Please Choose Your Language
You are here: Home / Blogs / Bright (BA grade) Stainless Steel Tube Annealing Principle and Requirements

Bright (BA grade) Stainless Steel Tube Annealing Principle and Requirements

Views: 0     Author: Site Editor     Publish Time: 2022-08-30      Origin: Site

Inquire

* Bright Annealing Definition

 

Bright annealing (BA) means that the stainless steel material is heated in a closed furnace in a reducing atmosphere of inert gas and ordinary hydrogen. After rapid annealing and rapid cooling, the outer surface of the stainless steel has a protective layer, which has no reflection in the open air environment. This layer resists corrosive attack. In general, the surface of the material is smoother and brighter.

 

* Bright Annealed Steel Pipe

 

The steel pipe is processed after bright annealing. In this process, some factors are very important to the quality of the steel pipe. If the bright annealing process is improper, it will lead to cracks, which may corrode. The flexible pipe is usually in the bright annealed state.

 

* Preparation before bright annealing

 

The surface of the tube must be clean and free of other foreign objects, any material left on the surface of the tube will cause damage during processing.

 

Therefore, after understanding the customer's detailed needs, if the customer wants to produce high value-added industrial pipes, we generally recommend adding a cleaning process before bright annealing. The steel pipe is cleaned of dirt and oil stains with hot water, and then quickly air-dried into the furnace body for heat treatment, and the bright effect will be better.

 

* Protective atmosphere

 

The annealing atmosphere should be oxygen-free, forming a vacuum condition. The protective gas is usually dry hydrogen or argon for a brighter effect.

 

* Annealing temperature

 

The annealing temperature should be determined according to different stainless steel grades. Generally, the annealing temperature of austenitic steel is at least 1040 degrees, and the soaking time is not important. Higher temperatures are necessary for a brighter appearance. Heat as fast as possible, slow heat will cause oxidation.

 

Some ferritic stainless steels require lower annealing temperatures, such as TP439, which cannot be effectively bright annealed, and water quenching will form oxide scales.

 

After bright annealing, enter the final step of sizing and straightening, the surface of the stainless steel tube presents a bright appearance, and the bright annealed tube does not need to be pickled.

 

* Purpose and advantages of bright annealing:

 

1) Eliminate work hardening and obtain satisfactory metallographic structure.

 

2) Obtain a bright, non-oxidizing and corrosion-resistant surface.

 

3) Bright treatment keeps the rolling surface smooth, and a bright surface can be obtained without post-treatment.

 

Bright solution furnaces are usually divided into two types. One is a mesh-type muffle furnace, and the other is a single-tube online annealing equipment. Generally, the mesh-type muffle furnace can process steel pipes in large quantities with high efficiency. But the shortcomings of the muffle furnace are also obvious. Due to the large interior of the furnace body, the preheating time needs to be very long, so the energy consumption is also huge. Moreover, due to poor sealing, it will also use a large amount of protective gas, but the brightening effect is unsatisfactory. The online single-tube continuous bright annealing furnace does not have the above shortcomings. Therefore, it will be a better choice for manufacturers who want to produce high value-added steel pipes or want to enter the high-end steel pipe market. Hangao Tech (SEKO Machinery) also has two different models to choose from. The Zhijin type is more energy-saving and environmentally friendly, and the thermal insulation type can obtain a better light effect.

Related Products

Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.

Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
$ 0
$ 0
Explore the versatility of Hangao's Stainless Steel Coil Tube Production Line. Tailored for various applications, from industrial processes to specialized manufacturing, our production line guarantees the seamless fabrication of high-quality stainless steel coil tubes. With precision as our hallmark, Hangao is your trusted partner for meeting diverse industry requirements with excellence.
$ 0
$ 0
Embark on a journey of hygiene and precision with Hangao's Stainless Steel Fluid Tube Production Line. Tailored for sanitary applications in pharmaceuticals, food processing, and more, our cutting-edge machinery ensures the highest standards of cleanliness. As a testament to our commitment, Hangao stands out as a manufacturer where tube production machines boast exceptional cleanliness, meeting the stringent requirements of industries that prioritize purity in fluid handling systems.
$ 0
$ 0
Explore the myriad applications of titanium tubes with Hangao's Titanium Welded Tube Production Line. Titanium tubes find critical utility in aerospace, medical devices, chemical processing, and more, owing to their exceptional corrosion resistance and strength-to-weight ratio. As a rarity in the domestic market, Hangao takes pride in being a stable and reliable manufacturer for titanium welded tube production lines, ensuring precision and consistent performance in this specialized field.
$ 0
$ 0
Dive into the realm of precision with Hangao's Petroleum and Chemical Tube Production Line. Crafted for the rigorous demands of the petroleum and chemical industries, our production line excels in manufacturing tubes that meet the stringent standards required for transporting and processing crucial materials in these sectors. Trust Hangao for reliable solutions that uphold the integrity and efficiency vital to petroleum and chemical applications.
$ 0
$ 0
Experience the epitome of technological advancement with Hangao's Laser Stainless Steel Welded Tube Production Line. Boasting accelerated production speeds and unparalleled weld seam quality, this high-tech marvel redefines stainless steel tube manufacturing. Elevate your production efficiency with laser technology, ensuring precision and excellence at every weld.
$ 0
$ 0

If Our Product Is What You Want

Please get in touch with our team immediately to answer you with a more professional solution
WhatsApp:+86-158-1561-9854 
Tel: +86-139-2821-9289 
E-mail: sales6@hangaotech.com 
Add: No. 23 Gaoyan Road, Duyang Town, Yun 'anDistrictYunfu City. Guangdong Province

Quick Links

About Us

Login & Register

Guangdong Hangao Technology Co., Ltd. is China's only one with high-end precision industrial welded pipe production line full set of equipment manufacturing capabilities.
Leave a Message
Contact Us
Copyright © 2023 Guangdong Hangao Technology Co., Ltd. All Rights Reserved. Support by leadong.com | Sitemap. Privacy Policy