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March 26, 2019

Characteristics for grade 20

Grade : 20 ( 20 ) Substitute: 15, 25 Classification : High quality structural carbon steel Chemical composition in % for grade 20 ( 20 ) C Si Mn Ni S P Cr Cu […]

February 14, 2019

Galvanized steel pipe specification, size theoretical weight table

China standard hot-dip galvanized steel pipe|cold galvanized steel pipe specification, size theoretical weight table regulation grid OD mm Wall thickness mm Minimum wall Welded pipe ( 6 m fixed length) Galvanized pipe ( 6 m fixed length) Nominal inner diameter inch Thick mm Meter weight kg Root weight kg Meter weight kg Root weight kg DN15 1/2 21.3 2.8 […]

January 12, 2019

STEEL PLATE AND STEEL PIPE FOR LINE PIPES

This is a §371 of International Application No. PCT/ JP2008/070726, with an international filing date of Nov. 7, 2008 (WO 2009/061006 Al, published May 14,2009), which is based on Japanese Patent Application No. 2007-290220, filed Nov. 7,2007, the subject matter of which is incorporated by reference. TECHNICAL FIELD This disclosure […]

January 10, 2019

What Is Black Steel Pipe ?

Black steel pipe is used in applications that do not require the pipe to be galvanized. This non galvanized black steel pipe acquired its name because of its dark coloured iron oxide coating on its surface. Because of the strength of black steel pipe , it is used for transporting […]

January 8, 2019

How is the theoretical weight of spiral steel pipe calculated?

The theoretical weight of steels is obtained by calculating nominal dimensions and density (which is called specific weight in the past). This is directly related with the steel length, the cross section area, and the allowable size deviation. Because of the allowable deviation in the process of manufacturing, the calculated theoretical weight […]

January 7, 2019

Corrosion Resistance of API 5L Pipeline Steel with Coating Protection

ABSTRACT The corrosion resistances of enamel-coated steel pipe in 3.5 wt% NaCl solution was evaluated and compared with those of epoxy-coated pipe using open-circuit potential, linear po- larization resistance, and electrochemical impedance spectros- copy tests. T-001c enamel slurry and GP2118 enamel powder were sprayed to steel pipe in wet and […]

January 4, 2019

Casing pipe application in high-temperature gas wells

In recent years, with the decreasing number of easily exploitable oil and gas wells, it has become necessary for oil and gas wells to go deeper on both underground and underwater. And, tubing and casing strings are subjected to higher temperature and higher pressure in these wells, which would probably […]

January 4, 2019

Properties of Galvanized Steel Pipe Welds

Properties of Galvanized Steel Pipe Welds Galvanizing has been used to protect iron and steel from rusting for over a hundred years in places as diverse as the wire rope used for the suspension cables on the Brooklyn Bridge to gutters on houses. Galvanizing is simply coating of zinc over […]

January 2, 2019

Why not galvanizing after welding for steel pipe

Why not galvanizing after welding Why not avoid the whole problem of welding galvanized steel pipe sheets after galvanizing? After all, steel products are always galvanized after manufacture, because there has been no practical way to restore the galvanizing effect after welding. Zinc plating after manufacture is still conventional, but […]