BV Grade EH36 Ship Steel Plate

Products Description Provide Some Concrete Cases Illustrating How Chemical Composition Affects the Quality of BV Grade EH36 Ship Steel Plate The chemical composition of BV Grade EH36 Ship Steel Plate plays a crucial role in determining its quality and performance. Here are some specific cases...

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Products Description

Provide Some Concrete Cases Illustrating How Chemical Composition Affects the Quality of BV Grade EH36 Ship Steel Plate

The chemical composition of BV Grade EH36 Ship Steel Plate plays a crucial role in determining its quality and performance. Here are some specific cases that demonstrate this influence:

Case 1: Carbon Content

A higher carbon content within the specified range can increase the hardness and strength of the steel plate. For instance, if the carbon content is slightly above the optimal level, it might result in excessive hardness, making the plate more brittle and prone to cracking during fabrication or in service. On the other hand, if the carbon content is too low, the steel may lack the necessary strength to withstand the loads and stresses in a ship's structure.

Case 2: Manganese Addition

Manganese is often added to improve the toughness and hardenability of the steel. However, an excessive amount can lead to the formation of coarse grains, reducing the ductility and weldability. In one case, a steel plate with a manganese content well beyond the recommended limit showed poor weldability, causing difficulties during the construction of the ship and potentially weakening the welded joints.

Case 3: Silicon Contribution

Silicon helps in deoxidation and improves the overall quality of the steel. But if the silicon content is too high, it can cause surface defects and affect the finish of the plate. In a particular instance, a batch of BV Grade EH36 Ship Steel Plate with an elevated silicon content had visible surface irregularities, which compromised its aesthetic appeal and potentially its corrosion resistance.

Case 4: Phosphorus and Sulfur Impurities

Phosphorus and sulfur are typically considered impurities. Even small increments above the acceptable limits can have detrimental effects. Phosphorus can increase brittleness, while sulfur can cause hot shortness, reducing the formability and weldability of the steel. A case was reported where steel plates with slightly higher phosphorus and sulfur contents exhibited reduced ductility and cracking during forming operations.

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Grade	YieldStrength MPA	TensileStrength MPA	Elongation%	TestTemperature°C	V Ballistic Work
Thickness mm
≤50	>50~70	>70~100
L	T	L	T	L	T
A	≥235	400-520	≥22	20			34	24
B	≥235	400-520	≥22	0	27	20	34	24
D	≥235	400-520	≥22	-20	27	20	34	24
E	≥235	400-520	≥22	-40	27	20	34	24
AH32	≥315	440-570	≥22	0	31	22	38	26
DH32	≥315	440-570	≥22	-20	31	22	38	26
EH32	≥315	440-570	≥22	-40	31	22	38	26
AH36	≥355	490-630	≥21	0	34	24	41	27
DH36	≥355	490-630	≥21	-20	34	24	41	27
EH36	≥355	490-630	≥21	-40	34	24	41	27
AH40	≥390	510-660	≥20	0	41	27
DH40	≥390	510-660	≥20	-20	41	27
EH40	≥390	510-660	≥20	-40	41	27