What are the classification of seamless steel pipes

What are the classification of seamless steel pipes

What are the classification of seamless Steel Pipes

Seamless steel pipes are divided into hot-rolled and cold-rolled, and cold-drawn seamless steel pipes in three categories. 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 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 steel pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the 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. Cold rolling has higher dimensional accuracy than hot rolling, and cold-drawn seamless steel pipes are generally used to manufacture mechanical parts

The steel used in seamless steel pipes is 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 made of hot or cold rolling. Seamless pipes made of low carbon steel such as No. 10 and No. 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. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Cold-rolled delivery in cold-rolled or heat-treated condition.

Low and medium pressure boiler with seamless steel pipe: used to manufacture a variety of low and medium pressure boiler, superheated steam pipe, boiling water pipe, water wall pipe and locomotive boiler with superheated steam pipe, smoke pipe, small smoke pipe and arch brick pipe, etc., with high-quality carbon structural steel hot rolled or cold rolled (dial) seamless steel pipe, mainly with 10, 20 high-quality carbon structural steel manufacturing.

High pressure boiler seamless steel pipe: mainly used to manufacture high pressure and above the pressure of steam boiler pipes and other high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipe, these boiler tubes often work under high temperature and high pressure, the pipe under the action of high temperature smoke and water vapor will occur oxidation and corrosion.
Seamless steel pipe for geological drilling and oil drilling: To explore the structure of underground rock formations, groundwater, oil, natural gas and mineral resources, the use of drilling RIGS. Oil and natural gas mining is inseparable from drilling, seamless steel pipe for oil drilling is the main equipment for drilling, mainly including core outer pipe, core inner pipe, casing, drill pipe and so on. Drilling pipe to the depth of several thousand meters, the working conditions are extremely complex, requiring the pipe must have sufficient strength, hardness, wear resistance and impact toughness. Steel for steel pipes is represented by "DZ" (the Chinese pinyin prefix for geology) plus the number one to represent the steel yield point.

There are many kinds of oil pipes, one of which is the oil cracking pipe, which is used in the furnace pipe, heat exchanger pipe and pipe seamless pipe for the oil refinery. Commonly used high-quality carbon steel, alloy steel, heat-resistant steel and stainless steel manufacturing. In addition to chemical composition and various mechanical properties, steel pipes also need to ensure water pressure, flattening, flaring and other tests, as well as surface quality and non-destructive testing. Steel pipes are delivered under heat treatment.

The other is stainless steel pipe, made of various stainless steel, widely used in petroleum, chemical equipment pipelines and stainless steel structural parts for various purposes. The steel pipe subjected to fluid pressure must be qualified in the hydraulic test. All kinds of special steel pipes should be guaranteed according to the specified conditions.

There is also A high pressure oil pipe for diesel engine, using 20# carbon steel as the material, made of cold drawing, according to dimensional accuracy can be divided into A, B, C, and D four levels. Class A is used for general diesel engines and maintenance accessories, Class B is used for high-precision diesel engines, class C is used for diesel fuel injection pump test bench, and class D is for special requirements.
Finally, precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders are made of No. 10, No. 20, No. 35 and No. 45 steel and are cold-rolled or cold-drawn. The surface roughness grades of the tube are f (cold-drawn tube) and e (cold-rolled tube). The steel pipe has the characteristics of high dimensional accuracy, smooth surface, low roughness and good surface quality, and can be made into cylinder with high precision and good coordination with piston.

This is some common types of seamless steel pipe, you have any ideas or questions, you can contact us.