Product Specification

0.75BMT*188 Galvanized Steel Coil SGC570 Structural Steel Used For Light Steel Villa And Frame Houses

Light steel villa, also known as light steel structure house, its main material is the light steel keel synthesised by hot-dip galvanised steel strip through cold rolling technology, after precise calculation plus the support and combination of auxiliary parts, to play a reasonable bearing capacity to replace the traditional house.

Light steel structure low-rise residential construction technology is evolved on the basis of North American-style wood structure construction technology, after more than a century of development, has formed a mature construction system with excellent physical properties, flexible space and form, easy to build, and various forms.

In North America, which is regarded as the best habitat in the world, more than 95% of low-rise civil buildings, including residential buildings, shopping malls, schools, office buildings, etc., are constructed with wood or lightweight steel structures (even including our close neighbours Japan and South Korea). North America's wood and lightweight steel structures occupy an absolute advantage in the entire construction market.

The performance requirements for galvanized steel used in light steel frame houses are critical to ensure the structural integrity, durability, and long-term performance of the building. Light steel frame construction typically involves the use of cold-formed galvanized steel for framing, which offers strength, flexibility, and resistance to the elements. The following are key performance requirements for galvanized steel used in this application:

1. Corrosion Resistance

• Galvanized steel used in light steel frame houses must have a strong zinc coating to protect the steel from corrosion caused by moisture, air, and environmental conditions.
• Coating thickness is critical for ensuring longevity, especially in areas with high humidity, exposure to rain, or coastal regions where salt in the air can accelerate corrosion.
  • Coating weights like Z275 (275 grams per square meter) are commonly used for light steel framing in residential and commercial construction, although thinner coatings (e.g., Z120) may be sufficient for indoor environments.
  • The zinc coating should be uniform, free from defects like zinc flowers or cracks, and properly bonded to the steel to prevent corrosion under the surface.

2. Mechanical Properties

• Strength and Durability: The galvanized steel must meet specific strength requirements to ensure the frame can bear the loads placed on it. The tensile strength, yield strength, and elongation must meet the demands of the building’s structure.
  • Cold-formed steel used in light steel frames typically has a tensile strength ranging from 300 MPa to 550 MPa, depending on the grade of steel used.
• Formability: The steel should have good workability to allow for easy cold-forming, bending, and assembly of the steel frame components. This ensures ease of construction and minimizes damage to the galvanized coating during fabrication.
• Fatigue Resistance: Light steel frames are subject to repetitive loads over time (such as wind or seismic activity). The steel should exhibit fatigue resistance to maintain its performance over the building’s lifespan.

3. Dimensional Accuracy and Flatness

• Plate Shape: Since light steel framing materials are often used in long, straight sections, the steel sheets or coils must have excellent dimensional stability and flatness. Any warping or unevenness can lead to difficulties during construction and compromise the overall appearance and functionality of the structure.
• The tolerance for flatness and straightness must meet specific standards to ensure the materials fit together properly without excessive gaps or misalignment during installation.

4. Impact Resistance and Toughness

• The galvanized steel should be tough and resistant to impact damage during transportation and installation. This is especially important in light steel framing, where the steel is often handled in long sections and may be exposed to mechanical stresses.
• The material should also have sufficient toughness to resist cracking or breaking under typical construction loads or accidental impacts during the building process.

5. Surface Quality

• The surface of the galvanized steel must be smooth, clean, and free from surface defects (e.g., scratches, rust spots, or oil stains). A smooth surface is essential for easy painting or coating in case additional finishes are required, such as powder coating or protective primers.
• For aesthetic applications, the steel should have a uniform, clean appearance, especially in visible areas of the structure.

6. Fire Resistance

• Galvanized steel itself is inherently fire-resistant and does not burn or emit toxic gases. However, it is important to ensure that the steel framing complies with local building codes and fire safety standards. While steel does not catch fire, its thermal conductivity can cause it to lose strength at high temperatures, so fire-resistant coatings or insulation may be required for certain applications.

7. Sustainability and Environmental Considerations

• The galvanized steel should meet environmental standards, such as RoHS (Restriction of Hazardous Substances) or REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals), ensuring that the material does not contain harmful substances that could affect human health or the environment.
• Additionally, galvanized steel is highly recyclable, which is a significant advantage in sustainable construction practices. Builders often prefer galvanized steel for its long-term durability and ability to be reused or recycled at the end of the building's life cycle.

8. Thermal and Acoustic Insulation Compatibility

• Although galvanized steel itself does not provide thermal or acoustic insulation, it should be compatible with insulation materials used in light steel frame houses. Steel framing must be designed to accommodate insulation materials effectively to provide the required thermal resistance (R-value) and soundproofing (STC) properties.

9. Compliance with Standards and Codes

• The galvanized steel used must comply with various international and local standards for building materials and construction. For example:
  • ASTM A653 for hot-dip galvanized steel sheet in the U.S.
  • EN 10346 for galvanized steel sheet in Europe.
  • JIS G3302 for galvanized steel in Japan.
• Compliance with these standards ensures that the steel meets the necessary quality, performance, and safety requirements for use in construction.

Summary of Key Performance Requirements for Galvanized Steel in Light Steel Frame Houses:

1. Corrosion resistance (adequate zinc coating thickness like Z120 to Z275).
2. Mechanical properties (tensile strength, yield strength, elongation, and fatigue resistance).
3. Dimensional stability (flatness and plate shape).
4. Impact resistance and toughness for handling and installation.
5. Surface quality (smooth, clean, and free from defects).
6. Fire resistance (with potential need for fire-resistant coatings).
7. Sustainability (compliance with environmental standards and recyclability).
8. Thermal and acoustic compatibility with insulation materials.
9. Compliance with international building standards and codes.

By meeting these stringent performance requirements, galvanized steel ensures that light steel frame houses are durable, structurally sound, and long-lasting, while also providing protection against environmental factors such as corrosion and wear.