13MnNi6 steel for low-temperature liquid hydrocarbon storage tank and manufacturing method thereof
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A technology of low-temperature liquid state and manufacturing method, applied in the direction of manufacturing tools, manufacturing converters, furnace types, etc., can solve problems such as high cost pressure, achieve the effect of improving performance, refining structure, and reducing quantity
Inactive Publication Date: 2021-06-01
NANJING IRON & STEEL CO LTD
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Problems solved by technology
In order to store resources for a long time, various types of liquid hydrocarbon storage tanks have been built in my country. Among them, large-capacity low-temperature storage tanks have extremely strict requirements on the performance of steel plates. At present, the materials of large-scale storage tanks used in various countries are basically 9Ni steel storage tanks, and the cost is pressured. huge
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Embodiment 1
[0028] A 13MnNi6 steel for low-temperature liquid hydrocarbon storage tank provided in this example, its chemical composition and 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%, Ca is not added, and the balance is Fe and unavoidable impurities.
[0029] The manufacturing method includes the following steps:
[0030] S1. The molten iron is pretreated by KR method for desulfurization. After removing the slag, it is blown in the converter to ensure that the sulfur content of the molten iron is 0.0012%;
[0031] S2. Blowing is carried out by top-bottom combined blowing, using self-produced nickel-containing scrap steel, the nickel content of the converter tapping is 0.43%, and the tapping temperature is 1651°C;
[0032] S3. After lifting the molten steel to the LF furnace, heat up the slag treatment, add lime and aluminum wire to make white slag, and carry o...
Embodiment 2
[0039] The difference between the 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank provided in this example and Example 1 is that its chemical composition and 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%, no Ca is added, the balance is Fe and unavoidable impurities.
Embodiment 3
[0041] The difference between the 13MnNi6 steel for a low-temperature liquid hydrocarbon storage tank provided in this example and Example 1 is that its chemical composition and 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%, no Ca is added, the balance is Fe and unavoidable impurities.
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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 the 13MnNi6 steel for the low-temperature liquid hydrocarbon storage tank. The steel is prepared from, by mass, 0.10-0.15% of C, 0.20-0.40% of Si, 1.30-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0050% of S, 0.50-0.80% of Ni, 0.015-0.050% of Nb, 0.006-0.020% of Ti, 0.10-0.30% of Cr, 0.005-0.015% of Al, 0.0008-0.0015% of Mg, less than or equal to 0.0050% of N and the balance of Fe and inevitable impurities without Ca. The microalloying technology is adopted to effectively reduce the size of inclusions, and reduce original austenite grain size and refine structure grains, and through a TMCP rolling and heat treatment technology, the product strength and low-temperature toughness are improved, and the welding performance of the steel plate is improved.
Description
technical field [0001] The invention relates to the technical field of iron and steel production, in particular to 13MnNi6 steel for low-temperature liquid hydrocarbon storage tanks and a manufacturing method thereof. Background technique [0002] my country's economy continues to develop and its dependence on resources is increasing. Domestic oil and natural gas resources cannot fully meet the needs of production, and a large amount of oil and natural gas resources are imported. In order to store resources for a long time, various types of liquid hydrocarbon storage tanks have been built in my country. Among them, large-capacity low-temperature storage tanks have extremely strict requirements on the performance of steel plates. At present, the materials of large-scale storage tanks used in various countries are basically 9Ni steel storage tanks, and the cost is pressured. huge. Contents of the invention [0003] The present invention aims at the above technical problems, ...
Claims
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