Tuesday, January 4, 2022

Selection of Stainless Steel for Handling Hydrofluoric Acid HF By wilsonpipeline.com

Hydrofluoric Acid is extremely aggressive and attacks most metals and glass. The approach to the selection of stainless steel is similar to that for hydrochloric acid.

Commercially concentrated acid is around 40wt. %. Plastics are normally considered for handling hydrofluoric acid.
The common stainless steel types, 304 stainless steel and 316 stainless steel should be considered non-resistant to hydrofluoric acid at any concentration and temperature.

Corrosion resistance of stainless steel

The iso-corrosion diagram 0.1 mm/year lines are represented for stainless steel 316 types (red) and a 6% molybdenum austenitic types (green)

Selection-of-stainless-steel-for-handling-hydrofluoric-acid-HF

Higher grades of stainless steel can have limited resistance, up to around 2% maximum at ambient temperatures, but may suffer local attack, mainly as crevice and pitting corrosion, even at such low concentrations.



Uses for hydrofluoric acid with stainless steel

Hydrofluoric acid is used, along with nitric acid, in stainless steel pickling solution and paste preparations. Its main function is to loosen and help remove scale deposits. Incorrect use can be the cause of pitting problems if the solutions or pastes are left in contact with the stainless steel too long. It is very important that the manufacturers / suppliers instructions are followed to avoid damage to stainless steel products when using products containing hydrofluoric acid.

Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Related Posts:

  • TUBOTECH 2017TUBOTECH 20179th International Tube, Fitting, Pipes, Valves and Components Trade FairDate: 10/3/2017 – 10/5/2017Venue: Sao Paulo Expo, Sao Paulo… Read More
  • Tube & Pipe Guangzhou 2017Tube & Pipe Guangzhou 2017China (Guangzhou) International Tube & Pipe Industry ExhibitionDate: 6/28/2017 – 6/30/2017Venue: China Impor… Read More
  • Pipeline Transport 2017Pipeline Transport 2017XIII International Technical Workshop Designing, Construction & Operation of Onshore and Subsea PipelinesDate: 5/18/2017 &… Read More
  • API Pipeline Conference And Control Room Forum 2017API Pipeline Conference And Control Room Forum 2017API Pipeline Conference And Control Room ForumDate: 4/25/2017 – 4/27/2017Venue: Hyatt Regency… Read More
  • Shanghai Tube Expo 2017Shanghai Tube Expo 201711th Shanghai Tube Expo and China Pipe Fittings ExpoDate: 10/25/2017 – 10/27/2017Venue: Shanghai New International Expo C… Read More

0 comments:

Post a Comment

Standard Reference for Seamless Steel Pipe

 1. Seamless steel tube for structure (GB / T8162-1999) is a seamless steel pipe for general structure and mechanical structure. 2. Seamles...