What is S690QL material hardness?

S690QL is a high strength quenched and tempered steel grade that complies to steel specification EN 10025. The designation S690QL refers to a minimum yield strength of 690MPa.

Standard:Hot-rolled product made from structural steel. EN 10025-6: Technical delivery conditions for high-tensile structural steel post-tempering and quenching.

Classification: High-grade structural steel.

Product:Fine-grain steel post-quenching and tempering.

Chemical composition of S690Q steel according EN10025-6, %

С	Si	Mn	P	S	N	B	Cr	Cu	Mo	Nb	Ni	Ti	V	Zr
0,20	0,80	1,70	0,025	0,015	0,015	0,005	1,50	0,50	0,70	0,06	2,0	0,05	0,12	0,15

Mechanical properties of S690Q steel

Nominal gauge, mm	Minimum yield strength, ReH (MPa)	Ultimate tensile strength, Rm (MPa)	Minimum elongation ratio σ, %	Brinell hardness number, HB (MPa)
>3≤50	690	770-940	14	228-278
>50 ≤ 100	650	760-930	14	225-276
>100 ≤ 150	630	710-900	14	210-266

Application of S690Q steel

S690Q steel is used in structures subject to extreme loads: mining and heavy-construction equipment, crane equipment, offshore drilling platforms, supporting structures for wind turbines, bridges and trestles.