ASTM A36 Butt Welding ERW Carbon Steel Seamless Pipe For Liquid

Paremeter

Description

Carbon steel pipes are divided into two categories: hot-rolled and cold-rolled (drawn) steel pipes.Hot-rolled carbon steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes,

cold-rolled (dialed) carbon steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and 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 outer diameter of cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be up to 5mm, the wall thickness is less than 0.25mm, and the dimensional accuracy of cold rolling is higher than that of hot rolling.
General carbon steel pipe: It is made of 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled. Seamless pipes made of 10, 20 and other low carbon steel are mainly used for fluid transportation pipelines. Seamless pipes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Generally, carbon steel pipes should be used to ensure strength and flattening test. Hot rolled steel pipes are delivered in hot rolled state or heat treated state; Cold rolled is delivered in heat-treated condition.

Preparation method

The raw material of carbon steel pipe is round pipe blank, and the round tube preform is cut and processed by the cutting machine to a blank with a length of about 1 meter, and sent to the furnace for heating through the conveyor belt. The billet is fed into a furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue. After the round tube blank is out of the oven, it is pierced by a pressure perforating machine. Generally, the more common perforating machine is the conical roller perforating machine, which has high production efficiency, good product quality, large perforation and diameter expansion, and can penetrate a variety of steel grades. After perforation, the round tube blank is successively obliquely rolled, continuously rolled or extruded by three rolls. After extrusion, it should be de-pipe and sized. The sizing machine rotates into the steel embryo at high speed through a conical drill bit to punch holes to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After the steel pipe is sized, it enters the cooling tower, cooled by water spray, and the steel pipe is straightened after cooling. After straightening, the steel pipe is sent by the conveyor belt to the metal flaw detector (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. After the quality inspection of steel pipes, they must also pass strict manual selection. After the quality inspection of the steel pipe, spray the number, specification, production batch number, etc. with paint. And hoisted into the warehouse by crane.