Steel performance parameters directly affect its engineering applicability.

Strength:
Yield Strength (ReH): The stress value at which steel begins to undergo plastic deformation. For example, the yield strength of Q235 steel is ≥235MPa (GB/T 700-2006).
Tensile Strength (Rm): The maximum stress that steel can withstand before fracture. For example, the tensile strength of 45# steel is ≥600MPa (GB/T 699-2015).

Plasticity:
Elongation (A): The percentage elongation of the specimen after fracture in a tensile test. The elongation of ordinary carbon steel is typically ≥20% (GB/T 228.1-2021).
Reduction of Area (Z): Reflects the material's ability to deform locally; the Z value of high-quality alloy steel can reach over 50%.

Toughness:
Impact Energy (KV): The energy absorbed by the specimen at fracture in a Charpy impact test, measured in Joules (J). Temperature Effects: Steel toughness decreases at low temperatures, necessitating the selection of high-toughness materials such as 9Ni steel used in LNG storage tanks.

Strength, plasticity, and toughness are key properties of steel; actual material selection requires a comprehensive evaluation considering operating conditions, cost, and processing technology.

Time：18/05/2026 15:17:13

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