CN113600615A - Double-sided composite plate coil hot rolling and rolling process thereof - Google Patents
Double-sided composite plate coil hot rolling and rolling process thereof Download PDFInfo
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- CN113600615A CN113600615A CN202110898043.6A CN202110898043A CN113600615A CN 113600615 A CN113600615 A CN 113600615A CN 202110898043 A CN202110898043 A CN 202110898043A CN 113600615 A CN113600615 A CN 113600615A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 98
- 239000002131 composite material Substances 0.000 title claims abstract description 70
- 238000005098 hot rolling Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 67
- 239000002253 acid Substances 0.000 claims abstract description 24
- 239000010963 304 stainless steel Substances 0.000 claims abstract description 14
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000005422 blasting Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000005554 pickling Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 229910021645 metal ion Inorganic materials 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a double-sided composite plate coil hot rolling and rolling process, wherein the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 20-35%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.07 percent of C, less than or equal to 2 percent of Mn, less than or equal to 10.5 percent of Ni, less than or equal to 0.75 percent of Si, less than or equal to 19.5 percent of Cr, less than or equal to 0.1 percent of N, less than or equal to 1.0 percent of Cu, less than or equal to 0.045 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: less than or equal to 0.24 percent of C, less than or equal to 1.6 percent of Mn, less than or equal to 0.3 percent of Ni, less than or equal to 0.55 percent of Si, less than or equal to 0.3 percent of Cr, less than or equal to 0.01 percent of N, less than or equal to 0.4 percent of Cu, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and inevitable impurities; the process comprises the following steps: 1) preheating; 2) heating; 3) rough rolling; 4) fine rolling; 5) coiling; 6) uncoiling and welding; 7) annealing; 8) performing scale breaking and shot blasting; 9) acid washing; 10) and (5) drying.
Description
Technical Field
The invention belongs to the technical field of double-sided composite plate coils, and particularly relates to hot rolling and a rolling process of a double-sided composite plate coil.
Background
With the rapid development of the country to the industries such as building, water conservancy and hydropower, petrochemical industry and the like, the use of the double-sided composite board roll is gradually increased, the market demand is large, and the requirement on the double-sided composite board roll is also gradually improved; and gaps are easily generated between the composite layers and the base layer in the production and processing process of the composite plate coil, so that the composite plate is wasted, and the production cost is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the double-sided composite plate coil hot rolling and the rolling process thereof, which can meet different requirements of multiple industries on double-sided composite plates, can freely combine the thickness of plates, has high production efficiency, can avoid gaps between a composite layer and a base layer, and reduces the production cost.
In order to achieve the purpose, the invention adopts the technical scheme that:
a double-sided composite plate coil hot rolling and rolling process thereof, the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 20% -35%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.07 percent of C, less than or equal to 2 percent of Mn, less than or equal to 10.5 percent of Ni, less than or equal to 0.75 percent of Si, less than or equal to 19.5 percent of Cr, less than or equal to 0.1 percent of N, less than or equal to 1.0 percent of Cu, less than or equal to 0.045 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: less than or equal to 0.24 percent of C, less than or equal to 1.6 percent of Mn, less than or equal to 0.3 percent of Ni, less than or equal to 0.55 percent of Si, less than or equal to 0.3 percent of Cr, less than or equal to 0.01 percent of N, less than or equal to 0.4 percent of Cu, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and inevitable impurities;
the hot rolling process comprises the following steps:
1) preheating: the double-sided composite board of the raw material components is sent into a heating furnace for preheating, the preheating temperature is adjusted to 690 and 735 ℃, and the heating time is controlled to be 70-80 min;
