The chrome stainless steel electrode is a kind of stainless steel electrode with certain corrosion resistance (oxidative acid, organic acid, cavitation) heat resistance and corrosion resistance. Usually selected as power plant, chemical, petroleum and other equipment materials. However, the chrome stainless steel generally has poor weldability, and attention should be paid to the welding process, heat treatment conditions and selection of suitable welding electrodes.
1. Welding of martensitic stainless steel:
Martensitic stainless steels include medium chromium steels containing 5 to 9% chromium and high chromium steels containing 12% chromium. Such steels have a high tendency to harden, and martensite and bainite which are prone to high hardness after welding increase brittleness, and have large residual stresses, which are prone to cold cracks. Therefore, preheating and interlayer insulation must be carried out before welding, and high temperature tempering is performed before welding.
2. Welding of chrome 13 stainless steel:
Such chrome steel has high hardenability after welding and is prone to cracking. If welding of the same type of chrome stainless steel electrode (CHK202, CHK207) is used, preheating at 300 °C or above and tempering and slow cooling at 700 °C after welding must be performed. If the weldment cannot be post-welded, use a chrome stainless steel electrode (CHS107, CHS207) for welding.
3. Welding of chrome 17 stainless steel:
Such chrome steel is usually added with a proper amount of stabilizing elements such as titanium, tantalum and molybdenum for improving corrosion resistance and weldability. The weldability is better than that of chromium 13 steel, and the same type of chromium stainless steel electrode (CHK302, CHK307) Welding. Before welding, the weldment should be preheated at about 200 °C, and then tempered at about 800 °C after welding. It is also possible to use chrome-nickel stainless steel electrodes (such as CHS107, CHS207) without heat treatment after welding.
1. Welding of martensitic stainless steel:
Martensitic stainless steels include medium chromium steels containing 5 to 9% chromium and high chromium steels containing 12% chromium. Such steels have a high tendency to harden, and martensite and bainite which are prone to high hardness after welding increase brittleness, and have large residual stresses, which are prone to cold cracks. Therefore, preheating and interlayer insulation must be carried out before welding, and high temperature tempering is performed before welding.
2. Welding of chrome 13 stainless steel:
Such chrome steel has high hardenability after welding and is prone to cracking. If welding of the same type of chrome stainless steel electrode (CHK202, CHK207) is used, preheating at 300 °C or above and tempering and slow cooling at 700 °C after welding must be performed. If the weldment cannot be post-welded, use a chrome stainless steel electrode (CHS107, CHS207) for welding.
3. Welding of chrome 17 stainless steel:
Such chrome steel is usually added with a proper amount of stabilizing elements such as titanium, tantalum and molybdenum for improving corrosion resistance and weldability. The weldability is better than that of chromium 13 steel, and the same type of chromium stainless steel electrode (CHK302, CHK307) Welding. Before welding, the weldment should be preheated at about 200 °C, and then tempered at about 800 °C after welding. It is also possible to use chrome-nickel stainless steel electrodes (such as CHS107, CHS207) without heat treatment after welding.
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