SMA400AP Top-Tier Japan Prime Weathering

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SMA400AP Top-Tier Japan Prime Weathering is a premium weathering steel manufactured in Japan that provides excellent resistance to corrosion and long-lasting durability. This steel is specially formulated to withstand harsh weather conditions, making it perfect for outdoor structures and architectural projects. SMA400AP steel is renowned for its distinctive rust-like appearance, which not only enhances its visual appeal but also forms a protective layer that prevents further rusting. JIS G3114 SMA400AP steel is a weather-resistant material made with a combination of copper, chromium, and nickel. The inclusion of phosphorous in SMA400AP grade steel makes it ideal for use in gas flue applications and for decorative facades. SMA400AP steel plates are suitable for use in welded, bolted, or riveted construction of bridges and other structures that require high strength and superior corrosion resistance. Steel products with a W designation should be untreated or stabilized before use, while those with a P designation should be coated prior to use. SMA400AP steel is available in plates, strips, sections, and flats.

JIS G3114 SMA400AP Steel Chemical Composition

SMA400AP (%, by weight)≤0.18≤0.55≤1.25≤0.035≤0.0350.20-0.350.30-0.55

JIS G3114 SMA400AP Steel Mechanical Properties

GradeYield strength MPaTensile strength MPaElongation

Advantages of SMA400AP Top-Tier Japan Prime Weathering

1. Superior Corrosion Resistance: SMA400AP steel is highly resistant to corrosion, making it a durable and long-lasting material for outdoor use.

2. Aesthetic Appeal: The rust-like appearance of SMA400AP steel adds a unique and attractive look to structures, making it a popular choice for architects and designers.

Application Fields of SMA400AP Top-Tier Japan Prime Weathering

1. Architectural Structures: SMA400AP steel is commonly used in the construction of bridges, buildings, and other outdoor structures due to its durability and aesthetic appeal.

2. Outdoor Furniture: The weathering properties of SMA400AP steel make it an ideal material for outdoor furniture that can withstand exposure to the elements.

Features of SMA400AP Top-Tier Japan Prime Weathering

  • High Corrosion Resistance
  • Unique Rust-Like Appearance
  • Durable and Long-Lasting
  • Low Maintenance Requirements

Benefits of Using SMA400AP Top-Tier Japan Prime Weathering

1. Cost-Effective: The long lifespan and low maintenance requirements of SMA400AP steel make it a cost-effective choice for outdoor applications.

2. Environmental Friendly: SMA400AP steel is recyclable and environmentally friendly, making it a sustainable choice for construction projects.

Specifications of SMA400AP Top-Tier Japan Prime Weathering

SMA400AP steel is available in various thicknesses and dimensions to suit different project requirements. It meets the standards set by the Japanese Industrial Standards (JIS) and is manufactured to high-quality specifications.

Uses of SMA400AP Top-Tier Japan Prime Weathering

1. Bridge Construction: SMA400AP steel is commonly used in the construction of bridges due to its high corrosion resistance and durability.

2. Building Facades: The unique appearance of SMA400AP steel makes it a popular choice for building facades that require a weather-resistant material with a modern aesthetic.

Installation and Maintenance of SMA400AP Top-Tier Japan Prime Weathering

Proper installation and maintenance are essential to ensure the longevity and performance of SMA400AP steel. Regular inspections and cleaning can help prevent corrosion and maintain the appearance of the material.


In conclusion, SMA400AP Top-Tier Japan Prime Weathering is a high-quality weathering steel that offers superior corrosion resistance, durability, and aesthetic appeal. Its unique rust-like appearance, along with its environmental benefits and cost-effectiveness, make it a popular choice for outdoor structures and architectural applications. With proper installation and maintenance, SMA400AP steel can provide long-lasting performance and enhance the visual appeal of any project.

Frequently Asked Questions

1. What are the main advantages of using SMA400AP Top-Tier Japan Prime Weathering?

The main advantages of using SMA400AP steel include superior corrosion resistance, unique rust-like appearance, durability, and low maintenance requirements.

2. What are the common applications of SMA400AP Top-Tier Japan Prime Weathering?

SMA400AP steel is commonly used in architectural structures, outdoor furniture, bridge construction, and building facades due to its weathering properties and aesthetic appeal.

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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