Spheroidizing annealing temperature control process of cold-rolled steel coil

A technology for cold-rolled steel and steel coil, applied in the field of spheroidizing annealing temperature control process of cold-rolled steel coil, can solve the problem of high hardness and achieve the effect of smooth and smooth cold-rolling process

Inactive Publication Date: 2016-05-11
JIANGSU CHUANGTAITE STEEL PROD CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cooling is too fast, the carbide particles are too fine, and it is possible to form flaky carbides, which makes the hardness higher

Method used

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Embodiment Construction

[0016] The technical solution will be described in detail below through a best embodiment, but the protection scope of the present invention is not limited to the embodiment.

[0017] A cold-rolled steel coil spheroidizing annealing temperature control process, the temperature control process comprises the following steps:

[0018] The first step: Send the steel coil to the annealing furnace, raise the steel coil from room temperature to 400°C within 3 hours, and keep the temperature at 400°C for 2 hours;

[0019] The second step: raise the steel coil from 400°C to 680°C within 5 hours, and keep it at 680°C for 18 hours;

[0020] Step 3: stop heating in the annealing furnace, and cool the steel coil in the annealing furnace for 2 hours;

[0021] Step 4: Air-cool the steel coils in the annealing furnace for 7-8 hours, and reduce the temperature of the steel coils to 300°C;

[0022] Step 5: Water-cool the air-cooled steel coil, lower the temperature of the steel coil to 90°C, ...

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PUM

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Abstract

The invention discloses a spheroidizing annealing temperature control process of a cold-rolled steel coil. The temperature control process comprises the following steps: (1) the steel coil is fed in an annealing furnace, is heated up to 400 DEG C from room temperature within 3 h, and is kept at 400 DEG C for 2 hours; (2) the steel coil is heated up to 680 DEG C from 400 DEG C within 5 h, and is kept at 680 DEG C for 18 hours; (3) the heating is stopped in the annealing furnace; and the steel coil is cooled for 2 h in the annealing furnace; (4) the steel coil in the annealing furnace is cooled by air for 7-8 hours to reach 300 DEG C; and (5) the air-cooled steel coil is cooled by water to reach 90 DEG C; and after the spheroidizing annealing operation is finished, the steel coil is discharged from the furnace. The temperature control process realizes that the size and the uniformity of carbide particles of the steel coil are suitable for cold rolling through precise annealing temperature of the steel coil and time length control, and facilitates smoothness of cold rolling process.

Description

technical field [0001] The invention relates to the technical field of pretreatment of steel coils before cold rolling, and more specifically relates to a temperature control process for spheroidizing annealing of cold-rolled steel coils. Background technique [0002] The common processing technology for steel coils used in the manufacture of auto parts is cold rolling. Steel coils should be spheroidizing annealed before cold rolling. [0003] The heating temperature of spheroidizing annealing is a key factor affecting the degree of spheroidizing. Proper selection of heating temperature can not only ensure the disappearance of flaky pearlite, but also retain a part of carbides that are not completely dissolved in austenite as the spheroidized core, and finally form a normal spheroidized structure of coarser granular carbides. When the austenitizing temperature is high, the carbides are all dissolved and homogenized, and flaky pearlite is always obtained after cooling. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D9/52
CPCC21D11/00C21D9/52
Inventor 陈显卿马远国蒉忠芳郭阳
Owner JIANGSU CHUANGTAITE STEEL PROD CO LTD
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