CN110592469A - 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering and preparation method thereof - Google Patents
550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering and preparation method thereof Download PDFInfo
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- 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
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
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Abstract
The invention provides a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering and a manufacturing method thereof, belonging to the technical field of ocean engineering steel, wherein the steel plate comprises the following chemical components: 0.03-0.10% of C, 0.10-0.30% of Si, 1.0-1.70% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb0.02, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo0.4-1.0% of Ni, 0.1-0.4% of Cu, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb, V and Ti, and the balance of Fe and inevitable impurities. Strictly controlling the technological parameters of rolling and cooling control, wherein the thickness specification of the produced steel plate is 40-80mm, and the microstructure of the steel plate is lath bainite and granular bainite. The method has the advantages that the method can realize the welding without preheating on the premise of ensuring high strength and high toughness due to the low crack sensitivity coefficient Pcm of the steel plate.
Description
Technical Field
The invention belongs to the technical field of steel for ocean engineering, and particularly relates to a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering and a preparation method thereof.
Background
At present, the ultra-high strength marine steel mostly needs preheating before welding by 100-150 ℃, and the high preheating temperature not only wastes energy, but also reduces welding efficiency and improves construction cost. The development of the low-crack-sensitivity marine steel which can meet the requirements of non-preheating or low-preheating welding is imperative, and therefore, the requirement of a steel plate with the thickness of more than 40mm and the specification of no preheating of 550MPa is provided for marine engineering steel users.
The invention patent with publication number CN100400213C proposes a welding process method of low temperature resistant steel plates, which selects flux welding respectivelyWelding material for strip arc welding and flux-cored wire CO2The welding material is gas shielded, the welding line energy is not more than 2.5KJ/mm, the minimum preheating temperature before welding is 50 ℃, and the low-temperature impact at minus 40 ℃ is ensured.
The patent with the publication number of CN102794583B discloses a preheating-free welding rod and a preparation method and application thereof, wherein a welding material matched with low-alloy high-strength steel welding does not need to be preheated in the using process, the content of diffusible hydrogen and the hardenability of the welding material can be obviously reduced, the cold cracks of welding are reduced, and the steel plate is not developed in the patent.
The invention patent with publication number CN103447672B provides a submerged arc welding process of a large-thickness low-temperature steel plate with yield strength of 690MPa, the high strength and low-temperature impact toughness of weld metal are well matched, the tensile strength of the weld is more than 830MPa, the impact energy of the weld is more than 100J at-60 ℃, and the preheating temperature is more than 200 ℃.
The Q690CF hot-rolled steel plate disclosed in the patent of the invention with the publication number of CN105420632B and the preparation method thereof have the advantages of high strength, good low-temperature toughness and welding performance, capability of realizing preheating-free welding, low preparation cost and simple process. But the thickness specification of the patent is only 12-25mm, and the thickness is thinner; the Mn content is high, and the Ni content and the V content are low.
The invention patents with the publication numbers of CN101476080A, CN101812634A, CN104195429A and CN100516270C propose that the low-crack-sensitivity steel plates are all produced by adopting a quenching and tempering process, and have the advantages of multiple links, high cost and low production efficiency.
The invention discloses a low welding crack sensitivity steel plate and a production method thereof in patent publication No. CN101096738A, wherein the production process of TMCP + tempering is mainly adopted, and in addition, the Mn element is added in a lower amount and B element is added.
The invention discloses a 690 MPa-grade low-welding crack sensitivity steel and a manufacturing method thereof, and mainly adopts a TMCP + tempering process, wherein Ti and Cu are not added in alloy design.
The invention patent with the publication number of CN101481774A proposes a low crack sensitivity steel plate with the yield strength of 500MPa and a manufacturing method thereof, wherein the yield strength is only 500MPa, and Ni, Cu, Cr and Mo elements are not added, but B elements are added.
The invention patent with publication number CN101353759A proposes a low crack sensitivity steel plate with 550MPa grade yield strength and a manufacturing method thereof, the carbon content is lower, and V element is not added, but B element is added.
