06
2022
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04
Cause analysis of the accident at the breathable paving brick location
Source： Innovation Materials
Release time：2022-04-06 15:04
The function of breathable seat bricks is to protect the breathable core. If abnormal cracking occurs during use, not only will it fail to provide protection, but in severe cases, accidents may occur. The main reasons for cracks in breathable seat bricks include not only substandard quality of the bricks themselves, but also various factors in the steel plant's operating environment that can affect the stability of the breathable seat bricks.
The function of breathable seat bricks is to protect the breathable core. If abnormal cracking occurs during use, not only will it fail to provide protection, but in severe cases, accidents may occur. The main reasons for the cracking of breathable seat bricks include not only the substandard quality of the bricks themselves, but also various factors in the steel mill's operating environment that affect the stability of the breathable seat bricks.
Unreasonable design of breathable seat bricks is mainly reflected in the physicochemical indicators. Unreasonable material ratios result in low resistance to thermal shock, leading to cracking and breakage during use, causing steel leakage. To solve this problem, the material ratio of breathable seat bricks needs to be adjusted to improve thermal shock performance; additionally, adding steel fibers can increase the strength and stability of the bricks to some extent.
Figure 1 Breathable Seat Bricks
In domestic steel mills, breathable bricks are mostly installed directly on the steel shell, while a few use a layer of material on the steel shell. Ke Chuang Xin Cai recommends the latter method because the steel shell may deform unevenly after long-term use due to high temperatures, lifting and impact, and unpacking impact. When the breathable bricks are installed, the bottom of the breathable seat bricks may not be in close contact with the bottom steel shell of the converter, resulting in gaps that may cause cracking and steel leakage at the bottom of the breathable bricks. From a mechanical point of view, an uneven bottom on the seat brick is equivalent to adding a fulcrum. Under the action of hydrostatic pressure and thermal shock, the brick is easily cracked. Therefore, when installing breathable bricks, we recommend smoothing the steel shell with chrome corundum castable and replacing severely deformed bottom plates in a timely manner.
To facilitate installation and removal of breathable seat bricks, steel mills usually leave a gap of 40-100mm between the seat bricks and the bottom bricks, which is then filled with castable. We recommend using high-quality, superior corundum castable, which has good fluidity and corrosion resistance. Poor quality filler material will be consumed too quickly after being corroded by molten steel, exposing and cracking the breathable seat bricks, affecting their use.
Figure 2 Steel Shell Bottom Plate
With the rapid development of steelmaking technology, secondary refining has become an important part of the steelmaking process, and the correct use of breathable bricks is closely related to production safety. Ke Chuang Xin Cai has focused on the production of breathable bricks for more than 20 years. Through multiple processes such as raw material selection, experimental testing, and gas volume testing, we ensure that each breathable core and breathable seat brick leaving the factory is of high quality to meet the production needs of steel mills.
Source: Luoyang Ke Chuang Xin Materials Co., Ltd.: https://www.kcnh.com/
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