345 MPa level anti-seismic fire-resistant and weather-resistant steel and preparing method thereof

A fire-resistant and weather-resistant, Q345B technology, applied in the field of steel rolling, can solve the problems of increasing the difficulty of construction and maintenance, increasing the anti-corrosion measures, increasing the thickness of the steel, etc., so as to reduce the construction cost and maintenance cost, reduce the construction process, and improve the earthquake resistance. performance effect

Active Publication Date: 2016-06-01
WUKUN STEEL
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the fire resistance and anti-corrosion ability of ordinary steel structure buildings are poorer than those of concrete buildings. The fire resistance limit time of ordinary steel is short, and the yield strength will decrease a lot with the increase of its own temperature, and even completely lose its bearing capacity when it reaches above 600 °C
In addition, corrosion is also one of the main reasons for the failure of ordinary steel structure buildings. In order to consider the impact of corrosion failure, it is necessary to increase the thickness of steel and anti-corrosion measures in the design of ordinary steel structure buildings, increasing the difficulty of construction and maintenance, etc.
In order to ensure the earthquake resistance, fire resistance and corrosion resistance of steel structure buildings, in recent years, research and application of related earthquake-resistant steel, fire-resistant steel, and weather-resistant steel have been actively carried out at home and abroad. Research is still rarely reported, and most of the production costs are high and difficult to produce, which limits the promotion and application

Method used

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preparation example Construction

[0022] The preparation method of the 345MPa grade earthquake-resistant, refractory and weather-resistant steel of the present invention includes heating, dephosphorization, high-temperature rough rolling, high-temperature finish rolling, cooling and medium-temperature coiling processes, specifically including:

[0023] The heating process refers to: sending the steel billet whose chemical composition meets the requirements into the heating furnace, heating it to 1250~1300°C and releasing it for use; the chemical composition meeting the requirements means that the chemical composition of the steel billet is calculated by weight percentage: C: 0.04% ~0.12%, Si: 0.20%~0.40%, Mn: 0.7%~1.6%, P: 0.015%~0.040%, Cu: 0.25%~0.34%, Mo: 0.35%~0.50%, Ti: 0.025%~0.045 %, S≤0.015%, Als: 0.015%~0.050%, N≤0.004%; and Ti: Mo=0.07~0.1, Ti: C=0.4~0.6, P+Cu: 0.3%~0.4%; Cep ≤0.38, Pcm≤0.24; the rest is Fe and unavoidable impurities.

[0024] The dephosphorization process refers to: spraying 15-25M...

Embodiment 1

[0036] The chemical composition of the billet is calculated by weight percentage: C: 0.05%, Si: 0.40%, Mn: 0.70%, P: 0.040%, Cu: 0.26%, Mo: 0.36%, Ti: 0.026%, S: 0.015%, Als: 0.015%, N: 0.004%; Ti: Mo=0.07~0.1, Ti: C=0.4~0.6, P+Cu: 0.3%~0.4%; the rest is Fe and unavoidable impurities.

[0037] The steel billet with a thickness of 200mm and a chemical composition that meets the requirements is sent into the heating furnace for heating. The heating is divided into a heating section and an equal temperature section. Stay in the uniform temperature section for 45 minutes, and the total residence time in the heating furnace is controlled at 240 minutes, and the steel billet is heated to 1290 ° C and released from the furnace for use. Next, spray 20MPa high-pressure water for 15s on the steel slab heated out of the furnace to remove the scale on each surface. Send the dephosphorized steel slab into the rolling mill for 4-6 passes of rough rolling, the rolling start temperature is 1...

Embodiment 2

[0040] The chemical composition of the billet is calculated by weight percentage: C: 0.09%, Si: 0.36%, Mn: 0.95%, P: 0.021%, Cu: 0.33%, Mo: 0.48%, Ti: 0.035%, S: 0.007%, Als: 0.036%, N: 0.003%; Ti: Mo=0.07~0.1, Ti: C=0.4~0.6, P+Cu: 0.3%~0.4%; the rest is Fe and unavoidable impurities.

[0041] Send the steel billet with a thickness of 200mm and meet the requirements of the chemical composition into the heating furnace for heating. The heating is divided into a heating section and an equal temperature section. Stay in the uniform temperature section for 45 minutes, and the total residence time in the heating furnace is controlled at 250 minutes, and the steel billet is heated to 1280 ° C and released from the furnace for later use. Next, spray 20MPa high-pressure water for 15s on the steel slab heated out of the furnace to remove the scale on each surface. Send the dephosphorized steel slab into the rolling mill for 4-6 passes of rough rolling, the rolling start temperature is...

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Abstract

The invention discloses 345 MPa level anti-seismic fire-resistant and weather-resistant steel and a preparing method of the steel. A steel billet with chemical components meeting the requirement is heated to 1250 DEG C to 1300 DEG C; high-pressure water of 15 MPa to 25 MPa is sprayed to the steel billet so as to remove an oxide skin; four to six passes of rough rolling are carried out on the steel billet, the initial rolling temperature ranges from 1120 DEG C to 1180 DEG C, the total compression ratio of rough rolling ranges from 75% to 85%, then three to five passes of finish rolling are carried out on the steel billet, the finish rolling temperature ranges from 870 DEG C to 910 DEG C, and the total compression ratio of finish rolling ranges from 60% to 80%; obtained strip steel is forced to be cooled to 640 DEG C to 690 DEG C at the speed of 15 DEG C / s to 25 DEG C / s; and after the steel billet is reeled into a roll, the steel billet is subject to natural air cooling to the room temperature. The steel prepared by the method has the good anti-seismic fire-resistant and weather-resistant properties, and is low in production cost and beneficial to application and popularization.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a 345MPa-level shock-resistant, fire-resistant and weather-resistant steel and a preparation method thereof. Background technique [0002] With the rise of high-rise, super high-rise, long-span and other structural buildings, steel structures have become the development direction of the construction industry. However, the fire resistance and anti-corrosion ability of ordinary steel structure buildings are poorer than those of concrete buildings. The fire resistance limit time of ordinary steel is short, and the yield strength will decrease a lot with the increase of its own temperature, and even completely lose its bearing capacity when it reaches above 600 °C . In addition, corrosion is also one of the main reasons for the failure of ordinary steel structure buildings. In order to consider the impact of corrosion failure, it is necessary to increase the thickn...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16
Inventor 张竹明赵宇张红斌张卫强杨春雷张瑜张志波杨奇杨豪马红权陈建泰
Owner WUKUN STEEL
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