Q390 Steel, Q390A, Q390B, Q390C, Q390D, Q390E Equivalent Q390 Steel Introduction and Specifications. Q390 steel is a Chinese steel grade of Low Alloy High Strength Structural Steel, Yield Strength is 390 MPa, parameters are tested with 16mm diameter steel bars or steel plates, tensile strength is 470630 Mpa, material density is 7.85 g/cm3. According to GB/T 15912018, Q390 has 3 quality levels: Q390B, Q390C, Q390D.
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