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Control method for atmosphere corrosion resistance surface oxide scale of low-alloy cold forging steel wire rod

A technology that is resistant to atmospheric corrosion and surface oxidation, applied in metal rolling, temperature control, metal rolling, etc., can solve problems such as increasing user costs and affecting the appearance of wire rods, so as to optimize cold heading performance and increase sales prices , the effect of increasing benefits

Active Publication Date: 2017-11-07
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
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  • Application Information

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Problems solved by technology

Premature red rust during transportation will increase the cost of the user's subsequent order and affect the appearance of the wire rod

Method used

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  • Control method for atmosphere corrosion resistance surface oxide scale of low-alloy cold forging steel wire rod
  • Control method for atmosphere corrosion resistance surface oxide scale of low-alloy cold forging steel wire rod
  • Control method for atmosphere corrosion resistance surface oxide scale of low-alloy cold forging steel wire rod

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below with reference to exemplary implementations. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

[0021] The purpose of controlling the finishing temperature is to control the scale structure and total thickness. According to the continuous oxidation behavior curve of low-alloy cold heading steel in air atmosphere, the rapid oxidation range of scale is avoided, and the lower finishing temperature will make the thickness of scale on the surface of alloy cold heading steel wire rod thinner, and control the composition of scale FeO content is low, Fe 3 o 4 The content is high, and the iron oxide scale is not easy to fall off dur...

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Abstract

The invention discloses a control method for an atmosphere corrosion resistance surface oxide scale of a low-alloy cold forging steel wire rod. The method comprises finish rolling temperature control, spin temperature control and cooling speed control, wherein in finish rolling temperature control, the inlet temperature of a finishing mill is controlled to range from 830 DEG C to 870 DEG C, and the finish rolling process temperature rise is controlled to range from 30 DEG C to 60 DEG C; in spin temperature control, the spin temperature is controlled to range from 810 DEG C to 850 DEG C; and in cooling speed control, the temperature of the wire rod is controlled to range from 740 DEG C to 760 DEG C when the wire rod enters a heat preservation cover, and the temperature of the wire rod ranges from 590 DEG C to 670 DEG C when the wire rod gets out of the heat preservation cover. By means of the control method, the oxide scale with the low FeO content proportion and small thickness can be obtained, and accordingly the speed that surface red rust happens to the low-alloy cold forging steel is reduced.

Description

technical field [0001] The invention relates to a smelting and rolling process, in particular to a method for controlling the oxide scale on the atmospheric corrosion-resistant surface of a low-alloy cold heading steel wire rod. Background technique [0002] With the improvement of users' performance requirements for hot-rolled wire rods, users have begun to put forward higher requirements for wire rod surface quality, performance and corrosion resistance, especially for steel products that require higher surface quality for hot-rolled wire rods. For example, cold heading steel for fasteners, steel for welding, and steel for prestressed steel strands have strict requirements on the surface quality of hot-rolled wire rods. Premature red rust during transportation will increase the cost of the user's subsequent order and affect the appearance of the wire rod. [0003] The oxide scale structure of hot-rolled steel has a crucial influence on the surface quality of steel and is ...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B37/74B21B45/02
CPCB21B1/16B21B37/74B21B45/0203
Inventor 赵晓敏
Owner INNER MONGOLIA BAOTOU STEEL UNION
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