Due to the particularity and complexity of ship working conditions, higher requirements are put forward for the metal materials used to manufacture ship hull structures. Hull structural steel must have good mechanical properties. The main indicators are as follows:

1. Strength
Strength - the ability of a metal material to resist fracture and deformation under external forces.

2. Plasticity
Plasticity - the ability of a metal material to produce plastic deformation without damage under external forces.

3. Impact toughness
Impact toughness - the ability of a metal material to resist impact load and brittle failure.

4. Fatigue strength
Fatigue strength - the ability of a metal material to resist repeated external forces, that is, the ability not to cause damage under an infinite number of alternating loads, expressed in 6N.

5. Hardness
Hardness - the ability of a metallic material to resist being pressed into surface by something harder than it.

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