Please Choose Your Language
You are here: Home / Blogs / Reasons for Corrosion of Stainless Steel Welded Pipe

Reasons for Corrosion of Stainless Steel Welded Pipe

Views: 0     Author: Kevin     Publish Time: 2024-06-15      Origin: Site


Some stainless steel welded pipe after the completion of production, after a period of time there is corrosion on the surface, and even cracking, why is that?

Because in the production process of welded pipes, a very important step is ignored, that is, "annealing". In the process of steel smelting and production, we will adjust the element formula to make the steel achieve the characteristics we need, such as Cr, Cr, Ni, N, Nb, Ti, Mn, Mo, Si and other metal elements. The performance we need to improve is the high corrosion resistance of steel, which is what we call stainless steel. The corrosion resistance of stainless steel comes from an element contained in the formula - Cr. When the content of Taipa reaches a peak, the corrosion resistance of steel will be greatly improved. The general Cr content of stainless steel should reach at least 10.5%.

Common corrosion types: intergranular corrosion, stress corrosion

Intergranular corrosion, its the phenomenon of intergranular corrosion in the welding process of welded pipe, due to the high temperature resulting in a chemical reaction between the weld and the internal elements of the material, the carbon element and chromium element in the steel form a chromium compound (Cr23C6), which makes the grain boundary area chromium poor, and ultimately leads to intergranular corrosion.

Stress corrosion comes from the reaction force generated when the steel strip is deformed by external pressure during the welding process in the forming stage, and will remain in the inside of the welded pipe after welding. If not eliminated in time, the hardness of the welded pipe will become particularly high, and it is difficult to carry out the next processing.

In view of these two potential quality problems, how can our equipment achieve a thorough solution?

Features of the Bright Annealing Machine of Hangao Technology Company:

1, fine grain, uniform steel structure and composition.

2, eliminate the internal stress of steel and prevent deformation and cracking.

3, reduce the hardness of steel, improve plasticity, in order to facilitate subsequent processing.

Five detailed features of bright annealing equipment:

1, the furnace body sealing performance is good, poor sealing performance will let the gas loss in the furnace body, can not play a bright role.

2, the water gas in the furnace body will cause the heating water gas to evaporate, and the evaporated water gas will be attached to the surface of the stainless steel pipe and oxidized.

3, the gas pressure in the furnace body, in order to avoid the outside gas penetration into the furnace body, the pressure in the furnace should be greater than the outside pressure.

4, annealing temperature control, whether to achieve the best annealing temperature of steel pipe material.

5, the required gas in the annealing process, stainless steel pipe annealing gas is the first choice of pure hydrogen, because the gas purity is the best, wireless close to 100%, can not be rich in too much oxygen, water gas. Because gas is the primary reason for affecting the quality of stainless steel pipes.

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
Tel: +86-139-2821-9289 
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 | Sitemap. Privacy Policy