casting manufacturing flow & process information coefficient of friction corrosion high tensile fastener bolt elongation thread wash out bolt preload thread ripp off vdi2230 thread engagement stv ltv wind turbine -40 impact casting casting six sigma six sigma project project management fatigue failure fasteners decarburization carburization iso898-1-2013 surface hardness core hardness cold forging head type valve tappet shell weight shell mold protection c5m hdg tzn
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