CN110819770B - Steel plate for large-thickness hydrogenation reactor shell and manufacturing method thereof - Google Patents
Steel plate for large-thickness hydrogenation reactor shell and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005242 forging Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000003892 spreading Methods 0.000 claims abstract description 5
- 230000007480 spreading Effects 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000001833 catalytic reforming Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
- C22C38/18—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a steel plate for a large-thickness hydrogenation reactor shell and a manufacturing method thereof. The steel contains 2.0 to 4.0 percent of Cr, 0.80 to 1.20 percent of Mo, 0.00 to 0.50 percent of V and 0.80 to 1.30 percent of Ceq; the production process of the steel plate comprises the following steps: selecting a blank, processing the blank, spreading a fluxing agent, assembling, welding and fixing, heating and forging, heating and rolling and heat treatment. The method can produce a hydrogenation reactor shell steel plate with a plate shape and excellent surface quality, and the thickness specification is 180-230 mm; the room temperature yield strength of the steel plate joint is more than or equal to 430MPa, the tensile strength is more than or equal to 610MPa, the elongation after fracture is more than or equal to 22.0 percent, the short-time high-temperature yield strength at 450 ℃ is more than or equal to 310MPa, the impact absorption energy at-30 ℃ is more than or equal to 200J, Z, the performance is more than or equal to 70 percent, and the shear strength is more than or equal to 350 MPa; the yield can reach more than 85 percent.
Description
Technical Field
The invention relates to the field of metal materials, in particular to a steel plate for a hydrogenation reactor shell with the thickness of 180-230 mm and a manufacturing method thereof.
Background
The hydrogenation reactor is a key apparatus in the oil refining industry, and is mainly used for the hydrocracking and hydrofining of petroleum refining or heavy oil, and the catalytic reforming, desulfurization, heavy metal removal and other processes. In recent years, the demand for petroleum products is increasing, the deterioration of petroleum resources is increasing, and the development of a hydrorefining technology shows the trend of large-scale refining integration, diversification and heavy deterioration in order to meet the economic development and environmental protection requirements. Enterprises continuously lengthen the device operation cycle and put higher requirements on the safety of equipment. In order to meet the requirements, the designed hydrogenation reactor is increasingly large in scale, the largest forge welding hydrogenation reactor in the world is manufactured in 2018, the total weight reaches 2400 tons, the total length exceeds 70 meters, the outer diameter is 5.4 meters, the wall thickness exceeds 200mm, and the weight and the complexity of the manufacturing process break through the manufacturing record of the hydrogenation reactor in the world.
Therefore, the large thick-wall ultra-large hydrogenation reactor is a development trend of the future oil refining industry, because the operation environment is a long-period, high-temperature and high-pressure and hydrogen corrosion environment, in order to operate safely, the steel plates of 2.25Cr-1Mo, 2.25Cr-1Mo-0.25V, 3Cr1Mo-0.25V and the like with the thickness of 180-230 mm are mostly selected as the material of the manufacturing equipment, or in order to reduce the weight of the equipment and improve the corrosion resistance, the steel plates of 2.25Cr-1Mo, 2.25Cr-1Mo-0.25V, 3Cr1Mo-0.25V and the like with the thickness of 150-200 mm are selected to be overlaid with single-layer or double-layer E309L and E347 welding materials.
Patent CN 108655351 a discloses a "steel ingot casting method of steel 12Cr2Mo1R (H) for hydrogenation reactor", which can manufacture a steel sheet for large-weight and large-thickness reactor shell, but because of ingot smelting, the control of internal defects such as inclusions and segregation is difficult, the performance of the final steel sheet is easy to fluctuate, and the ingot production has problems such as high cost and long manufacturing period.
Patent CN201620159194.4 discloses a hydrogenation reactor forging, although the invention can produce a large-thickness forging plate, the steel plate is high in cost and the surface quality of the steel plate cannot be guaranteed due to the adoption of a forge welding mode.
Patent CN200910312460.7 discloses a steel plate for large-thickness hydrogenation reactor reel equipment and a production method thereof, although the invention can develop the steel plate for large-thickness hydrogenation reactor, the manufacturing cost is very high by adopting a casting and electroslag remelting mode.
