Saturday, September 1, 2007
X-Factor (Bruscato Formula)
The J Factor, developed by Watanabe, is commonly used to specify the temper embrittlement resistance of CrMo base metals e.g. ASTM A387 Gr 22.The X Factor, developed by Bruscato, (a.k.a. X Bar) is commonly used when specifying certain filler metals e.g. EB3R. It is generally understood that the deposited weld metal must meet less than or equal to 15X Factor. This deposit will have maxium resistance to temper embrittlement. This phenomen typically occurs at service temperatures between 850-1050 degrees F.
J & X Factor Formulas:
J = (% Si +% Mn) ( % P + Sn) x 10 power 4
X= (10 P + 5 Sb + 4 Sn + As) (elements in ppm) / 100
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