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PontiniHot dip galvanized square pipe and rectangular pipeA Brief Talk on the Matters Needing Attention in Selection

release time:2021-11-30 10:05:11Release user:256HP158312377

During the pushing process of spot welding and repair welding elbows, there will be thinning, so manufacturers usually use thick spot pipes. If thin raw materials are used the products produced must be unqualified. Generally, the thickness is significantly lower than the standard.

The floating mandrel mill is in its heyday

PontiniFunction index analysis of square tube - strength and plasticity discussed later are machine function indicators of metal under static load. In practice, many mechanical machines are under repeated load employment. In this environment, the whole opportunity is tired.

After spraying (throwing) derusting it can not only expand the physical adsorption on the pipe surface, spray (throwing) derusting is an ideal derusting method for pipelines. Generally speaking but also enhance the mechanical adhesion between the layer and the pipe surface. Therefore, 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).

Ebolowa,The first is to remove the rust of the square tube. When removing the rust of the square tube, the steel wire brush is mainly used to polish its surface, which can effectively remove the loose or rusty rust on the surface of the square tube.

C. electric furnace steel: (a) electric arc furnace steel; (b) Electroslag furnace steel; (c) Induction furnace steel; (d) Vacuum consumable furnace steel; (e) Electron beam furnace steel.

Solution treatment and nondestructive testing sand rolling treatment and sand blasting treatment many manufacturers in the market do not do solution treatment and 100% penetration nondestructive testing, and many of them use sand blasting instead of sand rolling. After these steps are omitted, the cost is greatly reduced.


PontiniHot dip galvanized square pipe and rectangular pipeA Brief Talk on the Matters Needing Attention in Selection



Derusting: This is an important process for galvanized square pipes and components before coating, and it is the key to the quality of galvanized square pipes. Thorough derusting can improve the adhesion of antirust paint and prolong the service life of galvanized square pipe.

Shot blasting is a high-speed rotating impeller that throws small steel shot or small iron shot out and hits the surface of the square tube at high speed, so the oxide layer on the surface of the square tube can be removed. At the same time, the steel shot or iron shot strikes the surface of the square tube at high speed, resulting in lattice distortion and deformation on the surface of the square tube and increasing the surface hardness

Welding is a synthetic gradient material, which can be used as solder to weld special-shaped materials in order to overcome the mismatch of chemical, mechanical and physical properties between base metals.

reform,Comprehensive classification ordinary steel A. carbon structural steel: (a) Q19 (b) Q215 (b); (c) Q235(C); (d) Q255( B); (e) Q275.

Q345B square tube is a product appeared in recent years, which mainly has strict tolerance and roughness for the dimensions of inner hole and outer wall. Production process classification of large-diameter q355b square tube large-diameter q355b square tube is divided into hot-rolled seamless square tube, cold drawn seaml,ess square tube, seamless square tube and q355b square tube according to production process. Among them, q355b square tube is divided into: (a) by 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 (b) are divided by weld & mdash& mdash; Material classification of straight seam welded square pipe and spiral welded square pipe large diameter q355b square pipe: plain carbon steel square pipe and low alloy square pipe. Ordinary carbon steel is divided into Q19 Q2 q23 SS400, 20# steel, 45# steel, etc; Low alloy steels are divided into q34 16Mn, Q390, St52-3, I'll give you a detailed introduction to the heating technology of the lower tubes.


PontiniHot dip galvanized square pipe and rectangular pipeA Brief Talk on the Matters Needing Attention in Selection



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, 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 indus?try, steel structure shipbuilding, automobile, steel beam a{nd column}, special purpose, large-diamete(r 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 a:nd welded to form a round pipe, then rolled into a square pipe from the round pipe, and then cut into t|he required length. Usually 50 pieces per bag. Q355b square pipe, also known≦ as ?square and re≧ctangular 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 wal;l thickness is greater than 10mm,Spraying (throwing) derusting spraying (throwing) derusting is that the high-power motor drives the spraying (throwing) blade to rotate at high speed, so that th(e steel sand), steel shot, iron w;ire section, minerals and other abrasives can be sprayed (thrown) on the surface of the square tube under the action of centrifugal force, which can not only completely remove rust, oxides and dirt, but also the square tube under the violent impact and force of abrasives, It can also achieve the required uniform roughness.

After the process of polishing, the surface effect of the square tube is quite good. The quality of the polishing process directly affects the external image of the square tube. Therefore, we must choose the appropriate polishing according to the above, and pay more attention to the polishing process of the square tube.

During the pushing process of spot welding and repair welding elbows, there will be thinning, so manufacturers usually use thick spot pipes. If thin raw materials are used, the products produced must be unqualified. Generally, there are about 40 wires thinned. If the technology is not good or the drawn pipe is used the thickness is significantly lower than the standard.

Pontini. fake and inferior square tubes are easy to fold. Folding is a variety of broken lines formed on the surface of square tubes, and this defect often runs through the longitudinal direction of the whole product. The re.ason for the folding is that the fake and shoddy manufacturers pursue the rate, the red,uction is too large, res!ulting in ears, folding occurs during the next rolling, the folded products will crack after bending, and the strength of the square tube will be greatly reduced.

Steel pipe for geological drilling (yb235-7) is a steel pipe used by geological departments for core drilling. It can be divided into drill pipe, drill collar, casing, sedimentation pipe, etc.

Q345B square tube is a product appeared in recent years, which mainly has strict tolerance and roughness for the dimensions of inner hole and outer wall. Production process classification of large-diameter q355b square tube large-diameter q355b square tube is divided into hot-rolled seamless square tube, cold drawn seamless square tube, seamless square tube and q355b square tube according to production process. Among them, q355b square tube is divided into: (a) by 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 (b) are divided by weld & mdash& mdash; Material classification of straight seam welded square pipe and spiral welded square pipe large diameter q355b square pipe: plain carbon steel square pipe and low alloy square pipe. Ordinary carbon steel is divided into Q19 Q2 q23 SS400, 20# steel, 45# steel, etc; Low alloy steels are divided into q34 16Mn, Q390, St52-3, etc.

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