Due to the remarkable characteristics of stainless steel pipes, stainless steel pipes are widely used in more and more fields, especially in the decoration industry, it occupies an absolute share.
One of the advantages of stainless steel pipe is the polishing effect of its surface, and the polishing technology directly affects the appearance of the stainless steel pipe.
If the brightness determines the quality of the stainless steel pipe, what factors will affect its brightness?
In general, there are 5 factors that affect the brightness of the pipes: annealing temperature, annealing atmosphere, furnace seal, protective gas pressure and furnace water vapor.
- Annealing temperature.
The annealing we often talk about is actually solution heat treatment of stainless steel. Whether the annealing temperature reaches the specified temperature will also affect the brightness of the stainless steel pipe. The annealing temperature is 1120 degrees Celsius. We can observe through the annealing furnace that the stainless steel pipe should generally be incandescent and not soften and sag.
- Annealing atmosphere
The average person will ask, does the annealing atmosphere also affect the brightness? Yes. Currently, pure hydrogen is used as the annealing atmosphere. Note that the purity of the atmosphere is preferably greater than 99.99%. If the other part of the atmosphere is an inert gas, the purity can be slightly lower-some. Must not contain too much oxygen and water vapor, otherwise it will greatly affect the brightness.
- Furnace body seal
The tightness of the furnace body will also affect the brightness of the stainless steel tubings. The annealing furnace is usually closed and isolated from outside air. Hydrogen is usually used as a protective gas, and only one exhaust port is used to ignite the discharged hydrogen.
- Protective gas pressure
The protective air pressure in the furnace must be maintained at a certain positive pressure to prevent micro leakage. If it is a hydrogen shielding gas, it usually needs more than 20 kbar.
- Water vapor in the furnace
We must pay special attention to the water vapor in the furnace. Check whether the material of the furnace body is dry.