The performance of copper alloys in RI/E40 and RI/D40 ship plate steels has both similarities and some differences, as follows:

 

Corrosion Resistance Aspect:

 

Formation of Protective Rust Layer: In both types of ship plate steels, copper alloys can promote the formation of a protective rust layer on the steel surface. This rust layer can, to a certain extent, inhibit corrosive media such as oxygen and seawater from further eroding the interior of the steel. However, this rust layer is relatively loose and its protection effect is not as good as some other protection mechanisms (such as the dense protective film formed by nickel alloys on the steel surface) in a high - salinity and high - humidity marine environment. But in a marine environment with relatively low salinity or intermittent drying, it can provide a certain degree of corrosion resistance and effectively delay the corrosion process of the steel.

 

Influence on Strength and Toughness:

 

Strength Improvement Aspect: Copper alloys mainly improve the performance of steel by refining the grain structure. The refined grains make the performance of steel more uniform and stable. When the steel is subjected to complex stress conditions of the ship, it can more evenly distribute the stress, thereby improving the strength of the steel to a certain extent. However, compared with some other alloy elements (such as nickel alloys), the strength - improvement range of copper alloys is relatively small.

 

 

 

 

 

 

 

RI/AH40 high strength property in tempering and quenching

Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Impact Energy
	(mm)	MPa (min)	MPa	% (min)	(KV J) (min)
					0 degree
RINAAH40	8-240	390	510-650	20	41J

 

 

 

Other Aspects:

 

Cost Advantage: The price of copper is relatively stable and low - cost. Adding copper alloys in the production of RI/E40 and RI/D40 ship plate steels has a certain advantage in cost control.

 

Abundant Resources: Copper is a relatively common metal element with abundant resources and a relatively stable supply, which provides resource guarantee for the application of copper alloys in these two types of ship plate steels.

 

 

 

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