Denver30 price of galvanized square pipePoor fire performance

After perforation, the round tube blank is successively rolled by cross rolling,Denver30 hot dip galvanized square pipe, continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing, the steel pipe enters the cooling tower for water spray cooling. After cooling, the steel pipe will be straightened. After straightening the steel pipe

In the trend of the times, we will change with the changes of the times, so that the square tube can be used more widely. In our daily life, we will the use of the square tube, so that we can use the square tube more in future production. Next let's introduce the difference between carbon steel and square tube.

Denver.Cold drawn or cold rolled precision square tube (gb3639-200) is a cold drawn or cold rolled precision square tube with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The selection of precision square mechanical structure or hydraulic equipment can greatly save machining hours, improve material rate and improve product quality.

Avoid contact with pollutants such as oil and copper when storing square tubes.

.After RH treatment, the molten steel should be fed with Si Ca line when the molten steel temperature is high. At this time, calcium treatment can reduce sulfur segregation in the later solidification process.

Electrochemical polishing: long specular gloss,DenverSquare steel pipe, stable process, less pollution and good durability. Suitable for mass production, it is mainly applied to high-grade products, imported products and public service products. Its processing technology is stable and the operation is simple.

It is mainly caused by the fact that the square pipe body has no cover, 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, it shall be protected with an uncovered object from the beginning of storage to avoid rusting,DenverGalvanized spiral pipe manufacturer, layer aging, edge warping and other phenomena of the square pipe.

The welded joints of square pipes are subject to on-line continuous ultrasonic automatic flaw detector to ensure the NDT coverage of spiral welds. If there are defects, it will automatically alarm and spray marks. The production will adjust the process parameters at any time to eliminate the defects in time.

The second is the pickling of the square pipe. Both chemical and electrolytic methods are used when pickling the square pipe. These two methods can remove the oxide skin of the square pipe.

The belt is sent to the metal flaw detector (or hydrostatic test) for internal flaw detection. If there are cracks, they will be detected. Steel pipes should be strictly selected manually after quality inspection. After the steel pipe is inspected, the number, specification, production batch number, etc. shall be sprayed with paint. And hoisted into the warehouse by crane.

Industry management.In case of doubt about the strength of solid q355b square tube, it can be based on tb10426 & mdash; 200 the compressive strength of q355b square tube on the surface of the structure is indirectly measured by the post loading method. The measurement should be carried out at the age of about 56 days, and the measured average strength is required to be not lower than the design value or the specified value. When the requirements are not met, 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.

High temperature diffusion heat treatment of ingot can improve the composition heterogeneity of ingot and improve the transverse performance of square tube.

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.

retailer.Due to the interaction between chromium and carbon in martensitic chromium nickel square tube, stable R phase region and stable a + R phase region are formed at high temperature. The increase of carbon content can expand the R-phase region, but the dissolution limit of carbon decreases with the increase of chromium content. The addition of nickel to martensitic chromium nickel square tube solves the problem that the hardness of steel is sacrificed to improve the corrosion resistance of martensitic square tube. However, the nickel content is not easy to be too high, otherwise the square tube will become austenite square tube due to nickel expanding austenite phase zone and reducing MS temperature, so as to completely lose the quenching ability.

Generally speaking, square pipe welding has a process: ignition, pressurization and thermal insulation.

Spray fluorocarbon paint after.

Denver.How to specify the yield point of square tube: if the stress decreases, the upper and lower yield points shall be distinguished. The unit of yield point is nmm2 (MPa

At the same time hanging heating shall be carried out during heating to reduce quenching deformation. For high-precision guide rail, I'll introduce it to you.

Section shape classification square tube is classified according to section shape: simple section square tube: square tube, rectangular square tube.