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patelsm
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Join Date: May 2010
Posts: 1

J Factor

05/26/2010 5:48 AM

Dear Sir,

In 1 1/4 Cr-1/2 Mo material J factor is not required, While in case of 2 1/4 Cr-1Mo material J factor is required to calculate. Can you explain me why J factor is required? What is impact on material with consideration of J factor? Why J Factor is not calculated for 1 1/4Cr-1/2 Mo material? What is the effect of J factor on material mechanical properties?
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anoopbindal
Associate
Engineering Fields - Piping Design Engineering - New Member

Join Date: Mar 2009
Location: Mumbai
Posts: 41
Good Answers: 1
#1

Re: J Factor

05/27/2010 10:11 AM

2 1/4 Cr-1 Mo is basically P22 grade material of alloy steel. Due to its comparatively high Mo content it can be used at high temp. But it is susceptible to temper embrittlement (like hydrogen embrittlement) more severely at the heat affected zone. J factor is calculated to determine the tendency of material to undergo temper embrittlement. Step cooling is generally done for P22 Type to avoid temper embrittlement. J factor can be reduce by reducing the content of Silicon.

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