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1. Base Tube Material: SA209 Composition: Carbon (C) 0.10–0.20% Manganese (Mn) 0.30–0.80% Phosphorus (P) ≤ 0.025% Sulfur (S) ≤ 0.025% Silicon (Si) 0.10–0.50% Molybdenum (Mo) 0.44–0.65% Copper (Cu) ≤ 0...