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A kind of production technology of piston rod wire rod for automobile

A production process and piston rod technology, which is applied to the production process of piston rod wire rods for automobiles, can solve problems such as insufficient fatigue cycle, and achieve the effect of ensuring surface quality, good dimensional accuracy, and improving decarburization control level.

Active Publication Date: 2017-05-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at defects such as cleavage fracture and insufficient fatigue cycle of the steel used for making shock-absorbing piston rods during cold bending, the purpose of this invention is to provide a production process for piston rod wire rods for automobiles, which can improve the grain size of the material structure and grain distribution (the grain size distributed in the edge and center is above 8.5 grades), reducing the surface decarburization of finished products (decarburization layer depth ≤ 0.1mm), so as to meet the performance indicators of downstream processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A production process for piston rod wire rods for automobiles, through two-fire blanking, low-temperature rolling, low-temperature final rolling, long-term soaking, and rapid cooling to effectively control the uniformity of the grain size of the material and the depth of the decarburization layer, The C content of the piston rod wire rod for automobile is between 0.42% and 0.48%. Table 1 shows a production process control scheme for a wire rod for automobiles in Example 1. Keep the final rolling temperature below 900°C and the coiling temperature at 860°C, while the heating furnace temperature is lowered from the original 1100°C to 980°C, and the steel temperature after phosphorus removal is lowered from the original 1000°C to 905°C. As shown in Table 2, the thickness of the decarburization layer before and after the test is listed. The depth of the decarburization layer after cooling is 80.94 μm, and that before cooling is 203.62 μm.

[0020] Table 1

[0021] ...

Embodiment 2

[0025] As shown in Table 3, it is a production process of piston rod wire rod for automobiles in Example 2. While maintaining the heating temperature in the control process, the final rolling temperature was lowered from the original 980°C to 900°C, and the opening of the water tank was changed from the original If the 4#, 5#, and 6# water tanks are opened at the same time, change the opening degree of the 4# water tank to 1 / 3. Taking the reference water flow rate of 200L / min as a reference, both the 5# and 6# water tanks are closed, and the curling temperature is changed from the original The 820°C increased to 860°C.

[0026] As shown in Table 4, the comparison before and after the test process is listed. According to the control process, no abnormal chilling layer was found, and the grain size of the edge part and the core part remained basically the same, and the distribution was relatively uniform, reaching 8.5 grades.

[0027] table 3

[0028] Process plan Fi...

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PUM

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Abstract

The invention discloses a production process of a piston rod wire rod for a vehicle. The production process comprises the following steps: the temperature of a heating furnace is controlled within 960-1000 DEG C; the temperature of steel before rolling is within 900-920 DEG C; the surface of a finished product is not completely decarburized, and the local decarburization is not more than 0.1 mm; a forced cooling device is externally added to reduce the rolling deformation heat, so that a material is lower in rolling temperature in final rolling, and the influence on the mechanical performance of the material due to excessive growth of grains in final rolling is prevented; finally, the cooling is performed with a flow not more than 200 L / min after rolling; and the soaking time is given after cooling to guarantee the structure uniformity of the material from center to surface as far as possible. Soft 45# steel is used; and a two-fire blooming rolling process is used for controlling the blank component uniformity and the decarburization layer depth to guarantee the surface quality and the size precision of the material and to enable the material to have excellent fatigue life in the cold bend test process. The production process is suitable for manufacturing the material for a vehicle damper piston rod.

Description

technical field [0001] The invention relates to a hot-rolled wire rod for drawing and grinding, in particular to a production process of a piston rod wire rod for automobiles. Background technique [0002] After dephosphorization, drawing, grinding and other processes, it is processed into corresponding steel for rods. Before processing, the surface hardness, cold bending performance, fatigue strength and other indicators of the material should be tested. If the decarburization is heavy, the surface hardness and fatigue performance of the material will drop sharply. At the same time, the grain size of the structure will not be uniform. . Therefore, it is of great practical significance to improve the heating and rolling process of materials, optimize the structure and distribution of materials, and improve the performance of materials. Adopting a normal process will lead to low grain size and uneven distribution of the material (the grain size of the edge and the middle is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06
Inventor 彭学艺陈兆勇杨兆根肖训军
Owner NANJING IRON & STEEL CO LTD