The chemical composition data of ABS EH36 ship plate is roughly as follows:

 

 

 

 

Adjusting Carbon (C) Content

 

Purpose: Carbon is a crucial element that affects the strength and toughness of steel. If the strength of steel needs to be increased, the carbon content can be appropriately raised, but it should be noted that it must not exceed 0.18% to avoid affecting the welding performance and toughness. For example, for the parts of the ship plate that require higher strength to bear greater pressure, such as the ship bottom structure, the carbon content can be slightly adjusted within the allowable range.

 

Methods: During the steel - making process, the carbon content is adjusted by controlling the proportion of raw materials (such as iron ore and scrap steel). If it is necessary to reduce the carbon content, low - carbon scrap steel can be added or a decarburization process can be adopted, such as injecting decarburization powder (such as calcium - based powder) or injecting gas (such as argon - oxygen mixed gas) into the molten steel for decarburization.

 

 

Reducing the Content of Harmful Elements (Phosphorus and Sulfur)

 

Purpose: Phosphorus and sulfur will reduce the toughness and processing performance of steel, so their contents need to be strictly controlled. For high - quality ABS EH36 ship plates, the phosphorus and sulfur contents need to be controlled to not exceed 0.035%. For example, when manufacturing ship plates for polar ships with extremely high toughness requirements, the phosphorus and sulfur contents need to be more strictly reduced.

 

Methods:
Hot Metal Pretreatment: Before the hot metal enters the steel - making furnace, pretreatment methods such as KR stirring method can be adopted. Desulfurization agents (such as lime) and dephosphorization agents (such as soda ash) are added into the hot - metal ladle. Through stirring, the dephosphorization and desulfurization agents are fully mixed with the hot metal, and phosphorus and sulfur are converted into slag phase and removed.
Molten Steel Refining: During the molten steel refining stage, secondary refining processes outside the furnace such as LF (Ladle Furnace) or RH (Ruhrstahl - Heraeus) are adopted. During the refining process, through slag - making, argon - blowing and stirring operations, the phosphorus and sulfur contents in the molten steel are further reduced.

 

 

 

 

 

 

 

 

 

Thickness : 3-200mm

Width:1500-4000mm

Length:5000-15000mm

 

 

Adjusting the Content of Other Alloy Elements (Aluminum, Niobium, Vanadium, Titanium, etc.)

 

Purpose: These elements can refine the grain, improve the strength, toughness and welding performance of steel. For example, aluminum can refine the grain and improve the toughness; niobium, vanadium and titanium can improve the strength by forming carbide, nitride and other strengthening phases. According to specific performance requirements, for example, the aluminum content can be appropriately increased in the ship plate that requires high toughness, and the contents of niobium, vanadium, titanium and other elements can be appropriately increased in the parts that require high strength.

 

Methods:
Adding Alloys: The element contents are adjusted by adding corresponding alloys. For example, aluminum blocks or ferro - aluminum alloys are added to adjust the aluminum content, and ferroniobium, ferrovanadium, ferrotitanium alloys, etc. are added to adjust the contents of niobium, vanadium and titanium.
Controlling the Addition Time and Conditions: Appropriate addition time should be selected. Generally, the alloys are added during the refining stage when the molten steel temperature is high and the fluidity is good. At the same time, through appropriate stirring methods, it is ensured that the alloy elements are evenly dissolved in the molten steel, and advanced detection equipment is used to monitor the element contents in real - time to achieve the purpose of precise adjustment.

 

 

 

 

 

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