1, the concept of square tube: Square tube is a steel ingot, billet or square tube through pressure processing into the various shapes, sizes and performance of the material we need.

Square pipe is an essential material for domestic construction and realization of the four modernization, widely used, wide variety, according to the different section shape, square pipe is generally divided into profiles, plates, pipes and metal products four categories, in order to facilitate the organization of the production of square pipe, order supply and do a good job in management.

2, the production method of square pipe

Most of the square tube processing is the square tube through pressure processing, so that the steel (billet, ingot, etc.) to be processed to produce plastic deformation. According to the processing temperature of the square pipe, the square pipe is divided into two kinds of cold processing and hot processing. The main processing methods of square pipe are:

Rolling: The square tube metal billet through a pair of rotating roller gap (various shapes), due to the compression of the roll to reduce the material section, length increase the pressure processing method, this is the production of square tube commonly used production method, mainly used to produce square tube profiles, plates, pipes. Cold rolling, hot rolling.

Forged square tube: A pressure processing method that uses the reciprocating impact force of the forging hammer or the pressure of the press to change the blank into the shape and size we want. Generally divided into free forging and die forging, commonly used for the production of large profiles, billets and other cross section square pipe inch larger materials.

Pulling square tube: It is the processing method that has been rolled metal billet (type, tube, product, etc.) through the die hole to reduce the section and increase the length. Most of it is used for cold processing.

Extrusion: is a processing method in which the square tube places the metal in a closed extrusion tube and exerts pressure at one end to extrude the metal from the specified die hole and obtain the finished product of the same shape and size, which is mostly used in the production of non-ferrous metal square tubes

Ferrous metals, steel and non-ferrous metals Before introducing the classification of steel, briefly introduce the basic concepts of ferrous metals, square steel and non-ferrous metals.

1. Ferrous metals refer to iron and iron alloys. Such as steel, pig iron, ferroalloy, cast iron and so on. Steel and pig iron are based on iron square tubes, with carbon as the main added element of the alloy, collectively referred to as iron-carbon alloy.

Pig iron refers to the product of smelting iron ore into a blast furnace, which is mainly used for steelmaking and square tube manufacturing castings. The cast pig iron is smelted in a cupola to obtain cast iron (liquid), and the liquid cast iron is cast into a cast square pipe, which is called cast iron.

Ferroalloy is an alloy composed of iron and silicon, manganese, chromium, titanium and other elements. Ferroalloy is one of the raw materials for steelmaking. It is used as a deoxidizer and alloying element additive for steel in square tube steelmaking.

2. Put the pig iron for steelmaking into the steelmaking furnace and melt it according to a certain process, that is, steel is obtained. Steel products are ingot, continuous casting billet and straight tube casting into various steel castings. Generally speaking, the steel generally refers to the steel rolled into various square tubes. Square steel is a black metal, but steel is not exactly equal to black metal.

3, square tube non-ferrous metals, also known as non-ferrous metals, refers to metals and alloys other than ferrous metals, such as copper, tin, lead, zinc, aluminum and brass, bronze, aluminum alloy and bearing alloys. In addition, in the industry also used chromium, nickel, manganese, molybdenum, cobalt square tube, vanadium, tungsten, titanium, etc., these metals are mainly used as alloy additives to improve the performance of the metal, including tungsten, square tube titanium, molybdenum, etc., for the production of carbide tools. These non-ferrous metals are called industrial metals, square tubes in addition to precious metals: platinum, gold, silver and rare metals, including radioactive uranium, radium and other square tubes.