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Oscarvs (Mechanical)
13 Jul 09 19:43
We are working a project for structural application, we required ASTM A36 plates of 3 mm thickness, one supplier offered ASTM A1011 Type 1 Grade 36, they indicate that ASTM A36 is for plates of 5 mm and over, and A1011 is applicable for 6 mm and under, and that 3 mm thickness is considered sheet.
I review ASTM A6, ASTM A36, ASTM A1011 and ASTM A568, and I don't clear up this matter, but really the chemical composition and mechanical properties are similar on both specifications.
Please if somebody could give me some reference for clear up this matter.
Helpful Member!(4)  ajh1 (Structural)
14 Jul 09 7:35
Your supplier is correct.
ASTM A36 is viewed generally as a plate steel, with reference for general specifications requirements to ASTM A6.  A6 states hot-rolled plate is generally defined as material 0.230" (6 mm) or thicker for widths 8" - 48" and material 0.180" (4 mm) or thicker for over 48 " in width.
ASTM A1011 is defined as a sheet steel.  For hot-rolled sheet, the general specification ASTM A568 indicates an upper limit of 0.230" (6 mm) for basically all widths.  The range 4mm to 6mm is a bit of a gray area at the moment.
ASTM A1011 Grade 36 Type 2 was intended to match ASTM A36 plate steel as close as possible in a sheet thickness.
Helpful Member!  metengr (Materials)
14 Jul 09 7:57
I concur, the supplier is correct with providing ASTM A 1011 SS (structural steel) Grade 36.
Oscarvs (Mechanical)
14 Jul 09 9:31
Thanks ajh1,

I understand your explanation, but... do you know some technical paper or literature where it is confirmed?, i.e. some ASTM standard?
About the correct equivalence: ASTM A36 vs ASTM A1011,... is Grade 36 Type 1 or Type 2?.
Regards.
ajh1 (Structural)
15 Jul 09 8:11
Not sure what you mean by confirmed.  The information I gave is straight from the various ASTM standards themselves.  I'm on the ASTM committees that handle both of these standards, and my recollection was that A1011 Grade 36 Type 2 was added specifically for the A36 compatibility.  The clue is that the tensile limits are set to match A36.

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