CN117431471A - Preparation method of hull steel with high collision resistance - Google Patents
Preparation method of hull steel with high collision resistance Download PDFInfo
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- CN117431471A CN117431471A CN202311405047.1A CN202311405047A CN117431471A CN 117431471 A CN117431471 A CN 117431471A CN 202311405047 A CN202311405047 A CN 202311405047A CN 117431471 A CN117431471 A CN 117431471A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001562 pearlite Inorganic materials 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 abstract description 8
- 229910000746 Structural steel Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical group CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 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
- C22C38/18—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
- 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
- C21D8/0221—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
- 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
- C22C38/06—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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a preparation method of hull steel with high collision resistance, which comprises the following chemical components in percentage by mass: c:0.03 to 0.05 percent, si:0.25 to 0.35 percent, mn:1.30 to 1.40 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.005 percent, nb:0.03 to 0.04 percent of Ti:0.008 to 0.02 percent of Al:0.015 to 0.05 percent, cr:0.20 to 0.30 percent, ni:0.30 to 0.40 percent, and the balance of Fe and unavoidable impurities; the key preparation steps comprise: smelting, continuous casting, heating, rolling, cooling and heat treatment. The hull structural steel has good toughness, yield strength of not less than 315Mpa, tensile strength of 450-570Mpa and impact energy of minus 40 ℃ of not less than 200J, and the elongation of the steel plate can reach 45% and above, has very good anti-collision performance, and can better meet the anti-collision requirements of military and civil ships.
Description
Technical Field
The invention belongs to the field of steel material preparation, and relates to a preparation method of hull steel with high collision resistance.
Technical Field
In recent years, with the rapid development of global economy and ocean trade, marine accidents have increased year by year. It is counted that 51% or more of marine accidents of ships are caused by collisions, contact, stranding, and the like. As a countermeasure for ships, some tankers secure the safety of ships by means of a double hull structure (double hull) and a space for oil-carrying tanks left from the side of the hull. However, the difficulty and cost of ship construction are increased due to the reduction of propulsion efficiency and load capacity, which is not beneficial to popularization and application. Part of the classification society and the marine society in recent years have attempted to use high ductility steel plates to promote the collision resistance of ships.
The traditional medium plate material adopts two-stage rolling to carry out processing strengthening to obtain high strength and high toughness, and meanwhile, the expansion limit can be reduced along with the increase of the strength. Therefore, the elongation of the general high-strength ship plate is difficult to reach more than 35%, and the ship steel plate is extremely easy to break in the collision process, so that the marine perils are caused. At present, the related patents for improving the collision resistance of the steel plate are not many, and most of the patents are hot continuous rolling or cold rolling sheets of automobile steel, and the method for improving the ductility of the medium plate by adopting rolling and normalizing heat treatment is not reported.
Disclosure of Invention
The invention aims to provide a preparation method of hull steel with high collision resistance, wherein the strength level is 32 kg, and the specific elongation is more than or equal to 45 percent, and the hull steel has high collision resistance.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the steel comprises the chemical components of C=0.03-0.05 wt%, si=0.25-0.35 wt%, mn=1.30-1.40 wt%, P is less than or equal to 0.015 wt%, S is less than or equal to 0.005 wt%, nb=0.03-0.04 wt%, ti=0.008-0.02 wt%, al=0.015-0.05 wt%, cr=0.20-0.30 wt%, ni=0.30-0.40 wt%, and Fe and inevitable impurity elements for the rest; the key preparation steps comprise: smelting the components by adopting a converter and casting the components into billets; heating the billet and performing two-stage rolling, wherein the heating temperature is controlled to be 1150-1200 ℃, the finishing temperature of rough rolling is more than or equal to 1000 ℃, the ratio of the thickness of the billet to the thickness of a final product when the rolling temperature is lower than Tnr ℃ during finish rolling is more than or equal to 4:1, and the finishing temperature of finish rolling is 10-30 ℃ above Ar 3; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880+/-10 ℃, the normalizing time is 2.0-2.5 min/mm multiplied by the thickness of the plate, the thickness of the hull steel with high collision resistance is 10-50 mm, the yield strength is more than or equal to 315Mpa, the tensile strength is 450-570Mpa, the impact energy at-40 ℃ is more than or equal to 200J, the elongation after the tensile fracture of the steel plate is more than or equal to 45%, the metallographic structure is ferrite plus a small amount of dispersed pearlite, and the grain size is 10-12 grade.
