... 410 460 490 Carbon and carbon-manganese steel seamless pipe for ship-----American Petroleum Institute:Certificate of Authority to use ... 10#, 20#, 35#, 45#, ST45, ST55, CK45, Q235 (B, C, D, E), Q345 (B, C, D, E), 16Mn, 20Mn, 45Mn,27SiMn, 20G, 20Cr, ... to the business policy as" Quality for Servial, Product for Development, Credibility for Cooperationand Service for Customer.We are pleased to find new ...