CN113604752B - Production process of 840Mo iron-nickel base alloy hot continuous rolling plate coil - Google Patents
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- 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
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- 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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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a production process of 840Mo iron-nickel based alloy hot continuous rolling coiled sheet, which comprises the following chemical components in percentage by weight: less than or equal to 0.04 percent of C, less than or equal to 0.65 percent of Mn, less than or equal to 21 percent of Ni, less than or equal to 1.1 percent of Mo, less than or equal to 0.45 percent of Si, less than or equal to 22.5 percent of Cr, less than or equal to 0.33 percent of Al, less than or equal to 0.025 percent of P, and less than or equal to 0.0015 percent of S; ti is less than or equal to 0.22 percent, and the balance is Fe element and inevitable impurities; the process comprises the following steps: 1) preparing the components to a heating furnace for heating, wherein the heating steps comprise a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 200-220 mm; 2) rough rolling; 3) fine rolling; 4) coiling; 5) uncoiling and welding; 6) annealing; 7) breaking phosphorus and performing shot blasting; 8) acid washing: the acid washing process is provided with a mixed acid first section and a mixed acid second section; 9) and (5) cleaning and drying. The invention can improve the production efficiency and the stability of the product quality.
Description
Technical Field
The invention belongs to the technical field of hot rolling production of iron-nickel alloy, and particularly relates to a production process of 840Mo iron-nickel base alloy hot continuous rolling coiled sheet.
Background
The 840Mo iron-nickel base alloy has corrosion cracking resistance, phosphorus acid resistance and certain corrosion resistance to various acid liquids, is adopted in industrial equipment such as machinery, chemical engineering, electronics and the like, is particularly recommended to be used under the condition of strong corrosion, is widely applied to equipment with strict sealing performance such as chemical engineering equipment, crude oil and natural gas production equipment and the like, and is also used for oil and gas pipelines, oil and gas coolers and the like.
Meanwhile, the existing 840Mo iron-nickel base alloy plate also has a rolling method of rolling (sheet rolling) by a single-frame reversible rolling mill; the method has the defects of high energy consumption, relatively low production efficiency and the like;
there is therefore a need for an iron-nickel based alloy that is relatively efficient in production and more suitable for use in closed and multi-gap corrosion resistant equipment for its intended use and method of production.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a production process of a 840Mo iron-nickel base alloy hot continuous rolling coiled sheet, which can improve the production efficiency and the stability of the product quality.
In order to achieve the purpose, the invention adopts the technical scheme that:
a production process of 840Mo iron nickel base alloy hot continuous rolling plate coils comprises the following chemical components in percentage by weight: less than or equal to 0.04 percent of C, less than or equal to 0.65 percent of Mn, less than or equal to 21 percent of Ni, less than or equal to 1.1 percent of Mo, less than or equal to 0.45 percent of Si, less than or equal to 22.5 percent of Cr, less than or equal to 0.33 percent of Al, less than or equal to 0.025 percent of P, and less than or equal to 0.0015 percent of S; ti is less than or equal to 0.22 percent, and the balance is Fe element and inevitable impurities;
the process comprises the following steps:
1) preparing the components to a heating furnace for heating, wherein the heating steps comprise a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 200-220 mm; the preheating section is controlled at 710-780 ℃, and the heating time is set to be 60-75 min; after the preheating section is finished, the heating section is heated, the temperature is controlled to be 1000-1130 ℃, and the heating time is set to be 45-55 min; after the first heating stage is finished, the heating process enters a second heating stage for heating, the temperature is controlled at 1265-1285 ℃, and the heating time is set to be 45-50 min; after the second heating stage is finished, the mixture enters a soaking stage, the temperature is controlled at 1265 and 1280 ℃, and the heating time is set to be 35-40 min; the total heating time is 185-215 min.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 7-pass rolling on the steel ingot during rough rolling, wherein the reduction rate of one pass is 20-21.5%; the reduction rate of the second pass is 22.3-24.7%; the three-pass reduction rate is 23.6-25.8%; the four-pass reduction rate is 25.1-27.5%; the five-pass reduction rate is 26.2-28.3%; the six-pass reduction rate is 25.3-27.1%; the seven-pass reduction rate is 23.1-25.3%.
