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astm a335 p92 high pressure boiler pipes 02

China technical requirements for seamless steel pipes for high pressure gas cylinders

The steel material for the high-pressure gas cylinder is a kind of dead steel without aging, which is usually melted by an alkaline open hearth furnace, an electric furnace and an oxygen blowing alkaline converter, and some kinds of steel must be melted by electroslag or vacuum.

Some problem about 4130 chromium-molybdenum steel welding

Due to its high impact strength and low elongation, 4130 Cr-Mo steel is widely used in sports equipment such as aircraft samples, racing car frames, anti-roll frames, dune bums, bicycles and motorcycles.

What is the effect of alloying elements in steel pipes?

Alloy steel is a steel that has small amounts of one or more elements (in addition to carbon) such as manganese, silicon, nickel, copper, chromium and molybdenum in addition.

What are the materials of thick-walled alloy tubes?

The performance of alloy pipe is much higher than that of general seamless steel pipe, because this steel pipe contains more Cr, and its high temperature resistance, low temperature resistance, corrosion resistance is not comparable to other seamless steel pipes, so alloy pipe is widely used in petroleum, chemical, electric power, boiler and other industries.

Process flow of seamless pipe

In both the manufacturing methods, raw steel is first cast into a more workable starting form (hot billet or flat strip). It is then made into a pipe by stretching the hot steel billet out into a seamless pipe or forcing the edges of flat steel strip together and sealing them with a weld.

What factors can affect the heat transfer effect of finned heat exchangers?

Many equipment will have high temperature after long-term operation, and if you do not use a finned heat exchanger to dissipate heat, some of the performance of the equipment will be affected, so the quality of the finned heat exchanger can determine the efficiency and life of the equipment.

What are the advantages of the overall spiral finned tube?

The spiral fin tube is very efficient in heat exchange, and the heat dissipation area is very large

What are the factors that affect the effect of finned radiators?

Finned radiators are indispensable heating equipment in today's family life, and many families choose to use this radiator for a better living experience.

What are the close joining methods of the string process of finned tubes?

Because the string tube is to string the fins to the tube piece by piece, because the tube is often not round (especially welded steel pipe), there will inevitably be a gap between the fin and the tube wall. If there is a gap, there is a gap thermal resistance, so the following close connection measures are often used.

The two best ways to check whether finned tubes are of acceptable quality

Finned tube is a kind of heat exchange tube, the main function is to improve heat exchange efficiency, usually on the surface of the heat exchange tube by adding fins