CN112575255A - Preparation method of 15MnNiNbDR steel plate for ultralow-temperature storage tank - Google Patents
Preparation method of 15MnNiNbDR steel plate for ultralow-temperature storage tank Download PDFInfo
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- CN112575255A CN112575255A CN202011333308.XA CN202011333308A CN112575255A CN 112575255 A CN112575255 A CN 112575255A CN 202011333308 A CN202011333308 A CN 202011333308A CN 112575255 A CN112575255 A CN 112575255A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000003860 storage Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000005496 tempering Methods 0.000 claims abstract description 15
- 238000010583 slow cooling Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 8
- 229910001562 pearlite Inorganic materials 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 238000004904 shortening Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- 229910001566 austenite Inorganic materials 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 230000005574 cross-species transmission Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
-
- 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
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a preparation method of 15MnNiNbDR steel plate for an ultra-low temperature storage tank, which adopts reasonable component design and a series of process measures including clean steel smelting, heating, rolling, pile cooling, normalizing heat treatment, slow cooling self-tempering and the like, particularly adopts a normalizing and slow cooling self-tempering process, has yield strength which is 40-60MPa more than standard ratio, tensile strength which is 20-50MPa more than standard ratio, elongation which is 3-5% more than standard ratio, and V-shaped impact power of minus 50 ℃ which is 180J, and carries out simulated postweld heat treatment at the temperature of 620 +/-10 ℃ for 6-12h, the performance still meets the technical requirement of 15MnNiNbDR, and simultaneously has the advantages of reducing production cost, improving production efficiency, reducing material on-line pressure occupation and having good market popularization value due to the shortening of heat treatment process.
Description
Technical Field
The invention belongs to the field of medium plate production, and particularly relates to a preparation method of a 15MnNiNbDR steel plate for an ultralow-temperature storage tank.
Background
The steel for the pressure vessel is steel for special equipment, the service environment that faces is abominable, and the security is high, in order to guarantee the security of removing the low temperature storage tank container, only can increase the thickness of steel sheet, has increased the weight of removing container low temperature storage tank self like this, has reduced on-vehicle removal container capacity, has increased the cost of transportation, has also wasted precious steel resource simultaneously, and this is also the difficult problem that the manufacturing industry faces. In order to ensure a high-strength and good-toughness pressure vessel plate, a problem of making light-weight and safe materials for a movable vessel is solved in the metallurgical industry, so that on the premise of advocating green environmental protection and energy saving and cost reduction in preparation, the materials for high strength and high toughness need to be selected for the ultralow-temperature movable low-temperature storage tank, and therefore research on preparation of ultralow-temperature movable storage tank steel 15MnNiNbDR is carried out.
However, in the traditional preparation process, the steel plate needs to be subjected to normalizing and tempering treatment, so that the production cost is high on one hand, and the process flow is long on the other hand, so that the online pressure of the steel plate is easily occupied, and the logistics is influenced.
Disclosure of Invention
In order to solve the technical defects, the invention aims to provide a preparation method of a 15MnNiNbDR steel plate for an ultra-low temperature storage tank, which can effectively achieve the effects of energy conservation, environmental protection, cost reduction and production flow simplification.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of 15MnNiNbDR steel plates for ultra-low temperature storage tanks comprises KR molten iron de-S, converter smelting, LF refining, VD vacuum refining, continuous casting and pouring, slab heating, rolling, heap cooling, normalizing heat treatment, performance inspection and cutting and warehousing, and is characterized in that: a slow cooling self-tempering process is added in the normalizing heat treatment, so that the steel plate for the ultra-low temperature storage tank is subjected to simulated post-welding heat treatment at the temperature of 620 +/-10 ℃ and under the condition of heat preservation for 6-12h, and the performance of the 15MnNiNbDR technical requirement is met;
wherein the normalizing temperature is controlled at 870 ℃ of 860 ℃ and the heat preservation time is 2.5-2.8min/mm, atoms are rearranged and combined, the unbalanced structure is gradually changed into a balanced structure, the critical normalizing temperature is adopted, austenite grains are reduced, the low-pressure section of a quenching machine is adopted for laminar cooling after the steel plate is taken out of the furnace, the cooling speed is 1-3 ℃/S, the temperature is controlled to 580 ℃ of 560 ℃ and the lamellar spacing of pearlite can be reduced through rapid cooling, a fine ferrite and pearlite structure is obtained, the steel plate is cooled to 520 ℃ of 480 ℃ and is hoisted into a slow cooling pit for self-tempering and slow cooling for 12 h.
