JIS G3125 SPA-H is a high-quality weathering steel widely supplied in China, offering excellent performance at competitive prices.
This steel grade is alloyed with small amounts of copper, chromium, nickel, and phosphorus, which significantly enhance its mechanical strength and atmospheric corrosion resistance compared with ordinary carbon steel.
Due to the synergistic effect of these alloying elements, SPA-H steel forms a dense and stable protective oxide layer on its surface when exposed to the atmosphere.
This natural patina effectively slows down further corrosion, reduces maintenance costs, and extends service life, making it an ideal material for long-term outdoor applications.
JIS G3125 SPA-H weathering steel is widely used in marine containers, freight containers, bridges, railway tracks, and other structural components that require high strength and superior corrosion resistance.
It is also suitable for various structural applications in harsh environments where durability and reliability are critical.
JIS G3125 SPA-H Chemical Composition (wt.%)
| Grade | C max | Si | Mn | P | S max | Cu | Cr | Ni max |
|---|---|---|---|---|---|---|---|---|
| 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 |
JIS G3125 SPA-H Mechanical Properties
| 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% |
Gnee is a professional exporter and stockist of JIS G3125 SPA-H weathering steel in China, maintaining over 1,000 tons of regular stock every month to ensure fast delivery and stable supply.
If you are looking for competitive prices, reliable quality, or detailed technical information such as chemical composition and mechanical properties of JIS G3125 SPA-H steel, please feel free to contact us at any time. Our team is ready to support your project requirements.
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
