CN103537640B - A kind of thin strap continuous casting exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling - Google Patents

A kind of thin strap continuous casting exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling Download PDF

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CN103537640B
CN103537640B CN201310489332.6A CN201310489332A CN103537640B CN 103537640 B CN103537640 B CN 103537640B CN 201310489332 A CN201310489332 A CN 201310489332A CN 103537640 B CN103537640 B CN 103537640B
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strip
rolling
reduction
cast
reduced anneal
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CN103537640A (en
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刘振宇
曹光明
李成刚
何永全
王国栋
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Northeastern University China
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Northeastern University China
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Abstract

The invention belongs to technical field of material metallurgy, be specifically related to a kind of thin strap continuous casting exempts from acid-cleaning plate method in conjunction with reduced anneal production hot rolling.Concrete steps first obtain refined molten steel, prepares roll casting sheet, carries out reduced anneal, first remove cast-rolling thin strip scale on surface at reduction section after carrying out hot-leveling to cast-rolling thin strip uncoiling, adopts H 2atmospheric condition protection reduction, reduction temperature is 800-1100 DEG C, recovery time 10-30min; H is adopted in high annealing section 2and N 2atmosphere protection, reduction temperature is 500-1000 DEG C, recovery time 1-5min, and the structure and properties realizing strip controls, and obtains Thin Strip Steel product.Cast-rolling thin strip is exempted from the annealing of pickling direct-reduction by technical scheme of the present invention, save cold-rolling pickling operation, simultaneously can the company of fully phasing out move back before pre-oxidation operation, to greatly improve the continuity of strip production technology, while enhancing productivity, just also reduce production cost reduce the pollutant emissions such as spent acid, produce huge economic benefit and social benefit.

