CN104711479A - Alloy steel plate for pressure vessel and manufacturing method of alloy steel plate - Google Patents
Alloy steel plate for pressure vessel and manufacturing method of alloy steel plate Download PDFInfo
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- CN104711479A CN104711479A CN201510126787.0A CN201510126787A CN104711479A CN 104711479 A CN104711479 A CN 104711479A CN 201510126787 A CN201510126787 A CN 201510126787A CN 104711479 A CN104711479 A CN 104711479A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- 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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- 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
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Abstract
The invention relates to an alloy steel plate for a pressure vessel and a manufacturing method of the alloy steel plate. The alloy steel plate comprises the following components in percentage by weight: 0.21-0.24 percent of carbon, 0.75-0.95 percent of silicon, 1.25-1.35 percent of manganese, 0-0.020 percent of phosphorus, 0-0.010 percent of sulfur, 0.40-0.55 percent of chromium and ferrum and inevitable impurities in balancing mount. The alloy steel plate is produced by top and bottom combined blown converter smelting, LF+VD or RH external refining, slab continuous casting, slab reheating, slab rolling and other processes. The yield strength of the alloy steel plate is greater than or equal to 325MPa, the tensile strength is s greater than or equal to 585MPa, the yield ratio is less than or equal to 0.75, and the high-temperature performance Rp0.2 at 350DEG C is great than or equal to 220MPa. The alloy steel plate has the advantages of high strength, low yield ratio, favorable high-temperature performance, favorable welding performance and the like; and the using safety of the pressure vessel made of the alloy steel plate in a high-temperature environment is guaranteed.
Description
Technical field
The invention belongs to the technical field that metallic substance manufactures, especially relate to a kind of pressurized vessel alloy steel plate and manufacture method thereof.
Background technology
Along with the fast development of national economy, the technology such as generating, metallurgy, chemical industry, food, papermaking improves constantly, and the demand of high temperature material significantly increases, and the demand of the pressurized vessel alloy steel plate particularly used in high temperature environments is increasing.
Steel plate uses for a long time in hot environment, requires that steel plate will have higher high temperature resistant creep rupture strength and rupture ductility, good antioxidant property and corrosion resistance, and enough toughness, workability, weldability and structure stability.
In order to solve the problem, generally adopt at present and add the precious alloys such as Cr, Mo, Ni, V in steel, and addition is larger, as 12Cr1MoVR, 12Cr2Mo1R etc. in GB713, alloy content is comparatively large, and the tissue of As rolled is unstable, therefore these steel plates also need to carry out subsequent heat treatment, as normalizing, normalizing+tempering etc., production technique is many, and cost is high.And alloy content is large, Plate Welding needs preheating, and easily produces welding flaw.
Pressurized vessel generally uses in the environment such as High Temperature High Pressure, and security requirement is higher.Lower yield tensile ratio, is not only conducive to improving plasticity, and is conducive to ensureing the security in use.
Yield tensile ratio is lower, material from deformation quantity required for viscous deformation to final fracture larger, thus improve its plastic deformation ability, can effectively alleviate the stress concentration produced because of overload, otherwise if yield tensile ratio is too high, the overload unstability caused due to local gross distortion can be caused.From this angle, yield tensile ratio is lower safer.But yield tensile ratio is too low will certainly lose intensity, causes waste of material.
The chemical composition of steel directly affects the application performance of final steel product, rational element proportioning to improve steel toughness, reduce yield tensile ratio, improve weldability and play an important role.Adopt low-carbon high-manganese to be conducive to ensureing intensity and the welding property of steel when chemical composition design, and add the alloying element such as the addition of C r, Nb, Mo, Ni, V can form carbon and nitrogen compound in steel, by dissolving and separating out the effect that mechanism plays inhibiting grain growth and precipitation strength.But the interpolation of alloying element can improve carbon equivalent and welding crack Sensitivity Index, has a negative impact to welding property.Therefore, conservative control alloying element to improve steel performance, reduce production cost extremely important.
