BS Standard General Strength LR Marine Steel Grade A, B, D, E for shipyard refers to Lloyd's Register (LR) certified marine steel plates that meet British Standards (BS) and are commonly used in shipbuildingyards. Here are the details:

 

Chemical Composition

 

The general chemical composition of LR Marine Steel Grade A, B, D, E is as follows:

 

Grade	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Als (%)
A	≤0.21	≤0.50	≥2.5C	≤0.035	≤0.035	-
B	≤0.21	≤0.35	0.8 - 1.2	≤0.035	≤0.035	-
D	≤0.21	≤0.35	0.6 - 1.2	≤0.035	≤0.035	≥0.015
E	≤0.18	≤0.35	0.7 - 1.2	≤0.035	≤0.035	≥0.015

Mechanical Properties

 

The mechanical properties of these steel grades are presented in the table below:

 

Grade	Thickness (mm)	Min Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Test Temperature (°C)	V-type Impact Test Akv/J
A	≤50 50 - 70 70 - 100	235	400 - 520	≥22	20	20 - 34/24 41/27
B	≤50 50 - 70 70 - 100	235	400 - 520	≥22	0	27/20 34/24 41/27
D	≤50 50 - 70 70 - 100	235	400 - 520	≥22	-20	27/20 34/24 41/27
E	≤50 50 - 70 70 - 100	235	400 - 520	≥22	-40	27/20 34/24 41/27

Applications

 

These steel grades are mainly used in the following aspects:

 

Hull Construction: They are widely used in the manufacture of ship hulls, providing the necessary strength and durability to withstand the harsh marine environment and the various loads experienced during the ship's operation.

Offshore Platforms: In the construction of offshore platforms, these steel plates are used to build the structural components, ensuring the stability and safety of the platforms in the ocean.

Submarine Pipelines: They are also suitable for the manufacture of submarine pipelines, which require materials with good corrosion resistance and mechanical properties to transport oil, gas, and other substances under the sea.

 

 

 

 

 

 

 

 

 

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