What is EN 10025-6 S690QL equivalent ASTM steel

S690QL steel is high yield strength structural steel, and it is produced in compliance with EN 10025-6 standard. EN 10025-6 S690QL steel is usually heat treated using quench and temper techniques. What is EN 10025-6 S690QL equivalent ASTM steel? A709 grade 100 material is usually considered the EN 10025-6 S690QL equivalent ASTM steel. Besides, S690QL equivalent ISO steel is E690.

EN 10025-6 S690QL steel chemical composition:

EN 10025-6	C	Si	Mn	P	S	N	B	Cr
S690QL	0.20	0.80	1.70	0.025	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

EN 10025-6 S690QL equivalent ASTM steel A709 grade 100 chemical composition:

ASTM A709

C max

Si max

Mn

P max

S max

Cu min

V max

Nb

Ni max

Cr max

Mo max

Al min

N

A709 grade 100

0.26

0.4

0.4-0.9

0.04

0.05

EN 10025-6 S690QL steel mechanical property:

Designation		Mechanical Properties (ambient temperature)
Grade	Steel Number	Min. Yield Strength Reh MPa			Tensile Strength Rm MPa			Min. % elongation after fracture
		Nominal thickness (mm)			Nominal thickness (mm)
		≥3 ≤50	≥50 ≤100	≥100 ≤150	≥3 ≤50	≥50 ≤100	≥100 ≤150
S690QL	1.8928	690	650	630	770/940	760/930	710/900	14

EN 10025-6 S690QL equivalent ASTM steel A709 grade 100 mechanical property:

ASTM A709	Yield Strength (MPa) min.	Tensile Strength (MPa) min.	Elongation in 8 in. min. %	Elongation in 2 in. min. %
A709 grade 100	690	760-895	-	18

From above tables about chemical composition and mechanical property of EN 10025-6 S690QL steel and EN 10025-6 S690QL equivalent ASTM steel A709 grade 100, we can see the strength of S690QL steel and EN 10025-6 S690QL equivalent ASTM steel A709 grade 100 are close but not totally same. So even they are equivalent, they can not replace each other arbitrarily.