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What are the factors that cause horizontal stripes in spiral seam submerged arc welded steel pipes

What are the factors that cause horizontal stripes in spiral seam submerged arc welded steel pipes

Keywords :What are the factors that cause horizontal stripes in spiral seam submerged arc welded steel pipes        Update : 2022-06-08        View(s) : 32

The first may be due to the stress of the spiral seam submerged arc welded steel pipe . That is, the residual stress and welding stress after the steel pipe is formed. Secondly due to the presence of hydrogen. If the flux is not dried enough, the preheating temperature is not sufficient or the pr...

The main characteristics of TPEP anti-corrosion steel pipe

The main characteristics of TPEP anti-corrosion steel pipe

Keywords :The main characteristics of TPEP anti-corrosion steel pipe        Update : 2022-06-06        View(s) : 33

The main features of TPEP anti-corrosion steel pipe are: 1. The anti-corrosion performance of polyethylene can withstand various corrosions existing in the natural environment; 2. Has a high quality-price ratio; 3. Polyethylene has excellent insulation performance, and the electrical perfo...

What requirements should the weld repair of pressure steel pipelines meet

What requirements should the weld repair of pressure steel pipelines meet

Keywords :What requirements should the weld repair of pressure steel pipelines meet        Update : 2022-06-01        View(s) : 48

(1) Before repairing, analyze the causes of defects and propose corresponding repairing measures. (2) When repair welding is required for repair, the qualified welding process shall be adopted, and the welding shall be carried out by a qualified welder. (3) When the number of repairs for the sam...

Spiral tubes can be divided into several categories according to their use

Spiral tubes can be divided into several categories according to their use

Keywords :Spiral tubes can be divided into several categories according to their use        Update : 2022-05-30        View(s) : 47

There are roughly four types of spiral steel pipes according to their uses: drainage spiral steel pipes , dredging spiral steel pipes , piling spiral steel pipes , and oil and gas spiral steel pipes . Spiral steel pipe for drainage: Spiral steel pipe material for drainage: Q235A, ...

Forged flange production process

Forged flange production process

Keywords :Forged flange production process        Update : 2022-05-26        View(s) : 61

Forged flange production process The forging process generally consists of the following procedures, namely, selecting high-quality steel billets, blanking, heating, forming, and cooling after forging. Forging process methods include free forging, die forging, and fetal membrane forg...

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