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O'qib bo?lmasi 4130 Seamsiz Tubing 2. 1 kemikali komposisi 2. 2 Mekanik xossalari 3. 4130 o?qib bo?lmasi Yashirish 3.1 bizing va davillik 3.2 Korrosion Resistance 3.3 ivaq va moslamali dizayni 4. dasturlar