AISC Steel Shape Densities, and M4x3.45 vs M4x3.2
AISC Steel Shape Densities, and M4x3.45 vs M4x3.2
(OP)
This is purely out of curiosity.
I was checking the densities of all the steel shapes in the AISC database to see how close they are to 490 PCF by taking the Weight / Area * 144. Just for fun.
I noticed that closed shapes such as HSS and Pipe have densities around 525 pcf, while all other shapes have around 490 pcf.
Did anyone realize this? Is the density of A500 and A53 steel 525 pcf instead of 490?

Also things to note are:
Lighter shapes have more variance (likely rounding errors).
Pipe12XS has the highest density at 539 pcf.
M4x3.2 has the lowest density at 456 pcf.
This made me realize that the M4x3.2 is the exact same shape as the M4x3.45 EXCEPT it weighs 0.25 plf less. Every other single property is the same. Does anyone know why?
I was checking the densities of all the steel shapes in the AISC database to see how close they are to 490 PCF by taking the Weight / Area * 144. Just for fun.
I noticed that closed shapes such as HSS and Pipe have densities around 525 pcf, while all other shapes have around 490 pcf.
Did anyone realize this? Is the density of A500 and A53 steel 525 pcf instead of 490?

Also things to note are:
Lighter shapes have more variance (likely rounding errors).
Pipe12XS has the highest density at 539 pcf.
M4x3.2 has the lowest density at 456 pcf.
This made me realize that the M4x3.2 is the exact same shape as the M4x3.45 EXCEPT it weighs 0.25 plf less. Every other single property is the same. Does anyone know why?






RE: AISC Steel Shape Densities, and M4x3.45 vs M4x3.2
This makes steel "appear" to be 7% heavier than it is. Therefore 490 lb/ft3 x 1.07 = 524 lb/ft3
The 524 lb/ft3 value is near the median of the HSS cluster on your graph. I suppose the spread around that median is from expected variations (similar to the allowable steel shapes variations.)
ASTM A1085-13 is changing all this. See this Modern Steel Construction article: Link
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RE: AISC Steel Shape Densities, and M4x3.45 vs M4x3.2
RE: AISC Steel Shape Densities, and M4x3.45 vs M4x3.2
What about the M4x3.2 being the same shape as the M4x3.45, yet weighing 0.25 plf less?
Any ideas?