Hot-Dip Galvanized Seamless Steel Pipe
Fin-tube radiator manufacturer
Hot-Dip Galvanized Round Pipe in Stock
40cr Steel Plate, Sales of Shandong 40cr Alloy Steel Plate
42crmo Steel Plate 42crmo Alloy Steel Plate
Liaocheng High-frequency Welded 304 Stainless Steel Finned Tube Manufacturer
Finned tube radiator, carbon steel finned tube
Product Details
Seamless steel pipes, finned pipes, precision steel pipes, cold drawn steel p...
产品Price 50.00/Please provide the Chinese content that needs to be translated into American English.
最小起订Quantity：1 Please provide the Chinese content that needs to be translated into American English. 供货总Quantity： 10000 Please provide the Chinese content that needs to be translated into American English.
Finned tubes, as heat exchange elements, operate under high-temperature flue gas conditions for extended periods, such as in boiler heat exchangers where the finned tubes are exposed to harsh environments—high temperatures, high pressures, and corrosive atmospheres. This necessitates that finned tubes possess high performance specifications. 1) Anti-corrosion properties 2) Wear Resistance 3) Low contact thermal resistancentact resistance) 4) High Stability 5) Dust Resistance Ability Inset spiral fins Spiral fin tubes with embedded fins are pre-machined with a certain width and depth of spiral grooves on the steel pipe, and then the steel strip is embedded onto the pipe on a lathe. During the winding process, due to a certain pre-tension, the steel strip is tightly clamped within the spiral grooves, ensuring a certain contact area between the steel strip and the steel pipe. To prevent the steel strip from rebounding and detaching, the ends of the strip must be welded to the steel pipe. To facilitate embedding, there should be a certain lateral clearance between the steel strip and the spiral grooves. If the clearance is too small, causing interference, the embedding process becomes difficult. Moreover, the wound steel strip will always have some degree of rebound, which results in poor contact between the steel strip and the bottom of the spiral grooves. Fins can be embedded on general-purpose equipment at a low cost, but the process is complex and production efficiency is low. Soldered Spiral Fin Tubes The brazed spiral fin tube manufacturing process is divided into two steps. Firstly, the steel strip is wrapped around the outer surface of the tube in a spiral manner, perpendicular to the tube's axis, with the ends of the steel strip welded to the steel tube for fixation. Then, to eliminate the gap at the contact point between the steel strip and the steel tube, brazing is used to join the steel strip and the steel tube together. This method is often replaced by another due to its high cost, which involves placing steel-banded pipes into a zinc bath for overall hot-dip galvanizing. While the galvanizing solution may not necessarily penetrate well into the gaps between the fins and the steel pipe, it forms a complete galvanized layer on the external surfaces of both. The spiral fin tube with overall hot-dip galvanizing, however, is still not highly integrated due to the limitation of galvanized layer thickness (thicker layers are less durable and prone to peeling off), and because the zinc liquid cannot fully infiltrate the gaps. Moreover, zinc has a lower thermal conductivity than steel (about 78% of steel's), resulting in reduced heat transfer capacity. Zinc is susceptible to corrosion in alloys and compounds, thus zinc-coated spiral fin tubes are not suitable for making air preheaters (for recovering waste heat from boiler flue gas). High-frequency Welded Spiral Fin High-frequency welded spiral finned tubes are one of the most widely used types of spiral finned tubes. They are now extensively applied in the waste heat recovery of power, metallurgy, and cement industries, as well as in the petrochemical sector. High-frequency welding spiral finned tubes are焊接 by utilizing the skin effect and proximity effect of high-frequency currents to heat the outer surfaces of the steel strip and the steel tube until they reach a plastic state or melt. The welding is completed under a certain pressure on the wrapped steel strip. This high-frequency welding is essentially a solid-state welding process. Compared to methods like insert welding, brazing (or integral hot-dip galvanizing), it offers superior quality in terms of product quality (with a high welding rate of fins up to 95%) and higher productivity and automation levels. Three-roll inclined rolling integral spiral fin tube Rolling Sloped Integral Spiral Fin Tube The production principle of a three-roll oblique rolling integral helical finned tube is as follows: A mandrel is inserted into the hollow tube, and through the rotation of the roller blades, the seamless steel tube is processed with fins on its outer surface through a cavity formed by the roller slots and core heads. This method produces finned tubes where the base tube and the external fins form an integral whole, eliminating the issue of contact thermal resistance loss, and boasting high heat transfer efficiency. Compared to the welding method, this production line offers advantages such as high production efficiency, low material consumption, and high heat exchange rate of the finned tubes produced. Three-roll oblique rolling integral spiral fin tube technology has been successfully applied to single fin tubes with copper or aluminum fins, or composite fin tubes, or low fin tubes made of steel; steel integral fin tubes are commonly seen as low fin tubes on the market, while integral high fin tubes are usually made of materials like aluminum or copper and are typically cold rolled.
