ASTM A312 TP304H Stainless Steel HFW Spiral Welding Finned Tube Heat exchanger Tube

Yuhong Group has been operating finned tubes for more than 10 years, with annual sales of more than 80,000 tons of stainless steel/duplex/nickel seamless tubes. Our clients have covered more than 45 countries. Our stainless steel seamless pipes are widely used in mining, energy, petrochemical, chemical, food mills, paper mills, gas and fluid industries and more.

Unlike 304L, Type 304H has a higher carbon content, making this steel more suitable for use in applications where high temperatures are present. It is an austenitic chromium-nickel steel alloy, and the higher the carbon content, the higher the tensile and yield strengths. Due to the thermal resistance of this grade, this material is recommended for ASME pressure vessels with operating temperatures above 815 °C.

The higher carbon content of 304H increases its strength, so 304H has greater ASTM A213 tensile and yield strengths than 304L. At temperatures up to 500 °C, 304H has greater short- and long-term creep strength than 304L, and 304H is more resistant to sensitization than 304L. In ASME pressure vessels used above 815°C, the carbon content of 304H must be 0.04% - 0.1%. 304H is required in such applications.

Alloy 304H is most commonly used in refineries. It is also used in boilers, heat exchanger tubes, condenser tubes, piping, cooling towers, steam discharge and stainless steel reheater tubes and superheater tubes in power plants. It is also found in fertilizers and chemical plants.

HFW finned tube is the abbreviation of high frequency welded spiral solid finned tube.

Spiral finned tubes offer designers high thermal efficiency and a compact design solution for a full range of heat exchangers using clean flue gas. There are two types of spiral finned tubes: solid type and serrated type.

Helical solid finned tubes are made by helically wrapping a continuous strip of fins around the tube. High frequency resistance welding typically uses a frequency of 400 kHz. The fins are wrapped around the tube and welded continuously. The fin tape is helically wound on the tube and continuously welded to the base tube along the root of the helix by a high frequency electrical process. The fin strips are held under tension and laterally constrained as they are formed around the tube, ensuring firm contact between the fin strips and the surface of the base tube. Using the gas metal arc welding process, the continuous welding is made at the point where the fin strip first begins to bend around the diameter of the pipe.

Technical details/base tube details/Fin details

Pipe Diameter: Min. OD 20mm to Max. OD 219mm.

Tube Thickness: Min. 2mm to 16mm

Tubing: Stainless Steel, Alloy Steel, Carbon Steel, Weathering Steel, Duplex Steel, Super Duplex Steel, Inconel, High Chromium High Nickel, and Incolloy Materials.

Fin detail

Fin Thickness: Min. 0.8 mm to max. 4 mm

Fin Height: 0.25" (6.35 mm) minimum to 1.5" (38 mm) maximum

Fin Density: Minimum 43 fins per meter, maximum. 287 fins per meter

Materials: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel and Incolloy.

If you need a quick quotation, please send as follows:

1.Number of pieces,

2.Base tube:

(1)Diameter, (2)Thickness, (3)Length and (4)Material specifications.

3.Fins:

(1)Material specification, (2)Type (solid or serrated), (3)Height, (4)Thickness, (5)Spacing, (5)Fin length and (6)Finless section.

If necessary, welding preparation details.

4.The delivery date required.

The fins are cut from metal strips and then helically wound around the tube. Others are the same as high-frequency welded solid finned tubes.

Important features of this configuration are efficiency, effective fin-to-tube bonding under all temperature and pressure conditions, and ability to withstand high temperatures on the fin side. This serrated fin configuration can withstand fin fouling even better if this is an issue in the application. This provides better heat transfer performance compared to solid fins.

Base tube details

Pipe diameter range: 15.88mm to 219mm

Tube thickness range: 1.651mm to 16mm

Tube Material: Carbon Steel Seamless Tube, Stainless Steel, Carbon Alloy Steel, Weathering Steel, Duplex Stainless Steel, Super Duplex Stainless Steel S32750, Inconel Alloy, High Chromium High Nickel Incoloy Alloy, CK 20 Material and some other materials.

Fin detail

Fin Thickness: Min. 0.8 mm to max. 4 mm

Fin Height: Min. 0.25" (6.35mm) to Max. 1.5" (38mm)

Fin Density: Minimum 43 fins per meter to maximum. 287 fins per meter

Materials: Carbon Steel, Stainless Steel, Alloy Steel, Weathering Steel, Duplex Steel and Incoloy Alloy.

Keywords: finned tube, finned tube, spiral finned tube, solid finned tube, serrated finned tube, spiral serrated finned tube, square finned tube, rectangular double H welded finned tube, high frequency welded spiral spiral Serrated finned tube

Application:
HVAC & Boilers
power plant
Heat recovery steam generator
Petrochemical industry
marine applications
Refrigeration applications
Economizer
Oil and Gas Coolers
Plumbing and Air Conditioning
Condenser and Evaporator
Shell and Tube Heat Exchanger
Various other heat exchanger applications