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. Olet of socket welding is a kind of branch pipe table, which is widely used in foreign countries in recent years. Instead of the traditional branch pipe connection types such as reducing tee, reinforcing plate and strengthening pipe section, the spigot branch pipe table has the advantages of safety and reliability, reducing cost, simple construction, improving medium flow channel, series standardization, convenient design and selection, etc., especially in high pressure, high temperature, large diameter and thick wall pipes, it is increasingly widely used to replace the traditional branch pipe connection method. The body of the socket branch pipe table 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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