Difference between S690Q and S890Q steel plate

S690Q and S890Q are high-strength, quenched & tempered structural steels (EN 10025-6), differing mainly in their specified minimum yield strength: S690Q offers 690 MPa, while S890Q provides a significantly higher minimum of 890 MPa, making S890Q stronger but requiring careful welding due to its greater strength, though both offer good toughness for demanding structural applications like heavy machinery and bridges.

Chemical composition and mechanical properties

Grade		S690Q Chemical composition
Grade		C	Si	Mn	P	S	B	Cr	Cu	Mo	Nb	Ni	Ti
S690Q		0.22	0.86	1.8	0.03	0.017	0.006	1.6	0.55	0.74	0.07	2.1	0.07
		S690Q Mechanical properties MIN
		Yield strength (Mpa)			Tensile strength (Mpa)				Elongation %
	TH(MM)	>3≤50	>50≤100	>100≤150	>3 ≤50	>50≤100	>100≤150		14
		690	650	630	770-940	760-930	710-900		14

S890QChemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	N	B	Cr
S890 Q	0.20	0.80	1.70	0.020-0.025	0.010-0.015	0.015	0.005	1.50
	Cu	Mo	Nb	Ni	Ti	V	Zr
	0.50	0.70	0.06	2.0	0.05	0.12	0.15

Grade	S890Q Mechanical Property
Grade	Thickness	Yield	Tensile	Elongation	Min Impact Energy
S890 Q	mm	Min Mpa	Mpa	Min %	-20	30J
	3	890	940-1100	11	-20	30J
	50	830	880-1100	11	-20	30J
	100	800	820-1000	11	-20	30J

S690Q

Yield Strength: Minimum 690 MPa (MegaPascals).

Applications: High-strength structural parts, heavy machinery (excavators, loaders).

Properties: Excellent strength-to-weight ratio, good impact toughness at low temperatures, good weldability and formability.

S890Q

Yield Strength: Minimum 890 MPa.

Applications: Similar to S690Q, but for even heavier loads where maximum strength is needed.

Properties: Higher strength than S690Q; generally supplied with good toughness and weldability, but requires adherence to specific welding procedures (like EN 1011-2) due to its higher strength.