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LR Grade A B D E Marine Steel Plate

LR A B D E steel is a kind of hot rolled general tensile strength steel.
General-strength LR shipbuilding steel comes in 12 grades of 3 strengths,
Grade A B D E are ones of the grades. The LR grade A B D E steel plates
have yield strength of 235 MPa, and ultimate tensile strength of 400-520 MPa.

PRODUCT DETAILS

Brief introduction of marine steel plate
Marine steel plate refers to structural steel used in ship building. It is considered a marine grade and must be able to resist corrosive effects that are common in a water environment. To achieve this, special alloying elements are added to these grades in order to defend agaist corrosion.While most carbon steel is not suited for marine environments, there are several marine grade carbon steels that have been approved by the different societies for shipbuilding applications.

Structural steel for ship hulls is divided into strength classes according to its minimum yield strength: general strength structural steel and high strength structural steel. Maine steel plate refers to hot rolled steel plate produced in accordance with the requirements of the classication society for the construction of ship hull structures.

There are 9 main classification societies in worldwide.
A.B.S    American Bureau of Shipping
B.V.     Bureau Veritas
C.C.S.   China Classification Society
D.N.V   Det Norske Veritas
G.L.    Germanischer Lloyd
K.R.    Korean Register of Shipping
L.R.    Lloyd’s Register of Shipping
N.K.    Nippon Kaiji Kyokai
R.I.N.A  Registro Italiano Navale

LR A B D E steel is a kind of hot rolled general tensile strength steel. General-strength LR shipbuilding steel comes in 12 grades of 3 strengths,Grade A B D E  are ones of the grades. The LR grade A B D E steel plates have yield strength of 235 MPa, and ultimate tensile strength of 400-520 MPa. 

Grade A steel is the impact force subjected to 20 ° C
Grade B steel impact force at  0 ° C
Grade D steel impact force at -20 ° C
Grade E steel impact force at -40 ° C

Shot blasting service
Shot blasting is a method used to clean or polish steel when enhanced surface finishes are required. Shot blasting is used in almost every industry we serve. Especially in shipbuilding, rail,structural fabrication and more.

Specifications range
Thickness:2.5-120mm
Width:1000-3000mm
Length: As request
 
Chemical composition and mechanical properties
Chemical Composition
Steel grade C Si Mn P S Als
Grade A ≤0.21 ≤0.50 ≥2.5C ≤0.035 ≤0.035 -
Grade B ≤0.21 ≤0.35 0.8-1.2 ≤0.035 ≤0.035 -
Grade D ≤0.21 ≤0.35 0.6-1.2 ≤0.035 ≤0.035 ≥0.015
Grade E ≤0.18 ≤0.35 0.7-1.2 ≤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 A 235 400-520 ≥22 20 - 34/24 41/27
Grade B 235 400-520 ≥22 0 27/20 34/24 41/27
Grade D 235 400-520 ≥22 -20 27/20 34/24 41/27
Grade E 235 400-520 ≥22 -40 27/20 34/24 41/27

Warehouse storage

Our products has been wildly sold to Northeast, North China, East China, Europe, Middle East, Southeast Asia, Australia and ect...Total area of our cooperation factory is approximately 58, 000 square meters, and registered capital is RMB 10 million Yuan, and fixed assets is RMB 50 million Yuan.

 

 

Packaging and shipping

The company specializes in selling steel, with best-selling products including PPGI, galvanized steel coil, steel plate, stainless steel plate, seamless welded steel pipe, aluminum coil, angle steel, H-shaped steel beam, and threaded steel. The product performance indicators have reached the advanced level in China. Our products have been widely sold to Northeast, North China, East China, Europe, the Middle East, Southeast Asia, Australia, etc

 

 

Customer communication

With the strategic thought of striving for survival on the basis of quality and development on the basis of benefit, adhering to management idea of "faith, practical, innovation, and development", we have courage to challenge, and keep continuous innovation in the competition.

 

 

Application area

We also do our unremitting efforts to fight bravely for creating a national brand and international brand. Holding to the intellectual businessman of style and the spirit of sincerity, all staff of our company are willing to cooperate and develop together with you.

 

COOPERATIVE PARTNER


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FAQ

What ports of shipment are there?

A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can specify other ports according to your needs.

What product information do I need to provide?

A:Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase.

Do you provide custom made Products service?

A: Yes,if you have your own design , we can produce according to your specification and drawing.

What about product prices information?

A:Prices various according to periodic price changes of raw materials.

Can you send samples?

A:Of course, we can provide customers with free samples and express shipping service to all over of the world.

It's my first time to import steel products, can you help me with it?

A:Sure,we have agent to arrange the shipment, we will do it together with you.

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