Belize46 galvanized pipeMatters needing attention in handling and application

announcer:hp256HP158312377 release time:2022-02-15 14:37:01

Be sure to select special for square pipe cutting.

Both internal and external welding of square pipes are carried out by American Lincoln Electric welding machine for single wire or double wire submerged arc welding, so as to obtain stable welding specifications.

Belize.If the surface is not so flat, and the size and thickness are not standardized, it can reflect that this square tube is a poor product& rdquo;

During the storage of square tubes, pay attention to the stacking layers of square tubes to avoid local stress at the tube end caused by too many layers, resulting in radial plastic deformation and layer damage of square tubes. It is recommended that the stacking layers of smooth pipes refer to apirp 5l1-2009 Recommended Practice for railway transportation of square pipes for pipelines or apirp 5lw-2009 Recommended Practice for ship and sea vessel transportation of square pipes for pipelines. It can also be determined by test or implemented according to the safe stacking height of square pipes. The stacking layers of pipes shall be implemented according to GBT 23257-2009 polyethylene layer of buried steel pipelines.

.In the standard of q355b square tube, most of them specify tensile test and hardness test at the same time. For those materials that are not convenient for hardness test, such as q355b square tube, only tensile test is specified. In particular the new portable surface Rockwell hardness tester and pipe Rockwell hardness tester can quickly and accurately test the hardness of stainless steel plate, stainless steel strip and q355b square tube as thin as 0.05mm, which makes it easy to solve the problems that were difficult to solve in China in the past.

The performance advantage of square tube after calcium treatment requires not only high strength, but also good machining performance. For sulfur-containing square tube, sulfur can improve the machinability of steel, so the sulfide inclusion in square tube is the key to determine the quality of steel. Sulfur mainly exists in the form of MNs in the steel. The single MNS inclusion is light black strip. The inclusion with this morphology cuts off the continuity of the steel matrix and makes great differences in the anisotropic properties of the steel. Calcium treatment of molten steel can inhibit the formation of MNS inclusions and combine MNS with al20 CAS to form composite spindle inclusions. Such inclusions can improve the machinability of steel and avoid the adverse impact of MNS inclusions on the properties of steel.

Hot rolled q355b square tube continuous casting slab or blooming slab is used as raw material, heated by stepping heating furnace and descaled by high-pressure water into roughing mill. Roughing material enters finishing mill after head cutting, tail cutting and then computer rolling. After final rolling, it is rolled into straight hair coil through laminar cooling and coiler. The head and tail of straight hair curl are often tongue shaped and fish tail shaped, with poor accuracy of thickness and width, and there are often defects such as wave shape, hem, tower shape and so on. The coil weight is heavy and the inner diameter of the steel coil is 690mm.


Belize46 galvanized pipeMatters needing attention in handling and application



At the same time, hanging heating shall be carried out during heating to reduce quenching deformation. For high-precision guide rail, gas nitriding or ion nitriding shall be carried out to reduce deformation; Square tubes have outstanding performance in all aspects of performance. We will also test them in this regard when making square tubes more durable. What outstanding performance do square tubes have in mechanical properties? Next, I'll introduce it to you.

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, the appearance and quality of the square tube have been improved to another height,BelizeGalvanized square pipe, making the current square tube present in the market in a good state.

where.Two main factors should be considered in the design of square pipe section: one is the safety of the section; the other is the economy of the section. For the safety of the section, its economy is expressed by the ratio of torsion radius to its mass.

On the basis of thermodynamic calculation, the quality assurance of 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 seamless square tube, 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.

The normal process flow is as follows: the round steel is perforated to form a tube embryo, then pickling is carried out, the black skin on the outer surface is washed off,Belize26 galvanized pipe, and then grinding is carried out. After passing the inspection, the rolling mill or cold drawing and cold drawing are carried out. Annealing is required for wall reduction, but not for air drawing. After forming, annealing and straightening are carried out, and pickling is tested and stored in the warehouse. Basically, these are the processes. Better manufacturers will perform whitening treatment during annealing to make the surface treatment more beautiful. The narrow blank of square pipe can produce welded pipe with larger diameter and the blank of the same width can also produce welded pipe with different diameter. However, compared with the straight seam square pipe with the same length, the weld length increases by 60%, and the production speed is low. Square pipes with large or thick diameter are usually made of steel blank directly, while small welded pipes and thin-walled welded pipes only need to be directly welded with steel strip. Then after simple polishing, wire drawing is OK. Therefore, straight seam welding is mostly used for relatively welded pipes, and spiral welding is mostly used for large-diameter welded pipes.


Belize46 galvanized pipeMatters needing attention in handling and application



Therefore, the drawing process of square tube is quite meticulous. For a long time, square tube, square tube,BelizeModel of galvanized round pipe, seamless square tube, galvanized square tube, galvanized tube and other brand products are provided with complete designated products and quality assurance. In the process of continuous development, the pipe end protector shall be removed to avoid moisture gathering on the surface of the pipe end protector and the square pipe, which is difficult to volatilize.

Belize.After the square pipe is produced, the surface treatment is generally carried out, 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.

Except for the thickening of the wall thickness, the corner size and edge flatness of the square pipe are uniform

The raw material for rolling square tube is round tube blank. For a long time, square tube, rectangular tube, seamless square tube, excellent quality and favorable price. The round tube embryo shall be cut and processed by cutting machine, and the blank with a growth of about 1m shall be brought to the furnace for heating. The billet is sent to the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature in the furnace is the key problem. After the round tube billet is discharged from the furnace, it should be pierced through the pressure piercer. Generally, the more common piercer is the conical roll piercer. This piercer has high production efficiency, good product quality, large perforation expansion and can wear a variety of steel grades.