Whats stronger bamboo or steel?

Bamboo has greater tensile strength (or resistance to being pulled apart) than steel, and it withstands compression better than concrete. However, untreated bamboo will swell from water absorption, significantly lowering its effectiveness.

Bamboo's tensile strength is roughly 28,000 per square inch versus steel's 23,000.
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Bamboo is better. However if you are looking for storage then steel lockers are best. Our college have such steel lockers and they are best. Midland Steel Equipment Ltd. offer such kind of steel lockers.