2) heating: after preheating, heating for a section, adjusting the heating temperature to 1110-1150 ℃, and controlling the heating time to be 30-40 min; after the first heating stage is finished, the second heating stage is carried out, the heating temperature is adjusted to 1255-; after the heating second stage is finished, entering a soaking stage, adjusting the heating temperature to 1270-; the total in-furnace time is controlled to be 180-210 min;
3) rough rolling: after the double-sided composite steel billet is heated in the heating furnace, the double-sided composite steel billet enters a roughing mill for roughing after being descaled by two groups of descaling water; the rough rolling adopts 7-pass rolling, and the one-pass reduction rate is 22-23%; the reduction rate of the second pass is 24-26%; the three-pass reduction rate is 26.5-28%; the four-pass reduction rate is 23-25%; the five-pass reduction rate is 21-24%; the six-pass reduction rate is 20-22%; the reduction rate of seven passes is 18-20%; the rolling speed is 4m/s-5m/s, 1 and 3 times of descaling operation are put into the rough rolling process, the hot rolling box adopts a straight-through mode, and the rough rolling outlet temperature is 1180 +/-20 ℃; the thickness of the intermediate blank after rough rolling is 30-35 mm;
4) finish rolling: after the rough rolling is finished, the double-sided composite billet is sent into a finish rolling device through a transmission roller, the finish rolling adopts the accelerated rolling, the rolling speed is 7m/s-8m/s, the finish rolling opening temperature is controlled to be 1120 +/-10 ℃, and the finish rolling finishing temperature is 1050 +/-30 ℃; performing fine rolling and throwing steam for descaling;
5) coiling: conveying the double-sided composite board coil subjected to finish rolling to a coiling mechanism through a conveying roller for coiling;
6) uncoiling and welding: the two groups of double-sided composite plate steel coils are welded and fixed through the welding device, so that the subsequent processing device can continuously process the steel strip, and the working efficiency is improved;
7) annealing: annealing and cooling the double-sided composite plate coil by an annealing device;
8) scale breaking and shot blasting: performing pulling, straightening, descaling and shot blasting operation on the annealed and cooled double-sided composite plate coil through a scale breaking device and a shot blasting device;
9) acid washing: performing acid pickling treatment on oxide skins formed on the surfaces of the double-sided composite plate coil through an acid pickling mechanism; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the first-stage mixed acid HNO3 is 80 +/-5 g/L, the concentration of HF is 35 +/-5 g/L, the metal ions are less than 40g/L, and the temperature is 55 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 70 +/-5 g/L, the concentration of HF is 30 +/-5 g/L, the metal ions are less than 35g/L, and the temperature is 45 +/-5 ℃;
10) drying: the pickling solution remained on the surface of the steel strip is cleaned through high-pressure water flow of the cleaning mechanism, then the steel strip is dried through the drying device, and then the steel strip is coiled and bundled through the coiling mechanism.
Preferably, the chemical components of the 304 stainless steel in percentage by weight are Ni more than or equal to 8 percent and Cr more than or equal to 17.5 percent.
Compared with the prior art, the invention has the beneficial effects that:
1) the hot rolling and rolling process of the double-sided composite plate coil can be suitable for rolling of a thin plate composite plate, improves the production efficiency of the double-sided composite plate, greatly reduces the gap rate between a compound layer and a base layer, reduces the rejection rate of the composite plate coil, saves the equipment operation space and reduces the production cost of the double-sided composite plate;
2) in the equipment processing and manufacturing process of each industry, the equipment cost can be reduced by using the stainless steel composite board to replace a stainless steel plate, and the stainless steel composite board not only has the characteristics of wear resistance, corrosion resistance, magnetism resistance and the like, but also has the characteristics of weldability, stretchability, heat conductivity and the like, so that the service life of the equipment can be prolonged, the production efficiency of the equipment can be improved, and the operation cost can be reduced.
Detailed Description
In order to facilitate the understanding of those skilled in the art, the technical solution of the present invention is further specifically described below with reference to examples 1 to 3.
