Controlling method for scales on surface of low-carbon cold heading steel hot-rolled wire rods
A technology for low-carbon cold heading steel and hot-rolled wire rod, applied in the field of steel rolling, can solve the problems of broken wire, easy falling off of hot-rolled wire rod, difficulty in obtaining scale-removing iron oxide scale, etc.
Active Publication Date: 2014-01-29
SHOUGANG CORPORATION
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Problems solved by technology
The oxide scale is too thin, and it is difficult to remove the thinner oxide scale by mechanical peeling
If the iron oxide scale is too thick, the hot-rolled wire rod is easy to fall off during handling and transportation, and it is easy to scratch the surface of the wire rod, causing wire breakage in the subsequent drawing process
[0003] Since low-carbon cold heading steel generally adopts slow cooling process after rolling, it is difficult to obtain iron oxide scale with good descaling performance by adopting traditional production process.
There is no report on scale thickness control of low carbon cold heading steel
Method used
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Embodiment Construction
[0019] The present invention is 160mm in Shougang No. 1 wire rod 2 It is used in the production of Φ6.5mm SWRCH22A wire rod, which obviously controls the wire rod to fall off during transportation and improves the mechanical descaling performance of the oxide scale. The specific process and performance data are shown in Table 1:
[0020] Table 1 shows the thickness, mechanical properties and mechanical descaling properties of Φ6.5mm low carbon cold heading steel SWRCH22A wire rod before and after control
[0021]
[0022] Table 1 shows the thickness, mechanical properties and mechanical descaling performance of the scale before and after control in the examples. Under the precondition of not affecting the mechanical properties of the wire rod, by controlling the finish rolling temperature, the spinning temperature and the cold stage before the phase change The speed and other methods control the iron sheet in a thickness range that is easy to mechanically descaling and will not fall...
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Abstract
A controlling method for scales on surface of low-carbon cold heading steel hot-rolled wire rods belongs to the field of steel rolling. The method includes steps of precision rolling temperature control, spinning temperature control, and phase-change forepart cooling speed control for an air cooling line. The technical parameters of control includes: controlling the temperature of an entrance of a precision rolling mill in a range of from 900 DEG C to 950 DEG C; controlling the temperature rise in the precision rolling process in a range of from 80 DEG C to 100 DEG C; controlling the spinning temperature in a range of from 880 DEG C to 920 DEG C; adjusting a heat preservation hood of the air cooling line and blower level and controlling the cooling speed of the phase-change forepart of the spun rods in a range of from 2 DEG C per second to 5 DEG C per second; controlling the hood entry temperature in a range of from 760 DEG C to 700 DEG C; and advancing the phase-change area and controlling the time when the wire rods stay in a high-temperature oxidation section in a range of from 60 seconds to 100 seconds. By the method, the thickness of the scales on the surface of the hot-rolled wire rods is controlled evidently in the production of low-carbon cold heading steel SWRCH22A wire rods, mechanical dephosphorization capability is enhanced remarkably while falling during transportation is avoided, and broken rate in spinning and wastage of dies during drawing are reduced.
Description
Technical field [0001] The invention belongs to the field of steel rolling, and in particular provides a method for controlling the surface oxide scale of low-carbon cold-headed steel hot-rolled wire rod, which is applied to the production of cold-drawn low-carbon cold-headed steel hot-rolled wire rod in a high-speed wire rod factory. Low-carbon cold-headed steel hot-rolled wire rod surface oxide scale control technology. Background technique [0002] Low-carbon cold-headed steel wire rods are mainly used to make standard parts. Users need to use mechanical peeling methods to remove surface oxide scale before cold drawing. Because the iron oxide scale is hard and brittle and difficult to deform, the iron oxide scale is not cleanly removed. During the subsequent cold drawing process, the surface of the steel wire will be damaged, causing wire breakage in the subsequent processing, and aggravating the wear of the mold, thereby affecting the life of the wire drawing mold and the pro...
Claims
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IPC IPC(8): B21B37/74
Inventor 李舒笳王丽萍罗志俊王猛邓素怀佟倩
Owner SHOUGANG CORPORATION