CN110468326B - Ultrathin 16MnDR steel plate for LNG storage tank and manufacturing method thereof - Google Patents
Ultrathin 16MnDR steel plate for LNG storage tank and manufacturing method thereof Download PDFInfo
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- B22—CASTING; POWDER METALLURGY
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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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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- C21D1/26—Methods of annealing
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- C21D1/84—Controlled slow cooling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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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
- 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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Abstract
The invention relates to an ultrathin 16MnDR steel plate for an LNG storage tank, which has the following tensile strength Rm: 490-620MPa, yield strength Rel is not less than 315MPa, and elongation A is not less than 21%; and at the temperature of minus 40 ℃, the impact absorption energy KV2 of the transverse impact test sample is more than or equal to 27J; the samples were bent at room temperature under the conditions of D-2 a and b-2 a: the bending angle is 180 degrees, and no crack exists; the sample is subjected to 5.0% elongation cold deformation, and then is subjected to artificial aging treatment at 250 ℃ for 1 hour, and the impact absorption energy KV2 of the transverse and longitudinal impact samples is more than or equal to 27J at the temperature of minus 40 ℃. The wall plate is particularly suitable for the wall plate of the LNG large-scale storage tank, and has better low-temperature performance and long-term stable service performance. The continuous casting billet is adopted for production, and H expansion is carried out on the continuous casting billet in a covering and slow cooling mode, so that the H expansion problem of the thin steel plate is solved. The rough rolling and the controlled rolling of the steckel mill are adopted, so that the temperature and the temperature uniformity of the whole plate during the rolling of the steel plate are ensured, the control precision of the rolling is improved, and the problem of overlarge temperature difference between the head and the tail of the plate is avoided particularly in the later stage.
Description
Technical Field
The invention relates to a thin iron-based alloy steel plate, in particular to a manufacturing method of an ultrathin 16MnDR steel plate with the thickness of 5 mm.
Background
LNG (liquefied natural gas) is the most important clean energy at present, but there are obvious peaks and troughs in the use process, and in order to stabilize LNG supply, a large-capacity LNG storage tank needs to be built for peak shaving. The LNG storage tank generally has the capacity of 8-20 ten thousand cubic meters, the design service life is 50 years, and in the whole using process, the maintenance and repair links are not reserved from the design angle. Therefore, the LNG storage tank has very high requirements for the material of the whole tank body, and the steel plate is required to have uniform and stable properties and have a large margin in the performance under extreme conditions (such as earthquake).
The 16MnDR is a steel plate number for a low-temperature pressure vessel in GB/T3531, and for a 5mm 16MnDR steel plate, the standard is stipulated only for the steel plate composition, and the tensile properties and the workability of the steel plate are not specified, and it is clear that the steel plate having a thickness of less than 6mm is not subjected to an impact test.
The middle width plate at the bottom of the outer tank of the LNG storage tank and the lining plate on the wall of the outer tank are designed to be 16MnDR with the thickness of 5mm, and from the safety point of view, the mechanical property and the technological property of the steel plate must be agreed, namely, on the basis that the chemical components meet GB 3531, the indexes such as the mechanical property and the technological property must meet the design and actual requirements.
At present, no research report is found on 16MnDR steel plates with the thickness specification of 5mm or thinner. The researchers proposed "a normalized type 16MnDR low temperature pressure vessel steel plate and a method for manufacturing the same" (patent publication No. CN102605241A), which does not mention the thickness range, but the range of application examples is 6 to 120mm, and which is strengthened by adding a certain amount of V element. Researchers have proposed "a 120mm low temperature pressure vessel steel 16MnDR thick plate and a method for producing the same" (patent publication No. CN102345054A), which produces a 120mm thick gauge 16MnDR steel plate by die casting.
