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ANSWER: GMW3399 is the specification covers the requirements for continuous cast, hot rolled or cold rolled steel sheet with specified tensile strength from 450MPa through 1700MPa.
GMW3399 CR780T/420Y-DP is cold rolled uncoated and coated steel coil or sheet , dual phase(ferrite+martensite) (DP) quality.
CR780T/420Y-DP is dual phase quality steel. The delivery condition of CR780T/420Y-DP steel can be common cold rolled( non coated), and Hot galvanized (coated).
“CR” means cold rolled, “780T” means min tensile strength is 780MPa, “420Y” means min yield strength is 420MPa.
The exact mechanical property requirements of CR780T/420Y-DP is : Yield strength: 420-550 MPa, tensile strength is 780-900MPa, total Elongation in 80mm is min 14%, n value (4%+6%) is min 0.15, BH2 is min 30MPa
