Quote:
Originally Posted by Kelvin
High strength steels have been around for decades and are economical when the use of a higher yield steel saves material. Thus, if the member is governed by strength - a HS steel will allow you to use a smaller section (and save weight) to do the same job. If however, the member is being governed by stability or serviceability, additional yield strength is not much use because E and kL are unaffected by Fy.
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I was bummed to learn that while higher strength steels can withstand a higher load(stress) than lower strength steel, they will deflect the same amount as the lower strength steel under a given load because all steel has the same modulus of elasticity(E), thus making higher strength steels not so useful for dimension critical applications, like Kevin said.