Qb square tube， qb square tube， qb square tube， QB square tube， QB square tube and hot-rolled right angle square tube are of good quality and excellent quality. We have become a supplier of many enterprises. Qb square tube and I-beam are two products with different shapes. Under the condition of the same material， the bearing capacity of steel is the same， and I-beam is in I-shape. The purpose is different. I-beam can be used as span and support. Square pipe is a little worse than span. It is no problem to do support. However， the specific selection of steel depends on the requirements of the project. Square tube practical application square tube for structure (gbt-) is a square tube for general structure and mechanical structure.
Section shape classification of large-diameter qb square tube square tube is classified according to section shape: simple section square tube & mdash& mdash; Square tube， rectangular tube and complex section square tube & mdash& mdash; Flower shaped square pipe， open square pipe， corrugated square pipe， special-shaped square pipe， large-diameter qb square pipe surface treatment classification square pipe is divided according to surface treatment: hot-dip galvanized square pipe， electro galvanized square pipe， oil coated square pipe， acid pickling square pipe， large-diameter qb square pipe purpose classification square pipe is classified according to purpose & mdash& mdash; Square tubes for decoration， machine tool equipment， machinery industry， chemical industry， steel structure， shipbuilding automobile， special purpose steel beam and column， large-diameter qb square tube wall thickness classification， large-diameter qb square tube according to wall thickness Classification & mdash& mdash; Super large diameter qb square pipe large diameter qb square pipe and thin-wall large diameter qb square pipe rectangular pipe are the names of square pipe and QB square pipe， that is， steel pipe with equal side length. It is made of rolled strip steel after process treatment. Generally， the strip steel is unpacked， leveled crimped and welded to form a round pipe， then rolled into a square pipe from the round pipe， and then cut into the required length. Usually pieces per bag. Qb square pipe， also known as square and rectangular cold-formed hollow section steel， is referred to as square pipe and rectangular pipe， code f and j respectively. The allowable deviation of wall thickness of qb square pipe shall not exceed plus or minus % of nominal wall thickness when the wall thickness is not greater than mm， plus or minus % of wall thickness when the wall thickness is greater than mm， except for the wall thickness of corner and welding joint area.
SarovaFunction index analysis of square tube - the strength acts on the parts in a great progress. The load on the parts is called the charge and trap load. The power of square tube destruction under the charge and trap load is called the charge and trap toughness.
The strength， plasticity and angle discussed later are the machine function indicators of metal under static load. In practice， many mechanical machines are under repeated load， and the whole opportunity is tired in this environment.
PaybackCold drawn or cold rolled precision square tube (gb-) is a cold drawn or cold rolled precision square tube with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The selection of precision square mechanical structure or hydraulic equipment can greatly save machining hours， improve material rate and improve product quality.
Cleaning solvent and emulsion can clean the surface of square tube to remove oil， grease， dust， agent and similar organic matter， but it can not remove rust scale， welding， etc. on the surface of square tube， so it is only used as an auxiliary means in production.
Generally speaking， square pipe welding has a process: ignition， also known as non-ferrous metals refer to metals and alloys other than ferrous metals， such as copper， tin， lead， zinc， aluminum， brass， bronze， aluminum alloy and bearing alloy. In addition， chromium， nickel， cobalt square tube， vanadium， tungsten， titanium， etc. are also used in industry. These metals are mainly used as alloy additives to improve the performance of metals. Tungsten， square tube titanium， molybdenum， etc. are mostly used to produce cemented carbide for tools. The above non-ferrous metals are called industrial metals. In addition， there are precious metals: platinum， gold， silver and rare metals， including radioactive square tubes.
Upper yield point (& sigma; Su): the large stress before the yield of the sample occurs and the stress decreases for the first time; Lower yield point (& sigma; SL): the small stress in the yield stage when the initial instantaneous effect is not considered.
The difference between hot-dip galvanized square pipe and cold-dip galvanized square pipe is mainly from the following aspects: the appearance of hot-dip galvanized square pipe is slightly rough compared with cold-dip galvanized square pipe; The appearance of cold galvanized square pipe is smooth and bright.
Production departmentComprehensive classification ordinary steel A. carbon structural steel: (a) Q (b) Q (b); (c) Q( C)； (d) Q( B)； (e) Q.
