Steel pipe is a hollow, a large number for a pipe conveying fluid, such as oil, gas, water, gas, steam, etc., engaged in bending, torsional strength, lighter weight, so it is widely used in the manufacture of mechanical parts and engineering structures.
Types of steel pipe: steel tube can be divided into sub-seamless and welded steel pipe (seam tube) two categories. The cross sectional shape can be divided into the tube and shaped tube, widely used is a circular steel pipe, but there are also some square, rectangular, semi-circular, hexagonal, triangle, octagonal shaped steel tubing.crimping trial to withstand the fluid pressure steel pipe should be carried out hydraulic pressure test to test pressure capacity and quality, and leak under pressure, wet or expansion of qualified, some steel pipes are also requirements based on standards or demand side flaring test, flattening test.
Seamless steel pipe: seamless steel pipe uses perforation made steel ingot or solid tube capillary, and then dial made by the hot-rolled, cold rolled or cold drawn. The specifications of the seamless steel pipe outside diameter * thickness in millimeters. Seamless steel pipe is divided into hot-rolled and cold-rolled (reversal of) two types of seamless steel pipe.
Hot-rolled is divided into general steel pipe, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipe, stainless steel, petroleum cracking tubes, geological steel pipe and other pipe and so on.
Cold-drawn seamless steel pipe in addition to the points (reversal) general steel pipes, low and medium pressure boiler pipe, high-pressure boiler steel pipes, alloy steel pipe, stainless steel, petroleum cracking tubes, other steel pipes, carbon steel tubes, alloy steel tubes stainless steel tubes and shaped steel tubes.
Welded steel pipe welding process is divided into the stove pipe welding (resistance welding) pipe and automatic arc welded pipe, its welding form is divided into a straight seam welded pipe and spiral welded pipe in two, the end is divided into round shaped pipe and shaped (square, flat, etc.) pipe because of the shape.