CN110791713A - Super-thick steel plate with low compression ratio of 690MPa and manufacturing method thereof - Google Patents
Super-thick steel plate with low compression ratio of 690MPa and manufacturing method thereof Download PDFInfo
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- 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 discloses a super-thick steel plate with a low compression ratio of 690MPa and a manufacturing method thereof, relating to the technical field of steel smelting, wherein the super-thick steel plate comprises the following chemical components in percentage by mass: c: 0.06% -0.10%, Si: 0.20-0.50%, Mn: 1.45-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.20% -1.80%, Cu: 0.10% -0.40%, Mo: 0.10% -0.50%, Nb: 0.010% -0.050%, V: 0.001-0.040%, Ti: 0.001-0.020%, Al: 0.015 to 0.040 percent, and the balance of Fe and inevitable impurities. The prepared super-thick super-high strength steel plate has excellent low-temperature toughness and good matching strength and toughness, and is 120-160 mm thick and 690MPa grade.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a 690 MPa-grade super-thick steel plate with a low compression ratio and a manufacturing method thereof.
Background
The 690 MPa-grade super-thick super-high-strength steel plate is a basic steel material for equipment such as marine equipment, engineering machinery, boiler containers and the like. The steel-iron material for ocean engineering is a basic material guarantee for expanding ocean space, developing ocean resources, improving ocean competitiveness and maintaining ocean rights and interests. With the gradual trend of ocean economy to deep sea in China, the steel for ocean engineering is developed towards the direction of extra thickness, ultrahigh strength and excellent low-temperature toughness, and higher requirements are put forward on the aspects of mechanical properties, particularly toughness matching and the like of the steel plate for extra thick ocean engineering.
The requirement of the compression ratio is more than or equal to 3:1, and the rolling blank is required to be thicker and thicker along with the continuous increase of the thickness of the steel plate. In the rolling production process of the super-thick steel plate, the deformation is uneven, and the rolling force is difficult to effectively permeate into the steel plate, so that the internal structure of the steel plate is relatively thick, and the improvement of low-temperature toughness is not facilitated. The thickness effect gradually appears as the thickness of the steel sheet increases, the hardenability inside the steel sheet becomes worse and worse as the thickness increases, and the low-temperature toughness is reduced accordingly. How to solve the low compression ratio rolling production of the ultra-thick and ultra-high strength steel plate and ensure that the obdurability is well matched becomes an important direction.
The super-thick super-high strength steel plate produced by the continuous casting billet is limited by the conditions of the thickness of the continuous casting billet, the compression ratio and the like, and the thickness of the super-thick super-high strength steel plate is basically within 150 mm. For example, CN106319380 discloses a super-thick steel plate with a low compression ratio of 690MPa grade and a manufacturing method thereof, the maximum thickness of the steel plate is 115mm, and the steel plate with a thickness of more than 100mm needs three heat treatments such as normalizing, quenching and tempering.
Disclosure of Invention
In order to solve the technical problems, the invention provides a 690 MPa-grade super-thick steel plate with a low compression ratio, which comprises the following chemical components in percentage by mass: c: 0.06% -0.10%, Si: 0.20-0.50%, Mn: 1.45-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.20% -1.80%, Cu: 0.10% -0.40%, Mo: 0.10% -0.50%, Nb: 0.010% -0.050%, V: 0.001-0.040%, Ti: 0.001-0.020%, Al: 0.015 to 0.040 percent, and the balance of Fe and inevitable impurities.
The technical effects are as follows: the invention optimizes the proportion of each component, thereby preparing the super-thick and super-high strength steel plate with excellent low-temperature toughness, good matching of obdurability and 690MPa grade thickness of 120-160 mm.
The technical scheme of the invention is further defined as follows:
the super-thick steel plate with the low compression ratio of 690MPa is 320-440 mm in casting blank thickness, 120-160 mm in steel plate thickness and 2.67-2.75 in compression ratio.
