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ANSWER: GMW3399 is the specification covers the requirements for continuous cast, hot rolled or hot rolled steel sheet with specified tensile strength from 1200MPa through 1700MPa.
GMW3399 HRMS1200 is hot rolled uncoated and coated steel coil or sheet , Martensitic (MS) quality.
HRMS1200 is Martensitic quality steel. The delivery condition of HRMS1200 steel can be common hot rolled( non coated), and Hot galvanized (coated).
“HR” means hot rolled, “1200T” means min tensile strength is 1200MPa, “1030Y” means min yield strength is 1030MPa.
The exact mechanical property requirements of HRMS1200 is : Yield strength: 1030-1150MPa, tensile strength is Min 1200 MPa, total Elongation in 80mm is min 5%,