corrosion high tensile fastener coefficient of friction casting manufacturing flow & process information tzn hdg c5m protection shell mold shell weight head type valve tappet cold forging core hardness surface hardness iso898-1-2013 carburization decarburization fasteners fatigue failure 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
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