SMA490BW Stronger Japan Weathering Alternative

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JIS G3114 SMA490BW steel is a high-strength, low-alloy structural steel that is designed to withstand harsh weather conditions. This steel is often used in construction projects where durability and resilience are paramount, such as bridges, buildings, and infrastructure. With its excellent corrosion resistance and high tensile strength, JIS G3114 SMA490BW steel is a reliable choice for applications that require a long-lasting and sturdy material. Its superior performance in extreme environments makes it a preferred option for engineers and architects looking to create structures that can withstand the test of time. SMA490BW is a high-strength weathering steel developed by Japanese steel manufacturer Nippon Steel Corporation. It is designed to provide superior corrosion resistance and durability compared to traditional carbon steel. This innovative material is often used in construction projects where exposure to harsh weather conditions is a concern, such as bridges, buildings, and outdoor sculptures.

JIS G3114 SMA490BW Steel Chemical Composition

SMA490BW (%, by weight)≤0.180.15-0.65≤1.40≤0.035≤0.0350.30-0.500.45-0.750.05-0.30

JIS G3114 SMA490BW Steel Mechanical Properties

GradeYield strength MPaTensile strength MPaElongation

Advantages of SMA490BW

1. Enhanced Corrosion Resistance: SMA490BW contains alloying elements that form a protective oxide layer on the surface of the steel, preventing rust and corrosion from developing.

2. High Strength: This weathering steel has a higher tensile strength than traditional carbon steel, making it ideal for structural applications that require strength and durability.

Technical Specifications of SMA490BW

SMA490BW is a high-strength, low-alloy steel with a minimum yield strength of 355 MPa. It has excellent weldability and can be easily fabricated into various shapes and sizes. The chemical composition of SMA490BW includes elements such as copper, chromium, and nickel, which contribute to its corrosion-resistant properties.

Features of SMA490BW

  • Weathering Properties: SMA490BW develops a patina over time, giving it a unique aesthetic appeal while also providing additional protection against corrosion.
  • Longevity: Due to its high resistance to corrosion, SMA490BW has a longer lifespan compared to traditional carbon steel, reducing maintenance costs over time.

Benefits of Using SMA490BW

1. Cost-Effective: While SMA490BW may have a higher initial cost than traditional carbon steel, its long-term durability and low maintenance requirements make it a cost-effective choice for many applications.

2. Environmental Sustainability: The weathering properties of SMA490BW eliminate the need for additional protective coatings, reducing the environmental impact of the manufacturing process.


In conclusion, SMA490BW is a high-strength weathering steel alternative that offers superior corrosion resistance, durability, and aesthetic appeal. Its unique properties make it a popular choice for a wide range of applications, from bridge construction to architectural design. By choosing SMA490BW, engineers and architects can ensure the longevity and sustainability of their projects while maintaining a high level of performance.

Frequently Asked Questions

1. Q: Is SMA490BW suitable for marine environments?

A: Yes, SMA490BW is highly resistant to corrosion and is commonly used in marine applications such as bridge construction.

2. Q: How does SMA490BW compare to traditional carbon steel in terms of strength?

A: SMA490BW has a higher tensile strength than traditional carbon steel, making it a preferred choice for structural applications that require strength and durability.

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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