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Very low phosphorus and very low sulfur steelmaking method

A technology of extremely low and molten steel, which is applied in the manufacture of converters, etc., and can solve the problems of high phosphorus and sulfur content in the final molten steel composition

Active Publication Date: 2019-02-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The invention provides a very low-phosphorus and very-low-sulfur steelmaking method, aiming to solve the problem of high phosphorus and sulfur contents in the molten steel composition at the end point

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 adopts the method of the present invention to make steel

[0054] Raw materials: molten iron containing vanadium and titanium, the main components are

[0055] C: 4.4%, Si: 0.22%, Mn: 0.20%, V: 0.17%, Ti: 0.25%, S: 0.080%, P: 0.075%, the balance is TFe, and the temperature is 1270°C.

[0056] The first step is desulfurization and slag removal: in this step, the dosage of magnesium powder injection is 1.1kg / t iron, and the dosage of passivation lime is 4.0kg / t iron. The sulfur content of molten iron after treatment is 0.0075%.

[0057] The second step process, dephosphorization and vanadium extraction at the same time in the vanadium extraction converter: in this step, the amount of lime added is 15kg / t steel, the amount of cold solidified pellets is 40kg / t steel, and the oxygen consumption is 12.5m3 / t steel. The steel temperature is 1390°C. The composition of the obtained semi-steel contains: C: 3.4%, Si: 0.01%, Mn: 0.01%, V: 0.02%, Ti: 0.02%, S: 0.0075%...

Embodiment 2

[0063] Embodiment 2 adopts the method of the present invention to make steel

[0064] Raw materials: molten iron containing vanadium and titanium, the main components are

[0065] C: 3.5%, Si: 0.1%, Mn: 0.1%, V: 0.05%, Ti: 0.05%, S: 0.060%, P: 0.06%, the balance is TFe, and the temperature is 1250°C.

[0066] The first step is desulfurization and slag removal: in this step, the dosage of magnesium powder injection is 0.9kg / t iron, and the dosage of passivation lime is 3.5kg / t iron. The sulfur content of molten iron after treatment is 0.007%.

[0067] The second step process, dephosphorization and vanadium extraction at the same time in the vanadium extraction converter: in this step process, the amount of lime added is 10kg / t steel, the amount of cold solidified pellets is 30kg / t steel, and the oxygen consumption is 10m 3 / t steel, semi-steel temperature is 1350 ℃. The composition of the obtained semi-steel contains: C: 3%, Si: 0.01%, Mn: 0.01%, V: 0.02%, Ti: 0.001%, S: 0.0...

Embodiment 3

[0073] Embodiment 3 adopts the method of the present invention to make steel

[0074] Raw materials: molten iron containing vanadium and titanium, the main components are

[0075] C: 4.8%, Si: 1.0%, Mn: 1.0%, V: 0.4%, Ti: 0.5%, S: 0.10%, P: 0.08%, the balance is TFe, and the temperature is 1390°C.

[0076] The first step is desulfurization and slag removal: in this step, the amount of magnesium powder sprayed is 1.2kg / t iron, and the amount of passivated lime is 4.5kg / t iron. The sulfur content of molten iron after treatment is 0.009%.

[0077] The second step process, dephosphorization and vanadium extraction at the same time in the vanadium extraction converter: in this step process, the amount of lime added is 20kg / t steel, the amount of cold solidified pellets is 50kg / t steel, and the oxygen consumption is 15m 3 / t steel, semi-steel temperature is 1450°C. The composition of the obtained semi-steel contains: C: 4%, Si: 0.02%, Mn: 0.02%, V: 0.04%, Ti: 0.03%, S: 0.005%, P:...

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Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a low-phosphorus and low-sulfur steelmaking method. As for the problem that in steel smelted in the prior art, the content of harmful phosphorus and sulfur is high, the low-phosphorus and low-sulfur steelmaking method is provided. Molten iron used for steelmaking is vanadium and titanium containing molten iron. The method includes the steps that desulfuration and deslagging are conducted; dephosphorization and vanadium extraction are conducted through a vanadium extraction converter at the same time; carbon-catching double-slag steelmaking is conducted through a semisteel converter; stirring dephosphorization is conducted through an LF furnace; lime injection and deslagging are conducted; and deoxygenation and desulfuration are conducted through the LF furnace, wherein the steps are sequentially executed. By limiting parameters in each step, the phosphorus content in terminal molten iron compositions can be decreased to 0.001% or below, and the sulfur content in the terminal molten iron compositions is decreased to 0.0005% or below at the same time.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to an extremely low phosphorus and extremely low sulfur steelmaking method. Background technique [0002] With the rapid development of economic construction, the market has higher and higher requirements for the performance of steel, which promotes the development of pure steel production technology. The purity of steel has undergone a qualitative leap since the 1990s. The five major elements [P], [S], [O], [N], and [H] in Japan's Nippon Steel and South Korea's Pohang deep-drawing steel are total The optimal level of content has also reached 60×10 -6 . Although the domestic iron and steel metallurgical industry has made great progress in the past two decades, and new equipment and new technologies have been widely used and promoted, there is still a large performance gap between domestic steel and foreign high-quality steel, and the purity of steel is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/064C21C7/06C21C5/28C22C38/60C22C38/12C22C38/14C22C38/02C22C38/04
Inventor 梁新腾曾建华陈永陈均
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP