RINA Grade EH32 Marine Steel Plate

RINA EH32 grade marine steel is a high-strength shipbuilding steel plate that is certified by the Italian classification society RINA (Registro Italiano Navale). This steel grade is specifically designed for use in the construction of ships and offshore structures, and is known for its excellent strength and durability in harsh marine environments.

RINA EH32 steel typically has a yield strength of 315 MPa and a tensile strength of 440-590 MPa, making it a high-strength steel suitable for use in demanding marine applications. It is also known for its good toughness and weldability, which make it easy to fabricate and form into complex shapes.

Some of the key properties of RINA EH32 grade marine steel include:
1. Corrosion resistance: RINA EH32 steel is highly resistant to corrosion in marine environments, which makes it ideal for use in shipbuilding and offshore structures.
2. High strength: The steel has a high yield strength and tensile strength, which makes it suitable for use in the construction of large and heavy ships.
3. Good toughness: RINA EH32 steel has good toughness and ductility, which allows it to withstand harsh marine conditions and heavy loads.
4. Weldability: The steel is easy to weld using common welding methods, which makes it easy to fabricate and form into complex shapes.

Chemical Composition

Steel grade	C	Si	Mn	P	S	Als
Grade AH32	≤0.18	≤0.50	0.9-1.6	≤0.035	≤0.035	≥0.015
Grade DH32	≤0.18	≤0.50	0.9-1.6	≤0.035	≤0.035	≥0.015
Grade EH32	≤0.18	≤0.50	0.9-1.6	≤0.035	≤0.035	≥0.015
Grade FH32	≤0.18	≤0.50	0.9-1.6	≤0.035	≤0.035	≥0.015

Processing for Different Grades
Grade D, E (DH32, DH36, EH 32, EH 36)
Grade D and E series (inlcuding AH32/36, DH32, DH36, EH32, EH36) shipbuilding steel plates require good low temperature toughness and good welding performance. The production high-strength shipbuilding steel plate needs to be normalized by means of controlled rolling and controlled cooling or heat treatment processes with more complete equipment. At the same time, the internal steel purity of the supplied billets is required to be high, especially the content of S, P, N, 0 and H in the steel should be strictly controlled.

Alloy Elements Added to Improve Toughness
In order to ensure the performance of high-strength ship plates, micro-alloying technology is adopted. By adding Nb, V, Ti and other alloying elements to the steel, combined with the controlled rolling process, the grain is refined and the toughness is improved.

Direction of Development for Shipbuilding Plate
High strength, high specification, with the ship's large-scale and safety, and changes in coating specifications, the demand for ordinary A-class panels is gradually reduced, and the demand for high-strength panels is increasing, which is concentrated in large ships of 5m wide. Plate, 200-300mm thickness special thick ship board.

Mechanical Properties

Steel grade	Yield point/MPa	Tensile point /MPa	Elongation/%	Temperature/° C	V-type impact test
					Akv/J
					≤50MM	50-70MM	70-100MM
Grade AH32	≥315	440-570	≥22	0	31/22	38/26	46/31
Grade DH32	≥315	440-570	≥22	-20	31/22	38/26	46/31
Grade EH32	≥315	440-570	≥22	-40	31/22	38/26	46/31
Grade FH32	≥315	440-570	≥22	-60	31/22	38/26	46/31