When international buyers source ASTM A572 Grade 50 H beam, one of the most common questions is: what is the equivalent material in other standards such as EN, JIS, or GB?
ASTM A572 Grade 50 H beam
The answer is not a simple one-to-one substitution. While several steels are considered equivalent to A572 Grade 50 H beam, they differ slightly in chemical composition, yield strength, and application standards.
In global projects, the most commonly accepted equivalent is S355 structural steel under the EN standard.
| Standard | Equivalent Grade | Yield Strength |
|---|---|---|
| ASTM (USA) | A572 Grade 50 | ≥ 345 MPa |
| EN (Europe) | S355JR / S355J2 | ≥ 355 MPa |
| JIS (Japan) | SM490 | ≥ 325–355 MPa |
| GB (China) | Q345B / Q355B | ≥ 345 MPa |
From this comparison, you can see that most A572 Grade 50 equivalents fall within the 345–355 MPa strength range, which is why they are often considered interchangeable in structural applications.
Why S355 Is the Closest Equivalent to A572 Grade 50 H Beam
Among all international standards, S355 steel (especially S355J2) is the most frequently used substitute for A572 Gr50 H beam in Europe, the Middle East, and Africa.
| Property | A572 Gr50 H Beam | S355J2 |
|---|---|---|
| Yield Strength | ≥ 345 MPa | ≥ 355 MPa |
| Impact Test | Not always required | Required at -20°C |
| Standard | ASTM | EN 10025 |
The slightly higher yield strength of S355 makes it a practical alternative, especially in projects requiring compliance with European standards.
However, S355 often includes stricter impact testing requirements, which can make it more suitable for low-temperature environments
.
Are A572 Gr50 and S355 Fully Interchangeable?
Although many buyers treat them as equivalents, A572 Grade 50 H beam and S355 are not completely identical.
Key differences include:
- Standard system (ASTM vs EN)
- Impact testing requirements
- Chemical composition limits
- Certification and project specifications
In practice, substitution is common, but it typically requires:
- Engineer approval
- Design verification
- Compliance with local building codes
Equivalent Steel in Asia: SM490 and Q345/Q355
For projects in Asia, buyers often compare A572 Gr50 H beam with JIS and GB standards.
| Grade | Region | Key Feature |
|---|---|---|
| SM490 | Japan | Good weldability, widely used in structures |
| Q345B | China | Traditional equivalent to A572 Gr50 |
| Q355B | China | Updated standard with improved properties |
Among these, Q355B is now closer to A572 Grade 50 in terms of performance, especially after China updated its steel standards.
Practical Buying Insight: "Equivalent" Does Not Mean "Identical"
A common mistake in procurement is assuming all equivalents behave the same.
In reality:
Equivalent steels share similar strength levels
But differ in certification, toughness, and application standards
For example:
A project in Europe may reject A572 even if strength matches
A project in the US may require strict ASTM certification
What Is A572 Grade 50 H Beam Equivalent To?
ASTM A572 Grade 50 H beam is commonly equivalent to:
- S355JR / S355J2 (EN standard)
- SM490 (JIS standard)
- Q345B / Q355B (GB standard)
Among these, S355 is the closest and most widely recognized international equivalent.
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Is A572 easy to weld?
A572-50 steel can be welded with simple procedures and common consumables such as E7018 welding rod.
What is the flatness tolerance for astm A572 Grade 50?
Thickness, width and length tolerances for A572, Grade 50 plates are in accordance with ASTM A6. ASTM A6 Half-Standard Flatness tolerances are available for plate thicknesses of 3/8 inches to 3.0 inches. Inquire for specific mill flatness capabilities.
What is the difference between A709 GR 50 and A572 GR 50?
A572 Grade 50 contains more C and slightly higher Mn content. Whereas, the A709 gr50 plates contains additional alloying. A572 Grade 50 is used in general construction and engineering applications. Whereas, ASTM A709 grade 50 plates is used in bridge construction and other structural applications.
What is the difference between astm A572 GR 50 and S355J2?
*ASTM A572 Gr. 50 requires Charpy V-notch testing only if specified (common in cold climates). S355J2 guarantees superior low-temperature toughness due to stricter impact testing.