Elongation after square tube breaking (& sigma;): in the tensile test， the percentage of the length increased by the gauge length of the sample after breaking and the length of the original gauge length is called elongation. In & sigma; Expressed in%.
0Spiral square pipe for low-pressure transmission (standard of the Ministry of petroleum)， with the standard number of syt-. The representative material is qbqb and other carbon steel materials. It is mainly used for low-pressure transmission of water， oil， natural gas heating and other pipelines.
vThe principle of straightening machine is that a disc is divided into two sides to clamp round steel straight lines. Professional sales square tube， square moment tube，Q355d square tube seamless square tube，Galvanized round pipe manufacturerAnalysis of reasons for popularity high price sales galvanized tube， door-to-door service， on-site settlement， honest operation! The edge is one with radius r， and the other outer edge must be two equal diameters with radius R. The diameter of the reinforcement to be straightened is D， which requires us to conduct comprehensive consideration and analysis. In particular， the quality and level of the paint and the relevant technical level deserve our attention. Note that the square tube should not be used immediately after painting， but should be placed for a period of time and wait until the paint is dry!
FpetalAfter the square pipe is produced， the surface treatment is generally carried out，Q355d square tube that is the scale， rust， dirt and attachments on the surface of the square pipe are removed. Those that cannot be treated by physical treatment should be treated by chemical treatment.
MeDo a good job in the following aspects to effectively improve the service life of square tubes
The level of R-angle square tube is generally - times of the wall thickness. R-angle square tube of the size required by customers can also be produced according to the needs of customers; Square tube is a kind of long steel with hollow section and no joints around. It is a square tube formed by four sides of seamless tube mold. Square tube has hollow section. It is specialized in selling square tube， square rectangular tube， seamless square tube， galvanized square tube， galvanized tube， strict testing and quality assurance. In the process of preferential activities， welcome to consult. It is widely used as a pipeline for conveying fluid. It is mainly used in conveying， hydraulic support and mechanical structure，Q355d square tube Medium and low pressure， high pressure boiler tubes，Galvanized round pipe manufacturerAnalysis of reasons for popularity heat exchange tubes， the covering protection is not ideal， and there is no support， partly due to the excessive number of stacking layers， and most coastal areas belong to marine climate， with large annual rainfall， high air humidity， ponding in the square pipe and the square pipe. The protection shall be: if the bare pipe or pipe needs to be stored for a long time，Galvanized pipe_ Galvanized square pipe_ Seamless steel pipe_ Square tube - Wuxi Jiahang it shall be protected with an uncovered object from the beginning of storage to avoid rusting， layer aging， edge warping and other phenomena of the square pipe.
gSquare tube is a very good steel in economic construction. There are many kinds and principles of cold drawing. You may still have a lot of insufficient understanding of the cold drawing principle of each others pipe. Next， rectangular tube， seamless square tube and galvanized square tube shall be sold professionally. The performance of galvanized tube is stable， safe， reliable and maintenance free. The technical level has reached the domestic level and the advanced level of similar international products. Otherwise， the square tube will be corroded. The correct paint shall also be selected during painting， In this way， we can ensure that the square tube can be used more firmly， so as to ensure that the square tube will be better and better in future use. The square tube is used a lot in the soul. Each kind of square tube has a different role for the other tube. We choose different square tubes in the correct way， which can increase the performance of the square tube and be applied to different fields. Let me briefly introduce the square tube below.
SInspection basisThere are several kinds of color qb square tubes: high temperature oxidation method， chemical oxidation method， electrochemical oxidation method， ion implantation method and gas phase cracking method.
bQOrdinary carbon steel is divided into Q Q q SS， # steel， # steel， etc.
With the progress of the times， square tubes are used in more and more fields， and their scope of use is obviously increasing， which makes us have many kinds of square tubes. At this time， we need to store square tubes reasonably. Customers should also learn to arrange reasonably when storing square tubes. Lets understand how to store square tubes correctly.
After isothermal quenching， qqb square tube will have excellent rolling fatigue characteristics and corrosion resistance. Wear resistance， fracture toughness， impact toughness and bending strength. Therefore， in the subsequent production and application， qqb square tube will be used as the material of rolling mill flap ball screw. The qqb square tube of case hardening steel also has the surface compressive stress characteristics obtained by heat treatment， and its application range is expected to be improved and expanded.
Product rangexThe 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.
NStage ( & mdash; )
When cutting the square tube， there will be deformation， uneven incision and crack of the incision. What should we pay attention to when cutting the square tube and how to operate it? Today， I will introduce some problems that should be paid attention to when cutting the square tube. If the correct operation will make the square tube cutting work very smooth， please use a rag or cloth to clean the oil on the surface of the square tube Sundries or soil shall be completely clean.
pThe 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.
nFThe inclusions in the square tube treated with calcium can be denatured well， and the morphology of sulfide in the rolled stock is also improved.
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.