Steel pipe derusting methods:Tools derusting Mainly use tools such as steel wire brush for surface grinding; it can remove loose or cock of oxide skin, rust, welding slag etc. the effect of Manual tools can achieve Sa3 level, and derusting power tool can achieve Sa3 level. If the oxidized scale adh

Inner diameter of seamless steel pipe is more than 6.0mm and wall thickness is less than 13mm annealed seamless steel pipe material, which can be used W-B75 Webster Hardness test with very fast, easy, suitable for rapid non-destructive of the seamless steel pipe material qualified inspection. Inner

Requirements on pipe billet for hot-rolled seamless tube is related to and pipe varieties, uses and piercing methods. For general-purpose steel pipe tube quality requirements can be relaxed more, but the quality of important applications of tube steel and high-alloy steel pipe requirements must be s

The preheating is total or partial heated during welding work. Usually using medium carbon steel, high carbon steel weldment quench cracking tendency or temperature lower ground conditions, a large difference when welding, as well as the thickness of the weldment need to warm up. purpose of preheati

Stainless steel seamless pipe cracks principleCrevice corrosion is a form of localized corrosion crack in the surface sediments or shielded area surface passivation layer destruction. The processing or design cracks in the welding of stainless steel pipe fittingsmouth at the other junction. In effec

Pre-precision welding technology is the world's the most advanced technology in large diameter spiral pipe production, also known as the two-step production. The principle is the first step in the pre-welding technology produced fine spiral welding, that is, on a three- roll strip molding machine wh

With the development of the national economy, all kinds of seamless steel pipes are widely used in petrochemical, boiler manufacturing industry, especially the harsh working conditions such as high temperature, high pressure, seamless steel pipe quality higher requirements. Seamless steel pipe gener

There is a diameter ranging phenomenon in the cross section of round pipe, that there is not necessarily perpendicular to the maximum diameter and the minimum diameter, the maximum diameter and the minimum diameter of the difference is the ellipticity (or roundness). In order to control ovality, and

Storage method of spiral welded pipe is as follows:1 The place where custody spiral steel pipe venues or warehouse, should be selected in a clean, smooth drainage away from the produce harmful gases or dust factories and mines. The presence on the ground to clear the weeds and all the debris, keepin

Black steel pipe used for conveying fluid and solid, not only to exchange heat, manufacturing machinery parts and container, it is also a kind of economic steel. With black steel pipe manufacturing space truss structures, pillar and mechanical support, can reduce light weight, saving metal 20 ~ 40%,