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@deleted
from the above link
reynolds 525 114ksi
"525 offers a tube-set with strengths similar to the famous 531 range."
columbus spirit 177-205 KSI
(ksi a measurement of tensile strength)
shows how far modern steels have progressed. but it's not about numbers it's about how a materials properties can be used advantageously to make a light, strong, stiff frame.
531 tubes are dimensionally challenged and for lugged construction only which essentially means it's not light stiff or strong but these are the compromises you need to make to achieve 531 awesomeness.