Further, the thickness of the steel plate for the ultra-low temperature storage tank obtained by the method is 10-150 mm.
The steel plate for the ultra-low temperature storage tank obtained by the method comprises the following chemical components in percentage by mass (unit, wt%): c: 0.12 to 0.15%, Si: 0.15 to 0.35%, Mn: 1.35-1.50%, P: less than or equal to 0.15 percent, S: not more than 0.008%, Nb 0.25-0.35%, V0.015-0.030%, Ni 0.30-0.33%, Als: 0.015-0.020%, and the balance Fe and residual elements; the carbon equivalent Ceq of the steel plate is less than or equal to 0.43, and the structure of the steel plate is fine ferrite plus pearlite.
It should be noted that the designed V element in the steel plate composition can play a role in precipitation strengthening during the self-tempering process, V is a strong carbide forming element in steel, the precipitation strengthening effect of VC and V (CN) can obviously improve the strength of steel, the high temperature resistance can be improved under high temperature and high pressure after simulated welding, and the V element grows at a very slow speed at high temperature, thereby ensuring good medium and high temperature mechanical properties of the steel plate and ensuring that the performance of the steel plate is still stable after the simulated post-welding heat treatment.
For C-Mn-Nb steel, the Nb (NC) precipitated phase in the steel is basically dissolved at 1150 ℃, and about 95 percent of Nb is dissolved in the steel in a solid way, so that austenite grains can be prevented from coarsening, therefore, in the slab heating procedure, the temperature of the preheating section is 900-.
In the rolling procedure, the initial rolling temperature of one stage is 1000-1050 ℃, the final rolling temperature is 960-1020 ℃, the steel airing thickness is more than or equal to 1.8 times of the finished product thickness, the intermediate blank is rapidly cooled in an IC to reduce the core temperature of the intermediate blank to be below the non-recrystallization temperature, a foundation is laid for accumulated deformation, grain refinement and dislocation strengthening in the finish rolling stage, the toughness is prevented from being influenced by mixed crystals, the core segregation of the steel plate is reduced, the initial rolling temperature of the second stage is less than or equal to 920 ℃, the accumulated reduction rate is controlled to be more than or equal to 50 percent by adopting multi-pass and low-reduction rolling, the steel plate is rapidly cooled in an ACC laminar cooling device, the cooling speed is controlled to be 1-3 ℃/S, and. In the finish rolling stage, the steel plate is repeatedly rolled in multiple passes under small reduction, austenite grains are lengthened and refined under continuous accumulated reduction, conditions are provided for converting the steel plate into fine ferrite, the steel plate enters an ACC laminar cooling device for rapid cooling after being rolled, the austenite grains before phase change are fully inhibited from growing large, premature precipitation of carbides in the cooling process is prevented or delayed, and the yield strength and the tensile strength of the steel plate are improved.
In the process of stacking cooling, the steel plate is subjected to ACC laminar cooling and straightening and then timely discharged and stacked for cooling, the stacking cooling temperature is more than or equal to 500 ℃, and the stacking cooling time is 36-48 h. Through the heap cold, can avoid steel sheet internal stress to come too late release to produce the internal crack, further make the inside hydrogen that has of steel sheet spill over simultaneously.
It should be noted that, when the steel grade is applied to the manufacturing process of the low-temperature storage tank, welding is needed, and the internal stress of the welded steel plate is large, which inevitably affects the stability of the operation of the equipment. Therefore, a manufacturer needs to perform simulated postweld heat treatment at 620 +/-10 ℃ for 6-12h after welding to check various properties of the steel plate, but many customers perform the simulated postweld heat treatment to reduce the yield and tensile strength of the steel plate and reduce the impact toughness, so that the steel plate cannot meet the use requirements. The reason for the failure is that the steel plate generates tempering embrittlement after being subjected to normalizing, tempering and simulated postweld heat treatment, harmful elements and alloy elements in the steel are segregated along the prior austenite grain boundary, grains in the steel become coarse, the grain boundary cohesion is reduced, the stored energy is insufficient when the simulated postweld heat treatment is carried out, the carbide precipitation ratio reaches about 80 percent, and the impact toughness is reduced.
