Zibo Runjin Refractrories Co., Ltd. has been consistently stable exports of long nozzle for the steelmaking tundish used by Turkey Steel Company since 2018. A batch of these long nozzle was shipped from Qingdao on September 1st.
Chemical and physical of properties
|
Chemical properties |
body |
slag |
|
|
MgO |
% |
64.68 |
|
|
Al2O3 |
% |
60.78 |
|
|
C |
% |
23.20 |
28.7 |
|
SiO2 |
% |
11.18 |
|
|
Physical properties |
|||
|
Bulk density |
g/cm3 |
2.63 |
2.51 |
|
Modulus of Rupture |
MPa |
6.76 |
6.50 |
|
Apparent Porosity |
% |
13.14 |
14.32 |
According to steel making condition of Turkish customer,we strictly adhere to technical specifications and production processes in our manufacturing,ensuring that every long nozzle exported meets quality requirements. This high-quality control has enabled us to maintain consistent eight-year export performance.
Precautions for Use
1.Inspection
Before use we should inspect whether the long nozzle has any appearance defects such as bumps, dampness, skew, or damage to the anti-oxidation coating; inspect whether holding device, support ring, argon blowing joint, and other components used in conjunction with the long nozzle are matched and qualified.
2.Installation
Place the long nozzle into the holding device, then connect the argon blowing nozzle to the argon gas connector(ensure it is firm) and confirm whether the argon blowing channel is available . Inspect whether the sealing fiber pad is intact, place it the bowl mouth of the long nozzle mouth and avoid the phenomenon of deviation or incomplete placement.
3.Operation
We insert the long nozzle into the down nozzle of the steel ladle through holding device and open the argon blowing system. In the operation, we should avoid knocking the long nozzle with tundish to avoid unexpected damage and keep the verticality of the long nozzle to prevent the steel from rushing obliquely to affect the service life of the long nozzle.
We should remove the long nozzle after casting. Then we clean the bowl and inner cavity of the long nozzle by blowing oxygen to remove the attached cold steel, impurities, etc. It is necessary to avoid blowing at the same position to prevent local thinning and perforation of the long nozzle.If there is cold steel in the bowl, we should clean up them and place a new sealing gasket. The whole process should be completed within 5 minutes to prevent the long nozzle from cracking.
During the casting process,we should keep observing.If there are cases such as thinning of the slag line, internal defects of the bowl , which do not meet the requirements for use, the long nozzle should be replaced with a new one in time.
