CN112877597A - 13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and manufacturing method thereof - Google Patents
13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank and a manufacturing method thereof, relates to the technical field of steel production, and provides 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank, which comprises the following chemical components in percentage by mass: c: 0.10% -0.15%, Si: 0.20-0.40%, Mn: 1.30-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ni is 0.50-0.80%, Nb: 0.015% -0.050%, Ti: 0.006-0.020%, Cr: 0.10-0.30%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities. The microalloying technology is adopted to effectively reduce the size of inclusions, reduce the original austenite grain size refined structure grains, and through TMCP rolling and heat treatment processes, the product strength and low-temperature toughness are improved, and the welding performance of the steel plate is improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank and a manufacturing method thereof.
Background
China's economy is continuously developed, the dependence degree on resources is increased, domestic petroleum and natural gas resources cannot completely meet the production requirements, and a large number of petroleum and natural gas resources are imported. In order to store resources for a long time, various types of liquid hydrocarbon storage tanks are built in China, wherein the performance requirements of a large-capacity low-temperature storage tank on steel plates are extremely strict, the material of a large storage tank used in each country is basically a 9Ni steel storage tank, and the cost pressure is huge.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank, which comprises the following chemical components in percentage by mass: c: 0.10% -0.15%, Si: 0.20-0.40%, Mn: 1.30-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ni is 0.50-0.80%, Nb: 0.015% -0.050%, Ti: 0.006-0.020%, Cr: 0.10-0.30%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.32%, Mn: 1.42%, P: 0.012%, S: 0.0020%, Ni:0.56%, Nb: 0.033%, Ti: 0.016%, Cr: 0.190%, Al: 0.013%, Mg: 0.0012%, N: 0.0041% of Ca, and the balance of Fe and inevitable impurities.
The 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank comprises the following chemical components in percentage by mass: c: 0.11%, Si: 0.29%, Mn: 1.36%, P: 0.010%, S: 0.0020%, Ni:0.66%, Nb: 0.029%, Ti: 0.016%, Cr: 0.13%, Al: 0.0095%, Mg: 0.0009%, N: 0.0033%, Ca is not added, and the balance is Fe and inevitable impurities.
The 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank comprises the following chemical components in percentage by mass: c: 0.13%, Si: 0.31%, Mn: 1.39%, P: 0.012%, S: 0.0030%, Ni:0.61%, Nb: 0.019%, Ti: 0.0013%, Cr: 0.22%, Al: 0.008%, Mg: 0.0013%, N: 0.0029% and no Ca, the balance being Fe and unavoidable impurities.
Another object of the present invention is to provide a method for manufacturing 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank, comprising the steps of:
s1, performing desulfurization pretreatment on molten iron by adopting a KR method, blowing in a converter after slagging off, and ensuring that the sulfur content of the molten iron fed into the converter is less than or equal to 0.0020%;
s2, blowing by adopting a top-bottom combined blowing mode, wherein self-produced nickel-containing steel scraps are used, the nickel content of converter steel is 0.3-0.80%, and the steel tapping temperature is 1620-1660 ℃;
s3, lifting the molten steel to an LF furnace, heating to melt slag, adding lime and aluminum wires to make white slag, carrying out oxygen determination operation after alloying, and adding magnesium-aluminum alloy to carry out microalloying treatment after the oxygen content is less than 8 ppm;
s4, carrying out vacuum treatment when the molten steel reaches RH, wherein the vacuum keeping time is more than or equal to 15min, and the sedation time is more than or equal to 12min after the vacuum is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, wherein the austenitizing temperature is set to 1130 +/-10 ℃, the heating time is calculated according to the thickness of the blank by 9-12 min/cm, and the soaking time is more than or equal to 35 min;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature is 1010-1080 ℃, the secondary rolling temperature is 850-950 ℃, the final rolling temperature is 800-900 ℃, the water inlet temperature is 750-800 ℃, and the red return temperature is 600-700 ℃;
and S8, normalizing the steel plate at 900-920 ℃, air-cooling to room temperature after normalizing, tempering at 600-650 ℃ at high temperature after the steel plate reaches the room temperature, and cooling to the room temperature after tempering for surface inspection and label delivery.
