The pickling passivation steps and effects of Stainless Steel Weld Elbow are determined by both the passivation process and the stainless steel stamping elbow material itself. Specific influencing factors include the metallographic structure of stainless steel, the elements contained in the stainless steel elbow, the processing state of stainless steel, etc. In the composition of elements, chromium and nickel are elements with strong passivation, and the passivation of iron is smaller than that of iron. Therefore, the higher the content of chromium and nickel, the stronger the passivation of stainless steel. Ferrite and austenite stainless steel stamping elbows have a relatively uniform structure and good passivation. After heat treatment, the metallographic structure of martensitic stainless steel is mostly phase structure, so the passivation is not strong. The smooth surface of the stainless steel stamping elbow after mechanical processing has good passivation. The surface of the workpiece obtained by forging, sandblasting, etc. is relatively rough, which is not conducive to the passivation effect. If there is no requirement for electroplating or other coatings, as long as it is a stainless steel stamping elbow part. Usually, it is pre-treated and passivated before it can be used as a finished product or assembled into a component.

Stainless steel elbow pipe fittings are connected, vibration-resistant, and the connection parts are made at one time, which avoids the possibility of loose joints. The construction is convenient, and on-site welding and threading operations are avoided. The service life of stainless steel elbow pipe fittings is good. Field corrosion test data show that the service life of stainless steel elbow pipe fittings can reach 100 years. Stainless steel elbow pipe fittings require almost no maintenance. Therefore, its performance-price ratio is good, the operating life cost is low, and the economic benefits are obvious. The on-site installation of stainless steel elbow pipe fittings is convenient. The installation time is only 1/3 of that of welding pipe fittings or threading, which shortens the construction period and cost and avoids water leakage. Elbow pipe fittings are controlled and used according to the method and principle in the connection use. They have good installation characteristics and value and need to be used in a continuous manner.