knowledge

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 relates to a high-strength steel plate for line pipes, which is used for transportation of crude oil, natural gas or the like and which is excellent in anti hydrogen induced cracking (hereinafter referred to as HIC resistance), and to a steel pipe for line pipes produced by the use of […]
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 electrostatic processes, respectively. The phase composition and microstructures of the two enamels were characterized with x-ray diffraction and scanning electron microscopy (SEM). The surface roughness of enamels and their bond strength with steel substrates were quantified to understand coating quality. SEM images revealed that both types of enamel coatings have […]
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 cause casing failure or gas leakage in the high-pressure/high-temperature (HPHT) wells. Hence, more attention has been paid to wellbore integrity in oil and gas industry in recent years.1,2 The key factor of wellbore integrity is casing string connections, which are expected to provide both structural and leakage integrity under severe environment. […]
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 steel. Like paint, galvanizing protects steel from rusting by forming a barrier between the steel and the environment, but galvanizing goes one giant step further than paint — it also provides electrochemical protection of the steel. Since zinc is electrochemically more reactive than steel, it oxidizes to protect the steel […]
January 2, 2019

Why not galvanize after welding for steel pipe

Why not galvanize 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 must be done with great care. The manufacturing must be cleaned in acid, the acid must be neutralized, and then made into a liquid zinc can that must be immersed in excess of 900 °F. People must be very careful to make it dry when it is put into zinc, […]
November 27, 2018

What is threaded flange and what is its usage?

What is threaded flange and what is its features? A threaded flange is a type of flange that is threaded to the pipe. Designed with a loose flange. Threaded flanges are made by machining the inner bore of the flange into a pipe thread and connecting it with a threaded pipe. It is a non- welded flange . It welded flange or welded flange, compared with the threaded mounting flange, convenient maintenance, the line can not be welded in some field of use. Alloy steel flanges have sufficient strength, but are not easy to weld, or the welding performance is […]
October 28, 2018
API 5CT N80-Q Seamless Casing Steel Pipes

How is seamless steel pipe produced?

Hot rolling seamless pipe production process: 1. Introduction to seamless steel pipe The seamless steel pipe is a circular, square, rectangular steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical […]
October 26, 2018

ASTM A312 Gr. TP316L Stainless Steel Welded Pipe

An ISO 9001:2008 certified company, Victor Steel supplies a wide range of ASTM A312 TP 316L Stainless Steel Seamless Pipe to customers across world.Our focus is on providing customers with high end steels that are not rolled or stocked locally.We are leading ASTM A312 TP 316L Stainless Steel Seamless Pipe manufacturer in Mumbai, Maharashtra Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). There is commonly no appreciable price difference between 316 and 316L stainless steel.victor Steel is leading […]