Difference between LR EH69 and LR DH69 steel plate

Dec 31, 2025 Leave a message

LR EH69 and LR DH69 are types of extra-high strength shipbuilding steel plates approved by Lloyd's Register (LR), used in marine structures, with EH69 and DH69 signifying different strength levels, often around 690 MPa tensile strength, crucial for heavy-duty applications where strength and toughness are key, unlike standard A/B/D/E grades.

Chemical Composition

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

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

Mechanical Property

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

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

Key Characteristics & Differences:

Issuer: Both are certified by Lloyd's Register (LR), a major classification society for marine vessels and structures.

Strength Level: They represent higher strength categories than basic shipbuilding steels (A, B, D, E).

EH69 (Extra High Strength): Indicates a higher strength level, often with minimum tensile strength around 690 MPa (MegaPascals).

DH69 (High Strength): Also indicates high strength, potentially slightly different from EH69, but still in the extra-high strength range for marine engineering.

Applications: Used in demanding areas of ships, offshore platforms, and other marine engineering projects requiring excellent mechanical properties and weldability.