Reinforcing bar for ultralow temperature environments

An ultra-low temperature and environmental technology, applied in the field of steel bars, can solve the problem of low low temperature performance, improve welding performance, reduce the damage of impact toughness and welding performance, and improve corrosion resistance.

Inactive Publication Date: 2016-05-04
广西丛欣实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a steel bar for ultra-low temperature environment, which can solve the problem of low low-temperature performance of the existing low-temperature-resistant steel bar in an ultra-low temperature environment below -165°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The steel bars used in the ultra-low temperature environment in this embodiment include the following chemical components in mass percentage: C0.052%, Si0.25%, Mn1.25%, S0.002%, P0.005%, Ni6.8%, Ti0.02%, Nb0.02%, Cu0.18%, Al0.03%, N0.004%, Ca0.004%, the rest is Fe and unavoidable impurities.

[0012] During production, the converter is used for smelting according to the above chemical composition. After refining outside the furnace, the steel billet is continuously cast, and the billet is sent to the heating furnace for heating and rolling. After rolling, it is sent to the cooling bed for natural air cooling to room temperature. Quenching and tempering treatment, the quenching temperature is 920°C, and the tempering temperature is 600°C.

[0013] The room temperature performance of the steel bar used in the ultra-low temperature environment in this example is as follows: yield strength is 589MPa, tensile strength is 693MPa, and elongation after fracture is 12.8%; the lo...

Embodiment 2

[0015] The steel bars used in the ultra-low temperature environment in this embodiment include the following chemical components in mass percentage: C0.04%, Si0.18%, Mn0.8%, S0.005%, P0.006%, Ni5%, Ti0. 03%, Nb0.01%, Cu0.1%, Al0.04%, N0.003%, Ca0.005%, the rest is Fe and unavoidable impurities.

[0016] During production, the converter is used for smelting according to the above chemical composition. After refining outside the furnace, the steel billet is continuously cast, and the billet is sent to the heating furnace for heating and rolling. After rolling, it is sent to the cooling bed for natural air cooling to room temperature. Quenching and tempering treatment, the quenching temperature is 920°C, and the tempering temperature is 600°C.

[0017] The room temperature performance of the steel bar used in the ultra-low temperature environment in this example is as follows: yield strength is 575MPa, tensile strength is 672MPa, and elongation after fracture is 11.7%; the low te...

Embodiment 3

[0019] The steel bars used in the ultra-low temperature environment in this embodiment include the following chemical components in mass percentage: C0.07%, Si0.3%, Mn1.5%, S0.005%, P0.008%, Ni7.5%, Ti0.01%, Nb0.03%, Cu0.25%, Al0.02%, N0.0066%, Ca0.001%, the rest is Fe and unavoidable impurities.

[0020] During production, the converter is used for smelting according to the above chemical composition. After refining outside the furnace, the steel billet is continuously cast, and the billet is sent to the heating furnace for heating and rolling. After rolling, it is sent to the cooling bed for natural air cooling to room temperature. Quenching and tempering treatment, the quenching temperature is 920°C, and the tempering temperature is 600°C.

[0021] The room temperature performance of the steel bar used in the ultra-low temperature environment in this example is as follows: yield strength is 562MPa, tensile strength is 681MPa, elongation after fracture is 10.2%; low temperat...

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Abstract

The invention discloses a reinforcing bar for ultralow temperature environments and relates to the technical field of reinforcing bars. The reinforcing bar comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.18-0.3% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.008% of P, 5-7.5% of Ni, 0.01-0.03% of Ti, 0.01-0.03% of Nb, 0.1-0.25% of Cu, 0.02-0.04% of Al, 0.003-0.0066% of N, 0.001-0.005% of Ca and the balance being Fe and inevitable impurities. The reinforcing bar solves the problem that a conventional low-temperature resistant reinforcing bar has a relatively poor low temperature property under the ultralow temperature environments of below minus 165 DEG C.

Description

technical field [0001] The invention relates to the technical field of steel bars, in particular to a steel bar used in an ultra-low temperature environment. Background technique [0002] Steel bars are widely used in various modern building structures. There are many types of steel bars, and steel bars with corresponding performance should be used according to different engineering requirements. Among them, low temperature resistant steel bars are mainly used in civil engineering construction in severe cold areas, low temperature In reinforced concrete structures such as construction projects in marine environments and liquefied natural gas storage tank engineering. At present, domestic steel bars used in low-temperature environments mainly rely on imported low-temperature-resistant special steel bars, which are costly, and the yield strength of existing low-temperature-resistant steel bars is lower than 500MPa, and the elongation rate under maximum force is about 5%, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/14C22C38/12C22C38/16C22C38/06E04C5/01
CPCC22C38/02C22C38/001C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16E04C5/01
Inventor 王剑平王雪峰
Owner 广西丛欣实业有限公司
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