Quick Answer
Quick Answer
AS/NZS 3678 covers hot-rolled structural steel plates, floorplates, and slabs in grades 200, 250, 300, 350, 400, and WR350. Each grade above 200 offers L0 (0 °C Charpy) and L15 (−15 °C Charpy) sub-grades. Grade 350 has a minimum yield strength of 360 MPa at ≤ 11 mm and 340 MPa at 11–17 mm, with 480 MPa tensile strength.
AS/NZS 3678 is the primary Australian and New Zealand standard for hot-rolled structural steel flat products — plates, floorplates, and slabs.
Scope and Applicability
AS/NZS 3678 applies to hot-rolled flat products, structural applications in buildings, bridges, cranes, and offshore platforms, products with nominal thickness from 3 mm to 140 mm, and all grades supplied in as-rolled or normalised condition.
Grade Coverage
AS/NZS 3678 specifies six grade families with numeric designators approximating minimum yield strength in MPa for thin product.
| Grade | Sub-grades | Impact Test Temperature | Typical Application |
|---|---|---|---|
| 200 | (none) | Not required | Light structural, general fabrication |
| 250 | L0, L15 | 0 °C / −15 °C | General structural, building frames |
| 300 | L0, L15 | 0 °C / −15 °C | Medium structural, bridges |
| 350 | L0, L15 | 0 °C / −15 °C | Heavy structural, high-rise buildings |
| 400 | L0, L15 | 0 °C / −15 °C | High-strength structural, crane booms |
| WR350 | L0, L15 | 0 °C / −15 °C | Weathering steel, exposed structures |
Ready to automate your certificate workflow?
Try TestCert free