LR Grade E Steel Plate | Grade E Shipbuilding Steel Plate

LR Grade E steel plate, also called LR/E, LR/E, Lloyd's Register Grade E or simply Grade E ship steel plate, is an ordinary-strength hull structural steel with -40°C Charpy toughness under Lloyd's Register Rules for Ships (IACS UR W11 ordinary-strength family). All four ordinary grades A, B, D and E share 235 MPa minimum yield and 400-520 MPa tensile strength; the grade letter sets the toughness requirement. Gangsteel, a steel plate exporter, supplies LR Grade E general strength steel plate for ship hulls, decks, bulkheads, barges and general marine structures.

Data source: Per IACS UR W11 (ordinary/higher-strength hull structural steel) as adopted in Lloyd's Register Rules for Ships. Verify the current LR edition before ordering.

LR/E Chemical Composition (Heat Analysis)

 

Grade	C, max	Mn	Si	P, max	S, max	Al (acid sol.)	C + Mn/6, max
LR/E	0.18	≥0.70	0.10-0.35	0.035	0.035	≥0.015	0.40

Per IACS UR W11 / LR Rules for Ships (ordinary-strength hull structural steel). Ni, Cr, Mo and Cu are to be determined and reported. Carbon equivalent: Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 (%); crack sensitivity: Pcm = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 + 5B (%). 依据 IACS UR W11 / LR Rules for Ships.

Product Analysis (Check Analysis)

 

IACS UR W11 / LR Rules for Ships do not separately tabulate product (check) analysis limits for ordinary-strength grades. When product analysis is required, the finished plate shall meet the heat limits subject to ASTM A6/A6M Table A permitted variations (same practice as ABS MW Pt2 referencing ASTM A6 chemical tolerances).

Element	Heat analysis limit	Product analysis (heat ± A6)
C	0.18 max	0.22 max (heat + A6 over-max)
Mn	≥0.70	min-only; no A6 product band keyed to upper limit
Si	0.10-0.35	0.05–0.40
P	0.035 max	0.045 max
S	0.035 max	0.045 max
Al (acid sol.)	≥0.015	no A6 Table A tolerance; product value not tabulated
C + Mn/6	0.40 max	calculated from heat analysis
Ni, Cr, Mo, Cu	to be determined and reported	-

依据 IACS UR W11 / LR Rules for Ships. Product analysis applies only when specified; for a range, results may not vary both above and below it.

LR/E Mechanical Properties

 

Grade	Yield strength, min	Tensile strength	Elongation, min
LR/E	235 MPa [34 ksi]	400-520 MPa [58-75 ksi]	22%

Per IACS UR W11 / LR Rules for Ships. Yield and tensile values apply for the full thickness range covered by the grade (typically up to 100 mm for these ship plates).

Charpy V-Notch Impact Requirements (-40°C [-40°F])

 

Thickness	Test temperature	Longitudinal, avg min	Transverse, avg min
t≤50 mm	-40°C [-40°F]	27 J	20 J
50<t≤70 mm	-40°C [-40°F]	34 J	24 J
70<t≤100 mm	-40°C [-40°F]	41 J	27 J

Per IACS UR W11 / LR Rules for Ships. Average of three full-size Charpy V-notch specimens; not more than one value below the average and none below 70% of it.

Delivery Condition and Deoxidation

Deoxidation: Killed and fine-grain treated. Delivery condition: Always killed and fine-grain treated. Supplied normalized or TMCP; as-rolled delivery is not used for the E toughness class. Optional extras by agreement include ultrasonic testing, Z-direction (Z15/Z25/Z35) through-thickness testing and third-party LR survey.

Thickness Coverage

Ordinary-strength LR grades are commonly supplied from about 6 mm to 100 mm thick (wider/thicker by agreement with LR). Width 1500-4000 mm and length 6000-18000 mm are typical mill ranges.

Equivalent Steel Grades of LR/E

 

Society / Standard	Equivalent grade
LR (Lloyd's Register)	LR/E
ABS	ABS E steel plate (AB/E)
CCS	CCS E steel plate
ASTM A131/A131M	ASTM A131 Grade E steel plate
DNV	NV E
GL	GL-E
BV	BV/E
NK / KR / RINA	K E / R E / RI/E

IACS member societies harmonize ordinary and higher-strength hull grades under UR W11; dual certification (for example LR + ABS, or LR + ASTM A131) is common when ordered that way.

FAQ about LR Grade E Steel Plate

What is LR Grade E steel plate?

It is an ordinary-strength hull structural steel under Lloyd's Register Rules for Ships (IACS UR W11 family), with 235 MPa minimum yield and 400-520 MPa tensile strength.

What does the letter E mean in LR Grade E?

Grade E is Charpy tested at -40°C and is always killed and fine-grain treated for the highest toughness among ordinary grades.

What is the yield strength of LR Grade E?

Minimum 235 MPa (34 ksi), with tensile strength 400-520 MPa (58-75 ksi) and elongation about 22% min.

Does LR Grade E require impact testing?

Yes. Charpy V-notch at -40°C [-40°F] for all thicknesses, with energy rising by thickness band.

Is LR Grade E the same as ABS Grade E or ASTM A131 Grade E?

Requirements are essentially harmonized under IACS UR W11. ABS and ASTM A131 Grade E are counterparts; plates can be dual-certified when ordered with the required society survey and marking.

Is LR Grade E weldable?

Yes. Low carbon and controlled carbon equivalent give good weldability with standard shipyard procedures; preheat depends on thickness, Ceq and restraint.

What thickness is available for LR Grade E?

Typical mill supply is about 6-100 mm thick, 1500-4000 mm wide and 6000-18000 mm long; thicker or wider plates by agreement with LR.

What heat treatment is used for LR Grade E?

Normalized or TMCP; as-rolled is not used for the E toughness class.

Other LR Steel Plate Grades

LR Grade A steel plate | LR Grade B steel plate | LR Grade D steel plate | LR AH32 steel plate | LR AH36 steel plate | LR AH40 steel plate | LR DH32 steel plate | LR DH36 steel plate | LR DH40 steel plate | LR EH32 steel plate | LR EH36 steel plate | LR EH40 steel plate | LR FH32 steel plate | LR FH36 steel plate | LR FH40 steel plate

Equivalent Class Society Grades

LR Grade E corresponds to the same grade under the other IACS member classification societies and ASTM A131: CCS Grade E steel plate, ABS Grade E steel plate, ASTM A131 Grade E steel plate, GL Grade E steel plate, DNV Grade E steel plate, BV Grade E steel plate, NK Grade E steel plate, KR Grade E steel plate, RINA Grade E steel plate.