Steel is a metallic substance and an alloy and is used on the planet Earth, primarily for construction purposes. After Stargate Command made investigations of the Virus Orb that SG-1 had brought to Earth from P5C-353, they discovered that the spines deployed by the orb were stronger than steel. (SG1: "Message in a Bottle")

The element Trinium is a hundred times lighter and stronger than steel when refined. (SG1: "Spirits")

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