ASTM A269 & ASTM A312 – Chicago Tube & Iron
Over 24 feet add 1/8 inch per 10 feet to 1/2 inch maximum tolerance. Tubes not heat-treated to be stencilled: "HT-O". Tests per ASTM A269 and A450*. Flare for seamless tubes. Flange for welded tubes. Reverse flatten for welded tubes. Hardness: Rockwell B90 or BHN 200 maximum. Hydrotest: At 1000 to 4500 psi depending on diameter provided ...