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Method for producing molybdenum-containing steel through converter

A converter and molybdenum steel technology, applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of high labor intensity and increased workload, avoid molten steel stirring, improve molten steel purity, and reduce manual labor intensity. Effect

Inactive Publication Date: 2019-06-18
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The addition of precious alloy ferromolybdenum, nickel plate, and copper plate to the LF refining furnace of Nanjing Iron and Steel No. The summer heat and the solar terms increase the workload

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, the steel type Q890-2 is selected, and the molybdenum content required by the composition characteristics of the steel type is 0.52% to 0.58%. The molybdenum content in the molybdenum oxide ball is tested by the laboratory system, and the test value is 59.5%. The amount of molten steel added is 157.78t , the added molybdenum oxide balls are packaged in drums, each drum weighs 250kg, and the target value of molybdenum content in this steel is 0.55%. This method is now used to produce Q890-2 molybdenum-containing steel with a converter. The specific process is as follows:

[0016] Step 1: Confirm the production plan of the steel grade Q890-2. The molybdenum content required by the composition characteristics of the steel grade Q890-2 is 0.52% to 0.58%. Through the formula (the upper limit of the smelting composition of the steel grade × the amount of molten steel) ÷ (molybdenum oxide ball Molybdenum content × 98.4%) to calculate the upper limit of addin...

Embodiment 2

[0021] In this embodiment, the steel type Q960-1 is selected, and the molybdenum content required by the composition characteristics of the steel type is 0.54% to 0.60%. Tons, the added molybdenum oxide balls are packed in barrels, with a weight of 250kg per barrel. The target value of the molybdenum content of this steel type is 0.56%. This method is now used to produce Q890-2 molybdenum-containing steel type by converter. The specific process is as follows:

[0022] Step 1: Confirm the production plan of the steel grade Q960-1. The molybdenum content required by the composition characteristics of the steel grade Q960-1 is 0.54% to 0.60%. Through the formula (the upper limit of the smelting composition of the steel grade × the amount of molten steel) ÷ (molybdenum oxide ball Molybdenum content × 98.4%) to calculate the upper limit of adding molybdenum oxide balls to take an integer value of 1634kg, calculated by the formula (lower limit of steel smelting composition × molten s...

Embodiment 3

[0027] In this embodiment, steel type 111 is selected, and the molybdenum content required by the composition characteristics of the steel type is 0.35% to 0.45%. The molybdenum content in the molybdenum oxide ball is tested by the laboratory system, and the test value is 59.5%. The amount of molten steel added is 159.17 tons. The added molybdenum oxide balls are packed in drums, each drum weighs 250kg, and the target molybdenum content of this steel grade is 0.56%. This method is now used to produce 111 molybdenum-containing steel grades, and the specific process is as follows:

[0028]Step 1: Confirm the production plan of steel type 111. The molybdenum content required by the composition characteristics of steel type 111 is 0.35% to 0.45%. Through the formula (the upper limit of the smelting composition of the steel type × the amount of molten steel) ÷ (the molybdenum content of the molybdenum oxide ball × 98.4%) to calculate the upper limit of adding molybdenum oxide balls,...

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Abstract

The invention discloses a method for producing molybdenum-containing steel through a converter. The method comprises the following steps that (1) the upper limiting quantity and the lower limiting quantity of added molybdenum oxide balls are calculated out according to the upper limiting value and the lower limiting value of the molybdenum content in smelting steel components and a calculation formula; (2) the molybdenum oxide balls with the added quantity calculated out are added into a waste steel hopper to be fed into the converted along with waste steel, and then prepared molten iron is mixed; (3) after mixing is finished, normal converter smelting operation is carried out, when the smelting final temperature components meet the steel tapping requirement, whether the molybdenum contentin the molten steel is within the upper limiting value and lower limiting value range required by the molybdenum content in the steel smelting components or not is confirmed, it is confirmed that themolybdenum content does not exceed the upper limiting value, no molybdenum-containing alloy needs to be added to the molten steel if the conditions are met, and the fourth step is carried out if themolybdenum content is lower than the lower limiting value of the range; and (4) the molten steel in the third step is fed to a refining furnace, a ferro-molybdenum alloy is added for microalloying operation, the added quantity of the ferro-molybdenum alloy is calculated out according to the formula, and the molybdenum content in the finial components of the molten steel meets the steel component requirement.

Description

technical field [0001] The invention relates to a method for producing molybdenum-containing steel by a converter. Background technique [0002] The addition of precious alloy ferromolybdenum, nickel plate, and copper plate to the LF refining furnace of Nanjing Iron and Steel No. In the summer heat, the workload is even more intense. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for producing molybdenum-containing steel with a converter in view of the above shortcomings of the prior art. By adding molybdenum oxide balls to the converter, the labor intensity of the refining furnace is greatly reduced, and the precious alloy can be refined. The chemical process is moved forward; at the same time, it also avoids the stirring of the molten steel caused by the long-term alloying operation of the refining furnace and the frequent lowering of the electrode, and improves the purity of the molten steel. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00
CPCY02P10/20
Inventor 张红军周桂成张振杰曹余良张小伟解生元周孝伟
Owner NANJING IRON & STEEL CO LTD