SSAW steel pipes should be tested for mechanical properties, flattening and flaring before leaving the factory, and should meet the requirements of the specification rules. The quality inspection methods are as follows:

LSAW steel pipe expansion is a pressure processing process that uses hydraulic or mechanical means to apply force from the inner wall of the steel pipe to expand the steel pipe radially outward. The mechanical method is simpler and more efficient than the hydraulic method, and the steel pipe machining is more accurate under the condition of high precision

ERW steel pipe is abbreviated as ERW for straight seam electric resistance welded pipe. It is used to transport oil, natural gas and other vapor-liquid objects. It can meet various requirements of high and low pressure. At present, it occupies a pivotal position in the field of transportation pipes in the world.

Seamless pipe is a building material that will not burn, and it has the characteristics of earthquake resistance and bending resistance. However, after the seamless steel pipe is put into use, there are some unavoidable defects in fire prevention. Its mechanical properties, such as yield point, tensile strength and elastic modulus, will drop sharply due to the addition of temperature.

The large-diameter coated steel pipe is made of plastic-coated large-diameter SSAW steel pipe and ERW steel pipe. The maximum nozzle diameter is 1200mm.

Quenching and tempering refers to a heat treatment process used to improve the comprehensive mechanical properties of seamless steel pipes. That is, after quenching, it is subjected to high temperature tempering treatment. The purpose is to make the seamless steel pipe obtain a good combination of strength and toughness, which not only has high strength, but also has excellent toughness, plasticity, and cutting performance.