Small size fitting and wrought steel
Small size fitting and wrought steel
(OP)
How do you make an elbow whose size is 1-1/2" & below, with bevel end?
Maybe you don't make it with forging, like A105 material.
Instead you make it with wrought steel, like A234-WPB.
It seems to me, even if it's a small size, the end type depends material you are using.
Size does not seem to be decisive factor.
Why is it like that?
Maybe you don't make it with forging, like A105 material.
Instead you make it with wrought steel, like A234-WPB.
It seems to me, even if it's a small size, the end type depends material you are using.
Size does not seem to be decisive factor.
Why is it like that?





RE: Small size fitting and wrought steel
Fittings less than 2" are usually forged - that is A105. Larger size fittings are castings - that is A234. I am sure the choice of material is an economic issue and where the break point is I would have to check out someone's catalog.
If you want to know what the fitting looks like then look at a Ladish or B and W catalog.
Bevel end design is specified by B31.8, B31.4, B31.3. One of the appendices has a several figures showing the bevel which depends on the wall thickness.
RE: Small size fitting and wrought steel
A234 are not castings.
See ASTM A 234 - Par.1.3:
"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."
RE: Small size fitting and wrought steel
In my country, the manufacturer make elbow A234-WPB from pipe API 5L-B or A106-B. I'm not sure about the size less than 2". However, the plain end for butt welding should be acceptable for small size elbow (low thickness). Bevel end should not be a requirement for general case.