The steel plate obtained by the scheme is subjected to normalizing, slow cooling self-tempering and simulated postweld heat treatment, the precipitation proportion of carbides in the steel is about 50%, the reserve energy before simulated postweld is large, and the qualified performance of the simulated postweld heat treatment of the steel plate can be ensured; the steel plate is cooled to 480-.
The invention has the beneficial effects that the preparation method of the 15MnNiNbDR steel plate for the ultra-low temperature storage tank successfully develops the 15MnNiNbDR steel plate for the 10-150mm low temperature storage tank with low cost, high production efficiency and excellent performance stability by reasonable component design and a series of process measures including clean steel smelting, heating, rolling, pile cooling, normalizing heat treatment, slow cooling self-tempering and the like, the yield strength and the standard ratio of the 15MnNiNbDR steel plate are rich by 40-60MPa, the tensile strength and the standard ratio of the 15MnNiNbDR steel plate are rich by 20-50MPa, the elongation and the standard ratio of the 15MnNiNbDR steel plate are controlled by 3-5%, the V-type impact power at minus 50 ℃ is 180J, the heat preservation at 620 +/-10 ℃ is carried out for 6-12h for simulating postweld heat treatment, and the performance still meets the technical requirement of the.
Detailed Description
In order to achieve the purpose, the invention is preferably designed by adopting the following components, and the chemical components (unit, wt%) in the following mass percentage are contained: c: 0.12 to 0.15%, Si: 0.15 to 0.35%, Mn: 1.35-1.50%, P: less than or equal to 0.15 percent, S: not more than 0.008%, Nb 0.25-0.35%, V0.015-0.030%, Ni 0.30-0.33%, Als: 0.015-0.020%, and the balance of Fe and residual elements, wherein the carbon equivalent Ceq of the steel 15MnNiNbDR for the low-temperature storage tank is less than or equal to 0.43.
The preparation method comprises the following steps: KR molten iron de-S, converter smelting, LF refining, VD vacuum refining, continuous casting and pouring, slab heating, rolling, stack cooling, normalizing heat treatment, slow cooling self-tempering, performance inspection, cutting and warehousing and other process control.
KR molten iron pretreatment process: the molten iron arriving at the station must be subjected to pre-slagging and post-slagging, the thickness of a slag layer on the liquid surface is ensured to be less than or equal to 25mm, the molten iron S is ensured to be less than or equal to 0.003 percent after being stirred and desulfurized by KR, the desulfurization period is ensured to be less than or equal to 20min, and the desulfurization temperature drop is ensured to be less than or equal to 20 ℃.
b. The converter smelting process comprises the following steps: the S of the molten iron entering the furnace is less than or equal to 0.003 percent, the P is less than or equal to 0.008 percent, the temperature of the molten iron is more than or equal to 1270 ℃, the loading amount of the molten iron is 100 tons, the error is controlled according to +/-1 t, high-quality plate edge materials are strictly adopted for scrap steel, light scrap briquetting is forbidden, the slagging alkalinity R is controlled according to 2.5-4.0, the tapping target P is less than or equal to 0.010 percent, the C is more than or equal to 0.05 percent, the S is less than or equal to 0.008 percent, the thickness of a slag layer is ensured to be less.
c. And an argon blowing treatment process: the argon station requires strong argon blowing for 3min, the flow rate is 200 plus 500NL/min, the diameter of the naked eye on the steel liquid surface is controlled to be 300-500 mm, and the temperature from the argon station is not lower than 1570 ℃.
And d, LF refining process: adding refined slag material, controlling alkalinity according to 4.0-5.0, adding proper amount of refined deoxidizing agent based on the oxygen content in molten steel and the condition of producing white slag, wherein the refined deoxidizing agent mainly comprises calcium carbide, aluminum particles and ferrosilicon powder. The heating process selects proper current to heat according to rhythm surplus and temperature condition, the heating time is controlled twice, the first heating is 8-13min, the second heating is 7-11min, and the deoxidizer is added according to slagging condition in the second heating process. Before leaving the station, a calcium silicate wire is added, argon is required to be closed before the calcium silicate wire is added, and the steel feeding temperature is 1610 +/-15 ℃.
e.VD refining process: VD vacuum degree must be less than 65Pa, pressure maintaining time must be more than or equal to 20min, soft blowing is carried out for 2-5min or no blowing is carried out after vacuum breaking, and molten steel cannot be exposed in the soft blowing process. Normal on-line vacuum pumping time: (molten steel temperature before vacuumizing-target leaving temperature)/1.8 min. The covering agent is ensured to be fully paved on the liquid level of the steel, the argon is required to be closed before the covering agent is added, and the steel feeding temperature is 1565 +/-15 ℃.