Disclosure of Invention
Therefore, in order to solve the above problems, the present invention aims to provide a steel plate for a large-thickness hydrogenation reactor shell and a manufacturing method thereof, which solve the problems of segregation of internal quality and poor surface quality in forging production by using steel ingots, and develop a steel plate with good internal and surface quality and excellent comprehensive performance, so as to solve the problem of service life reduction of a hydrogenation reactor in a long-term high-pressure, high-temperature and hydrogen corrosion environment, and have the advantages of excellent comprehensive performance, obviously prolonged service life of equipment, and ensured safe production and operation of equipment.
The specific technical scheme is as follows:
a steel plate for a large-thickness hydrogenation reactor shell comprises the following alloy elements in percentage by weight: 2.0-4.0% of Cr, 0.80-1.20% of Mo, 0.00-0.50% of V and 0.80-1.30% of CEV, wherein the CEV is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15, and the thickness of the finished steel plate is 180-230 mm.
The action mechanism of each element in the invention is as follows:
cr: chromium is a strong carbide forming element, has higher hardenability and can obviously improve the room temperature strength and the medium temperature strength of the reactor shell steel plate, so the Cr content is controlled to be 2.0-4.0 percent;
mo: the molybdenum has the functions of improving hardenability and heat strength and preventing temper brittleness in the steel for the reactor shell, so that the content of Mo is controlled to be 0.80-1.20 percent;
v: the vanadium can refine the crystal grains of the steel, improve the strength and low-temperature toughness of the steel, improve the welding performance of the steel and simulate the post-welding heat treatment performance, and simultaneously, the vanadium can fix carbon and improve the hydrogen corrosion resistance of the steel at high temperature. Therefore, the content of V is controlled to be 0-0.50%;
CEV: in order to ensure the strength of the large-thickness steel plate in the thickness direction, the use requirement is met. Meanwhile, the factors of over high carbon equivalent, difficult welding and the like are avoided, so the CEV is controlled to be 0.80-1.30 percent.
In order to meet the comprehensive performance requirement of the steel plate for the shell of the large-thickness hydrogenation reactor, the process route of the invention is as follows: selecting a blank, processing the blank, spreading a fluxing agent, assembling, welding and fixing, heating and forging, heating and rolling and heat treatment, and specifically comprises the following steps:
(1) selecting paired homogeneous continuous casting blanks with the thickness specification of 300-360 mm as raw materials for producing large-thickness steel plates with the compression ratio of more than or equal to 3;
(2) the long edge of the blank to be assembled is beveled to the surface to be contacted of the blank along the thickness center, so that the surface to be contacted and the bevel of the bevel form an included angle of 30-45 degrees; then cleaning the surface to be contacted, removing the rust layer, exposing fresh and bright metal, and performing oil stain removal treatment on the metal surface to prevent the bonding effect from being influenced by foreign matters on the surface;
(3) uniformly mixing iron powder and chromium powder according to the mass ratio of 50: 1-30: 1 to obtain a metal powder fusion agent; uniformly spreading a metal powder fusion agent on the cleaned surface to be contacted, wherein the thickness range is 0.2-0.5 mm; in the metal powder fluxing agent, the purity of chromium powder is more than 99.9%, and the granularity is 0.5-10 mu m; the purity of the iron powder is more than 99.9 percent, and the granularity is 0.5-10 mu m; the design of the process and the parameters mainly aims at that the steel material for the reactor contains higher chromium element, the steel material is compared with the actual component proportion of the iron base, ultra-high-purity superfine powder is adopted to uniformly spread the surface to play a role of a transition layer, and in the processes of heating, forging and rolling a blank, fine dispersed mixed metal powder has higher activation energy and is easier to diffuse to casting blank matrixes at two sides to form metallurgical bonding with the matrixes, so that the bonding rate and the stability of a bonding surface are improved;