Description

A kind of thin strap continuous casting exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling
Technical field
The invention belongs to technical field of material metallurgy, be specifically related to a kind of thin strap continuous casting exempts from acid-cleaning plate method in conjunction with reduced anneal production hot rolling.
Background technology
In recent decades, domestic and international iron and steel circle always round saving the energy, enhance productivity, development new technologies of improving production quality, with reach long-term and constantly save the energy put forward high-quality object.Strip continuous casting technology is as direct pouring going out the important new technology that shape, size and quality are continuous-casting art most potentiality as far as possible close to the near net shape casting technology of final products, but the removal for the iron scale produced in casting process is a generally acknowledged difficult problem, normally adopts the mode of pickling to remove always; But, along with country unprecedentedly strengthens the dynamics of punishing that spent acid discharges, the requirement of the energy consumption index of ferrous materials following process is improved further, if carry out hot rolled plate to exempt from the annealing of pickling direct-reduction, cold-rolling pickling operation can be saved, will greatly improve hot rolling-Lian and move back the continuity of production technology.
Pohang Iron and Steel Corporation of Korea S is to the H of iron scale 2reduced anneal technique is studied, and from structure control and the zinc-plated work doing part of heat of reduction of iron scale, successfully develops heat of reduction galvanized sheet.Gondola Danieli utilizes reductive annealed oven direct-reduction hot-strip; the surface quality obtaining band steel is even better than acid-cleaning plate; but above-mentioned two production decisions are mainly for traditional hot rolling production procedure; the specification of raw material is thicker; consider that the longer and inert free gas protection of line production procedure is produced in traditional hot rolling, belt steel surface iron scale thickness is thicker, adds the difficulty of subsequent oxidation iron sheet reduction phase; for the removing of the many employing machinery of the iron scale after reduction, production efficiency is low.
Summary of the invention
For prior art Problems existing, little consumption pattern number non-orientation silicon steel height silicon steel 6572 area method, electrophoretic deposition, electro beam physics vapour deposition method, the invention provides a kind of thin strap continuous casting exempts from acid-cleaning plate method in conjunction with reduced anneal production hot rolling, object proposes one to have technique simply, and equipment investment is low, energy consumption is low, the strip minimizing production method cold with the torrid zone that lumber recovery is high.
The technical scheme realizing the object of the invention is carried out according to following steps:
(1) melting, refining:
Prepare burden according to the component ratio of strip, put into smelting furnace and carry out melting, when the liquid steel temperature in smelting furnace is 1500 ~ 1650 DEG C, adds deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1450 ~ 1600 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 10 ~ 80m/min, blanketing with inert gas in the flow process of molten steel, obtaining thickness is the roll casting sheet of 1 ~ 3mm, and strip surface iron scale controls at 3-8 μm;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 800-1100 DEG C, smooth drafts is 30% to the maximum, then batches and naturally cools to normal temperature, obtains the cast-rolling thin strip that plate shape thickness is good;
(4) reduced anneal:
Reduced anneal is carried out to cast-rolling thin strip uncoiling; at reduction section removing cast-rolling thin strip scale on surface; reduction section employing volume fraction is that the nitrogen atmosphere of 15-100% hydrogen and 0-85% carries out protection reduction; reduction temperature is 500-1000 DEG C; recovery time 1-5min; the structure and properties simultaneously realizing strip controls, and obtains exempting from acid-cleaning plate product.
Described inert gas selects argon gas.
Compared with prior art, feature of the present invention and beneficial effect are:
Technical scheme of the present invention refined molten steel is adopted double roll strip casting rolling plant to obtain the roll casting sheet of Cast Strip thickness 1 ~ 3mm, simultaneously realizing protective atmosphere cast in casting process, reduces iron scale thickness (3-8 μm); Reduce the difficulty of sequential reduction iron scale, by reducing atmosphere (H 2) in through reduction reaction removing surface iron scale, reduzate pure iron can improve the wellability of belt steel surface, thus ensure that the good adhesion of coated layer.Thin-belt casting rolling technique belongs to abbreviated system, because cooling velocity in molten steel solidification process is up to 10 2~ 10 5dEG C/s, belong to typical Sub realizable fuzzy matrix, there is the microscopic structure of Uniform Slender crystalline substance.After annealing in process, the brilliant feature of Uniform Slender of tissue has heredity, can improve product high strength and plasticity.Meanwhile, save continuous casting and hot-rolled process, namely eliminate the high energy consumption process of high-temperature heating and hot continuous rolling, technological process is obviously shortened, and energy consumption reduces by more than 50%, and production cost reduces by more than 40%, meets the requirement of energy-saving and emission-reduction.
Cast-rolling thin strip is exempted from the annealing of pickling direct-reduction by technical scheme of the present invention, save cold-rolling pickling operation, simultaneously can the company of fully phasing out move back before pre-oxidation operation, to greatly improve the continuity of strip production technology, while enhancing productivity, just also reduce production cost reduce the pollutant emissions such as spent acid, produce huge economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 is production procedure schematic diagram of the present invention;
Fig. 2 is the roll casting sheet photomacrograph that the embodiment of the present invention 1 strip casting process is produced;
Fig. 3 is the strip macrograph that the embodiment of the present invention 1 strip casting process is produced;
Fig. 4 is the strip iron scale sectional view that the embodiment of the present invention 1 strip casting process is produced;
