Lifting Chain Grades Explained: Grade 80, Grade 100 and Grade 120

Comprehensive engineering guide to alloy lifting chains: comparing Grade 80, Grade 100, and Grade 120, evaluating working load limits, temperature limits, and hydrogen embrittlement.

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In overhead lifting, heavy rigging, and material handling, alloy steel lifting chains serve as the indispensable backbone for securing and elevating massive industrial loads. Unlike commercial carbon steel hardware or transport tie-down chains, overhead lifting chains are manufactured under stringent metallurgical protocols to guarantee specific tensile strengths, impact resistance, and elongation characteristics. Understanding the engineering differences between **Grade 80 (T), Grade 100 (V), and Grade 120 (VIP)** alloy chains is essential for safety officers, riggers, and procurement managers operating across industrial facilities and maritime ports in Central Africa. Chain grade classifications represent the nominal tensile stress at minimum breaking force, measured in Newtons per square millimeter (N/mm²). A higher grade signifies advanced metallurgical alloying and precision heat treatment, allowing the chain to achieve a substantially higher Working Load Limit (WLL) with a smaller, lighter nominal chain diameter. Navigating the operational trade-offs—including thermal tolerance, notch sensitivity, wear resistance, and cost—ensures equipment longevity and absolute worksite safety. ## Metallurgical Evolution: From Mild Steel to High-Alloy Steels Standard commercial chains (such as Grade 30 proof coil or Grade 43 high-test chain) are strictly prohibited from overhead lifting applications under OSHA, ASME B30.9, and EN 818 standards. Overhead lifting demands specialized ...