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Cold Rolled Carbon Seamless Tubes Table 1- Chemical composition Steel Grade C% Si% Mn% P% S% St35 or E235 ≤0.17 ≤0.35 0.4-1.2 ≤0.025 ≤0.025 St45 or E255 ≤0.21 ≤0.35 0.4-1.1 ≤0.025 ≤0.025 St52 or E355 ...