In the aforementioned method for manufacturing 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank, in step S3, the magnesium content of the magnesium-aluminum alloy is 20% to 30%, and the magnesium content after magnesium treatment is 0.0010% to 0.0020%.
The invention has the beneficial effects that:
(1) the invention adopts an oxygen blowing converter for smelting and LF refining treatment, adopts magnesium aluminum alloy for microalloying treatment after deoxidation and alloying, and then hoists to RH for vacuum post-treatment after treatment, molten steel is calmed for not less than 12min after vacuum is finished, a casting blank with high cleanliness is obtained by slab continuous casting, the size of impurities in the molten steel is effectively reduced by magnesium aluminum alloy treatment, the quantity of sulfides in the molten steel is reduced, a low-temperature austenitizing process, a TMCP rolling process and a normalizing and tempering process are adopted by continuous casting, and the product meets the requirements of customers through performance detection;
(2) the KR process and the converter smelting method are adopted, so that the sulfur content is effectively controlled, the converter alloys manganese and nickel, and the refining temperature and rhythm are stabilized;
(3) the method adopts the precipitation deoxidation of the magnesium-aluminum alloy, promotes the denaturation of A-type and B-type inclusions, reduces the total oxygen content in molten steel, and improves the purity of the molten steel;
(4) the high vacuum condition of the invention promotes the direction reaction of the impurity denaturation, reduces the content of free gas in the molten steel, and most impurities smaller than 10 mu m are obtained by the molten steel treated by magnesium microalloying, and the impurities are beneficial to the damage in the steel;
(5) the invention adopts the steel plate with magnesium components, and in the process of structure transformation, magnesium modified precipitates become heterogeneous nucleation cores, and the steel plate has the advantages of crystal grain segmentation, structure refinement and performance improvement;
(6) after magnesium treatment, the content of dissolved oxygen in steel is obviously reduced, magnesium aluminate spinel inclusions are formed by the dissolved oxygen and aluminum inclusions, the magnesium aluminate spinel inclusions are dispersed in a matrix of the steel, the strength and the quality of the steel are improved, magnesium and sulfur are combined to form MgS inclusions, A inclusions are effectively spheroidized, and the damage of the MnS inclusions to the performance of steel is improved;
(7) according to the invention, through normalizing treatment and tempering treatment, the internal stress of the steel plate is eliminated, the banded structure of the steel plate is improved, the structure is more uniform and fine, and the welding performance is more excellent.
Drawings
FIG. 1 is a metallographic structure diagram of example 1 of the present invention.
Detailed Description
Example 1
The 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.32%, Mn: 1.42%, P: 0.012%, S: 0.0020%, Ni:0.56%, Nb: 0.033%, Ti: 0.016%, Cr: 0.190%, Al: 0.013%, Mg: 0.0012%, N: 0.0041% of Ca, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, performing desulfurization pretreatment on the molten iron by adopting a KR method, and blowing the molten iron into a converter after slagging off to ensure that the sulfur content of the molten iron in the converter is 0.0012%;
s2, blowing by adopting a top-bottom combined blowing mode, wherein the self-produced nickel-containing steel scrap is used, the nickel content of converter tapping is 0.43%, and the tapping temperature is 1651 ℃;
s3, lifting molten steel to an LF furnace, heating to melt slag, adding lime and aluminum wire to make white slag, performing oxygen determination operation after alloying, adding magnesium-aluminum alloy after the oxygen content is 5ppm to perform microalloying treatment, wherein the magnesium content of the magnesium-aluminum alloy is 20-30%, and the magnesium content is 0.0010-0.0020% after the magnesium treatment is finished;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 16min, and calming for 13min after the vacuum is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, setting the austenitizing temperature to 1131 ℃, calculating the heating time according to the thickness of the blank by 10min/cm, and soaking the blank for 36 min;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature is 1033 ℃ for the outlet rolling, the secondary rolling temperature is 910 ℃, the final rolling temperature is 885 ℃, the water inlet temperature is 792 ℃, and the red return temperature is 668 ℃;
and S8, normalizing the steel plate at the normalizing temperature of 915 ℃, air-cooling the steel plate to room temperature after normalizing, tempering the steel plate at high temperature after the steel plate reaches the room temperature, tempering at the tempering temperature of 636 ℃, and cooling the steel plate to the room temperature after tempering for surface inspection and label delivery treatment.
