View Question
Q: Torsional strength of carbon steel square tubing ( No Answer,   1 Comment )
 Question
 Subject: Torsional strength of carbon steel square tubing Category: Miscellaneous Asked by: twisterman-ga List Price: \$25.00 Posted: 01 Sep 2006 19:20 PDT Expires: 01 Oct 2006 19:20 PDT Question ID: 761542
 ```I need to know the torsional strength (in lbs/ft) of 1" and 1.25" square tubing in ASTM A500 Grade B and ASTM A513 carbon steel. Wall thickness is .065"``` Request for Question Clarification by redhoss-ga on 02 Sep 2006 06:41 PDT ```I can answer your question for ASTM A500 Grade B using published numbers for yield strength (46,000 psi). However, ASTM A513 refers only to method of manufacture: Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing. If you have specific yield strength, we can use that number. I am assuming that you want to use yield and not ultimate (tensile) strength. Also, torsional moment is expressed in ft-lbs not lbs/ft.``` Clarification of Question by twisterman-ga on 03 Sep 2006 06:09 PDT ```In regards to the ASTM A513 question, the material grade would be 1010. Also, to my knowledge, lbs/ft and ft/lbs are commonly interchanged.```
 There is no answer at this time.

 Subject: Re: Torsional strength of carbon steel square tubing From: barneca-ga on 03 Sep 2006 11:50 PDT
 ```lbs/ft means pounds per foot, obviously not the same thing as feet per pound. if you're talking torsion, you mean pounds times feet, commonly written ft-lbs or lbs-ft. probably would be better to use ft*lbs, but nobody does. there are some people who try, ad nauseum, to force you to differentiate between ft-lbs and lbs-ft (one being torsion and one being energy; i forget which is supposed to be which), but these people are nitpicking and best ignored by normal humans. -cab```