G300 steel is a Metallic Coated structural steel in the AS 1397 standard, and the minimum yield strength is 300 MPa. G300 steel is used for roofing, cladding and light steel structure.
The common hot-dip metallic coated of G300 steel is ZINCALUME® and galvanized.
G300 Requirements for chemical composition
| Steel grade designation AS 1397 | Chemical composition (cast analysis), % max. | |||
|---|---|---|---|---|
| Carbon | Manganese | Phosphorus | Sulfur | |
| G300 | 0.3 | 1.6 | 0.1 | 0.035 |
G300 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 | |||||
| G300 | 300 | 340 | 20 | 18 | 180 | t |
G300 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 |
|
| G300 | 0 | 0 | t | t | t | 2t | t | t |
