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Production method for boron-containing cold heading steel

A production method and technology for cold heading steel, which are applied in the production field of 10.9 grade boron-containing cold heading steel, can solve the problems of insignificant yield strength of cold heading steel, unfavorable stability of wire product quality, low silicon content, etc., and achieve less cracks. , low cost, low strength effect

Active Publication Date: 2015-11-18
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the low silicon content in the composition design, it is easy to cause the yield strength of cold heading steel to be not obvious, which has certain risks for the use of high strength cold heading steel
[0008] In addition, although there are requirements for the B element content in steel in the above article, the wide range of B element content is not conducive to the stability of wire product quality

Method used

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  • Production method for boron-containing cold heading steel
  • Production method for boron-containing cold heading steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealed cold pier steel in this example are: C: 0.21%; Si: 0.19%; Mn: 1.33%; P: 0.0017%; S: 0.006%; Al: 0.029%; Ti: 0.051%; B: 0.0019%, the rest is iron and unavoidable impurity elements. The diameter of the wire rod is 20mm, and its production process is: converter smelting, out-of-furnace refining, continuous casting of 150mm*150mm billet, high-speed wire-controlled rolling, and Stelmo wire-controlled cooling. The key control parameters are: (1) The tapping temperature is 1635°C, the carbon content of tapping is 0.07%, and the phosphorus content of tapping is 0.014%; (2) In the refining process, the refining in-place temperature is 1536°C, The temperature is at 1569°C. In the steelmaking and refining station, aluminum alloy, titanium alloy, and boron alloy are added at the end of refining, and the order of addition is: aluminum alloy is added first, then titanium alloy is added, t...

Embodiment 2

[0041] The components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealed cold pier steel in this example are: C: 0.20%; Si: 0.21%; Mn: 1.36%; P: 0.020%; S: 0.008%; Al: 0.030%; Ti: 0.046%; B: 0.0017%, the rest is iron and unavoidable impurity elements. The diameter of the wire rod is 20mm, and its production process is: converter smelting, out-of-furnace refining, continuous casting of 150mm*150mm billet, high-speed wire-controlled rolling, and Stelmo wire-controlled cooling. The key control parameters are: (1) The tapping temperature is 1640°C, the carbon content of tapping is 0.08%, and the phosphorus content of tapping is 0.016%; (2) In the refining process, the refining in-place temperature is 1563°C, The temperature is at 1588°C. In the steelmaking and refining station, aluminum alloy, titanium alloy, and boron alloy are added at the end of refining, and the order of addition is: aluminum alloy is added first, then titanium alloy is added, th...

Embodiment 3

[0043] The components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealed cold pier steel in this example are: C: 0.19%; Si: 0.25%; Mn: 1.38%; P: 0.019%; S: 0.008%; Al: 0.031%; Ti: 0.049%; B: 0.0018%, the rest is iron and unavoidable impurity elements. The diameter of the wire rod is 20mm, and its production process is: converter smelting, out-of-furnace refining, continuous casting of 150mm*150mm billet, high-speed wire-controlled rolling, and Stelmo wire-controlled cooling. The key control parameters are: (1) The tapping temperature is 1655°C, the carbon content of tapping is 0.09%, and the phosphorus content of tapping is 0.015%; (2) In the refining process, the refining in-place temperature is 1571°C, The temperature is 1588°C. In the steelmaking and refining station, aluminum alloy, titanium alloy, and boron alloy are added at the end of refining, and the order of addition is: aluminum alloy is added first, then titanium alloy is added, the m...

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Abstract

The invention relates to a production method for boron-containing cold heading steel and belongs to the field of metal materials produced in the metallurgical industry. The boron-containing cold heading steel comprises C, Si, Mn, Ti, Al, P, S, B and the balance Fe and inevitable impurities. According to the production method, the content of C, the content of Si and the content of B in the components are controlled, and metal such as Cr and V is not contained in the components. The product manufactured through the method is low in cost, few cracks are generated during production, and the performance of the steel subjected to heat treatment by users is stable; in addition, the purpose of high strength can be achieved after heat treatment, the high-strength cold heading steel has an obvious sigma 0.2 yield strength step in the using process, and thus the use safety of the cold heading steel is facilitated.

Description

technical field [0001] The invention relates to a production method of boron-containing cold heading steel, in particular to a production method of 10.9 grade boron-containing cold heading steel, and belongs to the field of metal materials produced in the metallurgical industry. Background technique [0002] Cold heading steel is a kind of low and medium carbon high-quality carbon structural steel and alloy structural steel that can be directly formed to produce screws, nuts, pins and other fasteners or cold heading forming parts under room temperature conditions. . It is widely used in automotive, machinery, construction, electrical appliances and other industries. Cold heading steel has good cold forming performance and excellent comprehensive mechanical properties. [0003] There are many kinds of 10.9 grade cold heading steel. According to the report of "Development of SCM420 alloy cold heading steel wire rod" by Li Weidong et al. in the first issue of "Metal Produ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/06
Inventor 李峰宋冉臣安学军
Owner INNER MONGOLIA BAOTOU STEEL UNION
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