Core Mechanical Properties (JIS G 3125 Standard)
Supplementary Mechanical Properties
●Impact Toughness: No mandatory JIS G 3125 minimum, but typical values for AR/TMCP SPA-H are ≥27 J at room temperature (20°C); specify Charpy V - notch testing if required for low - temperature applications.
●Bending Performance:
t ≤6 mm: Minimum bending radius = 0.5×t (no outer cracks).
t >6 mm: Minimum bending radius = 1.5×t (no outer cracks).
●Hardness: Brinell hardness (HBW) is usually 130–180 HBW for AR/TMCP plates, consistent with the ferrite - pearlite microstructure.
●Cold - Rolled SPA - H (Thin Strips, ≤3 mm): In the normal cold - rolled (CR) state, yield strength is 20–30% higher than hot - rolled (≈420–450 MPa), tensile strength is ≈520–550 MPa, and elongation is 18–20% (lower than annealed cold - rolled plates).
Key Notes
These are the standard minimums; actual mill test reports (MTRs) may show higher values.
TMCP plates have slightly finer grains than as - rolled ones, which can improve toughness without reducing strength.
For thin strips (<3 mm), a tensile strength of ≥510 MPa is acceptable by mutual agreement between the buyer and supplier.
