Ultrahigh strength TRIP steel with pressure intensity being 1.5GPa or higher and preparation method thereof

An ultra-high-strength, ultra-cryogenic technology, which is applied in the field of ultra-high-strength TRIP steel and its preparation, can solve the problems of wasting energy, low tensile strength, and increasing production costs, so as to reduce costs and manufacturing difficulties, reduce casting difficulties, The effect of increasing the difficulty of casting

Active Publication Date: 2017-12-12
NORTHEASTERN UNIV
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Problems solved by technology

[0007] Chinese invention patent application publication specification CN102912219A The invention discloses a high-strength plastic product TRIP steel plate, C: 0.08%-0.5%, Si: 0.4%-2.0%, Mn: 3%-8%, P: ≤0.10%, S: ≤0.02%, Al: 0.02%~4%, N: ≤0.01%, Nb: 0~0.5%, V: 0~0.5%, Ti: 0~0.5%, Cr: 0~2%, Mo: 0~ 1%, and the rest is composed of Fe and unavoidable impurities; the process annealing takes a long time, increases production

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  • Ultrahigh strength TRIP steel with pressure intensity being 1.5GPa or higher and preparation method thereof
  • Ultrahigh strength TRIP steel with pressure intensity being 1.5GPa or higher and preparation method thereof
  • Ultrahigh strength TRIP steel with pressure intensity being 1.5GPa or higher and preparation method thereof

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preparation example Construction

[0044] As a preferred embodiment, the chemical composition and content of an ultra-high-strength TRIP steel are: C is 0.1-0.25wt.%, Mn is 5-10wt.%, Si is 1-3wt.%, and P is ≤ 0.2wt.%, S is ≤0.005wt.%, and the balance is Fe and unavoidable impurities; the preparation method of the ultra-high-strength TRIP steel comprises the following steps:

[0045] (1) Melting: Melting and casting at a temperature of 1500-1700°C;

[0046] (2) Forging: Heat the ingot to 1150-1250°C, keep it warm for 1-2 hours, forge it into a long strip, and perform normalizing treatment (normalizing treatment to eliminate the internal stress generated by forging);

[0047] (3) Hot rolling: Cut the strip-shaped forging into a square ingot (80mm×80mm×40mm), heat it to 1100-1200°C, keep it warm for 2-3 hours, and perform multi-pass hot rolling (the total deformation is about 75-40mm). 95%), quenched, made into steel plate

[0048] Among them, the hot rolling adopts a two-roll hot rolling mill, and the deformati...

Embodiment 1

[0053] The chemical composition and content of the ultra-high-strength TRIP steel plate in this embodiment are: C is 0.21wt.%, Mn is 8.95wt.%, Si is 2.81%, P is ≤0.2wt.%, and S is ≤0.005wt.%. , the balance being Fe and unavoidable impurities.

[0054] The production method of the ultra-high-strength TRIP steel plate of the present embodiment is as follows:

[0055] (1) Melting: chemical composition and ingredients, melting at 1650°C, casting;

[0056] (2) Forging: heat the ingot to 1200°C, keep it warm for 2 hours, forge it into a long strip, and perform normalizing treatment;

[0057] (3) Rolling: Cut the strip-shaped forging into a square ingot (80mm×80mm×40mm), heat it to 1250°C, keep it warm for 2h, and perform 8 passes of hot rolling (the total deformation is about 92%), and start rolling The temperature is 1200°C, the final rolling temperature is 900°C, post-quenching, the quenching adopts TMCP process, and the cooling rate is 60°C / s to make a 3.0mm thick hot-rolled st...

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Abstract

The invention discloses ultrahigh strength TRIP steel with the pressure intensity being 1.5GPa or higher and a preparation method thereof, and belongs to the technical field of hot-rolled steel plates with the high product of strength and ductility. The ultrahigh strength TRIP steel comprises the chemical components of 0.1-0.25wt.% of C, 5-10% wt.% of Mn, 1-3wt.% of Si, 0-0.2wt.% of P, 0-0.005wt.% of S, and the balance Fe and inevitable impurities. The preparation method comprises the steps of smelting, casting, forging, rolling and annealing; in the rolling process, quenching is conducted after multiple passes of hot rolling; the rolling starting temperature is 1100-1250 DEG C; the finish rolling temperature is 850-950 DEG C; a TMCP technology is applied to quenching; and in the annealing process, the temperature is increased to 600-750 DEG C in the two-phase region, heat preservation is carried out for 2-5 h, and air cooling is conducted till the temperature is equal to the room temperature. A prepared ultrahigh strength TRIP steel plate has the ultrahigh strength mechanical property characteristic, the tensile strength is higher than or equal to 1500MPa, the yield strength is higher than or equal to 800MPa, the percentage elongation is larger than or equal to 20%, and the product of strength and ductility is higher than or equal to 30GPa.%.

Description

technical field [0001] In particular, the invention belongs to the technical field of ultra-high-strength and high-plasticity steel, and in particular relates to an ultra-high-strength TRIP steel above 1.5 GPa level and a preparation method thereof. Background technique [0002] For automobile manufacturing, among many measures to reduce fuel consumption, energy saving and emission reduction, reducing body weight and improving safety are the most important development directions. Studies have shown that every 10% reduction in body weight can save fuel by 3% to 7%. Therefore, the application of automobile lightweight technology has become one of the key technologies for major automobile manufacturers to improve their competitiveness. In order to achieve the goals of energy saving, emission reduction and safety improvement, the concept of advanced high strength steel (AHSS) came into being. After years of research and development, advanced high strength steel has developed to...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C21D1/18C21D8/02C21D6/04C21D1/26
CPCC21D1/18C21D1/26C21D6/04C21D8/0226C21D2211/001C21D2211/005C22C38/02C22C38/04
Inventor 邸洪双闫宁邓永刚李洋黄慧强李云龙
Owner NORTHEASTERN UNIV
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