JIS G3125 SPA-H Architectural Weathering Steel

Main Products

Gnee specializes in producing and exporting JIS G3125 SPA-H hot rolled steel, known for its superior atmospheric corrosion resistance. The European equivalent grade for this alloy is S355J0WP (1.8945). SPA-H Architectural Weathering Steel, also known as Corten steel, is a type of steel that is designed to develop a protective rust-like coating over time, which helps to protect the material from corrosion and weathering. This unique characteristic sets it apart from traditional steel materials, making it a popular choice for architectural applications where a weathered look is desired.

JIS G3125 SPA-H Steel Chemical Composition


JIS G3125 SPA-H Steel Mechanical Properties

GradeThickness mmYield point N/mmP2Tensile strengthElongation

Advantages of SPA-H Architectural Weathering Steel

1. Durability: SPA-H steel is highly durable and can withstand harsh weather conditions, making it ideal for outdoor structures.

2. Aesthetic appeal: The rust-like patina that develops on SPA-H steel gives it a unique and attractive appearance that adds character to architectural designs.

Characteristics of SPA-H Architectural Weathering Steel

1. Corrosion resistance: SPA-H steel is designed to develop a protective layer of rust that acts as a barrier against further corrosion, extending the lifespan of the material.

2. Low maintenance: Once the protective patina has formed, SPA-H steel requires minimal maintenance, saving time and resources in the long run.

Application Fields of SPA-H Architectural Weathering Steel

1. Building facades: SPA-H steel is commonly used in building facades to create a weathered look that blends seamlessly with the surrounding environment.

2. Sculptures and art installations: The unique appearance of SPA-H steel makes it a popular choice for sculptures and art installations that require a weathered aesthetic.

Benefits of Using SPA-H Architectural Weathering Steel

When it comes to architectural projects, using SPA-H Architectural Weathering Steel offers a range of benefits that make it a preferred choice for designers and architects.

1. Longevity

One of the key advantages of using SPA-H steel is its longevity. The protective rust-like coating that develops on the surface of the material acts as a barrier against corrosion, extending the lifespan of the steel and reducing the need for frequent maintenance.

2. Aesthetic Appeal

SPA-H steel is known for its unique and attractive appearance, thanks to the natural rust-like patina that forms over time. This weathered look adds character and charm to architectural designs, making them stand out from traditional steel structures.

3. Environmental Sustainability

SPA-H Architectural Weathering Steel is a sustainable choice for architectural projects due to its long lifespan and low maintenance requirements. By using a material that requires minimal upkeep and has a reduced environmental impact, designers can create sustainable and eco-friendly structures.

4. Versatility

SPA-H steel is a versatile material that can be used in a wide range of architectural applications, from building facades to sculptures and art installations. Its weathered appearance blends well with natural surroundings, making it a popular choice for projects that aim to harmonize with the environment.


In conclusion, SPA-H Architectural Weathering Steel offers a range of benefits for architectural projects, including durability, aesthetic appeal, and environmental sustainability. By choosing SPA-H steel, designers and architects can create unique and long-lasting structures that stand the test of time.

Frequently Asked Questions

1. Q: Is SPA-H Architectural Weathering Steel suitable for all weather conditions?

A: Yes, SPA-H steel is designed to withstand a variety of weather conditions, making it a versatile choice for outdoor applications.

2. Q: How long does it take for the protective patina to form on SPA-H steel?

A: The time it takes for the protective rust-like coating to develop on SPA-H steel can vary depending on environmental factors, but it typically forms within a few months to a year.

Why Choose Gnee Steel

If you want to find a trustable steel products manufacturer, Gnee will be your best choice. 15 years of experience steel products manufacturer, certified by the classification society, CE, ISO, and SGS. And we guarantee the highest safety and quality standards. We fulfill all requirements of reputed classification societies.

In addition, our steel has been successfully exported to more than 60 countries such as Germany, South Korea, the United States, Mexico, and Argentina. Many regular customers come to visit our company and factory and make multiple orders.

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What Services Does Gnee Provide?
  • Dimensional Inspection: Length, width, diameter; Thickness, straightness; Flatness, profile;
  • Surface Inspection: Visual inspection; Roughness testing; Coating thickness measurement;
  • Composition Testing: Interstitial elemental analysis - C,S,P, Si; Alloy grading verification; Inclusion rating;
  • Mechanical Testing: Tensile strength, yield strength; Toughness, ductility; Hardness testing;
  • Flaw Detection: Ultrasonic, radiographic testing; Magnetic particle, dye penetrant testing;
  • Documentation: Inspection reports; Test certificates; Material traceability
  • CNC machining - turning, milling, drilling
  • Surface treatments like polishing
  • Heat treatments - quenching, annealing
  • Wet/powder coating
  • Waterjet cutting
  • Laser cutting
  • Plasma cutting
  • Shearing/punching
Molding and Manufacturing1
  • Rolling
  • Press braking
  • Plate bending - concave & convex
  • Profile bending -custom fabrication as per drawings
  • Chemical analysis
  • Mechanical testing
  • Non-destructive examination
  • Ultrasonic, radiography testing

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