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Method for producing ultralow-rigidity annealing-free cold forging steel

A production method and technology for cold heading steel, applied in the field of metal materials and processing, and cold heading steel production, can solve problems such as fatigue performance affecting the surface quality of fasteners, pollute the environment, surface decarburization, etc., and achieve improved temperature and controlled rolling. technology, reduce environmental pressure, and improve the effect of product plasticity

Inactive Publication Date: 2014-06-25
张家港联峰钢铁研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annealing process not only increases the cost, but also pollutes the environment, especially for a large number of small and medium-sized enterprises. If the annealing equipment is poor or the process is not properly controlled, it will also lead to surface decarburization, which will seriously affect the surface quality of fasteners. Fatigue performance

Method used

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  • Method for producing ultralow-rigidity annealing-free cold forging steel
  • Method for producing ultralow-rigidity annealing-free cold forging steel
  • Method for producing ultralow-rigidity annealing-free cold forging steel

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Embodiment 1

[0014] As a specific embodiment of the present invention, the aforementioned ultra-low hardness annealing-free cold heading steel production method, wherein the composition of the cold heading steel is as follows: C content is 0.19%, Si content is 0.07%, Mn content is 0.84%, B content is 0.0023%, Ti content is 0.034%, P content is 0.013%, S content is 0.001%, Alt content is 0.029%, and the balance is Fe and unavoidable impurities. The cooling process of the roller table is to control the speed of the roller table to 0.150-0.320 m / s, and the specification of the cold heading steel is Φ8mm. After adopting this production method and component proportion, the mechanical properties and mechanical properties of the finished product after hot rolling are as follows:

[0015]

[0016] The mechanical properties and mechanical properties can fully meet the requirements of annealing-free 8.8 grade cold heading steel.

[0017] The microstructure is ferrite and pearlite, the ferrite co...

Embodiment 2

[0019] As a specific embodiment of the present invention, the aforementioned ultra-low hardness annealing-free cold heading steel production method, wherein the composition of the cold heading steel is as follows: C content is 0.20%, Si content is 0.07%, Mn content is 0.85%, B content is 0.0028%, Ti content is 0.036%, P content is 0.013%, S content is 0.001%, Alt content is 0.027%, and the balance is Fe and unavoidable impurities. The cooling process of the roller table is to control the speed of the roller table to 0.150-0.320 m / s, and the specification of the cold heading steel is Φ16mm. After adopting this production method and component proportion, the mechanical properties and mechanical properties of the finished product after hot rolling are as follows:

[0020]

[0021] The mechanical properties and mechanical properties can fully meet the requirements of annealing-free 8.8 grade cold heading steel.

[0022] The microstructure is ferrite and pearlite, the ferrite c...

Embodiment 3

[0024] As a specific embodiment of the present invention, the aforementioned ultra-low hardness annealing-free cold heading steel production method, wherein the composition of the cold heading steel is as follows: C content is 0.21%, Si content is 0.07%, Mn content is 0.95%, B content is 0.0023%, Ti content is 0.036%, P content is 0.011%, S content is 0.001%, Alt content is 0.025%, and the balance is Fe and unavoidable impurities. The cooling process of the roller table is to control the speed of the roller table to 0.220-0.440 m / s, and the specification of the cold heading steel is Φ22mm. After adopting this production method and component proportion, the mechanical properties and mechanical properties of the finished product after hot rolling are as follows:

[0025]

[0026] The mechanical properties and mechanical properties can fully meet the requirements of annealing-free 8.8 grade cold heading steel.

[0027] The microstructure is ferrite and pearlite, the ferrite c...

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Abstract

The invention relates to a method for producing ultralow-rigidity annealing-free cold forging steel. The ultralow-rigidity annealing-free cold forging steel comprises the following components in percentage by weight: 0.19%-0.22% of C, less than or equal to 0.08% of Si, 0.80%-1.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, more than or equal to 0.025% of Alt, 0.025%-0.050% of Ti, less than or equal to 0.035% of B and the balance of Fe and inevitable impurities. The production process comprises the following steps: smelting; continuously casting; heating; carrying out finish rolling; carrying out final rolling; slightly cooling; spinning into a ring; cooling a Stelmor roller way, wherein the heating temperature is 1090-1170 DEG C, the rolling starting temperature is 1000-1060 DEG C, the finish rolling temperature is 850-900 DEG C, the slight cooling temperature is 800-850 DEG C, the cooling speed of the Stelmor roller way is 0.10-0.40 m / s. The method disclosed by the invention can be used for reducing the usage amount of silicon and chromium, enhancing the plasticity of a product and reducing the rigidity of the steel.

Description

technical field [0001] The invention relates to a production method of ultra-low hardness annealing-free cold heading steel, belonging to the technical field of metal materials and processing. It is suitable for manufacturing high-strength bolts and stud fasteners in industries such as infrastructure and automobiles, and belongs to the technical field of cold heading steel production. Background technique [0002] With the sustained and rapid development of my country's economy, the demand for high-strength fasteners in infrastructure construction and the automotive industry has grown rapidly. In 2013, the output of fasteners in my country was as high as 7.3 million tons, which has been growing in recent years. [0003] Cold heading steel wire rods are mainly used to manufacture bolts, nuts, screws and other fasteners and some cold-formed parts. "Two pulling and one annealing" process, that is, several processes such as pickling, drawing, spheroidizing annealing (or soften...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/00
Inventor 汪建元张先轶王进梅凯柏京波郭峰李韶光
Owner 张家港联峰钢铁研究所有限公司
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