ASTM A516 Gr.70 normalizing
M2M
Dear All
I need to know how can understand that ASTM A516 Gr.70 is normalized or not?
Somebody told me:
“according to clause 5.3 of ASTM A516 standard (attached), when we apply charpy impact test on a material and it pass the impact test successfully, we can say the material is surly normalized but if the material can’t pass the impact test, we shall apply metallographic test to understanding if the material is normalized.
And somebody said me:
“we have just 1 way to know that is the material normalized or not. And its metallographic test.”
M. Farhang
Eng.Mahmoud kamel
5. Heat Treatment
5.1 Plates 1.50 in. [40 mm] and under in thickness are
normally supplied in the as-rolled condition. The plates may be
ordered normalized or stress relieved, or both.
5.2 Plates over 1.50 in. [40 mm] in thickness shall be
normalized.regards
mahmoud
To: material...@googlegroups.com
Subject: [MW:16574] ASTM A516 Gr.70 normalizing
Date: Wed, 23 Jan 2013 06:17:22 +0330
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John Henning
See 5.1 and 5.2 of the A516 specification.
Anything less than 1.5 inches thick is usually as rolled and anything above 1.5 inches thick is required to be normalized.
If you need low temperature impacts and the material thickness is less than 1.5 inches, you should specify that the material be normalized.
Heat treatment should be stated on CMTR.
John A. Henning
Welding & Materials
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of M2M
Sent: Tuesday, January 22, 2013 8:47 PM
To: material...@googlegroups.com
Subject: [MW:16574] ASTM A516 Gr.70 normalizing
Dear All
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sarfaraz tambe
If you wanted to know whether the material is normalized or not go for
microstructure.if ASTM no obtained is greater than 5 then the material
is said to be normalized.as above ASTM no 5.fine grain structure is
observed.
Regards
Sarfaraz Tambe
QA/QC Engineer
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Regards
TAMBE Sarfaraz.
mob. 9960860167
MUNHOZ Sergio TECHINT
The plates can be supplied “normalized” or “as rolled”; it depends how it was ordered:
In my point of view, for data book issues and assured properties , you should have the original material certificates that guarantee the treatment imposed to the material’s specific lot. Metallographic tests can guarantee only the conditions for the specific plates inspected.
Special attention to the AWS D1.1 regarding precaution when using ASTM A 500 class where toughness properties are required.
Gest regards
Sérgio Munhós
--
M.A.Samdani
(air-cooled) should have more hardness than the as-rolled or stress
relieved. as hardness is related to tensile strength u can assess its
strength and compare it with literature value.
regards,
meisam shokri arfaei
Dear Farhang,
Based on my experience in laboratory, in some cases metallographic microstructures could not show the material whether normalized or not because this type of heat treatment will not affect microstructure as much as other heat treatments e.g. annealing. However in some cases we could see normalized microstructure clearly. The big problem is we have no judgment base for differing between normalized or non-normalized microstructures for different kind of materials.
I think because of that, standards based their qualifications on impact test (we have keep in mind that normalizing will improve toughness properties, I mean the subject is toughness not the normalizing by itself). So if you test a material and qualify for impact, you can assume it as normalized material or a material treated at least equal to normalizing.
Regards
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