Search results for query: *

Thanks, mrfailure

metengr, thanks. My concern is if the temperature reached lower critical temp. or upper critical temp. before. If these structures are Widmanstätten structures (since some colonies have this features), then I would know the tube temperature at least close or above upper critical temp, possibly...

Add little bit: the tube examined was not bulged or ruptured. There may be some overheated tubes elsewhere in the reheater (not sure bulged or ruptured).

metengr, thanks. I don't have the equipment for hardness testing, so don't know the hardness. Actually, microstructure shows some long term overheating characteristics. But I was wondering if it is possible that the tube was overheated to temperatures above lower critical transformation...

Sorry, accidentally click "submit post" with no attachment. I attached three photos in three separate replies. These photos show microstructures for a reheated tube (T12) that was in service for a period of time. Seems like it has spheroidized carbide colonies and ferrite matrix. But some...

I attached three photos in three separate replies. These photos show microstructures for a reheated tube (T12) that was in service for a period of time. Seems like it has spheroidized carbide colonies and ferrite matrix. But some colonies has lamellar or needle like features. Are these...

Thanks guys. Very useful information. I attached three photos in three separate replies. These photos show microstructures for a reheated tube (T12) that was in service for a period of time. Seems like it has spheroidized carbide colonies and ferrite matrix. But some colonies has lamellar...

Thanks guys. The attached are some photos of a reheated tube (T12) that was in service for a period of time. http://files.engineering.com/getfile.aspx?folder=78155700-d970-4822-9f37-65eb5414e43c&file=2.jpg

Does any one know the microstructure for low alloy steel SA213-T11/T12? ASME code shows that these alloys should be fully/isothermally annealled or normalizing + tempering. Can some one advise what microstructure formed after the above heat treatments, or show me some photos? Thanks a lot.

What filler metal should be used for 316/316L Stainless Steel to Alloy 20 welding (GTAW process) Thanks a lot.

Hi, I need your advice of the ASME VIII DIV.1 regarding the following two issues: (1) The distance of the circumferential weld seam and nozzle reinforced pad is only 1 inch (Circumferential joint to the fillet joint of the re-pad). (2) The circumferential weld seam is covered by the...

This WPS will be used for F.P. groove. So the qualifid thickness range shall be 5-10mm, as stated by Metengr.

Hi all, I have a question on the vendor's welding procedure. ASME IX is used for the welding procedure qualification. PQR: GTAW + SMAW; Test coupon thickness: 23.83mm; Deposited welds thickness: GTAW: 5.0mm; SMAW: 18.83 WPS: GTAW According to ASME IX QW-403.8 and QW-451.1, the qualified base...

metengr: Thanks for you reply If B31.3 is not used for the qulification, what is the range T/2 To (T/2 + 0.25") used for?

This is a question about the impact test carbon steel piping (Low Temp. Carbon Steel). The fabrication code for Low Temperature Carbon Steel is B31.3. The vendor is planning to use a 0.5" thick pipe to qulify the piping thickness range from 0.25"-0.75". According to ASME IX QW-403.6, the...

metengr: Thanks.

Hi, I am reviewing the vendor’s WPS/PQR on FCAW welding process. I need your help. Shielding gas is not used in the PQR. However in the WPS, CO2 is used as the shielding gas for FCAW process. Suppose the other parameters are the same, can we use this PQR to support the WPS? ASME IX 408.2 (d)...

We have two Carbon steel Towers (ASME VIII Div.1) is in Wet H2S service and caustic service respectively. The vessels will be PWHT'ed. Do we need to do PWHT for the carbon steel internals? These internals are not pressure part, do we need to take care of the caustic cracking or H2S cracking?

For SAW, can flux used for PWHT be used for non-PWHT welding? For example, can F7P2 designation be used for Non-PWHT welding?

I heard that the manufacturer perform PWHT for Cr-Mo tube to tube sheet welds. Is it true?