CN110899331B - Control method of iron oxide powder on surface of hot rolled plate - Google Patents
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000843 powder Substances 0.000 title claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 238000003860 storage Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 10
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 abstract description 11
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910017135 Fe—O Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229910052840 fayalite Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a control method of iron oxide powder on the surface of a hot rolled plate, which is characterized in that after a plate blank with the Si content lower than 0.2 percent is put into a furnace, the heating time is less than 180 minutes under the requirement of the tapping temperature of 1180-1220 ℃; after multi-pass descaling, rolling the heated plate blank by adopting a 'finish rolling high-temperature fast rolling' strategy of which the finish rolling temperature target is 880-900 ℃ and the rolling speed is more than 6 m/s in the finish rolling stage; taking out the finish-rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 560-640 ℃ through laminar flow cooling; and cooling the steel coil, wherein the cooling time is more than 48 hours, and the cooling speed is 20-30 ℃/hour. Compared with the prior art, the method of the invention is used for controlling the surface of the hot rolled plate, the surface of the steel plate has no powder removal phenomenon in the subsequent processing process, the surface is smooth, and the thickness of the iron scale on the surface of the hot rolled plate is controlled to be 5-9 μm.
Description
Technical Field
The invention belongs to the field of hot continuous rolling and steel rolling, and particularly relates to a control method of iron oxide powder on the surface of a hot rolled plate.
Background
In the flattening process of the hot rolled plate, iron oxide scales on the surface are gradually pulverized under the action of a straightening machine to form iron oxide powder which is distributed on the surface of the steel plate, and the pulverized iron oxide scales can be adhered to a straightening roller of the straightening machine under the mixing of grease and water to cause the defect of pit filling on the surface of the strip steel; iron oxide powder attached to the surface of the steel plate deteriorates the working environment, and particularly in summer, a large amount of various fans are used, and the iron oxide powder is blown up and is mixed in the air to fly with the wind, so that the iron oxide powder harms the physical health of staff; a large amount of iron oxide powder that steel sheet surface adheres to causes very big harm to subsequent punching press, the process of spraying paint, because iron oxide powder piles up in a large number in the machining tool very easily, has reduced the clearance of processing grinding apparatus, causes a large amount of waste products to produce, in order to clear away these iron oxide powder in time, need pay manpower and material resources of starting, greatly reduced production efficiency. Moreover, as the demand of customers increases, the surface quality of the steel plate is improved, and the improvement becomes an important aspect of the product competitiveness.
Application number 201810003351.6 disclosed in 2018, 7, 10.8.8.A method for preventing hot-rolled pickling-free automobile beam steel scale from being peeled off in powder form introduces a hot-rolled iron oxide powder control process, the method adopts a medium-Si component design, Si in the component range is subjected to extremely strong selective oxidation in the heating process, a remarkable 'pinning' effect is formed on the surface of a steel plate, the subsequent surface coating and surface finish are influenced, and the method is contrary to the high surface demand of the market mainstream; the cooling of the fan is added in the coiling and cooling process, so that the phase change and dispersion strengthening particle precipitation process still existing in the coiling process is destroyed, and the comprehensive performance of the strip steel is affected in a deterioration way.
Application number 201811065608.7 disclosed in 2019, 1, 18.s.introduces a control idea of iron scale by controlling low-temperature final rolling, laminar flow and controlling the temperature of red return after cooling, and the method has stronger applicable conditions and is mainly used on thick-specification steel plates of a medium plate rolling mill. This technique is not applicable to hot continuous rolling mills.
Disclosure of Invention
The invention aims to provide a control method of iron oxide powder on the surface of a hot rolled plate, which starts from a component system of a steel plate, makes a reasonable heating system, applies a proper rolling process, adopts a rapid cooling process of a finished product warehouse, controls the iron oxide powder on the surface of the hot rolled plate, improves the working environment of workers, improves the surface quality of the steel plate and improves the product competitiveness.
