Click to go to RathGibson home page
Skip Navigation LinksHome : Technical Information : Product Types : U-Bend Tubing

U-Bend header image

Our U-Bend Manufacturing Center allows us to increase efficiencies and reduce lead times, while maintaining the world-class quality for which we are known.

Specifications of U-Bend Tubing

RathGibson tubing and pipe are produced to dimensional tolerances and finish requirements of ASTM and ASME A 249/SA 249, A 688/SA 688, and A 803/SA 803 specifications.

Material Specifications:
Stainless Steel; Duplex Stainless Steel; Super Austenitic 6-Moly, 825, 904L, and Super Ferritic/Ferritic S44627, 439, 444, 446.

RathGibson U-Bend Tube Size General Guidelines for OD/Wall Combinations

  Wall Thickness
OD .035"
(.889 mm)		 .049"
(1.245 mm)		 .065"
(1.651 mm)		 .083"
(2.108 mm)		 .095"
(2.413 mm)		 .120"
(3.048 mm)
1/2"
(12.7 mm)
R/S
R/S
R/S
5/8"
(15.875 mm)
R/S
R/S
3/4"
(19.05 mm)
R/S
1"
(25.4 mm)		  

R = Redrawn   S = Seamless
Depending upon bend radius, some inner tube rows may require an increase in wall thickness
*Please note that these are guideline only.

Quality Testing

RathGibson performs extensive in-line QA testing including:
  • Eddy Current
  • Ultrasonic
  • Hydrostatic
  • Pressure Decay
  • Air Under Water After Bending

U-Bend Manufacturing Process

RathGibson's advanced capabilities include:
  • Laser Welding, Fully-Finished Tubing Mill
  • Drawing for High Pressure Feedwater Heaters
  • Stretch Straightener
  • Environmentally Friendly Bright Annealing
  • CNC Bending
  • Precision Stress Relief Anneal Station
  • Custom Stack-Rack Boxing

Advantages of RathGibson U-Bend Tubing

  • Repeatable and Predictable Tube Quality
  • Lower than 5,000 psi Residual Stress for SCC Susceptible Alloys
  • Significantly Lower Cracking Potential in the Shipped Product
  • Long Term Reliability

Markets

Download related literature