Steel for front axle of medium-sized truck and production method of steel

A technology for medium-sized trucks and front axles, which is applied in the steel for medium-sized trucks' front axles and its production field. It can solve the problems that the steel quality is difficult to meet the fatigue life of the front axle of automobiles, achieve uniform and stable composition and structure, improve pouring performance, and steel properties. excellent effect

Active Publication Date: 2021-08-03
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the front axles used by domestic medium-sized trucks are basically 45 carbon steel and 40Cr alloy steel, and the quality of the steel is difficult to meet the standard requirements for the fatigue life of the front axle of automobiles to meet 800,000 times

Method used

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  • Steel for front axle of medium-sized truck and production method of steel
  • Steel for front axle of medium-sized truck and production method of steel
  • Steel for front axle of medium-sized truck and production method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A 120-ton electric furnace is used for primary smelting, using high-quality self-circulating scrap steel, adding 84.9 tons of molten iron, accounting for 69.19%, adding 26kg of copper with the scrap steel, smelting in the electric furnace for 55 minutes, power supply for 10 minutes, the end carbon 0.12%, the end phosphorus 0.009%, and tapping The temperature is 1638°C. 115 tons of steel are tapped from the electric furnace, 500kg of lime is added during the tapping process, 400kg of refined pre-slag is added, and alloys are added into the production line according to the composition. After the molten steel reaches the refining station, a total of 470kg of lime and 290kg of pre-smelting slag are added during the power transmission process, and calcium carbide, carburizer and silicon carbide are used for diffusion deoxidation, and 50kg of silicon carbide is used. After the diffusion deoxidation is completed, the alloy is allocated according to the target composition. The ...

Embodiment 2

[0042] Use a 120-ton electric furnace for smelting, add 40.7 tons of scrap steel, add 25kg of copper with the scrap steel, add 79.7 tons of molten iron, the ratio of molten iron is 66.42%, smelt in the electric furnace for 65 minutes, send electricity for 13 minutes, end-point carbon 0.12%, end-point phosphorus 0.009%, tapping temperature 1641 ℃, the steel output of the electric furnace is 117.5 tons. During the tapping process, 900kg of lime is added along with the steel flow, 250kg of refined pre-slag is added, and the alloy is mixed according to the lower limit of the composition. After the molten steel reaches the refining station, power is sent. According to the fluidity of the slag, 200kg of lime is supplemented, 450kg of refined pre-slag is used, and carburizers and silicon carbide are used for diffusion deoxidation, and silicon carbide is used for 55kg. into the alloy, the total refining cycle is 55min. After the molten steel is refined, carry out vacuum degassing, va...

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Abstract

The invention discloses steel for a front axle of a medium-sized truck and a production method of the steel. The steel comprises the following chemical components including, by weight, 0.39% to 0.43% of C, 0.20% to 0.37% of Si, 0.65% to 0.80% of Mn, 0.95% to 1.10% of Cr, 0.01% to 0.05% of Mo, 0.02% to 0.03% of Ni, 0.02% to 0.05% of Cu, less than or equal to 0.020% of P, 0.010% to 0.025% of S, 0.010% to 0.040% of Alt and the balance Fe and other inevitable impurities, so that the contents of Mo, Ni and Cu in the steel meet the condition that the sum of Mo, Ni and Cu is more than or equal to the sum of 0.013C, 0.033Mn and 0.034Cr and less than or equal to the sum of 0.018C, 0.026Mn and 0.065 Cr. According to the steel for the front axle of the medium-sized truck and the production method of the steel, the contents of Mo, Ni, Cu and other elements in the steel are accurately controlled, steel grains are refined, the impact toughness of the steel is improved, and the fatigue life of the automobile front axle is prolonged.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, in particular, the invention relates to a steel for the front axle of a medium-sized truck and a production method thereof. Background technique [0002] The automobile axle is a safety part of the automobile, and its function is to support the weight of the vehicle, the steering mechanism and the suspension bracket. The shape of the front axle is complex, and it bears impact loads. Especially when the car brakes suddenly downhill, the front axle will bear 2 / 3 of the car load, and its strength, stiffness and fatigue life will directly affect the stability of the car transmission system and the vehicle. security. When connecting the suspension and the frame, it transmits various loads between the wheels and the frame, including vertical force, longitudinal force, and lateral force, as well as the torque generated between them, and the loads it bears are mostly alternating loads. Its quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C33/06B21B1/26
CPCC22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C33/06C22C38/50B21B1/26
Inventor 刘兵刘运丽刘鹏赵冠夫戈文英梁娜况兴宇王升
Owner SHANDONG IRON & STEEL CO LTD
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