Spider dragline silk has a tensile strength of roughly 1.3 GPa. The tensile strength listed for steel might be slightly higher – e.g. 1.65 GPa. [1][永久失效連結]Shao, Z. Vollrath, F. Materials: Surprising strength of silkworm silk. Nature. August 15, 2002, 418: 741. doi:10.1038/418741a., but spider silk is a much less dense material, so that a given weight of spider silk is five times as strong as the same weight of steel.
Vollrath, F. Knight, D.P. Liquid crystalline spinning of spider silk. Nature. 2001, 410: 541. doi:10.1038/35069000.
Spider dragline silk has a tensile strength of roughly 1.3 GPa. The tensile strength listed for steel might be slightly higher – e.g. 1.65 GPa. [1][永久失效連結]Shao, Z. Vollrath, F. Materials: Surprising strength of silkworm silk. Nature. August 15, 2002, 418: 741. doi:10.1038/418741a., but spider silk is a much less dense material, so that a given weight of spider silk is five times as strong as the same weight of steel.