3) Finish rolling: the steel wire is conveyed into a finish rolling mechanism, and the finish rolling starting temperature is set to 1060-; the finishing temperature of the finish rolling is more than 980 ℃.
4) Coiling: and after finish rolling, feeding the steel into a coiling mechanism for coiling.
5) Uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated.
6) Annealing: the 840 alloy plate is annealed by an annealing mechanism and then cooled.
7) Breaking phosphorus and performing shot blasting; and performing shot blasting treatment on the annealed 840 alloy plate by using a shot blasting machine.
8) Acid washing: pickling 840 alloy plate by a pickling mechanism to remove oxide skin; 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 45 +/-5 g/L, the concentration of HF is 7 +/-1 g/L, the metal ion is less than 35g/L, and the temperature is 45-55 ℃; the concentration of the mixed acid second-stage HNO3 is 65 +/-5 g/L, the concentration of HF is less than 1.0g/L, the concentration of metal ions is less than 30g/L, and the temperature is 30-35 ℃.
9) Cleaning and drying: and cleaning the 840 alloy plate after the acid cleaning through a cleaning mechanism, and then drying the 840 alloy plate through a drying system and then performing curling treatment.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, molybdenum is added into the raw material components, and the molybdenum can strengthen the matrix and improve the high-temperature strength and creep property of the matrix. Meanwhile, the addition of molybdenum enables the passive film on the surface of the matrix to be more stable, so that the corrosion resistance of the 840Mo plate coil can be improved; particularly in chloride solution, molybdenum can improve the pitting corrosion resistance and effectively inhibit crevice corrosion; in addition, the molybdenum element can make the passive film more compact and firm and resist the corrosion of sulfuric acid;
2) the invention adopts a hot continuous rolling mode to produce 840Mo strip coils of iron-nickel-based alloy, and the invention adopts a hot continuous rolling production line to produce 840Mo strip coils, and then carries out solid solution pickling on the strip coils, thereby having the advantages of low energy consumption, high production efficiency, stable batch, high yield, high dimensional precision and the like, and obtaining 840Mo hot-rolled pickled strip coils with more excellent quality data.
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 production process of 840Mo iron nickel base alloy hot continuous rolling plate coils comprises the following chemical components in percentage by weight: 0.02% of C, 0.058% of Mn, 19.1% of Ni, 0.91% of Mo, 0.38% of Si, 19.45% of Cr, 0.21% of Al, 0.018% of P, 0.001% of S; 0.19% of Ti, and the balance of Fe element and inevitable impurities;
the process comprises the following steps:
1) preparing the components to a heating furnace for heating, wherein the heating steps comprise a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 215 mm; a preheating section, wherein the temperature is controlled at 725 ℃, and the heating time is set to 65 min; after the preheating section is finished, heating for a first time, wherein the temperature is controlled to be 1115 ℃, and the heating time is set to be 45 min; heating for the first stage at 1280 deg.C for 45min, and heating for the second stage; after the second heating stage, the mixture enters a soaking stage, the temperature is controlled to 1278 ℃, and the heating time is set to 35 min; the total heating time is 190 min.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device; carrying out 7-pass rolling on the steel ingot during rough rolling; the reduction rate of one pass is 20.2 percent; the reduction rate of the second pass is 23.23 percent; the three-pass reduction rate is 23.9 percent; the four-pass reduction rate is 25.45 percent; the five-pass reduction rate is 26.26%; the six-pass reduction rate is 25.7 percent; the seven-pass reduction rate is 24.8%.
3) Finish rolling: the steel is conveyed into a finish rolling mechanism, and the finish rolling start temperature is set to be 1068 ℃; the finish rolling temperature was 995 ℃.
4) Coiling: and after finish rolling, feeding the steel plate into a coiling mechanism for coiling.
5) Uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated.
6) And (3) annealing: the 840 alloy plate is annealed by an annealing mechanism and then cooled.
7) Breaking phosphorus and performing shot blasting; and performing shot blasting treatment on the annealed 840 alloy plate by using a shot blasting machine.
