Q355b square tube is a kind of hollow square section steel square tube, also known as hollow cold-formed section steel. It is a section steel with square section shape and size made of hot-rolled or cold-rolled strip or coil plate after cold bending and high-frequency welding.
After aluminum deoxidation in molten steel, & omega; When (ALS) is 0.015% ~ 0.025%, calcium treatment can achieve better effect on the denaturation of Al203.
Hartsfield.After spraying (throwing) derusting, it can not only expand the physical adsorption on the pipe surface, but also enhance the mechanical adhesion between the layer and the pipe surface. Therefore, spray (throwing) derusting is an ideal derusting method for pipelines. Generally speaking, shot blasting (sand) is mainly used for the inner surface treatment of the pipe, and shot blasting (sand) is mainly used for the outer surface treatment of the pipe. Several problems should be paid attention to in derusting by spraying (throwing).
As for the color treatment technology of q355b square tube, the application of color q355b square tube treatment technology includes chemical method and electrochemical method from the process point of view. They can get different colors by treatment in specific electrolyte, color and variety of q355b square tube, which can be applied to different occasions and obtain different economic benefits.
.The difference between q355b square tube and Q345A is that there are fewer impurities s and P and better low-temperature impact performance. From the welding point of view when the impurity elements in the base metal are less, it is good for welding hot crack.
After the square tube is cut into a single square tube, the head and root of each batch of square tube shall be subject to strict first inspection. The mechanical properties, chemical composition, fusion condition, surface quality of square tube and NDT shall be carried out to ensure that the pipe making process is qualified before it can be officially put into production.
Functional index analysis of square tube - mechanical function of plastic square tube.
According to production, square tubes are divided into hot-rolled tubes, cold-rolled tubes, cold drawn tubes, tubes, pipe jacking, etc. According to the section shape, the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes, such as square, oval, angular, angular, melon seed, star and winged tube.
Section shape classification of large-diameter q355b 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 q355b 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 q355b square pipe purpose classification square pipe is classified according to purpose & mdash& mdash; Square tubes for decoration, machine tool equipment, machinery industry, chemical industry, shipbuilding automobile, steel beam and column, special purpose, large-diameter q355b square tube wall thickness classification, large-diameter q355b square tube according to wall thickness Classification & mdash& mdash; Super large diameter q355b square pipe, large diameter q355b square pipe and thin-wall large diameter q355b square pipe rectangular pipe are the names of square pipe and Q345B 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 50 pieces per bag. Q355b 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 q355b square pipe shall not exceed plus or minus 10% of nominal wall thickness when the wall thickness is not greater than 10mm, plus or minus 8% of wall thickness when the wall thickness is greater than 10mm, except for the wall thickness of corner and welding joint area.
There are several kinds of color q355b square tubes: high temperature oxidation method, chemical oxidation method, electrochemical oxidation method, ion implantation method and gas phase cracking method.
packing.In terms of hot working, but also improve the anisotropy of steel.
It seems that preheating the q355b square tube can avoid a lot of problems, and there will be a better guarantee that the q355b square tube itself is a quality problem.
The standard quantity of combustible and nonflammable square pipes is gbt97-1 (gbt97-199). The representative material is l245-l4 pipeline steel. Professional square pipes, seamless square pipes, galvanized square pipes and galvanized pipes are of high quality and low price. They are fire-resistant waterproof, durable, safe and reliable. They are mainly used to transport combustible and nonflammable fluids with high requirements.
Trustworthy.The tensile test is to make q355b into a sample, pull the sample to fracture on the tensile testing machine, and then measure one or more mechanical properties. Usually, only tensile strength, yield strength, elongation after fracture and reduction of area are measured. Tensile test is the basic mechanical property test of metal materials. Almost all metal materials have specified tensile test as long as they have requirements for mechanical properties. Especially for those materials whose shape is not convenient for hardness test, tensile test has become the only means to test mechanical properties.
Comprehensive classification ordinary steel A. carbon structural steel: (a) Q19 (b) Q215 (b); (c) Q235(C)； (d) Q255( B)； (e) Q275.
Stainless steel q355b square pipe for fluid transportation Standard No.: gbt12771-1991. The representative materials are 0Cr 0cr19ni 00cr19ni 00cr1 0cr18ni11nb, etc. It is mainly used to transport low-pressure corrosive media.
Hartsfield.According to production, square tubes are divided into hot-rolled tubes, cold-rolled tubes, cold drawn tubes, tubes, pipe jacking, etc. According to the section shape, the square tube is divided into round and special-shaped. The special-shaped tube has many complex shapes, such as square, oval, angular, angular melon seed, star and winged tube.
Drawing process flow of square tube in the production process of square tube, it needs a lot of processes to complete the production process, so that the production quality of square tube can be more strictly guaranteed. This paper mainly introduces the drawing process flow of square tube. Let's understand it below.
When processing the square tube, some processes need to heat the seamless square tube. The heating operation in the processing of the seamless square tube plays a very key role in the quality of the finished seamless square tube.