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Medium carbon steel material for automobile safety belt pull rod and preparation process of medium carbon steel material

A preparation process and seat belt technology, which is applied in the field of medium-carbon steel materials for automobile seat belt pull rods and its preparation process, can solve the problems of low impact force, low hardness, and unsatisfactory comprehensive performance, and achieve strong impact resistance and high hardness. The effect of high and good market prospects

Inactive Publication Date: 2018-07-06
DONGGUAN KELEE STEEL WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of unsatisfactory comprehensive performance, low hardness and low impact force of the existing steel used for seat belt pull rods of automobiles, the invention provides a preparation process of medium carbon steel materials for pull rods of automobile seat belts

Method used

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  • Medium carbon steel material for automobile safety belt pull rod and preparation process of medium carbon steel material
  • Medium carbon steel material for automobile safety belt pull rod and preparation process of medium carbon steel material

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Embodiment 1

[0052] This embodiment provides a preparation process for a medium-carbon steel material for an automobile safety belt pull rod, and the preparation process includes the following steps:

[0053] Step 1, material selection: select the domestically produced SWRCH35K material as the base material, and carry out incoming inspection to it: the total mass of the base material is 100%, the S content is 0.02%, and the P content is 0.025%; the internal organization is Ferrite and pearlite, and uniform distribution, no abnormal structure, grain size is 8 grades; original size accuracy requirement is tolerance ± 0.1mm; tensile strength is 620MPa.

[0054] Step 2, initial drawing: take the principle of combining a large total compression rate and a small partial compression rate, the total compression rate is 70%, and the partial compression rate is 5%;

[0055] Step 3. Spheroidizing annealing: first raise the temperature to 740°C, keep it warm for 5 hours, then cool it to 695°C at 10°C / ...

Embodiment 2

[0058] This embodiment provides a preparation process for a medium-carbon steel material for an automobile safety belt pull rod, and the preparation process includes the following steps:

[0059] Step 1, material selection: select the domestically produced SWRCH35K material as the base material, and carry out incoming inspection to it: the total mass of the base material is 100%, the S content is 0.025%, and the P content is 0.018%; the internal organization is Ferrite and pearlite, and evenly distributed, no abnormal structure, the grain size is 9 grades; the original size accuracy requirement is tolerance ± 0.2mm; the tensile strength is 600MPa.

[0060] Step 2, initial drawing: adopt the principle of combining a large total compression rate and a small partial compression rate, the total compression rate is 80%, and the partial compression rate is 15%;

[0061] Step 3. Spheroidizing annealing: first raise the temperature to 750°C, keep it warm for 5 hours, then cool it to 6...

Embodiment 3

[0064] This embodiment provides a preparation process for a medium-carbon steel material for an automobile safety belt pull rod, and the preparation process includes the following steps:

[0065] Step 1, material selection: select the domestically produced SWRCH35K material as the base material, and carry out incoming inspection to it: the total mass of the base material is 100%, the S content is 0.022%, and the P content is 0.015%; the internal organization is Ferrite and pearlite, and evenly distributed, no abnormal structure, grain size is 8; the original size accuracy requirement is tolerance ± 0.12mm; tensile strength is 605MPa.

[0066] Step 2, initial drawing: take the principle of combining a large total compression rate and a small partial compression rate, the total compression rate is 75%, and the partial compression rate is 12%;

[0067] Step 3. Spheroidizing annealing: first raise the temperature to 745°C, keep it warm for 4 hours, then cool it to 690°C at 10°C / ho...

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Abstract

The invention relates to the technical field of automobile safety belt pull rods, in particular to a medium carbon steel material for an automobile safety belt pull rod and a preparation process of the medium carbon steel material. The preparation process at least comprises the following steps that a SWRCH35K material is selected as a base material; primary drawing is carried out, wherein the total compression rate is 60-80%, the partial compression rate is 5-15%; spheroidizing annealing is carried out, namely the temperature is heated to 20-30 DEG C above the austenite transformation temperature, the temperature is kept for 5-6 hours, then the temperature is cooled to 20-30 DEG C below the the austenite transformation temperature at the standard of 8-10 DEG C per hour, the temperature iskept for 3-4 hours, and then cooling is carried out along with a furnace until the base material can be discharged from the furnace; and precision drawing is carried out, namely single-pass drawing iscarried out, and the compression rate is controlled to be 10-15%. The medium carbon steel material prepared by the preparation method has relatively high impact resistance, the hardness HRB is 85-95,and the tensile strength is 650-800 MPa, so that the medium carbon steel material is applicable to follow-up product processing and forming while being ensured not to deform when certain tensile force is applied.

Description

technical field [0001] The invention relates to the technical field of automobile safety belt pull rods, in particular to a medium carbon steel material for automobile safety belt pull rods and a preparation process thereof. Background technique [0002] Swedish Volvo Car Company engineer Nils Bolin (Nils Bolin) invented the car three-point seat belt in 1959, and Volvo company also provided seat belts as standard on all its models in 1963, which marked the car seat belt as a This standard configuration is widely used in automobiles. [0003] In 1992, the Ministry of Public Security of my country promulgated a circular on November 15, 1992, stipulating that from July 1, 1993, all passenger vehicles (including cars, jeeps, vans, and mini-cars) drivers and front seat passengers Seat belts must be used. [0004] After more than 40 years of development, car seat belts have gradually matured. The current seat belts are all made of extremely strong synthetic fibers, with retracto...

Claims

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Application Information

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IPC IPC(8): B21C1/02C21D1/32C21D6/00
CPCB21C1/02C21D1/32C21D6/00
Inventor 郝小龙肖杰罗安武刘晓祥
Owner DONGGUAN KELEE STEEL WIRE
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