Smelting process for producing ultralow-carbon phosphor nickel series steel by high-phosphor molten iron

An ultra-low carbon, molten iron technology, applied in the field of iron and steel smelting, can solve problems such as difficulty in variety development, and achieve the effects of meeting the needs of batch industrial production, avoiding instability, and reducing phosphorus content

Inactive Publication Date: 2020-07-28
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the self-produced molten iron uses ore from Australia and Brazil, which has a 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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This example provides a smelting process for producing ultra-low-carbon phosphorus-nickel 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.

[0052] Specifically include the following steps:

[0053] 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;

[0054] 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;

[0055] S3. Carry out slag dumping operation after converter slag splashing, slag dumping and slag remaining, the amount of slag remaining i...

Embodiment 2

[0063] This example provides a smelting process for producing ultra-low-carbon phosphorus-nickel 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.

[0064] Specifically include the following steps:

[0065] 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%;

[0066] 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;

[0067] 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,...

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PUM

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Abstract

The invention discloses a smelting process for producing ultralow-carbon phosphor nickel series steel by high-phosphor molten iron, and relates to the technical field of steel smelting. The smelting process adopts converter smelting, and phosphor content of the used molten iron is 0.130%-0.150%; a way of leaving slag at an early stage and using a dual-slag process at a later stage is adopted, a smelting terminal temperature is 1580-1620 DEG C, bottom stirring flow at the middle and later period of smelting is 350-400 NL/min, final basicity of slag is 4.0, final slag control amount is 10-12 tons, a converter decarburization rate greater than or equal to 99% is realized, and a dephosphorization rate greater than or equal to 96% is achieved. The converter process is optimized, and the nickelseries steel smelting process meets batch industrial production needs.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a smelting process for producing ultra-low-carbon phosphorus-nickel 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 a 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C5/34C21C7/00C21C7/06C21C7/064C21C7/068C22C38/02C22C38/04C22C38/06C22C38/08
CPCC21C5/34C21C7/0006C21C7/06C21C7/064C21C7/068C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08Y02P10/20
Inventor 翟冬雨吴俊平方磊
Owner NANJING IRON & STEEL CO LTD
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