CN113817963A - 1000 MPa-level low-welding-crack-sensitivity steel plate and production method thereof - Google Patents

1000 MPa-level low-welding-crack-sensitivity steel plate and production method thereof Download PDF

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CN113817963A
CN113817963A CN202110990327.8A CN202110990327A CN113817963A CN 113817963 A CN113817963 A CN 113817963A CN 202110990327 A CN202110990327 A CN 202110990327A CN 113817963 A CN113817963 A CN 113817963A
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白海瑞
杨雄
刘智光
魏慧慧
杨源远
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Abstract

The invention discloses a 1000 MPa-grade low-welding crack sensitivity steel plate which comprises the following chemical components in percentage by mass: less than or equal to 0.15 percent, Si: less than or equal to 0.40 percent, Mn: less than or equal to 1.60 percent, P: less than or equal to 0.017 percent, less than or equal to 0.005 percent of S, Alt: 0.020-0.050%, Nb is less than or equal to 0.050%, Ti is less than or equal to 0.030%, V: less than or equal to 0.080 percent, Cr is less than or equal to 0.60 percent, Mo: less than or equal to 0.60 percent, Ni: less than or equal to 1.5 percent, less than or equal to 0.5 percent of Cu, less than or equal to 0.0030 percent of B, and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The steel plate has high steel cleanliness, fine and uniform structure, high strength, excellent low-temperature impact toughness, cold bending property and welding property, and mechanical property and process property meeting the technical requirements of users.

