Re: [MW:33226] Hardness Issue on weld metal

One recommended practice is to reduce hardness is cooling rate is longer than heating rate.

On Wed, 13 Jul 2022, 17:10 williams p wilson, <williamswilsonp@gmail.com> wrote:

Dear,

What will be the range, please explain

Thank You & Regards

Williams P Wilson

QA/QC Engineer

Welding Inspector (CSWIP 3.1)

Cell: (+968) 94600828

P Please consider the environment before printing this message

On Wed, Jul 13, 2022 at 3:38 PM pradip kumar Sil <pradipsil@gmail.com> wrote:

Re PWHT you can do to minimize hardness

On Wed, 13 Jul 2022, 16:52 williams p wilson, <williamswilsonp@gmail.com> wrote:

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

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

P Please consider the environment before printing this message

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