ASME SA249 TP304 SS304 HF H Welding Finned Tube for Heat Exchanger
STANDARD | UNS | WERKSTOFF NR. | JIS | AFNOR | BS | GOST | EN |
SS 304 | S30400 | 1.4301 | SUS 304 | Z7CN18‐09 | 304S31 | 08Х18Н10 | X5CrNi18-10 |
SS 304L | S30403 | 1.4306/1.4307 | SUS 304L | Z3CN18‐10 | 304S11 | 03Х18Н11 | X2CrNi18-9 / X2CrNi19-11 |
Grade | 304 | 304L |
Tensile Strength (MPa) min | 515 | 485 |
Yield Strength 0.2% Proof (MPa) min | 205 | 170 |
Elongation (% in 50mm) min | 40 | 40 |
Hardness | - | - |
Rockwell B (HR B) max | 92 | 92 |
Brinell (HB) max | 201 | 201 |
HF Finned Tube For Heat Exchangers
HF Finned Tube is also known as high frequency welded spiral finned tube, high frequency welded spiral finned tube is a tubular high-efficiency heat transfer element with spiral fins. The extended surfaces (fins) can be solid or serrated and have up to tens of times more heat transfer area than a bare tube.
HF Finned Tube is a spiral winding of steel fins, which is continuously welded on the steel pipe by high frequency resistance welding (HFERW). A high-frequency current is introduced into the workpiece, the welding contact surface is melted or semi-melted by resistance heat, and then appropriate pressure is applied to the welding contact surface to complete the welding of the finned tube. This produces a uniform, clean and continuous finned tube combined with no additional welding material for very efficient heat flow and corrosion resistance.
High-frequency welded spiral finned tube is one of the most widely used spiral finned tubes.
HF Finned Tube Quick Details
Core tube material:
1. Carbon Steel: A106 / A179 /A192 / A210 etc...
2. Stainless Steel: TP304/304L,TP316/TP316L, TP347 etc...
3. Alloy Steel: P5,T5,P9,T9,T11,T22
Fin Material:
1. Aluminum (Alu.1100, Alu.1060)
2. Copper
3. Steel
Tube/Pipe Size 1.00″ to 15.75″ OD
Fin Height 0.3mm to 49.50mm
Fin Segment Width 5/32″ or 5/16″
Fin Thickness 0.8 mm ~ 4.0 mm
Fin Pitch 1 to 20 fins per inch
Surface Protection: Both bare ends shall be zinc or aluminum metallized by electrospray arc system coating.
Accessories: Tube support boxes, clamps or spacer boxes (materials: aluminium, zinc and stainless steel).
Manufacturing Process
HF Finned Tube is a spiral winding of steel fins, which is continuously welded on the steel pipe by high frequency resistance welding (HFERW). A high-frequency current is introduced into the workpiece, the welding contact surface is melted or semi-melted by resistance heat, and then appropriate pressure is applied to the welding contact surface to complete the welding of the finned tube.
Quality Control for HF Finned Tube
The quality of the HF Finned Tube is assured by hydrostatic or pneumatic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and the outer fins.
Features of HF Finned Tube
1. Due to the fast welding speed and strong self-cooling effect of the weldment, not only the heat affected zone is small, but also oxidation is not easy to occur, so the structure and performance of the weld are very good.
2. Anti-corrosion performance, wear-resistant performance, low contact thermal resistance, high stability, and anti-fouling ability.
3. Large heat exchange area.
Application
HF Finned Tube (high frequency welded spiral finned tube) is one of the most widely used spiral finned tubes, and is now widely used in power, metallurgy, waste heat recovery in cement industry, petrochemical industry and other industries.