Histioid steel easily obtains high yield strength and tensile strength, but both differences are little usually, and therefore yield tensile ratio is relatively high.Result of study shows, if there is the phase of two or more varying strengths in tissue, softly in plastic history first to surrender mutually, firmly in further deformation process can improve tensile strength mutually, make that the yield strength of steel is lower and tensile strength is higher, yield tensile ratio is lower.Common heterogeneous structure has ferrite ten bainite, ferrite ten M/A, bainite ten martensite etc., and intensity is determined jointly by the intensity of each constituent element phase and content.
Summary of the invention
The object of the present invention is to provide a kind of pressurized vessel alloy steel plate, adopt C, Si, Mn, Cr Composition Design, adopt top and bottom combined blown converter smelting, the explained hereafter such as LF+VD or RH external refining, sheet billet continuous casting, slab reheat, slab rolling, make steel plate yield strength>=325MPa, tensile strength>=585MPa, yield tensile ratio≤0.75,350 DEG C of high-temperature behavior R
p0.2>=220MPa.This steel plate has higher intensity, lower yield tensile ratio, good high-temperature behavior and welding property etc., ensure that the security that the pressurized vessel of steel plate manufacture uses in hot environment.
Technical scheme of the present invention is:
A kind of pressurized vessel alloy steel plate, steel plate comprises the following component of weight percent meter: carbon 0.21 ~ 0.24%, silicon 0.75 ~ 0.95%, manganese 1.25 ~ 1.35%, phosphorus≤0.020%, sulphur≤0.010%, chromium 0.40 ~ 0.55%, surplus is iron and inevitable impurity.
C: make a significant impact the intensity of steel, welding property, carbon improves 4 times that tensile strength is yield strength, is conducive to the yield tensile ratio reducing steel.In the present invention, C is 0.21 ~ 0.24%.
Mn: add in steel as deoxidant element and alloying element, the sulfide in it and steel, oxide compound generate manganese sulfide (MnS), manganese oxide (MnO).Their easily float and are excluded, and what thus eliminate that FeS and FeO cause is hot-short, improves the hot workability of structure iron, also can reduce cold shortness simultaneously.Manganese dissolves in ferrite (α-Fe), dissolves in again in cementite and forms carbide [Mn3C; (Fe, Mn) 3], increase the intensity of steel.Mn reduces the transition temperature of γ-α, add the nucleation rate of α during phase transformation, refinement ferrite and pearlite crystal grain; Manganese can expand γ district and (often increase 1%Mn, Ar3 point approximately reduces by 70 DEG C, Ar1 point reduction by 50 DEG C), make the thermoplasticity processing temperature range extension of steel, be conducive to the enforcement (increase cold zone cumulative deformation and reduce finishing temperature and make the further refinement of ferrite crystal grain) of Controlling Technology.But manganese is also the element increasing carbon equivalent, too high, is unfavorable for welding.Mn:1.25 ~ 1.35% of the present invention.
Si: the avidity of silicon and oxygen is very strong, does not form carbide, but be present in ferrite with the form of sosoloid in steel.Silicone content >=0.50%, as alloying element, can significantly improve the tensile strength of steel and comparatively significantly improve yield strength, and elastic limit is improved more, silicon and chromium combine, and can improve resistance to corrosion and oxidation-resistance property.Si:0.75 ~ 0.95% of the present invention.
Cr: chromium and iron form continuous solid solution, form multiple carbide with carbon, the impact for the heat resistance of steel is that it also can strengthen αsolidsolution, changes Carbide Precipitation shape and type.As effective solution strengthening element, the intensity of grain boundary area will be improved.The carbide of chromium has very high corrosion stability, and chromium can improve the intensity of steel and hardness and reduce elongation, and unfavorable to impact value, impact value reduces with the increase of chromium content.Chromium can improve resistance of oxidation and the resistance to corrosion of steel.Cr:0.40 ~ 0.55% of the present invention.
