The core of stainless steel flange
Effectiveness (based on actual reports)
Fundamentally: This is the outstanding advantage of stainless steel flanges. The dense chromium oxide passivation film formed on its surface can effectively resist corrosion from media such as water, steam, acid, alkali, and salt.
Meaning: It greatly extends the service life of pipeline systems, reduces the risk of leakage and frequent replacement costs caused by corrosion, and is particularly suitable for handling corrosive media.
Excellent high and low temperature performance
High temperature end: Austenitic stainless steel flanges (such as 304, 316) can maintain strength and oxidation ability at high temperatures, and are not prone to producing oxide scales.
Low temperature end: In low-temperature or ultra-low temperature environments, its toughness will not significantly decrease, there is no low-temperature brittleness, and it is suitable for cryogenic engineering.
Comparable resilience
Stainless steel material itself has high mechanical strength, which enables flanges to withstand high pipeline pressure and external loads.
Its toughness enables it to adapt to certain vibrations and impacts, with high safety.
Hygiene and Cleanliness
The surface is smooth and dense, not easy to accumulate dirt, substances or microorganisms, and is easy to clean and specific to the actual situation.
Toxic detection, no precipitation, and will not contaminate the medium.
Beautiful and easy to maintain
The surface usually has a metallic luster, is beautiful and can maintain long-term brightness without the need for additional protection such as painting, and has low maintenance costs.
Main industrial applications
Based on the above, stainless steel flanges play a role in quality in the following industries:
Petrochemical and Chemical Industry
Application: This is one of the industries with high requirements for applications. Used to connect pipelines for transporting corrosive raw materials, intermediates, and products, such as acids (sulfuric acid, hydrochloric acid), bases, solvents (based on actual reports), etc.
Selection: Stainless steel flanges with high molybdenum content such as 316 or 316L are often used to resist chloride ion corrosion and pitting corrosion.
Food, Beverage, and Pharmaceutical Industries
Application: Strictly follow hygiene standards (such as FDA, GMP). Used for all links that come into contact with materials, such as production lines, fermentation tanks, ingredient systems, and clean pipelines.
Requirement: 304/316 stainless steel flanges that are often mechanically polished or electrolytically polished should be confirmed to have a smooth, sterile, and easy to clean surface, and appropriate measures should be taken to prevent product contamination.
Ocean Engineering and Shipbuilding
Application: Used for seawater cooling systems, ballast water systems, and pipelines that come into contact with seawater on ships. The high salinity environment of seawater requires high material properties (based on actual reports).
Selection: 316L or other duplex stainless steel flanges are used due to their excellent resistance to seawater corrosion and pitting corrosion.
Energy and Power Industry
Application: In the nuclear power industry, it is used for high-purity water and auxiliary system pipelines in nuclear islands; In the thermal power industry, it is used for quality requirement systems such as water supply and condensate; In the new energy industry, such as molten salt pipelines for solar thermal power generation.
Requirement: Emphasize high purity, (based on actual reports), and long-term operation.
Business and Special Environment
Application: Ultra pure water and high-purity gas delivery system for semiconductor chip factories; Pipelines in the biological laboratory; Atmospheric exposure pipelines in coastal or highly polluted industrial areas.
Requirement: There are detailed requirements for the purity, (based on actual reports) performance, and pollution characteristics of the material, and EP grade (electrolytic polishing) stainless steel flanges are commonly used.
Water Treatment and Environmental Protection Engineering
Application: Used for critical pipeline connections in sewage treatment, seawater desalination, purified water production and other equipment, capable of withstanding corrosion from treatment agents and complex water quality.
Selection precautions
Although significant, when selecting stainless steel flanges, attention should also be paid to:
Cost considerations: The initial procurement cost is usually higher than that of carbon steel flanges.
Avoid chloride ion stress corrosion: In specific high-temperature environments, chloride ion media may cause stress corrosion cracking in austenitic stainless steel, and careful selection of materials should be made according to the specific environment (such as considering the use of duplex stainless steel).
Preventing galvanic corrosion: When connected to other metals such as carbon steel, insulation measures should be taken to prevent electrochemical corrosion caused by potential differences.