The specific technical scheme of the invention is as follows:
a method for controlling iron oxide powder on the surface of a hot rolled plate is characterized in that the iron oxide powder on the surface of the hot rolled plate is controlled by controlling the low-Si component, and controlling the heating method, the finish rolling temperature, the coiling temperature and the cooling method.
Furthermore, the Si content of the hot rolled plate is limited below 0.2 percent by adopting a low-Si composition design scheme.
Preferably, the hot-rolled plate comprises the following components in percentage by weight: c: 0.045-0.101%, Si: 0.05-0.20%, and Si is not 0.20%, Mn: 1.10-1.81%, P: < 0.015%, S: < 0.008%, Nb: 0.020-0.050%, and the balance of Fe and inevitable impurities.
Preferably, the hot-rolled plate comprises the following components in percentage by weight: c: 0.040-0.085%, Si: 0.02 to 0.10%, Mn: 1.00-1.85%, P: < 0.014%, S: < 0.006%, Nb: 0.03-0.06%, Ti: 0.07 to 0.11%, and the balance of Fe and inevitable impurities.
Preferably, the hot-rolled plate comprises the following components in percentage by weight: c: 0.020 to 0.090%, Si: 0.05-0.15%, Mn: 1.20-1.85%, P: < 0.014%, S: < 0.006%, Nb: 0.03-0.06%, Ti: 0.07 to 0.11%, and the balance of Fe and inevitable impurities.
Preferably, the hot-rolled plate comprises the following components in percentage by weight: c: 0.020 to 0.100%, Si: 0.02-0.20%, and Si is not 0.20%, Mn: 1.00-1.85%, P: < 0.015%, S: < 0.008%, Nb: 0.03-0.06%, Ti: 0.00-0.11%, and the balance of Fe and inevitable impurities.
The control method of the iron oxide powder on the surface of the hot rolled plate also comprises the steps of controlling a heating method, a finish rolling temperature, a coiling temperature and a cooling method in the production process of the hot rolled plate, and specifically comprises the following steps:
1) heating time of less than 180 minutes and heating temperature of 1180-1220 ℃ are adopted;
2) the finish rolling temperature is 880-900 ℃, and the rolling speed is more than 6 m/s;
3) coiling at 560-640 deg.C;
4) the cooling time is more than 48 hours, and the cooling speed is 20-30 ℃/hour.
Further, the coiling temperature was targeted at 600 ℃.
Preferably, the method for controlling the iron oxide powder on the surface of the hot-rolled plate comprises the following steps:
1) after a plate blank with the Si content lower than 0.2% enters a furnace, heating for less than 180 minutes at the tapping temperature of 1180-1220 ℃;
2) the heated plate blank is descaled for multiple times;
3) rolling at a finish rolling stage by adopting a finish rolling temperature target of 880-900 ℃ and a rolling speed of more than 6 m/s;
4) taking out the finish-rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 600 ℃ through laminar flow cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, the steel coil is immediately cooled in the storage area by a cooling fan, the cooling time is more than 48 hours, and the cooling speed is 20-30 ℃/hour.
The design key points of the invention are as follows: adopting a low-Si component design scheme: si can be selectively oxidized in the heating process, and an oxidation origin is preferentially generated on a billet substrate to form Fe2SiO4The structure grows towards a substrate, generates a pinning phenomenon and is difficult to remove in the subsequent descaling process; when the Si content is less than 0.2%, the negative effect on the iron scale can be accepted, so the Si content is limited below 0.2%.
The heating strategy of quick steel burning and low-temperature tapping is adopted: the oxidation degree of steel at high temperature has strong correlation with heating time and heating temperature, and the oxidation degree of steel at high temperature is sharply increased along with the increase of the heating time and the heating temperature, so that Fe enriched on the surface of a steel billet is caused2SiO4The structure increases and remains during the subsequent rolling. Using less than 180 minutes plusThe hot time and the heating temperature of 1180-1220 ℃ reduce the pinning phenomenon of alloy elements and can reduce the thickness of the furnace-generated oxide scale.