The Tnr is the recrystallization temperature, and the professional general calculation formula is as follows
Tnr＝887+464×C+890×Ti+363×Al-357×Si+6445×(Nb×0.75)
-644×[Sqrt(Nb×0.75)]+[732×V-230×(Sqrt(V)]；
Ar3 is the phase transition starting temperature of the steel plate during cooling, and a professional general calculation formula is as follows
Ar3 = {1670-558× [ C+ (Mn+Mo)/(3.875+Cu +.15.5+Cr +.20.67+Ni +. 5.636] +16× [ (H +.25.4) -0.315] -32} ×5 +.9, where the element symbols represent the mass percent of the element in units of; h represents the thickness of the finished steel sheet in mm.
The principle of the invention is as follows:
the hard phase pearlite structure in the steel is reduced through the component design of ultra-low carbon and high manganese; the method comprises the steps of expanding non-recrystallized regions of austenite in the rolling process of niobium-titanium microalloying, rolling and flattening original austenite grains through a large compression ratio of the non-recrystallized regions, precisely controlling the final rolling temperature and the final cooling temperature, and reserving long and thin austenite grain boundaries in a rolled state; and finally, austenite grains are preferentially formed in a rolled grain boundary in the normalizing process, carbon fixation, solid solution strengthening and austenite grain refinement effects in the normalizing process are ensured through the composite addition of alloy elements chromium and nickel and the inheritance of a rolled slender austenite grain boundary structure, uniform refinement of ferrite grains transformed after air cooling is realized, carbide is dispersed and distributed, and the toughness and the ductility of the steel plate are improved.
The invention has the beneficial effects that: the high-collision-resistance steel plate is higher than the specified value of the elongation after breaking by more than 20 percent than the conventional steel plate, and has higher capability of resisting the rupture and cracking of the ship body due to the excellent ductility when the ship body collides or is in reef contact, so that the steel plate can inhibit the outflow of cargoes and fuel oil, prevent marine pollution and the sinking of the ship body, and realize safer and more reliable marine transportation.
Drawings
FIG. 1 is a photograph showing the metallographic structure of a steel plate according to the embodiment 1 of the present invention;
FIG. 2 is a photograph showing the metallographic structure of the steel sheet of comparative example 1 of the present invention.
Detailed Description
According to the preparation method of the hull steel with high collision resistance, provided by the invention, a continuous casting blank with 220-350 mm is cast through 120t converter smelting, LF furnace refining and RH furnace vacuum treatment, then rolled into the thickness of a finished product on a five-meter double-rack medium plate production line, and finally normalizing heat treatment is carried out in a radiant tube type heating normalizing furnace. The present invention is further illustrated by the following examples and comparative examples. The key process parameters for the example and comparative steel sheets are as follows.
Example 1
A preparation of hull steel with high collision resistance, wherein the thickness of a steel plate is 30mm, and the thickness of a continuous casting billet is 300mm. Tnr is 881℃and Ar3 is 772℃calculated from the chemical composition. Two-stage rolling is carried out after heating, the heating temperature is 1182 ℃, the rolling is directly carried out after discharging, the rough rolling finishing temperature is 1026 ℃, the intermediate billet is 130mm, the finish rolling starting temperature is 830 ℃, the ratio of the thickness of a plate blank to the thickness of a final finished product when the rolling temperature during finish rolling is lower than 881 ℃ is 4.33:1, and the finishing temperature is 786 ℃; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880 ℃, and the normalizing time is 60min.
