ASTM A588 (Corten) vs ASTM A572 Grade 50: Same yield strength — A588 adds weathering corrosion resistance
ASTM A588 (Corten) vs ASTM A572 Grade 50
Side-by-side chemical composition and mechanical property comparison.
Overview
ASTM A588 (Corten)
High-strength low-alloy weathering steel. Forms a stable protective rust patina eliminating the need for paint. Cu-Cr-Ni-V composition provides 4-8x atmospheric corrosion resistance vs carbon steel. Used for unpainted bridges, architectural facades, sculptures, outdoor structures, and freight cars.
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.
| ASTM A588 (Corten) | ASTM A572 Grade 50 | |
|---|---|---|
| Material Number | — | — |
| Category | Carbon Steel | Carbon Steel |
| Standard | ASTM A588 | ASTM A572 |
Chemical composition (wt%)
| Element | ASTM A588 (Corten) | ASTM A572 Grade 50 | Overlap |
|---|---|---|---|
| C | 0–0.19% | 0–0.23% | OK |
| Si | 0.3–0.65% | 0–0.4% | Partial |
| Mn | 0.8–1.25% | 0–1.35% | OK |
| P | 0–0.04% | 0–0.04% | OK |
Mechanical properties
| Property | ASTM A588 (Corten) | ASTM A572 Grade 50 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 485 | ≥ 450 | MPa |
| yield_strength | ≥ 345 | ≥ 345 | MPa |
| elongation | ≥ 18 | ≥ 18 | % |
Compatibility Assessment
Both have 345 MPa yield. A588 adds Cu/Cr/Ni/V for a protective patina that eliminates painting. A572-50 is ~15% cheaper. Choose A588 for unpainted outdoor structures; A572-50 for painted/indoor.
Frequently Asked Questions
Is ASTM A588 (Corten) the same as ASTM A572 Grade 50?
ASTM A588 (Corten) and ASTM A572 Grade 50 have a 75% composition overlap. Same yield strength — A588 adds weathering corrosion resistance
Can I replace ASTM A588 (Corten) with ASTM A572 Grade 50?
In many cases, yes. The compositions overlap significantly (75%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between ASTM A588 (Corten) and ASTM A572 Grade 50?
The main differences are in the following elements: Si. ASTM A588 (Corten) is a Carbon Steel grade, while ASTM A572 Grade 50 is a Carbon Steel grade.
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