LR AH40 is a high-quality shipbuilding steel plate designed for use in the construction of marine vessels and offshore structures. Its composition and properties ensure exceptional durability and reliability in harsh marine environments. This article delves into the chemical composition, mechanical properties, heat treatment state, dimensional range, impact testing, primary applications.
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LR AH40 high Strength Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
Al |
N |
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LR AH40 |
0.18 |
0.05 |
0.9-1.6 |
0.035 |
0.035 |
0.015 |
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Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
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0.02-0.05 |
0.03-0.10 |
0.02 |
0.35 |
0.20 |
0.40 |
0.08 |
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Crack Sensitivity: Pcm = (C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B)%
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
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LR AH40 high strength property |
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Grade |
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Mechanical Property |
Charpy V Impact Test |
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Thickness |
Yield |
Tensile |
Elongation |
Degree |
Energy 1 |
Energy 2 |
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LR AH40 |
mm |
Min Mpa |
Mpa |
Min % |
0 |
J |
J |
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t≤50 |
390 |
510-650 |
20% |
26 |
39 |
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50＜t≤70 |
390 |
510-650 |
20% |
31 |
46 |
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70＜t≤100 |
390 |
510-650 |
20% |
37 |
55 |
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Note: Energy 1 is transverse impact test, Energy 2 is longitudinal |
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Heat Treatment State
LR AH40 steel plate is typically supplied in a normalized or controlled rolling condition. This heat treatment ensures uniform microstructure and mechanical properties throughout the plate, optimizing its performance in various applications.
Dimensional Range
LR AH40 steel plate in a wide range of thicknesses, widths, and lengths to cater to different shipbuilding and offshore structure requirements. Customers can choose from a variety of standard sizes or request custom dimensions to fit their specific needs.
Impact Testing
To ensure the safety and reliability of structures made from LR AH40 steel plate, impact testing is performed at various temperatures. This testing evaluates the plate's ability to absorb energy without fracturing under sudden impact loads, crucial for offshore and marine applications.
Major Applications
LR AH40 steel plate is widely used in the construction of ships, barges, offshore platforms, and other marine structures. Its excellent mechanical properties, corrosion resistance, and weldability make it a preferred material for these demanding applications.
