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Elbow

A234 WPB

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ASTM A234 specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, and MSS-SP-95. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.


Chemical Composition (%) of ASTM A234

Grade C Mn P S Si
WPB 0.3 0.29-1.06 0.05 0.058 0.1min
WPC 0.35 0.29-1.06 0.05 0.058 0.1min
WP11 CL1 0.05-0.15 0.30-0.60 0.03 0.03 0.50-1.00
WP11 CL2/3 0.05-0.20 0.30-0.80 0.04 0.04 0.50-1.00
Grade Cr Mo Ni Cu V Nb
WPB 0.4 0.15 0.4 0.4 0.08 0.02
WPC 0.4 0.15 0.4 0.4 0.08 0.02
WP11 CL1 1.00-1.50 0.44-0.65 - - - -
WP11 CL2/3 1.00-1.50 0.44-0.65 - - - -

GENERAL NOTE:
All values are maximum unless otherwise indicated.

NOTES:

  1. For each reduction of 0.01% below the specified C maximum, an increase of 0.06% Mn above the specified maximum will be permitted, up to a maximum of 1.35%.
  2. The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.
  3. The sum of Cr and Mo shall not exceed 0.32%.
  4. The maximum carbon equivalent (C.E.) shall be 0.50, based on heat analysis and the formula C.E.=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.

Mechanical properties of ASTM A234

Tensile Requirements WPB WPC, WP11CL2 WP11CL1  WP11CL3
Tensile Strength, min, ksi[MPa] 60-85 70-95 60-85  75-100
(0.2% offset or 0.5% extension-under-load) [415-585] [485-655] [415-585]  [520-690]
Yield Strength, min, ksi[MPa] 32 40 30 45
[240] [275] [205] [310]

Where the wall thickness lies between two values above, the min elongation value is determined by the following equations:

Longitudinal E=48t+15.00
Transverse E=32t+10.00
E = elongation in 2in [50mm], %
t = actual thickness of specimen, in [mm]