Yaang Pipe Industry: steel pipe

Showing posts with label steel pipe. Show all posts

Wednesday, December 21, 2016

What kind of technical requirements for different purposes of the steel pipe

Usually, according to the purpose of the steel pipe and working condition is different, dealing with the allowable deviation of the size of the steel pipe, surface quality, chemical composition, mechanical properties, process performance and other special performance and so on different technical conditions were put forward.

Common defects of steel pipe

First, the inner surface defects
1 internal fold
Features: in the inner surface of the steel pipe is a straight line or a spiral, a half - Helical zigzag defect.
Cause of production:

The identificThe identification method of steel pipeation method of steel pipe

Method for the identification of steel pipe
1 fake steel pipe prone to collapse.
Folding is a kind of broken line formed on the surface of steel pipe, which often runs through the whole product. Folding is due to shoddy manufacturers to pursue high efficiency, pressure amount slants big, produce Erzi, a rolling produced folding, folding products after bending will crack and the strength of steel big decline.

Connecting method of large diameter spiral steel pipe

The most common way to connect large diameter spiral steel pipe is to weld, but in some projects, it is often used in the form of screw connection, flange connection, socket connection and groove connection.

Eliminating the magnetic field generated around the spiral steel pipe

Reasons for the magnetic field of spiral steel pipe

In the welding process, welding by DC welding, in welding line, and the position of the welding head due to the high current, resulting in a strong magnetic field, pipe body under the action of magnetic field, magnetic moment or tend to obtain and external magnetic field in the same direction are arranged. When the welding end, magnetic field gradually decreased till disappeared, due to the hysteresis phenomenon, in the tube body and residual magnetic flux density, this is what we say normally remanence.

Analysis of the causes of the wrong side of spiral steel pipe

Spiral steel pipe in the production process if the production process is unreasonable, machine parameter settings shall be deemed to occur deviation phenomenon, especially large diameter spiral steel pipe, which is often said the wrong side of the phenomenon.

After spiral steel pipe wrong side analysis of the causes produce the wrong side is very necessary, the following is a common cause of generating the wrong side.
1, strip steel camber is caused by the wrong side of the most important factors. In forming the spiral welded pipe, steel strip camber angle will constantly change shape, leading to changes in the weld gap, resulting in open seam, wrong side or even take sides.

Why not easy to corrode stainless steel pipe?

Why not easy to corrode stainless steel pipe?

All metal and atmospheric oxygen in the reaction, formed in the surface oxide film. Unfortunately, in the ordinary carbon steel pipe on the formation of the oxidation iron oxide continue, kept expanding rust, eventually forming holes. Can use paint or resistant to oxidation of the metal (for example, zinc, chromium and nickel) on plating to ensure that the carbon steel pipe surface, however, as we know, the protection is only a thin film. If the cover was damaged, the following steel began to rust.

The factors affecting the performance of the large flange by yaang.com

In the production of large flange, there were many elements affect the function of large flange, let's say the rare several elements, the beginning is the annealing temperature, annealing temperature for the primer and template joint at the temperature of the parameter, when 50% of primers and

How to easily find the welding defects in the welded steel pipe by yaang.com

Spiral welded steel pipe is a kind of welding pipe, which can be welded in the manufacturing process, and there are many defects in the welding area. This is certainly detrimental to the quality and performance of the welded tube, so if we can make it clear that the causes of these defects can be resolved in a timely manner.

Cause of rust and pollution of stainless steel pipe and notice by yaang.com

Stainless steel pipe products with excellent corrosion resistance, and not easy to rust, it is as I mentioned earlier, its composition containing chromium elements. Combines with oxygen in air and solid surface and form a tight-knit not state oxide, this does not scale membrane can prevent the steel surface oxidation (rust), and can play a role of protecting surface, in order to prevent the corrosion of various corrosion factors.

Characteristics of seamless steel pipe By yaang.com

Characteristics of seamless steel pipe products:
1, chemical analysis: the chemical composition of the chemical analysis, chemical composition in line with the standard requirements.

Method for solving the welding gap of four kinds of control stainless steel welded pipe By yaang.com

How to adjust the weld gap is an important step in stainless steel welded pipe production, such as the gap is too large, resulting in a decrease of proximity effect, eddy heat is insufficient, the joint between the weld crystal bad and incomplete fusion or cracking; Gap is too small to cause proximity effect increases, the welding heat is too big, cause the burning of the weld; Or weld after extrusion, rolling the deep pit formation, affect the surface quality of the weld.

The application and generalization of the stainless steel pipe By yaang.com

Stainless steel pipe safety, health, environmental protection, economy applicable, piping of thin wall, and new methods for reliable, simple and convenient connection of successful development, make its have more other pipe irreplaceable advantages, the application of engineering will be more and more, use will be more and more popular, good prospect.

Flange connection mode in the field of industry By yaang.com

Flange is an industry often used in the field of fasteners, has extremely extensive application in various industries. As in recent years, with the increase of voltage level to double circuit transmission line tower, the four circuits and so on large-scale development. The traditional Angle steel tower already cannot satisfy the requirement of circuit design. In contrast, steel pipe tower is famous for its big stiffness, clear, and the advantages of small wind power transmission path, has been more and more widely used in the line iron tower.

Estimate Burst Pressure Of Steel Pipes Or Tubes by yaang.com

Barlow's formula can be used to estimate burst pressure of steel pipes or tubes.

P = 2 s t / (do SF)

where

P = max. working pressure (psig)

s = material strength (psi)

t = wall thickness (in)

do = outside diameter (in)

SF = safety factor (in general 1.5 to 10)