab heating temperature, heating time 250min, the weight percent content of Ni in slab
It is 0.2%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 77HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2,4, and intermediate base carries out finish rolling, open rolling temperature after temperature
Degree control is at 985 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 825 DEG C, wherein finish rolling extreme trace reduction in pass 14.1%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 468 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Embodiment 6
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1154 DEG C of slab heating temperature, heating time 260min, the weight percent content of Ni in slab
It is 0.2%；
(2) just de-scaling, the pressure 23Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 16% of high ferrochrome,
Roll surface hardness 76HSD, axially and radially working lining difference of hardness 1.4HSD；
(4) roughing, roughing passage are 7, and dephosphorization passage is the 1st, 2,4, and the 1st and the 2nd uses milling train when roughing
Fuselage water de-scaling, the pressure 22Mpa of de-scaling water；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 980 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 820 DEG C, wherein finish rolling extreme trace reduction in pass 12.5%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 1
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1163 DEG C of slab heating temperature, heating time 250min, the weight percent content of Ni in slab
It is 0.01%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 990 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 830 DEG C, wherein finish rolling extreme trace reduction in pass 13.5%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 2
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1157 DEG C of slab heating temperature, heating time 320min, the weight percent content of Ni in slab
It is 0.89%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 970 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 810 DEG C, wherein finish rolling extreme trace reduction in pass 13.5%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 3
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1189 DEG C of slab heating temperature, heating time 250-320min, the weight percent of Ni in slab
Content is 0.5%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 990 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 810 DEG C, wherein finish rolling extreme trace reduction in pass 14.6%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 4
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1165 DEG C of slab heating temperature, heating time 320min, the weight percent content of Ni in slab
It is 0.5%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis rolls, and operation roll of mill uses chromium nickel roll, and roll surface hardness 75HSD axially and radially works
Layer difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 980 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 820 DEG C, wherein finish rolling extreme trace reduction in pass 14.7%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 5
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1167 DEG C of slab heating temperature, heating time 250min, the weight percent content of Ni in slab
It is 0.43%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 970 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 810 DEG C, wherein finish rolling extreme trace reduction in pass 18.7%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold red temperature≤500 DEG C, section cooling nozzle are U-typed collector eventually,
Nozzle exit pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 6
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1165 DEG C of slab heating temperature, heating time 250min, the weight percent content of Ni in slab
It is 0.43%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is the 1st, 2, and intermediate base carries out finish rolling, start rolling temperature control after temperature
System is at 970 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate that there is good low temperature to drop hammer
Performance, finishing temperature control is at 810 DEG C, wherein finish rolling extreme trace reduction in pass 14.8%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using layer flow mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector, spray
Mouth pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Comparative example 7
The method of the raising hot rolling pipeline steel oxidation iron sheet integrality of the present embodiment, includes the following steps:
(1) it heats, 1160 DEG C of slab heating temperature, heating time 320min, the weight percent content of Ni in slab
It is 0.2%；
(2) just de-scaling, the pressure 22Mpa of first de-scaling high pressure water；
(3) single chassis roll, operation roll of mill use high ferrochrome roll, the weight of chromium degree 15% of high ferrochrome,
Roll surface hardness 75HSD, axially and radially working lining difference of hardness 1.5HSD；
(4) roughing, roughing passage are 7, and the 1st and the 2nd uses the water de-scaling of milling train fuselage, the pressure of de-scaling water when roughing
Power 22Mpa；
(5) finish rolling, finishing pass are 5, and dephosphorization passage is that base carries out finish rolling, open rolling temperature after temperature among the 1st, 2,4
Degree control is at 985 DEG C, to guarantee final iron scale with a thickness of 12-15 microns, in order to make finished product plate have good low temperature
Block hammer performance, finishing temperature control is at 825 DEG C, wherein finish rolling extreme trace reduction in pass 14.4%；
(6) flying shear, the long rolled piece after refining require sub-cut at section according to size；
(7) cooling, cooling using ultrafast cold mode, cold 500 DEG C of red temperature eventually, section cooling nozzle is U-typed collector,
Nozzle exit pressure is 0.2Mpa；
(8) aligning, finishing are aligned the steel plate bad to template after cooling and are aligned.Finishing includes scale trimming, surface
Defect inspection reconditioning and sampling further include the steps that other inspections need；
(9) it examines, storage.
