The purpose of preheating the spiral steel pipe before welding(1) Preheating can slow down the cooling rate after welding, make hydrogen diffuse and escape in the weld metal, and avoid cracking caused by hydrogen. It can also reduce the degree of hardening of welds and heat-affected zones, and impro

The standard for storage of anti-corrosion steel pipes1. The appearance of the anti-corrosion steel pipe in and out of the warehouse needs to be inspected as follows:① Check one by one to ensure that the surface of the polyethylene layer is flat and smooth, and there are no dark bubbles, pits, wrink

Instructions for use and maintenance of straight seam steel pipesWhat is a straight seam steel pipe?Longitudinal seam steel pipe does not refer to a certain type of steel pipe, but a large type of welded pipe. It is made of steel strip. The steel pipe made by using the straight seam high-frequency w

Anti-corrosion method of oil casing1. To make sure that the water quality meets the standards, and strictly monitor and manage the water quality.Implement cleaning and separate injection, strengthen the cleaning of main water pipelines, ensure that the water quality in the station and the bottom of