SA572 Grade 50: Equivalent Grades & Standards
SA572 Grade 50 is a North American HSLA (High-Strength Low-Alloy) steel. Finding a direct "equivalent" depends on matching its key characteristics: 50 ksi (345 MPa) minimum yield strength, microalloyed (Cb/V) chemistry, and as-rolled condition.
What is SA572 Grade 50 Corten Steel Plates?
SA572 Grade 50 is a High-Strength Low-Alloy (HSLA) Columbium-Vanadium structural steel, known for excellent strength-to-weight ratio, minimum 50 ksi yield strength, good weldability, and increased atmospheric corrosion resistance, making it a versatile "workhorse" for heavy-duty applications like bridges, buildings, and infrastructure components where lighter, stronger material is needed.
SA572 Grade 50 Specifications
| Specification | ASTM A572 / ASME SA572 |
|---|---|
| Grade | Grade 50 (A572 Gr 50) |
| Thickness | 6mm to 150mm (as per availability) |
| Width | 1000mm to 4500mm (as per availability) |
| Length | 3000mm to 18000mm (as per availability) |
| Supply Condition | As Rolled, Normalized Rolled, Thermo-Mechanically Controlled Processed (TMCP), Quenched and Tempered (Q&T) |
| Relevant Standard | ASTM A6/A6M (General Requirements for Rolled Structural Steel) |
SA572 Grade 50 Chemical Composition
| Element | Max % (for plates up to 1.5″ or 40mm thick) |
|---|---|
| Carbon (C) | 0.23 |
| Manganese (Mn) | 1.35 |
| Phosphorus (P) | 0.04 |
| Sulfur (S) | 0.05 |
| Silicon (Si) | 0.40 |
| Columbium (Nb) | 0.005 – 0.05 |
| Vanadium (V) | 0.01 – 0.15 |
SA572 Grade 50 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 65 ksi min (450 MPa min) |
| Yield Strength | 50 ksi min (345 MPa min) |
| Elongation (in 8 in) | 18% min |
| Elongation (in 2 in) | 21% min |
SA572 Grade 50 Equivalent Grades & Standards
| Standard | Grade / Designation | Notes |
|---|---|---|
| ASTM | A572 Grade 50 | Primary Standard |
| ASME | SA572 Grade 50 | Similar to ASTM for pressure vessel applications |
| EN 10025-2 | S355JR / S355J0 / S355J2 | Often considered a European equivalent, but properties and chemistries can vary. Verify specific needs. |
| Indian Standard (IS) | IS 2062 E350 (A, B, C, BR, B0) | A common ASTM A572 Grade 50 equivalent Indian Standard. Grade variations (A, B, C, BR, B0) denote different quality levels regarding impact testing and forming. |
| JIS G3106 | SM490A / SM490B / SM490YB | Japanese standard, similar strength levels. |
| DIN 17100 | St 52-3 | Older German standard, often cross-referenced with S355. |
Important Distinctions for Specification
1.A992 vs. SA572 Grade 50: For structural shapes (I-beams, channels) in the US, A992 is the default and preferred specification over SA572 Gr.50. It is essentially a "qualified" version of Grade 50 with guaranteed toughness and tighter chemistry for better weldability. When designing a building, you specify A992 for shapes and SA572 Gr.50 for plates.
2.A709 Grade 50: For bridge construction in the US, this is the mandatory, code-listed specification. It is chemically and mechanically the same as SA572 Gr.50 but includes mandatory impact testing and is governed by AASHTO.
3.European S355 vs. SA572 Grade 50: While S355JR/J2 is the standard match, note a key philosophical difference:
SA572 Gr.50: Performance-based, allows flexibility in chemistry to achieve strength via microalloying (Cb/V).
S355J2: Composition-based, with strict element limits and defined as a killed steel.
4.Toughness: A critical difference. SA572 Gr.50 does not require impact testing unless specified. Its European (S355J2) and bridge (A709 Gr.50) equivalents do require it by default. For cold-climate applications, always add the supplementary requirement "Impact Tested per S5" to your SA572 Gr.50 order.
1. What is the primary advantage of SA572 Grade 50 over A36 steel?
Its main advantage is a 50% higher yield strength (50 ksi vs. 36 ksi), allowing for lighter, more efficient structural designs with significant material savings at only a modest cost increase.
2. How does SA572 Grade 50 achieve its higher strength?
It is a High-Strength Low-Alloy (HSLA) steel strengthened primarily through microalloying with Columbium (Nb) and Vanadium (V) during controlled hot-rolling, without requiring heat treatment.
3. Is SA572 Grade 50 suitable for welding?
Yes, it has good weldability using standard low-hydrogen processes. Pre-heating is recommended for thicker sections, but it is far less complex to weld than quenched & tempered high-strength steels.
4. What is the most common application for SA572 Grade 50?
It is the go-to material for optimized building construction, widely used in columns, beams, and trusses where reducing member size and weight provides economic and performance benefits.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
