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Material specifications: Round steel. Steel grade and technical requirements: Φmm – Q235-AG; B700-886, 8, 10, 12, 14, 16, 18, 20, 25, 28, 30, 36; 20 – GB/T699-99: 14, 16, 20, 25, 28, 30, 36, 38; 40, 45, 50, 55, 60, 70, 75, 80, 90, 100, 120, 140, 160, 180, 200, 220, 250, 300, 350; 25 – 22, 30, 32, 40, 50, 60, 70, 80, 90, 100, 120; 35 – 12, 16, 18, 20, 25, 28, 36, 40, 45, 50, 55, 60, 70, 75, 80, 90, 100, 120, 160, 180, 300; 45 – 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200, 240, 250, 300, 350; 12Cr1MoV – GB/T3077-99: 8, 12, 16, 18, 20, 25, 30, 36, 40, 45, 50, 55, 60, 70, 75, 80, 90, 100, 120, 140, 170, 220, 250, 300, 350; 15CrMo(A) – 28, 38, 42, 45; 25Cr2MoVA – 18, 26, 30, 40, 45, 50, 55, 60, 70, 80, 90, 100; 25Cr2Mo1VA – 20, 26, 30, 40, 45, 55, 90; 40Cr18 – 20, 30, 40, 50, 65, 85, 100, 120, 150, 200; 30CrMoA – 26, 28, 30, 36, 40, 45, 50, 55, 60, 70, 75, 80, 85, 90, 100, 120, 140, 160, 220, 250, 280; 38CrMoA1A – 20, 28, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 120, 150, 170; 1Cr13 – GB1220-92: 6, 12, 18, 20, 25, 30, 36, 40, 45, 50, 55, 60, 70, 80, 90, 120; 2Cr13 – GB1220-92, GB1221-92: 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 100, 120, 150, 250; 3Cr13 – 8, 10, 12, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 120, 150, 200; 1Cr18Ni9Ti – 10, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 120, 150, 180, 200; 20Cr1Mo1V1 – As per agreement: 20, 28, 40, 60, 80, 100, 150; 1Cr20Ni14Si2 – GB1221-92, 12, 35, 80; SA675Gr70; ASME210. Note: The types, specifications, and allowable tolerances for round steel are in accordance with GB702-1986.