... be required7)Chemical composition &Mechanical PropertyStandardSteel GradeChemical Composition %T S MPaYSMPaElongation% CMnPS MINAPI-5LB0.271.150.030.0341324121 ... municipal heat supplySteel Grade1>GB/T 13793, GB/T 6728, GB 15831, SY/T 5040,CJ/T 3022Q195, Q215, Q235, ... Shipbuilding, Security Door Frames, Garage Doors, Strengthening Liners of Steel Doors and Windows, Indoor Partition Walls, Cable Bridge ...