The invention patent with publication number CN101418418A proposes a low crack sensitivity steel plate with 690MPa grade yield strength and a manufacturing method thereof, wherein Cu and Ni elements are not added in the steel, and B elements are added in the steel.
In conclusion, the current technology is difficult to meet the requirement of the steel plate with the thickness of more than 40mm and the specification without preheating and the pressure of 550 MPa.
Disclosure of Invention
In view of the above, the invention provides a 550 MPa-grade preheating-free welded thick-specification steel plate for ocean engineering and a preparation method thereof, aiming at the requirement of the current domestic market for preheating-free welded steel for ocean engineering, the rolling-controlled cooling-controlled process is adopted to produce the high-strength, high-toughness, preheating-free welded steel for ocean engineering with good lamellar tearing resistance, the yield strength is 550MPa, and the thickness range of the steel plate is 40-80 mm.
The invention provides a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering, which comprises the following chemical components in percentage by mass: 0.03-0.10% of C, 0.10-0.30% of Si, 1.0-1.70% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb0.02, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo0.4-1.0% of Ni, 0.1-0.4% of Cu, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb, V and Ti, and the balance of Fe and inevitable impurity elements.
The chemical composition and the content proportion of the 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering directly influence the product performance, and the carbon content of the steel plate is strictly controlled to be 0.03-0.1%; meanwhile, in order to ensure that the low-temperature toughness Ni content of the steel plate and the welding joint is preferably more than 0.5 percent, the upper limit of the cost is considered to be 1.0 percent; in order to ensure the strength of the TMCP steel plate, microalloying treatment of Nb, V and Ti is adopted; meanwhile, a certain content of Cu and Mo elements are added, so that the strength of the steel plate can be ensured, and the seawater corrosion resistance of the steel for ocean engineering can be improved; the purity of the molten steel is strictly controlled, and P is ensured to be lower than 0.01 percent and S is ensured to be lower than 0.005 percent. Based on the above component design, the balance of steel plate strength, low temperature toughness, corrosion resistance and low crack sensitivity is realized.
Preferably, the microstructure of the steel plate is lath bainite and granular bainite, and the microstructure of the steel plate is uniformly distributed in the thickness direction.
More preferably, the microstructure of the steel sheet is: 70-90% of lath bainite and 10-30% of granular bainite in percentage by volume.
Preferably, the thickness of the steel plate is 40-80 mm.
Preferably, the yield strength of the 550 MPa-grade non-preheating welding thick-specification steel plate for ocean engineering is more than or equal to 550MPa, the tensile strength is 670-830MPa, the elongation is more than or equal to 14 percent, the average value of the conventional impact energy at the position 1/4 at minus 40 ℃ and the center part is more than or equal to 90J, and the reduction of area in the Z direction is more than 35 percent.
The invention provides a preparation method of the 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering, which comprises the following process flows of: smelting high-cleanness steel, desulfurizing molten iron, blowing at the top and the bottom of a converter, vacuum processing, casting blank, heating plate blank, rolling and cooling by water. In the process flow, in order to obtain the steel plate for the 550 MPa-level non-preheating welding thick ocean engineering, the process operation and the process parameters of the heating, rolling and water cooling steps of the plate blank are optimally designed, and the specific steps comprise:
s1, obtaining a casting blank meeting the chemical component requirement;
s2, heating of the plate blank: in order to fully dissolve microalloy elements and ensure a certain austenite grain size, a casting blank is heated to 1150-1230 ℃, and heat preservation is carried out for 2-4 hours, so that not only is the billet fully heated, but also the austenite grain is inhibited from excessively growing, and the average grain size of the prior austenite is controlled within 125um after heating;
s3, rolling: the rolling is divided into two stages of recrystallization zone rolling and non-recrystallization zone rolling; the rolling temperature of the recrystallization zone at the rolling stage is 950 ℃ plus 1150 ℃, the rolling temperature of the non-recrystallization zone is 860 ℃ plus 900 ℃, and the final rolling temperature is 820 ℃ plus 870 ℃;
s4, water cooling: and (3) carrying out water cooling on the rolled steel plate, strictly controlling the final cooling temperature and the cooling speed of laminar cooling, and controlling the final cooling temperature to be 400-500 ℃ and the cooling speed to be 3-9 ℃/s according to different thickness specifications.