Applying a rolling strategy of finish rolling and high-temperature quick rolling:
under the high temperature condition of more than 900 ℃, the surface of the steel billet generates FeO structure, the structure has good extensibility and can be rapidly extended on the surface along with the extension of the steel billet. The stage is at the front stage of finish rolling, so that the thickness of FeO is reduced just after the plate blank passes through a rolling mill, and the thickness of FeO is rapidly increased within the time period of the distance between the two stands. In the finish rolling stage, the thickness of the iron scale on the surface of the billet is circulated in the way to obtain the thickness of the iron scale after finish rolling; the high-temperature softening and extending action of the iron scale is utilized, and a rolling strategy of fast rolling is adopted to control the surface of the iron scale to crack and then continuously grow. The invention improves the finish rolling temperature and speed, namely the finish rolling high-temperature quick rolling can effectively reduce the thickness of the iron scale at the outlet of the finish rolling, and the final rolling temperature is set to 880-900 ℃ and the rolling speed is more than 6 m/s.
Adopting reasonable coiling temperature:
obtained according to a Fe-O phase diagram, 570 ℃ is the eutectoid transformation temperature of FeO, and the eutectoid structure is Fe containing supersaturated elementary Fe3O4Structure; above 570 ℃ is pro-eutectoid Fe3O4Tissue, relatively loose. In order to reduce iron oxide powder on the surface of a hot rolled plate, the coiling temperature combining iron oxide sheet transformation and performance control is adopted, a temperature range of 560-640 ℃ is adopted as a coiling temperature range, and the coiling temperature target is 600 ℃.
In the post-rolling warehouse, a rapid cooling strategy is adopted for cooling the steel coil:
in order to further inhibit the generation of the proeutectoid structure, the coiled steel coil is quickly placed under a cooling fan for cooling for more than 48 hours, and the air cooling speed is 20-30 ℃/hour, so that the final reserved iron scale structure contains FeO and more proeutectoid Fe3O4And partially eutectoid Fe3O4First co-precipitating Fe3O4The content of Fe is about 30-40%, and Fe is eutectoid3O4The content is about 5-10%.
Compared with the prior art, the method of the invention controls the surface of the hot rolled plate by a comprehensive means of air cooling and strip steel cooling after Si component design, short-time quick steel burning, rough rolling pass descaling, high finish rolling temperature and finish rolling speed high-temperature quick rolling, coiling up and down in a eutectoid transformation temperature interval of FeO, and coiling, and the surface of the steel plate has no powder removal phenomenon in the subsequent processing process, has smooth surface and controls the thickness of the iron scale on the surface of the hot rolled plate to be 5-9 mu m.
Drawings
FIG. 1 shows the thickness of scale on the surface of a hot-rolled sheet after treatment in example 1 of the present invention;
FIG. 2 shows the thickness of the scale on the surface of the hot-rolled plate after the treatment of example 2 of the present invention;
FIG. 3 shows the thickness of the scale on the surface of the hot-rolled plate after the treatment of example 3 of the present invention;
FIG. 4 shows the thickness of the scale on the surface of the hot-rolled sheet after the treatment of example 3 of the present invention;
FIG. 5 shows the thickness of the scale on the surface of the hot-rolled sheet treated in comparative example 1 according to the present invention.
Detailed Description
The production process of the hot rolled plate comprises the following steps: after a plate blank with the Si content lower than 0.2% enters a furnace, heating for less than 180 minutes at the tapping temperature of 1180-1220 ℃; after multi-pass descaling, rolling the heated plate blank by adopting a 'finish rolling high-temperature fast rolling' strategy of which the finish rolling temperature target is 880-900 ℃ and the rolling speed is more than 6 m/s in the finish rolling stage; taking out the finish-rolled strip steel, quickly cooling the strip steel to a coiling temperature of 560-640 ℃ through laminar flow cooling; and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled in the storage area by a cooling fan.
