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What defects may appear in the processing of stainless steel profile channel steel
Stainless steel channel steel is divided into ordinary channel steel and light channel steel. Ordinary channel steel is mainly used in industrial structures such as building structures and vehicle manufacturing, and is often used in combination with I-beams. Hot-rolled stainless steel light channel steel is a wide-leg thin-walled Stainless steel profile, which has better economic benefits than ordinary hot-rolled channel steel. Stainless steel profile is mainly used for construction and steel frame structure. Stainless steel channel steel is a long steel strip with a groove shape. The processing of stainless steel channels is not as simple as expected. It needs to go through several processes. Various defects may occur in the process of smelting, forging and rolling of stainless steel channel steel.
Defects that may occur during the processing of stainless steel profile channel steel:
(1) Shrinkage cavity: Shrinkage cavity formed when molten steel shrinks in the steel mold is called shrinkage cavity.
(2) Transverse cracks: refer to the transverse cracks on the surface of the steel ingot, which are generally located on the steel ingot, and the depth is generally shallow, which can be removed by fine grinding.
(3) Longitudinal cracks: refers to the longitudinal cracks on the surface of the steel ingot, which are generally located at the upper and corners of the steel ingot. The upper cracks are very deep and difficult to eliminate by grinding.
(4) Scar: On the surface of the steel ingot, the splash and adhesion of the shell-shaped or nodular metal is called the scar, which mainly appears in the lower part of the steel ingot.
(5) Double skin: When the edge of the low-power specimen is irregularly dark and loose, a large number of oxide inclusions (mainly ferrous oxide) gather around it, which is called flip.
(6) Surface inclusions: refer to non-subtractive inclusions embedded in the surface of the ingot.
(7) Surface porosity: refers to the small holes that are exposed on the surface of the ingot and are visible to the naked eye. Mainly seen in the middle and lower part of the ingot. It is generally not deep and can be removed by finishing.
(8) Cracks: cracks appearing on the surface of the ingot when it is very cold. The reason why it is called cracking is that there is often sound at the cracking place.
(9) Rise: The spindle head rises irregularly. This kind of defect is called rise or rise.
(10) Reticulation: The reticulated protrusions on the surface of the ingot are called reticulation.
(11) Pits: The pits on the surface of the steel ingot are called pits.
(12) Secondary pouring: There are obvious reconnection marks on the surface of the ingot
(13) Flash: The metal plate existing at the head or tail of the ingot and perpendicular to the surface of the ingot is called flash.
(14) Flying wing: The thin plate formed on the surface of the ingot and perpendicular to the surface of the ingot is called flying wing.
(15) Air bubbles: Air bubbles are defects caused by poor degassing and deoxidation of molten steel or wet raw materials in the steel injection system. Generally divided into subcutaneous bubbles and internal bubbles. (Prevention method: oxidation boiling reduction deoxidation of molten steel is good, furnace and all refractory materials in contact with molten steel are dried, tapping cans, buns, prototypes, molds are dry, mold rust spots are cleaned, and oil is thin.)
(16) White spots: White spots are actually a kind of fine cracks. Just now there was a radioactive irregular sawtooth crack on the horizontal low-power sample, and a round or elliptical star-shaped silver bright spot on the vertical low-power sample, so it was called a white spot.
The above are the defects in the processing of Stainless steel profile channel steel, I hope it will be helpful to you who read the article.
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