Production process of spiral seam submerged arc welded steel pipe

most of the smaller diameter welded pipes adopt straight seam welding, and the large diameter welded pipes mostly adopt spiral welding.

The purpose of anti-corrosion of seamless steel pipes for low and medium pressure boilers is to prolong the service life of the steel pipes themselves. Especially when it is used in underground industrial pipelines, oil and gas transportation, high-quality water pipelines and other projects, anti-corrosion treatment is required.

Underheating, overheating, overburning, oxidation, and decarburization are the defects that steel is prone to appear when heating. So what kind of preventive measures should be taken?

What happens to the hardness of the seamless steel pipe after annealing? Increase or decrease?

The impact toughness of high-pressure seamless pipe reflects the resistance of metal to external impact load, generally expressed by impact work (Ak), and its unit is J (Joule).