What Fig. 5 was the embodiment of the present invention 1 through the reduction of reduced anneal process exempts from acid-cleaning plate iron scale sectional view;
Fig. 6 is the strip iron scale sectional view that the embodiment of the present invention 2 strip casting process is produced;
Fig. 7 is the iron scale sectional view of the embodiment of the present invention 2 through the reduction of reduced anneal;
Fig. 8 is that the embodiment of the present invention 2 exempts from the zinc layers sectional view that acid-cleaning plate carries out galvanizing after reduced anneal;
Fig. 9 is that the exempt from acid-cleaning plate of the embodiment of the present invention 2 after reduced anneal carries out photomacrograph figure after galvanizing clod wash.
Detailed description of the invention
Embodiment 1
(1) melting, refining:
According to the component ratio of strip, be C:0.003%, Si:0.03%, Mn:0.22% by weight percentage, Al:0.02%, S:0.004%, P:0.007%, all the other are Fe batching, put into smelting furnace and carry out melting, when the liquid steel temperature in smelting furnace is 1590 DEG C, add deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1550 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 40m/min, default roll gap is 0.9mm, inert gas argon shield is used in the flow process of molten steel, obtaining thickness is the roll casting sheet of 1.1mm, and roll casting sheet scale on surface controls at 3 μm, and its photomacrograph as shown in Figure 2;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 950 DEG C, smooth drafts is 25%, then batches and naturally cools to normal temperature, and obtain the cast-rolling thin strip that plate shape thickness is good, as shown in Figure 3, iron scale sectional view as shown in Figure 4 for its macrograph;
(4) reduced anneal:
Reduced anneal is carried out to cast-rolling thin strip uncoiling, at reduction section removing cast-rolling thin strip scale on surface, adopts 20%H 2and 80%N 2mixed atmosphere is protected; reduction temperature is 700 DEG C; recovery time 3min; the structure and properties realizing strip controls; obtain exempting from acid-cleaning plate product; through the reduction of reduced anneal process strip iron scale sectional view as shown in Figure 5, as can be seen from Fig. 4 and Fig. 5, the strip scale reduction through anacidity reduced anneal obtains very clean.
Embodiment 2
(1) melting, refining:
According to the component ratio of strip, C:0.04%, Si:0.04%, Mn:0.3% by weight percentage, Al:0.025%, S:0.006%, P:0.009%, surplus is Fe batching, puts into smelting furnace and carries out melting, when the liquid steel temperature in smelting furnace is 1560 DEG C, add deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1520 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 25m/min, default roll gap is 2mm, inert gas argon shield is used in the flow process of molten steel, obtaining thickness is the roll casting sheet of 2.1mm, and roll casting sheet scale on surface controls at 7 μm;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 900 DEG C, smooth drafts is 20%, then batches and naturally cools to normal temperature, and obtain the cast-rolling thin strip that plate shape thickness is good, its iron scale sectional view as shown in Figure 6;
(4) reduced anneal:
Carrying out reduced anneal to cast-rolling thin strip uncoiling, at reduction section removing cast-rolling thin strip scale on surface, take volume fraction as 80%H 2and 20%N 2mixed atmosphere is protected; reduction temperature is 900 DEG C; recovery time 8min; the structure and properties realizing strip controls; obtain exempting from acid-cleaning plate product; through the reduction of reduced anneal process strip iron scale sectional view as shown in Figure 7, as can be seen from Fig. 6 and Tu, the strip iron scale through anacidity reduced anneal go reduction very clean.
Galvanizing is carried out to the strip product of the reduction through reduced anneal process, its zinc layers sectional view as shown in Figure 8, the photomacrograph after clod wash as shown in Figure 9, as can be seen from the figure, the Thin Strip Steel body after anacidity reduced anneal and the geometric form of coating good.
Embodiment 3
(1) melting, refining:
According to the component ratio of strip, C:0.004%, Si:2.91%, Mn:0.2% by weight percentage, Al:0.01%, S:0.016%, surplus is Fe batching, puts into smelting furnace and carries out melting, when the liquid steel temperature in smelting furnace is 1650 DEG C, add deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1600 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 10m/min, default roll gap is 2.0 mm, inert gas argon shield is used in the flow process of molten steel, obtaining thickness is the roll casting sheet of 2.1mm, and roll casting sheet scale on surface controls at 7 μm;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 1100 DEG C, smooth drafts is 30%, then batches and naturally cools to normal temperature, obtains the cast-rolling thin strip that plate shape thickness is good;
(4) reduced anneal:
Reduced anneal is carried out to cast-rolling thin strip uncoiling, first removes cast-rolling thin strip scale on surface at reduction section, adopt 100%H 2atmospheric condition protection reduction, reduction temperature is 1000 DEG C, recovery time 5min; The structure and properties realizing strip controls, and obtains exempting from acid-cleaning plate product.
Embodiment 4
(1) melting, refining:
According to the component ratio of strip, C:0.004%, Si:2.91%, Mn:0.2% by weight percentage, Al:0.01%, S:0.016%, surplus is Fe batching, puts into smelting furnace and carries out melting, when the liquid steel temperature in smelting furnace is 1500 DEG C, add deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1450 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 80m/min, default roll gap is 2.0 mm, inert gas argon shield is used in the flow process of molten steel, obtaining thickness is the roll casting sheet of 3mm, and roll casting sheet scale on surface controls at 3 μm;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 800 DEG C, smooth drafts is 30%, then batches and naturally cools to normal temperature, obtains the cast-rolling thin strip that plate shape thickness is good;
(4) reduced anneal:
Reduced anneal is carried out to cast-rolling thin strip uncoiling, first removes cast-rolling thin strip scale on surface at reduction section, adopt volume fraction 15%H 2with the nitrogen atmosphere condition protection reduction of 85%, reduction temperature is 1100 DEG C, recovery time 1min; The structure and properties realizing strip controls, and obtains exempting from acid-cleaning plate product.

