/ / Composition for manufacturing bolts/nuts for KP mechanical joint and bolts /nuts thereof

摘要

The present invention relates to a composition for manufacturing bolts / nuts for KP mechanical joints and bolts / nuts thereof, wherein the carbon content is 0.20% by weight or less, manganese 1.25% by weight, sulfur 0.05% by weight, chromium 0.8% by weight, Nickel 0.25% by weight or more, 0.20% by weight of copper, the remainder is composed of iron, and the composition is used as a bolt / nut for KP mechanical joints to maintain excellent corrosion resistance. It has a superior effect to facilitate machinability and other mechanical properties than nuts.