Example 1:
a double-sided composite plate coil hot rolling and rolling process thereof, the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 20%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: 0.063% of C, 1.04% of Mn, 8.03% of Ni, 0.45% of Si, 18.05% of Cr, 0.038% of N, 0.049% of Cu, 0.033% of P and 0.01% of S; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: 0.2% of C, 1.3% of Mn, 0.1% of Ni, 0.4% of Si, 0.2% of Cr, 0.003% of N, 0.1% of Cu, 0.03% of P, 0.03% of S, and the balance of Fe and inevitable impurities;
the process comprises the following steps:
1) preheating: feeding the double-sided composite board of the raw material components into a heating furnace for preheating, adjusting the preheating temperature to 702 ℃, and controlling the heating time to 73 min;
2) heating: heating for a period after preheating, adjusting the heating temperature to 1143 ℃, and controlling the heating time to be 32 min; after the first heating stage, the mixture enters a second heating stage, the heating temperature is adjusted to 1260 ℃, and the heating time is controlled to be 50 min; after the second heating stage, the mixture enters a soaking stage, the heating temperature is adjusted to 1270 ℃, and the heating time is controlled to 30 min; the total in-furnace time is controlled to be 185 min;
3) rough rolling: after the double-sided composite steel billet is heated in the heating furnace, the double-sided composite steel billet enters a roughing mill for roughing after being descaled by two groups of descaling water; the rough rolling adopts 7-pass rolling, and the one-pass reduction rate is 22.1%; the reduction rate of the second pass is 24.8 percent; the three-pass reduction rate is 27.9 percent; the four-pass reduction rate is 24.8 percent; the five-pass reduction rate is 23.9 percent; the six-pass reduction rate is 21.4 percent; the reduction rate of seven passes is 19.8 percent; the rolling speed is 4m/s-5m/s, 1 and 3 times of descaling operation are put into the rough rolling process, the hot coil box adopts a straight-through mode, and the rough rolling outlet temperature is 1175 ℃; the thickness of the intermediate blank after rough rolling is 32 mm;
4) finish rolling: after the rough rolling is finished, the double-sided composite billet is sent into a finish rolling device through a transmission roller, the finish rolling adopts the accelerated rolling, the rolling speed is 7m/s-8m/s, the finish rolling starting temperature is controlled to be 1124 ℃, and the finish rolling finishing temperature is 1058 ℃; performing fine rolling and throwing steam for descaling;
5) coiling: conveying the double-sided composite board coil subjected to finish rolling to a coiling mechanism through a conveying roller for coiling;
6) uncoiling and welding: the two groups of double-sided composite plate steel coils are welded and fixed through the welding device, so that the subsequent processing device can continuously process the steel strip, and the working efficiency is improved;
7) annealing: annealing and cooling the double-sided composite plate coil by an annealing device;
8) scale breaking and shot blasting: performing pulling, straightening, descaling and shot blasting operation on the annealed and cooled double-sided composite plate coil through a scale breaking device and a shot blasting device;
9) acid washing: performing acid pickling treatment on oxide skins formed on the surfaces of the double-sided composite plate coil through an acid pickling mechanism; the acid washing process is provided with a mixed acid first section and a mixed acid second section; the concentration of the mixed acid first-stage HNO3 is 82g/L, the concentration of HF is 39g/L, the metal ion is 35/L, and the temperature is 55 ℃; the concentration of the mixed acid second-stage HNO3 is 75g/L, the concentration of HF is 35g/L, the metal ions are 30g/L, and the temperature is 45 ℃;
10) drying: the pickling solution remained on the surface of the steel strip is cleaned through high-pressure water flow of the cleaning mechanism, then the steel strip is dried through the drying device, and then the steel strip is coiled and bundled through the coiling mechanism.
According to GBT8165-2008, the mechanical property experimental data of the stainless steel coil obtained in example 1 are as follows: the tensile strength is 510MPa, the yield strength is 315MPa, and the elongation is 32%.
Example 2:
the difference compared with example 1 is: a double-sided composite plate coil hot rolling and rolling process thereof, the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 32%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: 0.05% of C, 1.75% of Mn, 9.03% of Ni, 0.65% of Si, 17.85% of Cr, 0.05% of N, 0.5% of Cu, 0.03% of P, 0.005% of S; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: 0.2% of C, 1.5% of Mn, 0.1% of Ni, 0.4% of Si, 0.25% of Cr, 0.006% of N, 0.3% of Cu, 0.03% of P, 0.03% of S, and the balance of Fe and inevitable impurities;
step 1) preheating: feeding the double-sided composite board of the raw material components into a heating furnace for preheating, adjusting the preheating temperature to 718 ℃, and controlling the heating time to 73 min;
step 2) heating: heating for a period of time after preheating, adjusting the heating temperature to 1130 ℃, and controlling the heating time to be 32 min; after the first heating stage, the heating stage enters a second heating stage, the heating temperature is adjusted to 1265 ℃, and the heating time is controlled to 52 min; after the second heating stage, the mixture enters a soaking stage, the heating temperature is adjusted to 1275 ℃, and the heating time is controlled to 38 min; the total in-furnace time is controlled to be 195 min;
step 3), rough rolling: after the double-sided composite steel billet is heated in the heating furnace, the double-sided composite steel billet enters a roughing mill for roughing after being descaled by two groups of descaling water; the rough rolling adopts 7-pass rolling, and the one-pass reduction rate is 22.5%; the reduction rate of the second pass is 25.3 percent; the three-pass reduction rate is 27.15%; the four-pass reduction rate is 24.23 percent; the five-pass reduction rate is 23.83%; the six-pass reduction rate is 21.9 percent; the reduction rate of seven passes is 19.26 percent; in the rough rolling process, 1 and 3 times of descaling operation are put into practice, the hot coil box adopts a straight-through mode, and the rough rolling outlet temperature is 1163 ℃; the thickness of the intermediate blank after rough rolling is 34 mm;
step 4), finish rolling: after the rough rolling is finished, the double-sided composite billet is sent into a finish rolling device through a transmission roller, the finish rolling adopts accelerated rolling, pressure AGC is used, the finish rolling opening temperature is controlled to be 1118 ℃, and the finish rolling finishing temperature is controlled to be 1035 ℃; performing fine rolling and throwing steam for descaling;
according to GBT8165-2008, the mechanical property experimental data of the stainless steel coil obtained in example 1 are as follows: the tensile strength is 530MPa, the yield strength is 335MPa, and the elongation is 29 percent.
