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%,

Steel pipe is the most widely used gas pipe project. Its main advantages are: high strength, good toughness, bearing stress, impact resistance and tight, good plasticity, easy welding and thermal processing, the wall thickness is thinner, saving metal. But its poor corrosion resistance need to have

Seamless pipe is a hollow cross section, no seams round, square, rectangular steel. Seamless steel ingot is made of perforated or solid tube capillary tube, and then by hot-rolled, cold-rolled or cold-call is made. Seamless hollow sections, a large number of channels for transporting fluids, steel p

SA-106 Gr.B is a carbon–manganese steel intended for various high temperature service applications such as feed-water reducers in Pressurized Water Reactors, liquid ammonia transport from ammonia heater to urea reactor, drain lines in power reactor components, and feeders for carrying out the Primar

The pressure welded steel pipe consists of pipe, pipe fittings which include elbow, tee joint, taper pipe and other fittings, valve, flanged joint (flange, spacer as well as bolts), and these composition pieces are generally standard components, which can be fully decided by several factors such as

Capillary rolling is the main deformation process of hot-rolled seamless steel pipe production, its role is to make the capillary wall thickness of the pipe wall thickness near or at the finished product, and the elimination of longitudinal wall thickness of the capillary produced during piercing an