We bend lots of stainless, which in terms of hardness, is very similar to mild steel (a36/gr50/cq) If I were to start folding, I would use. I'll second that types of benders make a big difference. Our bend radius rule of thumb is the minimum radius material thickness. Occasionally it does alright, but I'm bending at radii on the edge of what will work. Stuff with a lighter gray (such as the German or asian) scale just ends up as waste in the scrap bin usually. I look for tubing with the darkest millscale, and for some reason, that stuff always works out the best. I have wondered if it could have anything to do with how evenly the tubing is annealed? I can tell by the mill scale right away which stuff is going to give me trouble. Without greasing, my rotary draw will not consistently bend any of it. Allowable working pressures are calculated from an S value of 184 MPa (26 700 psi) for ASTM B444 Grade 2 tubing at 28 to 37C (20 to 100F), as listed in ASME BPV 2007 Section II, Part D, Table 1B tubing outside diameter and wall thickness tolerances from ASTM B444for small-diameter tube. PEX SS Sleeve Tool The ApolloPex Combo PEX Stainless Steel Sleeve The. In all cases, I'm LIBERALLY greasing the tubing prior to bending. HTB-2000 TTMC Hydraulic Tube Bender Exhaust Pipe Bender 10 Ton Pressure Pipe. I bend thin wall tubing for bicycle frames, and for example, the 3/4 X.035" 4130 from overseas (Taiwan/China?) will not bend around a 3" CLR, the same type of tubing from Germany will, but with wrinkles, and the US tubing (from Plymouth?) will make the bend consistently. That said, I don't entirely understand any of it! I find that the quality of the tubing makes a substantial difference.
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