REG. Hardness max 200 BHN for P NO.1 PQR

[PARAI Reaction Channel]

Dear Sirs,

One of our client in Korea requires PQR for SA 516-70 , P NO. 1 without PWHT condition , to fabricate  shell of 17T U stamp,  as per design code ASME SEC VIII DIV- 1 , 

with max 200 BHN in weld and HAZ as per their spec. 

So we made a PQR with GTAW ER70S-6 & SMAW E7016 classes for welding SA 516-70 , 17T,

GTAW - 5mm weld deposited from root and rest of the passes with SMAW for 12 mm.

You can find the attached pictures for welding parameters and the PQR test results.

Hardness exceeded the 200 BHN limits. 

So, can I change to  ER70S-2 ,  the low manganese GTAW ROD and SMAW E7016 with 3.2 dia to obtain max 200 BHN , without PWHT.

Please advice me urgently, after checking the attached weld parameters,  preheat, interpass temp.  etc. To successfully get the hardness of max 200 BHN .

Thank you. 

With best regards, 

Saravanan Sornam, 

S. KOREA 

[Raghuram Bathula]

you can control thro' the chemistry of filler and base metals (C, and CE), increase preheat 

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[james gerald]

Please note Brinell Hardness testing is used only for Base Material at Mill and for Production hardness testing. The requirement of 200 BHN is mostly specified for Production Hardness testing since you use a 10 mm Ball indentor.

For PQR, you have to use Vicker's Hardness test for which the NACE MR 0103 / 0175 values are 248HV10 which is considered stringent for P1 materials. Please check your specifications.

Thanks & Regards

J.Gerald Jayakumar

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[PARAI Reaction Channel]

Dear Sir, 

Thank you for your reply.

To weld SA 516 70 , 17 T , can we restrict CE to 0.35 % ?

May I know the carbon value for obtaining the low hardness for plate and GTAW , ER70S-6 OR ER70S-2. 

Shall I preheat to min 100 deg C and maintain until final pass for 17T ?

Whether ER70S-2 can give Lower hardness for about 5 mm weld deposited from root ?

Please advice.

Regards,

Saravanan Sornam, 

KOREA

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[Vishwas Keskar]

Dear Saravanan

PQR  testing  is in HV10 due to size of the identer and load (BHN -Ball indenter 10 mm , 3000 kg load ) .Basically for bigger jobs like plate Forgings or high thickness PQR IN P No 1 materials, BHN is followed.

HV10   Hardness shall be 248HV10  when 2200 BHN is specified when PQR hardness is needed.

In your PQR , The readings are complying to less than 248 HV10 (Pl read SP 0472 )

Now let us discuss @ production welding Hardness :

Here you have to use Poldi BHN tester and compare the Ball indent on job with test bar 

That hardness is in BHN and shall be less than 200 BHN.

Pl have a word with Client and elaborate above details with them .

Thanks and regards

Vishwas

IWE

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On 03-May-2023, at 9:46 AM, 'james gerald' via Materials & Welding <material...@googlegroups.com> wrote:



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[PARAI Reaction Channel]

Dear Sir, 

Thank you.

Yes, you are right.

Even the lab test officer told, they will use vickers only and will convert to BHN as per ASTM E140 .

Please see the attached result.

Regards,

Saravanan Sornam, 

KOREA

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[Raghuram Bathula]

70S2 could be better , you may refer to SP0472 for guidance on fillermetal chemistry and preheat.

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[PARAI Reaction Channel]

Dear Mr. VISHWAS,

so in your statement, 

From our PQR result, which has been tested with Vicker HV10, these values are equivalent to BHN  2200 load right,  

That is well below the 248 HV 10 as per SP7042 ?

Still we are not sure, why our client needs 200 BHN without pwht for P NO. 1 and there are no special tests, HIC , SSCC, sour service as per NACE requirements in their SPEC.

Regards,

Saravanan Sornam, 

KOREA

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[james gerald]

Dear,

As advised by Viswas and Raghuram, some snapshots of NACE SP0472 to understand about PQR Hardness & Production Hardness.

SP-0472 is only applicable For Refinery and only for understanding.

Thanks & Regards

J.Gerald Jayakumar

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