Chemical Composition of JIS G 3125 SPA-H (wt.%)
| 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 | 0.040 | 0.25–0.60 | 0.30–1.25 | 0.65 |
SPA-H is a copper-chromium-nickel alloyed weathering steel. The optimized alloy composition enables the formation of a dense protective oxide layer on the steel surface, significantly improving atmospheric corrosion resistance.
Mechanical Properties of JIS G 3125 SPA-H
| Grade | Plate Thickness | Yield Strength | Tensile Strength | Elongation |
|---|---|---|---|---|
| SPA-H | ≤ 6.0 mm | ≥ 345 MPa | ≥ 480 MPa | ≥ 22% |
| SPA-H | ＞ 6.0 mm | ≥ 335 MPa | ≥ 490 MPa | ≥ 15% |
These mechanical properties ensure a good balance between strength, ductility, and durability, making SPA-H suitable for both structural and load-bearing applications.
Applications of JIS G 3125 SPA-H Corten Steel Plates
IS G 3125 SPA-H Corten steel plates are extensively used in applications that demand excellent atmospheric corrosion resistance and reliable structural performance, such as air preheaters, economizers, bridge construction, infrastructure projects, building structures, architectural facades, railway carriages, rolling stock, shipping containers, container frames, and outdoor industrial equipment.
The formation of a stable rust patina on the surface provides long-term protection against corrosion and significantly reduces maintenance requirements over the service life.
Available Additional Conditions & Tests
SPA-H steel plates can be supplied with various processing conditions and inspections, including:
UT – Ultrasonic Examination
AR – As Hot Rolled
TMCP – Thermo-Mechanical Control Processing
N – Normalized
Q+T – Quenched and Tempered
Z-direction test – Z15 / Z25 / Z35
Charpy V-Notch Impact Test
Third-party inspection – SGS, BV, TUV, etc.
Surface treatment – Coated, shot blasting, or painting
Packaging, Delivery & Supply Information
Packaging: Standard export seaworthy packing or as required
Delivery Time:
Stock goods: approx. 7 days
Production orders: 30–50 days
Loading Ports: Shanghai, Tianjin, Qingdao
Supply Ability: 5,000 MT per month
MOQ: 1 piece
Q1: What is SPA-H Corten steel?
SPA-H is a Japanese standard weathering steel grade specified in JIS G 3125. It contains alloying elements such as copper, chromium, and nickel, which allow it to form a dense protective rust layer on the surface. This patina significantly slows down further corrosion and improves long-term durability in atmospheric environments.
Q2: What are the main advantages of SPA-H weathering steel?
The key advantages of SPA-H steel include excellent atmospheric corrosion resistance, high strength, and low maintenance cost. Unlike ordinary carbon steel, SPA-H does not require frequent painting or coating, which helps reduce lifecycle costs while maintaining a unique natural appearance.
Q3: Where is SPA-H Corten steel commonly used?
SPA-H steel is widely used in bridges, building structures, architectural façades, railway carriages, containers, air preheaters, and economizers. It is especially suitable for outdoor structures exposed to changing weather conditions for long periods.
Q4: Does SPA-H steel need painting or surface treatment?
In most outdoor applications, no additional painting is required. SPA-H naturally forms a stable rust layer after exposure to the atmosphere. However, in highly corrosive environments (such as marine or high-salt areas), additional surface protection may be recommended to extend service life.
Q5: How long does it take for SPA-H steel to form a stable patina?
Under normal atmospheric conditions, SPA-H steel typically forms a stable protective patina within 6 to 24 months
