Re: [MW:0] Inservice failure

On Sun, Jul 11, 2010 at 5:42 PM, pankaj abhang <pankaj.abhang1@gmail.com> wrote:

Dear Vaidehi,

 Sorry for previous data incorrectly sended. 

   Please find the actual values:-

 

The Chemistry for the Tubes as given below

 

The Material Grade is-  SA249 TP 304.

 

C (MAX)- 0.08       Observed- 0.054

 

Mn (Max)- 2.00     Observed- 1.14

 

P (Max)-0.045       Observed-0.033

 

S (Max)-0.030       Observed- 0.006

 

Si (Max)-1.00        Observed- 0.42

 

Cr (Max-20 Min-18) Observed- 18.07

 

Ni (Max-11- Min -08) Observed- 8.21

 

 

 

Observed UTS Values- 651.4(Mpa)

 

Elongation- 62 mm

 

Hardness- 69-70

 

Micro- ASTM Grain size No.7

Heat Treatment- Solution annealed at minimum 1040 celcius & rapidly water quenched.

 

 

 

 

PANKAJ

 

 

 

 

On Sun, Jul 11, 2010 at 4:14 PM, Vaidehi Ganesan <vaidehi@igcar.gov.in> wrote:

What is the material, compositions?

best regards,

Vaidehi Ganesan.

=============================================================

Dr. Vaidehi Ganesan,

Metallurgy & Materials Group,

IGCAR, Kalpajkkam-603 102, India.

=======================================================

----- Original Message -----

From: pankaj abhang

To: materials-welding@googlegroups.com

Sent: Sat, Jul 10, 10 10:15

Subject: [MW:5924] Inservice failure

Dear Members,

 

We had supplied a Finned tube radiator after 1 year in service the header to tube joint getting shearing off near 10-15 mm from weld joint. what will be the reason for the failure.

 

Details are as given below-

 

Tube inside process fluid- Steam at 200 celcius

Tube MOC- SA 240 TP 249

Tube Thickness-2 mm

Header pipe -3"NB sch10s

Header MOC- SA 240 TP 312

Welding Joint- UW 16.1(d)

Welding Technique- GTAW

Working pressure- 15 bar(g).

 

 

PANKAJ

 

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