The above patents are all explained for the invention and the manufacturing process of the thick gauge 16MnDR, but the application discusses the 5mm thick gauge 16MnDR steel plate for the LNG storage tank and the production process thereof, which combines the characteristics of the steel plate and the use thereof:
firstly, the steel plate is used in key parts and has requirements on the mechanical property and the technological property of the steel plate;
secondly, the rolling direction of the steel plate is the horizontal direction of the tank body wall plate, and the width direction of the steel plate is the vertical direction of the tank body wall plate, so that the longitudinal direction of the steel plate is the main stress direction, and the longitudinal mechanical property is particularly important;
thirdly, the ultra-long service life of the storage tank requires that the 16MnDR steel plate has certain performance stability;
and fourthly, for the steel plate with the thickness of 5mm, the mass of the core part of the blank is one of important properties in the comprehensive properties of the steel plate.
Disclosure of Invention
Aiming at the difficulties and urgent needs of engineering in reality, the invention develops a 5 mm-thick 16MnDR steel plate with low temperature toughness, the steel plate can especially meet the design requirements of an LNG storage tank, and the design components of the steel plate still meet the requirements of GB 3531-; tensile strength Rm of transverse and longitudinal samples of the steel plate: 490-620MPa, yield strength Rel is not less than 315MPa, and elongation A is not less than 21%; and at the temperature of minus 40 ℃, the impact absorption energy KV2 of a transverse impact test sample (the size of the test sample is 3.33mmX10mmX55mm) is more than or equal to 27J; bending the sample at normal temperature under the conditions that D is 2a and b is 2a, wherein the bending angle is 180 degrees, and no crack exists; the sample is subjected to 5.0% elongation cold deformation, and then is subjected to artificial aging treatment at 250 ℃ for 1 hour, and the impact absorption energy KV2 of a transverse and longitudinal impact sample (the size of the sample is 3.33mmX10mmX55mm) is more than or equal to 27J at the temperature of minus 40 ℃, so that the sample has stronger performance stability. And the carbon equivalent CEV corresponding to the chemical components is less than or equal to 0.43, so that the steel plate has good weldability.
The specific technical scheme of the invention is as follows: an ultra-thin gauge (5mm thickness) 16MnDR steel sheet based on Fe and comprising the following chemical composition (in mass%): c: 0.10 to 0.20 percent; si: 0.15-0.30%; mn: 1.20-1.50%; p: less than or equal to 0.015 percent; s: less than or equal to 0.005 percent; al: more than or equal to 0.020%; ni: 0.10-0.30%; h is less than or equal to 1 ppm; as + Sb + Bi + Sn + Pb is less than or equal to 0.10 percent; carbon equivalent CEV is less than or equal to 0.43.
The function and amount of the components contained in the present invention are specifically described below:
c: c and Fe are elements necessary for ensuring the strength of the steel sheet, and form a cementite structure of Fe3C in the steel, which is a component of pearlite, so C can effectively improve the strength of the steel. However, too high C content is disadvantageous in ductility and toughness of steel and significantly increases carbon equivalent of material to thereby be disadvantageous in weldability of steel sheets. The invention controls the carbon content to be 0.10-0.20%.
Si: is a deoxidizing element in steel and improves the strength of steel in a solid solution strengthening mode. When the Si content is less than 0.10%, the deoxidation effect is poor, and when the Si content is high, the toughness and the welding performance are reduced. The Si content of the invention is controlled to be 0.15-0.30%.
Mn: the solid solution strengthening effect is achieved, but firstly, when the content of Mn is too high, the carbon equivalent is increased, so that the welding performance is damaged; mn can improve the hardenability of the steel plate, and for the steel plate with the thickness of 5mm, the cooling rate on a cooling bed is high, and the excessive Mn content can cause the abnormal structure of the local area of the steel plate; and thirdly, Mn is combined with S, segregation is easily generated in the center of the slab to form lamellar MnS inclusions, and the impact toughness of the steel plate is unstable. Therefore, the Mn content of the invention is controlled to be 1.20-1.50%.
Ni: is a beneficial element which can obviously improve the low-temperature toughness, and has obvious influence on impact toughness and ductile-brittle transition temperature. Therefore, the content of the organic silicon compound is controlled to be 0.10-0.30%.
Al: mainly has the functions of deoxidation and grain refinement. Al and [ O ] in molten steel]、[N]Formed by bonding (Al)2O3) And (AlN) enters the slag to realize the purposes of deoxidation and nitrogen; very little residual Al in the steel2O3The grains act as second phase particles in the steel to refine the grains. Therefore, the content (Alt) of the compound is controlled to be more than 0.020.
