SGH440 SGH440-CG Galvanized Steel Sheet Metal Fabrication Laser Cutting Service
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Tianjin Emerson Metal Steel Products Co., Ltd. is proud to offer the SGH440 & SGH440-CG Galvanized Steel Sheet Metal Fabrication Laser Cutting Service under the EMERSONMETAL brand. As a professional sheet metal fabrication factory, we specialize in transforming these high-strength galvanized steel sheets into precision parts through advanced laser cutting, bending, and welding processes. Designed to meet the demands of high-performance industrial applications, our service leverages the unique mechanical properties of SGH440 and SGH440-CG—superior strength, corrosion resistance, and heat treatability—to deliver reliable solutions for industries ranging from construction to petrochemicals.
SGH440 and SGH440-CG are high-strength galvanized steel grades engineered to outperform ordinary structural steels. Both are 50% stronger than standard Q235 steel, making them ideal for applications requiring enhanced mechanical strength. A key feature shared by both is their hot-dip galvanized coating, which forms a protective zinc layer that resists rust and corrosion. This coating ensures long-term durability in harsh environments, including exposure to moisture, industrial chemicals, and high-temperature fluids—critical for extending service life in demanding settings.
While SGH440 and SGH440-CG share similar chemical compositions (both have a maximum carbon content of 0.25% and manganese content of 2%), they differ in mechanical properties to suit distinct applications. SGH440 offers a higher tensile strength (≥550 MPa) and yield strength (≥350 MPa), making it ideal for parts that need to bear heavy loads without deformation. Its elongation rate of 11-12% provides sufficient ductility for structural components. SGH440-CG, by contrast, prioritizes flexibility with a significantly higher elongation rate of 41%, while maintaining a tensile strength of ≥472 MPa and yield strength of ≥253 MPa—making it suitable for parts requiring both formability and moderate strength.
A standout advantage of both grades is their heat treatability. They can undergo various heat treatments, including annealing, quenching, tempering, normalizing, and quenching-and-tempering (Q+T). This allows us to adjust their mechanical properties—such as hardness and toughness—to meet specific application needs. For example, quenching can enhance SGH440’s strength for heavy machinery parts, while annealing can improve SGH440-CG’s formability for complex shapes.
Our fabrication process is optimized to maximize these materials’ potential. Laser cutting is performed using state-of-the-art CNC machines, achieving tolerances as tight as ±0.1mm even for sheets 1mm to 50mm thick. This precision ensures parts match your drawings exactly, with clean edges that reduce the need for secondary finishing. The laser cutting process minimizes heat transfer to the surrounding material, preserving the integrity of the galvanized coating and avoiding corrosion vulnerabilities. For thicker sheets (over 20mm), we adjust cutting parameters to ensure smooth, accurate cuts without compromising structural integrity.
Beyond laser cutting, we offer complementary services such as bending, welding, and heat treatment. Bending is performed with CNC-controlled equipment that applies uniform force, preventing cracks in the galvanized layer. Welding uses low-heat techniques to maintain the zinc coating’s protective properties at joints. Customization is central to our service: we accept OEM orders based on customer drawings, with flexibility in size, thickness, and post-processing treatments. Whether you need a single prototype or large-volume production, we accommodate orders starting from 1 piece, with rigorous quality checks at every stage to ensure consistency.
OEM/ODM based on drawings; customizable size, thickness, and heat treatment
OEM/ODM based on drawings; customizable size, thickness, and heat treatment
Brand
EMERSONMETAL
EMERSONMETAL
Minimum Order Quantity
1 piece
1 piece
Application Scenarios
The distinct properties of SGH440 and SGH440-CG make them suitable for a range of high-performance applications:
SGH440 Applications
Heavy Machinery and Construction: SGH440’s high strength makes it ideal for structural components in excavators, cranes, and building frames. It supports heavy loads in construction projects such as high-rise buildings and bridges, where its corrosion resistance protects against weathering.
Petrochemical Equipment: Used in pressure vessels, pipelines, and storage tanks, SGH440 withstands high temperatures and corrosive fluids. Its heat treatability allows it to be optimized for high-pressure environments, ensuring the safety of petrochemical operations.
