Shanghai GaoGao Company is one of biggest high manganese steel supplier in China. Product line includes Mn13、X120Mn12、ZGMn13。Steel plate products are both normal standard and special standard. The normal standard thickness is 6mm ~ 30mm. according to your special require, 1.0mm thickness or 100.00mm thickness of steel plate can be offered. Square steel can be rolled based on order, round steel is in stock but quantity is limited. Act for customers in order for forward contract. Please contact me for further information.