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Alloy steel grade T5 T9 T11 T12 T22 Alloy steel pipe Heat-Exchanger Steel Tubes SA213 Steel Grade C Mn P S Si Cr Mo max max max max max min T5 0.15 0.30-0.60 0.025 0.025 0.5 4.0-6.0 0.45-0.65 T9 0.15 ...