S550GD / Equivalents
Is it really S550GD? 2 “equivalents” checked
Cross-reference tables pair grades by name and history. Here each pairing is judged on the minimum values each standard guarantees, with the sources for both sides.
Same strength class; guaranteed values agree within a few MPa. Still check thickness bands and impact quality.
G550Standards Australia
A653 SS Grade 80ASTM
Same class of steel, but at least one guaranteed value is lower or tested differently. Recheck the design.
Commonly listed as an equivalent, but the guaranteed values do not support substitution.
Side by side
| Grade | Standard | Min. yield at 10 mm | Tensile at 10 mm | Match | What differs |
|---|---|---|---|---|---|
| S550GD |  EN 10346:2015 | ≥ 550MPa1 | ≥ 560MPa1 | — | Reference grade. |
| G550 | AS 1397 | ≥ 550MPa1 | ≥ 550MPa1 | Close match | Same 550 MPa yield; tensile 550 MPa (vs 560). AS/NZS 4600 reduces G550 below 0.9 mm to 75 % of its strength in design. |
| A653 SS Grade 80 | ASTM A653/A653M | ≥ 550MPa1 | ≥ 570MPa1 | Close match | 550 MPa (80 ksi) yield, 570 MPa (82 ksi) tensile, no elongation requirement. |