The elements such as S, P should strictly control its content, avoid causing macrosegregation, to improve toughness, the cold-forming property and welding property etc. of steel.P≤0.020% of the present invention, S≤0.010%
The present invention is on above-mentioned chemical composition design basis, in order to make steel plate, there is higher intensity, lower yield tensile ratio, good high-temperature behavior, adopt top and bottom combined blown converter smelting, LF+VD or RH external refining, sheet billet continuous casting, slab reheat, the explained hereafter such as slab rolling.
Adopt top and bottom combined blown converter smelting, basicity 3.0 ~ 3.5, terminal target: C is 0.06% ~ 0.10%, P≤0.010%, S≤0.008%.Scum rod, floating plug pushing off the slag is added, strict control converter slag during tapping.Tapping time >=4 minutes, ensure steel ladle full Argon in tapping process.Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime, fluorite in tapping process.Tap complete, in Argon >=10, CAS station minute (containing tapping Argon), feed aluminum steel 1.6m/t.
Adopt LF+VD or RH external refining.White slag process is made in LF refining, VD or RH protects vacuum time 15 ~ 20 minutes.Pure degassing time 15 ~ 20 minutes.Feed calcium line 1.2m/t, soft blow time >=15 minutes.
Adopt sheet billet continuous casting, in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution, and static two cold water distributions adopt weak cold, and use medium carbon alloy steel covering slag, middle bag uses low-carbon (LC) alkaline covering agent.Slab pulling rate 0.9 ~ 1.2m/min, tundish superheating temperature 15 ~ 25 DEG C.
Slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1130 ~ 1180 DEG C.
Slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, and adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 870 ~ 900 DEG C, after rolling, the relaxation dead time controls, at 20 ~ 30s, to cool fast after relaxation, speed of cooling 10 ~ 25 DEG C/s.
Strict rolling temperature control.This steel plate requires that in tissue, soft phase constitution ferrite and hard phase constitution bainite exist by a certain percentage simultaneously, and the fluctuation of finishing temperature is very big to the scale effect of soft, hard phase constitution, need by finishing temperature control in minimum temperature range.According to the good practical experience of Theoretical Calculation, finishing temperature of the present invention is 870 ~ 900 DEG C.
Lowly by force require to exist the soft phase constitution of a certain proportion of ferrite than steel plate, before roller repairing, therefore need enough dead times to ensure the formation of ferritic structure.Groped by test of many times, finally determine that rolling the rear relaxation dead time controls at 20 ~ 30s, the ratio of soft or hard phase constitution after control steel plate water-cooled.
The present invention adopts C, Si, Mn, Cr Composition Design, considerably reduce precious alloy content, cancel subsequent heat treatment, decrease process procedure, reduce cost, not only ensure that normal-temperature high-strength degree, high-temperature behavior requirement, also effectively reduce yield tensile ratio, improve the security that steel plate uses in hot environment.
Beneficial effect of the present invention is: the invention discloses a kind of pressurized vessel alloy steel plate and manufacture method thereof.The present invention has higher intensity, lower yield tensile ratio, good high-temperature behavior and welding property etc., there are higher high temperature resistant creep rupture strength and rupture ductility, good antioxidant property, the ability of resistance to certain dielectric corrosion, and enough toughness, cold and hot working, weldability and structure stability, thus ensure that the security that steel plate uses in hot environment.Manufacture method of the present invention, under existing installation condition, adopt converter smelting, smelting process strictly controls non-metallic inclusion, achieves the production of Clean Steel.Pressurized vessel alloy steel plate of the present invention, yield strength>=325MPa, tensile strength>=585MPa, yield tensile ratio≤0.75,350 DEG C of high-temperature behavior R
p0.2>=220MPa.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention will be more clear along with description.But embodiment is only exemplary, does not form any restriction to scope of the present invention.It will be understood by those skilled in the art that and can modify to the details of technical solution of the present invention and form or replace down without departing from the spirit and scope of the present invention, but these amendments and replacement all fall within the scope of protection of the present invention
.
