Double-sided submerged arc welding straight seam steel pipe main process description (1)Check the raw materials in various ways. Raw materials generally refer to the strip coil, welding wire, flux and so on. Before put into the strict physical and chemical inspection, in order to ensure the quality.

Why steel pipe should be anticorrosion? As the name suggests, steel pipe anticorrosion is to prevent corrosion of steel pipe, reducing the service life. pe anticorrosive steel pipe processing transmission of petroleum, water, natural gas and other pipeline projects, will use the steel pipe as an economic transmission material, but some of the material and chemical elements of the steel pipe decide that it does not have a long term resistance to corrosion, which greatly shortens the service life, regardless of whether it is buried or overhead, will be faced with the problem, then, how to Solve this problem? Later, people invented to the outer wall or inner wall of the steel pipe to do coating anti-corrosion, to effectively control and prevent steel pipe corrosion method.

For the installation and use of straight seam steel pipe, there are strict technical requirements, according to the actual situation, but also in accordance with the operating procedures to ensure safety and quality. In the general use process, LSAW steel pipe needs to pay attention to the following points:

Carbon tool steel ① steel number is crowned with “T”, so as not to be confused with other steels. ② steel number in the number of carbon content, the uniform carbon content of a few thousandths. For example, “T8” indicates that the uniform carbon content of 0.8%. ③ manganese content is higher in the steel number marked at the end of the “Mn”, such as “T8Mn”. ④ high-quality carbon tool steel phosphorus, sulfur content, lower than the general quality of carbon tool steel, in the steel number at the end of the letter “A”, to show the difference For example, “T8MnA”.

Steel pipe appearance, seamless steel pipe and welded steel pipe difference in the welded pipe inside wall has welded rib, while the seamless does not.

Steel pipe corrosion problems prevail in the national economy and national defense construction of various sectors, both to the national economy has brought great losses. Also to the production and life caused great difficulties. Steel pipe in natural conditions (atmosphere, natural water, soil) or man-made conditions (acid, alkali, salt and other media), every moment in the corrosion.

Spiral pipe, also known as spiral steel pipe or spiral welded pipe, is the low carbon structural steel or low alloy structural steel strip according to a certain helix Angle (called forming Angle) rolled into a tube blank, and then welded together the pipe seam made of it can be used to produce large diameter steel pipe with a narrower strip. What is the cause of slag inclusion in the production of spiral pipe?

Seamless steel pipe surface treatment is one of the important factors in the selection of steel pipe anti-corrosion application life limit, and it is the standard for the robust integration of anti-corrosion layer and seamless steel pipe.

That is, pickling, cleaning, rinsing, dip coating solvent, drying. Welded pipe from the truck crane to pickling tank for pickling (each crane 2 tons or so). 26% or so of hydrochloric acid solution for pickling, in order to prevent excessive pickling and acid mist volatilization, in the pickling solution to add 0.5 ~ 1.0g / L corrosion inhibitors and mist suppressant, pickling at room temperature, pickling time is generally 30 ~ 60 minutes, in order to make the steel pipe can be uniform pickling, the use of cranes will be lifted in the process of pickling 2 ~ 3 times the pipe to improve the effect of pickling. In order to improve the effect of pickling, the steel pipe is lifted by crane 2~3 times during the pickling process.

First, the anti-corrosion structure of anti-corrosion steel pipe Anti-corrosion generally consists of three layers: the first layer of epoxy powder (FBE>100um), the second layer of adhesive (AD) 170 ~ 250um, the third layer of polyethylene (PE) 2.5 ~ 3.7mm. the actual operation of the three materials will be blended into a single entity, through the processing of the steel pipe to make it a solid combination of the formation of excellent corrosion protection layer. The processing method is generally divided into winding type and round mold coating type two.

1. Role of coating materials In order to prevent rusting, the outer surface of steel pipe is coated. Rust on the surface of steel pipe will affect the actual use effect, quality and appearance image. Therefore, the coating process of steel pipe has a great influence on the quality of steel pipe products. 2. Requirements of coating materials

Galvanized square pipe is a kind of with hot-rolled or cold-rolled galvanized steel strip or galvanized coil as a billet, after cold bending processing and forming, and then by high-frequency welding made of hollow square cross-section type steel pipe. Or will be made in advance of the cold bending hollow type steel pipe and then processed by hot dip galvanized galvanized.

The method of checking the material of pipe fittings The material of stainless steel pipe fittings is crucial to their quality. When using stainless steel pipe fittings, you can assess its material by the following methods. Check the glossiness and surface smoothness of this piece by observation and touch. The surface of high-quality stainless steel fittings should be glossy and smooth, while poor-quality fittings may show dullness and roughness.

Stainless steel pipes often require welding during use. To ensure their performance, especially in special work environments, protection measures are necessary. Here's how to protect stainless steel pipes during welding:

In the stainless steel industry, nitrogen is often used, especially in the welding process of stainless steel welded pipes. Many wonder why this is necessary. Here's an explanation: