ASTM Specifications for Weld Fittings and Flanges

 
BUTT WELDING FITTINGS
Carbon Steel Material Specification
  ASTM Specification A234  
GRADE
SYMBOL
WPA
(Grade A)
WPB
(Grade B)
Type of Steel Carbon Carbon
Chemical Composition C-0.25 Max. C-0.30 Max.
Minimum Physical Requirements TS - 48,000 | YP - 30,000 TS - 60,000 | YP - 35,000
Heat Treatment Cooled in still air. Cooled in still air.

FLANGES
Carbon Steel Material Specification*
  ASTM Specification A181 ASTM Specification A105
GRADE
SYMBOL
I II III IV
Type of Steel Carbon Carbon
Chemical Composition C-0.35 Max. C-0.35 Max.
Minimum Physical Requirements TS - 60,000
YP - 30,000
TS - 70,000
YP - 36,000
TS - 60,000
YP - 30,000
TS - 70,000
YP - 36,000
Heat Treatment Hot forged with finishing temperature above upper critical. Cooled in still air. Hot forged with finishing temperature above upper critical. Cooled in still air.

*Material specifications for the ASME Boiler Code are the same as ASTM except the letter S is prefixed thereto.
A 35% Carbon maximum for flanges which are to be welded has been established by ASTM A181 and A105.

Grade and Composition Symbols for
Carbon Steel Butt Welding Fittings
WPA Seamless Pipe ASTM A106 Grade A
Plate ASTM A285 Grade C
Forgings ASTM Grade 1
Bars* ASTM GR. 1008-1022
WPB Seamless Pipe ASTM Grade B
Plate ASTM Grade 6S
Forgings ASTM Grade 11
Bars* ASTM GR. 1025-1030
WPC Seamless Pipe ASTM A106 Grade C
Plate -
Forgings ASTM A104 Grade 11*

* For fittings 2" nominal size and smaller

Low Temperature Carbon Steel

 
WPLO Seamless and Welded Pipe ASTM A332 Grade O
Plate ASTM A300 Class 1
Forgings ASTM A350 Grade LF1


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