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Steel strip of cold-rolled finishing fine blanking material for automobile child seat locking device

A child seat and locking device technology, which is applied in the field of steel strips of cold-rolled finishing and fine-blanking materials, and can solve problems such as parts cracking

Inactive Publication Date: 2020-11-20
SUZHOU XIANGLOU METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inevitably subject to hydrogen embrittlement, which leads to cracking during part testing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0048] Specific implementation method: a steel strip of cold-rolled finishing and fine-blanking material for a car child seat locking device, the composition mass percentage of the cold-rolled 51CrV4 steel strip is: carbon: 0.50-0.55%; silicon 0.15-0.35% ; Manganese 0.80-1.10%; Phosphorus ≤ 0.015%; Sulfur ≤ 0.01%; Chromium 0.90-1.20%; Vanadium 0.10-0.20%;

[0049] The performance parameters of cold-rolled 51CrV4 steel strip are: tensile strength 510-560Mpa, yield strength 350-420Mpa, elongation > 12%;

[0050] Described cold rolling and strip annealing process, concrete process is as follows:

[0051] Step 1: Take hot-rolled steel coil 4.5 × 1250mm: carry out stripping, then carry out pickling and soaking, and clean and remove the surface oxide layer with an ultrasonic cleaning machine;

[0052] Step 2: The specification of the strip is 4.5×234mm, and the strip is annealed;

[0053] The annealing process of described step 2 is as follows:

[0054] 1) Heat to 300°C for heat ...

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Abstract

The invention discloses a steel strip of a cold-rolled finishing fine blanking material for an automobile child seat locking device. The cold-rolled 51CrV4 steel strip comprises the following components of, in percentage by mass, 0.50%-0.55% of carbon, 0.15%-0.35% of silicon, 0.80%-1.10% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.01% of sulfur, 0.90%-1.20% ofchromium, 0.10%-0.20% of vanadium, and less than or equal to 0.035% of aluminum; the cold-rolled 51CrV4 steel strip comprises the performance parameters that the tensile strength is 510-560 Mpa, theyield strength is 350-420 Mpa, and the elongation is greater than 12%; meanwhile, isothermal bainite quenching is adopted, the strength of a part can be improved to HRC47-55 from HRC42-46, the hydrogen embrittlement resistance time is prolonged to 10 hours from 10 minutes, and the force attenuation after electroplating is less than 2%. The 51CrV4 structure obtained by the adjusted chemical components and the cold rolling annealing process is changed from the original hot-rolled flaky pearlite into the fine dispersively distributed granular pearlite, the performance is stable and uniform, meanwhile, the isothermal bainite quenching is adopted, the strength of the part can be improved to HRC47-55 from HRC42-46, and the hydrogen embrittlement resistance time is prolonged to 10 hours from 10 minutes, and the force attenuation after the electroplating is less than 2%.

Description

technical field [0001] The invention relates to the field of development of new materials for automobiles, in particular to a steel strip of cold-rolled finishing and fine-blanking materials used for locking devices of automobile child seats. Background technique [0002] A safety seat is a seat specially designed for children of different weights (or age groups), installed in a car, and can effectively improve the safety of children in a car. In the event of a car collision or sudden deceleration, it can reduce the impact on children and limit their body movement so as to reduce their injuries. The China Business Industry Research Institute predicts that the output of child safety seats in China will reach 16.08 million in 2017. Child car safety seat spare parts mainly include: seat body, locking device, seat belt buckle, webbing, ISOFIX interface. Among them, the manufacturing level of the seat body is an important embodiment of the manufacturing level of the child safet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/06C21D8/02C21D1/32C21D1/773C21D1/20
CPCC21D1/20C21D1/32C21D1/773C21D8/0236C21D8/0268C21D8/0273C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/24
Inventor 李佩张骁吴文斌储钱良杨春启
Owner SUZHOU XIANGLOU METAL PROD