Technique for prolonging fatigue life of 50CrVA plate spring

A technology of fatigue life and process method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem of low fatigue life of 50CrVA leaf spring, and achieve the effect of improving heat treatment process, eliminating MnS inclusions, and improving deoxidation effect.

Active Publication Date: 2013-04-03
XINJIANG BAYI IRON & STEEL
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to: solve the problem of low fatigue life of 50CrVA leaf springs, make the fatigue life of leaf springs meet the standard requirements of ≥80,000 times in the automobile manufacturing industry, increase output value and create benefits for enterprises

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  • Technique for prolonging fatigue life of 50CrVA plate spring
  • Technique for prolonging fatigue life of 50CrVA plate spring
  • Technique for prolonging fatigue life of 50CrVA plate spring

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Embodiment Construction

[0019] The present invention is further described with reference to examples.

[0020] Operation smelting steps and technical points control of the present invention:

[0021] 1. Optimal design of the chemical composition of its smelted steel

[0022] Prepared by mass percentage, C: 0.50%; Si: 0.25%; Mn: 0.65%; Cr: 0.90%; V: 0.12%; Al: 0.007%; P: 0.018%; S: 0.018%; %; Cu: ≤0.25% composition;

[0023] 2. Control and denaturation treatment of inclusions in smelted steel

[0024] (1) At the joint between the long nozzle of the large ladle and the submerged nozzle of the tundish, an argon sealing ring is used to seal it to prevent secondary oxidation of molten steel in contact with air;

[0025] (2) Tapping with slag is strictly prohibited, and the amount of slag during tapping is controlled at ≤3kg / t;

[0026] (3) Strictly control the weight of molten steel ≥ 7t in the tundish to prevent gas, covering agent and steel slag from being involved in the crystallizer due to the low...

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Abstract

The invention provides a technique for prolonging the fatigue life of a 50CrVA plate spring. The technique includes the optimal design for the following chemical components of a 50CrVA flat spring steel: 0.49 to 0.53% of C, 0.20 to 0.30% of Si, 0.65 to 0.75% of Mn, 0.90 to 1.05% of Cr, 0.11 to 0.15% of V, 0.006 to 0.009% of Al, 0.018 to 0.020% of P, 0.016 to 0.020% of S, not greater than 0.25% of Ni, and not greater than 0.25% of Cu. The method for controlling and denaturating treatment on nonmetallic inclusion in steel comprises the following steps: (1) sealing a connector between a long nozzle of a large steel ladle and an intermediate submersed nozzle through an argon seal ring; controlling the amount of slag in tapping to 0 to 5kg/t; controlling the weight of the molten steel of the steel ladle to be not less than 7t; and controlling the molten steel level of a crystallizer to fluctuate within the scope of +/-2mm; and (2) carrying out denaturating treatment on inclusion; and adding SiCa wires at 2.1m/t through a wire feeder under a white slag condition, wherein the molten steel is at temperature of 1550 to 1580 DEG C; the parameters in heat treatment of the plate spring include quenching temperature of 1000 DEG C, tempering temperature of 500 DEG C, tensile strength of not less than 1300N/mm<2>, yield strength of not less than 1200N/mm<2>, percentage elongation after fracture of not less than 11%, and percentage reduction of area of not less than 50%.

Description

technical field [0001] The invention relates to the chemical composition design of spring flat steel, in particular to a process for improving the fatigue life of leaf springs. The improvement of the fatigue life of the 50CrVA leaf spring has achieved excellent results. Background technique [0002] 50CrVA spring flat steel is a new product developed by Baosteel Group Bayi Iron and Steel Co., Ltd. in recent years. It is produced according to the standard of GB / T 1222-2007 "Spring Steel". It is mainly used to make leaf springs for heavy vehicles; the biggest difficulty in the development and production of this product The fatigue life of the leaf spring is low, which cannot meet the relevant standard requirements of my country's automobile manufacturing industry. The automobile industry requires the fatigue life of the leaf spring to be ≥ 80,000 times, but the fatigue life of the 50CrVA leaf spring produced in the past is only 30,000 to 50,000 times, which cannot meet the req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/24B22D1/00C21D9/02C21D1/18
Inventor 姜英禹
Owner XINJIANG BAYI IRON & STEEL
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