Guangdong stainless steel Welding Electrodes can be divided into chromium and chromium-nickel stainless steel welding rod, these two types of electrodes in the country who meet the target, according to the provisions of the national standard GB/T983-1995 assessment.
Chromium-chromium stainless steel electrodes for use with some corrosion (oxidizing acids, organic acids, cavitation) heat and corrosion resistance. Usually selected as power plants, chemical, oil and other equipment and materials. However, under normal circumstances chromium stainless steel weldability is poor, should pay attention to welding, heat treatment conditions and appropriate choice of electrodes.
1, martensitic stainless steels:
Martensitic stainless steel including chromium 5 ~ 9% chromium steel and chromium in 12% of high chromium steel. Tendency of such a large hardened steel after welding is easy to produce high hardness of martensite and bainite that fragility, residual stress is also large, prone to cold cracking. It generally must be preheated before welding and insulation layer, the cooling after welding has not been before tempering.
2, 13 chromium stainless steel welding:
Such hardening of chromium steel after welding large, easy to crack, the use of similar chromium stainless steel electrode (A202, A207) welding, you must be over 300 ℃ 700 ℃ preheating and post-weld tempering about slow cooling process. If the weldment after welding can not be processed, the application of chromium stainless steel electrode (A107, A207), such as welding.
3, 17 chromium stainless steel welding:
Such chromium steel is usually to improve weldability and corrosion resistance and increase the amount of stabilizing elements titanium, niobium, molybdenum, chromium weldability than 13 steel as well, can be the same type of chrome Stainless steel electrodes (A302, A307) welding. Before welding, weldment should be about 200 ℃ preheating, soldering about 800 ℃ after the tempering treatment. Cr-Ni stainless steel electrode also can be used (such as A107, A207), without heat treatment after Tungsten Welding Electrode.
Cr-Ni stainless steel electrode for use
Cr-Ni stainless steel electrode has good corrosion and oxidation resistance, it is widely used in chemical, fertilizer, petroleum, food, medical equipment manufacturing. In recent years, as China's industrial development, chrome-nickel stainless steel electrodes have been over thirty varieties, basically meeting the needs of our construction.