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Regular specifications:12-280mm Applications:The steel bar used for making various kind of machinery,automobile,mining spare part mainly. 1,The round steel bar according standard,GB/T3077-1999 2,Unless otherwise specified in the contract ,the melting process shall be selected the producer himself 3,The steel bar products are usually delivered in the as hot rolled condition or the as forged condition. 4.There shall be no visible cracks,knots,lap and inclusions on the surface of the steel prudue for the pressure working use.The above defects,if any,must be removed.The remoing width shall be no less than 5 times of the depth.For the steel produce with the diameter or the side length more than 140mm,the locations of the Max removing depth shall not be more than 2 on the same one section.It is permitted that there exist very few fine scratches,dents,pits,which do not exceed one half of the size tolerance by counting from the actual size,and small cracks with the depth less than 0.2mm