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Re: [MW:31334] Effect of high delta ferrite FN number (12-13) on welding of SS 304 L material

By Materials & Welding
Hi, it's due to high heat input and interpass temperatures should control within 100 degree Celsius. Person should monitor each pass and record amp, interpass temperature and all wps parameters. Check your wps and pqr within the above temperature limits and actual welding parameters .

Karthik
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On 18 Aug 2020, at 17:04, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:


Delta Ferrite in the range of 12-13 FN will affect during.

1. High temperature operation beyond 350degC
2. Since SS 304L also used at sub-zero temperatures presence of ferrite in the range 12-13 FN will affect the Impact properties
3. Results in formation of Sigma phase as it results in low notch toughness.
4. Affects the General atmospheric corrosion resistance of SS 304L

Some snap shots to support above.

<1597741832665blob.jpg>





On Tuesday, 18 August, 2020, 02:36:11 pm GMT+7, Aakash <harenathjha@gmail.com> wrote:


Hello Expert ,
please explain and also provide relevant documents  about effect of higher delta ferrite on SS 304L materials 

Regards

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