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Galvanized Prepainted GI Corrugated Sheet

Thinkness/ mm: 0.12~0.8

Width/ mm: WAVES: 762mm/680,670,660,655,650mm 9 waves

914mm/815,810,790,780mm 11 waves

1000mm/930 915,910,905,900,880,875mm 12 or 14 waves

TRAPEZOID：686mm, 750mm, 820mm, 840mm, 900mm, 1025mm, 1050mm or customized

Length/ mm: 1.5-11.8

Zinc coating: 30-275g/m2

Coating thickness: Top side 15-25 micro; Back side 5-15 micro

Quality inspection: ISO9001; COC; CE; SGS standard

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Product Details

Mechanical Property Optimization
Pre-painted coils are engineered for specific mechanical properties via cold reduction (30-80%) and annealing (recrystallization at 710-820°C). Steel grades range from:

Commercial Steel (CS): Yield strength 180-300MPa, elongation 22-36%
Structural Steel (SS): YS 280-500MPa, elongation 14-20%
High Strength Low Alloy (HSLA): YS 340-550MPa with microalloying (Nb,V,Ti)

Tensile testing (ASTM A370) confirms property consistency within ±10MPa. Bake-hardenable grades (e.g., HCT600X) gain 40-60MPa YS during paint curing. Critical forming parameters include:

n-value (strain hardening): 0.18-0.24 for deep drawing
r-value (anisotropy): 1.4-2.2 for earring control
Planar anisotropy (Δr): <0.4 for uniform deformation

Finite element analysis (FEA) simulates forming limits: HSLA grades achieve 20% stretch flangeability (λ-value) versus 12% for CS. Coating adhesion remains >9MPa after 10% straining (ISO 16805). This optimization enables complex geometries like refrigerator cabinets formed from single pre-painted blanks.

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