Steel for automobile b-pillar reinforcement plate and preparation method thereof

A technology for reinforcing plates and B-pillars, applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of high manufacturing costs of parts and large investment in production lines, and achieve the effects of low cost, stable production process, and low cost

Active Publication Date: 2019-08-06
江苏育材堂车身技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent document CN 207345931U discloses a thermoformed automobile B-pillar reinforcement plate with variable material thickness. The material is 22MnB5. The advantage is that the formability of thermoformed steel is good. The disadvantage is that the manufacturing cost of the parts is too high and the investment in the production line is large.

Method used

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  • Steel for automobile b-pillar reinforcement plate and preparation method thereof
  • Steel for automobile b-pillar reinforcement plate and preparation method thereof
  • Steel for automobile b-pillar reinforcement plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0062] A method for preparing steel for an automobile B-pillar reinforcement plate, comprising the following steps:

[0063] Step 1, vacuum furnace smelting:

[0064] According to the chemical composition of the steel for the automobile B-pillar reinforcement plate, weigh the raw materials, smelt them in a 200kg vacuum furnace to obtain ingots, the chemical composition of the steel for the automobile B-pillar reinforcement plate is shown in Table 1, and the balance is Fe and unavoidable impurities;

[0065] Step 2: Ingot Heating

[0066] Heating the ingot to obtain a heated ingot; wherein, the heating temperature is 1200°C, and the holding time is 120-150min;

[0067] Step 3, Rough Rolling

[0068] The heated ingot is subjected to 7 passes of rough rolling. The starting temperature of rough rolling and the total reduction ratio of rough rolling are shown in Table 2 to obtain a rough rolling intermediate billet with a thickness of 29.5-34.5mm;

[0069] Step 4, finishing rol...

Embodiment 2

[0085] The metallographic structure of the steel for the automobile B-pillar reinforcement plate that embodiment 2 obtains is as follows: figure 1 Shown, the metallographic structure of the steel for the automobile B-pillar reinforcing plate that embodiment 3 obtains is as follows figure 2 It can be seen from the figure that the prepared steel for automobile B-pillar reinforcement mainly contains ferrite, bainite and retained austenite. It needs to be further explained that: the ferrite structure includes two forms of α-ferrite and δ-ferrite, which endow the steel with excellent strength and elongation properties; the forms of retained austenite mainly include massive residual austenite and thin film The massive retained austenite is prone to phase transformation during the stretching process, which endows the steel with excellent elongation properties, while the film-like retained austenite can hinder the propagation of cracks, which can greatly improve the strength and plas...

Embodiment 1

[0086] The stress-strain curve of the steel for the automobile B-pillar reinforcement plate that embodiment 1 obtains is shown in image 3 ,From image 3 Among them, the yield strength of the steel for the B-pillar reinforcement plate of Example 1 is 522MPa, the tensile strength is 806MPa, the elongation is 42%, and the strength-plastic product is 33.852GPa·%.

[0087] It can be seen from the above examples that the tensile strength of the steel for B-pillar reinforcement plates of automobiles prepared by adopting the composition design, rolling and continuous annealing process of the present invention is 800-850 MPa, the elongation is 38-44%, and the strong-plastic product is 30-35 GPa. %, meeting the requirements of high strength, high plasticity and low cost of the B-pillar reinforcement plate.

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Abstract

The invention discloses steel for an automobile B-pillar reinforcing plate and a preparation method thereof, and belongs to the field of manufacturing of materials for automobile body parts. The steelfor the automobile B-pillar reinforcing plate is prepared from the following chemical components in percentage by mass: 0.35-0.55% of C, 0.17-0.22% of Si, 0.8-1.5% of Mn, less than or equal to 0.02%of P, less than or equal to 0.02% of S, 2.5-4.69% of Al and the balance of Fe and unavoidable impurities. With tensile strength of 800-850 MPa, elongation of 38-44% and strength-elongation product of30-35 GPa.%, the steel for the automobile B-pillar reinforcing plate meets the requirements on the steel for a high-strength, high-plasticity and low-cost cold-forming automobile B-pillar reinforcingplate. The method comprises the following steps: vacuum furnace smelting, casting blank heating, rough rolling, finish rolling, pickling and cold rolling and continuous annealing. The preparation technology is simple and takes short time and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the field of material manufacturing for automobile body parts, and in particular relates to a steel for a B-pillar reinforcement plate of an automobile and a preparation method thereof. The steel for a B-pillar reinforcement plate of an automobile is particularly suitable for manufacturing a B-pillar reinforcement plate of an automobile and meets safety requirements for vehicle body collisions . Background technique [0002] In recent years, as people have higher and higher requirements for automobile collision safety, the weight and size of barriers in side collision tests have stricter requirements in the development of the industry, which has brought great pressure to automobile manufacturers and material suppliers. new challenges. [0003] The B-pillar reinforcement plate of the automobile is the main structural part of the passenger compartment of the automobile. It mainly plays the role of resisting the collision load in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C21D8/04C21D9/00
CPCC21D8/0226C21D8/0436C21D9/0081C22C38/02C22C38/04C22C38/06
Inventor 易红亮徐鑫王国栋许宝玉
Owner 江苏育材堂车身技术有限公司
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