H: is one of the most harmful elements in steel, and two H atoms form H in steel2Molecule, H2The molecules are gathered together to generate larger pressure, microcracks are formed in weak links in the steel plate, and the microcracks are macroscopically expressed as white spots, so that the steel plate is embrittled. Therefore, the content thereof is controlled to be not more than 1ppm by the present invention.
S, P: is a harmful impurity element in steel, and is easy to form defects of segregation, inclusion and the like. The content of the impurity element is preferably as small as possible, because the impurity element adversely affects the toughness (particularly, the toughness of the core) of the steel sheet and the toughness of the weld heat-affected zone. The invention controls P to be less than or equal to 0.015 percent and S to be less than or equal to 0.005 percent, and the inclusion morphology is spheroidized and uniformly distributed by a Ca treatment technology, thereby reducing the influence of the Ca treatment technology on the toughness and ensuring the Z-direction performance of the steel plate.
The manufacturing method of the ultrathin 16MnDR steel plate comprises the following steps:
firstly, smelting molten steel, namely adopting a converter, LF external refining, RH vacuum treatment, CC continuous casting blank forming and blank stack slow cooling. Then, the rolling process adopts a steckel mill controlled rolling process to produce; the heat treatment adopts continuous furnace normalizing heat treatment. The details are as follows
Preparing smelting raw materials according to the chemical composition, sequentially carrying out KR molten iron pretreatment, converter smelting, LF refining, RH refining and continuous casting to produce high-purity molten steel, and using an optimized continuous casting process (low casting superheat degree, low blank drawing speed and reasonable soft reduction parameters) to produce a continuous casting slab with low center segregation, looseness and 150mm thickness. Because the steel plate with the thickness of 5mm does not have the condition of H expanding by slow cooling after rolling, the H expanding treatment is carried out by covering the continuous casting billet with slow cooling after the continuous casting is finished, thereby further improving the core quality of the continuous casting billet and ensuring the uniform and stable performance of the steel plate.
And (5) cleaning the surface of the continuous casting billet with temperature after slow cooling.
Heating the continuous casting slab to 1180-1280 ℃, and preserving heat for 1-2 hours to ensure that alloy elements in the steel are fully dissolved in solid solution to ensure the uniformity of the components and the performance of a final product, removing scale by using high-pressure water after the continuous casting slab exits from a furnace, then carrying out two-stage rolling, wherein the first-stage rolling is rough rolling, the final three-pass single-pass reduction rate is more than or equal to 30%, and the cumulative total is more than 60%, so as to ensure that the core defects of the continuous casting slab are fully combined, thereby ensuring the performance of a steel plate; the second-stage rolling is finish rolling, the furnace coil rolling is adopted, the temperature of the curling furnace is 850-. After the rolling is finished, the cooling bed is cooled in air and then is taken off the line.
Normalizing the rolled steel plate, wherein the heat treatment is carried out in a continuous furnace, the normalizing heating temperature is 860-930 ℃, the furnace time is 20-50min, and the steel plate is air-cooled after being taken out of the furnace.
Compared with the prior art, the invention has the advantages that:
compared with the prior products and technologies, the invention has the advantages that:
(1) the mechanical property, the processing property and the like of the produced 16MnDR steel plate with the thickness of 5mm can meet the severe requirements on the longitudinal mechanical property when the product is used as a storage tank wall plate such as LNG and the like for construction.
(2) The impact toughness of the produced 5mm thick 16MnDR is not changed after strain aging, and the long-term stable service of the steel plate is ensured.
(3) This product adopts the continuous casting billet production to adopt the mode of covering slow cooling to expand H to the continuous casting billet, solved the H difficult problem that expands of this steel sheet of thin specification.
(3) The rough rolling and the controlled rolling of the steckel mill are adopted, so that the temperature and the temperature uniformity of the whole plate during the rolling of the steel plate are ensured, the control precision of the rolling is improved, and the problem of overlarge temperature difference between the head and the tail of the plate is avoided particularly in the later stage.
