ASME B30.9 requires a minimum grade alloy steel chain for hoisting chain of which grade?

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Multiple Choice

ASME B30.9 requires a minimum grade alloy steel chain for hoisting chain of which grade?

Explanation:
ASME B30.9 requires hoisting chains to be an alloy steel chain of at least Grade 80. This is because overhead lifting places high, concentrated loads and potential shock on the chain, so it must have enough strength, ductility, and wear resistance to maintain a safe working load limit over time. Grade 80 provides the necessary tensile strength and fatigue resistance to handle lifting duties reliably. Lower grades like those used for general use or binding (Grade 60 or Grade 70) don’t meet the required strength for lifting, while higher grades such as Grade 90 would also be acceptable but are not the minimum standard.

ASME B30.9 requires hoisting chains to be an alloy steel chain of at least Grade 80. This is because overhead lifting places high, concentrated loads and potential shock on the chain, so it must have enough strength, ductility, and wear resistance to maintain a safe working load limit over time. Grade 80 provides the necessary tensile strength and fatigue resistance to handle lifting duties reliably. Lower grades like those used for general use or binding (Grade 60 or Grade 70) don’t meet the required strength for lifting, while higher grades such as Grade 90 would also be acceptable but are not the minimum standard.

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