Example 1
A control method of iron oxide powder on the surface of a hot rolled plate comprises the following steps:
the hot rolled plate comprises the following components in percentage by weight: c: 0.087%, Si: 0.18%, Mn: 1.362%, P: 0.0125%, S: 0.006%, Nb: 0.024%, and the balance of Fe and inevitable impurities.
The production method of the hot rolled plate comprises the following steps:
1) heating the hot rolled plate blank at the temperature of 1198 ℃ for 167 minutes;
2) 8 descaling the heated plate blank in the whole process;
3) rolling at the finish rolling temperature of 884 ℃ and the minimum rolling speed of F7 of 6.3 m/s in the finish rolling stage;
4) taking out the finish rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 617 ℃ through laminar cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled for 50.2 hours in the storage area by a cooling fan at an air cooling speed of 24.3 ℃/hour.
The above control method resulted in a product having a gauge of 8 x 1500mm, the hot rolled plate surface having a scale thickness as shown in FIG. 1, measured at 5.102 μm, 8.888 μm and 5.245 μm, respectively.
Example 2
A control method of iron oxide powder on the surface of a hot rolled plate comprises the following steps:
the hot rolled plate comprises the following components in percentage by weight: c: 0.065%, Si: 0.08%, Mn: 1.71%, P: 0.0113%, S: 0.003%, Nb: 0.050%, Ti: 0.103%, and the balance of Fe and inevitable impurities.
The production method of the hot rolled plate comprises the following steps:
1) the heating temperature of the hot rolled plate blank is 1213 ℃, and the heating time is 173 minutes;
2) carrying out 7 descaling steps on the heated plate blank;
3) rolling at the finish rolling temperature of 890 ℃ and the F7 rolling speed of 6.4 m/s at the lowest in the finish rolling stage;
4) the strip steel after finish rolling is discharged, is rapidly cooled to a target coiling temperature of 607 ℃ through laminar cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled for 58.5 hours in the storage area by a cooling fan at an air cooling speed of 26.1 ℃/hour.
The specification of the product obtained by the control method is 8 x 1340 mm. The surface scale thicknesses of the hot rolled plate were as shown in FIG. 2, and the measured thicknesses were 7.28. mu.m, 7.52. mu.m, and 8.51. mu.m, respectively.
Example 3
A control method of iron oxide powder on the surface of a hot rolled plate comprises the following steps:
the hot rolled plate comprises the following components in percentage by weight: c: 0.068%, Si: 0.12%, Mn: 1.74%, P: 0.0103%, S: 0.0025%, Nb: 0.055%, Ti: 0.098%, and the balance of Fe and inevitable impurities.
The production method of the hot rolled plate comprises the following steps:
1) heating at 1208 ℃ for 169 minutes;
2) carrying out 9 descaling steps on the heated plate blank;
3) rolling at the finishing temperature of 895 ℃ and the lowest rolling speed of F7 of 6.2 m/s in the finishing rolling stage;
4) discharging the finish rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 626 ℃ through laminar flow cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled for 52.6 hours in the storage area by a cooling fan at an air cooling speed of 22.8 ℃/hour.
The product obtained by the above control method has a specification of 8 x 1450mm, the thickness of the scale on the surface of the hot rolled plate is shown in FIG. 3, and the measured thicknesses are 6.850 μm, 6.411 μm and 6.848 μm, respectively.
Example 4
A control method of iron oxide powder on the surface of a hot rolled plate comprises the following steps:
the hot rolled plate comprises the following components in percentage by weight: c: 0.058%, Si: 0.11%, Mn: 1.46%, P: 0.0105%, S: 0.005%, Nb: 0.042%, Ti: 0.015% and the balance Fe and inevitable impurities.
The production method of the hot rolled plate comprises the following steps:
1) heating to 1197 deg.c for 178 min;
2) carrying out 9 descaling steps on the heated plate blank;
3) rolling at the finishing temperature of 899 ℃ and the lowest rolling speed of F7 of 6.8 m/s in the finishing rolling stage;
4) taking out the finish rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 601 ℃ through laminar flow cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled for 58.3 hours in the storage area by a cooling fan at an air cooling speed of 20.5 ℃/hour.
