No, are you? If what you said was true then titanium components could be 1/4 of the weight of steel equivalents. Yield stress is measured in pressure, which is force/area. NOT force/density. In which case you wouldn't have been talking complete bollocks In English terms, titanium is nearly (~10% like I said) as strong as steel, but around half the weight. You were suggesting that titanium is twice as strong whilst being half the weight, this is, unfortunately for us engineers, not true.