Description

1000 MPa-level low-welding-crack-sensitivity steel plate and production method thereof
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to a 1000 MPa-level low-welding crack sensitivity steel plate and a production method thereof.
Background
Hydroelectric power generation is used as clean energy, has the characteristics of reproducibility, no pollution, low operating cost, convenience in carrying out electric power peak regulation and the like, and is favorable for improving the resource utilization rate. Under the condition that the traditional energy is increasingly tense, all countries in the world have high priority to develop water and electricity and utilize water resources. About 77 hydropower project projects which are planned and constructed are mainly distributed in the watersheds of Yalu Tibetan Bujiang, anger river, Jinshajiang, lanuguan, yellow river upstream, Heilongjiang, Yigong Tibetan Bujiang, Parlong Tibetan Bujiang, Minjiang and the like. The steel material special for hydropower is mainly a medium plate product, the steel for domestic hydropower station pressure steel pipes mainly adopts 3 strength grades of steel, namely 500MPa grade, 600MPa grade and 800MPa grade, the 600MPa grade and 800MPa grade are main streams of the steel for hydropower stations, and the steel is mainly used for manufacturing pressure pipelines, ribbed plates, branch pipes, volutes and the like of large hydropower stations, and has high requirements on low-temperature toughness and welding performance of steel plates due to poor service environment. In recent years, with increasing numbers of installed capacity, water head, and the like of hydropower stations, higher demands have been made on steel plates, and steel plates having higher strength, good low-temperature toughness, and good weldability have been used. The development of the 1000 MPa-grade low-welding crack sensitivity steel plate is imminent, and the method has good market prospect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 1000 MPa-level low-welding crack sensitivity steel plate with the thickness of 10.0-80.0 mm and a production method thereof, wherein the steel plate has the advantages of high steel cleanliness, fine and uniform structure, high strength, excellent low-temperature impact toughness (transverse impact energy at minus 40 ℃ of 181-239J), cold bending property and welding property (carbon equivalent Ceq is 0.53-0.58%, and welding crack sensitivity coefficient Pcm is 0.24-0.27%), and mechanical property and technological property meet the technical requirements of users.
In order to solve the technical problems, the invention adopts the following technical scheme:
a1000 MPa-grade low-welding crack sensitivity steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.15 percent, Si: less than or equal to 0.40 percent, Mn: less than or equal to 1.60 percent, P: less than or equal to 0.017 percent, less than or equal to 0.005 percent of S, Alt: 0.020-0.050%, Nb is less than or equal to 0.050%, Ti is less than or equal to 0.030%, V: less than or equal to 0.080 percent, Cr is less than or equal to 0.60 percent, Mo: less than or equal to 0.60 percent, Ni: less than or equal to 1.5 percent, less than or equal to 0.5 percent of Cu, less than or equal to 0.0030 percent of B, and the balance of Fe and inevitable impurities.
A production method of a 1000 MPa-grade low-welding crack sensitivity steel plate comprises the following steps:
the smelting-continuous casting production process flow comprises the following steps: KR desulfurization, converter, LF refining, RH vacuum treatment, slab continuous casting and slow cooling;
in the heating process, the plate blank enters a furnace; strictly controlling the on-furnace time and the off-furnace temperature of the plate blank, wherein the on-furnace time is 250-320 min, the soaking time is 30-60 min, and the off-furnace temperature is 1220 +/-20 ℃;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling completes broadening in as few passes as possible, the relative reduction rate of at least 2 passes of a single pass is controlled to be more than 14 percent according to different product thicknesses, and the final rolling temperature of the rough rolling is more than or equal to 1050 ℃; the initial rolling temperature of finish rolling is less than or equal to 950 ℃, the relative reduction rate of at least 2 passes is more than 14 percent, and the final rolling temperature of finish rolling is 820 +/-15 ℃;
laminar flow cooling equipment is adopted for cooling, a secondary system self-learning calculation result is adopted in a cooling mode, and the coiling temperature is 550 +/-20 ℃;
the heat treatment process adopts a quenching and tempering process: quenching temperature is 900-920 ℃, and heat preservation time is 10-20 min; the tempering temperature is 600-650 ℃, and the heat preservation time is 20-40 min.
Further, carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole smelting process of the converter, adding scrap steel into the converter, wherein the tapping temperature of the converter is 1643 ℃, then carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out RH vacuum treatment on the molten steel refined by the LF external refining, keeping the vacuum time for more than or equal to 10min, carrying out slab continuous casting, and carrying out slab cleaning, slow cooling and continuous casting slab quality inspection after the superheat degree is 25 ℃; the heating temperature of the plate blank is 1220 ℃, the heating time is 251min, and the heated plate blank is subjected to high-pressure water dephosphorization; the rough rolling finishing temperature is 1061 ℃, and then the temperature is kept until the thickness of the product is 3 times of the thickness of the finished product; the initial rolling temperature of finish rolling is 940 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 819 ℃, and the thickness of a finished product is 12.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 570 ℃; the hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 640 ℃, and the heat preservation time is 20 min.
Further, carrying out desulfurization pretreatment on the molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the converter temperature of 1640 ℃; then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1562 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min; carrying out slab continuous casting with the superheat degree of 23 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; heating the plate blank at 1225 ℃ for 265min, and removing phosphorus from the heated plate blank by using high-pressure water; the rough rolling finishing temperature is 1068 ℃, and then the temperature is kept until the thickness of the temperature is 2.8 times of the thickness of a finished product; the initial rolling temperature of finish rolling is 925 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 825 ℃, and the thickness of a finished product is 25.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 550 ℃; the hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 620 ℃, and the heat preservation time is 20 min.