Claims (2)

1. thin strap continuous casting exempts from a method for acid-cleaning plate in conjunction with reduced anneal production hot rolling, it is characterized in that carrying out according to following steps:
(1) melting, refining:
Prepare burden according to the component ratio of strip, put into smelting furnace and carry out melting, when the liquid steel temperature in smelting furnace is 1500 ~ 1650 DEG C, adds deslagging agent, then carry out refining, obtain refined molten steel;
(2) roll casting sheet is prepared:
Surface is adopted to have the beryllium copper casting roll of coating protection to carry out dual-roller thin-belt casting rolling to refined molten steel, it is 1450 ~ 1600 DEG C that the opening of refined molten steel waters temperature, roll casting speed is 10 ~ 80m/min, blanketing with inert gas in the flow process of molten steel, obtaining thickness is the roll casting sheet of 1 ~ 3mm, and strip surface iron scale controls at 3-8 μm;
(3) hot-leveling:
Carry out hot-leveling to the roll casting sheet obtained, smooth temperature 800-1100 DEG C, smooth drafts is 30% to the maximum, then batches and naturally cools to normal temperature, obtains the cast-rolling thin strip that plate shape thickness is good;
(4) reduced anneal:
Reduced anneal is carried out to cast-rolling thin strip uncoiling; at reduction section removing cast-rolling thin strip scale on surface; reduction section employing volume fraction is that the nitrogen atmosphere of 15-100% hydrogen and 0-85% carries out protection reduction; reduction temperature is 500-1000 DEG C; recovery time 1-5min; the structure and properties simultaneously realizing strip controls, and obtains Thin Strip Steel product.
2. a kind of thin strap continuous casting according to claim 1 exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling, it is characterized in that argon gas is selected in described inert gas shielding.
CN201310489332.6A 2013-10-18 2013-10-18 A kind of thin strap continuous casting exempts from the method for acid-cleaning plate in conjunction with reduced anneal production hot rolling Active CN103537640B (en)

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CN105200441A (en) * 2014-05-30 2015-12-30 宝山钢铁股份有限公司 Hot-dip coated product with oxide layer and its manufacturing method and use
WO2015180462A1 (en) * 2014-05-30 2015-12-03 宝山钢铁股份有限公司 Method for directly producing pickling-free hot-plated sheet strip product from molten steel
CN105220101B (en) * 2014-05-30 2017-12-26 宝山钢铁股份有限公司 The method for exempting from pickling hot dip sheet band product is directly produced by molten steel
CN105215053B (en) * 2014-05-30 2018-03-30 宝山钢铁股份有限公司 The production method of pickling electroplated product is exempted from hot rolling
CN104498825A (en) * 2014-12-08 2015-04-08 青岛海信电器股份有限公司 Steel plate and manufacturing method thereof, and liquid crystal module
CN107557511A (en) * 2017-08-30 2018-01-09 武汉钢铁有限公司 Thin Strip Steel productive technology of short flow based on DRI

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