Carbon Steel Pipe

Hot rolled seamless steel pipe:

It is divided into seamless steel pipe for structure, seamless steel pipe for fluid, low and medium pressure boiler pipe, high pressure boiler pipe, alloy pipe, stainless steel pipe, petroleum cracking pipe, geological pipe and other seamless steel pipe, etc.

Cold rolled (drawn) seamless steel pipe:

In addition to seamless steel pipes for the sub-structure, low and medium pressure boiler pipes, high pressure boiler pipes, alloy pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold rolled (drawn) seamless steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel pipes, special-shaped steel pipes. The outer diameter of hot rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of cold rolled seamless steel pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, the cold rolling is higher than the hot rolling size accuracy.

Generally used seamless steel pipe: It 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 alloy steel hot rolling or cold rolling. 10, 20 and other low carbon steel pipe made of seamless steel pipe is mainly used for fluid conveying pipeline. 45#, 40Cr and other medium carbon steel pipe made of seamless steel pipe to manufacture machine parts, such as cars, tractors, force parts. Generally use seamless steel pipe to ensure strength and flattening test. Hot rolled steel pipes are delivered in hot rolled or heat treated state; Cold rolling is delivered in heat treatment condition.

Seamless steel pipe for low and medium pressure boller: Used for manufacturing all kinds of low and medium pressure boiler, superheated steam pipe, boiling water pipe, water wall pipe and superheated steam pipe for locomotive boiler, large smoke pipe, small smoke pipe and arch brick pipe, etc. Hot - rolled or cold - rolled seamless steel pipes with high quality carbon structural steel pipe. Mainly made of 10, 20 steel, in addition to ensure chemical composition and mechanical properties to do hydraulic test, rolling, flaring, flattening and other tests. Hot rolling is delivered in hot rolling state, cold rolling (dialing) is delivered in heat treatment state.

High pressure boiler steel pipe: Mainly used in the manufacture of high pressure and over pressure steam boiler pipes, etc. With high quality carbon structural steel pipe, alloy steel pipe and stainless heat resistant steel seamless steel pipe, these often under high temperature and high pressure boiler pipe, pipe in high temperature flue gas and steam will happen under the action of oxidation and corrosion, so the steel pipe with high rupture strength, high oxidation resistance, And has good organizational stability, In addition to ensuring chemical composition and mechanical properties, high-pressure boiler pipes should be hydrostatic tested root by root, flaring and flattening tests. Steel pipes are delivered in a heat treated state. In addition, the microstructure, grain size and decarbonization layer of the finished steel pipe are also required.

Seamless steel pipe for geological drilling and petroleum drilling:

To explore the underground rock structure, groundwater, oil, natural gas and mineral resources, the use of drilling Wells. Oil and natural gas exploitation is more inseparable from drilling, geological drilling oil drilling seamless steel pipe is the main drilling equipment, mainly including core outer pipe, core inner pipe, casing, drill pipe, etc.. Due to the drilling pipe to go deep into thousands of meters of stratum depth work, the working conditions are extremely complex, drill pipe under tension, pressure, bending, torsion and unbalanced impact load stress, but also by mud, rock wear, therefore, the requirements of pipe must have enough strength, hardness, wear resistance and impact toughness, Steel pipes are delivered in a heat treated state.

Petroleum cracking pipe: Seamless pipe for furnace pipe, heat exchanger pipe and pipeline of petroleum refinery. In addition to obtaining chemical composition and mechanical properties of steel pipes, It is necessary to ensure water pressure, flattening, flaring, surface quality and non destructive inspection. Steel pipes are delivered under heat treatment. Stainless steel pipe: with a variety of stainless steel hot rolled, cold rolled stainless steel pipe, widely used in petroleum, chemical equipment pipelines and various uses of stainless steel structure parts, in addition to should ensure chemical composition and mechanical properties, where used to bear fluid pressure steel pipe to ensure that the hydraulic test qualified. All kinds of special steel pipes should be guaranteed according to the specified conditions.