The super-thick steel plate with the low compression ratio of 690MPa comprises the following chemical components in percentage by mass: c: 0.063% -0.08%, Si: 0.21-0.35%, Mn: 1.45-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.35% -1.50%, Cu: 0.10% -0.23%, Mo: 0.10% -0.30%, Nb: 0.010% -0.020%, V: 0.020-0.030%, Ti: 0.001-0.010%, Al: 0.015 to 0.020 percent, and the balance of Fe and inevitable impurities.
The super-thick steel plate with the low compression ratio of 690MPa comprises the following chemical components in percentage by mass: c: 0.09% -0.10%, Si: 0.42-0.45%, Mn: 1.53-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.55-1.64%, Cu: 0.25% -0.36%, Mo: 0.45-0.50%, Nb: 0.030-0.040%, V: 0.020-0.030%, Ti: 0.008% -0.015%, Al: 0.035 to 0.040 percent, and the balance of Fe and inevitable impurities.
The super-thick steel plate with the low compression ratio of 690MPa comprises the following chemical components in percentage by mass: c: 0.09% -0.10%, Si: 0.45-0.49%, Mn: 1.60-1.72%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.71% -1.80%, Cu: 0.35% -0.40%, Mo: 0.45-0.50%, Nb: 0.040% -0.050%, V: 0.030-0.040%, Ti: 0.018-0.020%, Al: 0.035 to 0.040 percent, and the balance of Fe and inevitable impurities.
The invention also aims to provide a manufacturing method of the super-thick steel plate with the low compression ratio of 690MPa, which comprises the steps of casting blank smelting → heating → rolling → quenching → tempering, wherein S is controlled to be less than or equal to 0.003 percent after molten iron desulphurization treatment, P is controlled to be less than or equal to 0.015 percent by a converter, and casting blank stacking is slowly cooled for more than 72 hours;
rough rolling, wherein the heating temperature of a casting blank is 1150-1250 ℃, the soaking time is 30-60 min, the initial rolling temperature of tapping is 1000-1100 ℃, the single reduction of the first three times of pressing is more than or equal to 35mm, the thickness of the rolled intermediate blank is 1.2-1.6 times of that of the finished product, and air cooling is carried out after rolling; second-fire rolling, namely heating the intermediate blank to 850-930 ℃ again, calculating the furnace time according to 1.0-1.5 min/mm, soaking the intermediate blank for 30-60 min, rolling the intermediate blank to the thickness of a finished product at the initial rolling temperature of 780-880 ℃, and then air-cooling the intermediate blank;
quenching, wherein the quenching temperature is 870-920 ℃, the in-furnace time is calculated according to 1.0-2.0 min/mm + (10-100 min), and water quenching is carried out to room temperature after discharging;
tempering, wherein the tempering temperature is 580-680 ℃, the in-furnace time is calculated according to 1.0-3.0 min/mm + (10-100 min), and air cooling is carried out after discharging.
