ASTM A234 WPB-S ELBOW 45/90 DEGREE CARBON STEEL B16.9 BLACK
PAINTING
Steel elbow is used to be installed between two lengths of pipe or
tube allowing a change of direction,usually these carbon steel
elbows distinguished by connection ends, The ends may be machined
for butt welding , threaded , or socketed , so the carbon steel
elbows are consist of butt weld,thread elbow socket elbow and other
series.the material is selected according to the application use
such as high temperature use,sanitary fitting,regular industrial
use etc.
- ASTM A234 fittings material consist of killed steel, forgings,
bars, plates, seamless or HFW (fusion welded) pipe products, with
filler metal added.
- ASTM A234 standard covers steel fittings of seamless and welded
types. ASTM A234 Pipe fittings are applied in pressure pipelines
and in pressure vessel fabrications.
- ASTM A234 / A234M-07 Standard Specification for Piping Fittings of
Wrought Carbon Steel and Alloy Steel for Moderate and High
Temperature Service
ASTM A234 Scope:
- This 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. Fittings differing from these ASME and MSS Standards
shall be furnished in accordance with Supplementary Requirement S58
of Specification A 960/A 960M.
- Optional supplementary requirements are provided for fittings where
a greater degree of examination is desired. When desired, one or
more of these supplementary requirements may be specified in the
order.
- This specification does not cover cast welding fittings or fittings
machined from castings. Cast steel welding fittings are governed by
Specifications A 216/A 216M and A 217/A 217M.
- This specification is expressed in both inch-pound units and in SI
units. However, unless the order specifies the applicable “M”
specification designation (SI units), the material shall be
furnished to inch-pound units.
- The values stated in either inch-pound units or SI units are to be
regarded separately as standard. Within the text, the SI units are
shown in brackets. The values stated in each system are not exact
equivalents; therefore, each system must be used independently of
the other. Combining values from the two systems may result in
nonconformance with the specification.
Chemical Composition (%) of ASTM A234:
Grade | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | V | Nb |
WPB | 0.3 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
WPC | 0.35 | 0.29-1.06 | 0.05 | 0.058 | 0.1min | 0.4 | 0.15 | 0.4 | 0.4 | 0.08 | 0.02 |
WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.03 | 0.03 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
WP11 CL2/3 | 0.05-0.20 | 0.30-0.80 | 0.04 | 0.04 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - | - | - | - |
Notes:
- 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%.
- The sum of Cu, Ni, Cr, and Mo shall not exceed 1.00%.
- The sum of Cr and Mo shall not exceed 0.32%.
- 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]