f. Continuous casting pouring: ensuring good condition of casting machine equipment before steel casting, wherein the superheat degree of a tundish is 15 +/-10 ℃, the drawing speed is as follows: 0.75m/min, specific water amount: 0.80L per kilogram, with electrical agitation: 850A and 10Hz, the continuous casting steel requires the whole-process protection casting, a protective tube must be sleeved within 1min after the ladle is cast, and the molten steel surface must not be red in the pouring process of the tundish. The argon blowing amount of the stopper rod is reasonably controlled in the steel casting process, and slight fluctuation of the liquid level of the crystallizer is ensured. The stacking cooling is required to be more than or equal to 24 hours after the casting blank is off-line.
g. A heating process: the heating temperature and heating time were as follows: the preheating section temperature is 900-. Therefore, in the process of heating the steel billet, under the condition of ensuring that Nb is fully dissolved in the steel, further coarsening of austenite grains is prevented, and the heating temperature of the steel billet is reasonably 1150-1200 ℃.
h. The rolling process comprises the following steps: the chemical components are combined, so that the rolling state grain refinement is ensured, the initial rolling temperature is 1000-1050 ℃, the final rolling temperature in one stage is 960-1020 ℃, the steel airing thickness is more than or equal to 1.8 times of the thickness of a finished product, the intermediate billet enters an IC for rapid cooling, and a foundation is laid for the accumulated deformation amount in the finish rolling stage, the refined grain and the dislocation reinforcement. The second-stage initial rolling temperature is less than or equal to 920 ℃, the accumulated reduction rate is more than or equal to 50%, the finish rolling adopts multi-pass and low-reduction rolling, and the repeated rolling continuously accumulates the reduction to prolong and refine austenite grains to provide conditions for converting the austenite grains into fine ferrite.
Since the slow cooling after rolling tends to grow crystal grains and the amount of alloy solid solution such as C, Mn in the structure is limited, the cooling rate is controlled appropriately. In order to obtain excellent comprehensive mechanical properties, different laminar cooling is adopted after rolling according to different plate thicknesses, the cooling speed is controlled to be 1-3 ℃/S, the steel plate enters an ACC laminar cooling device for rapid cooling after rolling, the temperature of red return is 660-680 ℃, austenite crystal grain growth before phase change is fully inhibited, premature precipitation of carbide in the cooling process is prevented or delayed, and the yield strength and the tensile strength are obviously improved.
i. Timely off-line and stacking for cooling after steel plate straightening: the heap cooling temperature is more than or equal to 500 ℃, and the heap cooling time is 36-48 h. Through the heap cold, can avoid steel sheet internal stress to come too late release to produce the internal crack, further make the inside hydrogen that has of steel sheet spill over simultaneously.
j. Normalizing heat treatment: normalizing at 860-870 ℃ for 2.5-2.8min/mm, reducing austenite grains at a critical normalizing temperature, taking out of the furnace, performing laminar cooling at 1-3 ℃/S in a low-pressure section of a quenching machine to 560-580 ℃, and reducing the lamellar spacing of pearlite through rapid cooling to obtain a fine ferrite-pearlite structure.
k. Slow cooling and self tempering: the steel plate is cooled to 480-520 ℃ and hoisted in the slow cooling pit for self-slow cooling tempering for 12h, so that the internal stress after quick cooling can be eliminated, and the self-tempering is carried out by the temperature of the core part of the steel plate, thereby promoting the precipitation strengthening of the alloy V element and further ensuring the obdurability matching.
Specific examples the compositional design is shown in the following Table (Table 1)
TABLE 115 MnNiNbDR Steel sheet chemical composition (wt%)
Remarking: ceq (%) ═ C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15
The steel plates obtained in the examples and the mechanical property tests were carried out according to GB/T3531-2014, which is shown in the following table (Table 2).
Mechanical properties of MnNiNbDR steel plate shown in Table 215
The test production of 60 batches of 10-150mm 15MnNiNbDR, all performance indexes of which meet the standard requirements and have large margin, the yield strength and the standard ratio of which are 40-60MPa, the tensile strength and the standard ratio of which are 20-50MPa, the elongation and the standard ratio margin of which are controlled to be 2-5%, the V-shaped transverse impact power at 50 ℃ below zero of 150 and 200J, heat preservation at 620 +/-10 ℃ for 12h for simulated post-weld heat treatment, and the performance still meets the technical requirements of 15 MnNiNbDR.
