Description

Technical Parameters

FH36 Shipbuilding Steel Plate – High-Strength Marine & Offshore Steel

FH36 is a high-strength, low-alloy shipbuilding steel plate certified by major classification societies (ABS, DNV, LR, CCS, BV, NK, RINA, RS). It belongs to the FH series under the general strength and high-strength shipbuilding steel standards.

The "F" denotes the grade's impact test temperature: -60°C, making it suitable for the most severe Arctic and polar service conditions. "H36" indicates a minimum yield strength of 355 MPa (51,000 psi) and tensile strength of 490–620 MPa.

FH36 is primarily used for critical structural components in vessels, offshore platforms, and marine equipment operating in extremely low-temperature environments.

Why Choose FH36? – Key Advantages

One-stop steel procurement

Exceptional Low-Temperature Toughness – Guaranteed impact resistance down to -60°C, preventing brittle fracture in polar climates.

Multiple Delivery Conditions – Normalized, TMCP, or QT options to suit different fabrication needs.

High Strength-to-Weight Ratio – Enables lighter structural designs without sacrificing safety.

Excellent Weldability – Low carbon equivalent allows preheating and welding without cracking, even in thick sections.

Fatigue & Corrosion Resistance – Suitable for shipload cyclic stresses and saltwater exposure.

Certified by All Major Class Societies – ABS, DNV, LR, CCS, BV, NK, RINA, RS, etc.

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Mechanical Properties & Chemical Composition | Built for High Stress

C	Si	Mn	P	S	Cu	Ni	Cr	Mo
0.18	0.50	0.90–1.60	0.025	0.025	0.35	0.40	0.20	0.08

Mechanical Requirements

Parameter	Value
Standard	ASTM A131 / A131M, API 2H, EN 10025-3
Material Grade	FH36
Thickness Range	5 mm – 150 mm (customizable)
Width Range	1500 mm – 4500 mm
Length Range	6000 mm – 25000 mm
Delivery Condition	AR (As-Rolled), N (Normalized), TMCP, QT
Minimum Yield Strength	355 MPa (51,500 psi)
Tensile Strength	490 – 620 MPa
Elongation	≥ 21% (in 200mm)
Impact Test Temperature	-60°C
Impact Energy (longitudinal)	≥ 34 J (average)
Carbon Equivalent (CEV)	≤ 0.38 (typical for weldability)

Application Environment

Heavy Marine Equipment

Crane ships, dredgers, and ice-class container vessels

Naval & Defense Ships

Frigates, corvettes, submarines (hull structures)

Arctic & Polar Region Vessels

Icebreakers, Arctic tankers, Polar supply vessels

Offshore Structures

Fixed platforms, floating production units (FPSO), jack-up rigs

Comparison: FH36 vs. AH36 vs. DH36

Property	AH36	DH36	FH36
Impact Test Temperature	0°C	-20°C	-60°C
Minimum Impact Energy (J)	34 J	34 J	34 J
Typical Applications	General ship hull, decks, bulkheads – warm/temperate seas	Offshore supply vessels, Baltic Sea ships – cold regions	Arctic vessels, icebreakers, polar offshore – extreme cold
Notch Toughness Level	Normal	High	Superior (Arctic grade)
Thickness Suitability	≤ 50 mm (typical)	≤ 100 mm	Up to 150 mm
Price Index	Low	Medium	High (premium grade)
Alloying Elements	Basic Mn + Si	Higher Mn	Additional Ni, Cr, Cu for cryogenic performance
Common Delivery Condition	AR / N	N / TMCP	N / TMCP / QT
Certification & Documentation Support	Standard	Standard	Full traceability + EN10204 3.2 + all major class society approval handling

why choose us?

✔ FH36 steel plates – genuine, certified, and traceable
✔ Available from 5mm to 150mm thickness – ready to ship
✔ Free value-added services: cutting, beveling, UT inspection
✔ Small orders & fast turnaround for urgent Arctic marine projects
✔ Dedicated customer support – from mill certificate to welding advice

We supply FH36 steel plates in cut-to-size, pre-bevelled, and formed options. Surface treatment (primed or shot-blasted) and edge preparation are available upon request.

📞 Contact our marine steel experts for mill delivery schedules, class society approvals, and technical datasheets.

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User Evaluation

We used FH36 plates for an icebreaker hull being built to Polar Class 4. The -60°C impact test results matched the certificate perfectly. No issues during welding, even in 50mm thickness. The DNV and ABS paperwork was complete – saved us weeks of approval time.

Mr. Michael Tran

Senior Marine Engineer, Nordic Hull Ltd.

Needed FH36 urgently for an LNG carrier repair in Rotterdam. Supplier had stock in 25mm thickness, cut to size, and delivered within 10 days. All mill certificates (EN 10204 3.2) were provided. Will order again.

Ms. Susan

Procurement Manager, North Sea Offshore GmbH

FH36 quality is identical to European-produced plates but at a much better price. The supplier handled LR and BV classification for us. Edge beveling was accurate, and plates arrived with protective coating – no rust issues.

Mr. Carlos Mendez

Production Director, Polar Marine Shipyard S.A.

FAQ

01.What is the difference between FH36 and DH36 steel plate?

The main difference is the impact test temperature.

DH36 is tested at -20°C and suitable for cold but non-Arctic environments (e.g., North Sea, Baltic Sea).

FH36 is tested at -60°C, making it the preferred choice for Arctic vessels, icebreakers, and polar-class offshore platforms.
Both grades have the same minimum yield strength (355 MPa), but FH36 offers superior low-temperature toughness.

02.What thicknesses of FH36 steel plate are available for shipbuilding?

FH36 steel plates are typically available from 5 mm up to 150 mm in thickness, depending on the mill and delivery condition (normalized, TMCP, or QT).
Common shipbuilding thicknesses range from 8 mm to 80 mm. Custom thicknesses and cut-to-size plates are also available upon request.

03.Which classification societies certify FH36 steel plate?

FH36 can be certified by all major classification societies, including but not limited to:

ABS (American Bureau of Shipping)

DNV (Det Norske Veritas)

LR (Lloyd's Register)

CCS (China Classification Society)

BV (Bureau Veritas)

NK (Nippon Kaiji Kyokai / ClassNK)

RINA (Registro Italiano Navale)

RS (Russian Maritime Register of Shipping)

You can request specific class approval when placing your order.

04.Can FH36 steel plate be welded without preheating?

FH36 has a low carbon equivalent (typically ≤0.38), which provides good weldability.
However, for thicker plates (e.g., ≥40 mm) or in very low ambient temperatures, preheating (typically 50–100°C) is recommended to prevent hydrogen-induced cracking.
A qualified welding procedure specification (WPS) should always be followed. We provide free WPS guidance upon request.

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