ASTM A572 Grade 50 vs S355ML: 82% composition overlap. Some similarities but notable differences in alloying elements.
ASTM A572 Grade 50 vs S355ML
Side-by-side chemical composition and mechanical property comparison.
Overview
ASTM A572 Grade 50
The most widely used structural steel grade in the United States. 345 MPa (50 ksi) yield strength HSLA steel. Has largely replaced A36 for structural applications due to higher strength-to-weight ratio. Used for building frames, bridges, heavy equipment, and general structural fabrication.
S355ML
1.8834
Thermomechanically rolled fine-grain structural steel — ReH >=355 MPa with Charpy at -50°C (KV >=27J). THE workhorse for large welded steel structures in cold environments. TM rolling = low CEV = excellent weldability even in thick plate. Used for offshore platforms, wind turbine towers, bridges, crane structures, and pressure vessels. Most common TM grade by tonnage.
| ASTM A572 Grade 50 | S355ML | |
|---|---|---|
| Material Number | — | 1.8834 |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A572 | EN 10025-4 |
Chemical composition (wt%)
| Element | ASTM A572 Grade 50 | S355ML | Overlap |
|---|---|---|---|
| C | 0–0.23% | 0–0.14% | OK |
| Si | 0–0.4% | 0–0.5% | OK |
| Mn | 0–1.35% | 0–1.6% | OK |
| P | 0–0.04% | — | — |
Mechanical properties
| Property | ASTM A572 Grade 50 | S355ML | Unit |
|---|---|---|---|
| tensile_strength | ≥ 450 | 450–610 | MPa |
| yield_strength | ≥ 345 | ≥ 355 | MPa |
| elongation | ≥ 18 | ≥ 22 | % |
Compatibility Assessment
ASTM A572 Grade 50 and S355ML share some characteristics (82% overlap) but have notable differences. They may be substitutable in some applications but not all. Verify suitability carefully.
Automated assessment based on composition analysis
Frequently Asked Questions
Is ASTM A572 Grade 50 the same as S355ML?
ASTM A572 Grade 50 and S355ML have a 82% composition overlap. For most purposes, they can be considered similar.
Can I replace ASTM A572 Grade 50 with S355ML?
In many cases, yes. The compositions overlap significantly (82%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between ASTM A572 Grade 50 and S355ML?
The main differences are in the following elements: overall alloying content. ASTM A572 Grade 50 is a Carbon Steel grade, while S355ML is a Carbon Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.