Hot Rolled Q690 HSLA Steel Plate

Q690 is a kind of low alloy high-strength structural steel, which consists of Q+number+quality grade symbol+deoxygenation method symbol.The "Q" in Q690 stands for the yield point of the steel, and "690" indicates the yield point value in MPa.For example, Q690D indicates that the yield stress (σs) is 690 MPa, and the grade is D structural steel. Q690D indicates that the yield stress (σs) is 690 MPa, and the grade is structural steel of grade D. The commonly used grades of Q690 are D and E. The grade of Q690 is also available in the following grades.

Q690D High Strength Low Alloy Steel Plate Chemical Composition:

Grade	Chemical requirement or element Max %
	C	Si	Mn	P	S	Cu	Cr	Ni	Mo	B	V	Nb	Ti
Q690D	0.2	0.8	1.7	0.025	0.015	0.5	1.5	2	0.7	0.005	0.12	0.06	0.05

 
Q690D High Strength Low Alloy Steel Sheet Mechanical Property:

		Q690 Yield Strength (≥N/mm2); Thickness or Dia. d (mm)
Standard	Steel Grade	Quality	d≤16	16	40	63
GB/T 1591 – 2008	Q690	C, D, E	690	670	660	640
GB/T 1591 – 2018	Q690M	C, D, E	690	680	670	650

			Q690 Tensile Strength (N/mm2); d (mm)			Elongation
Standard	Steel Grade	Quality	d≤40	40	63	%
GB/T 1591 – 2008	Q690	C, D, E	770-940	750-920	730-900	≥14
GB/T 1591 – 2018	Q690M	C, D, E	770-940	750-920	730-900	≥14