inner banner

Factors Affecting Bright Annealing of Stainless steel Tubes

Stainless steel tube is now widely used in the market, it has a very important role in many industries. To reduce hardness and improve plasticity; to refine the grain and eliminate the internal stress, annealing must be carried out. Stainless steel tube annealing is generally carried out by continuous bright annealing furnace with ammonia decomposition protection gas for annealing of intermediate state and finished products. It can protect the bright outer surface of the stainless steel tube very well. The finished tube after annealing is also bright. This kind of tube does not need pickling. 

There are many influence factors of bright annealed stainless steel tubing, this article lists five important factors for your reference.

1. Whether the annealing temperature reaches the specified temperature
The heat treatment of stainless steel is usually solid solution heat treatment, that is what people usually called annealing, the temperature range of 1040~1120 (Japanese standard).  You can also look through the observation hole of the annealing furnace, the stainless steel tube in the annealing surface should be in incandescent state, but no softening droop appears.

2. Annealing atmosphere
Pure hydrogen is regarded as anneal atmosphere commonly, atmosphere purity had better be 99.99% above, if another part in atmosphere is inert gas, purity also can a bit lower, but it  absolutely cannot contain excessive oxygen water vapor.

3. Bright annealing furnace should be closed and isolated from the outside air; using hydrogen as a shielding gas, only one vent is vented (used to ignite the exhausted hydrogen). It can be checked by wiping in the annealing furnace with soap water in the joint gap to see whether the air run, one of the most likely places for gas to escape is where the annealing furnace enters the pipe and where the pipe comes out. The sealing ring in this place is particularly prone to wear and tear, so it should be checked and changed frequently.

4. Protect 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, the general requirements of more than 20kBar.

5. On the one hand, check whether the furnace material is dry, furnace material must be dried for the first furnace charging, Secondly, whether the stainless steel tube into the furnace remains too much water, especially if there are holes in the pipe, do not leak into it, or it will destroy the atmosphere of the stove.

That's basically what you need to pay attention to. Usually, after the furnace should be back about 20 meters of stainless steel tube will start to shine. Huashang Steel has stock for bright annealed stainless steel tube, welcome to inquiry and order.

bright annealed tube

Related News

  • How to Choose the Right Precision Stainless Steel Tubing

    How to Choose the Right Precision Stainless Steel Tubing

    March 22, 2019Stainless steel precision tubes are generally used in precision instruments or medical devices. They are not only expensive but also commonly used in key equipment and instruments. Therefore, the mate...view
  • Introduction and Application of Hexagonal Steel Pipe

    Introduction and Application of Hexagonal Steel Pipe

    May 23, 2019Hexagonal steel pipe is also called special-shaped steel pipe, including octagonal pipe, rhombic pipe, elliptical pipe and other shapes. Hexagonal steel pipe is an economic section steel pipe, includi...view
  • Comparison Between Stainless Steel Pipe and Copper Pipe

    Comparison Between Stainless Steel Pipe and Copper Pipe

    November 12, 2019Many five-star hotels require copper pipes for water supply system, but more and more hotels also accept stainless steel pipes due to cost and market reasons. This paper mainly makes a technical compa...view
  • Tubing Applications In Every Industry

    Tubing Applications In Every Industry

    August 30, 2018Just considering some of the many uses for stainless steel tubing within a single facility in only one industry demonstrates just how many ways this versatile, customizable product can be used. To ful...view
  • Excellent Performance of Seamless Hexagonal Steel Tubing

    Excellent Performance of Seamless Hexagonal Steel Tubing

    March 22, 2019Howmuch do you know about seamless hexagonalsteel tubing? Seamless hexagonalsteel tubing is a type of stainless steel products, which has been widelyused in construction, mechanical manufacturing ...view
  • Advantages Of SS Capillary Tube

    Advantages Of SS Capillary Tube

    March 22, 2019The stainless steel seamless capillary has high precision and can be used in various measuring instruments. Based on its thick-walled, small-diameter structure (usually 1/8" or smaller diameter), such...view

More Tubing Fittings To Consider

  • Special Shaped Tubes

    Special Shaped Tubes

    July 10, 2018Huashang stainless steel tube size, pipe finishing and material as per request of the customer.view
  • Blind Flanges

    Blind Flanges

    July 10, 2018Blind flange is also called blind board, and its proper name is flange cover.view
  • Coiled Tubing

    Coiled Tubing

    July 10, 2018SS tube manufacturer's seamless coiled tube can reach 1000 meters to reduce tubing unions & connection for duration.view