Preferably, in step S3, the recrystallization zone rolling includes at least two passes with a reduction of more than 15%. The rolling reduction rate of the recrystallization zone in the rolling stage is improved, and the uniformity of the thick steel plate in the thickness direction is ensured.
Preferably, in step S3, the intermediate temperature-waiting thickness is controlled to be 1.1-2.0 times of the thickness of the finished product.
More preferably, in step S3, the thickness of the finished product is 40-80 mm.
Compared with the prior art, the invention has the following advantages:
the process strictly controls the content of alloy elements, reduces Pcm, ensures that micro alloy elements are fully dissolved and inhibits overlarge austenite grains in the slab heating stage, improves the reduction rate in the recrystallization zone rolling stage to ensure the thickness direction uniformity of the thick steel plate by matching with the two-stage rolling process of recrystallization zone rolling and non-recrystallization zone rolling, and combines the water cooling process to obtain the steel plate with the specific microstructure. Compared with the same-grade steel plate, the steel plate produced by the invention has the characteristics of large thickness, high strength, uniform mechanical property and no preheating welding: the yield strength is more than or equal to 550MPa, the tensile strength is 670-.
Drawings
FIG. 1 is a 1/4 site microscopic structure view of a cross section of a 60mm thick steel plate provided in example 1 of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The method for preparing the 550MPa grade preheating-free welding thick gauge steel plate for ocean engineering provided by the invention is described in detail by combining three specific embodiments.
Example 1
The embodiment provides a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering, which comprises the following chemical components in percentage by mass: 0.088% of C, 0.24% of Si, 1.56% of Mn, 0.034% of Alt, 0.059% of Nb, 0.043% of V, 0.017% of Ti, 0.26% of Mo, 0.45% of Ni, 0.17% of Cu, 0.008% of P, 0.003% of S, the balance of Fe and inevitable impurity elements, and the thickness of the steel plate is 60 mm.
The preparation process of the 550 MPa-level preheating-free welded thick-specification steel plate for ocean engineering comprises the steps of high-cleanness steel smelting, molten iron desulphurization, converter top and bottom combined blowing, vacuum treatment, casting blank, plate blank heating, rolling and water cooling. Specifically, the process comprises the following steps:
(1) smelting high-cleanness steel, desulfurizing molten iron, blowing the converter top and bottom in a combined manner, carrying out vacuum treatment, and carrying out casting blank according to a conventional process to obtain a casting blank meeting the requirements of chemical components;
(2) in the slab heating stage, in order to fully dissolve the microalloy elements and ensure a certain austenite grain size, the steel slab is heated to 1200 ℃, and the heat preservation time is 3 hours, so that the steel slab is fully heated and the excessive growth of the austenite grains is inhibited;
(3) rolling is divided into two stages, namely rolling in a recrystallization zone and rolling in a non-recrystallization zone; the initial rolling temperature of the rolling stage in the recrystallization zone is 1150 ℃, the rolling reduction rate of the recrystallization zone in two passes is 16%, the intermediate temperature-waiting thickness is controlled to be 1.5 times of the thickness of a finished product, the initial rolling temperature of the non-recrystallization zone is controlled to be 870 ℃, and the final rolling temperature is controlled to be 850 ℃;
(4) a water cooling process: strictly controlling the final cooling temperature and the cooling speed of laminar cooling; aiming at the thickness specification of 60mm, the final cooling temperature is controlled to be 460 ℃, and the cooling speed is controlled to be 6 ℃/s.
The microstructure of the steel plate obtained in this example is shown in fig. 1, and it can be seen from fig. 1 that the microstructure of the steel plate is mainly lath bainite and granular bainite, and the microstructure is not greatly different in the thickness direction.
Further, the mechanical properties of the steel sheet obtained in this example were tested, and the test results are shown in table 1.
