|Bend Angle||180 degree|
|End Connection Type||Buttweld|
|Brand||UNIFIT METALLOYS INC|
|Size||1/4" to 1"|
|Country of Origin||Made in India|
U-bent tube sizes
|Tube Outside Diameter||Tube Wall Thickness||Bending Radius||U Tube Straight “Leg” Length||Straight Tube Before U Bending|
|min. 12,70 mm||min. 0,70 mm||min. 1,5 x D||max. 11 000 mm||max. 24 000 mm|
|max. 31,75 mm||max 5,16 mm||max. 1 250 mm|
Sizes tolerances of U bend tubes are to fullfil the requirements of: ASTM A556 / 556M and DIN 28179
Heat treatment of U bent tubes
Post bending heat treatment by electrical resistance (Joule effect) is applied. The temperature is monitored and controlled during the process. It is possible to perform the heat treatment in a nitrogen atmosphere.
U bent tubes can be tested as follows
All materials are hydro-tested as standard. Stress relieving is carried out in a gas-fired furnace or solution annealed using an induction heat process. We can offer a range of additional testing on request, including dye penetrant and PMI testing.
Cold Bending and Hot Bending.
After Cold Bending, the bending area needs heat treatment.
Material Comparison Tables (ASTM ???KS, JIS, DIN, BS, NBN, NF, UNI)
A 179 Seamless Cold Drawn Low-C Steel Heat Exchanger and Conderser Tubes
|KS/JIS Symbol||KS/JIS Numbe||Re||DIN Type|
|B.S Grade||Re||NBN Type||NBN Grade||Re||AF||NF||Re||UNI Type||UNI||Re|
|ASTM A179||K01200||STBH 340 / STB 35||D3563 / G3461||St 35.4||1629|
|3606||CFS 320||D 37-2||629||(3b)||TU 37 C||A49-215||(3a)||C 14||5462|
DIN 2391 Gutegard C.NBK