Comparative example 1
The comparative example is ocean engineering steel EH32 with normalizing technology, the thickness of the steel plate is 30mm, and the thickness of the continuous casting billet is 300mm; tnr is 923 ℃ and Ar3 is 756 ℃ calculated by a formula; two-stage rolling is carried out after heating, the heating temperature is 1180 ℃, the rolling is directly carried out after discharging, the rough rolling finishing temperature is 1032 ℃, the intermediate billet is 130mm, the finish rolling starting temperature is 820 ℃, the ratio of the thickness of a plate blank to the thickness of a final finished product when the rolling temperature during finish rolling is lower than 923 ℃ is 4.33:1, and the finishing temperature is 774 ℃; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880 ℃, and the normalizing time is 60min.
Example 2
The hull steel with high collision resistance is prepared with steel plate thickness of 10mm and continuous casting thickness of 220mm. Tnr was calculated from the chemical composition to be 907℃and Ar3 was calculated to be 765 ℃. Heating, then carrying out two-stage rolling, wherein the heating temperature is 1195 ℃, directly rolling after discharging, the rough rolling finishing temperature is 1059 ℃, the intermediate billet is 80mm, the finish rolling starting temperature is 920 ℃, the finish rolling is 9 times, the first rolling is completed, the temperature of a plate blank is 901 ℃, the thickness of the plate blank is 67.8mm, the ratio of the thickness of the plate blank to the thickness of a final finished product is 6.78:1 when the rolling temperature during finish rolling is lower than 907 ℃, the rolling is continued for the rest 8 times, and the finishing temperature is 778 ℃; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880 ℃, and the normalizing time is 25min.
Comparative example 2
The comparative example is a common ship steel, the thickness of the steel plate is 10mm, and the thickness of the continuous casting billet is 220mm. Tnr was calculated from the chemical composition to be 907℃and Ar3 was calculated to be 765 ℃. Performing two-stage rolling after heating, wherein the heating temperature is 1178 ℃, the rolling is directly performed after discharging, the rough rolling finish rolling temperature is 1062 ℃, the intermediate billet is 80mm, the finish rolling start rolling temperature is 920 ℃, the finish rolling is 9 times, the first rolling is completed, the temperature of a plate blank is 903 ℃, the thickness of the plate blank is 67.6mm, the ratio of the thickness of the plate blank to the thickness of a final finished product is 6.76:1 when the rolling temperature during finish rolling is lower than 907 ℃, the rolling is continued for the rest 8 times, and the finish rolling temperature is 780 ℃; air cooling to room temperature after rolling, and then carrying out no normalizing heat treatment.
Example 3
The hull steel with high collision resistance is prepared with steel plate of 50mm thickness and continuous casting blank of 350mm thickness. Tnr was calculated from the chemical composition to be 879℃and Ar3 was calculated to be 789 ℃. Two-stage rolling is carried out after heating, the heating temperature is 1189 ℃, the rolling is directly carried out after discharging, the rough rolling finishing temperature is 1023 ℃, the intermediate billet is 200mm, the finish rolling starting temperature is 820 ℃, the ratio of the thickness of a plate blank to the thickness of a final finished product when the rolling temperature during finish rolling is lower than 879 ℃ is 4:1, and the finishing temperature is 796 ℃; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880 ℃, and the normalizing time is 100min.
Comparative example 3
The comparative example is TMCP process boat plate EH32, the thickness of the steel plate is 50mm, and the thickness of the continuous casting billet is 350mm. Two-stage rolling is carried out after heating, the heating temperature is 1186 ℃, the rolling is directly carried out after discharging, the rough rolling finish rolling temperature is 1011 ℃, the intermediate billet is 120mm, the finish rolling start rolling temperature is 840 ℃, and the finish rolling temperature is 826 ℃; air cooling to room temperature after rolling, and then carrying out no normalizing heat treatment.
