Q:What are the essential steel performance indicators to consider when selecting materials?

When evaluating the stamping performance of steel, it is necessary to comprehensively consider core indicators such as yield strength, yield ratio, elongation, r-value (plastic strain ratio), and n-value (work hardening index).

Time：26/05/2026 17:36:44

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