Nickel is a very important core element of high-temperature-resistant stainless steel pipes. It can improve the strength and toughness of steel. High-temperature-resistant stainless steel pipes increase the high content of steel, which can significantly change the physical properties of steel and alloys and improve the corrosion resistance of steel.
Manganese can increase the strength of steel, weaken and eliminate the harmful effects of sulfur, and can improve the hardenability of steel. High-manganese steel has good wear resistance and other physical properties performance.
Measures to prevent thermal cracks during welding of high-temperature stainless steel pipes include:
Reasonably design the joint form and weld layout, pay attention to the welding sequence, and reduce joint stiffness and welding stress.
Control the chemical composition of the weld to ensure a dual-phase structure in high-temperature stainless steel pipes.
Adding elements such as vanadium, titanium and aluminum to the weld that refine the grains to prevent segregation and cracking, and adding elements such as molybdenum and tungsten that reduce the ability of atoms to diffuse and thus reduce the tendency of hot cracking, will be harmful ingredients are limited to a very minimum.
Use low hydrogen process to keep it clean. High-temperature resistant stainless steel pipes are welded to small specifications, that is, low current, fast welding and linear transportation, keeping the heat input small, improving the heat dissipation conditions of the weld, and speeding up the cooling speed of the weld. The temperature between control layers does not exceed 150°C. High temperature resistant stainless steel pipes are usually not preheated, and cold welding wire can be added to the molten pool to accelerate cooling to reduce segregation and refine the grains to prevent thermal cracking. When welding high-temperature stainless steel pipes, the arc should be closed slowly and the arc crater should be filled.

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