Further, carrying out desulfurization pretreatment on the molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the temperature of 1645 ℃ by using the converter; then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1566 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min; (ii) a Carrying out slab continuous casting with the superheat degree of 28 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; heating the plate blank at 1235 ℃ for 276min, and removing phosphorus from the heated plate blank by using high-pressure water; the rough rolling finishing temperature is 1077 ℃, and then the temperature is kept until the thickness of the temperature is 1.8 times of the thickness of the finished product; the initial rolling temperature of finish rolling is 910 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 840 ℃, and the thickness of a finished product is 65.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 530 ℃; and (3) carrying out quenching and tempering heat treatment on the steel plate after hot rolling, wherein the quenching temperature is 910 ℃, the heat preservation time is 20min, the tempering temperature is 600 ℃, and the heat preservation time is 40 min.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention provides a 1000 MPa-grade low-welding crack sensitivity steel plate with the thickness of 10.0-80.0 mm and a production method thereof, the microstructure of the steel is tempered sorbite, the grain size is about 12.5 grade, the steel has excellent cold bending property, low-temperature impact toughness (the transverse impact energy at minus 40 ℃ is more than or equal to 47J) and welding property (the carbon equivalent Ceq is less than or equal to 0.60 percent, and the welding crack sensitivity coefficient Pcm is less than or equal to 0.28 percent), and the mechanical property and the technological property meet the technical requirements of users. Meanwhile, the preparation method is simple and suitable for industrial production. The steel plate prepared by the method can meet the requirement of higher-strength hydroelectric steel and has wide market prospect.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a microstructure diagram of a steel sheet according to example 1 of the present invention.
Detailed Description
The present invention is described in more detail below by way of specific examples. The examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the temperature of 1643 ℃ in the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min. Slab continuous casting was carried out according to the metallurgical chemical composition shown in table 1 with a superheat degree of 25 ℃, followed by slab cleaning, slow cooling, and quality inspection of the continuous cast slab. The heating temperature of the plate blank is 1220 ℃, the heating time is 251min, and the heated plate blank is subjected to high-pressure water dephosphorization. The rough rolling finishing temperature is 1061 ℃, and then the temperature is kept until the thickness is 3 times of the thickness of the finished product. The initial rolling temperature of the finish rolling is 940 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of the finish rolling is 819 ℃, and the thickness of the finished product is 12.0 mm. Subsequently, the average temperature of the steel plate was reduced to 570 ℃ by laminar cooling. The hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 640 ℃, and the heat preservation time is 20 min. And finally, detecting the surface quality and the mechanical property of the product.
Example 2
Carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and tapping the steel at the converter at the temperature of 1640 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1562 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min. Slab continuous casting was carried out according to the metallurgical chemical composition shown in table 1 with a superheat degree of 23 ℃, followed by slab cleaning, slow cooling, and quality inspection of the continuous cast slab. The heating temperature of the plate blank is 1225 ℃, the heating time is 265min, and the heated plate blank is subjected to high-pressure water dephosphorization. The rough rolling finishing temperature is 1068 ℃, and then the temperature is kept until the thickness is 2.8 times of the thickness of the finished product. The initial rolling temperature of finish rolling is 925 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 825 ℃, and the thickness of a finished product is 25.0 mm. Subsequently, the average temperature of the steel plate was reduced to 550 ℃ by laminar cooling. The hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 620 ℃, and the heat preservation time is 20 min. And finally, detecting the surface quality and the mechanical property of the product.
Example 3
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out steel tapping at the temperature of 1645 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1566 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min. Slab continuous casting was carried out according to the metallurgical chemical composition shown in table 1 with a superheat degree of 28 ℃, followed by slab cleaning, slow cooling, and quality inspection of the continuous cast slab. The heating temperature of the plate blank is 1235 ℃, the heating time is 276min, and the heated plate blank is subjected to high-pressure water dephosphorization. The rough rolling finishing temperature is 1077 ℃, and then the temperature is kept until the thickness is 1.8 times of the thickness of the finished product. The initial rolling temperature of finish rolling is 910 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 840 ℃, and the thickness of a finished product is 65.0 mm. Then, the average temperature of the steel plate is reduced to 530 ℃ by laminar cooling. And (3) carrying out quenching and tempering heat treatment on the steel plate after hot rolling, wherein the quenching temperature is 910 ℃, the heat preservation time is 20min, the tempering temperature is 600 ℃, and the heat preservation time is 40 min. And finally, detecting the surface quality and the mechanical property of the product (sampling at the plate thickness of 1/4).
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
Figure BDA0003232229010000061
The mechanical properties of the steel sheets of examples 1 to 3 of the present invention were examined, and the results are shown in Table 2.
TABLE 2 mechanical Properties of examples 1 to 3 of the present invention
Figure BDA0003232229010000062
As can be seen from the data in Table 2, the mechanical properties of the steel plate meet the technical requirements of users.
It is noted that all similar variations, which would be directly derived or suggested by those skilled in the art from the present disclosure, are intended to be within the scope of the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (5)

