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akhilcme
Participant

Join Date: Dec 2011
Posts: 2

NORMALISED SA 516 Gr 70

12/28/2011 9:49 PM

Dear All,

I've purchase a SA 516 Gr 70 plate material for U stamped vessel fabrication, but there is no "MT" or "N" marking on it. But certificate says it is normalised and killed.

How can i confirm that material is normalized, if I do micrographic examination what is the required grain size for normalized plate??

What is the hardness requirement for Normalised plate??

Your valuable advices are highly appreciated.

Regards

Akhil C

QC/Project Engineer

SHJ, U.A.E

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Pathfinder Tags: materials normalise pressure vessel quality control sa 516
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Whitephone
Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 630
Good Answers: 34
#1

Re: NORMALISED SA 516 Gr 70

12/30/2011 4:13 AM

Please read "Specification for pressure vessel plates, carbon steel, for moderate and lower temperature service" ASTM SA-516/516M. Also, SA-20/A20M.

There you have the answer. WP
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akhilcme
Participant

Join Date: Dec 2011
Posts: 2
#2
In reply to #1

Re: NORMALISED SA 516 Gr 70

12/30/2011 4:41 AM

I did Microstructure examination on the plate and I got grain size number 9 on it, which confirms that it is in fine austenitic grain structure. But my question is that can I confirm the normalized condition based on grain structure and hardness??

Since ASME SA 20 and SA 516 is silent about hardness requirement, I could not reach a conclusion based on it.

Regards

Akhil
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Whitephone
Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 630
Good Answers: 34
#3
In reply to #2

Re: NORMALISED SA 516 Gr 70

01/02/2012 9:17 AM

Yes, hardness for this material is no specificate. There some clips in NACE about corrosion, but not to much. For this material (P1) we use Max. 200HB
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santhosh52
Associate

Join Date: May 2007
Location: Baytown, Texas, USA
Posts: 29
#4

Re: NORMALISED SA 516 Gr 70

01/14/2012 8:05 AM

What is plate thickness . As per you the Grainsize is 9, which is considered fine grain for this Grade.What is the chemistry and tensile range. If its Grain size is equiaxed (ferrite & pearlite) and nearly uniform across thickness, it should be considered as normalised .

Once the Certificate says it is Normalised and killed ( Al-Si Killed ? ) and if it is meeting the properties, should also be O K for taking up fabrication .

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