Dear Experts,
-- During the PQR qualification of ASTM A 519, Grade 4130 , Pipe 3" x Sch XXS material hardness value in SMAW weld metal area observed in b/w 247 to 283 HV.
The required value is in blw 201 to 241 HV, Base metal hardness also is in the same range.
Preheat temperature : 200 ° C
Interpass temperature : 300 ° C (Max)
Stress relieving details as follows,
600 ° C ± 10 ° C, Holding Time : 01 Hour
Cooling Rate : 150 ° C / Hour
Heating rate : 150 ° C / Hour
Unrestricted heating up to 300 ° C
Controlled cooling upto to 300 ° C
Heating rate : 150 ° C / Hour
Unrestricted heating up to 300 ° C
Controlled cooling upto to 300 ° C
Please reply with your valuable comments to reduce the high hardness observed in the weld metal.
Thank You & Regards
Williams P Wilson
QA/QC Engineer
Welding Inspector (CSWIP 3.1)
Cell: (+968) 94600828
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