Hi Pramod,
Phosphorus to a limited extent increases the mach ability of steel. However it's effect on weldability is terrible.
Beyond the range specified below, it affects weldability through formation of low melting embrittling compounds which solidifies in the grain boundaries. This leads to commonly known solidification cracks e.g "hot cracks".
Also "P" in addition to As,Sb & S causes significant embrittlement, known as temper embrittlement manifested as significant reduction in impact strength.
See the articles listed below for further information. Pressure vessel and high strength structural steels even restrict "P" to further lower limits, e.g -0.04% or even below.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pramod Kulkarni
Sent: Friday, November 02, 2012 12:39 AM
To: materials-welding@googlegroups.com
Subject: [MW:15834] Role of phosporous on weldability of steel
Request to confirm why Phosprous is very low in weldable steel ( 0.05 Maximum ).
How it affect weldability
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