The hardness test of galvanized seamless steel pipe can be divided into two methods, one is tensile test specimen and the other is hardness test.

Following these measures can effectively control the scars of galvanized seamless steel pipes:(1) The particle size of the deoxidizer powder is generally about 16 mesh.(2) According to the inner surface area of the galvanized seamless steel pipe, the spray amount of deoxidizer is generally 1.5-2.0g/dm²...

The relationship between the welding speed of ERW pipes and the quality of the weld is mainly reflected in the heating stage and the crystallization stage.

If the cold treatment method of seamless steel pipe is not correct, it will affect its performance to a certain extent.

The ERW pipe forming roll is an important part of the welded pipe unit and the technical core of the welded pipe forming process. The forming of the ERW pipe needs to go through five basic processes: edge bending-overall bending-closed introduction-extrusion welding-shaping.

The chromatic aberration of galvanized seamless steel pipe is mainly caused by the intense reaction of iron and zinc, which makes the complete coating originally composed of alloy layer and pure zinc layer become only alloy layer without pure zinc layer.