Weldbend ASTM A 234 User Manual

Fitting Summary Data Sheet

ASTM A 234

Scope

This standard covers wrought carbon steel fittings of
seamless and welded construction which are manufac­tured to the dimensional specifications of ASME
B16.9 and B16.28. These fittings are primarily for use
in pressure piping and in pressure vessel fabrication
for service at moderate and elevated temperatures.

Manufacture

Forging or shaping operations are performed by ham­mering, pressing, piercing, extruding, upsetting,
rolling, bending, machining, or by a combination of
two or more of these operations. The forming process
shall be applied so that it will not produce injurious
imperfections in the fittings.

Hea

t Treatment

Hot-f

ormed WPB fittings, upon which the final form­ing operation is completed at a temperature above
1150ºF and below 1800ºF, need not be heat treated.
Cold-F

ormed WPB fittings, upon which the final
forming operation is completed at a temperature
below 1150ºF, shall be normalized, or shall be stress
relieved at 1100ºF to 1275ºF.

Certifica

tion

When requested by the purchaser, the manufacturer shall
provide a certificate of compliance to this specification.
If requested to provide test reports, the manufacturer
shall also provide the following where applicable:
* Chemical analysis results. When the amount of an ele­ment is less than .02%, the analysis for that element is
reported as “<0.02%.”
* Tensile property results, report the yield strength and
ultimate strength in ksi [or MPa] and elongation in per­cent,
* Hardness acceptable in accordance with Section 10 of
ASTM A-234,
* Seamless or Welded,
* Type of Heat Treatment, if any,
* Starting material, specifically pipe, plate, etc.,
* Statement regarding radiographic or ultrasonic exami­nation.
* Any supplemental testing required by the purchase
order.

Product Marking

All fittings shall have the prescribed information
stamped or otherwise suitable marked on each fitting
in accordance with ASTM A 234/MSS SP-25. A
Weldbend fitting is marked as follows:
Weldbend’s Name, Nominal Pipe Size, Pipe Wall
Thickness Designation, Material Grade (WPB/WPC)
and Heat Identification Number.

Dimensions

Butt-welding fittings and butt-welding short radius
elbows and returns purchased in accordance with this
specification shall conform to the dimensions and tol­erances given in the latest revision of ANSI B16.9 and
B16.28, respectively.

Materials

The starting material for fittings shall consist of killed
steel, forgings, bars, plates, seamless or fusion-welded
tubular products with filler metal added and shall con­form to the the chemical requirements of ASTM A

234. Unless otherwise specified, carbon steel plates
may be either coarse grain or fine grain practice.

E

ven with all the advances in technology today,
the wholly welded piping system has for

decades remained the best choice for use in
high pressure and high temperature application.
Many piping jobs in schools, industrial plants, refiner­ies and factories have benefited from the inherent
advantages of a completely welded system. It
becomes a closed container joining pipes, valves, fit­tings, and flanges. A welded joint actually becomes
part of the pipe, minimizing leak potential

. This pro­vides greater margins of safety, especially under con­ditions of high internal pressures. Additionally, weld­ing fittings form a continuous metal structure with the
pipe, adding forged-in strength to any piping system.
Furthermore, smooth forged fittings simplify insula­tion and take up less space.

Mechanical requirements:

Tensile Strength 60,000-85,000 psi
Yield Strength (min) 35,000 psi
Elongation - Longitudinal: 22%

- Transverse: 14%

Chemical requirements (in %):

Carbon Mang

anese Phosphorus (max) Sulfur (max)

.30 max .29-1.06 .050 .058

Silicon

Chr

omium Molybden

um Nickel Copper

.10 min .40 max .15 max .40 max .40 max

Vanadium Columbium
.08 max .02 max

Note: All information contained in this document, and for a complete description of all require­ments, refer to ASTM A 105. Sheets are subject to change without notice.