Control method for Ds inclusions of medium carbon sulfur-and-aluminum-containing deoxidized non-tempered steel

A non-quenched and tempered steel and control method technology, applied in the field of control of Ds inclusions in medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel, can solve problems such as inapplicability, reduced production rhythm, and aggravated level, and achieve good removal effect, High removal efficiency and strong stirring effect

Active Publication Date: 2020-05-19
ZENITH STEEL GROUP CORP
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Problems solved by technology

The high-alkalinity refining slag is not suitable for the production of sulfur-containing steel due to its strong desulfurization performance, and the deoxidation in batches and small batches in the LF refining process will cause the final deoxidized product to be small and difficult to float up and remove, which is not conducive to the reduction of oxygen content; in addition, RH vacuum The processing time and soft blowing time are both longer, which will also lead to an increase in temperature drop, affect the pourability of molten steel, and reduce the production rhythm
[0006] Publication No. CN 101906502 A discloses a calcium treatment method for reducing the size of D-type and Ds-type inclusions in aluminum-containing steel. The calcium treatment is actually adjusted to be carried out after the soft blowing is completed. For sulfur-containing non

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  • Control method for Ds inclusions of medium carbon sulfur-and-aluminum-containing deoxidized non-tempered steel
  • Control method for Ds inclusions of medium carbon sulfur-and-aluminum-containing deoxidized non-tempered steel
  • Control method for Ds inclusions of medium carbon sulfur-and-aluminum-containing deoxidized non-tempered steel

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Embodiment 1

[0034] This example uses the production process of non-quenched and tempered steel for sulfur-containing S45C shafts to illustrate the actual control effect of the present invention on Ds-type inclusions, and the content that is not specified is the conventional smelting process of sulfur-containing S45C.

[0035] Composition: C 0.46%, Si 0.25%, Mn 0.81%, S 0.028%, Al 0.018%, O 7.2ppm

[0036] (1) Converter smelting: 130t of converter steel, 0.08% C content, 0.020% S content, 1.0kg / t deoxidizer aluminum cake, silicon manganese alloy, silicon ferrosilicon alloy, vanadium iron alloy, recarburizer And 500kg lime + 300kg slagging agent.

[0037] (2) LF refining: energize the slag, take the initial sample to measure the composition of molten steel, adjust the aluminum content to 0.040%, and do not allow further adjustment of Al in the later stage of refining; the slag surface is diffused and deoxidized, and the slag composition is shown in Table 1; the S content of molten steel 0....

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Abstract

The invention discloses a control method for Ds inclusions of medium carbon sulfur-and-aluminum-containing deoxidized non-tempered steel. By adjusting the adding position of S and optimizing multi-component compositions of refined slag and molten steel compositions, on the premise of meeting the requirement of a product for oxygen, the inclusions are converted into a solid phase easy to float upwards, generation of liquid inclusions and CaS is avoided, the vacuum treatment time is further optimized, the removal efficiency of the inclusions, especially the large-particle Ds-type inclusions, inmolten steel is improved, the effect of controlling the Ds-type inclusions in the steel is achieved, and the Ds inclusions in a rolled material can be stably controlled to be 0.5 level or below duringactual production.

Description

technical field [0001] The invention relates to a method for controlling Ds inclusions in medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel. Background technique [0002] Non-quenched and tempered steel refers to the medium-carbon low-alloy structural steel whose properties are equal to or close to the mechanical properties of quenched and tempered steel by adding microalloying elements to change the phase transformation mechanism of the structure, and through rolling, forging and controlled cooling. Since the non-quenched and tempered steel can omit the quenching and tempering treatment process, compared with quenched and tempered steel, it can greatly save energy and reduce manufacturing costs by about 25%-38%. It is a steel material that is preferentially supported by national policies. And other aspects have been applied, such as automobile engine crankshaft, connecting rod. [0003] In order to ensure the fatigue performance of non-que...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/10C21C7/00C22C38/02C22C38/04C22C38/12
CPCC21C7/0006C21C7/0056C21C7/0087C21C7/06C21C7/10C22C38/02C22C38/04C22C38/12
Inventor 谢有孟晓玲邓向阳屈志东袁静李辉成
Owner ZENITH STEEL GROUP CORP
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