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Low alloy u bent tube

Low alloy U bent tube is a type of tubing that is made from low alloy steel and is bent into a U shape.

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Description

Low alloy U bent tube is a type of tubing that is made from low alloy steel and is bent into a U shape.

Standard for Low alloy U bent tube

The semi-finished product for U bend tubes are heat exchanger tubes, manufactured and supplied according to DIN 28180 and ASTM A179.

Tubes for heat exchangers are made of steel according to:

Standard Application
ASTM A179 Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes
ASTM A192 Seamless Carbon Steel Boiler Tubes for High-Pressure Service
ASTM A210 Seamless Medium-Carbon Steel Boiler and Superheater Tubes
ASTM A213 seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A334 Seamless Steel Pipe for Low-Temperature Service and other Applications with Required Notch Toughness
JIS G3461/2 carbon steel tubes used for heat exchange in boilers, heat exchangers, condensers, and similar equipment
EN10216-1/2 specified the standard of cold processed precision steel tubes in a wide range of sizes
DIN17175 seamless tubes for high-pressure and high-temperature applications, specifically for boilers and heat exchangers

Chemical Composition and Mechanical Properties (Part)

Standard Grade Chemical Components (%) Mechanical Properties
C Si Mn P S Mo Cr V T.S.  (Mpa) Y.S.  (Mpa) E.L.
(%)
Hardness
(HRB)
ASME SA179 SA179 0.06-0.18 / 0.27-0.63 ≤0.035 ≤0.035 / / / ≥325 ≥180 ≥35 ≤72
ASME SA192 SA192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 / / / ≥325 ≥180 ≥35 ≤77
ASME SA210 A1 ≤0.27 ≥0.10 ≤0.93 ≤0.035 ≤0.035 / / / ≥415 ≥255 ≥30 ≤79
C ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 / / / ≥485 ≥275 ≥30 ≤89
ASTM A333 /A334 GR.1 ≤0.30 / 0.4-1.06 ≤0.025 ≤0.025 / / / ≥380 ≥205 ≥35 -45°
GR.6 ≤0.30 ≥0.10 0.29-1.06 ≤0.025 ≤0.025 / / / ≥415 ≥240 ≥30 -45°
GR.8 ≤0.13 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 / / 8.40-9.60 ≥690 ≥515 ≥22 -195°

U bend tubes for heat exchangers applied mostly in oil and gas plants, chemical and petrochemical plants, refineries, power plants and renewable energy plants. Low fin tubes can be supplied in the form of U bends.

U-Bend Fabrication Tolerances

U-bend tubes are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

U bend tube drawing
Item Condition (when) Tolercance
 Ovality Nominal bend radius ≤ 2 x nominal OD less than or equal to 12%
2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD less than or equal to 10%
Nominal bend radius > 4 x nominal OD less than or equal to 5%
Nominal bend radius ≤ 2 x nominal OD 0.75 x nominal wall
Mimimum wall thickness 2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD 0.8 x nominal wall
Nominal bend radius > 4 x nominal OD 0.9 x nominal wall
Nominal bend radius ≤ 8″ (200mm) +/-3/64″(1mm)
Bending Radius 8″ (200mm) < Nominal bend radius ≤ 16″ (400mm) +/-1/16″(1mm)
Nominal bend radius >16″ (400mm) +/-5/64″(1mm)
Disrance between legs Max 1/16″(1.5mm)
Wall thinning of bending area Max 17%
Difference between leg lengths at the ends Leg length ≤ 16′ (4.88m) +1/8″(3mm)
Leg length > 16′ (4.88m) +3/16″(5mm)
Deviation from plane of bend ≤ 3/16″(1.5mm)
Flattening on bend ≤ 10% nominal diameter
Straight leg length ≤5m +1/8″(3mm)
>5m +3/16(5mm)
Total tube length including radius ≤6m +3/16(5mm)
>6m +5/16″(8mm)

The purpose of the U bend in the tube is to allow for easy installation and routing of fluid or gas in a piping system, without the need for additional fittings or connections. Low alloy steel is used in these tubes because it has a lower cost compared to stainless steel, and is suitable for applications where corrosion resistance is not critical. These tubes are commonly used in industrial, oil and gas, and petrochemical industries for heat exchangers, boilers, and condensers.

Low alloy U-bent tubes are a type of heat exchanger tube that are made from low alloy steel and are bent into a U-shape to fit into heat exchanger units. They are designed to withstand high temperatures and pressures, making them ideal for use in industrial applications.

Measuring, cutting, deburring and cleaning of U bent tube

  • U-bend pipes are measured exactly in accordance with relevant standards.
  • All U bend pipes are cut to the specified leg lengths, ends are deburred and the u bend tubes are internally cleaned with air.
  • Before packing, both ends of U-bend pipes are capped with plastic caps.

U bending tube is carried out by cold working method and is being done to the necessary bend radius as per client drawings. U-bend tube/pipe can be manufactured from an extensive range of pipe materials that contain high and low yield stainless steels, alloy steels, carbon steels,Monel , Inconel, hastelloy,duplex , super duplex,titanium,copper alloy and Cr-Ni alloys. Usually U-bends manufactured from seamless tube, can further be customized in terms of thicknesses and sizes as per the specific requirements of our clients. They are easy for further assemble tube bundles.

Low alloy U bent tube drawing

We provide U bend Tubes pipe in diverse industries for a range of applications such as in Boiler, Condensers, Super Heaters,tube bundles for Heat Exchangers, Coolers/Inter-coolers, Chiller, and so on. These are as well being used in dissimilar industries such as in Fertilizer Plants, Sugar Industry, Steel Plants,Oil & Gas plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants etc.