Performance test:
The integrality of iron scale is first clapped whole plate with high definition camera by the region percentages calculation that falls off of iron scale
According to then being fallen off area percentage on photo using intercept method calculating, transversal position calculates at plate factory 1/4,1/2 and 3/4
Formula is (a+b+c)/3w, as shown in Figure 1, wherein wherein L1, L2 and L3 are transversal, and s1, s2 and s3 are iron scale obscission zone
Domain, a, b and c are respectively the zone length that falls off that L1, L2 and L3 are intercepted, and w is the wide length of plate.As the area percentage < 5% that falls off
When, iron scale integrality is judged as preferably, when >=5%, iron scale integrality be then it is poor, test result is shown in Table 1:
1 the performance test results of table
| Number | Iron scale integrality |
| Embodiment 1 | Preferably |
| Embodiment 2 | Preferably |
| Embodiment 3 | Preferably |
| Embodiment 4 | Preferably |
| Embodiment 5 | Preferably |
| Embodiment 6 | Preferably |
| Comparative example 1 | It is poor |
| Comparative example 2 | It is poor |
| Comparative example 3 | It is poor |
| Comparative example 4 | It is poor |
| Comparative example 5 | It is poor |
| Comparative example 6 | It is poor |
| Comparative example 7 | It is poor |
As it can be seen from table 1 embodiment 1-6 technique and step meet technical solution of the present invention, surface of steel plate iron oxide
Leatherware has a preferable integrality, and comparative example 1-7 is respectively to Ni content, heating temperature, roll material, finish rolling extreme trace drafts,
Finish rolling de-scaling passage, the type of cooling are limited to the complete of the external Study on Steel plate surface iron scale of technical solution of the present invention
Property, steel surface iron oxide scale falls off seriously as the result is shown, has poor integrality, illustrates that technical solution of the present invention has
More prominent effect.
Claims (8)
1. a kind of method for improving hot rolling pipeline steel oxidation iron sheet integrality, characterized by the following steps:
(1) it heats, slab heating temperature≤1170 DEG C, heating time 250-320min；
(2) just de-scaling, pressure >=22Mpa of first de-scaling high pressure water；
(3) single chassis rolls, and operation roll of mill uses high ferrochrome roll, and the weight of chromium degree of high ferrochrome is 15%-
20%, roll surface hardness >=75HSD, axially and radially working lining difference of hardness≤1.5HSD；
(4) roughing, the 1st and the 2nd uses the water de-scaling of milling train fuselage, pressure >=22Mpa of de-scaling water when roughing；
(5) finish rolling, intermediate base carry out finish rolling after temperature, start rolling temperature control at 980 ± 10 DEG C, finishing temperature control 820 ±
10 DEG C, finish rolling extreme trace reduction in pass≤15%；
(6) long rolled piece after refining is required sub-cut at section by flying shear according to size；
(7) cooling, whole cold red temperature≤500 DEG C cooling using layer flow mode；
(8) aligning, finishing；
(9) it examines, storage.
2. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly the weight percent content of Ni is 0.2%≤Ni≤0.5% in (1) slab.
3. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly roughing passage is 7 in (4).
4. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly finishing pass is 5 in (5).
5. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly in (5) in finishing stands on the basis of the 1st and 2 dephosphorization, increase by 2nd entrance de-scaling reciprocal.
6. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly section cooling with nozzle is U-typed collector, nozzle exit pressure 0.2Mpa in (7).
7. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly finishing includes scale trimming in (8), and surface defect checks reconditioning and sampling.
8. the method according to claim 1 for improving hot rolling pipeline steel oxidation iron sheet integrality, it is characterised in that: the step
Suddenly the aligning steel plate bad to template after cooling is aligned in (8).
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| CN111593182A (en) * | 2019-11-26 | 2020-08-28 | 北京特冶工贸有限责任公司 | Production method of corrosion-resistant Baima complex phase structure steel rail |
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