(4) and (3) stacking the other casting blank processed according to the step (2) on the casting blank sprayed with the metal powder fluxing agent to form a combined blank. At the moment, the included angle of the groove of the combined blank is 60-90 degrees, and the groove needs to be preheated at the temperature of 100-200 ℃ before welding after the assembly due to high carbon equivalent of the steel plate; welding and fixing two long edges of the combined blank, preventing the combined blank from moving during forging and pressing, and performing heat preservation and slow cooling on the welded combined blank at 200-300 ℃, wherein because the carbon equivalent of the steel blank is high, if preheating and postweld slow cooling measures are not adopted, a welding heat affected zone is easy to generate welding stress, the blank is cracked, and the assembly effect is affected;
(5) the combined blank is kept at 1200-1250 ℃ for 10-15 h and is evenly burnt through, the metal powder fusion agent is fully diffused during the period, and harmful gas in steel is fully discharged;
(6) after the combined billet is taken out of the furnace, a large-tonnage forging hydraulic press is adopted to forge the combined billet in the thickness direction, the combined billet is sequentially forged from the middle part of the billet to two ends (X and-X directions), the single forging amount is 80-150 mm, the large forging amount is used for ensuring that the longitudinal pressure fully permeates the core part of the billet to fully deform and weld the combined billet, meanwhile, the gas at the combined surface of the combined billet is fully extruded to ensure the combination quality, which cannot be achieved by a rolling mode, and the thickness of the combined billet after forging is 300-350 mm;
(7) rolling the forged combined blank after preserving heat at 1150-1250 ℃ for 15-25 min/cm, wherein the compression ratio is more than or equal to 3, the thickness of a finished product is 180-230 mm, and the rolled steel plate of the combined blank has excellent surface quality and plate shape;
(8) heat treatment of the rolled steel sheet: quenching temperature is 930-960 ℃, and heat preservation is carried out for 2.0-4.0 min/mm; the tempering temperature is 730-760 ℃, the heat preservation is 3.0-6.0 min/mm, and the steel plate after heat treatment has good comprehensive mechanical properties and meets the use requirements of the reactor.
Has the advantages that:
compared with the prior art, the invention has the following beneficial effects:
(1) the method can produce a hydrogenation reactor shell steel plate with a plate shape and excellent surface quality, and the thickness specification is 180-230 mm;
(2) the developed steel plate for the large-thickness hydrogenation reactor shell has excellent comprehensive performance, the room-temperature yield strength of the joint of the steel plates is more than or equal to 430MPa, the tensile strength is more than or equal to 610MPa, the elongation after fracture is more than or equal to 22.0%, the short-time high-temperature yield strength at 450 ℃ is more than or equal to 310MPa, the impact absorption energy at-30 ℃ is more than or equal to 200J, Z, the performance is more than or equal to 70%, and the shear strength is more than or equal to 350 MPa;
(3) compared with the traditional ingot rolling or forging forming rate of 60-70%, the forming rate of the invention can reach more than 85%; the steel plate ultrasonic detection result 100% meets NB/T47013.3I level results;
(4) the traditional vacuumizing assembly process is omitted in the process, and equipment investment and process cost are avoided.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
Table 1 shows the chemical composition of steel sheets according to examples of the present invention; table 2 is the metal powder fluxing agent composition of the present invention; table 3 shows the rolling process parameters of the steel sheets according to the examples of the present invention; table 4 shows the example heat treatment process parameters; table 5 shows the results of the comprehensive mechanical properties of the steel sheets of the examples of the present invention; table 6 inner and outer mass of steel sheets of examples of the present invention.
