C. electric furnace steel: (a) electric arc furnace steel; (b) Electroslag furnace steel; (c) Induction furnace steel; (d) Vacuum consumable furnace steel; (e) Electron beam furnace steel.
Pull square tube:
SarovaThe standard number of spiral square pipe (standard of the Ministry of petroleum) for low pressure transmission is syt-. The representative materials are qbqb and other carbon steel materials. It is mainly used for low-pressure transmission of water， oil， heating and other pipelines.
With the improvement of production quality， the quality of square tubes is getting better and better. The quality of square tubes will affect our lives. Because the functions of square tubes are different， their characteristics and uses are different. I will introduce the characteristics and uses of square tubes in detail.
MazetourBrinell hardness (HB)， Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.
Put 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， 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.
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，SarovaQ345B square tube factory， 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，SarovaWhere are galvanized square tubes sold， steel structure shipbuilding， automobile， steel beam and column， special purpose， 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， 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.
Hot dip galvanized square pipe is widely used， mainly in curtain wall， solar power generation support， construction， machinery and steel structure engineering， especially in curtain wall， machinery and construction. The effect of cold galvanized square tube is far from that of hot galvanized square tube; How to distinguish hot galvanized square pipe from cold galvanized square pipe?
The cutting surface of the square tube shall be true circle， and the cutting line shall be at right angles to the axis of the square tube. Excessive force is the reason for cutting the square tube into flat or oval， there is no sign of welding on the surface. Even using advanced flaw detection equipment，SarovaSeamless galvanized square pipe， it can not be seen that they are welded elbows.
Compared with other welding， square pipe welding has many advantages mainly because of the exothermic reaction， the material only needs to be heated below the melting point
B. low alloy structural steel C. ordinary structural steel and high-quality steel for specific purposes (including high-quality steel)
The characteristics of square pipe are as follows: the production process of square pipe is simple， the production efficiency is high， the cost is low and the development is fast. The strength of spiral square pipe is generally higher than that of straight seam square pipe. It can produce square pipe with larger pipe diameter with narrow blank， 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， seamless square tubes， galvanized square tubes， 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.
Finance DepartmentClassification of square pipe material square pipe is divided into ordinary carbon steel square pipe and low alloy square pipe according to material. Ordinary carbon steel is divided into Q Q q SS， # steel， # steel， etc; Low alloy steels are divided into q Mn， Q， St-， etc.
Performance index analysis of square tube - strength refers to the performance of metal materials under static load. Since the action modes of load include tension， compression， bending and shear， the strength is also divided into tensile strength， compressive strength， flexural strength and shear strength. There is often a certain between various strengths. Generally， tensile strength is used as the basic strength indicator.
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， steel beam and column， special purpose， 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.
SarovaSquare tubes for low and medium pressure boilers (gb-) are high-quality carbon structural steel hot-rolled and cold drawn (rolled) square tubes for superheated steam tubes， boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes， large smoke tubes， small smoke tubes and arch brick tubes for locomotive boilers. Square tubes for high-pressure boilers (gb- is a high-quality carbon steel， alloy steel and stainless heat-resistant steel square tube for the heating surface of water tube boilers with high pressure and above. High pressure square tube for chemical fertilizer equipment (GB - is a high-quality carbon structural steel and alloy steel square tube suitable for chemical equipment and pipelines with working temperature of - ~ ℃ and working pressure of ~ mA.
The reason why the surface of fake and shoddy materials is easy to crack is that its blank is adobe with many air holes. During the cooling process， the adobe has cracks due to the action of thermal stress， and there are cracks after rolling.
Hot dip galvanized square pipe is widely used， mainly in curtain wall， solar power generation support， construction， machinery and steel structure engineering， especially in curtain wall， machinery and construction. The effect of cold galvanized square tube is far from that of hot galvanized square tube; How to distinguish hot galvanized square pipe from cold galvanized square pipe?