Example 2
The difference between the 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank provided in this example and example 1 is that the chemical components and mass percentages are as follows: c: 0.11%, Si: 0.29%, Mn: 1.36%, P: 0.010%, S: 0.0020%, Ni:0.66%, Nb: 0.029%, Ti: 0.016%, Cr: 0.13%, Al: 0.0095%, Mg: 0.0009%, N: 0.0033%, Ca is not added, and the balance is Fe and inevitable impurities.
Example 3
The difference between the 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank provided in this example and example 1 is that the chemical components and mass percentages are as follows: c: 0.13%, Si: 0.31%, Mn: 1.39%, P: 0.012%, S: 0.0030%, Ni:0.61%, Nb: 0.019%, Ti: 0.0013%, Cr: 0.22%, Al: 0.008%, Mg: 0.0013%, N: 0.0029% and no Ca, the balance being Fe and unavoidable impurities.
The mechanical property test results of the steel sheets obtained in examples 1 to 3 are shown in the following table 1:
TABLE 1 mechanical property test results of products of examples
| Examples | Y.S(MPa) | T.S(MPS) | A％ | Yield ratio | Mean value of transverse impact |
| Example 1 | 403 | 530 | 31 | 76 | 249 |
| Example 2 | 424 | 541 | 30 | 78 | 349 |
| Example 3 | 445 | 574 | 32 | 78 | 272 |
The inclusion of the steel sheets obtained in examples 1 to 3 is shown in Table 2 below:
TABLE 2 inclusions in the products of the examples
Therefore, the invention carries out deep research according to standards such as API, EN4620 and the like, designs and develops a low-cost high-benefit manufacturing material with 0.5 percent of Ni content, adopts a magnesium microalloying technology to improve the form of endogenetic inclusions for international advanced products, thereby improving the internal quality of the products, improving the mechanism of austenite nucleation, effectively refining the structure grain size, obtaining low-temperature carbon manganese fine-grained steel through TMCP rolling technology and high-temperature tempering after normalizing treatment, effectively improving the product performance through welding test detection, meeting the standard requirements of national key engineering projects, and becoming the first enterprise for designing and developing the steel for the low-cost high-capacity low-temperature liquid hydrocarbon storage tank with 0.5 percent of Ni in the world.
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. The 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank is characterized in that: the chemical components and the mass percentage are as follows: c: 0.10% -0.15%, Si: 0.20-0.40%, Mn: 1.30-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ni is 0.50-0.80%, Nb: 0.015% -0.050%, Ti: 0.006-0.020%, Cr: 0.10-0.30%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
2. The 13MnNi6 steel for a cryogenic liquid hydrocarbon storage tank according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.12%, Si: 0.32%, Mn: 1.42%, P: 0.012%, S: 0.0020%, Ni:0.56%, Nb: 0.033%, Ti: 0.016%, Cr: 0.190%, Al: 0.013%, Mg: 0.0012%, N: 0.0041% of Ca, and the balance of Fe and inevitable impurities.
3. The 13MnNi6 steel for a cryogenic liquid hydrocarbon storage tank according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.11%, Si: 0.29%, Mn: 1.36%, P: 0.010%, S: 0.0020%, Ni:0.66%, Nb: 0.029%, Ti: 0.016%, Cr: 0.13%, Al: 0.0095%, Mg: 0.0009%, N: 0.0033%, Ca is not added, and the balance is Fe and inevitable impurities.
4. The 13MnNi6 steel for a cryogenic liquid hydrocarbon storage tank according to claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.13%, Si: 0.31%, Mn: 1.39%, P: 0.012%, S: 0.0030%, Ni:0.61%, Nb: 0.019%, Ti: 0.0013%, Cr: 0.22%, Al: 0.008%, Mg: 0.0013%, N: 0.0029% and no Ca, the balance being Fe and unavoidable impurities.
