Seamless ( CARBON SMLS) Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube. The seamless pipe is then finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 34 inch OD.

Pipe cap is widely used in nuclear power, chemical, food, pharmaceutical and other industries, the head of pressure vessel is a mechanical element, element is under pressure.

The aim of the present work is to quantify the seam weld properties, including both weld metal and heat affected zone regions, for a series of double-submerged-arc welded pipe, and the base metal and bondline regions for an electrical resistance welded line pipe steel. The chemical composition, micro structure, microhardness, tensile properties, Charpy impact toughness and J-integral/crack-tip opening displacement fracture resistance were characterized for linepipe produced between 1953 and 1981.

LSAW steel pipe was invented in 1940, a new welding method, welding hand in front of it and the same place it is to protect the use of slag, but this residue is not a skin electrode medicine.

ASME B36.10M-2004 Standard covers the standardization of dimensions of welded and seamless wrought steel pipe for high or low temperatures and pressures. The word pipe is used, as distinguished from tube, to apply to tubular products of dimensions commonly used for pipeline and piping systems. Pipe NPS 12 (DN 300) and smaller have outside diameters numerically larger than their corresponding sizes. In contrast, the outside diameters of tubes are numerically identical to the size number for all sizes.

DSAW pipe can be specified in very large diameter and to exact inside or outside dimensions.

When welding long cracks and surfacing layer, it is necessary to weld from one end to the other end. During welding, the weld and surfacing layer are in hot state, which can reduce the shrinkage of the weld and reduce the internal stress. When knocking, the effect is better when the welding metal temperature is 800 ℃. If the temperature drops, the knocking force will also be reduced. If the temperature is too low, it is not allowed to knock around 300 ℃ to avoid cracks, The principle of forging method is basically the same as above, but the difference is that the weldment should be heated before hammering.

What is welding crack? Welding crack is a common serious defect in welding parts. Under the brittle factors such as welding stress, the bonding force of metal atoms in the local area of the welding joint is damaged, resulting in the gap caused by the new interface. Its characteristics are sharp gap and large aspect ratio. The crack affects the safe use of the welding parts. It is a very dangerous process defect. The welding crack has a certain incubation period, Some are produced during reheating after welding.

As the name implies, the main constituents of welded steel pipe is steel and carbon. Because of to the composition of these pipes, they are nicely suited for commercial and geothermal applications due to the reality of the tensile power they offer. These pipes are seamless and for that reason confirm to be of outstanding electricity as essential oil pipelines or as transporters of other fluids.

Classification of welded joints Welded joints is constituted by weld fusion zone, heat affected zone and its adjacent base metal. Welded joints is mainly from two aspects, one is connected to the role, another is power transmission.

Hydrostatic test is necessary to ensure the quality of welded pipe production equipment. Currently, the market is on the market pipe hydrostatic testing machine working process: feeding, clamping, filled with water, pressure, pressure, pressure relief, the material.

Extrusion method refers to the metal blank into the extruder barrel, extrusion molding and extrusion rod composed of "closed" container by applying pressure to force the metal extruded rod extrusion die orifice outflow from, and access to metal plastic molding the method, which is a historic seamless manufacturing methods