ABS Gl-D32 Ah36 Steel Plate For Shipbuilding Marine Steel Plate

Effect on Strength

 

Obstruction of Dislocation Movement: When the AH36 marine steel plate is subjected to an external force, the dislocations inside begin to move. Carbides are precipitated inside the grains and at the grain boundaries, and the dislocations will encounter these carbides during their movement. Due to the presence of carbides, the dislocations cannot move as freely as in steel without precipitation. For example, the dislocations need to bypass these carbides or break through them to continue moving, and both of these methods require additional energy. It's like setting many obstacles (carbides) on a road (the lattice structure of the steel), and the vehicles (dislocations) will be hindered when they want to move forward. More power (external force) is needed to move the dislocations, so that the steel exhibits higher strength on a macroscopic level and can bear a greater load without excessive deformation.

 

Prevention of Grain Deformation and Sliding: From a microscopic structure perspective, steel is composed of numerous grains. Under the action of force, relative sliding or deformation may occur between the grains. The carbides are precipitated at the grain boundaries, just like placing solid "wedges" in the "gaps" between the grains. When an external force acts on the steel plate, these carbides can prevent the relative sliding between the grains and keep the relative positions of the grains stable. This makes the overall structure of the steel more solid, just like using glue to fix the connections between building blocks (grains), enhancing the steel's ability to resist deformation and further increasing its strength.

 

 

 

 

 

 

 

 

High Strength Chemical Composition
Grade	C	Si	Mn	P	S
DNV steel	0.18	0.10-0.35	0.9-1.6	0.035	0.035

Effect on Toughness

 

Crack Propagation Obstruction: Toughness is the material's ability to resist crack propagation. In the AH36 steel plate, carbide precipitation helps to improve toughness. When a crack is generated and begins to propagate in the steel, it will encounter carbide precipitation. Due to the presence of carbides, the crack propagation path will be disrupted. The crack either needs to bypass the carbides, which will change its propagation direction and make the crack propagation path more tortuous, or it needs to break the carbides to continue advancing, which will consume the energy of crack propagation. For example, imagine that the crack is a river and the carbides are boulders in the river. When the river (crack) encounters the boulders (carbides), it needs to change its flow direction (crack propagation direction) or break through the boulders (destroy the carbides) to continue flowing. This increases the difficulty of crack propagation and thus improves the toughness of the steel.

 

Synergistic Effect of Grain Refinement: In the process of manganese - element - formed carbide precipitation, it often also plays a certain role in grain refinement. The refined grains can increase the grain - boundary area, and the grain boundary is a natural barrier to crack propagation. The carbides are precipitated at the grain boundaries and inside the grains, and they work together with the refined - grain structure to further enhance the steel's ability to resist crack propagation. When the steel is subjected to an external impact or other forces, this synergistic effect enables the steel to better absorb and disperse energy, reducing the possibility of crack generation and propagation, and thus improving toughness.

 

 

 

 

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