How to judge the quality of spiral welded steel pipe1. From the surface of the spiral steel pipe, see whether the production process of the spiral steel pipe is superb. Generally, it is necessary to study and analyze spiral steel, and the cross-section of counterfeit spiral steel pipe is elliptical.
The cause and adjustment of uneven steel pipe wall thickness1. Uneven spiral wall thickness is caused by: the uneven wall thickness caused by the adjustment of the piercing machine's rolling centerline, the inclination of the two rolls, or the reduction of the front head is too small, generally alon
Inspection method of high frequency welded pipe1. Chemical composition analysis: chemical analysis method, instrumental analysis method (infrared C—S instrument, direct reading spectrometer, zcP, etc.).A. Infrared C-S instrument: Analyze the C and S elements in ferroalloys, steel-making raw material
Development status and prospects of domestic and foreign oil and gas pipelinesAn important driving factor for the development of oil and gas pipelines is the imbalance in the production and demand of oil and gas resources in various regions. Since the development of the oil and gas industry, most co
As oil and natural gas resources are often located in remote areas and harsh environments, greater pressure pipelines transporting, complex and corrosive media, and pipeline welding assembly ring general in the wild, which not only requires pipeline steel with high strength, and requirements should
Also known as spiral or helix spiral steel pipe, is a low-carbon steel or low-alloy structural steel strip at a certain helix angle (called molding angle) rolled into a tube, and the tube is made of welded joints It can be produced with a narrow strip of large diameter pipe. Classes of spiral steel
Threeway Steel is in the conventional austenitic stainless steel, based on strict control of impurities on components made further refined and improved composite - Diverse developed from strengthening means, is dedicated to a new supercritical unit boiler austenitic stainless steel . In this steel,
Seamless surface cracks, opening wide outside off who called the opening is narrow, are known as fine as hair hairline. This deficiency is mainly caused by genetic tube surface cracks, but also affect the rate of qualified products mainly seamless. Seamless billet surface cracks causes, with the pro
Seamless carbon steel pipe or solid steel ingot is made of the capillary tube through the hole, then through the hot-rolled, cold rolled or cold call is made. Seamless carbon steel pipe in China's steel industry has an important position. Seamless carbon steel pipe material is a round tube, pipe cut
SA214 Heat exchanger and condenser erw carbon steel pipeScopeThis standard applies to heat exchangers, condensers and similar heat exchanger and condenser erw carbon steel pipe with a minimum wall thickness. Usually provides steel pipe size outside diameter smaller than 3in (76.2mm), can also provid
