Description

ABS LR BV Grade Shipbuilding Steel Plate refers to structural marine steel plates certified by the American Bureau of Shipping (ABS), Lloyd’s Register (LR), and Bureau Veritas (BV). These shipbuilding steel plates must meet the stringent requirements of their respective classification societies regarding chemical composition, mechanical properties (strength, toughness), and weldability, and are widely used in ocean-going vessels, offshore platforms, and marine engineering structures.

ABS LR BV Grade Shipbuilding Steel Plate Classification:

While the naming rules for different classification societies may vary slightly, the core indicators follow internationally unified standards (such as the IACS Common Standards). The following is a comparison of the main steel grades:

1. General Strength Steel (Yield Strength ≥235 MPa):

Grade A: ABS-A / LR-A / BV-A

Grade B: ABS-B / LR-B / BV-B

Grade D: ABS-D / LR-D / BV-D (Room Temperature Impact)

Grade E: ABS-E / LR-E / BV-E (-20℃ Low Temperature Impact)

2. High Strength Steel (Yield Strength ≥315/355 MPa, etc.):

Grade 32 (Yield Strength 315 MPa): AH32/DH32/EH32/FH32

Grade 36 (Yield Strength 355 MPa): AH36/DH36/EH36/FH36 Grade 40 and above: AH40/DH40/EH40, etc. (Some classification societies support higher strengths such as EH47, FH47, etc.)

Note: The letter prefix represents the quality grade (A/B/D/E/F), and the number represents the minimum yield strength (kgf/mm² or approximate MPa value). For example, DH36 indicates grade D high-strength steel with a yield strength of 355 MPa. *

Performance requirements for ABS LR BV Grade Shipbuilding Steel Plate:

Steel plates obtaining ABS, LR, and BV certification must possess the following characteristics:

1. ABS LR BV Grade Shipbuilding Steel Plate has high strength and high toughness: especially grade E and F steel plates, which need to maintain excellent impact toughness in environments ranging from -20℃ to -60℃ to prevent low-temperature brittle fracture.

2. ABS LR BV Grade Shipbuilding Steel Plate has good weldability: adapting to the thick plate welding requirements brought about by the increasing size of ships, controlling the carbon equivalent to ensure the performance of the heat-affected zone.

3. Resistance to lamellar tearing: For Z-direction steel plates (e.g., Z15/Z25/Z35), ductility in the thickness direction must be guaranteed to prevent weld cracks.

4. Dimensional accuracy: Thickness tolerance is typically controlled within ±0.2mm, and surface quality must meet stringent flaw detection requirements.

Applications of ABS LR BV Grade Shipbuilding Steel Plate:

1. ABS LR BV Grade Shipbuilding Steel Plate is used in shipbuilding: hull structures (keels, sides, decks, etc.) for container ships, tankers, LNG/LPG carriers, and bulk carriers.

2. ABS LR BV Grade Shipbuilding Steel Plate is used in marine engineering: offshore wind turbine foundation piles, oil platform jackets, and subsea pipeline support structures.

3. ABS LR BV Grade Shipbuilding Steel Plate is used in special facilities: steel structures for coastal power plants, dock facilities, icebreakers, and other vessels operating in high-altitude and cold environments.

Standards of Shipbuilding Steel Plate:

ASTM A131 Steel Plate Chemical Composition (max.)
Grade	C	Mn	Si	P	S	Others
Grade A	0.21	2.5xC	0.5	0.035	0.035
Grade B	0.21	0.6	0.35	0.035	0.035
Grade D	0.21	0.6	0.01-0.35	0.035	0.035
Grade E	0.18	0.7	0.01-0.35	0.035	0.035
AH32/DH32/EH32	0.18	0.90-1.60	0.10-0.50	0.035	0.035	Cb 0.02-0.05, V 0.05-0.10, Ti 0.02, Cu 0.35, Cr 0.20, Ni 0.40, Mo 0.08, Als min. 0.015
AH36/DH36/EH36
AH40/DH40/EH40
FH32/FH36/FH40	0.16	0.90-1.60	0.10-0.50	0.025	0.025

ASTM A131 Steel Plate Mechanical Properties
Grade	Yield Strength	Tensile Strength	Elongation in 8 in.	Elongation in 2 in.
Grade	min. MPa)	MPa	min. %	min. %
Grade A, B, D, and E	235	400-520	21	24
AH32 DH32 EH32 FH32	315	440-590	19	22
AH36 DH36 EH36 FH36	355	490-620	19	22
AH40 DH40 EH40 FH40	390	510-650	19	22

ASTM A131 Steel Plate Charpy V-Notch Impact Test Temperature
Grade	Temperature ⁰F [⁰C]
Grade A	68 [20]
Grade B AH32 AH36 AH40	32 [0]
Grade D DH32 DH36 DH40	-4 [-20]
Grade E EH32 EH36 EH40	-40 [-40]
FH32 FH36 FH40	-76 [-60]

Standard	Shipbuilding and Offshore Structure Steel Grades
ASTM A131	Grade A	Grade B	Grade D	Grade E
	AH32	DH32	EH32	FH32
	AH36	DH36	EH36	FH36
	AH40	DH40	EH40	FH40
EN 10225	S355G2+N	S355G3+N	S355G5+M	S355G6+M
	S355G7+M	S355G7+N	S355G8+M	S355G8+N
	S355G9+N	S355G9+M	S355G10+N	S355G10+M
	S420G1+Q	S420G1+M	S420G2+Q	S420G2+M
	S460G1+Q	S460G1+M	S460G2+Q	S460G2+M
API SPEC 2H	API 2H-42	API 2H-50

Steel Grade	C	Si	Mn	P	S	Als
A	≤0.21	≤0.50	≥2.5c	≤0.035	≤0.035
B	≤0.21	≤0.35	0.8~1.2	≤0.035	≤0.035
D	≤0.21	≤0.35	0.6~1.2	≤0.035	≤0.035	≥0.015
E	≤0.18	≤0.35	0.7~1.2	≤0.035	≤0.035	≥0.015
AH32	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
DH32	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
EH32	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
FH32	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
AH36	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
DH36	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
EH36	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
FH36	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
AH40	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
DH40	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
EH40	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015
FH40	≤0.18	≤0.50	0.9~1.6	≤0.035	≤0.035	≥0.015

Standards and Classifications

Standard	Shipbuilding and Offshore Structure Steel Plate Grades
ASTM A131	Grade A	Grade B	Grade D	Grade E
	AH32	DH32	EH32	FH32
	AH36	DH36	EH36	FH36
	AH40	DH40	EH40	FH40
EN 10225	S355G2+N	S355G3+N	S355G5+M	S355G6+M
	S355G7+M	S355G7+N	S355G8+M	S355G8+N
	S355G9+N	S355G9+M	S355G10+N	S355G10+M
	S420G1+Q	S420G1+M	S420G2+Q	S420G2+M
	S460G1+Q	S460G1+M	S460G2+Q	S460G2+M
API SPEC 2H	API 2H-42	API 2H-50