Asume Conde B31.3 in PWHT section is ndicated what time and temperature fdoyou need for making stress relief.
Specif section un this moment I can not tp tell you.
Also you hace todo consider Asme Conde VIII snd Asume Conde IX
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--At what temperature was PWHT, holding time, cooling rate.
Jim Price | Welding Engineer, CWI
Direct: 320.7463439 | Fax: 417-862-5564
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sathish Kumar
Sent: Friday, May 20, 2016 3:56 AM
To: Materials & Welding
Subject: [MW:24816] Hardness issue on weld metal
Dear Experts
We have recently welded 1/2" thick and 1" Thick pipes, Material : AISI 4130. Our hardness requirement is 197BHN-237BHN
This pipes are groove welded to same size of the pipes, Followed by GTAW(ER100S-G) & SMAW(E10018-D2) process. Root is followed by GTAW and SMAW for fill up and capping.on completion of PWHT we observed following hardness value.
After completion of welding and PWHT, we have found hardness range of 285HBN and 265HBN on weld metal. Also we performed PMI on the weld metal to determine the hardness issue, during the result we found following chemical composition on the weld metal respectively.
Tabulation shows actual chemistry of the T.C
Chemistry observed as per the T.C
Size
C
Mn
Si
S
P
Cr
Ni
Mo
V
Cu
E10018-D2
3.2mm
0.074
1.980
0.550
0.009
0.022
0.460
0.400
4mm
0.068
1.940
0.510
0.008
0.021
0.690
0.370
5mm
0.062
1.980
0.470
0.009
0.019
0.630
0.340
Tabulation shows actual chemistry after PMI inspection
CHOKE & KILL Line
Chemistry observed as per the PMI
Other metals
Weldment area
C
Mn
Si
S
P
Fe
Cr
Ni
Mo
V
Cu
Ti
On Weld Metal 90°
2.00
95.33
0.047
0.807
0.486
0.03
0.024
1.2667
On Weld Metal 180°
1.966
96.616
0.033
0.838
0.486
0.00
0.058
0.00
On Weld Metal 270°
2.060
96.443
0.057
0.902
0.492
0.00
0.044
0.00
On Weld Metal 360°
2.115
96.401
0.363
0.907
0.501
0.00
0.037
0.00
BOOSTER Line
Chemistry observed as per the PMI
Other metals
Weldment area
C
Mn
Si
S
P
Fe
Cr
Ni
Mo
V
Cu
Ti
On Weld Metal 90°
1.946
95.287
0.150
0.915
0.500
0.021
0.150
1.113
On Weld Metal 180°
1.992
96.362
0.152
0.932
0.491
0.00
0.152
0.00
On Weld Metal 270°
0.203
96.303
0.203
1.121
0.490
0.00
0.203
0.00
On Weld Metal 360°
0.252
96.556
0.252
0.735
0.480
0.00
0.252
0.00
On comparison of chemistry for actual observed in the T.C and PMI result varies accordingly, those variation exceeds the standard requirement of ASME Sec II part-C. Those variation are tabulated for your reference, also PMI is taken on the undiluted weld metal of the capping.
We suspect that due to exceed of Mn and Ti, hardness increased. Please suggest or advice on the following issues.
NOTE-
Interpass Temperature maintained: 300°C
Preheat Temperature maintained: 210°C
Regards
S.Sathish kumar--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
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