ANSI B 16.47 SER “A” (MSS SP 44) FLANGES

- Sep 06, 2017 -

ANSI B 16.47 SER “A” (MSS SP 44) FLANGES

A. MATERIALS

a) The steel used in the manufacture of the flanges shall be selected to meet the following

requirements.

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

5LX.

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

following table.

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

flange.

ANSI B16.47 SER. A(MSS) FORGED FLANGES

Yield Point Min.  Tensile Strength Min.

Grade

KSI  Mpa  KSI  Mpa

Elongation in 2In.

Min. Recent

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


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