Line pipe: oil, gas or water extracted from the ground is transported to oil and gas industry enterprises through line pipe. Line pipe includes seamless pipe and welded pipe. Its pipe end has flat end, threaded end and socket end. Its connection mode is end welding, coupling connection, socket connection, etc.

Line pipe is a pipeline used mainly in the oil and gas industry for pumping oil, gas and water out of the ground and transporting it. The pipe end of the line pipe has a flat end, a threaded end and a beveled end, and its connection mode is end welding, coupling connection, socket connection, etc.

classification of line pipe:

[1] low temperature tempering (150-250 degrees)

The microstructure obtained by low temperature tempering is tempered martensite. Its purpose is to maintain the high hardness and high wear resistance of hardened steel under the premise of reducing its quenching internal stress and brittleness, so as to avoid cracking or premature damage during use. It is mainly used for all kinds of high carbon cutting tools, measuring tools, GB/T9711.1 pipeline steel pipe, rolling bearings and carburizing parts, etc., after tempering hardness is generally HRC58-64.

[2] medium temperature tempering (250-500 degrees)

The tissue obtained by medium temperature tempering is tempered diostite. The aim is to obtain high yield strength, elastic limit and high toughness. Therefore, it is mainly used for the treatment of various GB/T9711.1 pipeline steel pipes and hot work molds, and the hardness after tempering is generally HRC35-50.

[3] high temperature tempering (500-650 degrees)

The structure obtained by high temperature tempering is tempered sothosome. Traditionally, the heat treatment combined with quenching and tempering is called quenching and tempering, and its purpose is to obtain better comprehensive mechanical properties of strength, hardness, plasticity and toughness. Therefore, it is widely used in automobiles, GB/T9711.1 pipeline steel pipes, machine tools and other important structural parts, such as connecting rods, bolts, gears and shafts. Hardness after tempering is generally HB200-330.