As an important part of iron and steel products, steel pipe plays an essential role in the development of national economy. According to the different forming process, welding method and the used tube billet shape, steel pipe can be divided into the following kinds: large diameter seamless pipe, ERW steel pipe and spiral...

Hot rolled strip steel of SSAW (Spiral seam submerged arc welding steel pipe) is bent according to the spiral shape. Then, spiral seam welded steel pipe which is also called spiral welded pipe, spiral pipe, spiral steel tube is made by the inseam and outer seam of automatic submerged arc welding. For the following reason,...

With the rapid development of economy in China and the increase consumption of stainless steel, demands for stainless steel pipe also increase. The stainless pipe market prospect is good.   Stainless steel seamless tube market demands come from basic industries, such as petroleum, chemical industry, power generation....

1．Welding material According to 15CrMo Steel weldability, on-site working characteristics of high pressure pipeline and reference to welding process card provided by abroad, we select two kinds of schemes to conduct the welding test based on past experience.   SchemeⅠ: First, conduct the welding preheating method....

Now, a lot of metallurgical equipments in our country can be designed, manufactured and integrated by ourselves. After China jointly designing with foreign countries and summarizing the experiences and lessons of installation, commissioning, usage, maintenance, and transformation of foreign equipments, our current design...

There are several methods for you to identity forged and fake seamless pipes as follows:   1. There is often pitted surface phenomenon on appearance. Pitted surface phenomenon is irregular and uneven defects which were caused by the worn grooves. Forged and fake seamless steel tube manufacturers try their best to...

Seamless steel tube in pipe insulation can be classified into two categories: hot-rolled seamless steel tube and cold-rolled seamless steel tube. Hot-rolled seamless steel tube has the following kinds: common steel tube, low-pressure boiler steel pipe, medium-pressure boiler steel pipe, high-pressure boiler tube, alloy...

High-frequency pipe has many problems among which opening and crack are the two common ones. This artcile introduces about the two problems and its relevant solutions.   1.Opening   (1) Characteristics Crack openings > = 0.4 mm. Welded joint is straight. Plate edge end face without melting trace or with melting...

Galvanized pipe can be classified into two kinds: cold galvanized steel pipe and hot dip galvanized steel pipe. The former has been forbidden, and the latter has been advocated temporarily in China.   1. Hot Dip Galvanized Steel Pipe   Hot dip galvanized steel pipe is to make the molten metal react with iron...

Welded steel pipe is shaped up by crimping steel plate or steel belt and then it was made after welding. Welded steel pipe can be classified into longitudinally-welded pipe and spiral welded steel pipe according to the ways of welding. The common forming technique of longitudinally-welded pipe is UOE forming process and...

Seamless steel pipe can be classified into the following several kinds because of its different standards:   1. GB/T8162-1999 (the structure is made by seamless steel tube). It is mainly used for the general structure and the mechanical structure. It represents textures (brands) : carbon steel No 20 and No 45; Alloy...

Double-sided Submerged Arc Welding (LSAW - Longitudinal Submerged Arc Welded), a new kind of welding method, was invented in 1940. Compared with the manual welding, the same point is that LSAW is using slag protection technology, but the slag is not the coating of electrode. The welding flux is made of by the slag specially...