Small size fitting and wrought steel

[sks4338]

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?

 

[1969grad]

Common practice is to butt weld pipe 2" and larger and either socket weld or thread pipe less than 2".

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.

 

[grandnobi]

1969grad,

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."

 

[PAN]

sks4338,
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.