Thursday, July 7, 2011

Re: [MW:11617] Phosphorus content in Material composition


Sulphur.
During solidification the centre of the weld is the last to cool. Sulphur from the parent plate forms
iron sulphide with iron from the weld pool. The iron sulphide forms a thin liquid film on the grain
boundaries, which has a lower melting point than iron, so as the weld cools it is pushed towards the
centre of the weld. The iron sulphide has very little tensile strength, so as it cools, the weld is under
stress and cracking will result. Phosphorous contamination in the material can also cause
solidification cracking.
Avoidance - Reduce sulphur (check mill sheets for levels < 0.03 %).
Cleaning (no oil, grease etc.).
Add manganese to the parent plate via the filler wire (forms manganese sulphide that
melts cools at approximately the same temperature as steel. Manganese sulphide is
more discreet therefore less cracking.).
 
Thank
Javed Iqbal
K S A
From: "Sachin.Shelar1@thermaxindia.com" <Sachin.Shelar1@thermaxindia.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Thursday, July 7, 2011 8:01 AM
Subject: [MW:11609] Phosphorus content in Material composition



        I would like to know what is the effect of Phosphorus content in material composition. How do we control phosphorus content if there is a specific requirement ( Is there any method). How much in % effect of Phosphorus content will affect the grain structure(any curves). Is there any specific requirement in NACE MR0175 &103 for % of Phosphorus content in material composition. Please specify references.

 
Thanking You.

Regards
Sachin Shelar
Sr. Engineer  - Process Engg
Thermax  Ltd.
Ph +91 20 66126775
E Mail: sachin.shelar1@thermaxindia.com
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