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No-coating weather-proof round steel production method

A production method and coating-free technology, which is applied in the production field of coating-free weather-resistant round steel, can solve problems such as the lack of high-strength coating-free bolt production technology

Active Publication Date: 2017-03-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no production process for high-strength paint-free bolts

Method used

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  • No-coating weather-proof round steel production method
  • No-coating weather-proof round steel production method
  • No-coating weather-proof round steel production method

Examples

Experimental program
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Embodiment Construction

[0022] A method for producing coating-free weather-resistant round steel, the chemical composition of which is: C: 0.21-0.25%, Si: 0.13-0.28%, Mn: 0.60-0.75%, Cr: 0.70-0.90%, Ni: 0.38 ~0.45%, Cu: 0.30~0.40%, V: 0.04~0.07%, Al: 0.015~0.035%, Ti: 0.010~0.030%, B: 0.0010~0.0030%, H≤2ppm, the rest is Fe and unavoidable Impurity elements, P≤0.012%, S≤0.005%. Adding 0.30~0.40% Cu element can improve the atmospheric corrosion resistance of this round steel, and at the same time, it can also improve the strength and yield ratio of the steel when used in conjunction with P element.

[0023] The section size of the billet is 150*150mm2, which can ensure the uniform heat transfer of the billet during heating, and meet the requirements of low-temperature heating, and avoid copper embrittlement caused by high rolling temperature, which will affect the surface quality.

[0024] Heating process: heat storage furnace is used for heating, including non-heating section, preheating section, hea...

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Abstract

The invention discloses a no-coating weather-proof round steel production method. A heating process is characterized in that a heat storage heating furnace is used for heating; a rolling process is characterized in that a low-temperature rolling process is adopted; and a cooling process is characterized in that a wind sheltering stack cooling mode is adopted for cooling. Weather-proof round steel produced through the method can be used for producing 10.9-grade high-strength no-coating weather-proof bolts, can be widely applied to no-coating weather-proof steel bridges, and has the effects of energy conservation, environmental protection and beauty.

Description

technical field [0001] The invention relates to a production process of round steel, in particular to a production method of coating-free weather-resistant round steel. Background technique [0002] my country is a big bridge country. After the bridge is completed, it needs to be treated with anti-rust coating. Coating-free weather-resistant steel bridges have technical advantages such as reducing manufacturing costs, improving construction efficiency, and energy saving and environmental protection. Therefore, my country began to build the first coating-free weather-resistant railway steel bridge on the Zangmu Yarlung Zangbo River for the first time, so high-strength weather-resistant bolts are required . At present, there is no production process for high-strength paint-free bolts. Contents of the invention [0003] The purpose of the present invention is to provide a method for producing weather-resistant round steel without coating. The weather-resistant round steel ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/50C22C38/42C22C38/46C22C38/04C22C38/02C22C38/06C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/50C22C38/54
Inventor 江雁
Owner NANJING IRON & STEEL CO LTD
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