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ASTM B444 GR.2 Alloy Steel U Bend Tube
Overview
ASTM B444 is the standard specification for nickel-chromium-molybdenum-columbium alloy (UNS N06625), seamless and welded tubes for general corrosion-resistant and heat-resistant applications.
The Benefits of ASTM B444 GR.2 U Bend Tube
1>.Corrosion Resistance: GR.2 alloy steel, also known as Titanium Grade 2, exhibits excellent corrosion resistance, especially in chloride-containing environments. This makes it suitable for applications where corrosion resistance is crucial.
2>.High Strength-to-Weight Ratio: Alloy steel GR.2 has a high strength-to-weight ratio, making it a lightweight yet robust material. This property allows for the design of sturdy heat exchanger systems while minimizing overall weight.
3>.Heat Transfer Efficiency: U bend tubes are known for their enhanced heat transfer capabilities. The curved shape of the tubes increases the contact surface between the fluid and the tube, facilitating efficient heat exchange.
4>.Wide Temperature Range: GR.2 alloy steel U bend tubes can operate effectively over a wide temperature range. They exhibit good mechanical properties and retain their strength even at elevated temperatures, making them suitable for high-temperature applications.
Chemical Composition of ASTM B444
| Grade | C | Mn | S | Si | P | Cr | Mo | Iron | Al | Ti | Cu | |
| N06625 | Min | 18.0 | 7.0 | 2.0 | ||||||||
| Max | 0.1 | 0.5 | 0.01 | 0.5 | 0.02 | 22.0 | 9.0 | 4.0 | 0.5 | 0.5 | 0.5 |
Mechanical Properies of ASTM B444
| Grade | Tensile Str Ksi(Mpa) | Yield Str Ksi(Mpa) | Elongation(%) |
| N06625 | ≥100(690) | ≥40(276) | ≥30 |
Tolerances on Cut Lengths of Light-Wall Tube
| Length,ft(mm) | Tube Size,in.(m) | Permissble Variations,in,(mm) | |
| Over | Under | ||
| Under 1(0.30) | up to 1.250(31.8),in | 1/32(0.8) | 0(0) |
| 1 to 4(0.30 to 1.22),incl | up to 1.250(31.8),in | 1/16(1.6) | 0(0) |
| Over 4 to 10(1.22 to 3.0),incl | up to 1.250(31.8),in | 3/32(2.4) | 0(0) |
| Over 10(3.0) | up to 1.250(31.8),in | 3/16(4.8) | 0(0) |
