Special steel STDB1570 for bumper bar of side door of passenger vehicle and manufacturing method of special steel

A manufacturing method and anti-collision bar technology, applied in the direction of temperature control, etc., can solve problems such as unstable hardness and poor surface quality, and achieve the effect of ensuring the stability of belt threading, the quality stability of finished products, and the optimization of rolling load

Inactive Publication Date: 2021-02-26
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of raw materials in the prior art such as performance after quenching, unstable hardness, and poor surface quality, the present invention provides a special steel STDB1570 for passenger car side door anti-collision bars and its manufacturing method, which realizes hot rolling based on the existing 2150mm production line The product has good surface quality, high dimensional accuracy, and good performance consistency. After high-frequency induction heat treatment, the performance is stable and the surface hardness is uniform, which meets the steel requirements for side door anti-collision bars of passenger cars.

Method used

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  • Special steel STDB1570 for bumper bar of side door of passenger vehicle and manufacturing method of special steel
  • Special steel STDB1570 for bumper bar of side door of passenger vehicle and manufacturing method of special steel
  • Special steel STDB1570 for bumper bar of side door of passenger vehicle and manufacturing method of special steel

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Effect test

Embodiment 1

[0046] The special steel STDB1570 for the side door anti-collision bar of the passenger car described in this embodiment contains the following components and weight percentages: C 0.24%, Si 0.25%, Mn 1.32%, P 0.014%, S 0.001%, Cr 0.20%, B 0.003%, N0.0034%, Ti 0.032%; the rest are Fe and unavoidable impurities. The composition design is shown in Table 1.

[0047] The manufacturing method of the special steel STDB1570 comprises steelmaking process, continuous casting and 2150mm steel rolling production (relevant parameters are shown in Table 2), specifically:

[0048] (1) Steelmaking process:

[0049] ①Using lime and granular magnesium pre-composite desulfurization, the S content of the outbound station is ≯0.001%, and the temperature of the molten iron is 1354°C;

[0050] ②Converter end point temperature 1661℃, P≯0.010%;

[0051] ③ Refining exit temperature is 1565°C, white slag is produced, alloy is fine-tuned, B and Ti are adjusted before soft blowing, micro-positive pres...

Embodiment 2

[0061] The special steel STDB1570 for the side door anti-collision bar of the passenger car described in this embodiment contains the following components and weight percentages: C 0.23%, Si 0.25%, Mn 1.27%, P 0.014%, S 0.001%, Cr 0.20%, B 0.003%, N0.0030%, Ti 0.030%, and the rest are Fe and unavoidable impurities. The composition design is shown in Table 1.

[0062] The manufacturing method of the special steel STDB1570 includes steelmaking process, continuous casting and 2150mm steel rolling production, specifically:

[0063] (1) Steelmaking process:

[0064] ① Deep desulfurization of molten iron, requiring S content ≯0.001% at the exit of the station, and molten iron temperature 1321°C;

[0065] ②Converter end point temperature 1673℃, P≯0.010%;

[0066] ③ Refining exit temperature is 1563℃, white slag is produced, alloy is fine-tuned, B and Ti are adjusted before soft blowing, micro-positive pressure operation is carried out throughout the refining process, the effect of ...

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Abstract

The invention relates to the technical field of ultrahigh-strength hot rolled steel production, in particular to special steel STDB1570 for a bumper bar of a side door of a passenger vehicle and a manufacturing method of the special steel. The STDB1570 comprises the components including, by weight percentage, 0.20%-0.25% of C, 0.20%-0.30% of Si, 1.20%-1.40% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.15%-0.25% of Cr, 0.002%-0.005% of B, less than or equal to 0.006% of N, 0.030%-0.045% of Ti, and the balance Fe and inevitable impurities. The method comprises asteelmaking process, a continuous casting process and a steel rolling process. By means of reasonable component design, low C, medium Mn, a certain amount of Cr and Ti, and a small amount of B are added for content control, a continuous casting soft pressure and electromagnetic stirring technology and a rolling temperature control technology are used in cooperation, a rolling line heat preservation cover is put into use, and thus thermal forming of production of the special steel STDB1570 for the bumper bar of the side door is achieved. The bending property, the yield strength, the tensile strength, the elongation, the surface hardness and the like of the product after heat treatment meet the requirements of the steel for the bumper bar of the passenger vehicle.

Description

technical field [0001] The invention relates to the technical field of ultra-high-strength hot-rolled steel production, in particular to a special steel STDB1570 for side door anti-collision bars of passenger cars and a manufacturing method thereof. Background technique [0002] The demand for automobiles is increasing rapidly, and the problem of automobile safety is becoming more and more prominent. Every year, side collision accidents account for 30% of the total number of traffic accidents, and the death rate caused by side collisions is as high as 37.4%. Analysis In side collisions, there are few energy-absorbing components in side collisions, and there is only a 20-30mm space between the inner panel of the door and the members. When the side door is hit violently, the side door collapses into the car due to insufficient rigidity, and the occupants receive a strong impact. , seriously endangering life. Relevant surveys show that there is a linear relationship between th...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/32C22C38/28B22D11/16B22D11/115B21B37/74C21D8/02
CPCB21B37/74B22D11/115B22D11/16C21D8/0205C21D8/0226C21D8/0247C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/28C22C38/32
Inventor 郝兰桥薛洪涛陈宇戴德胜陈传敬姚兴涛王超张瑞贺张志坚刘启森秦哲朱经涛王栋王立涛张向厅吕士迎马锦峰
Owner RIZHAO STEEL HLDG GROUP
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