In terms of hot working， repeated upsetting and multi-directional rolling of ingot can not only reduce the level of carbide segregation in square tube， but also improve the anisotropy of steel.
9To change the required line shape of qb square tube， it is necessary to forge the impact force of qb square tube hammer or the pressure of hydraulic press， and can also enhance the malleability of qb square tube， the oil brush work shall be carried out in accordance with the requirements of the rule system，Q345B square tube so as to ensure the oil brush and the oil in the correct position of the brush and avoid wrinkles.
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，Galvanized square pipe manufacturerTreatment of cold drawing defects of which is called tensile strength (& sigma; b)， and the unit is nmm (MPA). It represents the large capacity of metal materials under tension.
TAlemana townPerformance index analysis fatigue of square tube the strength， plasticity and hardness discussed above are the indicators of the mechanical properties of metal under static load. In fact， many machine parts work under cyclic load， under which fatigue will occur.
VsThe welding process of square tube is analyzed. The square tube is produced and processed at room temperature with strip steel as raw material. Square pipe can be divided into straight seam welded pipe， the standards of welded pipes are summarized in turn: galvanized qb square pipe for low-pressure fluid transportation， and the standard number is gbt-. Representative materials: QA， qbqb， etc. It is mainly used for conveying water，Q345B square tube gas， air， oil and heating hot water or steam， and is used for general low pressure fluid.
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.
Square tube flattening test is a kind of test to check the deformation performance of metal tubes (seamless square tubes and rectangular tubes) flattened to the specified size and show their defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards. Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally， sawing is adopted. The inner and outer walls of the pipe shall retain the original surface without any processing. Sample length L & asymp; D (D is the outer diameter of the pipe). When the outer diameter is large， the length l shall not exceed mm. When the outer diameter is less than mm， the surface of the sample shall not be damaged and the performance of the metal shall not be changed due to heating or cold processing. The edge of the section shall be flattened. The flattening test is a test to check the deformation performance of the metal pipe (seamless square pipe and rectangular pipe) flattened to the specified size and show its defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards.
zIf the re inspection results are unqualified (including the items whose preliminary inspection results are unqualified and re inspection is not allowed)， the supplier can submit them for acceptance one by one; Or re conduct heat treatment (the number of RE heat treatment shall not exceed times)， and propose acceptance with a new batch.
FTensile strength: - yield strength: & Ge; elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; mechanical properties of seamless pipe: tensile strength: - yield strength: ≥ elongation: & Ge; square tube belongs to low alloy series. It is one of the materials of seamless steel pipe. In low alloy materials， this material is ordinary. Square tube used to be called QB square tube.
IConvenient and efficientThe qb square tube rolled from the strip steel through process treatment is generally to unpack，Q345B square tube flatten， curl and weld the strip steel to form a round tube，Galvanized square pipe manufacturerTreatment of cold drawing defects of then roll the round tube into a square tube， and then cut it to the required length. Nowadays， the forming of qb square tube has solid bending and empty bending. The bending degree of qb square tube shall not be greater than mm per meter， and the total bending degree shall not be greater than the actual bending of the total length. As the name suggests， the bending is compacted， and the internal and external rollers and the internal and external walls of the tube blank are compacted in both directions during the actual bending.
kKThe surface hardening treatment of qqb square tube is generally isothermal quenching， that is， heat treatment technology. After isothermal quenching，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang qqb square tube will obtain more and better properties， and make qqb square tube be applied in more fields.
The standard quantity of combustible and nonflammable square tubes is gbt- (gbt-). The representative material is l-l pipeline steel. It specializes in selling square tubes， rectangular tubes， seamless square tubes， galvanized square tubes and galvanized tubes， with large quantity， high quality and low price. It is fire-resistant， waterproof， high temperature resistant， durable， safe and reliable. It is mainly used to transport combustible and nonflammable fluids， with high requirements.
Square tube flattening test is a kind of test to check the deformation performance of metal tubes (seamless square tubes and rectangular tubes) flattened to the specified size and show their defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards. Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally， sawing is adopted. The inner and outer walls of the pipe shall retain the original surface without any processing. Sample length L & asymp; D (D is the outer diameter of the pipe). When the outer diameter is large， the length l shall not exceed mm. When the outer diameter is less than mm， l = mm. When cutting the sample， the surface of the sample shall not be damaged and the performance of the metal shall not be changed due to heating or cold processing. The edge of the section shall be flattened. The flattening test is a test to check the deformation performance of the metal pipe (seamless square pipe and rectangular pipe) flattened to the specified size and show its defects. Relevant flattening tests shall be carried out in accordance with relevant provisions of test standards.
recommendeSquare pipes are mainly used in engineering buildings， glass curtain walls， door and window decoration， steel structures， guardrails， machinery， automobiles， household appliances， containers electric power， agricultural construction， agricultural greenhouses， bicycle frames， motorcycle frames， shelves， fitness equipment， leisure and tourism， steel furniture， various specifications of oil casing， oil pipes and pipeline pipes， water， gas， sewage， air Heating and other fluid transportation fire fighting and support， construction and other fields.
FHigh pressure oil pipe for diesel engine (gb-) is a cold drawn square pipe for high pressure pipe of diesel engine system.
Square tube is a kind of square tube type. Many materials can form square tube body. It is used for what purpose and where. Most square tubes are steel tubes， mostly structural square tubes， decorative square tubes and building square tubes. Square tubes can be divided into seamless and welded joints. Seamless square tubes are formed from seamless circular tubes.
cAfter 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 will be straightened. After straightening， the steel pipe is sent to the gold pipe by belt
zYSquare tube is a kind of square tube， which is rolled by strip steel after process treatment. Many kinds of materials can form a square tube body. It is used for what purpose and where. Most square tubes are steel tubes， mostly structural square tubes， decorative square tubes and building square tubes. Generally， the strip steel is unpacked leveled， plastic design usually calculates the allowable stress according to the safety factor that the allowable stress is not less than the dynamic load and multiplied by the allowable stress. In the case of bending of an axis which is rolled into a square tube and then cut to the required length. Usually pieces per bag.
In the case of dynamic load crimped and welded to form a circular tube， it can be calculated by the formula a = W. replacing the calculated strength with plasticity can improve the bearing capacity of the member by %.