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Henan BEBON international co.,ltd located in zhengzhou ,henan province of china. Since it was established in 2008, Henan BEBON has earned an outstanding reputation for its professional exporting shipbuilding steel.About the products,we mainly specialized in steel products for shipbuilding which have been approved by some authoritative classification societies,likeLR,BV,ABS,DNV,GL and so on . Besides, we have three big warehouses--Zhengzhou,Tianjin and shanghai.
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Bulb flat shipbuilding steel material AH36, DH36, EH36

      Bulb Flat Shipbuilding Steel Materials

　　Shipbuilding steel material Grade A, B, D, E, AH32/40, Grade AH36, DH36, EH36, DH32/36/40, EH32/36/40 in carbon and alloy steel, compatible with high strength, low temperature and high heat input soldering.
     
      Shipbuilding Steel Materials Category
　　Bulb Flat Shipbuilding Steel Grades: A, B, D, E, AH32/36/40, DH32/36/40, EH32/36/40
　　According to its yield strength, shipbuilding plate of can be divided into below grades:
　　Grade A steel is the impact force subjected to normal temperature (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.　　
　　High-strength shipbuilding steel plate can be further divided into: AH32, DH32, EH32; AH36, DH36, EH36 and AH40, DH40, EH40.

　　1. The general grades A, B, D, and E are distinguished according to the impact temperature of the steel. The impact values of all grades of steel are the same.
　　2. High-intensity hull structure steel preheating requirements: For all AH, DH, EH plate thickness greater than 30mm angle, butt joints, shall be preheating to 120 ~ 150 °C before welding.
　　3. For thickness of the plate ≤ 30mm, the ambient temperature is below 5 ° C, preheated to 75 ° C; Ambient temperature below 0 ° C, preheated to 75 ~ 100 ° C.
 
　　Dimensions Range Size: GB: 5-27#*6-15mm, HP: 8-43#(6-18mm)
　　Surface Treatment
　　With anti-rust painting.

　　Grade AH32, DH32, EH32, AH36, DH36, EH36 Chemical Composition

Elements C Mn Al Si P S
AH32 ≤0.18 0.7~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
DH32 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
EH32 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
AH36 ≤0.18 0.7~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
DH36 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04
EH36 ≤0.18 0.90~1.60 ≥0.015 0.10~0.50 ≤0.04 ≤0.04

　　C (carbon) is an indispensable strengthening element in steel, but the increase in C content reduces the low-temperature impact toughness of steel and deteriorates the weldability of steel. Therefore, it is necessary to control the C content in the steel.

　　According to the experience of producing aluminsum-containing steel, in order to ensure the aluminum content in the steel and the fluidity of the molten steel, the method of pre-deoxidation is strictly to control the carbon content of the end point and the alloying of the large-pack alloy to control the oxidation of the molten steel. The way of adding aluminum.

　　In order to ensure good low temperature impact toughness of the steel grade, the rolling of the 355MPa class ship plate adopts a strict type II controlled rolling process.