The product specification obtained by the above control method is 8 x 1650mm, the thickness of the scale on the surface of the hot rolled plate is shown in figure 4, and the measured thicknesses are 7.139 μm, 8.456 μm and 6.704 μm respectively.
Comparative example 1
A control method of iron oxide powder on the surface of a hot rolled plate comprises the following steps:
the hot rolled plate comprises the following components in percentage by weight: c: 0.062%, Si: 0.27%, Mn: 1.36%, P: 0.0125%, S: 0.005%, Nb: 0.044%, Ti: 0.018%, and the balance of Fe and inevitable impurities.
The production method of the hot rolled plate comprises the following steps:
1) the heating temperature is 1227 ℃, and the heating time is 228 minutes;
2) carrying out 9 descaling steps on the heated plate blank;
3) rolling at the finishing temperature of 896 ℃ and the lowest rolling speed of F7 of 4.4 m/s in the finishing rolling stage;
4) taking out the finish rolled strip steel, quickly cooling the strip steel to the target coiling temperature of 611 ℃ through laminar flow cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, and the steel coil is immediately cooled for 58.3 hours in the storage area by a cooling fan at the air cooling speed of 21.5 ℃/hour.
The product specification obtained by the above control method was 8 x 1650mm, the thickness of the scale on the surface of the hot rolled plate was as shown in fig. 5, and the measured thicknesses were 11.5 μm, 11.7 μm and 12.5 μm, respectively.
Claims (3)
1. A method for controlling iron oxide powder on the surface of a hot-rolled sheet, characterized in that the method controls the iron oxide powder on the surface of the hot-rolled sheet by controlling the low-Si component, the heating method, the finish rolling temperature, the coiling temperature, and the cooling method, and the hot-rolled sheet C: 0.045-0.101%, Si: 0.05-0.20%, and Si is not 0.20%, Mn: 1.10-1.81%, P: < 0.015%, S: < 0.008%, Nb: 0.020-0.050% and the balance of Fe and inevitable impurities;
the control method comprises the following steps of hot rolled plate production:
1) heating time of less than 180 minutes and heating temperature of 1180-1220 ℃ are adopted;
2) the finish rolling temperature is 880-900 ℃, and the rolling speed is more than 6 m/s;
3) coiling at 560-640 deg.C;
4) the cooling time is more than 48 hours, and the cooling speed is 20-30 ℃/hour;
the produced hot rolled plate iron scale structure contains FeO and more pro-eutectoid Fe3O4And partially eutectoid Fe3O4First co-precipitating Fe3O430-40% of Fe by weight, and co-precipitating Fe3O4The content accounts for 5-10%;
the thickness of the iron scale on the surface of the hot-rolled plate is controlled to be 5-9 mu m.
2. The control method according to claim 1, characterized in that the coiling temperature target is 600 ℃.
3. The control method according to claim 1, characterized in that the control method is:
1) after a plate blank with the Si content lower than 0.2% enters a furnace, heating for less than 180 minutes at the tapping temperature of 1180-1220 ℃;
2) the heated plate blank is descaled for multiple times;
3) rolling at a finish rolling stage by adopting a finish rolling temperature target of 880-900 ℃ and a rolling speed of more than 6 m/s;
4) taking out the finish-rolled strip steel, quickly cooling the strip steel to a target coiling temperature of 560-640 ℃ through laminar flow cooling;
5) and the steel coil out of the coiling machine reaches a finished product storage area through a conveying line, the steel coil is immediately cooled in the storage area by a cooling fan, the cooling time is more than 48 hours, and the cooling speed is 20-30 ℃/hour.
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| CN107904502B (en) * | 2017-11-23 | 2019-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | 610MPa grades of automotive frame hot rolled steel plates and its production method |
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