The invention has the beneficial effects that:
(1) the present invention limits the chemical composition of the steel,
c is one of the main elements influencing the mechanical property of the high-strength steel, is the most economic and effective strengthening element in the steel, improves the strength of the steel through solid solution strengthening and precipitation strengthening, improves the carbon content and has adverse influence on the plasticity, toughness and welding property of the steel, and correspondingly improves the carbon equivalent and the sensitivity index of a welding seam due to the high carbon content, so the invention adopts the design of medium and low carbon content;
si is a necessary deoxidizing element for steelmaking, has a certain solid solution strengthening effect, and is not beneficial to the surface quality and low-temperature toughness of the steel plate due to excessively high silicon content;
mn has the functions of refining the structure and improving the strength and low-temperature toughness, and has low cost, and when the content of manganese is too high, the segregation of a continuous casting billet is easily caused;
ni can improve the strength, toughness and corrosion resistance of steel, inhibit carbon from desolventizing from austenite, reduce the precipitation tendency of grain boundary carbide, and obviously reduce the quantity of intercrystalline carbide, but the production cost can be obviously increased along with the increase of nickel content;
cu can inhibit the formation of polygonal ferrite and pearlite, promote the transformation of low-temperature structure bainite or martensite, and the excessive content of copper influences the toughness of steel and causes temper brittleness;
mo can effectively improve the hardenability of steel and is beneficial to refining the core structure of the extra-thick plate, but the alloy cost of the molybdenum is high, the cost is increased when the molybdenum is added in a large amount, and the toughness and the weldability are reduced;
the trace niobium has a pinning effect on austenite grain boundaries, inhibits recrystallization of deformed austenite, forms precipitates during cooling or tempering, improves strength and toughness, reduces toughness when the addition amount of the niobium is large, causes surface cracks of a continuous casting billet to be generated, and also has a deterioration effect on welding performance;
the strengthening elements in the V steel, namely VC and V (CN), are separated out and strengthened to obviously improve the strength and low-temperature toughness of the steel, and the vanadium can obviously improve the welding performance of the low-carbon alloy steel;
ti can fix gas nitrogen in steel to form titanium nitride, prevent crystal grains from growing in the heating, rolling and welding processes and improve the toughness of a base metal and a welding heat affected zone;
al is an important deoxidizing element, and trace aluminum is added into molten steel, so that the content of inclusions in the steel can be effectively reduced, and grains are refined;
the Mo, the Cu and the Ni are added in a composite manner, so that the strength can be improved, the low-temperature toughness can be improved, and the alloy cost is reduced compared with the single addition of the Ni;
(2) the invention breaks through the limitation of the compression ratio of the conventional process, and after necessary heat treatment, blanks with the thickness of 320-440 mm are used for producing steel plates with the thickness of 120-160 mm, and the compression ratio is 2.67-2.75;
(3) the maximum thickness of the steel plate reaches 160mm, the yield strength reaches 690MPa, the elongation is more than or equal to 18 percent, and the low-temperature impact KV2The Z-direction performance is excellent and meets the requirement of Z35 level when the temperature is higher than 40 ℃ and is more than 100J.
Drawings
FIG. 1 is a metallographic structure diagram of a steel sheet obtained in example 3 of the present invention.
Detailed Description
Example 1
The embodiment provides a 690 MPa-grade super-thick steel plate with a low compression ratio, the plate thickness is 120mm, and the chemical components and the mass percentage are as follows: c: 0.08%, Si: 0.21%, Mn: 1.50%, P: 0.009%, S: 0.002%, Ni: 1.50%, Cu: 0.23%, Mo: 0.30%, Nb: 0.020%, V: 0.030%, Ti: 0.010%, Al: 0.020% and the balance Fe and inevitable impurities.
The manufacturing method comprises the steps of casting blank smelting → heating → rolling → quenching → tempering, after the molten iron is desulfurized, the content of S is controlled to be 0.003 percent, the content of P is controlled to be 0.015 percent by a converter, and the casting blank is stacked and slowly cooled for 72 hours;
rough rolling, wherein the heating temperature of a casting blank is 1200 ℃, the soaking time is 45min, the initial rolling temperature of tapping is 1056 ℃, the single reduction of the first three-pass rolling is 36mm, the thickness of the rolled intermediate blank is 190mm, and air cooling is carried out after rolling;
second fire rolling, heating the intermediate blank to 900 ℃ again, calculating the furnace time according to 1.1min/mm, soaking for 30min, the initial rolling temperature is 850 ℃, the final rolling temperature is 840 ℃, and cooling in air after rolling to the thickness of a finished product;
quenching, wherein the quenching temperature is 910 ℃, the in-furnace time is 210min, and water quenching is carried out to the room temperature after discharging;
tempering at 640 deg.C for 280min, and air cooling.
Example 2
The embodiment provides a 690 MPa-grade super-thick steel plate with a low compression ratio, the plate thickness is 150mm, and the chemical components and the mass percentage are as follows: c: 0.09%, Si: 0.42%, Mn: 1.60%, P: 0.010%, S: 0.001%, Ni: 1.64%, Cu: 0.36%, Mo: 0.45%, Nb: 0.040%, V: 0.030%, Ti: 0.015%, Al: 0.040%, the balance being Fe and inevitable impurities.
