In & sigma; Expressed in%. The calculation formula is: where: L1 -- gauge length after sample breaking, mm; L0 -- original gauge length of sample, mm. Reduction of area (& psi;) in the tensile test, the percentage between the large reduction of the cross-sectional area at the reduced diameter and the original cross-sectional area after the specimen is broken is called the reduction of area. In & psi; Expressed in%. The calculation formula is as follows: where: S0 -- original cross-sectional area of the sample, mm2; S1 -- small cross-sectional area at the reduced diameter after sample breaking, mm2.
Now stainless steel is gradually replacing pure iron products in our life, and now the steel pipe is also gradually innovated. Now the q355b square pipe is a typical representative. However, the above small series are not the focus. Today, the focus is on the analytical process of q355b square tube sizing rolling.
Santa-Cruz.Forging square tube: a kind of pressure processing in which the reciprocating impact force of the forging hammer or the pressure of the press changes the blank into the shape and size we need. It is generally divided into forging and die forging. It is often used to produce large-scale materials and materials with large square tube size.
Material of square tube: q23 Q345 (16Mn), 20#, alloy steel, stainless steel.
.Production standard classification square tube is divided according to production standard: national standard square tube, Japanese standard square tube, American standard square tube, oil refining and chemical engineering according to the design requirements. The purpose of degreasing is to prevent the transported or stored materials from being contaminated by grease or organic matter; Avoid mixing transported or stored materials with grease or organic matter; Oil content to ensure the activity of the catalyst; The content of oil and organic matter to ensure the purity of the product. The installed square pipe shall be disassembled into pipe sections for degreasing. Pipes that cannot be disassembled after installation shall be degreased before installation. Square pipes with obvious oil stains or serious corrosion shall be cleaned by steam purging air separation unit, sand blasting or other methods before degreasing.
Q355b square pipe for mining fluid transportation, Standard No.: gbt14291-2000. The representative material is Q235 grade B steel,Santa-CruzPrice of DN100 galvanized square pipe, which is mainly used for coal mine air pressure, drainage and vertical shaft gas drainage straight seam q355b square pipe.
Except for the thickening of the wall thickness, the corner size and edge flatness of the square pipe are uniform
Tool derusting mainly uses tools such as steel wire brush to polish the surface of square pipe, which can remove loose or oxidized scale, rust, welding slag, etc. The derusting of manual tools can reach grade SA2 and that of power tools can reach grade SA3. If the square pipe surface is firmly attached with iron oxide scale,Santa-Cruz48 galvanized square pipe, the derusting effect of tools is not ideal and can not reach the anchor depth required by construction.
For seamless q355b square tubes, there is a certain hardness, so there are still many for bearing in application, so it is necessary to test the mechanical properties of seamless q355b square tubes.
Marketing Department.Requirements for samples samples can be taken from metal pipes with qualified appearance. Generally, sawing is adopted.
2 before slicing. Highlight: push your hand straight up and down without bending and tremor. Don't know when it's down. Take a constant speed and hand power to stabilize it. Don't slice or cut it completely.
In short, the square tube production process includes these processes: tube blank & mdash& mdash; Cut off & mdash& mdash; Heating & mdash& mdash; Perforation & mdash& mdash; Pipe rolling & mdash& mdash; Sizing (reducing) & mdash& mdash; Straightening & mdash& mdash; Cut head and tail & mdash& mdash; Inspection & mdash& mdash; Packaging & mdash& mdash; Warehousing.
The detailed steps for cutting square tubes are as follows: what is used for cutting square tubes? Seamless square tubes can only be processed successfully after certain steps in processing and engineering. The first step that must be experienced in processing is to cut seamless square tubes. There are various cutting methods for seamless square tubes. Today, I'd like to introduce a method of cutting seamless square tubes with slices, It is recommended to cut according to the following provisions: select a uniform surface to select potatoes; The large diameter is not too much, or they don't cut well; B choose sharp seeds, slightly larger ones, and small needles. Sometimes large potatoes are not long enough; C. select flat, sink and vegetable board. When it is uneven, it will be cut continuously; When the texture is light cut the die-cutting board will follow.
how much.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, and the unit is nmm2 (MPA). It represents the large capacity of metal materials under tension.
The floating mandrel mill is in its heyday
Among them which is called tensile strength (& sigma; b), q355b 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.
Santa-Cruz.The butt joint between the head and tail of square pipe and strip steel adopts single wire or double wire submerged arc welding, and automatic submerged arc welding is adopted for repair welding after rolling into square pipe.
On the basis of thermodynamic calculation, the quality assurance of square tube, rectangular tube, seamless square tube, galvanized square tube and galvanized tube is professional. New and old customers are welcome to consult during the preferential activities. The process conditions of calcium treatment of 20CrMo sulfur-containing square tube are analyzed, and the sulfur-containing gear rolled products after calcium treatment are sampled and studied. The conclusions are as follows: in order to minimize the generation of Cao in sulfur-containing square tube steel, Omega in molten steel; (O) It must be taken off to 10 & times; The rate of calcium can only be guaranteed below 10-6.
At present, there is still a lack of research on surface adhesion, there is no systematic and perfect theory to guide the preparation of anti adhesion inner surface of pipeline, and there is a lack of operable and low-cost inner surface preparation technology of square pipe. In terms of solid surface adhesion mechanism,Santa-CruzWelded square pipe, based on the solid-liquid interface adhesion work theory and smooth solid surface model, studies the dynamic movement characteristics of solid-liquid vapor phase line, directly analyzes the adhesion process, and establishes a line spreading model based on small system energy, It provides theoretical guidance for the preparation of anti adhesion surface of pipeline.