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A kind of anti-seismic fire-resistant steel and preparation method thereof

A fire-resistant, stage-controlled technology, which is applied in the field of steel for building structures, can solve problems such as difficult process control, and achieve the effects of ensuring fire resistance, increasing yield strength, and improving low-temperature impact toughness

Active Publication Date: 2021-09-14
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the critical heat treatment temperature window in the two-phase region is within 10-20 °C, and the process control is extremely difficult

Method used

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  • A kind of anti-seismic fire-resistant steel and preparation method thereof
  • A kind of anti-seismic fire-resistant steel and preparation method thereof
  • A kind of anti-seismic fire-resistant steel and preparation method thereof

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preparation example Construction

[0044] On the other hand, the present invention also provides a kind of preparation method of anti-seismic refractory steel, comprises the following steps:

[0045] Step S1: smelting and casting;

[0046] Step S2: Two-stage controlled rolling of recrystallization and non-recrystallization is carried out by using a plate rolling mill.

[0047] Specifically, step S2 includes the following steps:

[0048] S21. After the continuous casting billet or ingot is opened, put it into the heating furnace and heat it to T1, and hold it for t1 time;

[0049] Specifically, in S21, T1 is 1200-1250°C. This is because when T1 is too high, the austenite grains of the slab are too coarse, and energy costs are increased at the same time. When T1 is too low, elements such as Nb and C are difficult to fully dissolve , affecting subsequent precipitation and microstructure control.

[0050] Specifically, in S21, if the time t1 is too long, the energy cost will be increased, and at the same time, i...

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Abstract

The invention discloses an anti-seismic fire-resistant steel and a preparation method thereof, belonging to the technical field of steel for building structures. The invention solves the problems in the prior art that the preparation process of the anti-seismic refractory steel is complicated and the process control is difficult. The chemical composition of the above-mentioned anti-seismic fire-resistant steel is: C: 0.06% ~ 0.10%, Si: 0.65% ~ 1.00%, Mn: 1.85% ~ 2.50%, Mo: 0.51% ~ 0.60%, Ni: 1.00% ~ 1.50%, Ti: 0.01%-0.03%, Nb: 0.05%-0.10%, V: 0.03%-0.10%, Al: 0.015%-0.055%, P: <0.015%, S: <0.005%, O<0.003 %, N<0.005%, and the rest are Fe and unavoidable impurities. The preparation method is as follows: smelting and casting; performing two-stage controlled rolling. The above preparation method is simple and easy to control, and the prepared anti-seismic fire-resistant steel has good comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of steel for building structures, and in particular relates to an anti-seismic fire-resistant steel and a preparation method thereof. Background technique [0002] It is technically difficult to meet the yield strength ≥ 690 MPa, yield ratio ≤ 0.85, and elongation after fracture ≥ 18% for ultra-high-strength building structure steel. The existing technology usually adopts hot rolling direct quenching + two-phase zone critical heat treatment. Process method, hot rolling and direct quenching to obtain martensite-based structure, heat treatment at high temperature to obtain high-temperature tempered martensite enhanced by the pre-precipitation of nanometer second phase and a certain amount of reverse transformed austenite, reverse transformation during cooling Transform a part of austenite to form high hardness bainite / martensite, high temperature tempered secondary martensite + high hardness primary bainite / ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/08C22C38/14C22C38/06C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/001C21D2211/002C21D2211/004C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 李昭东王鑫曹燕光杨忠民陈颖王慧敏沈俊昶
Owner CENT IRON & STEEL RES INST
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