The manufacturing method comprises the steps of casting blank smelting → heating → rolling → quenching → tempering,
controlling the content of S to be 0.0025 percent and the content of P to be 0.014 percent by a converter after the molten iron is desulfurized, and slowly cooling the casting blank stack for 72 hours;
rough rolling, wherein the heating temperature of a casting blank is 1200 ℃, the soaking time is 45min, the initial rolling temperature of tapping is 1056 ℃, the single reduction of the first three times of rolling is 42mm, the thickness of the rolled intermediate blank is 210mm, and air cooling is carried out after rolling;
second-fire rolling, heating the intermediate blank to 900 ℃ again, calculating the furnace time according to 1.1min/mm, soaking the intermediate blank for 30min, rolling at the beginning temperature of 800 ℃ and the finishing temperature of 820 ℃, and cooling the intermediate blank in air after rolling to the thickness of a finished product;
quenching, wherein the quenching temperature is 890 ℃, the in-furnace time is 270min, and water quenching is carried out to room temperature after discharging;
tempering at 640 deg.C for 300min, and air cooling.
Example 3
The embodiment provides a 690 MPa-grade super-thick steel plate with a low compression ratio, the thickness of the super-thick steel plate is 160mm, and the super-thick steel plate comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.49%, Mn: 1.60%, P: 0.008%, S: 0.002%, Ni: 1.80%, Cu: 0.40%, Mo: 0.50%, Nb: 0.050%, V: 0.040%, Ti: 0.018%, Al: 0.040%, the balance being Fe and inevitable impurities.
The manufacturing method comprises the steps of casting blank smelting → heating → rolling → quenching → tempering,
controlling the content of S to be 0.003 percent and the content of P to be 0.014 percent by a converter after molten iron desulfurization treatment, and slowly cooling a casting blank stack for 72 hours;
rough rolling, wherein the heating temperature of a casting blank is 1180 ℃, the soaking time is 60min, the initial rolling temperature of tapping is 1050 ℃, the single reduction of the first three times of rolling is 42mm, the thickness of the rolled intermediate blank is 210mm, and air cooling is carried out after rolling;
second-fire rolling, namely heating the intermediate blank to 855 ℃ again, calculating the furnace time according to 1.0min/mm, soaking the intermediate blank for 60min, rolling the intermediate blank at 800 ℃ and finishing the intermediate blank at 803 ℃, and then cooling the intermediate blank by air after the intermediate blank is rolled into a finished product;
quenching, wherein the quenching temperature is 890 ℃, the in-furnace time is 290min, and water quenching is carried out to room temperature after discharging;
tempering at 650 deg.C for 300min, and air cooling.
The mechanical properties of the steel sheets obtained in examples 1 to 3 are shown in table 1,
TABLE 1 mechanical Properties of examples of the invention
As can be seen from figure 1, the steel plate produced by the invention mainly comprises bainite and martensite, the maximum thickness reaches 160mm, and the compression ratio is 2.67-2.75; the yield strength reaches 690MPa grade, the yield strength is 710-743 MPa, the tensile strength is 813-839 MPa, the elongation is more than or equal to 18 percent, and the low-temperature toughness KV is KV2The temperature reaches above 100J (-40 ℃); the performance in the thickness direction is good, the requirement of Z35 level is met, the comprehensive performance is excellent, the strength and the toughness are matched well.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A690 MPa-grade super-thick steel plate with a low compression ratio is characterized by comprising the following chemical components in percentage by mass: c: 0.06% -0.10%, Si: 0.20-0.50%, Mn: 1.45-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.20% -1.80%, Cu: 0.10% -0.40%, Mo: 0.10% -0.50%, Nb: 0.010% -0.050%, V: 0.001-0.040%, Ti: 0.001-0.020%, Al: 0.015 to 0.040 percent, and the balance of Fe and inevitable impurities.