The chemical compositions of the steel sheets in each of the examples and comparative examples are shown in Table 1.
The comprehensive mechanical properties of the steel plates of each example and comparative example are shown in Table 2.
Table 1 chemical compositions (weight%) of steel sheets in examples and comparative examples
Table 2 comprehensive mechanical properties of example and comparative example steel sheets
The steel plates in the embodiment 1, the embodiment 2 and the embodiment 3 of the invention have comprehensive mechanical properties meeting the requirements, particularly the elongation rate being more than 45 percent, and have higher anti-collision performance. The steel sheet of the example was subjected to metallographic structure observation, and the microstructure consisted of ferrite + a small amount of dispersed pearlite, and the grain size was 10 to 12 grades, as shown in fig. 1. While the comparative steel plates all had an elongation of <35%, the anti-collision performance was inferior to that of the examples. Comparative example 1 is a normal-fire marine steel, which has a composition design that differs greatly from the composition design of the present application, and has an elongation of only 34.6% although produced by the rolling and heat treatment process of the present application, and has a coarse grain size and a high pearlite content as compared with the example, as shown in fig. 2, from the viewpoint of metallographic structure; comparative example 2 was identical in composition and rolling process to example 2, but was not subjected to post-rolling water cooling and heat treatment, and the structure of comparative example 2 was not subjected to carbide redistribution and homogenization treatment after normalizing, and ductility did not meet the requirements, as compared with example 2; and the steel of the comparative example 3 is TMCP high-strength ship plate EH32, and is produced by adopting a conventional rolling control process, wherein the strength and the low-temperature toughness meet the requirements, but the elongation is only 28.4 percent, and the anti-collision performance is poor. Therefore, the conventional component design, rolling and normalizing processes are adopted, and the high anti-collision performance requirement with the elongation more than or equal to 35% is difficult to realize in industrial production, so that the ingenious, compatible and unique properties of the invention in component and process design are fully shown.
Claims (1)
1. A preparation method of hull steel with high collision resistance is characterized by comprising the following steps: the steel comprises the following chemical components, by weight, C=0.03-0.05%, si=0.25-0.35%, mn=1.30-1.40%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, nb=0.03-0.04%, ti=0.008-0.02%, al=0.015-0.05%, cr=0.20-0.30%, ni=0.30-0.40%, and the balance Fe and unavoidable impurity elements; the key preparation steps comprise: smelting the components by adopting a converter and casting the components into billets; heating the billet and performing two-stage rolling, wherein the heating temperature is controlled to be 1150-1200 ℃, the finishing temperature of rough rolling is more than or equal to 1000 ℃, the ratio of the thickness of the billet to the thickness of a final product when the rolling temperature is lower than Tnr ℃ during finish rolling is more than or equal to 4:1, and the finishing temperature of finish rolling is 10-30 ℃ above Ar 3; water cooling to below 200 ℃ after rolling; and then carrying out normalizing heat treatment, wherein the normalizing temperature is 880+/-10 ℃, the normalizing time is 2.0-2.5 min/mm multiplied by the thickness of the plate, the thickness of the hull steel with high collision resistance is 10-50 mm, the yield strength is more than or equal to 315Mpa, the tensile strength is 450-570Mpa, the impact energy at-40 ℃ is more than or equal to 200J, the elongation after the tensile fracture of the steel plate is more than or equal to 45%, the metallographic structure is ferrite plus a small amount of dispersed pearlite, and the grain size is 10-12 grade.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311405047.1A CN117431471A (en) | 2023-10-27 | 2023-10-27 | Preparation method of hull steel with high collision resistance |
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| CN202311405047.1A CN117431471A (en) | 2023-10-27 | 2023-10-27 | Preparation method of hull steel with high collision resistance |
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| CN117431471A true CN117431471A (en) | 2024-01-23 |
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