TABLE 1 chemical composition wt% of steel sheet of inventive example
| Examples | C | Si | Mn | P | S | Cr | Mo | V | CEV |
| 1 | 0.12 | 0.15 | 0.33 | 0.005 | 0.0021 | 2.1 | 0.85 | 0 | 0.88 |
| 2 | 0.13 | 0.11 | 0.34 | 0.005 | 0.0012 | 3.2 | 1.00 | 0.28 | 0.98 |
| 3 | 0.14 | 0.13 | 0.41 | 0.006 | 0.0013 | 2.6 | 1.13 | 0.33 | 1.03 |
| 4 | 0.15 | 0.14 | 0.40 | 0.007 | 0.0018 | 3.8 | 1.05 | 0.47 | 1.28 |
| 5 | 0.11 | 0.10 | 0.36 | 0.004 | 0.0015 | 3.0 | 0.80 | 0.15 | 0.96 |
| 6 | 0.12 | 0.12 | 0.38 | 0.005 | 0.0008 | 3.8 | 1.20 | 0.50 | 1.29 |
TABLE 2 composition of metal powder fluxing agent of the present invention
TABLE 3 Process parameters for the assembly of steel sheets of the examples of the invention
TABLE 4 Heat treatment Process parameters of Steel sheets according to examples of the present invention
TABLE 5 comprehensive mechanical properties results for steel sheets of the examples of the invention
TABLE 6 internal and external quality of Steel sheets according to examples of the invention
| Examples | Percentage of finished product% | Ultrasonic flaw detection | Unevenness/mm/m |
| 1 | 89 | NB/T47013.3 stage I | 3.0 |
| 2 | 86 | NB/T47013.3 stage I | 2.0 |
| 3 | 90 | NB/T47013.3 stage I | 2.5 |
| 4 | 88 | NB/T47013.3 stage I | 2.0 |
| 5 | 87 | NB/T47013.3 stage I | 2.5 |
| 6 | 91 | NB/T47013.3 stage I | 2.5 |
According to the results, the 180-230 mm thick hydrogen steel plate provided by the invention has excellent comprehensive performance, high yield and flaw detection qualification rate which can reach more than 85%, and good surface quality.
Claims (1)
1. The steel plate for the large-thickness hydrogenation reactor shell is characterized by comprising the following chemical components in percentage by mass: 3.0-4.0% of Cr, 0.80-1.20% of Mo, 0.15-0.50% of V and 0.80-1.30% of CEV, wherein CEV% = C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15; the thickness of the finished steel plate is 200-230 mm; the manufacturing method of the steel plate for the large-thickness hydrogenation reactor shell comprises the following production processes: selecting a blank, processing the blank, spreading a fluxing agent, assembling, welding and fixing, heating and forging, heating and rolling, and performing heat treatment,
(1) selecting paired homogeneous continuous casting blanks with the thickness specification of 300-360 mm as raw materials for producing large-thickness steel plates with the compression ratio of more than or equal to 3;
(2) beveling the long edge of the blank to be assembled to the surface to be contacted of the blank along the thickness center, so that the included angle between the surface to be contacted and the bevel of the bevel is 30-45 degrees; then cleaning the surface to be contacted, removing the rust layer, exposing fresh and bright metal, and performing oil stain removal treatment on the metal surface;
(3) uniformly mixing iron powder and chromium powder according to the mass ratio of 50: 1-30: 1 to obtain a metal powder fusion agent; uniformly spreading a metal powder fusion agent on the cleaned surface to be contacted, wherein the thickness range is 0.2-0.5 mm; in the metal powder fluxing agent, the purity of chromium powder is more than 99.9%, and the granularity is 0.5-10 mu m; the purity of the iron powder is more than 99.9 percent, and the granularity is 0.5-10 mu m;
(4) stacking the other casting blank processed in the step (2) on the casting blank scattered with the metal powder fluxing agent to form a combined blank; at the moment, the included angle of the groove of the combined blank is 60-90 degrees, the groove is preheated, and the preheating temperature is 100-200 ℃; welding and fixing two long edges of the combined blank, and performing heat preservation and slow cooling on the welded combined blank at 200-300 ℃;
(5) preserving the heat of the combined blank at 1200-1250 ℃ for 10-15 h;
(6) forging and pressing the combined blank in the thickness direction after discharging, sequentially forging and pressing the combined blank from the middle part to two ends, wherein the single forging and pressing amount is 80-150 mm, and the thickness of the forged combined blank is 300-350 mm;
(7) rolling the forged combined blank after heat preservation at 1150-1250 ℃ for 15-25 min/cm;
(8) heat treatment of the rolled steel sheet: quenching temperature is 930-960 ℃, and heat preservation is carried out for 2.0-4.0 min/mm; the tempering temperature is 730-760 ℃, and the heat preservation is 3.0-6.0 min/mm.
Priority Applications (1)
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| CN112877604B (en) * | 2021-01-14 | 2022-07-05 | 山东钢铁股份有限公司 | Production method of 12Cr2Mo1R super-thick hydrogenation reactor steel plate |
| CN118478189B (en) * | 2024-07-12 | 2024-09-17 | 中北大学 | Method for improving high-temperature fatigue performance of 2.25Cr-1Mo-0.25V steel hydrogen delivery pipe |
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