SPA-H High strength weathering steel plate mechanical property, because the Yield strength, tensile strength and elongation is stable and fluctuation scope small.
SPA-H corten steel plate mainly used at container industry, that because the carbon steel will very easy to corrosion at the air. Then will causes the great economic loss.
The amount of steel used in the container is relatively large, and the thickness between the commonly used specifications is 1.5MM-2.0MM. The common thickness on the market is between 1.5-16MM.
Now SPA-H weathering steel sheet is also more and more used in landscape decoration and garden landscape industry, which reflects its wider use.
SPA-H Weathering steel plate chemical composition
| Grade | C ≤ | Si | Mn | P | S ≤ | Cu | Cr | Ni ≤ |
| SPA-H | 0.12 | 0.25~0.75 | 0.20~0.50 | 0.070~0.150 | 0.04 | 0.25~0.60 | 0.30~1.25 | 0.65 |
SPA-H Weathering resistant steel plate mechanical properties
| Grade | Plate Thickness | Yield strength | Tensile strength | elongation |
| SPA-H | 6.0mm max | min 345 MPa | min 480 MPa | min22 |
| 6.0mm min | min 335 MPa | min 490 MPa | min 15 |
Equivalent Grades
EN 10025-5: In European standards, the closest equivalent to JIS G3125 SPA-H is S355J0WP, weather-resistant steel plate used in similar applications.
ASTM A588: In the U.S., A588 Grade B steel can be considered an equivalent, as it also offers high resistance to atmospheric corrosion and is used for similar structural purposes.
These equivalents provide similar mechanical properties and corrosion resistance to JIS G3125 SPA-H steel plate, although slight differences in chemical composition and mechanical properties might exist depending on the specific standards. Always check the detailed specifications when selecting the material for a project.
When SPA-H weathering steel plate is exposed to the air, it forms a dense oxide film on its surface upon contact with air and moisture. Elements such as copper and nickel adhere to the surface, creating a protective barrier that prevents further external corrosion. Its internal structure remains in good condition for years without damage.
In contrast, ordinary steel plates, when exposed to the environment over the long term, experience oxidation that continuously spreads inward and corrodes the material.
Therefore, the service life of weathering steel is significantly longer than that of ordinary steel plates. From a long-term cost perspective, it is an economical and practical steel grade with significant promotional value.
About Us
Gnee brings strong expertise in architectural facade applications, offering full-cycle technical support – from detailed drawings and rust color control to large-scale fabrication and export logistics. We help ensure every panel fits your project perfectly.
Our services include:
Drawing detailing and sample preparation
Precision fabrication with strict dimensional control
Stable and uniform pre-rusting process
Export-grade packaging and reinforced container loading
Dedicated project manager for quick updates and coordination
Contact now to get SPA-H Quote