Stainless Steel, duplex and super duplex need charpy or not?

[skrie85]

Hi all,

I have one query about the charpy impact test. Do the stainless steel (P-No.8), Duplex & Super Duplex (P-No.10H) required charpy impact test or not? If yes, what condition which I need to consider when doing the charpy impact test and where can I refer?

Thank you,

Regards,
Shukri

[JASPAL SINGH]

Dear Shukri,

Impact Test is required in SS, DSS, SDSS also as per following
details:

Section VIII-Div 1- UHA-50 is applicable.

Base material is exempted from impact testing in Austinitic SS(P8)
upto -196 degree centigarde MDMTor warmer

Base material of Duplex & Super Duplex is Exempted upto -29 degree or
warmer if thickness is less than 10mm, please note for thickness more
than 10mm impact is required.

Please note for P8 weld metal exemption is applicable upto -104 degree
centigarde only, while for 10H the same upto -29 degree with thickness
limitation.

In case of thermal treatment above exemptions are not applicable the
same is revised for P8 from -196 to -29.

The other condition to get the impact examption is by calculating
Coincident Ratio of Design Stress , if less than 0.35 we can get the
impact exemption in base metal as well as in welding procedure/
production test coupen.

Regards


Jaspal Singh, CWI-AWS, CSWIP-3.1
Assistant Manager – Quality Assurance
Process Equipment Division
ISGEC, Yamuna Nagar, Haryana -135001
Phone: 911732307251
Ext: 251 Mb: +918930111441

[manpreet]

Dear Mr. Shukri

What is the construction code?

To decide whether Impact testing shall be performed on a material, you should ist decide MDMT.

UG-20 requires the MDMT to be established for the lowest operating temperature, operational upsets,auto-refrigeration, atmospheric temperature, or any other sources of cooling.

Once you decide MDMT, Refer UHA-51 to decide whether impact testing is applicable or not?

Regards
Manpreet Singh
Welding Engineer
Spiecapag




On Sat, 07 Aug 2010 08:50:44 +0530 wrote

--
>
To post to this group, send email to material...@googlegroups.com
>
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
>
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
>
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>