Drawings
FIG. 1 is a time versus temperature slow cooling curve for a typical slab.
Detailed Description
The present invention will be described in further detail with reference to examples. The examples are merely illustrative of preferred embodiments of the invention and are not intended to limit the scope of the invention in any way.
Example 1
The steel sheet of example 1 had a thickness of 5 mm.
The production process of the steel plate with the thickness of 5mm comprises the following steps:
preparing a smelting raw material according to the chemical composition of example 1 in Table 1, and sequentially carrying out KR molten iron pretreatment, converter smelting, LF refining, RH refining, 150mm continuous casting, continuous casting billet covering and slow cooling, continuous casting billet cleaning, continuous casting billet heating, heat preservation treatment, high-pressure water descaling, controlled rolling, straightening and heat treatment.
And (2) covering and stacking the high-temperature slab out of the continuous casting machine for slow cooling, wherein the covering inlet temperature is not lower than 800 ℃, the slow cooling time is not lower than 60H, the covering outlet temperature is not higher than 400 ℃, a typical slow cooling curve of slab time and temperature is shown in figure 1, and the slow cooling step aims at reducing the H content in steel.
Further, the specific process of the heating, controlled rolling and cooling stages for rolling the plate blank into the steel plate comprises the following steps: heating the continuous casting slab to 1180-grade 1280 ℃, preserving heat for 1-2 hours, removing scale by high-pressure water after discharging, and then carrying out two-stage rolling. The initial rolling temperature of the first stage rolling (namely rough rolling) is 1070 ℃, the rolling is carried out for 5 passes, and the thickness of the intermediate billet is 20 mm; the second stage is finish rolling, furnace coil rolling is adopted, rolling is carried out for 6 passes, the temperature of a curling furnace is 900-. Straightening after rolling, air cooling on a cooling bed, and inserting the wire.
And (3) putting the completely cooled steel plate into a continuous furnace for normalizing heat treatment, heating at 900 ℃, keeping the temperature in the furnace for 30min, and cooling in static air.
The finished steel sheets formed by the above manufacturing process are excellent in overall properties, as shown in tables 2 and 3 for details.
Example 2
Example 2 relates to a steel sheet having a thickness of 5 mm.
The production process of the steel plate with the thickness of 5mm comprises the following steps:
steel plate slab making and slab stacking slow cooling were identical to those of example 1.
The specific process of the heating, controlled rolling and cooling stages for rolling the continuous casting billet into the steel plate comprises the following steps: heating the blank to 1180-1280 ℃, preserving heat for 1-2 hours, removing scale by high-pressure water after discharging, and then rolling in two stages: the initial rolling temperature of the first stage rolling (rough rolling) is 1050 ℃, the rolling is carried out for 7 passes, and the thickness of the intermediate billet is 30 mm; the second stage rolling is finish rolling, furnace coil rolling is adopted, rolling is carried out for 6 passes, the temperature of a curling furnace is 880-. Straightening after rolling, air cooling on a cooling bed, and inserting the wire.
And (3) putting the completely cooled steel plate into a continuous furnace for normalizing heat treatment, heating at 870 ℃, keeping the temperature in the furnace for 20min, and cooling in static air.
The finished steel sheets formed by the above manufacturing process are excellent in overall properties, as shown in tables 2 and 3.
TABLE 1 examples Final product chemistry (% by weight)
TABLE 2 mechanical Properties (delivery state) of the steel sheets produced in the examples
TABLE 3 mechanical Properties (after strain aging) of the steel sheets produced in the examples*)
*: the specimens were cold deformed at 5.0% elongation and then artificially aged at 250 ℃ for 1 hour.
