ASTM A234 WPB steel pipe fitting chemical and mechanical features
Grade WPB fittings made from the steel pipes or plates maximum C is
0.35%.
Forging fittings Carbon content 0.35% maximum and Silicon content
0.35% maximum, no minimum.
For each reduce of 0.01 of Carbon content, Manganese maximum
content increase 0.06%, up to the maximum 1.35% for Mn.
Copper, Nickel, Niobium and Molybdenum sum content shall not exceed
1.00%.
Niobium + Molybdenum shall not exceed 0.32%.
For other grades:
Mechanical properties of ASTM A234 WPB pipe fittings
Tensile Strength 60,000 pis 415 Mpa
Yield Strength 35,000 psi 240 Mpa
Pressures Ratings: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS,
2000 LBS, 3000 LBS to 9000 LBS.
For other grades in ASTM A234:
ASTM A234 includes seamless and welded pipe fittings
For the seamless steel pipe fittings refers to the fittings raw
material from the seamless steel pipes and tubes;
Thus the welded steel pipe fittings covers the fittings raw
material from welded steel pipes.
It shall be noted that,
ASTM A234 specification does not cover cast welding fittings or
fittings machined from castings.
Steel pipe fittings manufacturing forming processes
The manufacturing processes for pipe fittings includes forging and
shaping operations. As well as pressing, hammering, piercing,
extruding, upsetting, rolling, bending, fusion welding and
machining. Or the processes of combination of two or more of these
operations.
During the manufacturing steel pipe fittings, below activities
shall be noted:
1, Injurious imperfections, welding defects shall be not created.
2, After shaping or forming the fittings in a suitable temperature,
it shall be cooled in a appropriate environments to a temperature
that below the critical range. And no defects shall be made during
the cooling procedures. The cooling rapid shall be not more than in
the air.
3, Suitable inspection shall be performed after manufacturing.
(Hydrostatic test, hardness test, tensile test etc)
