Usually, different technical conditions should be proposed for the allowable deviation of steel pipe size, surface quality, chemical composition, mechanical properties, process performance, and other special properties based on the purpose and working conditions of the steel pipe.

When seamless steel pipes are used for transporting various fluids such as water, gas, oil, and manufacturing various structural parts, sampling tests should be conducted on their mechanical properties such as tensile strength, yield strength, and elongation. Delivery pipes generally operate under pressure conditions and require hydraulic tests, as well as process performance tests such as expanding, flattening, and curling. The requirements for carbon equivalent, welding performance, low temperature impact toughness, stress corrosion under harsh corrosion conditions, Corrosion fatigue and strength under corrosive environment are increased for steel pipes used for large long-distance crude oil, product oil and natural gas pipelines.

Ordinary boiler tubes are used to manufacture Superheated steam tubes and boiling water tubes for boilers of various structures; High pressure boiler pipes are used for Superheated steam pipes, heat exchangers of high pressure boilers and pipes for high pressure equipment. The steel pipes used for the above thermal equipment are all working under different high-temperature and high-pressure conditions, and good Surface states, mechanical properties and process properties shall be ensured. Generally, it is necessary to inspect its mechanical properties, conduct flattening and water pressure tests, and high-pressure boiler pipes also require grain size inspection and more rigorous non-destructive testing.

Mechanical seamless steel pipes must have high dimensional accuracy, good mechanical properties and Surface states according to the application requirements. For example, bearing tubes require high wear resistance, uniform organization, and strict inner and outer diameter tolerances. In addition to conducting general mechanical property inspection items, tests should also be conducted on macrostructure, fracture surface, annealing structure (spheroidized structure, network structure, strip structure), non-metallic inclusions (oxides, sulfides, dots, etc.), decarburization layer and its hardness indicators.

High pressure seamless steel pipes used in fertilizer industry usually transport chemical media (such as synthetic ammonia, methanol, urea, etc.) under a corrosive environment with a pressure of 2200~3200MPa, a working temperature of -0~400~C, so in addition to high pressure resistance, they should also have strong corrosion resistance, good Surface states and mechanical properties. In addition to conducting mechanical properties, flattening, and water pressure tests, corresponding intergranular corrosion tests, grain size tests, and more rigorous non-destructive testing should be conducted according to different steel grades.

Steel pipes used for petroleum and geological drilling work in harsh environments with high pressure, alternating stress, and corrosiveness, so they should have high strength levels and have properties such as wear resistance, torsion resistance, and corrosion resistance. According to different steel grades, tests should be conducted on tensile strength, yield strength, elongation, impact toughness, and hardness. For casing, tubing, and drill pipes used in oil wells, detailed steel grades, categories, and additional technical conditions suitable for different environments and geological conditions are selected by users to meet different special needs.

In addition to conducting mechanical and hydraulic tests, various stainless, heat-resistant, and acid resistant pipes used in the chemical, petroleum cracking, aviation, and other mechanical industries also need to undergo specialized intergranular corrosion tests, flattening, flaring, and non-destructive testing.