High Strength Welded G80 Lifting Load Chain

1. Core Material & Welding Craftsmanship

• High-Quality Alloy Steel: Constructed from heat-treated alloy structural steel (e.g., 20Mn2 or 23MnCrNiMo54), the chain undergoes precise quenching and tempering processes. This treatment enhances its tensile strength, yield strength, and resistance to wear and impact, enabling it to withstand harsh working conditions (e.g., heavy loads, temperature fluctuations).
• Precision Flash Butt Welding: Each chain link features a seamless, high-integrity flash butt weld—far superior to traditional manual welding. The welding process is computer-controlled to ensure uniform fusion of link ends, eliminating weak points (e.g., cracks, porosity) and guaranteeing consistent load-bearing capacity across every link.
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2. G80 Grade Performance & Safety

• Strength Metrics: Typical working load limits (WLL) range from 0.5t to 100t (depending on chain diameter, e.g., 6mm chain = 0.8t WLL; 26mm chain = 25t WLL). The minimum breaking load (MBL) is 4 times the WLL (4:1 safety factor), exceeding lower grades (e.g., G60 = 3:1 safety factor) to handle unexpected shock loads.
• Fatigue Resistance: The heat-treated surface and smooth link contours reduce stress concentration, enabling the chain to withstand repeated lifting cycles (up to 10,000+ cycles) without fatigue cracking—ideal for continuous-use applications (e.g., factory assembly lines, port container handling).
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3. Durability & Environmental Adaptability

• Corrosion Protection: Available with multiple surface treatments to suit harsh environments:
  • Black Oxide Coating: For general industrial use, providing basic rust resistance and low friction.
  • Hot-Dip Galvanization: For outdoor or humid environments (e.g., construction sites, marine applications), offering long-term protection against saltwater and moisture.
  • Nickel-Plating: For cleanroom or food-processing industries, ensuring corrosion resistance and compliance with hygiene standards.
• Abrasion Resistance: The hardened steel surface (Rockwell hardness HRC 30-35) resists wear from contact with hooks, shackles, or rough loads, extending the chain’s service life by 30% compared to non-hardened alternatives.
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4. Application Scope

• Heavy industry (steel mills, automotive manufacturing, machinery moving).
• Logistics & ports (container lifting, warehouse pallet handling).
• Construction (crane lifting of concrete structures, steel beams).
• Mining & energy (hoisting equipment parts, mineral containers).
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5. Quality Assurance & Compliance

• Individual Load Testing: Each chain is pressure-tested to 1.5 times its WLL to verify structural integrity.
• Visual & Dimensional Inspection: Links are checked for uniform size, weld quality, and surface defects (e.g., burrs, deformation) using precision gauges.
• Certifications: Complies with ISO 3077, EN 818-2 (European standard), and ANSI ASME B30.9 (U.S. standard), with each chain accompanied by a test certificate for traceability (batch number, WLL, MBL, inspection date).
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6. Usage & Maintenance Recommendations

• Never exceed the rated WLL or use damaged chains (e.g., bent links, cracked welds).
• Inspect the chain before each use for signs of wear, corrosion, or deformation.
• Lubricate regularly with high-pressure lithium grease to reduce friction and prevent rust.
• Store in a dry, ventilated area to avoid moisture damage.