8) Acid washing: pickling 840 alloy plate by a pickling mechanism to remove oxide skin; 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 44.3g/L, the concentration of HF is 6.4g/L, the metal ion concentration is 28g/L, and the temperature is 50.5 ℃; the concentration of the mixed acid second-stage HNO3 is 66.4g/L, the concentration of HF is 0.75g/L, the concentration of metal ions is 24.6g/L, and the temperature is 32.5 ℃.
9) Cleaning and drying: and cleaning the 840 alloy plate after the acid cleaning through a cleaning mechanism, and then drying the 840 alloy plate through a drying system and then performing curling treatment.
Example 2:
the difference compared with example 1 is:
step 1) preparing the components to a heating furnace for heating, wherein the heating step comprises a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 205 mm; a preheating section, wherein the temperature is controlled at 734 ℃, and the heating time is set to be 70 min; after the preheating section is finished, heating for a first time, wherein the temperature is controlled to be 1120 ℃, and the heating time is set to be 55 min; heating for the first time, heating for the second time at 1278 deg.C for 45 min; after the second heating stage is finished, the mixture enters a soaking stage, the temperature is controlled at 1268 ℃, and the heating time is set to 35 min; the total heating time period was 205 min.
The one-time pressing rate in the step 2) is 20.85 percent; the reduction rate of the second pass is 23.05 percent; the three-pass reduction rate is 23.95 percent; the four-pass reduction rate is 26.15 percent; the five-pass reduction rate is 27.05 percent; the six-pass reduction rate is 26.66%; the seven-pass reduction rate is 25.04%.
Setting the finish rolling start temperature to 1075 ℃ in the step 3); the finish rolling temperature was 1005 ℃.
In the step 8), the concentration of the mixed acid first-stage HNO3 is 46.4g/L, the concentration of HF is 7.2g/L, the metal ion concentration is 26.5g/L, and the temperature is 52.5 ℃; the concentration of the mixed acid second-stage HNO3 is 63.8g/L, the concentration of HF is 0.88g/L, the concentration of metal ions is 26.5g/L, and the temperature is 34 ℃.
Example 3:
the difference compared with example 1 is:
step 1) preparing the components to a heating furnace for heating, wherein the heating step comprises a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 220 mm; the preheating section is controlled at 710-780 ℃, and the heating time is set as 65 min; after the preheating section is finished, heating in a heating section, wherein the temperature is controlled to be 1000-1130 ℃, and the heating time is set to be 45 min; after the first heating stage is finished, the heating process enters a second heating stage, the temperature is controlled at 1265-1285 ℃, and the heating time is set to be 48 min; after the heating second stage is finished, the mixture enters a soaking stage, the temperature is controlled at 1265 and 1280 ℃, and the heating time is set to 35 min; the total heating time was 193 min.
The one-time pressing rate in the step 2) is 20.74 percent; the reduction rate of the second pass is 22.95 percent; the three-pass reduction rate is 24.04%; the four-pass reduction rate is 26.32%; the five-pass reduction rate is 27.25 percent; the six-pass reduction rate is 26.35 percent; the reduction rate of seven passes was 24.54%.
Setting the initial rolling temperature of finish rolling in the step 3) to be 1070 ℃; the finish rolling temperature was 996 ℃.