External inspection and flaw detection: the developed steel plate is subjected to external inspection strictly according to GB/T709-2006, the rate of qualified products is 100%, and the flaw detection is performed according to GB/T4730, wherein the proportion reaching the first level is 100%, and the expected effect is achieved.
Claims (6)
1. A preparation method of 15MnNiNbDR steel plates for ultra-low temperature storage tanks comprises KR molten iron de-S, converter smelting, LF refining, VD vacuum refining, continuous casting and pouring, slab heating, rolling, heap cooling, normalizing heat treatment, performance inspection and cutting and warehousing, and is characterized in that: a slow cooling self-tempering process is added in the normalizing heat treatment, so that the steel plate for the ultra-low temperature storage tank is subjected to simulated post-welding heat treatment at the temperature of 620 +/-10 ℃ and under the condition of heat preservation for 6-12h, and the performance of the 15MnNiNbDR technical requirement is met;
wherein the normalizing temperature is controlled at 870 ℃ of 860-.
2. The method for preparing the 15MnNiNbDR steel plate for the ultra-low temperature storage tank according to claim 1, is characterized in that: the thickness of the steel plate for the ultralow-temperature storage tank obtained by the method is 10-150 mm.
3. The method for preparing the 15MnNiNbDR steel plate for the ultra-low temperature storage tank according to claim 1, is characterized in that: the steel plate for the ultra-low temperature storage tank obtained by the method comprises the following chemical components in percentage by mass (unit, wt%): c: 0.12 to 0.15%, Si: 0.15 to 0.35%, Mn: 1.35-1.50%, P: less than or equal to 0.15 percent, S: not more than 0.008%, Nb 0.25-0.35%, V0.015-0.030%, Ni 0.30-0.33%, Als: 0.015-0.020%, and the balance Fe and residual elements; the carbon equivalent Ceq of the steel plate is less than or equal to 0.43, and the structure of the steel plate is fine ferrite plus pearlite.
4. The method for preparing the 15MnNiNbDR steel plate for the ultra-low temperature storage tank according to claim 1, is characterized in that: in the slab heating procedure, the temperature of the preheating section is 900-.
5. The method for preparing the 15MnNiNbDR steel plate for the ultra-low temperature storage tank according to claim 1, is characterized in that: in the rolling procedure, the initial rolling temperature of one stage is 1000-1050 ℃, the final rolling temperature is 960-1020 ℃, the steel airing thickness is more than or equal to 1.8 times of the thickness of a finished product, an intermediate blank enters IC for rapid cooling to lay a foundation for the accumulated deformation, grain refinement and dislocation strengthening in the finish rolling stage, the initial rolling temperature of the two stages is less than or equal to 920 ℃, multi-pass and low-pressure rolling is adopted, the accumulated reduction rate is controlled to be more than or equal to 50 percent, the steel plate enters an ACC laminar cooling device for rapid cooling after rolling is finished, the cooling speed is controlled to be 1-3 ℃/S, and the red return temperature is 660.