QB square tube is a product appeared in recent years which mainly has strict tolerance and roughness for the dimensions of inner hole and outer wall. Production process classification of large-diameter qb square tube large-diameter qb square tube is divided into hot-rolled seamless square tube， cold drawn seamless square tube， seamless square tube and qb square tube according to production process. Among them， qb square tube is divided into: (a) by process & mdash& mdash; Arc welded square pipe， resistance welded square pipe (high frequency and low frequency)， gas welded square pipe and furnace welded square pipe (b) are divided by weld & mdash& mdash; Material classification of straight seam welded square pipe and spiral welded square pipe large diameter qb square pipe: plain carbon steel square pipe and low alloy square pipe. Ordinary carbon steel is divided into Q Q q SS， # steel， # steel， etc; Low alloy steels are divided into q Mn， Q， St-， etc.
The characteristics of square pipe are as follows: the production process of square pipe is simple， the production efficiency is high， and square pipe with different pipe diameter with blank of the same width. However， compared with straight seam pipe of the same length， the weld length is increased by ~， which will be oriented to the whole country for a long time Individuals and enterprises provide all kinds of square tubes， square rectangular tubes， galvanized square tubes， galvanized tubes， on-site settlement， honest operation， local offices， long-term cooperation， and low production speed. Therefore， most of the smaller square tubes adopt straight seam welding， and most of the large-diameter square tubes adopt spiral welding.
Carbon steel classified by chemical composition: square tube A. low carbon steel (C & le; .%); b. Medium carbon steel (C & le; . ~ .%); c. High carbon steel (C & le; .%).
Quotation sheetPut the pig iron for steelmaking into the steelmaking furnace according to the specified process to obtain steel. The products of steel include ingots， continuous casting billets and various steel castings made of straight square tubes. Generally speaking，SarovaQuotation of 80 galvanized square pipe， steel refers to the steel rolled into various square tubes. Square tube steel belongs to ferrous metal， but steel is not completely equal to ferrous metal.
Classification of wall thickness square tubes are divided into super square tubes， square tubes and thin-walled square tubes according to wall thickness. Gbt-gbt-gbt-， JG -， ASTM A， JIS gen or technical agreement.
In this period， the technology of continuous rolling pipe was not mature.
SarovaSolution treatment and nondestructive testing sand rolling treatment and sand blasting treatment many manufacturers in the market do not do solution treatment and % penetration nondestructive testing，Sarova316L stainless steel square pipe， and many of them use sand blasting instead of sand rolling. After these steps are omitted， the cost is greatly reduced.
With the progress of the times and the faster and faster economic development， the places where large-diameter seamless square tubes are used are becoming more and more popular
， cold drawn tubes， tubes， etc. Hot rolled seamless tubes are produced on the automatic precision tube precision tube rolling mill. The solid tube blank is cut into the required length by removing surface defects， centering on the end face of the perforated end of the tube blank， and then sent to the heating furnace for heating. It is perforated on the piercing machine. At the same time， it rotates and advances continuously under the action of roll and plug， which is called the rough pipe， and then sent to the automatic pipe mill for continuous rolling. After the wall thickness is adjusted by the whole machine， and the diameter is determined by the sizing machine to meet the specification requirements. The continuous pipe mill is more advanced in producing hot-rolled seamless steel pipe. If you want to obtain seamless pipe with smaller size and better quality， Cold rolling and cold drawing must be adopted， or the combination of cold rolling and cold drawing is usually carried out on the roll mill. The seamless pipe is rolled in the annular pass composed of variable section circular hole groove and fixed conical plug. Cold drawing is usually carried out on the single chain or double chain cold drawing machine， that is， the heated pipe blank is placed in a closed cylinder， and the perforated rod and rod move， This method can produce steel pipe with small diameter. In the building materials industry， the development of various pipes is different. Because of their different characteristics，SarovaHot dip galvanized square pipe Market， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. We need to understand the various characteristics of steel pipes. However， in the building materials industry， the development of various pipes is different. Because of their different characteristics， there is a certain distance between pipes. Square pipe is one of many pipes in the building materials industry. It is formed after strip steel treatment. The various characteristics of steel pipe need to be understood by everyone. However， due to the of steel pipe and other raw materials