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Method for preparing spring steel

A technology of spring steel and molten steel, applied in the field of preparing spring steel

Active Publication Date: 2010-06-23
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of production method that can be used for preparing 60Si2Mn (A) spring steel in order to overcome the shortcoming that the preparation method of spring steel of prior art can not be used for 60Si2Mn (A) spring steel, can greatly improve The inherent quality of spring steel makes the fatigue life of the spring connector for railway vibration reduction reach 5 million times

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0009] According to the method for preparing spring steel of the present invention, the method comprises blowing molten iron, then tapping the molten steel into a ladle for refining, degassing the refined molten steel, and casting the degassed molten steel forming, the refining method includes deoxidation and slag adjustment to the molten steel and steel slag in the ladle, wherein the deoxidation method includes adding the first deoxidizer before the completion of the converter tapping and adding the first deoxidizer to the steel after the completion of the tapping Add a second deoxidizer to the liquid, the first deoxidizer is a deoxidizer that does not contain Al, the amount of the first deoxidizer is such that the amount of FeO+MnO in the steel slag is not more than 2.5% by weight, and the second deoxidizer The deoxidizer is aluminum, and the amount of the second deoxidizer is such that the content of Als in the molten steel is 0.02-0.04% by weight, and the Als is acid-solubl...

Embodiment 1

[0029] This example is used to illustrate the preparation method of spring steel according to the present invention.

[0030] (1) 135 tons of molten iron (which contains 3.5% by weight of C, 0.018% by weight of S) is added to a 120-ton converter for blowing, and 6.1 tons of lime is added in the blowing process to make slag, and the amount of carbon in the molten steel at the end of blowing is controlled. The content is 0.05% by weight. The steel is tapped into the ladle at 1690°C, the amount of molten steel tapped into the ladle is 125 tons, and the steel slag is about 1 ton, accounting for 15.2% by weight of the total slag produced in the steelmaking process. Add and add 820 kilograms of anthracite, 2900 kilograms of ferrosilicon (silicon content 75%) and 1600 kilograms of silicon manganese ferroalloy (silicon content 18%, manganese content 66%) and 270 kilograms of calcium carbide (of which CaC 2 The content is 75%), the carbon content in the molten steel is 0.59% by weigh...

Embodiment 2

[0039] This example is used to illustrate the preparation method of spring steel according to the present invention.

[0040] (1) 135 tons of molten iron (which contains 3.8% by weight of C and 0.02% by weight of S) is added to a 120-ton converter for blowing. During the blowing process, 8.1 tons of lime and dolomite are added to make slag, and the molten steel at the end of blowing is controlled. The content of carbon is 0.03% by weight. Tapped into the ladle at 1690°C, the amount of molten steel tapped into the ladle was 126 tons, and the steel slag was about 1 ton, accounting for 13.1% by weight of the total slag in the later stage of converter blowing. Add 900 kg of anthracite before tapping, and start adding 450 kg of calcium carbide (wherein CaC 2 content of 75%), the carbon content in the molten steel after tapping is 0.64% by weight, then feed 81 kg of Al wire (the diameter of the aluminum wire is φ 8 mm) at a speed of 10 m / s. At this time, α in molten steel [O] The...

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Abstract

The invention discloses a method for preparing spring steel, comprising the following steps: blowing liquid iron; then tapping liquid steel and part of steel slag into a ladle for refining; degassing the refined liquid steel; and casting plastic molding the degassed liquid steel. The refining method comprises deoxidating and slag conditioning for the liquid steel and the steel slag in the ladle, wherein the deoxidating comprises adding a first deoxidizer before tapping finishing and adding a second deoxidizer in the liquid steel after tapping finishing. The first deoxidizer does not contain Al, and the dosage of the first deoxidizer causes the content of FeO + MnO in the steel slag not to be larger than 2.5 wt %. The second deoxidizer is Al, the dosage of the second deoxidizer causes the content of Als in the liquid steel to be 0.02-0.04wt %, and Als is Alsol. The method can greatly improve the inherent quality of the spring steel, and the fatigue life of prepared spring connections for rail damping can reach 5 million times.

Description

technical field [0001] The invention relates to a method for preparing spring steel. Background technique [0002] Recently, my country is implementing the construction of railway passenger dedicated lines. According to the plan, most of my country's passenger dedicated lines use wheel-rail high-speed railways, and the train speed is more than 250 kilometers per hour. Wheel-rail high-speed railways must use spring connectors (spring connectors for steel rails and steel sleepers, usually called elastic bars or spring fasteners) to reduce vibration, and spring components usually work under very harsh conditions. In the current railway operation Under these conditions, it is required that the fatigue life of spring steel connectors, especially 60Si2MnA spring steel connectors, must reach 5 million times, and the residual degeneration after the fatigue test must be less than 1 mm to meet the needs of railway operations. Therefore, research and development of high-quality spring...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/06
Inventor 刘明李纪仁江南红邓通武陶功明陈小龙徐华东刘昌恒
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD