Method for producing nickel-based steel from high-phosphorus molten iron
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A hot metal, high phosphorus technology, applied in the field of iron and steel smelting, can solve the problems such as the difficulty of variety development, achieve the effect of meeting the needs of industrial production and optimizing the converter process
Active Publication Date: 2020-07-14
NANJING IRON & STEEL CO LTD
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Problems solved by technology
At present, the self-produced molten iron uses ores from Australia and Brazil, which have high phosphorus content. The stable produ
Method used
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Embodiment 1
[0064] This example provides a method for producing nickel-based steel with high-phosphorus molten iron, P in the molten iron: 0.136%, and the chemical composition and mass percentage of the smelted product are as follows: C: 0.042%, Si: 0.3%, Mn: 0.68%, Ni: 8.92%, Alt: 0.035%, S≤0.001%, P≤0.003%, N≤0.0035%, the balance Fe and non-removable impurities.
[0065] Specifically include the following steps:
[0066] S1. The loading capacity of molten iron is 153 tons. After pouring the tank, pre-treat the molten iron and perform desulfurization operation. After desulfurization, ensure that the slag is cleaned. S: 0.0020% of the molten iron;
[0067] S2. The nickel plate is put into the furnace together with the steel scrap, and the charging amount is 22 tons, of which the nickel plate adding amount is 14 tons;
[0068] S3. Carry out slag dumping operation after converter slag splashing, slag dumping and slag remaining, the amount of slag remaining is 3 tons, after the slag dumping...
Embodiment 2
[0080] This example provides a method for producing nickel-based steel with high-phosphorus molten iron, P in the molten iron: 0.142%, and the chemical composition and mass percentage of the smelted product are as follows: C: 0.039%, Si: 0.16%, Mn: 0.72%, Ni: 9.01%, Alt: 0.029%, S≤0.001%, P≤0.004%, N≤0.0039%, the balance Fe and non-removable impurities.
[0081] Specifically include the following steps:
[0082] S1. The loading capacity of molten iron is 149 tons. After the tank is poured, the molten iron is pretreated and desulfurized. After desulfurization, the slag is cleaned. S: 0.0020%;
[0083] S2. The nickel plate is put into the furnace together with the steel scrap, and the charging amount is 19 tons, of which the nickel plate adding amount is 14 tons;
[0084] S3. Perform slag dumping operation after converter slag splashing, slag dumping and slag remaining, 2 tons of slag remaining, after slag dumping, scrap steel with regular shape, no impurities and no oxidation ...
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Abstract
The invention discloses a method for producing nickel-based steel from high-phosphorus molten iron, and relates to the technical field of steel smelting. By adopting converter smelting, the P contentof used molten iron is 0.130% to 0.150%, by adopting a method of slag retention at the early stage and double slag at the later stage, the final smelting temperature is 1580-1620 DEG C, in the middleand later periods of smelting, the bottom stirring flow is 350-400 NL/min, the final slag alkalinity is 4.0, the final slag control amount is 10-12 tons, the converter decarburization rate is larger than or equal to 99%, and the dephosphorization rate is larger than or equal to 96%; and through LF refining, RH vacuum treatment, arc continuous casting machine pouring, by adopting TMCP rolling and ACC water cooling to 300 +/-20 DEG C, air cooling is performed to room temperature, a steel plate is heated to 550 +/-10 DEG C, tempering is performed for 3*h min, and air cooling is performed to roomtemperature. The converter process is optimized, a product is conveyed to a heating furnace to be heated after vacuum treatment and casting of an arc-shaped continuous casting machine, TMCP rolling and ACC water cooling are adopted, and after tempering treatment, performance detection is qualified.
Description
technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for producing nickel-based steel from high-phosphorus molten iron. Background technique [0002] With the fierce market competition, the domestic steel market share is gradually shrinking. In order to improve the competitiveness of enterprises, 9Ni steel, an advantageous variety, has been developed. With the rapid development of LNG transportation and storage technology, 9Ni steel has been widely used because of its excellent toughness at -196 °C ultra-low temperature environment. At present, the self-produced molten iron uses ore from Australia and Brazil, which has high phosphorus content. The stable production of molten iron normally has a phosphorus content of 0.130% to 0.150%, which brings great difficulties to the development of varieties. Contents of the invention [0003] The present invention aims at the above-mentioned technical problems, ove...
Claims
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