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Stainless steel elbow use range and welding essentials
Sep 30, 2018

In the pipeline system, the stainless steel elbow mainly plays the role of changing the direction of the pipeline. The commonly used angles are 45° and 90°180°. In addition, other abnormal angle elbows such as 60° are also included according to the engineering needs. Because stainless steel elbow has good comprehensive performance, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace and shipbuilding.


In the process of producing stainless steel elbows, the welding operation is a key process. It is usually required to keep the electrode dry when it is used, and to prevent the electrode coating from sticking to oil and other dirt, so as not to cause the weld to increase the carbon content and affect the quality of the weldment. When the elbow is welded, it is repeatedly heated to precipitate carbides, which reduces corrosion resistance and mechanical properties.


Cracks may occur due to the high hardenability after welding. In order to improve the corrosion resistance and weldability of stainless steel elbows, it is necessary to appropriately increase the appropriate amount of stability elements Ti, Nb, Mo, etc., and the weldability is better. When using the same type of chromium stainless steel electrode, preheating should be carried out above 200 °C. And tempering at around 800 °C after welding. If the weldment cannot be heat treated, a chrome-nickel stainless steel electrode should be used.

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