Difference between LR DH69 and LR EH69 steel plate

Jan 26, 2026 Leave a message

LR DH69 and LR EH69 are both extra-high-strength shipbuilding steel grades certified by Lloyd's Register (LR) with a minimum yield strength of 690 MPa. The primary difference is their impact toughness: DH69 is tested at -20° C, whereas EH69 offers superior low-temperature toughness, tested at -40° C.

Chemical Composition

LR DH69 extra high Strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Al	N
LR DH69	0.20	0.55	1.70	0.030	0.030	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

LR EH69 extra high Strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Al	N
LR EH69	0.20	0.55	1.70	0.030	0.030	0.015	0.020
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02

Mechanical Property

LR DH69 extra high strength property
Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
LR DH69	mm	Min Mpa	Mpa	Min %	-20	J	J
	t≤50	690	770-940	16%		46	69
	50＜t≤70	690	770-940	16%		46	69
	70＜t≤100	690	770-940	16%		46	69
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

LR EH69 extra high strength property
Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
LR EH69	mm	Min Mpa	Mpa	Min %	-40	J	J
	t≤50	690	770-940	16%		46	69
	50＜t≤70	690	770-940	16%		46	69
	70＜t≤100	690	770-940	16%		46	69
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

Key Differences

LR DH69 vs. LR EH69 Impact Toughness Temperature:

LR DH69: Charpy V-Notch impact tests are performed at -20° C.

LR EH69: Charpy V-Notch impact tests are performed at -40° C, indicating superior performance in colder environments.

Application Environment:

DH69: Suitable for structural applications in cold environments.

EH69: Designed for extreme cold, such as polar-region ships and arctic applications, where higher resistance to brittle fracture is required.