ANSI B 16.47 SER “A” (MSS SP 44) FLANGES
a) The steel used in the manufacture of the flanges shall be selected to meet the following
b) The F48 and higher grades of class 400,600 and 900 flanges shall be killed steel.
c) The steel used shall be suitable for field welding to other flanges, fittings, or pipe
manufactured under ASTM specifications A105, A53, A106, A381, or API standards 5L and
d) The steel used shall have a maximum carbon content of 0.35 and a carbon equivalent
computed by the following equation:
That should not exceed 0.56%, based on check analysis. If the carbon equivalent factor
exceeds 0.5%, the acceptance of the flanges shall be based on agreement of customer.
e) The choice and used of alloying elements , combined with the elements within the limits
prescribed in paragraph A.d) to give the required tensile properties prescribed in paragraph A.f)
shall be made by FELIX and reported in the chemical analysis to identify the type of steel.
f) The steel used shall have tensile properties conforming to the requirements prescribed in
B. HEAT TREATMENT
The F42 and higher grades of flanges of all pressure classes and the class 400 and higher classes
of grade F36 flanges shall I normalized or quenched and tempered.
C. TEST SPECIMEN
The test specimens may be taken from the forgings, or the manufacturer’s option, from the billets
or forging bar entering into the finished product, provided such test blank has undergone relatively
the same forming and the equivalent heat treatment as the finished flange. The dimensions of the
test blank must be such as to adequately reflect the heat treatment properties of the hub of the
ANSI B16.47 SER. A(MSS) FORGED FLANGES
Yield Point Min. Tensile Strength Min.
KSI Mpa KSI Mpa
Elongation in 2In.
F36 36 248 60 414 20
F42 42 290 60 414 20
F46 46 317 60 414 20
F48 48 331 62 427 20
F50 50 345 64 441 20
F52 52 359 66 455 20
F56 56 386 68 469 20
F60 60 414 75 517 20
F65 65 448 77 531 18