1. A1000 MPa-grade low-welding crack sensitivity steel plate is characterized by comprising the following chemical components in percentage by mass: less than or equal to 0.15 percent, Si: less than or equal to 0.40 percent, Mn: less than or equal to 1.60 percent, P: less than or equal to 0.017 percent, less than or equal to 0.005 percent of S, Alt: 0.020-0.050%, Nb is less than or equal to 0.050%, Ti is less than or equal to 0.030%, V: less than or equal to 0.080 percent, Cr is less than or equal to 0.60 percent, Mo: less than or equal to 0.60 percent, Ni: less than or equal to 1.5 percent, less than or equal to 0.5 percent of Cu, less than or equal to 0.0030 percent of B, and the balance of Fe and inevitable impurities.
2. The method for producing a 1000MPa grade steel plate with low weld crack sensitivity as claimed in claim 1, comprising:
the smelting-continuous casting production process flow comprises the following steps: KR desulfurization, converter, LF refining, RH vacuum treatment, slab continuous casting and slow cooling;
in the heating process, the plate blank enters a furnace; strictly controlling the on-furnace time and the off-furnace temperature of the plate blank, wherein the on-furnace time is 250-320 min, the soaking time is 30-60 min, and the off-furnace temperature is 1220 +/-20 ℃;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling completes broadening in as few passes as possible, the relative reduction rate of at least 2 passes of a single pass is controlled to be more than 14 percent according to different product thicknesses, and the final rolling temperature of the rough rolling is more than or equal to 1050 ℃; the initial rolling temperature of finish rolling is less than or equal to 950 ℃, the relative reduction rate of at least 2 passes is more than 14 percent, and the final rolling temperature of finish rolling is 820 +/-15 ℃;
laminar flow cooling equipment is adopted for cooling, a secondary system self-learning calculation result is adopted in a cooling mode, and the coiling temperature is 550 +/-20 ℃;
the heat treatment process adopts a quenching and tempering process: quenching temperature is 900-920 ℃, and heat preservation time is 10-20 min; the tempering temperature is 600-650 ℃, and the heat preservation time is 20-40 min.
3. The production method of claim 2, wherein molten iron is subjected to desulfurization pretreatment, molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten steel, argon is blown in the whole smelting process of the converter, scrap steel is added into the converter, the tapping temperature of the converter is 1643 ℃, then the molten steel after smelting in the converter is subjected to LF external refining, the refining in-place temperature is more than or equal to 1560 ℃, the molten steel after LF external refining is subjected to RH vacuum treatment, the vacuum time is kept for more than or equal to 10min, slab continuous casting is carried out, the superheat degree is 25 ℃, and then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out; the heating temperature of the plate blank is 1220 ℃, the heating time is 251min, and the heated plate blank is subjected to high-pressure water dephosphorization; the rough rolling finishing temperature is 1061 ℃, and then the temperature is kept until the thickness of the product is 3 times of the thickness of the finished product; the initial rolling temperature of finish rolling is 940 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 819 ℃, and the thickness of a finished product is 12.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 570 ℃; the hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 640 ℃, and the heat preservation time is 20 min.
4. The production method according to claim 2, characterized in that molten iron is subjected to desulfurization pretreatment, molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten iron, argon is blown during the whole smelting process in the converter, scrap steel is added into the converter, and the tapping temperature of the converter is 1640 ℃; then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1562 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min; carrying out slab continuous casting with the superheat degree of 23 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; heating the plate blank at 1225 ℃ for 265min, and removing phosphorus from the heated plate blank by using high-pressure water; the rough rolling finishing temperature is 1068 ℃, and then the temperature is kept until the thickness of the temperature is 2.8 times of the thickness of a finished product; the initial rolling temperature of finish rolling is 925 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 825 ℃, and the thickness of a finished product is 25.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 550 ℃; the hot rolled steel plate needs to be subjected to quenching and tempering heat treatment, wherein the quenching temperature is 900 ℃, the heat preservation time is 10min, the tempering temperature is 620 ℃, and the heat preservation time is 20 min.
5. The production method of claim 2, wherein the molten iron is subjected to desulfurization pretreatment, the molten iron is decarburized and dephosphorized by smelting in a top-bottom combined blown converter to obtain molten iron, argon is blown during the whole smelting process in the converter, scrap steel is added into the converter, and the tapping temperature of the converter is 1645 ℃; then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1566 ℃, and carrying out RH vacuum treatment on the molten steel refined outside the LF furnace for more than or equal to 10 min; (ii) a Carrying out slab continuous casting with the superheat degree of 28 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; heating the plate blank at 1235 ℃ for 276min, and removing phosphorus from the heated plate blank by using high-pressure water; the rough rolling finishing temperature is 1077 ℃, and then the temperature is kept until the thickness of the temperature is 1.8 times of the thickness of the finished product; the initial rolling temperature of finish rolling is 910 ℃, the relative reduction rate of at least 2 passes is more than 14%, the final rolling temperature of finish rolling is 840 ℃, and the thickness of a finished product is 65.0 mm; then, carrying out laminar cooling, and reducing the average temperature of the steel plate to 530 ℃; and (3) carrying out quenching and tempering heat treatment on the steel plate after hot rolling, wherein the quenching temperature is 910 ℃, the heat preservation time is 20min, the tempering temperature is 600 ℃, and the heat preservation time is 40 min.
CN202110990327.8A 2021-08-26 2021-08-26 1000 MPa-level low-welding-crack-sensitivity steel plate and production method thereof Pending CN113817963A (en)

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Application publication date: 20211221