5. A manufacturing method of 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank is characterized by comprising the following steps: application to any of claims 1-4, comprising the steps of:
s1, performing desulfurization pretreatment on molten iron by adopting a KR method, blowing in a converter after slagging off, and ensuring that the sulfur content of the molten iron fed into the converter is less than or equal to 0.0020%;
s2, blowing by adopting a top-bottom combined blowing mode, wherein self-produced nickel-containing steel scraps are used, the nickel content of converter steel is 0.3-0.80%, and the steel tapping temperature is 1620-1660 ℃;
s3, lifting the molten steel to an LF furnace, heating to melt slag, adding lime and aluminum wires to make white slag, carrying out oxygen determination operation after alloying, and adding magnesium-aluminum alloy to carry out microalloying treatment after the oxygen content is less than 8 ppm;
s4, carrying out vacuum treatment when the molten steel reaches RH, wherein the vacuum keeping time is more than or equal to 15min, and the sedation time is more than or equal to 12min after the vacuum is finished;
s5, lifting the molten steel after static stirring to continuous casting for casting, adopting a gas-permeable nozzle to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, checking the surface quality of the blank after the blank is cooled in a heap for 48 hours, and processing to ensure that the surface quality meets the requirements;
s6, heating the qualified blank in a stepping heating furnace, wherein the austenitizing temperature is set to 1130 +/-10 ℃, the heating time is calculated according to the thickness of the blank by 9-12 min/cm, and the soaking time is more than or equal to 35 min;
s7, rolling by using a single-stand reversible rolling mill, wherein the initial rolling temperature is 1010-1080 ℃, the secondary rolling temperature is 850-950 ℃, the final rolling temperature is 800-900 ℃, the water inlet temperature is 750-800 ℃, and the red return temperature is 600-700 ℃;
and S8, normalizing the steel plate at 900-920 ℃, air-cooling to room temperature after normalizing, tempering at 600-650 ℃ at high temperature after the steel plate reaches the room temperature, and cooling to the room temperature after tempering for surface inspection and label delivery.
6. The method of manufacturing 13MnNi6 steel for low temperature liquid hydrocarbon storage tanks, according to claim 5, wherein: in the step S3, the magnesium content of the magnesium-aluminum alloy is 20% to 30%, and the magnesium content after the magnesium treatment is finished is 0.0010% to 0.0020%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110023687.0A CN112877597A (en) | 2021-01-08 | 2021-01-08 | 13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and manufacturing method thereof |
| PCT/CN2021/108019 WO2022148003A1 (en) | 2021-01-08 | 2021-07-23 | 13mnni6 steel for cryogenic liquid hydrocarbon storage tank and manufacturing method therefor |
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| CN202110023687.0A CN112877597A (en) | 2021-01-08 | 2021-01-08 | 13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853219A (en) * | 2021-01-08 | 2021-05-28 | 南京钢铁股份有限公司 | 13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and smelting method thereof |
| CN114411044A (en) * | 2022-01-19 | 2022-04-29 | 南京钢铁股份有限公司 | Method for manufacturing steel for pressure vessel with low welding crack sensitivity |
| CN114737130A (en) * | 2022-04-29 | 2022-07-12 | 鞍钢股份有限公司 | 355 MPa-grade low-temperature steel and manufacturing method thereof |
| WO2022148003A1 (en) * | 2021-01-08 | 2022-07-14 | 南京钢铁股份有限公司 | 13mnni6 steel for cryogenic liquid hydrocarbon storage tank and manufacturing method therefor |
| CN115747616A (en) * | 2022-11-29 | 2023-03-07 | 南京钢铁股份有限公司 | Smelting method of P690QL2 marine storage tank steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115717222A (en) * | 2022-11-16 | 2023-02-28 | 包头钢铁（集团）有限责任公司 | Production method of steel for V-N alloying A350LF6 flange |
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| CN115747616A (en) * | 2022-11-29 | 2023-03-07 | 南京钢铁股份有限公司 | Smelting method of P690QL2 marine storage tank steel |
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| WO2022148003A1 (en) | 2022-07-14 |
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