Free Steel Grade Calculator — Select By Standard
Select the optimal steel grade for your structural application by comparing mechanical properties, weldability, toughness requirements, and cost across international standards. The calculator covers US (ASTM), European (EN), Australian (AS), and Canadian (CSA) structural steel grades with their corresponding design strengths (Fy and Fu), ductility ratings, and application guidance.
Steel Grade Comparison
| Standard | Grade | Fy (ksi) | Fu (ksi) | Typical Use |
|---|---|---|---|---|
| ASTM A992 | W-shapes | 50 | 65 | Standard beams and columns |
| ASTM A572 Gr 50 | Plates, HSS | 50 | 65 | General structural |
| ASTM A36 | Shapes, plates | 36 | 58 | Light framing, base plates |
| ASTM A913 | Quenched W-shapes | 50-65 | 65-80 | High-ductility seismic |
| EN 10025 S235 | European | 33 (235 MPa) | 51 (360 MPa) | Light structures |
| EN 10025 S355 | European | 50 (355 MPa) | 62 (430 MPa) | Standard Euro structures |
| AS 3678 300PLUS | Australian | 50 (300 MPa) | 60 (440 MPa) | Standard Australian |
| AS 3678 350W | Australian | 50 (350 MPa) | 62 (480 MPa) | Heavy Australian |
| CSA G40.21 350W | Canadian | 50 (350 MPa) | 65 (480 MPa) | Standard Canadian |
| CSA G40.21 300W | Canadian | 44 (300 MPa) | 60 (450 MPa) | Light Canadian |
How to Use
- Select your design code: AISC 360, EN 1993, AS 4100, or CSA S16.
- Choose structural element: beam, column, tension member, or connection.
- Set design criteria: strength, ductility, weldability, toughness.
- Compare grades: mechanical properties, availability, cost index.
- Review recommendations: best-match grade with code-compliant Fy/Fu values.
Grade Selection Guidelines
- Standard building frames: A992 (US), S355 (EU), 300PLUS (AU), 350W (CA)
- Seismic/welded moment frames: A913 Gr 65 (US), S355 N/NL (EU), 350W (CA)
- Base plates and connection plates: A36 (US), S235 (EU), 250 (AU), 300W (CA)
- High-strength columns: A992 (US), S460 (EU), 400 (AU), 350W (CA)
Frequently Asked Questions
What is the difference between A36 and A992 steel? A992 (Fy=50 ksi) is 39% stronger in yield than A36 (Fy=36 ksi) for roughly 5-10% higher material cost. A992 has tighter carbon equivalent (CE) limits for better weldability and is the default specification for W-shapes in the US. A36 is still used for plates, angles, and base plates where the lower strength is adequate and cost savings matter.
What does the steel grade number mean (e.g., S355, 350W)? For EN 10025, the number after S is the minimum yield strength in MPa — S355 has Fy = 355 MPa (50 ksi). For ASTM, A992 and A572 Gr 50 have Fy = 50 ksi. For AS 3678, 350W has Fy = 350 MPa (50 ksi). For CSA G40.21, 350W has Fy = 350 MPa (50 ksi). European grades also include impact toughness classes: JR (27J at 20C), J0 (27J at 0C), J2 (27J at -20C).
When should you specify notch-tough steel? Notch-tough (Charpy V-notch tested) steel is required per AISC 341-22 for seismic force-resisting system members in Seismic Design Categories D, E, and F. It is also specified for low-temperature applications (below 50F), dynamically loaded structures (crane runways, bridges), and through-thickness connections where lamellar tearing is a concern.
Is this steel grade selection tool free? Yes, completely free with unlimited calculations.
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Disclaimer (educational use only)
This page is provided for general technical information and educational use only. It does not constitute professional engineering advice. All structural designs must be verified by a licensed Professional Engineer (PE) or Structural Engineer (SE). The site operator disclaims liability for any loss or damage arising from the use of this page.