Friday, September 9, 2011

RE: [MW:12394] RE: 12370] Hardness in Tube to tube sheet welding

Few reference related to hardness values are as below.

 

As per API 661-Para 10.1.7 (d), Hardness shall not exceed 20 HRC for carbon steel, this value is in general not for specific T/TS weld joint.

 

As per API 582-12.6.1.3, for acceptance, all hardness values for P1 materials (including S1, Group Nos. 1 & 2) in crack inducing environments (defined in NACE RP0472 and identified by the purchaser) shall be 248 HV10 or lower.

 

As far as EN code is concern . Refer ISO 15614-8, Para 7.1.6, hardness test is not required for T/TS PQR of group no. 1 material and as per 7.2.6 hardness test results shall meet the requirement of table 2 of EN ISO 15614-1.

 

Regds/Jignesh

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of vaibhav Joshi
Sent: Friday, September 09, 2011 11:12 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:12385] RE: 12370] Hardness in Tube to tube sheet welding

 

Dear,

 

Preheat is one of the good tool to control an hardness try using 150 C -200 C preheat. that may work for you. Moreover there are some special NACE grade of consumables available.

 

Regards,

Vaibav Joshi

 

On Thu, Sep 8, 2011 at 6:32 PM, Abid Inamdar <abidinamdartech@gmail.com> wrote:

Ok, the details are:

Tube sheet material is HIC SA516, Thickness: 1" and 1.5" with J groove.

Tube material SA210 with 2.5 and 3.00mm thick.

Stength weld (first run with out filler wire and second run with filler ER70s2, 2.5mm dia filler.

Header: Closed type and welding from Plug holes.

 


I hope the details are OK.

 

regards

Abid

On Thu, Sep 8, 2011 at 12:08 PM, Pieper QSI <pieper-qsi@kpnmail.nl> wrote:

Dear Sir,

Before any member can give a useful reply some additional information is
required, such material kind and wall thickness of tube and tube sheet. Also
design code may be helpful to offer a solution.
Without this it's only a guess.

Met vriendelijke groeten / Best Regards

Herman Pieper

Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax:     +31 (0)84 7539225
Cell:     +31 (0)6 51691215
www.pieper-qsi.nl

-----Oorspronkelijk bericht-----
Van: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] Namens Inamdar
Verzonden: donderdag 8 september 2011 7:05
Aan: Materials & Welding
Onderwerp: [MW:12370] Hardness in Tube to tube sheet welding

I seek some guidance in the above.
Our Hardness for tube to tube sheet welding is coming above 250HV and the
desired value is 210 Avg.
Can some body explain me the below:
1) Which code clealy specifies the maximum acceptable value of hardness in
TTS welding.?
2) How to control the hardness without PWHT in TTS welding?

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