Method for properly cleaning stainless steel elbows

Stainless steel elbows have a certain degree of corrosion resistance, heat resistance and wear resistance. Usually used in power plant, chemical, petroleum and other equipment materials.

Stainless steel elbows have poor weldability. Pay attention to the welding process, heat treatment conditions and the selection of suitable welding electrodes.

The stainless steel elbow is mainly stainless steel. The chemical composition of the stainless steel will keep the surface of the stainless steel elbow from corrosion and rust for a long time. In cleaning, we also need to pay attention to the following two aspects:

1. According to the requirements of the workpiece and the surface condition, use alkali washing, water-soluble cleaning agent, chlorine solvent blasting, shot peening and other methods to clean;

2. Clean the stainless steel elbow, generally do not use acid pickling method to clean.

The electrode should be kept dry when it is used. The titanium calcium type should be dried at 150 ° C for 1 hour, and the low hydrogen type should be dried at 200-250 ° C for 1 hour.

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. The post-weld hardenability is large and cracks are likely to occur. If welding of the same type of welding rod is used, preheating at 300 °C or higher and slow cooling at around 700 °C after welding must be performed. If the weldment cannot be post-weld heat treated, a chrome-nickel stainless steel electrode should be used.

Correct cleaning of stainless steel elbows can improve the safety of their use and extend their life cycle.