Industrial Tooling: SGH440 is used for manufacturing machine bases, gearboxes, and load-bearing brackets. These parts require rigidity to maintain precision during operation, and SGH440’s strength ensures long-term stability.
SGH440-CG Applications
Automotive and Transportation: SGH440-CG’s high ductility makes it suitable for car body panels, truck chassis components, and railway parts. It can be bent into complex shapes without cracking, while its corrosion resistance protects against road salt and moisture.
Mechanical Assemblies: Used in flexible connectors, springs, and hinges, SGH440-CG offers the perfect balance of formability and strength. Its ability to withstand repeated bending (due to 41% elongation) makes it ideal for moving parts in industrial machinery.
Infrastructure and Decorative Parts: SGH440-CG is used in guardrails, street lamp poles, and decorative steel structures. Its formability allows for custom designs, while the galvanized coating ensures durability in outdoor settings.
Frequently Asked Questions (FAQ)
What is the key difference between SGH440 and SGH440-CG, and how do I choose? The primary difference is in their mechanical properties: SGH440 offers higher strength (tensile strength ≥550 MPa) but lower ductility (elongation 11-12%), making it ideal for heavy-load structural parts. SGH440-CG has lower strength but significantly higher ductility (elongation 41%), suitable for parts needing bending or forming. Choose SGH440 for load-bearing applications like machinery frames; opt for SGH440-CG for components requiring shaping, such as automotive panels. Our team can recommend the right grade based on your design.
Can SGH440 and SGH440-CG be used in high-temperature environments? Yes, both grades perform well in high-temperature environments, especially after heat treatment. They can withstand continuous operating temperatures up to 300°C, making them suitable for petrochemical pipelines and industrial furnace components. For temperatures above 300°C, we recommend a quenching-and-tempering treatment to enhance heat resistance. We can also provide material testing reports for high-temperature performance upon request.
How does the galvanized coating hold up during laser cutting and welding? Our laser cutting process uses precise heat control to minimize damage to the galvanized coating. A small heat-affected zone (≤0.5mm) near cut edges may lose some zinc, but this does not compromise overall corrosion resistance. For welding, we use low-heat techniques (e.g., gas metal arc welding) and offer post-weld zinc touch-ups (zinc-rich paint) to restore protection. These measures ensure the coating remains effective in harsh environments.
What is the maximum thickness for laser cutting these materials? We can laser cut SGH440 and SGH440-CG sheets from 1mm to 50mm thick. For thicknesses over 20mm, we use high-power laser machines and optimize cutting parameters to ensure clean, accurate edges. Thicker sheets may require additional cooling during cutting to prevent thermal distortion, a step we incorporate into our process at no extra cost.
What is the lead time for custom fabrication orders? Lead time depends on part complexity, thickness, and quantity. For simple laser-cut parts (1-50 pieces, 1-10mm thick), delivery takes 3-5 working days. For thicker sheets (over 20mm), parts requiring heat treatment, or large orders (100+ pieces), lead times extend to 7-12 working days. Urgent orders can be expedited, with small batches available in 2-3 working days for an additional fee. We confirm timelines after reviewing your drawings.
Why Choose Our SGH440 & SGH440-CG Fabrication Service
Our SGH440 & SGH440-CG Galvanized Steel Fabrication Service stands out for its focus on quality, precision, and adaptability:
Material Expertise: We source certified SGH440 and SGH440-CG steel, ensuring consistent chemical composition and galvanized coating quality. This guarantees reliable performance in high-stress and corrosive environments.
Advanced Fabrication: Our laser cutting machines handle 1-50mm thicknesses with ±0.1mm tolerances, while heat treatment capabilities allow us to tailor material properties to your needs.
Customization Flexibility: From prototypes to mass production, we accommodate orders starting from 1 piece, with support for custom sizes, thicknesses, and post-processing.
Durability Focus: We preserve the galvanized coating during fabrication and offer post-treatment options to enhance corrosion resistance, extending part service life.
Quality Assurance: Rigorous inspections—from material testing to final dimensional checks—ensure parts meet your specifications. We provide certification for traceability and compliance.