The total heat transfer coefficient of a metal depends on other factors besides the thermal conductivity of the metal. In most cases, the heat dissipation coefficient of the film, the rust skin and the surface condition of the metal. Because stainless steel keeps the surface clean, it conducts hea

With the continuous development of oil and gas pipelines to large diameters and high pressures, spiral submerged arc welded steel pipes also continue to develop to large diameters, large wall thicknesses and high steel grades. The double wire submerged arc welding process is playing more and more in

1. The principle requirement of spiral steel pipe stacking is to stack according to varieties and specifications under the premise of stable stacking and ensuring safety. Different types of materials should be stacked separately to prevent muddling and mutual erosion;2. It is forbidden to store item

(1) Geometric standard inspection of steel pipeThe outer diameter, wall thickness, curvature, and length of the steel pipe can be inspected on the inspection table with an external caliper, a micrometer, a bending ruler, and a length tape measure.Automatic standard testing equipment (such as automat