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Home > products> ABS Grade AH40, DH40, EH40, FH40 Shipbuilding Steel Plates

ABS Grade AH40, DH40, EH40, FH40 Shipbuilding Steel Plates

Class Cert.: ABS/BV/CCS/DNV/KR/LR/NK/RINA/RS/PRS

Material: Low Alloy Steel

Thickness: 6mm-100mm, or customized

Width: 900mm-4800mm, or customized

Length: 3000mm-25000mm, or customized

Condition of Delivery: A/HR/N/CR/Q+T/TMPC, or as request

Stock: In stock

ABS Grade DH40 Ship Steel Plate AH40, DH40, EH40, FH40 Steel Plate high-strength low-alloy (HSLA) steels

Introduction
Parameters
Service

ABS Grade AH40, DH40, EH40, FH40 Shipbuilding Steel Plates Supplier and Manufacturer

AH40, DH40, EH40, and FH40 are high-strength low-alloy (HSLA) steels, each suited for different marine environments. In essence, the key difference lies in their toughness and impact resistance, which improves from AH40 to FH40.

AH40 is suitable for general marine applications, offering good strength and weldability.

DH40 is tougher and designed for vessels in moderate ice or impact conditions.

EH40 offers superior toughness for harsher environments like icebreakers and offshore drilling platforms.

FH40 is built for extreme conditions, with exceptional toughness for deep-sea and high-impact offshore environments.

Heat Treatment

AH40, DH40, and EH40 are typically subjected to quenching and tempering processes.

These processes involve heating the steel to high temperatures (usually between 850°C to 950°C), followed by rapid cooling (quenching), and then tempering at 550°C to 650°C to adjust hardness and improve ductility and toughness.

FH40, designed for harsher conditions, requires specialized heat treatment such as sub-zero tempering or pre-stress relief.

These processes ensure the steel maintains its toughness even at extremely low temperatures (down to -40°C), ensuring the required 47 J impact energy.

Welding

AH40, DH40, and EH40 offer good weldability with lower carbon content compared to higher-strength steels. This allows these grades to be welded using common MIG (Metal Inert Gas) and MAG (Metal Active Gas) welding processes. These steels are suitable for automatic or semi-automatic welding.

When welding FH40, special considerations, such as preheating (typically between 100°C to 150°C) and post-weld heat treatment (PWHT), are necessary to prevent cold cracking and maintain the material’s impact resistance. Additionally, low-hydrogen welding consumables are used to ensure high toughness in the weld zone, particularly in environments where low temperatures are a concern.

Applications Of AH40, DH40, EH40, FH40

Grade	Applications	Environments
AH40	Medium-sized bulk carriers, general cargo vessels, and tankers.	mild marine environments with minimal ice or extreme weather conditions
DH40	Ice-class vessels, polar research vessels, and offshore oil tankers.	marine environments with moderate exposure to ice or impact
EH40	Icebreakers, offshore drilling platforms, ice-class cargo ships, and polar exploration vessels.	offshore environments with severe ice, high winds, and high-pressure conditions
FH40	Ice-breaking, deep-sea operations, and heavy-duty offshore platforms.	Arctic/polar environments, harsh weather, high-impact conditions

Specification Parameters

Basic Information

Chemical Composition Of AH40, DH40, EH40, FH40

Element	C	Mn	Si	P	S	Cr	Ni	Mo	Cu	N	CEV
AH40	≤0.18	0.90–1.60	0.15–0.50	≤0.030	≤0.030	≤0.20	≤0.40	≤0.08	≤0.35	–	≤0.40
DH40	≤0.18	0.90–1.60	0.15–0.50	≤0.025	≤0.025	≤0.20	≤0.40	≤0.08	≤0.35	–	≤0.40
EH40	≤0.18	0.90–1.60	0.15–0.50	≤0.025	≤0.025	≤0.20	≤0.40	≤0.08	≤0.35	–	≤0.40
FH40	≤0.16	0.90–1.60	0.15–0.50	≤0.020	≤0.020	≤0.20	≤0.80	≤0.08	≤0.35	≤0.009	≤0.45

Mechanical Properties Of AH40, DH40, EH40, FH40

Property	AH40	DH40	EH40	FH40
Yield Strength (min)	390 MPa(57 ksi)	390 MPa(57 ksi)	390 MPa(57 ksi)	390 MPa(57 ksi)
Tensile Strength (min)	510 – 660 MPa(71 – 90 ksi)	510 – 660 MPa(71 – 90 ksi)	510 – 660 MPa(74 – 96 ksi)	510 – 660 MPa(74 – 96 ksi)
Elongation (min)	22% in 200 mm(8 in)	22% in 200 mm(8 in)	22% in 200 mm(8 in)	22% in 200 mm(8 in)
Charpy V-Notch Impact	27 J at -20°C (-4°F)	27 J at -20°C (-4°F)	27 J at -20°C (-4°F)	47 J at -40°C (-40°F)