Essential Information

Seamless steel pipes are divided into two categories: hot rolled and cold rolled (dial) seamless steel pipes.

Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, rust steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.

In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, rust thin-wall steel pipe, special-shaped steel pipe.

The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the outer diameter of the cold-rolled seamless steel pipe can be mm, the wall thickness can be 0.25mm, the outer diameter of the thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, and the precision of the cold-rolled inch is higher than that of the hot-rolled inch.

Generally used seamless steel pipe is made of 10#, 20#, 30#, 35#, 45# and other high-quality carbon bonded steel 16Mn, 5MnV low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other bonded steel hot rolled or cold rolled.

Seamless pipes made of low carbon steel such as 10# and 20# are mainly used for fluid transportation pipelines.

45, 40Cr and other carbon made of seamless pipe to manufacture mechanical parts, such as cars, tractor parts.

Generally use seamless steel pipe to ensure the strength and flattening test.

Hot rolled steel pipe in hot rolled or heat treatment condition: cold rolled in heat treatment condition delivery.

Hot-rolled seamless steel pipe, as the name suggests, the temperature of the rolled part is high, so the deformation resistance is small, and the shape quantity can be achieved.

Taking the rolling of steel plates as an example, the thickness of continuous casting billets is generally about 230mm, and after rough rolling and finishing, the final thickness is 1~20mm.

At the same time, due to the small width to thickness ratio of the steel plate, the dimensional accuracy requirements are relatively low, and the plate shape problem is not easy to occur, and the convexity is mainly controlled.

For the requirements of the organization, it is generally achieved by controlling the rolling and cooling, that is, controlling the rolling temperature, final rolling temperature and crimping temperature of the finishing rolling to control the microstructure and mechanical properties of the strip steel.

Seamless steel pipes are divided into two categories: hot rolled and cold rolled (dial) seamless steel pipes.

Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.

In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe.

The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the outer diameter of the cold-rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of the thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe.

Generally used seamless steel pipe is made of 10#, 20#, 30#, 35#, 45# and other high-quality carbon bonded steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other bonded steel hot rolled or cold rolled.

Seamless pipes made of low carbon steel such as 10# and 20# are mainly used for fluid transportation pipelines.

45, 40Cr and other medium carbon steel seamless pipe to manufacture mechanical parts, such as cars, tractor parts.

Generally use seamless steel pipe to ensure the strength and flattening test.

Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition;

Delivered cold rolled in heat-treated condition.

Hot-rolled seamless steel pipe, as the name suggests, the temperature of the rolled part is high, so the deformation resistance is small, and the deformation amount can be achieved.

Taking the rolling of steel plates as an example, the thickness of continuous casting billets is generally about 230mm, and after rough rolling and finishing rolling, the final thickness is 1~20mm.

At the same time, due to the small width to thickness ratio of the steel plate, the dimensional accuracy requirements are relatively low, and the plate shape problem is not easy to occur, and the convexity is mainly controlled.

For the requirements of the organization, it is generally achieved by controlling the rolling and cooling, that is, controlling the opening rolling temperature, final rolling temperature and crimping temperature of the finishing rolling to control the microstructure and mechanical properties of the strip steel.