Raised Face Flanges

About Raised Face Flanges

Raised face flanges are defined by their face geometry rather than by a unique alloy in practice they re made from the same base materials as other flanges. The most common grades and their typical chemical compositions are:

1. Carbon steel raised face flanges (ASTMA105)
   Same as "Custom Flanges per ASTMA105:

   • C 0.35%

   • Mn0.60 1.05%

   • P 0.035%

   • S 0.040%

   • Si0.10 0.35%

   • Cu, Ni 0.40% each

   • Cr 0.30%, Mo 0.12%, V 0.08%

   • Febalance

2. Stainless steel raised face flanges (ASTMA182 F304 & F316)

   Element	F304 (%wt)	F316 (%wt)
   Carbon (C)	0.08	0.08
   Manganese (Mn)	2.00	2.00
   Silicon (Si)	1.00	1.00
   Phosphorus (P)	0.045	0.045
   Sulfur (S)	0.030	0.030
   Chromium (Cr)	18.0 20.0	16.0 18.0
   Nickel (Ni)	8.0 12.0	10.0 14.0
   Molybdenum (Mo)		2.0 3.0
   Nitrogen (N)		0.10
   Iron (Fe)	Balance	Balance

3. ASTMA182F304 ("304SS ): the 18%Cr 8%Ni austenitic alloy for general purpose service

• ASTMA182F316 ("316SS ): adds Mo for superior chloride stress corrosion resistance in harsher environments