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Deoxidation and alloying method for free-cutting steel smelting

A free-cutting steel and alloying technology, applied in the field of free-cutting steel, can solve the problems of reduced alloy yield, low active oxygen, and high active oxygen content, so as to increase alloy yield, reduce smelting costs, and improve Adjusting the effect of efficiency

Active Publication Date: 2022-07-15
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2), lead free cutting steel
However, this deoxidation and alloying method is easy to remove the active oxygen to too low, and it is difficult to effectively increase oxygen in the subsequent smelting process; or the active oxygen content after deoxidation is too high, resulting in continuous adjustment of the oxygen content in the LF refining process, resulting in The deoxidizer consumption of 1215 series free-cutting steel increases, the smelting efficiency decreases, and the alloy yield decreases, which eventually leads to an increase in smelting costs

Method used

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  • Deoxidation and alloying method for free-cutting steel smelting
  • Deoxidation and alloying method for free-cutting steel smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Chemical composition

[0036] The chemical composition is designed as C: 0.07%, Si: 0.04%, Mn: 1.22%, P: 0.05%, S: 0.39%, Cr: 0.04%, Ni: 0.03%, Cu: 0.05%, [O ]: 37ppm.

[0037] 2. Blast furnace ironmaking

[0038] The blast furnace uses sintered iron ore as the main raw material, which is smelted into molten iron as the main raw material for free-cutting steel smelting.

[0039] 3. Primary refining of converter

[0040] The initial smelting process of the converter uses blast furnace molten iron and scrap steel as the charge, of which molten iron accounts for 90%, scrap accounts for 10%, and the total furnace capacity is 150 tons. The converter first blows oxygen to oxidize and remove elements such as C and Si (remove C to 0.04%~0.06%, and remove Si to ≤0.08%), and then create low-basicity slag (basicity 2.4~2.8) and ensure the slag Sufficient amount. The tapping temperature of the converter is 1618 ° C, and the tapping C is controlled at 0.05%; no deoxidizer is...

Embodiment 2

[0046] Replace "silicon-manganese consumption 600kg / furnace, low-carbon ferromanganese consumption 1500kg / furnace" in step 3 of Example 1 with "silicon-manganese consumption 600kg / furnace, low-carbon ferromanganese consumption 1400kg / furnace", other conditions are the same as in Example 1 .

Embodiment 3

[0048] 1. Chemical composition

[0049] The chemical composition is designed as C: 0.08%, Si: 0.06%, Mn: 1.35%, P: 0.08%, S: 0.36%, Cr: 0.08%, Ni: 0.02%, Cu: 0.09%, [O ]: 35ppm.

[0050] 2. Blast furnace ironmaking

[0051] The blast furnace uses sintered iron ore as the main raw material, which is smelted into molten iron as the main raw material for free-cutting steel smelting.

[0052] 3. Primary refining of converter

[0053]In the primary smelting process of the converter, blast furnace molten iron and scrap steel are used as the charge, of which molten iron accounts for 90%, scrap accounts for 10%, and the total furnace capacity is 145 tons. The converter first blows oxygen to oxidize and remove elements such as C and Si, and then produces low-basicity slag (basicity 2.5-2.8) and ensures that the amount of slag is sufficient. The converter tapping temperature is 1616 ℃, and the tapping C is controlled at 0.06%; no deoxidizer is added during the tapping process, silic...

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Abstract

The invention belongs to the technical field of free-cutting steel, and particularly relates to a deoxidation and alloying method for free-cutting steel smelting. The free-cutting steel comprises the following elements in percentage by weight: less than or equal to 0.09% of C, less than or equal to 0.08% of Si, 1.10-1.40% of Mn, 0.04-0.09% of P, 0.33-0.42% of S, less than or equal to 0.20% of Cr, Ni and Cu, 30-40ppm of active oxygen in the steel, and the balance of iron and inevitable impurities. The smelting process of the free-cutting steel comprises the steps of blast furnace ironmaking, converter primary smelting, LF refining and small square billet continuous casting. By optimizing deoxidation and alloying schemes in the smelting process, the molten steel oxygen content adjusting efficiency is effectively improved, consumption of a deoxidizing agent is reduced, the alloy yield is increased, and the smelting cost of the free-cutting steel is reduced.

Description

technical field [0001] The invention belongs to the technical field of free-cutting steel, and in particular relates to a deoxidation and alloying method for smelting free-cutting steel. Background technique [0002] Free-cutting steel refers to an alloy steel that adds a certain amount of one or more elements such as sulfur, phosphorus, lead, calcium, selenium, tellurium, etc., which are beneficial to turning, to improve its machinability, and belong to special steel. The development of modern industry for automation, high speed and precision requires steel with good machining performance to improve production efficiency and adapt to mass production. [0003] At present, free-cutting steel is widely used in the manufacture of instruments, watch parts, automobiles, machine tools and other various machines that are subject to less force and require strict size and roughness; Standard parts with relatively low requirements, such as printer shafts, bolts, valves, bushings, pin...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/42C22C33/06C21C7/00C21C7/06
CPCC22C38/02C22C38/04C22C38/60C22C38/42C22C33/06C21C7/0006C21C7/06C21C7/0075
Inventor 苏振伟周淼屠兴圹黄云飞林俊
Owner ZENITH STEEL GROUP CORP
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