The characteristics of stainless steel joints are mainly determined by the amount of chromium, iron, carbon and other alloys; four common technical processes for stainless steel pipe fittings are: gas shielded welding, pickling passivation, bright solid melting, and sealing material.


1. Gas shielded welding: During welding, under the protection of gas, the chromium and nickel on the surface of stainless steel will not be oxidized, and the original characteristics and corrosion resistance of stainless steel will be retained.


2. Pickling passivation: It can make a thin, dense and hard passivation film on the outer wall of water pipes and pipe fittings, which is the root cause of preventing corrosion.


3. Bright solid melting: After the stainless steel pipe fittings have undergone the forming and welding process of customized ferrule joints, they must undergo a solid melting treatment of 1050 degrees to eliminate the internal stress caused by the deformation of the stainless steel pipe fittings, reduce stress corrosion, and restore the welding process of the pipe fittings. intergranular changes, carbides dissolve in austenite, preventing adverse effects.


4. Sealing material: The sealing material is the key point of the service life of the stainless steel pipeline, and the service life of the sealing material determines the service life of the stainless steel pipeline.





The corrosion resistance of stainless steel pipe fittings depends on the alloying elements contained in the steel. Chromium is the basic element for stainless steel to obtain corrosion resistance. When the chromium content in steel reaches about 1.2%, chromium and the oxygen in the corrosive medium act to form a thin oxide film on the steel surface ( Self-passivation film), which can prevent further corrosion of the steel matrix. In addition to chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various uses for the structure and properties of stainless steel.


The distinction between stainless steel pipe fittings is mainly based on the carbon content of iron and steel. Iron-carbon alloys with a carbon content of less than 2% are steel, and those with a carbon content of more than 2% are called iron. Steel is widely used because it has both toughness, elasticity and rigidity. All the Eaton stainless steel joints that come into contact with in life are steel, but they are called differently. For stainless steel, regardless of whether the magnet can attract it or not, as long as it meets its quality standards, it is stainless steel.