A process for high efficiency steelmaking deoxidizing alloy

Abstract

The application discloses a high-efficiency steelmaking deoxidizing alloy process and belongs to the technical field of steelmaking, and comprises the following steps: S1, adjusting the content of manganese in steel to 0.10% to 0.6%; and adjusting the content of silicon in steel to 0.1% to 0.2%; S2, adjusting the diameter of a tapping hole to phi220mm, and adjusting the tapping time to 4.5 to 5 minutes; S3, optimizing oxygen lance nozzle parameters, adjusting the blowing angle to 13.5 degrees, and adjusting the flow to 42000 to 45000 cubic meters / hour; adjusting the converter bottom blowing flow to 700 to 800 cubic meters / hour; S4, lowering the overall oxygen lance position by 1.30 to 1.35m; and S5, adopting a slag blocking plug and yellow clay blocking process on the tapping hole after tapping is completed. The process can obviously improve the steelmaking output, improve the molten steel quality accordingly, realize the target of high-efficiency low-cost steelmaking deoxidizing alloy, and provide powerful technical support and guarantee for steelmaking production.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking technology, specifically relating to a high-efficiency process for deoxidizing steel alloys. Background Technology

[0002] Currently, most steel mills use top-blown steel with a strength of 3.5 Nm. 3 Within / t.min, bottom blow intensity 0.04Nm 3 Within a certain timeframe (e.g., smelting time is long, oxygen content at the smelting endpoint is high, slag has strong oxidizing properties and a large slag volume, making it impossible to achieve stable and efficient production at high efficiency and low cost.) Summary of the Invention

[0003] This invention provides a high-efficiency steelmaking deoxidation alloying process, which improves smelting efficiency and reduces alloy costs in steelmaking converters under normal production and operating conditions.

[0004] The purpose of this invention is to provide a high-efficiency steelmaking deoxidation alloying process, comprising:

[0005] S1. Adjust the composition of the steel: adjust the manganese content to 0.10%–0.6%; adjust the silicon content to 0.1%–0.2%.

[0006] S2. Adjust the tapping parameters: adjust the tapping nozzle diameter to φ220mm and the tapping time to 4.5-5 minutes;

[0007] S3. During the smelting process, optimize the oxygen lance nozzle parameters: adjust the blowing angle to 13.5 degrees and the flow rate to 42,000-45,000 cubic meters per hour; adjust the converter bottom blowing flow rate to 700-800 cubic meters per hour.

[0008] S4. Lower the oxygen lance position by 1.30–1.35m.

[0009] S5. Adopt the process of using slag-blocking plugs and yellow mud to block the tapping port after steel is tapped.

[0010] Preferably, the silicon and manganese content in the steel refers to their mass percentage, and the content range varies for different steel grades.

[0011] Preferably, the oxygen supply intensity of the oxygen lance is 3.80-3.91 cubic meters per minute per ton.

[0012] Preferably, the nominal capacity of the converter is 180 tons.

[0013] The advantages and positive effects of this invention are:

[0014] This invention solves the problems of low efficiency, high energy consumption, instability, and short effective reblowing life of converters in the smelting process, and establishes a multi-objective, efficient, and collaborative system for efficient, green, low-cost, and stable converter production. It provides valuable experience for steel smelting, effectively reduces smelting costs, and achieves significant direct economic benefits, with remarkable effects in composition optimization and tapping metallurgical processes. Through the development of processes to reduce alloy consumption, the key points of converter operation, endpoint control, and tapping metallurgical processes have been mastered. After its implementation, breakthroughs have been achieved in steel composition design. It provides ample technical reserves for the long-term development of steelmaking and has broad application value. Detailed Implementation

[0015] To further understand the invention's content, features, and effects, a detailed description is provided below:

[0016] The technical solution of this invention is as follows:

[0017] A high-efficiency steelmaking deoxidation alloying process includes:

[0018] S1. Composition Design Adjustment: The composition of the steel is appropriately adjusted, reducing the manganese (Mn) content to 0.10%-0.6% and the silicon (Si) content to 0.1%-0.2%. The optimal composition combination design is gradually refined to both reduce alloy consumption and meet steel performance requirements. The above content ranges apply to current mainstream steel grades, and the goal of reducing alloy consumption is achieved through appropriate combinations of different steel grades.

