Tubes for steel fabrication - carbon steel tubes

Carbon steel tubes are made of ingot or solid round steel that is perforated into wool tubes and then hot rolled, cold rolled or cold drawn. Carbon steel pipe plays an important role in our steel pipe industry.

Carbon steel pipes are divided into hot rolled and cold rolled (drawn) steel pipes.

Hot rolled carbon 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 pipe.

Cold rolled (dial) carbon steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless steel pipe can be up to 6mm, and the wall thickness can be up to 0.25mm. The outer diameter of thin-walled pipe can be up to 5mm, and the wall thickness is less than 0.25mm.

General carbon steel pipe: is made of 10, 20, 30, 35, 45 and other high-quality carbon junction steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled. 10, 20 low carbon steel manufacturing seamless pipe is mainly used for fluid conveying pipe. 45, 40Cr and other medium carbon steel seamless pipe to manufacture mechanical parts, such as cars, tractor parts. Generally use carbon steel pipe to ensure the strength and flattening test. Delivery of hot-rolled steel pipes in hot-rolled or heat-treated condition; Cold rolled and delivered in heat-treated condition.

Carbon steel pipe or colloquially known as carbon steel pipe is made of steel ingot or solid tube billet perforated into wool tube and then hot rolled, cold rolled or cold drawn. Carbon steel pipe plays an important role in our steel pipe industry.

According to incomplete statistics, existing carbon steel tube manufacturers in our country about more than 240 enterprises, carbon steel tube units about more than 250 sets, annual capacity about more than 4.5 million tons. From the caliber, < φ76, accounting for 35%, < φ159-650, 25%. From the variety, general purpose pipe 1.9 million tons, accounting for 54%; Oil pipeline 760,000 tons, accounting for 5.7%; Hydraulic prop and precision pipe 150,000 tons, accounting for 4.3%; Stainless pipe, bearing pipe, automobile pipe a total of 50,000 tons, accounting for 1.4%.

The raw material of carbon steel tube is round tube billet, round tube embryo to be cut by cutting machine processing billet with growth of about 1 meter, and sent to the furnace by conveyor belt heating. The billet is fed into a furnace and heated to about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is the key problem. After the round tube billet comes out, it is perforated by the pressure punch. Generally, the most common perforator is the conical roll perforator. This kind of perforator has high production efficiency, good product quality, large perforating diameter and can wear a variety of steel. After perforation, the round tube billet is successively rolled by three high diagonal, continuous rolling or extrusion. After extrusion, the pipe should be removed for sizing. The caliper rotates into the steel embryo through a conical drill at high speed to punch holes and form steel pipes. The inner diameter of the steel pipe is determined by the outer diameter length of the caliper drill bit. After sizing the steel pipe, it enters the cooling tower and is cooled by spraying water. After cooling the steel pipe, it will be straightened. After straightening, the steel pipe is sent by conveyor belt to the metal inspection machine (or hydraulic test) for internal inspection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. Steel pipe quality inspection after the strict hand selection. After the steel pipe is inspected, the number, specification and production lot number are sprayed with paint. And by the crane into the warehouse.

Specifications: carbon steel pipe specifications with outer diameter * wall thickness millimeters.