Embodiment 1: produce pressurized vessel alloy steel plate, its thickness is 50mm
1. chemical composition is (weight percentage): carbon (C) 0.24%, silicon (Si) 0.90%, manganese (Mn) 1.35%, phosphorus (P) 0.012%, sulphur (S) 0.003%, chromium (Cr) 0.55%, and surplus is iron and inevitable impurity.
2. preparation technology:
Adopt top and bottom combined blown converter smelting, LF+VD or RH external refining, sheet billet continuous casting, slab reheat, the explained hereafter such as slab rolling.
Adopt top and bottom combined blown converter smelting, basicity 3.5, terminal target: C:0.09%, P:0.010%, S:0.008%.Scum rod, floating plug pushing off the slag is added, strict control converter slag during tapping.6 minutes tapping time, in tapping process, ensure steel ladle full Argon.Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime 810 ㎏, fluorite 260kg in tapping process.Tap complete, in CAS station Argon 15 minutes (containing tapping Argon), feed aluminum steel 1.6m/t.
Adopt LF+VD or RH external refining.White slag process is made in LF refining, VD or RH protects vacuum time 20 minutes.Pure degassing time 20 minutes.Feed calcium line 1.2m/t, 20 minutes soft blow time.
Adopt sheet billet continuous casting, in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution, and static two cold water distributions adopt weak cold, and use medium carbon alloy steel covering slag, middle bag uses low-carbon (LC) alkaline covering agent.Slab pulling rate 1.1m/min, tundish superheating temperature 25 DEG C.
Slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1160 DEG C.
Slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, and adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 880 DEG C, after rolling, the relaxation dead time controls, at 30s, to cool fast after relaxation, speed of cooling 10 DEG C/s.
3, to the Performance Detection of the production pressurized vessel alloy steel plate of this enforcement preparation
Yield strength 400MPa, tensile strength 650MPa, yield tensile ratio 0.60,350 DEG C of high-temperature behavior R
p0.2245MPa.
Embodiment 2: produce pressurized vessel alloy steel plate, its thickness is 20mm
1. the chemical composition of steel plate is (weight percentage): carbon (C) 0.23%, silicon (Si) 0.80%, manganese (Mn) 1.30%, phosphorus (P) 0.013%, sulphur (S) 0.005%, chromium (Cr) 0.50%, and surplus is iron and inevitable impurity,
2. preparation technology:
Adopt top and bottom combined blown converter smelting, LF+VD or RH external refining, sheet billet continuous casting, slab reheat, the explained hereafter such as slab rolling.
Adopt top and bottom combined blown converter smelting, basicity 3.2, terminal target: C:0.10%, P:0.009%, S:0.006%.Scum rod, floating plug pushing off the slag is added, strict control converter slag during tapping.6 minutes tapping time, in tapping process, ensure steel ladle full Argon.Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime 800 ㎏, fluorite 260kg in tapping process.Tap complete, in CAS station Argon 18 minutes (containing tapping Argon), feed aluminum steel 1.6m/t.
Adopt LF+VD or RH external refining.White slag process is made in LF refining, VD or RH protects vacuum time 17 minutes.Pure degassing time 17 minutes.Feed calcium line 1.2m/t, 19 minutes soft blow time.
Adopt sheet billet continuous casting, in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution, and static two cold water distributions adopt weak cold, and use medium carbon alloy steel covering slag, middle bag uses low-carbon (LC) alkaline covering agent.Slab pulling rate 1.0m/min, tundish superheating temperature 23 DEG C.
Slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1180 DEG C.
Slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, and adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 900 DEG C, after rolling, the relaxation dead time controls, at 26s, to cool fast after relaxation, speed of cooling 18 DEG C/s.
3, to the Performance Detection of the production pressurized vessel alloy steel plate of this enforcement preparation
Yield strength 430MPa, tensile strength 680MPa, yield tensile ratio 0.62,350 DEG C of high-temperature behavior R
p0.2265MPa.
