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A method for producing nickel-based steel from high-phosphorus molten iron
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A molten iron and high phosphorus technology, applied in the field of iron and steel smelting, can solve problems such as difficulty in variety development, and achieve the effects of avoiding instability, stable blowing and high purity
Active Publication Date: 2022-03-22
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 production of molten iron has a phosphorus content of 0.130% to 0.150%, which brings great difficulties to the development of varieties.
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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, which relates to the technical field of iron and steel smelting. It uses a converter for smelting, and the P content of the molten iron used is 0.130% to 0.150%. The end point temperature is 1580-1620°C, the bottom stirring flow rate in the middle and later stages of smelting is 350-400NL / min, the final slag basicity is 4.0, and the final slag control amount is 10-12 tons. The decarburization rate of the converter is ≥99%, and the dephosphorization rate is ≥96%. ; After LF refining, RH vacuum treatment, arc castingmachinecasting, TMCP rolling, ACC water cooling to 300±20°C and air cooling to room temperature, steel plate heating to 550±10°C, tempering for 3×h minutes, air cooling to room temperature. The converter process is optimized, the product is vacuum treated, cast by the arc continuous castingmachine, and then sent to the heating furnace for heating, TMCP rolling and ACC water cooling are adopted, and the performance test is qualified after tempering treatment.
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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