6. The method for preparing the 15MnNiNbDR steel plate for the ultra-low temperature storage tank according to claim 1, is characterized in that: in the heap cooling process, the steel plate is subjected to ACC laminar cooling and straightening and then timely offline heap cooling, the heap cooling temperature is more than or equal to 500 ℃, and the heap cooling time is 36-48 h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150220A (en) * | 2021-11-26 | 2022-03-08 | 湖南华菱湘潭钢铁有限公司 | Production method of low-carbon equivalent normalizing container steel plate |
| CN114317922A (en) * | 2021-12-30 | 2022-04-12 | 南阳汉冶特钢有限公司 | Control method for ensuring stable mechanical property of steam drum plate 13MnNiMoR thermal cycle process |
| CN115927953A (en) * | 2022-10-31 | 2023-04-07 | 南阳汉冶特钢有限公司 | Steel 07MnMoVR for petroleum storage tank and production method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397261A (en) * | 2013-07-31 | 2013-11-20 | 首钢总公司 | Steel plate for plastic mold for rolling continuous casting slab with thickness of 400mm and production method of steel plate |
| CN104561783A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low alloy steel 09MnNiDR steel plate for vessel and production method thereof |
| CN104561801A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Structural alloy steel 12CrMoV steel plate and production method thereof |
| CN108286013A (en) * | 2017-10-26 | 2018-07-17 | 新疆八钢铁股份有限公司 | A kind of cut deal Vessel Steels 15CrMnR steel-making continuous casting production methods |
| CN109487040A (en) * | 2018-12-06 | 2019-03-19 | 南阳汉冶特钢有限公司 | A kind of Low Alloy Steel for Pressure Vessel plate 15CrMoR and production method |
| CN109628827A (en) * | 2018-12-03 | 2019-04-16 | 南阳汉冶特钢有限公司 | A kind of low-temperature welding cracks sensibility high-strength steel plate HYQ620 and its production method |
| CN109868414A (en) * | 2019-03-12 | 2019-06-11 | 武汉钢铁有限公司 | The excellent yield strength of cold temperature impact >=430MPa pressure vessel steel and production method |
| CN111155028A (en) * | 2019-12-26 | 2020-05-15 | 张家港宏昌钢板有限公司 | Steel plate for normalized DH36 wind power and preparation method thereof |
| CN111168192A (en) * | 2020-02-20 | 2020-05-19 | 新余钢铁股份有限公司 | Hot cutting method for high-hardness wear-resistant steel plate with thickness of 50-80 mm |
| CN111607748A (en) * | 2020-05-15 | 2020-09-01 | 江阴兴澄特种钢铁有限公司 | High-flatness large-thickness lamellar tearing resistant 780CF-Z35 hydroelectric steel and manufacturing method thereof |
-
2020
- 2020-11-24 CN CN202011333308.XA patent/CN112575255A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397261A (en) * | 2013-07-31 | 2013-11-20 | 首钢总公司 | Steel plate for plastic mold for rolling continuous casting slab with thickness of 400mm and production method of steel plate |
| CN104561783A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low alloy steel 09MnNiDR steel plate for vessel and production method thereof |
| CN104561801A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Structural alloy steel 12CrMoV steel plate and production method thereof |
| CN108286013A (en) * | 2017-10-26 | 2018-07-17 | 新疆八钢铁股份有限公司 | A kind of cut deal Vessel Steels 15CrMnR steel-making continuous casting production methods |
| CN109628827A (en) * | 2018-12-03 | 2019-04-16 | 南阳汉冶特钢有限公司 | A kind of low-temperature welding cracks sensibility high-strength steel plate HYQ620 and its production method |
| CN109487040A (en) * | 2018-12-06 | 2019-03-19 | 南阳汉冶特钢有限公司 | A kind of Low Alloy Steel for Pressure Vessel plate 15CrMoR and production method |
| CN109868414A (en) * | 2019-03-12 | 2019-06-11 | 武汉钢铁有限公司 | The excellent yield strength of cold temperature impact >=430MPa pressure vessel steel and production method |
| CN111155028A (en) * | 2019-12-26 | 2020-05-15 | 张家港宏昌钢板有限公司 | Steel plate for normalized DH36 wind power and preparation method thereof |
| CN111168192A (en) * | 2020-02-20 | 2020-05-19 | 新余钢铁股份有限公司 | Hot cutting method for high-hardness wear-resistant steel plate with thickness of 50-80 mm |
| CN111607748A (en) * | 2020-05-15 | 2020-09-01 | 江阴兴澄特种钢铁有限公司 | High-flatness large-thickness lamellar tearing resistant 780CF-Z35 hydroelectric steel and manufacturing method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 丁健等: "丙烯球罐用调质板07MnNiMoDR的研发", 《轧钢》 * |
| 于建波，曹毅杰主编: "《金属材料与热处理习题与学习指导 第2版》", 30 November 2012, 北京：北京理工大学出版社 * |
| 康永林，孙建林等编著: "《轧制工程学 第2版》", 30 September 2014, 北京：冶金工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150220A (en) * | 2021-11-26 | 2022-03-08 | 湖南华菱湘潭钢铁有限公司 | Production method of low-carbon equivalent normalizing container steel plate |
| CN114317922A (en) * | 2021-12-30 | 2022-04-12 | 南阳汉冶特钢有限公司 | Control method for ensuring stable mechanical property of steam drum plate 13MnNiMoR thermal cycle process |
| CN115927953A (en) * | 2022-10-31 | 2023-04-07 | 南阳汉冶特钢有限公司 | Steel 07MnMoVR for petroleum storage tank and production method thereof |
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