High-performance refractory weather-resisting building steel and its production method

A technology of fire-resistant and weather-resistant steel for construction, which is applied in the field of low-alloy steel manufacturing, can solve the problem of lack of requirements for weather resistance, and achieve the effects of high Z-direction performance, excellent welding performance, and low steel cost.

Inactive Publication Date: 2002-06-19
武钢集团有限公司
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Problems solved by technology

[0002] Before the present invention, such as the Japanese Patent Laid-Open No. 5-279735 patent published in 1993 "The production method of fire-resistant steel plates for construction with excellent toughness in the heat-affected zone of large heat input welding", the steel involved in this patent can withstand large heat input welding, and can It meets the requirements of fire resistance, and its shortcoming is that there is no requirement for weather resistance
In addition, according to the requirements of this patent, only steel plates with a thickness of more than 50 mm can be produced, and no steel plates with a thickness of less than 50 mm are involved.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: According to the steel composition requirements of the present invention, three heats of steel were smelted in a vacuum induction furnace, and the steel ingots were heated to 1220°C and rolled out of the furnace. The thicknesses of the rolled steel plates were 16mm, 40mm, and 72mm respectively, and they were respectively kept at 900°C for 45 minutes. After heat treatment for 70 minutes and 100 minutes, the tensile properties at room temperature, impact toughness at 0°C, tensile properties at 600°C, and impact toughness of HAZ at 0°C after welding with 30, 60, and 100kJ / cm large input energy were tested. , and compared with the corresponding comparison steel, see Table 1.

[0032] The room temperature tensile property of the steel of the present invention is at the same level as that of the comparison steel, but the impact toughness at 0°C is higher than that of the comparison steel, and the impact toughness of the HAZ at 0°C after welding with 30, 60, and 100k...

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Abstract

The present invention relates to a high-performance fire-resistant weather-resisting building steel and its production method. Said invention steel contains C, Si, Mn, P, S, Mo, Ti, Al, N, O, Cr, Ni, Cu, Ca, B and one or more than one kind of Nb, V and RE and the rest is Fe. After having been undergone the processes of smelting, rolling and heat treatment, said building steel possesses high strenght, high toughness and excellent fire-resisting and weather-resisting properties. The building steel can be used for providing various steel structural members whose thickness is 4-100 mm in the fields of building, civil engineering and marine structure. Under the large linear energy (50-100 kJ / cm) welding condition of gas-arc welding, electroslag welding and high-frequency resistance welding, its heat affected zone (HAZ) still possesses excellent toughness so as to greatly raise welding efficiency of engineering structure and reduce its manufacture cost.

Description

【Technical field】 [0001] The invention relates to a high-performance fire-resistant and weather-resistant building steel and a production method thereof, belonging to the field of low-alloy steel manufacturing. 【Background technique】 [0002] Before the present invention, such as the Japanese Patent Laid-Open No. 5-279735 patent published in 1993 "The production method of fire-resistant steel plates for construction with excellent toughness in the heat-affected zone of large heat input welding", the steel involved in this patent can withstand large heat input welding, and can To meet the requirements of fire resistance, its shortcoming is that there is no requirement for weather resistance. In addition, according to the requirements of this patent, only steel plates with a thickness of more than 50 mm can be produced, but no steel plates with a thickness of less than 50 mm are involved. 【Content of invention】 [0003] The purpose of the present invention is to provide a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/50C22C38/54C22C38/58
Inventor 陈晓郭爱民董汉雄邹德辉刘继雄
Owner 武钢集团有限公司
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