The production process of cold drawn seamless steel pipe is the same as that of ordinary seamless pipe, which is the subsequent pickling and cold rolling process. Tube blank-inspection-peeling-inspection-heating-piercing-pickling passivation-grinding-smooth and dry-cold rolling-degreasing-cutting the beginning-inspection-marking-product packaging.
The main feature of seamless steel pipe is that it has no welded joints and can withstand great pressure. The product can be very rough castings or cold drawn parts. Cold drawn seamless steel pipe is a product that has appeared in recent years, mainly because the inner hole and outer wall have strict service and roughness.
The alloying elements in cold drawn seamless steel tubes have a greater impact on the low temperature temper brittleness. Chromium and manganese promote the segregation of impurity elements such as phosphorus in the austenite grain boundaries, and then promote low-temperature tempering brittleness. Tungsten and vanadium have no effect at all. Molybdenum reduces the resistance to brittleness transition temperature of low-temperature tempered cold drawn seamless steel pipes, but It is not enough to suppress low temperature temper brittleness. Silicon can delay the separation of cementite during tempering and increase its formation temperature, so it can increase the temperature at which cold-drawn seamless steel pipe low-temperature temper brittleness occurs.
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