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Manufacturing method for steel ingot of axle steel

A manufacturing method and axle steel technology, applied in the field of steel ingot manufacturing, can solve problems such as poor stability, and achieve the effects of improving fatigue resistance, easy control, and easy implementation

Active Publication Date: 2013-09-25
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are some problems in the existing manufacturing method of axle steel, the main problem is that the stability of controlling the formation of crack source defects is poor, mainly due to the crack defects caused by inclusions near the surface of the steel ingot.

Method used

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  • Manufacturing method for steel ingot of axle steel
  • Manufacturing method for steel ingot of axle steel

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Embodiment 1-7

[0025] The concrete steps of manufacturing axle steel steel ingot are as follows (in embodiment 1-7, the addition of each raw material is shown in Table 1):

[0026] (1) Add 25-35 parts of steel scrap with Fe content ≥ 90wt% and 280-295 parts of molten iron with C content ≥ 3.8wt% and temperature ≥ 1200°C into the converter;

[0027] (2) Converter smelting: blowing in oxygen for smelting, when the C content in molten steel is 0.04-0.30wt%, and the molten steel temperature is 1660-1690°C, stop smelting;

[0028] (3) Add alloy: pour molten steel into the ladle; in the process of pouring out the molten steel, when 80 to 120 parts of the molten steel are poured out, add 1 to 1.5 parts of Si content ≥ 75wt% ferrosilicon alloy, 1.2 parts to the molten steel in the ladle ~1.6 parts of ferromanganese alloy with Mn content≥80wt%, 0.3~0.7 parts of aluminum-iron alloy with Al content≥50wt%, and 0.5~1.2 parts of carbon powder with C content≥99wt%;

[0029] (4) LF refining: Add 0.9-1.3 pa...

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Abstract

The invention discloses a manufacturing method for a steel ingot of axle steel. The manufacturing method comprises the following steps of: preparing raw materials, smelting in a converter, adding an alloy, refining in an LF (ladle furnace), treating by a vacuum degassing device, and casting. With the adoption of the manufacturing method for the steel ingot of axle steel disclosed by the invention, the quantity of inclusions on the near surface of the steel ingot can be greatly reduced, even the existence of the inclusions is hard to detect, so that the purity degree of steel is improved and the stability for controlling the generation of the metallurgical defects such as fatigue crack of the axle steel is effectively improved, thus improving the anti-fatigue performance of the axle steel.

Description

technical field [0001] The invention relates to an alloy manufacturing method, in particular to a steel ingot manufacturing method. Background technique [0002] Axle Steel Specialty steel used in the manufacture of railway locomotive and vehicle axles. Axle is a key component bearing the quality of locomotives and vehicles. Due to the complex stresses such as rotation, bending and impact during operation, fatigue cracking is the main form of failure. Therefore, the axle steel is required to have sufficient strength and toughness, and its requirements for various metallurgical defects that can be the source of axle cracks are very strict. The current manufacturing methods of axle steel mostly use electric furnace or small-scale converter to make steel, and then go through the composition adjustment process to adjust the composition of molten steel to the target range, and finally cast it into steel ingots. [0003] However, there are some problems in the existing manufactu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C5/28C21C7/10C21C7/072C21C7/076
CPCY02P10/20
Inventor 张建春王英均王俊凯施春月
Owner BAOSHAN IRON & STEEL CO LTD
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