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Factors affecting the brightness of stainless steel seamless tube

Factors affecting the brightness of stainless steel seamless tube

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  • Time of issue:2021-10-25 11:24
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(Summary description)The brightness of stainless steel seamless tube after annealing determines the quality of the product.

Factors affecting the brightness of stainless steel seamless tube

(Summary description)The brightness of stainless steel seamless tube after annealing determines the quality of the product.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2021-10-25 11:24
  • Views:
Information

1.annealing temperature is up to the specified temperature

 

Stainless steel heat treatment is generally to take solution heat treatment, that is, people usually so-called "annealing", the temperature range is 1120℃(Japanese standard).You can also observe through the annealing furnace observation hole, the stainless steel tube in the annealing area should be incandescent, but there is no softening sag.
 

 

2.annealing atmosphere

 

Generally, pure hydrogen is used as the annealing atmosphere. The purity of the atmosphere is better than 99.99%. If the other part of the atmosphere is inert gas, the purity can also be lower, but it must not contain too much oxygen and water vapor.

 

3. Sealing of furnace body

 

The bright annealing furnace shall be enclosed and isolated from the outside air;With hydrogen as a guard gas, only one vent is open (to ignite the vented hydrogen).The method of inspection can be used to wipe the cracks of each joint in the annealing furnace with soap and water to see whether the air runs away;One of the most easy to run out of air is the annealing furnace into the pipe place and out of the pipe place, the sealing ring in this place is particularly easy to wear, often check and change.

 

 

4.protect the gas pressure

 

In order to prevent micro-leakage, the protective gas in the 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 furnace

 

On the one hand, check whether the furnace body material is dry, the furnace body material must be dried;The second is whether the stainless steel pipe into the furnace remains too much water stains, especially if there are holes in the pipe, do not leak in, otherwise the furnace atmosphere will be destroyed.
 

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