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Up Topic Welding Industry / Technical Discussions / ASTM Designation for High strenth Channel ???
- - By david bean (**) Date 04-16-2009 18:32
Greeting all,  Can anyone give me a history of why ASTM conciders a Wide flage A992 and Plate A572?  Is it just to tell you that it is a wide flange or whats the difference in material? What about high strength channel ? would this be concidered a A992?
please respond ;)
Parent - - By swnorris (****) Date 04-16-2009 19:21
A992 is actually a refined A572 Grade 50 and is specifically for wide flange.  It's similar to A572 Gr. 50, but has better controls on chemistry and mechanical properties. It includes minimum values for yield and tensile strengths, a maximum ratio for yield strength to tensile strength, and a maximum carbon equivalent value.  The major advantage of A992 is it's better material definition. It has an upper limit on yield strength of 65 ksi, a minimum tensile strength of 65 ksi, a specified maximum yield to tensile ratio of 0.85 and a specified maximum carbon equivalent of 0.47%.  Channels can be specified as A36 or A572.
Parent - - By swnorris (****) Date 04-16-2009 19:29
A great 2004 article on materials specification written by Charlie Carter.

http://www.modernsteel.com/Uploads/Issues/January_2004/30725_materials.pdf
Parent - - By david bean (**) Date 04-16-2009 20:22
Ok. thanks for the info and the link. So would it be safe to say that A992 is for wide flange only?
Parent - By swnorris (****) Date 04-16-2009 21:53
Yes, but I wouldn't rule out a dual cert (A36/A572) or a tri-cert (A36/A572/A992) on channels .  I think that before it's over, channels will end up being produced to meet A992 specs.  Wide flanges used to be A36.  If you wanted A572 Gr. 50 you had to special order it.  Then it went to dual cert A36/A572, then it went to tri-cert A36/A572/A992.  Now it's A992.  I think that channel production will follow suit.  
Parent - By hogan (****) Date 04-16-2009 22:03
The spec (A992) is titled Standard specification for structural steel shapes.
AISC references W,HP, C, MC, WT, MT, ST, 2C, 2MC shapes (angle is not referenced as a shape)
A6 references W, HP, S, M, C, MC, and L shapes (L being angle)

definition:
Struc´tur`al shape
1. (Engin. & Arch.) The shape of a member especially adapted to structural purposes, esp. in giving the greatest strength with the least material.

DOT definition:
structural shapes - the various types of rolled iron and steel having flat, round, angle, channel, "I", "H", "Z" and other cross-sectional shapes adapted to the construction of the metal members incorporated in reinforced foundations, substructures and superstructures

Probably not a lot of help
Up Topic Welding Industry / Technical Discussions / ASTM Designation for High strenth Channel ???

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