Mechanical property detection is carried out on the samples of the embodiment 1, the embodiment 2 and the embodiment 3 according to GB/T2054-2013, and the obtained results are shown in a table I:
table one:
| examples | Tensile strength Mpa | Specifying the plastic elongation strength Mpa | Elongation after fracture% | Conclusion |
| 1 | 646 | 352 | 41 | Qualified |
| 2 | 619 | 349 | 44 | Qualified |
| 3 | 637 | 367 | 42.8 | Qualified |
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 (4)
1. A production process of 840Mo iron-nickel base alloy hot continuous rolling plate coils comprises the following process steps: heating, rough rolling, finish rolling, curling, uncoiling and welding, annealing, scale breaking and shot blasting, acid washing, cleaning and drying;
the steel plate is characterized in that the 840Mo iron nickel base alloy hot continuous rolling plate roll comprises the following chemical components in percentage by weight: c is more than or equal to 0.02 percent and less than or equal to 0.04 percent, Mn is more than or equal to 0.058 percent and less than or equal to 0.65 percent, Ni is more than or equal to 19.1 percent and less than or equal to 21 percent, Mo is more than or equal to 0.91 percent and less than or equal to 1.1 percent, Si is more than or equal to 0.38 percent and less than or equal to 0.45 percent, Cr is more than or equal to 19.45 percent and less than or equal to 22.5 percent, Al is more than or equal to 0.21 percent and less than or equal to 0.33 percent, P is more than or equal to 0.018 percent and less than or equal to 0.025 percent, and S is more than or equal to 0.001 percent and less than or equal to 0.0015 percent; ti is more than or equal to 0.19 percent and less than or equal to 0.22 percent, and the balance is Fe element and inevitable impurities;
the method comprises the following specific steps:
1) preparing the components to a heating furnace for heating, wherein the heating steps comprise a preheating section, a heating section and a soaking section, and the thickness of the plate blank is 200-220 mm; the temperature of the middle preheating section is controlled at 710-780 ℃, and the heating time is set to be 60-75 min; after the preheating section is finished, the heating section is heated, the temperature is controlled to be 1000-1130 ℃, and the heating time is set to be 45-55 min; after the first heating stage is finished, the heating process enters a second heating stage for heating, the temperature is controlled at 1265-1285 ℃, and the heating time is set to be 45-50 min; after the second heating stage is finished, the mixture enters a soaking stage, the temperature is controlled at 1265 and 1280 ℃, and the heating time is set to be 35-40 min; the total heating time is 185-215 min.
2) Rough rolling: the heated steel ingot is conveyed to a roughing mill through a conveying roller, and a corresponding heat-insulating cover is arranged on a conveying device;
3) finish rolling: the steel plate enters a finish rolling mechanism through transmission;
4) coiling: after finish rolling, feeding the steel plate into a coiling mechanism for coiling;
5) uncoiling and welding: two adjacent groups of steel plates are welded and fixed through a welding mechanism, so that the whole pickling of the steel plates is facilitated;
6) annealing: annealing the 840 alloy plate through an annealing mechanism, and then cooling;
7) breaking phosphorus and performing shot blasting; performing shot blasting treatment on the annealed 840 alloy plate through a shot blasting machine;
8) acid washing: pickling 840 alloy plate by a pickling mechanism to remove oxide skin; the acid washing process is provided with a mixed acid first section and a mixed acid second section;
9) cleaning and drying: and cleaning the 840 alloy plate after the acid cleaning through a cleaning mechanism, and then drying the 840 alloy plate through a drying system and then performing curling treatment.
2. The production process of the 840Mo iron-nickel based alloy hot continuous rolling plate coil according to claim 1, characterized in that the steel ingot is subjected to 7-pass rolling during rough rolling in the step 2), and the reduction rate of one pass is 20-21.5%; the reduction rate of the second pass is 22.3-24.7%; the three-pass reduction rate is 23.6-25.8%; the four-pass reduction rate is 25.1-27.5%; the five-pass reduction rate is 26.2-28.3%; the six-pass reduction rate is 25.3-27.1%; the seven-pass reduction rate is 23.1-25.3%.
3. The production process of the 840Mo iron-nickel based alloy hot continuous rolling coiled sheet of claim 1, wherein in the step 8), acid is mixed for one section of HNO 3 The concentration is 45 +/-5 g/L, the HF concentration is 7 +/-1 g/L, the metal ion is less than 35g/L, and the temperature is 45-55 ℃; mixed acid two-stage HNO 3 The concentration is 65 plus or minus 5g/L, the HF concentration is less than 1.0g/L, the metal ion is less than 30g/L, and the temperature is 30-35 ℃.
4. The production process of 840Mo iron nickel base alloy hot continuous rolling plate coil as claimed in claim 1, wherein the finish rolling start temperature in step 3) is set to 1060-1080 ℃; the finishing temperature of the finish rolling is more than 980 ℃.
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