The brightness of stainless steel seamless tube after annealing determines the quality of stainless steel seamless tube. There are many factors affecting the brightness of stainless steel seamless tube. The main five points are as follows:
1. Whether the annealing temperature reaches the specified temperature. Stainless steel seamless tube heat treatment is generally taken solution heat treatment, that is, people usually so-called “annealing”, high temperature resistant stainless steel seamless tube plate temperature range of 1040~1120℃(Japanese standard). You can also observe through the annealing furnace observation hole, annealing area of stainless steel seamless tube should be incandescent state, but no soft sagging.
2. Annealing atmosphere. Generally, pure hydrogen is used as an annealing atmosphere, the purity of the atmosphere is 99 percent, 99 or more, if the atmosphere is another part of the inert gas, the purity can also be a little lower, but do not contain too much oxygen, water vapor.
3, furnace body sealing. Bright annealing furnace should be closed, isolated from the outside air; With hydrogen as a protective gas, only one vent is open (to ignite the exhaust hydrogen). Check the method can be applied with soapy water in the annealing furnace each joint gap, to see whether run gas; One of the easy to run gas place is the annealing furnace into the stainless steel seamless tube and stainless steel seamless tube place, the sealing ring is particularly easy to wear, often check often change.
4. Protect gas pressure. In order to prevent micro leakage, the protective gas in the high temperature resistant stainless steel seamless tube plate furnace should maintain a certain positive pressure. If it is hydrogen protective gas, it is generally required to be above 20kBar.
5. Water vapor in the furnace. On the one hand, check whether the furnace material is dry, the furnace material should be dried for the first time; The second is whether the stainless steel seamless pipe into the furnace remains too much water stains, especially if there is a hole above the pipe, do not leak into it, otherwise it will destroy the furnace atmosphere.
Should pay attention to is basically these, normal, after the furnace should be back about 20 meters of high temperature resistant stainless steel seamless tube plate will begin to shine, bright reflective kind.
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