Spring steel and surface decarbonization control process thereof

A technology of spring steel and process, which is applied in the field of spring steel and its surface decarburization process, can solve the problems that the surface decarburization layer of spring steel cannot reach the uniformity of steel structure, complex production process, poor performance stability, etc., and achieve superior performance , Simple production process and stable performance

Active Publication Date: 2017-10-27
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is aimed at the complex production process, high alloy cost and low production efficiency of the current production method for producing spring steel, and the decarburization layer on the surface of the spring steel produced cannot meet the user's requirements (conforming to the standard and not applicable) and the steel structure is uniform In order to solve the problems of poor stability and performance stability, a high-strength and toughness spring steel and

Method used

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  • Spring steel and surface decarbonization control process thereof
  • Spring steel and surface decarbonization control process thereof
  • Spring steel and surface decarbonization control process thereof

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Embodiment 1～10

[0037] The preparation method (surface decarburization control process) of spring rigid described in embodiment 1~10 comprises the following steps:

[0038] 1) Desulfurization of molten iron: the magnesium powder desulfurization process is adopted to control the sulfur content of molten iron leaving the station [S]≤0.005wt%;

[0039] 2) Converter oxygen blowing smelting: 120 tons of converter oxygen blowing smelting is adopted to ensure that the carbon temperature is coordinated when tapping, and silicon-manganese alloy, ferrosilicon, high-carbon ferrochrome, ferro-niobium and carbon powder are added when tapping 1 / 3 of the steel, and molten steel Alloy and recarburizer (carbon powder) must be completely added when the output reaches 2 / 3;

[0040] 3) Argon blowing: the obtained ladle molten steel is blown with argon at the argon station, and the blowing time is not less than 3 minutes;

[0041] 4) Refining outside the furnace: refining in the LF furnace, adding active lime an...

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Abstract

The invention discloses spring steel which is prepared from the following components in percentage by weight: 0.56-0.64% of C, 1.5-2.0% of Si, 0.70-1.00% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.10-0.35% of Cr, 0.01-0.04% of Nb and the balance of Fe and impurity elements. High-end spring steel which is uniform in structure, stable in performance, high in strength, good in plasticity, and especially has excellent controlled performance of a surface decarburized layer can be developed by adopting a niobium micro-alloying method and integrating a proper clean steel smelting process, a continuously-cast blank surface defect control technology, a heating furnace fuel and in-furnace atmosphere optimization technology, and the problems such as a complex production process, high alloy cost and low production efficiency in an existing spring steel preparation method are effectively solved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical production, and in particular relates to a spring steel and a surface decarburization process thereof. Background technique [0002] Springs are very important mechanical parts, widely used in automobiles, railways, aviation, navigation, national defense and other fields. Due to the particularity of the service environment, the spring steel is required to have a high elastic limit, excellent elastic loss resistance and a high yield ratio. In order to prevent the fatigue fracture of the material under high-frequency alternating stress, the spring is required to have a relatively high High fatigue strength and sufficient ductility. 60Si2Mn is one of the most widely used spring steel varieties in China, and its consumption accounts for 50-60% of the total spring steel. Under the current industrial production conditions, for most spring steels, the problem of surface decarburization is in...

Claims

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Application Information

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IPC IPC(8): C22C38/34C22C38/04C22C38/26C22C33/06C21D8/00C21D1/76
CPCC21D1/76C21D8/005C21D2211/001C22C33/06C22C38/04C22C38/26C22C38/34
Inventor 丁礼权任安超张贤忠张帆叶途明丁文胜董水要
Owner 武汉钢铁有限公司
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