[0019] S2. The tapping nozzle diameter is increased from φ160mm to φ220mm, and the tapping time is reduced from 8 minutes to 4.5-5 minutes, effectively reducing tapping time and improving efficiency. The purpose of enlarging the tapping nozzle is to increase the unit output of steel, shorten the tapping time, and reduce the time the steel is exposed to air during tapping, thereby reducing oxygen and nitrogen content and ultimately minimizing alloy loss.

[0020] S3. During the smelting process, the oxygen lance nozzle parameters were optimized, the blowing angle was reduced from 15 degrees to 13.5 degrees, and the flow rate was increased from 38,000 cubic meters / hour to 42,000-45,000 cubic meters / hour, thereby increasing the stirring intensity of the molten steel.

[0021] S4, Slag Removal Technology: This technology targets the key slag removal process in converter smelting. It utilizes the overall reduction of the oxygen lance position by 1.30-1.35m to achieve good slag removal results and stable carbon extraction operation.

[0022] S5. During the tapping process, a new slag-blocking tapping technology is adopted, which involves using a slag-blocking plug and yellow mud to block the tapping port after tapping.

[0023] In the above embodiments, the blowing angle was adjusted from 15 degrees to 13.5 degrees, the oxygen flow rate was adjusted from 38,000 cubic meters per hour to 42,000-45,000 cubic meters per hour, the converter bottom blowing flow rate was adjusted from 400 cubic meters per hour to 700-800 cubic meters per hour, the tapping nozzle size was adjusted from φ160mm to φ220mm, the tapping time was reduced from 8 minutes to 4.5-5.0 minutes, the smelting cycle was reduced from 42 minutes / heat to 30-35 minutes / heat, and the alloy cost was reduced by 6.5-8.10 yuan / ton. This resulted in a significant increase in steelmaking output, a substantial reduction in alloy costs, and a corresponding improvement in steel quality, achieving the goal of high-efficiency, low-cost steelmaking deoxidation alloy production, and providing strong technical support and guarantee for steelmaking production.

[0024] High-efficiency, low-cost steelmaking deoxidation alloy composition technology provides technical support for efficient converter production, reduces alloy consumption, and offers valuable experience for steelmaking. It effectively reduces smelting costs and achieves significant direct economic benefits, particularly in high-intensity smelting and rapid tapping, as well as in composition optimization and tapping metallurgical processes. Through the development of processes to reduce alloy consumption, key operational points of converter operation, endpoint control, and tapping metallurgical processes have been mastered. The implementation of this technology has yielded breakthroughs in steel composition design. It provides ample technical reserves for the long-term development of steelmaking and has broad application value.

[0025] This technology solves the problems of low efficiency, high energy dissipation, instability, and high cost in the converter smelting process, and establishes a multi-objective, high-efficiency, and collaborative system for high-efficiency, low-cost, converter deoxidized alloy, and stable production.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency steelmaking deoxidation alloying process, characterized in that, include: S1. Adjust the composition of the steel: adjust the manganese content to 0.10%–0.6%; adjust the silicon content to 0.1%–0.2%. S2. Adjust the tapping parameters: adjust the tapping nozzle diameter to φ220mm and the tapping time to 4.5-5 minutes; S3. During the smelting process, optimize the oxygen lance nozzle parameters: adjust the blowing angle to 13.5 degrees and the flow rate to 42,000-45,000 cubic meters per hour; adjust the converter bottom blowing flow rate to 700-800 cubic meters per hour. S4. Lower the oxygen lance position by 1.30–1.35m. S5. Adopt the process of using slag-blocking plugs and yellow mud to block the tapping port after steel is tapped.

2. The process for high-efficiency steelmaking deoxidation alloys according to claim 1, characterized in that, The oxygen supply intensity of the oxygen lance is 3.80 to 3.91 cubic meters per minute (tons).

3. The process for high-efficiency steelmaking deoxidation alloying according to claim 1, characterized in that, The nominal capacity of the converter is 180 tons.