Weather-proof cold heading steel wire rod for 1000MPa-grade fastener and production method of weather-proof cold heading steel wire rod

A production method and fastener technology, applied in the field of iron and steel metallurgy, can solve problems such as discussion, safety of finished fasteners, etc.

Active Publication Date: 2019-07-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not discuss the safety of finished fasteners

Method used

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  • Weather-proof cold heading steel wire rod for 1000MPa-grade fastener and production method of weather-proof cold heading steel wire rod
  • Weather-proof cold heading steel wire rod for 1000MPa-grade fastener and production method of weather-proof cold heading steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to the chemical composition of the 1000MPa weather-resistant cold heading steel wire rod in the present invention, the refining time is 30 minutes, the argon gas flow rate is 200NL / min, the argon blowing time is 20 minutes, and after standing for 25 minutes, it is poured into a section size of 280 *For a 380mm bloom, the degree of superheat is 23°C, the current intensity of electromagnetic stirring in the mold is 450A, and the current intensity of electromagnetic stirring in the solidification end is 500A. The 280*380mm bloom is heated and rolled into a steel billet with a section size of 155*155mm, and then the steel billet is inspected and the surface defect position is ground. Then use qualified steel billet to roll in high speed wire rod mill The rolling process of the wire rod is as follows: heat the billet to 1075°C, keep it warm for 110 minutes, and the temperature difference of the passing rod is 26°C; control the rolling start temperature to 970°C, t...

Embodiment 2

[0045] According to the chemical composition of the 1000MPa weather-resistant cold heading steel wire rod in the present invention, the refining time is 40 minutes, the argon flow rate is 180NL / min, the argon blowing time is 30 minutes, and after standing for 30 minutes, it is poured into a section size of 280 *For a 380mm bloom, the degree of superheat is 22°C, the current intensity of electromagnetic stirring in the mold is 450A, and the current intensity of electromagnetic stirring at the end of solidification is 550A. The 280*380mm bloom is heated and rolled into a steel billet with a section size of 155*155mm, and then the steel billet is inspected and the surface defect position is ground. Then use qualified steel billet to roll in high speed wire rod mill For wire rod, the rolling process is as follows: heat the billet to 1050°C, keep it warm for 120 minutes, and the temperature difference of the passing rod is 25°C; control the rolling start temperature to 980°C, the ...

Embodiment 3

[0047] According to the chemical composition of the 1000MPa weather-resistant cold heading steel wire rod in the present invention, the refining time is 40 minutes, the flow rate of argon gas is 220NL / min, the time of argon blowing is 30 minutes, and after standing for 30 minutes, it is poured into a section size of 280 *For a 380mm bloom, the degree of superheat is 24°C, the current intensity of electromagnetic stirring in the mold is 500A, and the current intensity of electromagnetic stirring at the solidification end is 500A. The 280*380mm bloom is heated and rolled into a billet with a section size of 155*155mm, and then the billet is inspected for flaws and the surface defects are ground. Then use qualified steel billet to roll in high speed wire rod mill For wire rod, the rolling process is as follows: heat the billet to 1100°C, keep it warm for 120 minutes, and the temperature difference of the passing rod is 25°C; control the rolling start temperature to 930°C, the fi...

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Abstract

The invention provides a weather-proof cold heading steel wire rod for a 1000MPa-grade fastener and a production method of the weather-proof cold heading steel wire rod. The steel wire rod comprises the following components in percentage by weight: 0.25%-0.55% of C, 0.10%-0.40% of Si, 0.80%-1.20% of Mn, smaller than or equal to 0.035% of P, smaller than or equal to 0.040% of S, 0.40%-0.70% of Cr, 0.15%-0.45% of Ni, 0.20%-0.40% of Cu, 0.15%-0.45% of Mo, and the balance of Fe and inevitable impurity elements. The production method comprises the steps of molten iron pretreatment, converter smelting, LF furnace refining, continuous casting, continuous rolling, billet cleaning, heating, rolling and finishing. Various properties of a 1000MPa-grade weather-proof connecting pair manufactured byusing the cold heading steel wire rod provided by the invention meet the standard requirements. The corrosion rate of the steel wire rod in the accelerated corrosion test is lower than 1/3 of that ofthe common cold heading steel.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a weather-resistant cold-heading steel wire rod for 1000MPa-level fasteners and a production method thereof. Background technique [0002] Compared with reinforced concrete structures, steel structures are gradually being used more widely due to their advantages such as easy assembly, recyclability, and environmental friendliness. In addition to traditional transmission towers and wind power towers, steel structures are also increasingly used in bridges. At present, in European and American countries, steel structure bridges account for more than 90% of new bridges. However, steel structures need to face an important problem—corrosion. For ordinary structural steel, due to the loose structure of its surface corrosion products, corrosion can continue to advance along the interface between the corrosion layer and the substrate to the interior of the substrate, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C21D8/08
CPCC21D8/08C22C38/02C22C38/04C22C38/42C22C38/44
Inventor 高航郭大勇车安常宏伟杨辉张博马立国王秉喜王宏亮李琳
Owner ANGANG STEEL CO LTD
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