Difference between LR EH46 and LR EH50 steel plate

Dec 19, 2025 Leave a message

LR EH46 and LR EH50 are both Lloyd's Register (LR) shipbuilding steel grades, with the main difference being their strength level: EH50 offers higher minimum yield strength (500 MPa) and tensile strength (610-770 MPa) compared to EH46 (460 MPa yield, 570-720 MPa tensile), making EH50 a stronger, high-strength steel for more demanding structural applications in ships, while EH46 is a standard high-strength grade.

Chemical Composition

LR EH46 extra high Strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Al	N
LR EH46	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 EH50 extra high Strength Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Al	N
LR EH50	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 EH46 extra high strength property
Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
LR EH46	mm	Min Mpa	Mpa	Min %	-40	J	J
	t≤50	460	570-720	19%		31	46
	50＜t≤70	460	570-720	19%		31	46
	70＜t≤100	460	570-720	19%		31	46
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

LR EH50 extra high strength property
Grade		Mechanical Property			Charpy V Impact Test
Grade	Thickness	Yield	Tensile	Elongation	Degree	Energy 1	Energy 2
LR EH50	mm	Min Mpa	Mpa	Min %	-40	J	J
	t≤50	500	610-770	18%		33	50
	50＜t≤70	500	610-770	18%		33	50
	70＜t≤100	500	610-770	18%		33	50
Note: Energy 1 is transverse impact test, Energy 2 is longitudinal

LR Grade EH46:

Yield Strength (min): 460 MPa

Tensile Strength: 570-720 MPa

Elongation (min): 17%

Use: Standard high-strength shipbuilding steel.

LR Grade EH50:

Yield Strength (min): 500 MPa

Tensile Strength: 610-770 MPa

Elongation (min): 16%

In essence: EH50 is the stronger sibling, providing more resistance to deformation (higher yield) and fracture (higher tensile) than EH46, indicated by the higher number in its name (50 vs. 46).