Alloy C-4 is an austenitic nickel-molybdenum-chromium alloy with a low carbon, silicon, and iron content. This alloy has a significantly lower tendency to form precipitation in the temperature range between 650 and 1,040 °C(1,202 - 1,904 °F), improving its resistance to inter-crystalline corrosion. When machined perfectly, no knife line attack occurs in the heat-affected zones of awelding edge. Alloy C-4 is characterized by: Very good resistance in a broad field of corrosive media, in particular under strongly oxidizing conditions. Excellent resistance to pitting, crevice and stress corrosion. The threaded olet is a kind of branch pipe table, which is used for reinforcing the branch pipe connection. Threaded branch pipe table is a kind of branch pipe table, which is widely used in foreign countries in recent years. It is a reinforced pipe fitting for branch pipe connection. Instead of the traditional reducing tee, reinforcing plate, strengthening pipe section and other branch pipe connection types, it has the outstanding advantages of safety and reliability, reducing cost, simple construction, improving medium flow path, series standardization, convenient design and selection. Especially in high pressure, high temperature, large diameter, thick wall pipe used increasingly widely, replacing the traditional branch pipe connection method. The body of the threaded branch pipe is made of high-quality forgings, and the material is the same as that of the pipe, including carbon steel, alloy steel, stainless steel, etc. The branch pipe and main pipe are welded, and the branch pipe table and branch pipe or other pipes (such as short pipe, wire plug, etc.), instruments, valves are connected by butt welding, socket welding, thread and other types.
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