Embodiment 3: produce pressurized vessel alloy steel plate, its thickness is 6mm
1. the chemical composition of steel plate is (weight percentage): carbon (C) 0.21%, silicon (Si) 0.75%, manganese (Mn) 1.25%, phosphorus (P) 0.013%, sulphur (S) 0.004%, chromium (Cr) 0.40%, and surplus is iron and inevitable impurity,
2. preparation technology:
Adopt top and bottom combined blown converter smelting, LF+VD or RH external refining, sheet billet continuous casting, slab reheat, the explained hereafter such as slab rolling.
Adopt top and bottom combined blown converter smelting, basicity 3.0, terminal target: C:0.06%, P:0.008%, S:0.005%.Scum rod, floating plug pushing off the slag is added, strict control converter slag during tapping.4 minutes tapping time, in tapping process, ensure steel ladle full Argon.Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime 800 ㎏, fluorite 260kg in tapping process.Tap complete, in CAS station Argon 10 minutes (containing tapping Argon), feed aluminum steel 1.6m/t.
Adopt LF+VD or RH external refining.White slag process is made in LF refining, VD or RH protects vacuum time 15 minutes.Pure degassing time 15 minutes.Feed calcium line 1.2m/t, 15 minutes soft blow time.
Adopt sheet billet continuous casting, in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution, and static two cold water distributions adopt weak cold, and use medium carbon alloy steel covering slag, middle bag uses low-carbon (LC) alkaline covering agent.Slab pulling rate 0.9m/min, tundish superheating temperature 15 DEG C.
Slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1130 DEG C.
Slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, and adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 870 DEG C, after rolling, the relaxation dead time controls, at 20s, to cool fast after relaxation, speed of cooling 25 DEG C/s.
3, to the Performance Detection of the production pressurized vessel alloy steel plate of this enforcement preparation
Yield strength 420MPa, tensile strength 705Pa, yield tensile ratio 0.59,350 DEG C of high-temperature behavior R
p0.2280MPa.
Embodiment 4: produce pressurized vessel alloy steel plate, its thickness is 36mm
1. the chemical composition of steel plate is (weight percentage): carbon (C) 0.22%, silicon (Si) 0.85%, manganese (Mn) 1.31%, phosphorus (P) 0.015%, sulphur (S) 0.004%, chromium (Cr) 0.52%, and surplus is iron and inevitable impurity,
2. preparation technology:
Adopt top and bottom combined blown converter smelting, LF+VD or RH external refining, sheet billet continuous casting, slab reheat, the explained hereafter such as slab rolling.
Adopt top and bottom combined blown converter smelting, basicity 3.3, terminal target: C:0.08%, P:0.007%, S:0.007%.Scum rod, floating plug pushing off the slag is added, strict control converter slag during tapping.5 minutes tapping time, in tapping process, ensure steel ladle full Argon.Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime 800 ㎏, fluorite 260kg in tapping process.Tap complete, in CAS station Argon 16 minutes (containing tapping Argon), feed aluminum steel 1.6m/t.
Adopt LF+VD or RH external refining.White slag process is made in LF refining, VD or RH protects vacuum time 16 minutes.Pure degassing time 16 minutes.Feed calcium line 1.2m/t, 18 minutes soft blow time.
Adopt sheet billet continuous casting, in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution, and static two cold water distributions adopt weak cold, and use medium carbon alloy steel covering slag, middle bag uses low-carbon (LC) alkaline covering agent.Slab pulling rate 1.0m/min, tundish superheating temperature 20 DEG C.
Slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1158 DEG C.
Slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, and adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 900 DEG C, after rolling, the relaxation dead time controls, at 28s, to cool fast after relaxation, speed of cooling 17 DEG C/s.
3, to the Performance Detection of the production pressurized vessel alloy steel plate of this enforcement preparation
Yield strength 403MPa, tensile strength 692Pa, yield tensile ratio 0.58,350 DEG C of high-temperature behavior R
p0.2284MPa.
