DH40 EH40 FH40 Shipbuilding steel plate

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional dh40 eh40 fh40 shipbuilding steel plate manufacturers and suppliers in China. Welcome to wholesale customized dh40 eh40 fh40 shipbuilding steel plate at competitive price from our factory. Good service and quality products are available.

 

 

 

DH40 Steel Plate complies with the certification requirements of nine major classification societies including China CCS, UK LR, and US ABS. As a high-strength hull structural steel with yield strength ≥355MPa, it is specifically designed for shipbuilding and offshore engineering. Its performance strictly adheres to:
National Standard: GB/T 712-2011 "Structural Steel for Ships and Offshore Engineering"
International Code: IMO MSC.290(87) Ship Energy Efficiency Regulations

DH40 EH40 FH40 Shipbuilding steel plate  Key Performance Parameters

Parameter	Standard Requirement	Typical Value
Yield Strength (MPa)	≥355	370-410
Tensile Strength (MPa)	490-620	520-580
Elongation (%)	≥22	24-26
Impact Energy (-20℃, J)	≥34	46-58
Cold Bending Performance	180° without cracking	d=2a qualified

 

Application of Ansteel's Newly Developed MACC Process (Multi-stage Accelerated Cooling Control):

Two-Stage Rolling:

Roughing temperature: 1150℃ → Finishing temperature: 850℃
Dynamic Cooling:

Ultra-fast cooling rate: 45℃/s

Achieves ASTM Grade 12 grain size from surface to 1/4 thickness

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III. Typical Application Scenarios & Engineering Cases
3.1 Mega Container Ship Construction
Validated in Hudong-Zhonghua Shipbuilding's 24,000 TEU container vessel:

15% thinning of cargo hold outer plates, reducing single-vessel weight by 820 tonnes

40% improvement in welding efficiency with CTOD fracture toughness ≥0.25mm

3.2 Critical Joints in Offshore Platforms
Performance data from "Shenhai-1" Energy Station applications:

85mm-thick jacket pipe joints maintain Z35 anti-lamellar tearing performance

Annual corrosion rate <0.03mm under harsh South China Sea conditions (Cl⁻ concentration: 3.5%)

 

EH40 is a high-strength hull structural steel primarily used in critical components of ships and offshore engineering requiring exceptional strength and toughness. In its designation:

E denotes high strength (yield strength ≥420MPa)

H indicates Quenched and Tempered (Q&T) treatment

40 represents the minimum yield strength of 420MPa (40ksi).
Through optimized alloy design and heat treatment, EH40 combines ultra-high strength, superior low-temperature toughness, and fatigue resistance. It is ideal for constructing high-end marine equipment such as large vessels and deep-sea drilling platforms operating under complex maritime conditions.

 

EH40 Mechanical Properties

After Q&T treatment, EH40 exhibits:

Yield Strength (σ₀.₂): ≥420MPa. Withstands extreme wave loads during navigation.

Tensile Strength (σ_b): 530-680MPa. Ensures fracture resistance under complex stresses.

Elongation (δ₅): ≥19%. Absorbs energy through plastic deformation to prevent brittle failure.

Impact Toughness: ≥41J at -40℃. Guarantees safety in polar regions or winter navigation.

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EH40 Applications

EH40 is widely used in:

Mega-Scale Vessels:

Hulls, decks, and load-bearing structures of VLCCs (Very Large Crude Carriers), container ships, and cruise liners.

Reduces hull weight while enhancing payload capacity.

Deep-Sea Engineering:

Critical components of deep-sea drilling platforms and FPSOs (Floating Production Storage and Offloading units).

Resists high pressure, low temperatures, and corrosive environments.

Specialized Marine Equipment:

Icebreakers and research vessels requiring high fatigue resistance under extreme conditions.

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EH40 Production Standards & Processes

Standards:

Complies with GB/T 712-2023 Structural Steel for Ships and Offshore Engineering or ISO 630.

Strictly regulates chemical composition, mechanical properties, dimensional tolerances, and inspection protocols.

Production Process:

Steelmaking:

Electric/convertible furnace + secondary refining (LF refining, VD vacuum degassing) for precise composition control.

Rolling:

Thermomechanical controlled rolling to refine grain structure.

Heat Treatment:

Q&T process forms uniform tempered sorbite microstructure, optimizing strength-toughness balance.

Quality Control:

Tensile/impact testing, non-destructive testing (NDT), and batch-wise certification.

FH40 offshore platform structural steel plates are required to have good low-temperature impact performance, good toughness and low brittle-ductile transition temperature. The impact temperature of CCS/FH40 steel plates is -60°C, especially in cold environments, they need to have excellent low-temperature aging impact toughness.

 

The high strength and good low-temperature impact performance of FH40 steel plate make it widely used in shipbuilding and marine engineering. The hot rolling, normalizing or normalizing + tempering in the delivery state also ensures the stability of its performance.

 

GNEE STEEL can supply the highest level 250mm thick offshore steel FH40 steel, which has successfully passed the test certification of 5 classification societies. CCS, American Standard, ABS, German Standard, GL, French Standard, BV, Norwegian Standard, DNV, Japanese Standard, NK, British Standard, LR, Italian RINA, Korean Standard, KR (Norwegian Standard, DNV and German Standard are combined into: VL) and other ten major classification society certifications.

 

FH40 steel plates are high-strength structural steel plates for ships and marine routes. The impact temperature of FH40 steel plates is -60°C, and they have excellent low-temperature impact performance

Grade	Thickness(mm) max	Yieldpoint(Mpa) min	Tensile Strength(Mpa)	Elongation(%)min	V-impact test			cold bend test
					Temperature(ºC)	Average AKV		b=2a 180°	b=5a 120°
						lengthways Min	crosswise Min
DH40	50	390	510~660	20	-20	41	27	-	-
EH40	50	390	510~660	20	-40	41	27	-	-
FH40	50	390	510~660	20	-60	41	27	-	-

 

Steel plate thickness:6mm-150mm,

Width range:1800mm-4100mm,

Length range:6000mm-18000mm,

Production certification can be performed according to the required classification society certification, and Z-direction performance steel plates can be produced according to the requirements to control the phosphorus and sulfur content.

 

 

 

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