TABLE 1 example 1 tensile and conventional impact Properties of steel sheet
| Specification/mm | Yield strength/MPa | Tensile strength/MPa | Elongation after break/% | Z direction/%) | -40 ℃ impact work/J |
| 60 | 559 | 682 | 19.5 | 56 52 48 52 | 90236232 186 |
Example 2
The embodiment provides a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering, which comprises the following chemical components in percentage by mass: 0.044% of C, 0.24% of Si, 1.52% of Mn, 0.039% of Alt, 0.048% of Nb, 0.052% of V, 0.015% of Ti, 0.33% of Mo, 0.21% of Cu, 0.58% of Ni, 0.01% of P, 0.0029% of S, the balance of Fe and inevitable impurity elements, and the thickness of the steel plate is 60 mm.
The preparation process of the 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering is consistent with that of the steel plate in the example 1, the mechanical properties of the steel plate obtained in the example are tested, and the test results are shown in the table 2.
Table 2 example 2 tensile and conventional mechanical properties of steel sheet
| Specification/mm | Yield strength/MPa | Tensile strength/MPa | Elongation after break/% | Z direction/%) | -40 ℃ impact work/J |
| 60 | 589 | 714 | 19 | 54 51 58 54 | 212 237 127 192 |
Further, the steel plate is used for non-preheating welding, the technological parameters of the non-preheating welding are shown in table 3, the mechanical property test result after welding is shown in table 4, and the steel plate does not crack after being used for the non-preheating welding under different technological conditions.
TABLE 3 welding Process parameters without preheating
TABLE 4 post-weld mechanical Properties
Example 3
The embodiment provides a 550 MPa-grade preheating-free welding thick-specification steel plate for ocean engineering, which comprises the following chemical components in percentage by mass: 0.03% of C, 0.12% of Si, 1.37% of Mn, 0.031% of Alt, 0.028% of Nb, 0.035% of V, 0.011% of Ti, 0.42% of Mo, 0.60% of Ni, 0.32% of Cu, 0.007% of P, 0.003% of S, the balance of Fe and inevitable impurity elements, and the thickness of the steel plate is 60 mm.
The preparation process of the 550 MPa-level preheating-free welded thick-specification steel plate for ocean engineering comprises the steps of high-cleanness steel smelting, molten iron desulphurization, converter top and bottom combined blowing, vacuum treatment, casting blank, plate blank heating, rolling and water cooling. Specifically, the process comprises the following steps:
(1) smelting high-cleanness steel, desulfurizing molten iron, blowing the converter top and bottom in a combined manner, carrying out vacuum treatment, and carrying out casting blank according to a conventional process to obtain a casting blank meeting the requirements of chemical components;
(2) in the slab heating stage, in order to fully dissolve the microalloy elements and ensure a certain austenite grain size, the steel slab is heated to 1180 ℃ and the heat preservation time is 3 hours, so that the steel slab is fully heated and the excessive growth of the austenite grains is inhibited;
(3) rolling is divided into two stages, namely rolling in a recrystallization zone and rolling in a non-recrystallization zone; the initial rolling temperature of the recrystallization zone in the rolling stage is 1050 ℃, the reduction rate of the recrystallization zone in two rolling passes is 15%, the intermediate temperature-waiting thickness is controlled to be 1.1 times of the thickness of a finished product, the initial rolling temperature of the non-recrystallization zone is controlled to be 880 ℃, and the final rolling temperature is 830 ℃;
(4) a water cooling process: strictly controlling the final cooling temperature and the cooling speed of laminar cooling; aiming at the thickness specification of 60mm, the final cooling temperature is controlled to be 420 ℃, and the cooling speed is controlled to be 8 ℃/s.
The microstructure of the steel plate obtained in the embodiment is mainly lath bainite and granular bainite, and the mechanical property is basically consistent with that of the steel plate obtained in the embodiment 1.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a thick specification steel sheet for ocean engineering of 550MPa level non-preheating welding which characterized in that: the chemical components comprise the following components in percentage by mass: 0.03-0.10% of C, 0.10-0.30% of Si, 1.0-1.70% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb0.02, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo0.4-1.0% of Ni, 0.1-0.4% of Cu, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb, V and Ti, and the balance of Fe and inevitable impurity elements.
