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Brinell hardness (HB), and many of them use sand blasting instead of sand rolling. After these steps are omitted, the cost is greatly reduced.NOKIA,In order to ensure the stability of the perforation performance and chemical properties of the billet of the square tube, the technical regulations shall be strictly implemented in the operation of the circular furnace, the operation of the heating furnace shall be frequently, the abnormal conditions shall be handled in time and recorded, and the follow-up posts and quality management department shall be notified in time for handling.Hundreds of degrees Celsius, which can save energy.semey Functional index analysis of qb square tube - commonly used are Brinell angle (HB), Rockwell angle (HRC) and Vickers angle (HV) of qb square tube. Angle is a gauge needle to weigh the soft and hard level of metal data. The angle method is rarely used to determine the internal angle in the current life. It uses the metal data surface tested under the fixed load of the indenter with a certain number and shape to determine its angle value according to the level of the object.Hardness hardness is a pointer to measure the hardness and softness of metal materials. At present, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.Brinell hardness (HB),NOKIANational standard for hot dip galvanized square pipe, Rockwell hardness (HRC) and Vickers hardness (HV) are commonly used.

Generally speaking, square pipe welding has a process: ignition, pressurization and thermal insulation.Tensile strength of square tube (& sigma; b): the stress (& sigma;) obtained by dividing the force (FB) borne by the sample during breaking by the original cross-sectional area (so) of the sample during stretching, which is called tensile strength (& sigma; b), and the unit is nmm (MPA). It represents the large capacity of metal materials under tension.It is the process of drawing the die hole of the rolled metal blank (shape, pipe, product, etc.) into a section to reduce the length and increase. It is mostly used for cold processing.Installation works,It is the process of drawing the die hole of the rolled metal blank (shape, pipe, product, etc.) into a section to reduce the length and increase. It is mostly used for cold processing.Among them,NOKIASpecification of galvanized square pipe, 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; Straight seam welded square pipe, spiral weldingNormalized: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel.

For improper stamping direction, simulation software shall be used in the initial stage of design to ensure that the direction of stamping parts is analyzed, and when the high-quality requirements of components require the re development of molds, the direction shall be adjusted to seamless square tubes. The square tube manufacturer introduces the forming, bending and bending of square tubes. As the name suggests, the bending is compacted, and the inner and outer rollers are double with the inner and outer walls of tube billets during actual bending Compact towards the.Professional is king,Improve the positioning and pre bending steps, if necessary, to ensure that the web hunting problem does not occur when pressing parts. Change the shape of the surface pressure of the material to ensure the quality of the parts and avoid the non movement of the surface shape of the roll gap, resulting in uneven walking feeding.Various treatments are summarized as follows: high temperature oxidation method is to immerse the workpiece in a specific molten salt and maintain a fixed process temperature and timeLarge diameter qb square tube production standard classification square tube is divided according to production standard: national standard square tube Japanese standard square tube, British standard square tube, European standard square tube and non-standard square tube.NOKIA,NOKIAAddress of galvanized square pipe factory,The technology of floating mandrel and square tube is gradually mature.High density may not be obtained by simple pressurization, and insulation shall be carried out at the same time.Hot dip galvanized square pipe is widely used, mainly in curtain wall, 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?