Example 3:
the difference compared with example 1 is: a double-sided composite plate coil hot rolling and rolling process thereof, the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 20% -35%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: 0.07% of C, 2% of Mn, 0.5% of Ni, 0.75% of Si, 19.3% of Cr, 0.1% of N, 0.9% of Cu, 0.045% of P, 0.03% of S, and the balance of Fe and inevitable impurities; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: 0.22% of C, 1.6% of Mn, 0.3% of Ni, 0.52% of Si, 0.25% of Cr, 0.01% of N, 0.35% of Cu, 0.035% of P, 0.035% of S, and the balance of Fe and inevitable impurities;
step 1) preheating: the double-sided composite board of the raw material components is sent into a heating furnace for preheating, the preheating temperature is adjusted to 690 and 735 ℃, and the heating time is controlled to 73 min;
step 2) heating: after preheating, heating for a section, adjusting the heating temperature to 1110-1150 ℃, and controlling the heating time to be 37 min; after the first heating stage is finished, the heating process enters a second heating stage, the heating temperature is adjusted to 1255-; after the heating second stage is finished, entering a soaking stage, adjusting the heating temperature to 1270-; the total in-furnace time is controlled to be 194 min;
step 3), rough rolling: after the double-sided composite steel billet is heated in the heating furnace, the double-sided composite steel billet enters a roughing mill for roughing after being descaled by two groups of descaling water; the rough rolling adopts 7-pass rolling, and the one-pass reduction rate is 22.4%; the reduction rate of the second pass is 25.22 percent; the three-pass reduction rate is 26.85 percent; the four-pass reduction rate is 24.1 percent; the five-pass reduction rate is 23.36 percent; the six-pass reduction rate is 21.22 percent; the reduction rate of seven passes is 19.53 percent; in the rough rolling process, 1 and 3 times of descaling operation are put into use, the hot coil box adopts a straight-through mode, and the rough rolling outlet temperature is 1196 ℃; the thickness of the intermediate blank after rough rolling is 30 mm;
step 4), finish rolling: after the rough rolling is finished, the double-sided composite billet is sent into a finish rolling device through a transmission roller, the finish rolling adopts accelerated rolling, pressure AGC is put into use, the finish rolling temperature is controlled to be 1130 ℃, and the finish rolling finishing temperature is 1076 ℃; performing fine rolling and throwing steam for descaling;
according to GBT8165-2008, the mechanical property experimental data of the stainless steel coil obtained in example 1 are as follows: the tensile strength is 539MPa, the yield strength is 315MPa, and the elongation is 35%.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (5)
1. A double-sided composite plate coil hot rolling and rolling process thereof, the double-sided composite plate comprises a base plate and a shroud plate, the shroud plate is arranged above and below a base plate, the thickness ratio of the shroud plate to the base plate is 20% -35%, the base plate is Q355 low-alloy high-strength structural steel, and the shroud plate is 304 stainless steel; the 304 stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.07 percent of C, less than or equal to 2 percent of Mn, less than or equal to 10.5 percent of Ni, less than or equal to 0.75 percent of Si, less than or equal to 19.5 percent of Cr, less than or equal to 0.1 percent of N, less than or equal to 1.0 percent of Cu, less than or equal to 0.045 percent of P, less than or equal to 0.03 percent of S, and the balance of Fe and inevitable impurities; the Q355 low-alloy high-strength structural steel comprises the following chemical components in percentage by weight: less than or equal to 0.24 percent of C, less than or equal to 1.6 percent of Mn, less than or equal to 0.3 percent of Ni, less than or equal to 0.55 percent of Si, less than or equal to 0.3 percent of Cr, less than or equal to 0.01 percent of N, less than or equal to 0.4 percent of Cu, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and inevitable impurities;
