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Satanphop Amsupan.. Influence of the welding on the HAZ properties of T23 (7CrWVMoNb9-6) joints. Master's Degree(Materials and Metallurgical Engineer (English Program)). King Mongkut's University of Technology North Bangkok. Central Library. : King Mongkut's University of Technology North Bangkok, 2014.
Influence of the welding on the HAZ properties of T23 (7CrWVMoNb9-6) joints
Name: Satanphop Amsupan.
keyword:
Heat Affected Zone.
LCSH:
Dissimilar welding.
Abstract:
The creep-strength enhanced ferritic (CSEF) grade 23 steel, commonly known as T23 or P23 and addressed by the ASME Code Case 2199-6, is a 2Cr-1.6W-V-Cb grade strengthened by the presence of vanadium nitride precipitates, specifically designed to allow welding without Post weld heat treatment (PWHT). T23 and the similar CSEF grade known as T/P24, have found application in the most advanced designs for fossil fuel fired boilers, specifically waterwalls, as well as in heat recovery steam generators (HRSGs). However, concerns have recently been raised with regards to the susceptibility of grades 23 and 24 cracking occurring during fabrication, stress corrosion cracking and sulphide stress corrosion cracking, which have been identified in as-welded joints exhibiting relatively high HAZ hardness, hence bringing into question the typical practice regarding preheat and the omission of PWHT. Following a review of recently published literature, this paper presents the findings of an experimental program aimed at evaluating the effect of preheat on the as welded HAZ hardness of thin welds in T23 and dissimilar metal welds with T91, with a view to suggesting conditions for exemption. The potential use of the temper bead technique was also evaluated. The experimental program included hardness testing and metallographic evaluation
King Mongkut's University of Technology North Bangkok. Central Library
Address:
BANGKOK
Email:
library@kmutnb.ac.th
Name: Kumpanat Sirivedin
Role:
Thesis advisor
Email :
kumpanat.s@tggs.kmutnb.ac.th
Name: Bovornchok Poopat
Role:
Thesis advisor
Email :
bpoopat@yahoo.com
Created:
2014
Modified:
2021-02-19
Issued:
2021-02-19
วิทยานิพนธ์/Thesis
application/pdf
eng
DegreeName: Master of science
Level: Master's Degree
©copyrights King Mongkut's University of Technology North Bangkok
RightsAccess:
ใช้เวลา
0.034654 วินาที
Satanphop Amsupan.
| Title | Contributor | Type |
|---|---|---|
| Influence of the welding on the HAZ properties of T23 (7CrWVMoNb9-6) joints
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Satanphop Amsupan.;Kumpanat Sirivedin,;Bovornchok Poopat, | Kumpanat Sirivedin Bovornchok Poopat | วิทยานิพนธ์/Thesis |
Kumpanat Sirivedin
Bovornchok Poopat