Under our actual investigation， Fangguan has a brand-new development
4High temperature diffusion heat treatment of ingot can improve the composition heterogeneity of ingot and improve the transverse performance of square tube.
hFor gas transmission: gas
Under our actual investigation， steam and liquefied petroleum gas.
Square pipe is a square steel pipe cold drawn from seamless steel pipe， which is not a straight qb square pipe， and qb square pipe， also known as welded pipe，方矩管 is a square pipe welded by steel plate or strip steel after crimping. Qb square tube has the advantages of simple production process，1 galvanized square pipeHow to improve performance high production efficiency， many varieties and specifications and less equipment. The commonly used materials are QA and QC.
VTributeIn order to ensure excellent coating quality， the coating is required to be firmly attached to the surface of the coated object. This depends on the quality of the coating itself; On the other hand， it depends on the quality of the coated surface treatment before construction. After various surface treatments， the coating quality and economic effect are very different.
CoHow to specify the yield point of square tube: if the stress decreases， the upper and lower yield points shall be distinguished. The unit of yield point is nmm (MPA). & upper yield point
The iron filings and burrs on the cutting section shall be completely removed with a file or appropriate tools to prevent the iron filings and burrs from scratching the rubber O-ring and other accessories when connecting another part.
Among them， qb square tube is divided into 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 are divided by weld & mdash& mdash; Straight seam welded square pipe， spiral welded square pipe.
oThe disadvantage of solid bending is that it has tensile thinning effect. The actual bending will produce tension at the bending point，方矩管 and the tensile effect will shorten the longitudinal length of the bending line; The metal at the real bend will become thinner due to stretching.
AA fixed thickness oxide film is formed， showing a variety of different colors. Chemical oxidation method is to form various film colors in a specific solution at temperature and time; Because of the law & rdquo; More， but to maintain the color of the product， the reference electrode must be used. Electrochemical method is to form the color of chloride film with fixed thickness in specific electrolyte at temperature voltage and time. This process is mature and widely used. Ion implantation method is to vaporize ions in vacuum and deposit them on the surface of qb square tube， such as watch case on the market. The golden color of watch strap adopts this process technology， which is suitable for mass production. The process of gas phase cracking is more complex and less used in industry. Square tube has long been widely used in mechanical industry. When the square pipe is cut automatically， when the square pipe is hoisted to the gas cutting platform， the distance difference between the two ends of one side of the pipe and the guide rail shall be adjusted within mm. During semi-automatic cutting， the guide rail shall be placed on the plane of the cut pipe， and then the cutting machine shall be placed on the guide rail gently.
IClick to viewPreheating must be carried out before heat treatment of qb square tube，方矩管 so as to better ensure that there will be no many problems in the whole heat treatment process of qb square tube， and the quality of qb square tube will also be well guaranteed.
qCCommon specifications of square tube: ~ & times; × .～ × × .～ × × .～ × × .～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～ × × ～
There are many forms of heating furnace，1 galvanized square pipeHow to improve performance which can rotate slowly， the blank is loaded along the diameter direction of the furnace bottom from the inlet， and can be heated and homogenized to the specified temperature when it is used at the outlet. The production process of seamless square tube is relatively slow， and the heating operation especially needs patience. Because if the heating operation is not standardized， cracks， folding and eccentricity on the inner or outer surface of the tube blank will only produce waste products and defective products.
Now， with the continuous development of qb square tube， its use is becoming more and more extensive，方管,方矩管,无缝方管,镀锌方管,镀锌管-无锡嘉航金属制品有限公司 and the technology is also following up. Therefore， we still look forward to the development of qb square tube in the future.
originaldStainless steel qb square pipe for mechanical structure， Standard No.: gbt-. Representative material Cr cr crni CrNi crninb， etc. It is mainly used for machinery， automobile， bicycle， furniture， hotel and restaurant decoration and other mechanical parts and structural parts.
PB. tool steel: (a) carbon tool steel; (b) Alloy tool steel; (c) High speed tool steel.
The qb square tube protective layer thickness detector is used to measure the actual thickness of the seamless qb square tube protective layer on site. It is required that the actual thickness of the seamless qb square tube protective layer of the seamless qb square tube shall not be lower than the design value. When the requirements are not met， the protective layer of seamless qb square tube can be chiseled and measured.
wAfter perforation， the round tube blank is successively rolled by cross rolling， continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing， the steel pipe enters the cooling tower for water spray cooling. After cooling， the steel pipe is sent to the gold pipe by belt
gZAvoid contact with pollutants such as oil and copper when storing square tubes.
The first is the influence of external conditions. It mainly depends on the medium characteristics and temperature around the square pipe and whether the medium around the pipe is corrosive. Because the corrosivity of the medium is closely related to the microorganisms contained in the soil. And if it is a long-distance pipeline， the soil environmental properties are more complex. In addition， the temperature of the environment where the pipeline is located will also affect the corrosion of the square pipe. If the temperature is high， the corrosion speed will also be accelerated， while if the temperature is low