Aiming at the urgent need of the construction of the LNG storage tank at present, the invention uses reasonable chemical component design; producing a continuous cast slab with low center segregation and porosity in combination with a continuous casting process; matching with a large reduction rolling process; the heat treatment process is optimized, the 16MnDR steel plate with the thickness specification of 5mm and the guaranteed mechanical property and process performance is manufactured, and the steel plate is particularly suitable for the wall plate of the LNG large-scale storage tank and has better low-temperature performance and long-term stable service performance.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A manufacturing method of an ultrathin 16MnDR steel plate for an LNG storage tank is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) smelting molten steel: KR molten iron pretreatment, converter smelting, LF refining and RH refining are sequentially carried out to produce high-purity molten steel, and the steel plate comprises the following chemical components: the steel plate takes Fe as a basic element and comprises the following chemical components in percentage by weight: c: 0.10 to 0.20 percent; si: 0.15-0.30%; mn: 1.20-1.50%; p: less than or equal to 0.015 percent; s: less than or equal to 0.005 percent; al: 0.020-0.04%; ni: 0.10-0.30%; h is less than or equal to 1 ppm; as + Sb + Bi + Sn + Pb is less than or equal to 0.10 percent;
(2) continuously casting into a blank, covering the continuously cast blank with a cover, slowly cooling, and cleaning the surface with the temperature;
(3) rolling: heating the continuous casting slab to 1180-grade 1280 ℃, preserving heat for 1-2 hours to fully dissolve alloy elements in steel, descaling the continuous casting slab after discharging by using high-pressure water, and producing by adopting a controlled rolling process of a steckel mill: the first stage is rough rolling, the cumulative compression ratio is more than 60%, and the thickness of the intermediate billet is 20-30 mm; the second stage is finish rolling, the furnace coil is adopted for rolling, the temperature of a curling furnace is 850-;
(4) and (3) heat treatment: normalizing, and cooling in air.
2. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: and (4) normalizing, wherein the heat treatment is carried out in a continuous furnace, the normalizing heating temperature is 860-930 ℃, the furnace time is 20-50min, and the air cooling is carried out after the furnace is taken out.
3. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: and (3) covering the continuous casting slab with the thickness of 150mm, slowly cooling the continuous casting slab to 400 +/-20 ℃ for H expanding treatment, and cleaning the surface of the slowly cooled continuous casting slab at the temperature of more than 150 ℃.
4. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: in the step (3), the reduction rate of the final three single passes of rough rolling is more than or equal to 30 percent.
5. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: tensile strength Rm of the steel plate in the transverse and longitudinal directions: 490-620MPa, yield strength Rel is not less than 315MPa, and elongation A is not less than 21%; and at the temperature of minus 40 ℃, the impact absorption energy KV2 of the transverse impact test sample is more than or equal to 27J; the samples were subjected to room temperature bending under D =2a, b =2a conditions: the bending angle is 180 degrees, and no crack exists; the sample is subjected to 5.0% elongation cold deformation, then is subjected to artificial aging treatment at 250 ℃ for 1 hour, the impact absorption energy KV2 of the transverse and longitudinal impact samples is not less than 27J at the temperature of minus 40 ℃, and the specification of the sample is tested by transverse and longitudinal impact energy: 3.33 mm. times.10 mm. times.55 mm.
6. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: the thickness of the steel plate is as thin as 5 mm.
7. The method of manufacturing an ultra-thin gauge 16MnDR steel sheet for an LNG storage tank of claim 1, wherein: the chemical components of the steel plate are Fe as basic elements, and the steel plate comprises the following chemical components in percentage by weight: c: 0.10 to 0.20 percent; si: 0.15-0.30%; mn: 1.20-1.50%; p: less than or equal to 0.015 percent; s: less than or equal to 0.005 percent; al: 0.020-0.04%; ni: 0.10-0.30%; h is less than or equal to 1 ppm; as + Sb + Bi + Sn + Pb is less than or equal to 0.10 percent; the CEV is less than or equal to 0.43, so that the solderability is realized.
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| CN101144138B (en) * | 2007-11-01 | 2011-05-25 | 济南钢铁股份有限公司 | Producing method of steel plate for low temperature pressure container and thereof |
| CN102605241A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Normalizing type 16MnDR low temperature pressure vessel steel plate and manufacturing method thereof |
| KR101736638B1 (en) * | 2015-12-23 | 2017-05-30 | 주식회사 포스코 | Pressure vessel steel plate with excellent hydrogen induced cracking resistance and manufacturing method thereof |
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