Difference 1: Different appearance

Seamless steel pipes are made of ordinary and high-quality carbon structural steel (q215-a ~ q275-a and 10 ~ 50 steel), low alloy steel (09mnv, 16Mn, etc.), alloy steel, stainless and acid resistant steel, etc;

Welded pipe is made of steel plate or strip steel after crimping and forming.

Difference 2: different raw materials

Seamless steel pipes are made of ordinary and high-quality carbon structural steel (q215-a ~ q275-a and 10 ~ 50 steel), low alloy steel (09mnv, 16Mn, etc.), alloy steel, stainless and acid resistant steel, etc;

Welded pipe is made of steel plate or strip steel after crimping and forming.

Difference 3: different uses

Seamless steel pipe: seamless steel pipe is widely used. Seamless steel pipes for general use are rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for conveying fluids.

Welded pipe: the products are widely used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction. It is one of the 20 key products developed in China. Water supply and drainage. For gas transmission: gas, steam, liquefied petroleum gas. As piling pipe and bridge; Pipes for wharf, road, building structure, etc.

Difference 4: process processing is different

Seamless steel pipes are punched through the center line of round steel, and the internal solid steel becomes hollow round bars. Welded pipes are rolled into steel pipe shapes through steel plates. The welding process is different.

Difference 5: different materials

Seamless steel pipes are punched through the center line of round steel, and the internal solid steel becomes hollow round bars. Welded pipes are rolled into steel pipe shapes through steel plates. The welding process is different,

Difference 6: different physical properties

Seamless steel pipes have better physical properties than welded pipes, such as strength and compression resistance.

Difference 7: different prices

The price of seamless steel pipe is higher than that of welded pipe.