Base Metal Hardness after PWHT

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patelr...@gmail.com

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Feb 21, 2020, 1:48:21 AM2/21/20
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Dear Experts,

For SA 182 F11 and SA 182 F22 materials after welding and PWHT hardness of Base Metal is reduced to 120 HB, is it acceptable or not ?

james gerald

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Feb 21, 2020, 2:22:41 AM2/21/20
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If you use a rebound hardness tester or some similar sources it may show low reading. Properly grind the surface and use a calibrated hardness machine. Your readings are low and it should be between 200 to 225 bhn


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harenath jha

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Feb 21, 2020, 2:43:04 AM2/21/20
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Please specify the Method of measurement and instruments used ?

On Fri, Feb 21, 2020 at 12:18 PM <patelr...@gmail.com> wrote:
Dear Experts,

For SA 182 F11 and SA 182 F22 materials after welding and PWHT hardness of Base Metal is reduced to 120 HB, is it acceptable or not ?

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james gerald

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Feb 21, 2020, 4:59:27 AM2/21/20
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Referred hardness testing equipment is GE Krautkramer MIC 10

Thanks & Regards

J.Gerald Jayakumar




Roshan Patel

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Feb 21, 2020, 5:38:01 AM2/21/20
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Hardness measured with portable Hardness tester. Also try after grinding also no major different.

My point is after PWHT Base Metal hardness is around 120 HB acceptable or not ?

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james gerald

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Feb 22, 2020, 12:12:23 AM2/22/20
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There is no limitation on lower hardness value. But tensile strength is proportionate to hardness. Hence check with your client


Karthik

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Feb 22, 2020, 12:41:30 AM2/22/20
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Hi,
Please find below the hardness limit for SA182 F11,F22. You didnt specify the Class for F11 and F22. Hardness value limits varies depend upon the class. for F22 Class 1, no minimum value but other classes in F22 and F11 have minimum and maximum values.

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Thanks& Regards,

 

(Karthik)

Karthikeyan.S

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On Friday, February 21, 2020, 01:48:21 PM GMT+7, patelr...@gmail.com <patelr...@gmail.com> wrote:


Dear Experts,

For SA 182 F11 and SA 182 F22 materials after welding and PWHT hardness of Base Metal is reduced to 120 HB, is it acceptable or not ?

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pradip kumar Sil

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Feb 22, 2020, 6:22:37 AM2/22/20
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Hi,
Code does not mention higher and lower hardness limit. Your designer will specify the lomit.
Regards,
Pradip

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Roshan Patel

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Feb 22, 2020, 11:47:22 AM2/22/20
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Dear,

I am not asking about raw material hardness requirement. If I weld two pieces of F22 Cl 3 material and put whole item in Furnace for PWHT then how I will achieve base metal hardness as per raw material requirements ?

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