Stainless steel electrodes can be divided into chrome stainless steel electrodes and chromium nickel stainless steel electrodes. Chrome stainless steel has certain corrosion resistance (oxidizing acid, organic acid, cavitation), heat resistance and wear resistance. Usually selected as materials for power plants, chemicals, petroleum and other equipment. However, the weldability of chromium stainless steel is relatively poor, we should pay attention to the welding process, heat treatment conditions and select the appropriate electrode.
(1). Chromium 13 stainless steel: this kind of chromium steel is hardened after welding and is prone to cracks. If the same type of chromium stainless steel electrode (E410-16, E410-15) is used for welding, a pre-temperature of 300 degrees Celsius or more must be performed Tempering and slow cooling around 700 degrees Celsius after heat and welding. If the weldment cannot be processed after welding, the chromium-nickel stainless steel electrode (E308-15, E316-15) should be used.
(2). Chromium 17 stainless steel: This kind of chromium steel is usually added with appropriate amount of stability elements titanium, niobium, molybdenum, etc. to improve corrosion resistance and weldability. The welding performance is better than chromium 13 stainless steel. The same type of chromium stainless steel electrode (E430-16, E430-15) can be used. Before welding, preheating at about 200 degrees Celsius should be performed, and after welding, tempering treatment at about 800 degrees Celsius should be performed. Can also use chromium-nickel stainless steel electrode (E308-15, E316-15), no heat treatment after welding.