Smelting method of steel for hypoxia axle

A technology for axle steel and smelting methods, applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of large fluctuations in the quality of axle steel, oxygen content and inclusion control levels that are difficult to achieve stably, and improve comprehensive performance Effect

Active Publication Date: 2012-11-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
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Problems solved by technology

The quality of axle steel produced by the existing low-oxygen smelting method for axle steel has large fluctuations, an

Method used

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  • Smelting method of steel for hypoxia axle

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Example Embodiment

[0046] Example

[0047] This embodiment produces steel for high-speed motor car axles. The requirements for the mass percentage and oxygen content of the steel are as follows:

[0048] C 0.20~0.30%; Si 0.15~0.40%; Mn 0.50~0.80%; P≤0.020%;

[0049] S≤0.015%; Cr 0.90~1.20%; Mo 0.20~0.30%; V ≤0.06%;

[0050] Al ≤0.050%; [O] ≤20×10 -6 . The rest is Fe and inevitable impurities.

[0051] This embodiment is the following sequential steps:

[0052] 1 Electric furnace smelting

[0053] (1) Electric furnace charging: first add 6 tons of high-quality steel scrap into the electric furnace, the scrap steel (weight) P≤0.025%, S≤0.030%, the surface of the scrap steel is dry, free of oil and impurities, and the overall size is ≤800mm×500mm. Then pour 54 tons of pretreated molten iron into the electric furnace, and put the pretreated molten iron (weight) P 0.060% and S 0.040% into the furnace, and the molten iron temperature is 1260℃.

[0054] (2) Oxygen blowing in the electric furnace, blowing oxygen ...

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Abstract

The invention relates to a smelting method of steel for a hypoxia axle, which comprises the following steps that: I. smelting by using an electric furnace: scrap steel and pre-treated hot metal are added into the electric furnace, the oxygen blowing is carried out, and then a slagging material is added; the oxygen blowing is continuously carried out, and the eccentric bottom tapping of the electric furnace is adopted; a deoxidizer, ferroalloy and a slagging agent are added into a ladle before tapping; the hot metal is poured into the ladle; II. refining in a ladle furnace: before ladle refining, an Al wire is quickly fed for deoxy treatment; the ladle enters an LF(Ladle Furnace) station, Ar gas is blown from the bottom of the furnace, and calcium carbide is added; power is supplied to raise the temperature; reducing white slag is made in the ladle; Al powder and synthetic slag are added for diffusible desoxydation; in a white slag state, the time is kept within more than 15 minutes, the ladle goes out of an LF station; and III. VD (Vacuum Distillation) vacuum refining: the ladle enters a VD station; Ar gas is blown from the bottom under the high degree of vacuum; after VD treatment, an Al wire is fed; a covering agent is added; Ar gas is blown from the bottom, and soft stirring is carried out; the ladle goes out of the station; and steel is poured. According to the smelting method of steel for the hypoxia axle, the content of oxygen in the steel can be reduced to not more than 15 * 10<-6>.

Description

technical field [0001] The invention relates to a method for smelting low-oxygen axle steel, mainly a method for controlling the oxygen content in the production process of the axle steel. Background technique [0002] Axle is one of the important load-bearing components of railway trains, and its quality and reliability are directly related to the high-speed driving safety of railway trains. High-speed train axles have very high requirements on steel purity and fatigue resistance. At present, all the axles of my country's high-speed motor vehicles are imported from abroad, and there is still a blank in this field in China. [0003] Oxygen, as a harmful element, should be strictly controlled in steel. Studies have shown that oxygen and non-metallic oxides in steel will reduce the fatigue strength and impact toughness of steel, and it is also the origin of fatigue failure cracks. Therefore, the oxygen content and non-metallic oxides in the steel should be reduced as much a...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C5/52C21C7/10
CPCY02P10/20
Inventor 邬中华王玉玲王之香
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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