the hot rolling process comprises the following steps:
1) preheating: the double-sided composite board of the raw material components is sent into a heating furnace for preheating, the preheating temperature is adjusted to 690 and 735 ℃, and the heating time is controlled to be 70-80 min;
2) heating: after preheating, heating for a section, adjusting the heating temperature to 1110-1150 ℃, and controlling the heating time to be 30-40 min; after the first heating stage is finished, the second heating stage is carried out, the heating temperature is adjusted to 1255-; after the heating second stage is finished, entering a soaking stage, adjusting the heating temperature to 1270-; the total in-furnace time is controlled to be 180-210 min;
3) rough rolling: after the double-sided composite steel billet is heated in the heating furnace, the double-sided composite steel billet enters a roughing mill for roughing after being descaled by two groups of descaling water;
4) finish rolling: after the rough rolling is finished, the double-sided composite steel billet is sent into a finish rolling device through a transmission roller, the finish rolling adopts accelerated rolling, and the finish rolling is carried out by using steam for descaling;
5) coiling: conveying the double-sided composite board coil subjected to finish rolling to a coiling mechanism through a conveying roller for coiling;
6) uncoiling and welding: welding and fixing the two groups of double-sided composite plate steel coils by a welding device;
7) annealing: annealing and cooling the double-sided composite plate coil by an annealing device;
8) scale breaking and shot blasting: performing pulling, straightening, descaling and shot blasting operation on the annealed and cooled double-sided composite plate coil through a scale breaking device and a shot blasting device;
9) acid washing: performing acid pickling treatment on oxide skins formed on the surfaces of the double-sided composite plate coil through an acid pickling mechanism;
10) drying: the pickling solution remained on the surface of the steel strip is cleaned through high-pressure water flow of the cleaning mechanism, then the steel strip is dried through the drying device, and then the steel strip is coiled and bundled through the coiling mechanism.
2. The hot rolling and rolling process of the double-sided composite plate coil as claimed in claim 1, wherein the rough rolling adopts 7 passes of rolling, and the one-pass reduction rate is 22-23%; the reduction rate of the second pass is 24-26%; the three-pass reduction rate is 26.5-28%; the four-pass reduction rate is 23-25%; the five-pass reduction rate is 21-24%; the six-pass reduction rate is 20-22%; the reduction rate of seven passes is 18-20%; the rolling speed is 4m/s-5m/s, 1 and 3 times of descaling operation are put into the rough rolling process, the hot rolling box adopts a straight-through mode, and the rough rolling outlet temperature is 1180 +/-20 ℃; the thickness of the intermediate blank after rough rolling is 30-35 mm.
3. The hot rolling and rolling process of the double-sided composite plate coil as claimed in claim 1, wherein the finish rolling is accelerated rolling at a rolling speed of 7m/s to 8m/s, a rolling temperature of 1120 ± 10 ℃ and a finishing temperature of 1050 ± 30 ℃.
4. The hot rolling and rolling process of the double-sided composite plate coil as claimed in claim 1, wherein the pickling process comprises a first mixed acid section and a second mixed acid section; the concentration of the first-stage mixed acid HNO3 is 80 +/-5 g/L, the concentration of HF is 35 +/-5 g/L, the metal ions are less than 40g/L, and the temperature is 55 +/-5 ℃; the concentration of the mixed acid second-stage HNO3 is 70 +/-5 g/L, the concentration of HF is 30 +/-5 g/L, the metal ion is less than 35g/L, and the temperature is 45 +/-5 ℃.
5. The hot rolling and rolling process of the double-sided composite plate coil as claimed in claim 1, wherein the chemical components of the 304 stainless steel comprise, by weight, Ni of 8% or more and Cr of 17.5% or more.
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Application publication date: 20211105 |