ASTM A269 TP316/316L Stainless Steel Tube Seamless Heat Exchanger Tubes The bright-annealed bore is what separates this SKU from our pickled seamless and welded A269 options. Pickling leaves a matte surface around Ra 1.5–3.0 µm; bright annealing holds Ra ≤ 0.4 µm (16 µin) typical. In a shell-and-tube, U-tube or small-diameter exchanger this is measurable: fewer nucleation sites for deposit build-up, a lower fouling resistance after the first operating cycle, less pressure
It's genuine 321H — titanium-stabilized, so no worries about sensitization or intergranular corrosion during welding. Our welder said it welded nicely with no cracking.
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