2. The steel plate for 550MPa grade non-preheating welding thick specification ocean engineering according to claim 1, which is characterized in that: the microstructure of the steel plate is lath bainite and granular bainite, and the microstructure of the steel plate is uniformly distributed in the thickness direction.
3. The steel plate for 550MPa grade non-preheating welding thick specification ocean engineering according to claim 2, characterized in that: the microstructure of the steel plate is as follows: 70-90% of lath bainite and 10-30% of granular bainite in percentage by volume.
4. The steel plate for 550MPa grade non-preheating welding thick specification ocean engineering according to claim 1, which is characterized in that: the thickness of the steel plate is 40-80 mm.
5. The steel plate for 550MPa grade non-preheating welding thick specification ocean engineering according to claim 1, which is characterized in that: the yield strength of the 550 MPa-level non-preheating welding thick-specification steel plate for ocean engineering is more than or equal to 550MPa, the tensile strength is 670-830MPa, the elongation is more than or equal to 14 percent, the average value of conventional impact energy at 1/4 at the temperature of minus 40 ℃ and the center is more than or equal to 90J, and the Z-direction section shrinkage rate is more than 35 percent.
6. The method for preparing the 550MPa grade preheating-free welding thick gauge steel plate for ocean engineering as recited in claim 1, the steps include:
s1, obtaining a casting blank meeting the chemical component requirement;
s2, heating of the plate blank: heating the casting blank to 1150-1230 ℃, and preserving heat for 2-4 h;
s3, rolling: the rolling is divided into two stages of recrystallization zone rolling and non-recrystallization zone rolling; the rolling temperature of the recrystallization zone at the rolling stage is 950 ℃ plus 1150 ℃, the rolling temperature of the non-recrystallization zone is 860 ℃ plus 900 ℃, and the final rolling temperature is 820 ℃ plus 870 ℃;
s4, water cooling: and (3) carrying out water cooling on the rolled steel plate, and controlling the final cooling temperature to be 400-500 ℃ and the cooling speed to be 3-9 ℃/s.
7. The method for preparing the steel plate for the 550 MPa-grade non-preheating welding thick-specification ocean engineering as claimed in claim 5, wherein the method comprises the following steps: in step S3, the recrystallization-zone rolling includes at least two passes of rolling with a reduction of over 15%.
8. The method for preparing the steel plate for the 550 MPa-grade non-preheating welding thick-specification ocean engineering as claimed in claim 5, wherein the method comprises the following steps: in step S3, the thickness of the intermediate temperature waiting is controlled to be 1.1-2.0 times of the thickness of the finished product.
9. The method for preparing the 550MPa grade preheating-free welding thick specification steel plate for ocean engineering as claimed in claim 8, is characterized in that: in step S3, the thickness of the finished product is 40-80 mm.
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| CN117165857A (en) * | 2023-09-23 | 2023-12-05 | 湖南华菱湘潭钢铁有限公司 | Large-thickness ultrahigh-toughness steel plate for ocean engineering and production method thereof |
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| JP2000199036A (en) * | 1999-01-07 | 2000-07-18 | Nippon Steel Corp | Superhigh strength linepipe excellent in low temperature toughness and its production |
| JP2001200334A (en) * | 2000-01-17 | 2001-07-24 | Nkk Corp | 60 kilo class high tensile strength steel excellent in weldability and toughness |
| CN102400063A (en) * | 2010-09-15 | 2012-04-04 | 鞍钢股份有限公司 | Ultra-high strength hull and offshore platform steel with yield strength of 550 Mpa and production method thereof |
| CN102337460A (en) * | 2011-11-14 | 2012-02-01 | 首钢总公司 | Ultrahigh-strength structural steel board for ocean engineering and production method thereof |
| CN102534383A (en) * | 2012-03-01 | 2012-07-04 | 首钢总公司 | High-tenacity steel plate for ocean engineering and manufacturing method thereof |
| CN104404384A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | 550 MPa-grade low-compression-ratio high-toughness steel plate for ocean engineering platform and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117165857A (en) * | 2023-09-23 | 2023-12-05 | 湖南华菱湘潭钢铁有限公司 | Large-thickness ultrahigh-toughness steel plate for ocean engineering and production method thereof |
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