G450 steel to AS 1397 is a cold-reduced sheet steel with in-line galvanizing. Its grade is 450 MPa yield and 480 MPa tensile strength. It is widely used in Australia for purlins, and is being used to fabricate lightweight portal frames, often by welding.
G450 steel can be applied to Z, ZF, ZA, ZM, AZ, AM hot dip metallic coatings.
G450 Requirements for Chemical Composition
| Steel grade designation AS 1397 |
Chemical composition (cast analysis), % max. | |||
|---|---|---|---|---|
| Carbon | Manganese | Phosphorus | Sulfur | |
| G450 | 0.2 | 1.2 | 0.04 | 0.03 |
G450 Mechanical property requirements
| Steel grade designation |
Longitudinal tensile test | Transverse bend test | ||||
|---|---|---|---|---|---|---|
| Min. yield strength MPa |
min. tensile strength MPa |
Min.elongation,% | Angle of bend degrees | Diameter of mandrel in terms of test piece thickness (t) | ||
| Lo = 50 mm | Lo = 80 mm | |||||
| G450 | 450 | 480 | 10 | 9 | 90 | 4t |
G450 Coating Adhesion (180° bend test) requirements
| Steel grade designation | Diameter of mandrel in terms of thickness of product (t) | |||||||
|---|---|---|---|---|---|---|---|---|
| Coating class | ||||||||
| "Z", "ZA", "ZF" and "ZM" | "AZ" and "AM" | |||||||
| Z100, ZA90 ZF80 ZF100 |
Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180 |
Z275, ZA225, ZA275, ZM220, ZM275 |
Z350, ZA350, ZM350 |
Z450, ZA450, ZM450 |
Z600 | AZ150, AM100, AM125, AM150 |
AZ200, AM175, AM200 AM225 |
|
| G450 | 0 | t | 2t | 2t | 2t | 3t | 2t | 2t |
Cold-reduced galvanized steel
G450 Steel
