Why is SAE 8620 steel selected as the material of YOKE Grade 80 lifting chains sling¡¦s components?
• The material selection of Grade 80 lifting chains and safety components bases on the criteria of EN1677 Standard. The mechanical properties are main standard features, and the chemical compositions are not strictly confined. • The required performances of lifting chains and safety components are high strength, high toughness, high hardenability, high dynamic fatigue strength, low ductile-brittle transition temperature, low notch-impact sensitivity, excellent abilities of machining, welding, and workability. Besides, the lifting chains and safety components must pass all the proof tests prescribed in the Standard. • High tensile strength steels (HSLA) are suitable candidates for the Grade 80 lifting chains and safety components, but the general non-thermo-treated structural alloy steels can not satisfy the strength criteria, 800N/mm2. • The as-rolled and normalized HSLA with strength of 70~100 Kgf can not simultaneously ensure the excellent notch-toughness and welding ability. Therefo
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