Claims (8)
1. a pressurized vessel alloy steel plate, it is characterized in that, described alloy steel plate comprises the following component of weight percent meter: carbon 0.21 ~ 0.24%, silicon 0.75 ~ 0.95%, manganese 1.25 ~ 1.35%, phosphorus≤0.020%, sulphur≤0.010%, chromium 0.40 ~ 0.55%, surplus is iron and inevitable impurity.
2. a manufacture method for pressurized vessel alloy steel plate as claimed in claim 1, is characterized in that: adopt converter smelting, the explained hereafter such as LF+VD or RH external refining, sheet billet continuous casting, slab reheat, slab rolling.
3. the manufacture method of pressurized vessel alloy steel plate according to claim 2, is characterized in that: adopt top and bottom combined blown converter smelting, basicity 3.0 ~ 3.5, terminal target: C is 0.06% ~ 0.10%, P≤0.010%, S≤0.008%; Scum rod, floating plug pushing off the slag is added during tapping; Tapping time >=4 minutes, ensure steel ladle full Argon in tapping process; Deoxidation alloying: alloy adds before tapping 4/5, adds small-particle lime, fluorite in tapping process; Tap complete, in Argon >=10 minute, CAS station, feed aluminum steel 1.6m/t.
4. the manufacture method of pressurized vessel alloy steel plate according to claim 2, is characterized in that: adopt LF+VD or RH external refining; White slag process is made in LF refining, VD or RH protects vacuum time 15 ~ 20 minutes, pure degassing time 15 ~ 20 minutes, feeds calcium line 1.2m/t, soft blow time >=15 minutes.
5. the manufacture method of pressurized vessel alloy steel plate according to claim 2; it is characterized in that: adopt sheet billet continuous casting; in casting process, dynamic secondary cooling water distribution adopts AmedC water distribution; static two cold water distributions adopt weak cold; use medium carbon alloy steel covering slag; middle bag uses low-carbon (LC) alkaline covering agent, slab pulling rate 0.9 ~ 1.2m/min, tundish superheating temperature 15 ~ 25 DEG C.
6. the manufacture method of pressurized vessel alloy steel plate according to claim 2, is characterized in that: slab reheats, and heat-up time, 8min/cm, heated rear tapping temperature 1130 ~ 1180 DEG C.
7. the manufacture method of pressurized vessel alloy steel plate according to claim 2, it is characterized in that: slab rolling, heating of plate blank is come out of the stove the dephosphorization of laggard horizontal high voltage water, adopt roughing and finish rolling two-phase control rolling, finish rolling finishing temperature 870 DEG C ~ 900 DEG C, after rolling, relaxation dead time 20 ~ 30s, cools after relaxation fast, speed of cooling 10 ~ 25 DEG C/s.
8. pressurized vessel alloy steel plate according to claim 1, is characterized in that, the thickness≤50mm of described alloy steel plate.
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| CN115233102A (en) * | 2022-07-26 | 2022-10-25 | 张家港宏昌钢板有限公司 | Low-yield-ratio high-strength steel plate and production method thereof |
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| CN105177452A (en) * | 2015-09-08 | 2015-12-23 | 山东钢铁股份有限公司 | Alloy steel plate for pressure container and preparation method thereof |
| CN105177452B (en) * | 2015-09-08 | 2017-03-22 | 山东钢铁股份有限公司 | Alloy steel plate for pressure container and preparation method thereof |
| CN106011594A (en) * | 2016-07-08 | 2016-10-12 | 首钢总公司 | Method for smelting hydrogen crack resisting container steel with yield level being 245 MPa |
| CN106011594B (en) * | 2016-07-08 | 2017-09-29 | 首钢总公司 | A kind of smelting process of the anti-hydrogen induced cracking container steel of 245MPa grades of surrender |
| CN107570536A (en) * | 2017-09-15 | 2018-01-12 | 首钢集团有限公司 | A kind of method of TMCP bridge steel plates plate shape control |
| CN115233102A (en) * | 2022-07-26 | 2022-10-25 | 张家港宏昌钢板有限公司 | Low-yield-ratio high-strength steel plate and production method thereof |
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