ASTM A179  U Bend Steel Tube for heat exchanger

Tubes are heat treated after the final cold draw pass at a temperature of 1200℉(650℃) or higher, used for Mechanical purposes ,involving machining or heat treatment,to reach good tolerance ,smooth surface , good perfromace on Mechanical properties.

U-Tubes size:

Technical conditions:

Heat treatment:Stress relive annealing of U-tubes after bending
Surface condition Finished U-tubes shall be free of scale, without scratches after bending
Dimensional tolerances U-tubes acc. to TEMA R.C.B.
Length of straight part -0/+5 mm 
Flattening (also called “ovality”) at the bend shall not exceed 10% of the nominal tube outside diameter.
Wall thickness in bending part acc. to TEMA RCB 2.31 
Minimum tube wall thickness in the bend part (T min)
T(min) ≥ (SW × (2×R + D))/( 2× (R+D)
where: SW is smallest wall thickness
D Nominal outside diameter
Radius tolerance 

1) for R 100 mm +/- 3 mm
2) for R ≥ 100 mm +/- 5 mm

Straightness tolerance max. 1,5 mm per 1 m

U-Tube ends: plain, vertically cut to the tube axis

Applications 

ASTM A179 low carbon seamless tube is for tubular heat exchangers,condensers,and similar heat transfer apparatuses ,also used for Boilers,Superheaters ,Shell & Tube Heat Exchangers,Feedwater Heaters,Condensers,Evaporators.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.

                                                  Heat transfer Apparatuse

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