Hi,
Control of base metal composition (CE) to control hardness of the HAZ may not be enough because HAZ hardness is controlled not only by composition alone but also the cooling rate and subsequent heat treatment to prevent formation of hard microstructure.
Therefore composition control and thermal control are necessary.
On Sunday, 14 June 2020, 17:09:36 GMT+1, Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:
We have Pipe Line for Wet H2S service . PWHT is addressed in drawing by designer .
-- There are 3' to 96 " pipe lines with thk @4mm to 15 mm , made up of P NO 1 GR 1 - SA 106 Gr B material.
We intend to follow road map and avoid PWHT as below
1. Weld deposit - Weld deposit with ASME A-NO. 1 chemistry - maximum HARDNESS 248HV10
2.CE of base material Control Method (CE of production base metal shall not exceed CE of PQR specimen by 0.03 % and HAZ hardness check - maximum HARDNESS 248HV10
Is it intent of STANDARD Edition 2010 that HAZ Hardness Control (maximum HARDNESS 248HV10 ) shall be
by CE of base material Control (as stated above) AND One or more Thermal Methods .
Solely CE of base material Control is not sufficient .
Can the thermal Method be waived ?
Pl. guide further
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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