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Different standards for the same steel

Different standards for the same steel

Different standards for the same steel

(OP)
i want to find the yield stress of the steel i am using (a parallel flange channel from corus).  all i have from the corus catalogue is that it conforms to bs4: part 1 and bs en 10056:1999.

anytime i do a search on this sort of thing all i get are either lists of standards (but not the actual standards themselves) or else all sorts of different types of grades (i assume grade 300 is a different type of grade to grade 43 and 50).

i have discovered that grades 43 and 50 are both covered by this standard, but they have different yield stresses.  should i just assume its grade 43 to be on the safe side?  or is ther another grade lower than that also covered?

why o why dont they just put the yield stress of their steel in the book?  whats the point of knowing the moment of area if you dont have a clue what the yield stress is?

RE: Different standards for the same steel

BS4 deals with section sizes, EN 10056 deals with tolerances.

Material standards are now EN 10025 or EN 10113

the old grade 43 is now grade 275 (275N/mm2 YS)
the old grade 50 is now grade 355 (355N/mm2YS)
there is/was grade 40 now grade 235 (235N/mm2 YS)
so the safest would be to assume the lower strength

Is there any marking on the channel which would help you identify the grade?

RE: Different standards for the same steel

(OP)
Thanks, thats great.

The guy who ordered the channel found the invoice for me, and got the grade.

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