2. The super thick steel plate with the low compression ratio of 690MPa as claimed in claim 1, wherein: the thickness of the casting blank is 320-440 mm, the thickness of the steel plate is 120-160 mm, and the compression ratio is 2.67-2.75.
3. The super-thick steel plate with the low compression ratio of 690MPa according to claim 1, which comprises the following chemical components in percentage by mass: c: 0.063% -0.08%, Si: 0.21-0.35%, Mn: 1.45-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.35% -1.50%, Cu: 0.10% -0.23%, Mo: 0.10% -0.30%, Nb: 0.010% -0.020%, V: 0.020-0.030%, Ti: 0.001-0.010%, Al: 0.015 to 0.020 percent, and the balance of Fe and inevitable impurities.
4. The super-thick steel plate with the low compression ratio of 690MPa according to claim 1, which comprises the following chemical components in percentage by mass: c: 0.09% -0.10%, Si: 0.42-0.45%, Mn: 1.53-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.55-1.64%, Cu: 0.25% -0.36%, Mo: 0.45-0.50%, Nb: 0.030-0.040%, V: 0.020-0.030%, Ti: 0.008% -0.015%, Al: 0.035 to 0.040 percent, and the balance of Fe and inevitable impurities.
5. The super-thick steel plate with the low compression ratio of 690MPa according to claim 1, which comprises the following chemical components in percentage by mass: c: 0.09% -0.10%, Si: 0.45-0.49%, Mn: 1.60-1.72%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Ni: 1.71% -1.80%, Cu: 0.35% -0.40%, Mo: 0.45-0.50%, Nb: 0.040% -0.050%, V: 0.030-0.040%, Ti: 0.018-0.020%, Al: 0.035 to 0.040 percent, and the balance of Fe and inevitable impurities.
6. The manufacturing method of the super-thick steel plate with the low compression ratio of 690MPa applied to the claim 2 is characterized in that: comprises casting blank smelting → heating → rolling → quenching → tempering,
controlling S to be less than or equal to 0.003 percent after molten iron desulfurization treatment, controlling P to be less than or equal to 0.015 percent by a converter, and slowly cooling a casting blank by stacking for more than 72 hours;
rough rolling, wherein the heating temperature of a casting blank is 1150-1250 ℃, the soaking time is 30-60 min, the initial rolling temperature of tapping is 1000-1100 ℃, the single reduction of the first three times of pressing is more than or equal to 35mm, the thickness of the rolled intermediate blank is 1.2-1.6 times of that of the finished product, and air cooling is carried out after rolling;
second-fire rolling, namely heating the intermediate blank to 850-930 ℃ again, calculating the furnace time according to 1.0-1.5 min/mm, soaking the intermediate blank for 30-60 min, rolling the intermediate blank to the thickness of a finished product at the initial rolling temperature of 780-880 ℃, and then air-cooling the intermediate blank;
quenching, wherein the quenching temperature is 870-920 ℃, the in-furnace time is calculated according to 1.0-2.0 min/mm + (10-100 min), and water quenching is carried out to room temperature after discharging;
tempering, wherein the tempering temperature is 580-680 ℃, the in-furnace time is calculated according to 1.0-3.0 min/mm + (10-100 min), and air cooling is carried out after discharging.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112143968A (en) * | 2020-08-30 | 2020-12-29 | 五矿营口中板有限责任公司 | Ultra-thick X70M-grade double-resistance pipeline steel plate and manufacturing method thereof |
| WO2024001078A1 (en) * | 2022-06-29 | 2024-01-04 | 山东钢铁股份有限公司 | 80 mm thick 690 mpa-grade ultra-high strength and toughness marine steel plate and preparation method therefor |
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| WO2024001078A1 (en) * | 2022-06-29 | 2024-01-04 | 山东钢铁股份有限公司 | 80 mm thick 690 mpa-grade ultra-high strength and toughness marine steel plate and preparation method therefor |
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