HI
Recently I have encountered a problem in which my carbon steel component is heavily corroded. The component is made up of rolled plates which we recently purchased. I have done XRD analysis of the scale to see if high corrosion rate is due to rolled in scale present on the plates as heavy...
Hi Guys,
I am appearing in API RP 571 certification exam. Need your guidance how I should prepare for an examination and what kind of questions do I expect.
Thanks in advance.
@Weldstan
Yes the magnification is same for all the photographs which is 200X. Yes this is my concern about the grain growth. Typically the grain doesn't look like this in the HAZ region.
@metengr
No have not checked yet. Its a good idea to see the hardness value. i will update you about the...
Hi Guyz,
Kindly help in analyzing the microstructure in the HAZ region of the welded plate (ASME SA516 Grade 70
Plates after welding are Post weld heat treated.
Just wanted to confirm if there is any harmful microstructure in the HAZ region which is making the impact values very less.
The...
The max. Sulfur content allowed in the specification is 0.002% but it was found that S content is actually 0.004%. This could explain the presence of inclusions (MnS)
@Pradipgoswami
Thanks for your reply. Yes stringers were observed throughout the length of the crack.
The HIC test was carried out as per the requirements of NACE TM0284.
Pipe is seam weld pipe and the sample was extracted near the weld.
a) Pressure: H2S concentration, saturated condition =...
metengr
Sorry to missed the red circles. Actually the micro graph is not giving correct contrast but i see clear differentiation in contrast under the microscope. These inclusions are located at few locations inside the crack. literature states that the presence of inclusions makes the material...
Hi
I have 1 metallurgical sample of API 5L grade X65MS pipe.
I have done micro structure analysis and found microstructure to be granular bainite.
Let me know with your experience if my interpretation is right.
Also there is an HIC crack and in that crack i found inclusions marked by red...
HI Blacksmith37
Hic test was included in the PO
Hi Sjones
Chemical analysis is under progress and i am waiting for results let see what will be the values
Hi Pradipgoswami
This was already considered by the manufacturer.
However i have checked the micro-structure and crack morphology and...
Hi i have 2 samples from different Api 5l X65 pipes which failed NACE hic test. I am looking for a root cause analysis. Based on your experiences can you please guide me what to check specifically in microstructure analysis? Inclusion content in unetched conditions will be useful? Any other...
