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 Post subject: Normalization
PostPosted: Tue Sep 15, 2009 12:29 pm 
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Goodmorning.
Coluld you tell me which is the difference between SA516 gr.70 and SA516 gr.70N?
Thank you


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 Post subject: Re: Normalization
PostPosted: Sat Sep 19, 2009 8:27 pm 
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francescocass wrote:
Goodmorning.
Coluld you tell me which is the difference between SA516 gr.70 and SA516 gr.70N?
Thank you

N is used to mean Normalized.
Normalizing is heating at 920 °C approx. to full austenitizing the steel and then cooling in still air.
Mauro


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 Post subject: Re: Normalization
PostPosted: Thu Feb 24, 2011 8:42 am 
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If the plate material specified to SA516,70 (without normalized), but the actual used plate is normalized then will it still comply to code?


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 Post subject: Re: Normalization
PostPosted: Fri Feb 25, 2011 2:52 am 
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dear friend,

i cant understand what u r saying pl. define.

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Regards,

M.KASI


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 Post subject: Re: Normalization
PostPosted: Fri Feb 25, 2011 5:52 am 
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Joined: Tue Dec 01, 2009 1:55 pm
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Location: DESCON Engineering Limited, Pakistan
If the plate material specified to SA516,70 (without normalized), but the actual used plate is normalized then will it still comply to code?

yes.
It is a mandatory requirement of the Code (Section II Part A) that the plate SA-516 shall be normallized if thickness is over 40 mm otherwise it is an additional requirement for less than or equal to 40 mm.

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Thanks & Regards,
Nasir
Welding Engineer
DESCON Engineering Limited.
Lahore, Pakistan.
Mobile # 0092-336-4145402


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 Post subject: Re: Normalization
PostPosted: Sun Mar 06, 2011 9:02 am 
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A) Normalising is not mandatory till 40 mm . It is a supplementary condition to be specified by Purchaser . When Normalising is not specified for lower thicknesses , both SA 516 Gr70 & SA 516 Gr70N meet the specifications.

B) Having said that , there is a difference in Impact test requirements. Ref UCS-66 . Normalised Grade 70 falls in Curve D where as Not - Normalised Grade falls in Curve B . For Impact test exemption ,see also
UG-20(f) -(up to 25 mm) & UCS-68(c) -up to 38 mm .

C) Fabricator can normalise the plate - UG-85 & UCS-85 apply.

D) Code does not specify single temperature for Normalising .
It is defined as "Heating above Upper Transformation Temperature and cooling in still air " Normalising temperature varies with carbon content and is left for fabricator to decide.

With regards
Rathnam


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