Please read through ASTM A 262.The function of IGC testing, B,C,D,E are to detect the level of sensitization and loss of intergranular corrosion resistance. A262 Practice A is done as a quick screening test for 300 series steels, as explained previously. It's Oxalic Acid Etch Test for...
Chitessy,
Please refer this link below. Welding of this steel with all pros and cons are well explained. Best properties in welding of this steel are achieved,with matching welding electrode and adopting PWHT.
Thanks.
http://www.metrode.com/SiteData/en-gb/File/410%20Types.pdf
Pradip...
Quote:
Service: SO2/SO3
Temperature:120-125F
There is a possibility that water could get in the system.
Unsure whether the corrosion is in the weld or haz or both.
EDIT: We are located in the US. We have not had the ASTM IGC test done. I will recommend it to them when we pull the piping this...
Usually NBIC-23 or API-510 is commonly followed for repair & alterations. If you decide to follow NBIC, then existing welding procedure has to meet all requirements of Welding Method-1 OR 2, as referred in Part-3 of NBIC. If not a repair procedure should be qualified before any weld build-up...
Hi Benabed,
As stated by Steve Jones a thorough failure analysis(Not Speculative)and resultant engineering or operational modifications would add to long term solutions and would be more value added. This is more so as the damage is repetitive. As you're in the petroleum industry, I presume...
Abanamat,
If NACE SP-0472 is a binding specification, then the PWHT recommendations of this document should be followed to mitigate ASCC. Suggested PWHT @635 ±15°C(1175±25°F),with a short soaking cycle may not harm the mechanical properties significantly. However longer soaking time @ 640-650...
Few questions:
Is SP-0472 referred as one of the applicable document for the project, or just is to be referred for guidance?.
Note:- PWHT procedures as described in Paragraphs 3.4 and 3.5 of SP-0472 can negatively affect the tensile strength and impact toughness of the base metal. Each...
Hi Timsch,
This clause has more complications than thought of as there are multiple PWHT scenarios involved in any procedure qualification. This is so as any change of PWHT condition is a mandatory and essential variable under QW-253 and beyond.
A NEW PQR is required for each of the following...
Hi ,
This vessel is constructed of C-0.5Mo steel with Ferritic(405) SS. cladding. I'm assuming cracks are on the wetted surface (FSS).If the depth of is very shallow, the ground area is rounded off and blended well, and client regularly monitors further damage mechanism, a deviation from regular...
Hi You may find some information on impact properties of 17-4 pH steel in the following data sheet. However the data is for bars, which are forged products. Valves involves a lot of casting, hence the mechanical properties may fluctuate widely. One has to be very careful about selection and...
This specification is a general specification for Nickel Forgings and reads as follows:-
This specification covers forgings of nickel alloy UNS N02200, Ni-Cu alloy UNS N04400......... and many more.
You have to be specific about the grade and specification of forging and accordingly look for...
C276 Hastelloy ( P43 ) filler for a P1 #P8 weld joint would be highly over blown?? One may pass Sec-IX test with C-276 filler.I would say this would have been the choice for a P1 to Hastelloy weld joint.
309L/309LMo makes bulk of the DMW's between P1#P8,the other selection is In-82/In-182...
Insulated blanket over austenitic stainless steels would harm stainless steels more than doing good. 304, 316 grades are never hardenable by any heat treatment. Only allowed heat treatment is Solution Anneal: Heating and Soaking @ 1000-1040 Deg C followed by water quenching.
Slow cooling would...
Please get a copy of AWS D-10.10-2008, the industry wide standard for Local Preheat and PWHT. Heating and Soaking band & GCB(Gradient Control Band) are well explained with diagrams. The essential need of the soak band & GCB is to reduce differential thermal stress on the metals being PWHT-ed...
Hi I cant tell about the 1350F-1425F range. However as stated earlier by Metengr, ASME code case 2179-7,January 29, 2009(Seamless 9Cr-2W Material Section I and Section VIII, Division 1,provides Maximum Allowable Stress up to 1200 Deg F.
My understanding :allowable stress up to 1200 Deg F is...
Whether it's Carbon Arc Gouging or Plasma Arc Gouging for stainless steel it's the educated call of the fabricator's. From my past shop floor experience with ASME U, U2, N, NPT stamped fabricators, I had observed a great deal of hesitation in application of Carbon Arc Gouging for back gouging...
Sol71,
Quotes from TM0177-2005:-
Method A, the NACE Standard Tensile Test, provides for evaluating metals for EC resistance under uniaxial tensile loading.It offers a simple unnotched test specimen with a well-defined stress state. EC susceptibility with Method A is usually determined by...
MSEN,
Stainless steels are NEVER cut or gouged by Carbon Arc Gouging. Leave aside the issue of Carbon Buildup, the surface would be full of serrations, which is going to make the grinders life totally miserable. Considering the grinding involved, resulting wastage of time and costly stainless...
Dhurjoti,
Thanks for your comment "Metallurgical Engineers are really a dying breed". It's not a dying breed, it's the discipline one only remembers when someone is in dire straits..
Regards.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299
Prode333,
Please refer the following links which I hope will clear your doubts to certain extents:
1. https://www.azom.com/article.aspx?ArticleID=1141
2. https://www.asminternational.org/documents/10192/23555666/ASM+Subject+Guide_HeatTreating.pdf
3...
