It may be good enough, but it won't be as good. Tube is stronger. Rectangular tube is stronger than round tube in bending; round tube is stronger in torsion (twisting). Both are stronger than channel.
My material listing does not contain 1" x 4" x 3/16" hollow structural section tube (HSS).
Perhaps it is 2" x 4" x 3/16" tube?
Further, I assume you are loading it in the weak direction (ie. the 4" dimension horizontal).
If it is 2 x 4 tube it is quite a bit stronger than channel. You can look this up yourself by comparing the section modulus (usually denoted as "Z" or "S" in engineering tables) of the beams you are interested in. Just make sure you use the figure for the correct neutral axis.
Example: 2 x 4 x 3/16 has a section modulus of 1.28 cubic inches when bent "the weak way". A standard channel C4 x 7.25 (1.72" flange width) bent in the weak direction has a section modulus of .34 cubic inches. Therefore the 2 x 4 tube is almost 4 times stronger than the channel if both are of the same quality steel with similar yield strengths.
Trust this helps.
Wolfgang
st> I'm making some light duty lifting forks, under 500lbs.
In the strong direction the 2" x 4" x 3/16" HSS has a section modulus of 1.91 cubic inches.
It is therefore almost 50% stronger when used in this direction.
Wolfgang
P.S.: My reference tome for information of this type is entitled HANDBOOK OF STEEL CONSTRUCTION published by the Canadian Institute of Steel Construction. There are similar publications in the US. Most worthwhile to own even an older edition of this work. wfh.
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