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Continuous on-line preparation method of ultrahigh strength and toughness Mn-B steel structural part

A steel structure, ultra-high-strength technology, applied in the field of steel stamping and forming, can solve the problems of reducing the price of hot-formed parts and popularizing applications, which is not conducive to welding performance, and increasing the cost of raw materials, so as to reduce construction investment costs, fast heating speed, The effect of reducing maintenance costs

Pending Publication Date: 2019-05-17
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And this will undoubtedly increase the cost of raw materials and increase the carbon equivalent of the material, which is not conducive to the subsequent welding performance
[0009] Under the traditional hot stamping forming process, the blank needs to be laser blanked or cold blanked before heating, especially if the cost of laser blanking is high, which is not conducive to reducing the price of hot forming parts and popularizing applications

Method used

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  • Continuous on-line preparation method of ultrahigh strength and toughness Mn-B steel structural part
  • Continuous on-line preparation method of ultrahigh strength and toughness Mn-B steel structural part
  • Continuous on-line preparation method of ultrahigh strength and toughness Mn-B steel structural part

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preparation example Construction

[0063] The continuous on-line preparation method of ultra-high strength and toughness Mn-B steel structure provided by the embodiment of the present invention includes:

[0064] The continuous transmission of the electrode roller is used to carry out cyclic heating-quenching of the Mn-B steel strip, so that the high-temperature austenite and martensite grains after quenching are ultra-fine.

[0065] At the same time, the high-speed heating of the self-resistance heating method is carried out during the continuous transmission of the electrode roller.

[0066] And repeated heating-quenching is carried out to realize the uniform diffusion of elements.

[0067] Ultrafine grained austenite can be transformed into ultrafine grained martensite or ultrafine grained martensite + a small amount of bainite through the high cooling rate in the mold during the hot stamping forming pressure quenching process or the forced cooling method after stamping forming Body tissue, to realize the p...

Embodiment 1

[0090] Such as figure 1 Shown; The continuous on-line preparation method of super high strength and toughness Mn-B steel structure provided by the invention comprises:

[0091] (1) Select a hot-rolled or cold-rolled non-coated plate with the appropriate thickness level required for weight reduction, and select a reasonable initial rectangular blank size according to the number of parts in the forming die under one stroke, but ensure a single blank plate has a maximum length of not less than figure 1 (a) The roller spacing of two pairs of self-resistance heating rollers, otherwise online heating cannot be completed.

[0092] (2) The billet is figure 1 The heating equipment shown in (a) implements continuous on-line cyclic heating and quenching process, in which the rapid heating process is realized by low-voltage and high-current loading between two adjacent pairs of electrode rollers, and then quenching and cooling are implemented when passing through the water-cooled electr...

Embodiment 2

[0097] Such as figure 2 As shown, the continuous on-line preparation method of the ultrahigh-strength toughness Mn-B steel structure provided by the invention comprises:

[0098] (1) Select a hot-rolled or cold-rolled non-coated plate with the appropriate thickness level required for weight reduction, and select a reasonable initial rectangular blank size according to the number of parts in the forming die under one stroke.

[0099] (2) The billet is figure 2 The heating equipment shown in (a) implements continuous on-line cyclic heating and quenching process, in which the rapid heating process relies on the low voltage and high current generated between the electrodes of each pair of vertical rollers to achieve rapid temperature rise along the width direction of the plate, and then implements rapid cooling and quenching. In this way, multiple pairs of electrode rollers are passed continuously to realize multiple cyclic heating-quenching and cooling treatments on the blank ...

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Abstract

The invention belongs to the technical field of steel stamping forming, and discloses a continuous on-line preparation method of an ultrahigh strength and toughness Mn-B steel structural part. An continuous rotating electrode roller is used for circularly heating and quenching an Mn-B steel strip to make high temperature austenite and quenched martensite grain ultrafining; during continuous rotating, the electrode roller is heated at high speed in a self-resistance heating way; homogenization diffusion of elements is realized through multiple times of repeated heating-quenching; and the high cooling speed in a die or a forced cooling method after stamping forming in the hot stamping pressure maintaining quenching process, the ultra-fine grain austenite is converted ultra-fine grain martensite or ultra-fine grain martensite + a bit of bainite and the like organizations, and high-strength toughness structural part preparation is realized. According to the ontinuous on-line preparation method of the ultrahigh strength and toughness Mn-B steel structural part, oxidation can be reduced effectively, thus low cost non-coating board is popularized and used advantageously, homogenization diffusion of the elements with multiple times of repeated heating-quenching is realized within short time, and the performance of component is advantageous uniformity.

Description

technical field [0001] The invention belongs to the technical field of stamping and forming of steel materials, and in particular relates to a continuous on-line preparation method of an ultrahigh-strength toughness Mn-B steel structure. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] The dual requirements of automobile lightweight and safety have prompted an increasing proportion of high-strength and ultra-high-strength steels to be used in body-in-white. Among them, hot stamping has become an increasingly popular forming process in the auto parts manufacturing industry due to its small forming force, high precision of formed parts and high strength of formed components. The tensile strength level of the most commonly used hot-formed ultra-high-strength steel is 1500MPa, and the strength level of some products can even reach 1800MPa. According to incomplete statistics, the mainstream models in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/40C21D1/673C21D1/62C21D8/04
Inventor 姚圣杰
Owner HARBIN INST OF TECH AT WEIHAI
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