Nickel Alloy Forged Socket Weld Fittings

Socket weld forged fittings are pipe fittings where the pipe is inserted into the socket and then connected by fillet welding. Featuring high connection strength, few leakage points, and convenient installation, they are widely used in high-pressure piping systems, chemical plants, power stations, shipbuilding, and military industries. The nickel alloy socket weld forged fittings supplied by Hefei Tailan Metal Co., Ltd. are manufactured from high-quality nickel-based alloy forgings through multiple precision processes including die forging/open die forging, solution heat treatment, machining, drilling, and pickling/passivation. Featuring dense structure, precise socket depth, uniform wall thickness, and excellent corrosion resistance, they are specifically designed for small diameter pipe connections under high pressure, high temperature, and severe corrosion conditions.

Main Product Types:

1. Socket Weld Elbow: 90°, 45° direction change
2. Socket Weld Tee: Equal/reducing, branching or merging
3. Socket Weld Cross: Four-way branching
4. Socket Weld Union: Easy disassembly for maintenance
5. Socket Weld Cap: Closing pipe ends
6. Socket Weld Coupling: Connecting same diameter pipes
7. Socket Weld Half Coupling: Branching from main pipe
8. Socket Weld Reducer: Diameter change

Supply Range

Nominal Diameter (DN/NPS): DN6 – DN100 (1/8 inch – 4 inches); Socket weld fittings typically used for small diameters

Pressure Class: Class 2000, 3000, 6000, 9000 (ASME B16.11)

Fitting Type: Elbow (90°/45°), Tee, Cross, Union, Cap, Coupling, Half Coupling, Reducer

Socket Depth (J): Meeting ASME B16.11 standard requirements

End Type: Socket Weld End

Surface Condition Pickled, Polished optional

Marking Method: Steel stamp marking on fitting surface, conforming to MSS SP-25

Strict Non-Destructive Testing

Every nickel alloy socket weld fitting undergoes rigorous NDT inspection:

1. Penetrant Testing (PT) : Detecting surface-opening defects, conforming to ASTM E165 standard
2. Ultrasonic Testing (UT) : Internal defect inspection for critical service fittings
3. Hardness Testing: Verifying heat treatment effectiveness and mechanical property uniformity

Multiple Pressure Classes Available

1. Class 2000: Suitable for low pressure general purpose
2. Class 3000: Suitable for medium pressure chemical plants
3. Class 6000: Suitable for high pressure demanding conditions
4. Class 9000: Suitable for extra high pressure special applications

Which standard governs which property

Nickel alloy pipe systems are governed by two separate families of
standard, and buyers routinely conflate them. The material
is fixed by an ASME Section II specification; the dimensions
are fixed by an ASME B16 series dimensional standard. A fitting can be
perfectly correct on chemistry and still be wrong on centre-to-end.

ASME SB-366 Scope 1.1 states that wrought welding fittings are those
covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95 and MSS SP-97. That
cross-reference is the authoritative link between the material specification
and the dimensional standard.

Nickel alloy grades supplied against each fitting form

The grades below are those covered by the material specifications we
supply against. Note that not every grade is available in every
form — a grade listed for forgings is not automatically
available as a weld-neck flange, because flange product forms carry their
own material specification.

Verified against ASME BPVC Section II: SB-366 (wrought nickel and nickel
alloy fittings), SB-564 (nickel alloy forgings, scope lists N04400, N06600,
N06625, N10276, N06022, N06200, N08020, N08031), SB-462 (forged nickel alloy
pipe flanges, scope lists N10276, N06022, N06200, N08020, N08031).
Precipitation-hardenable grades such as N07718 (Inconel 718) are
not covered by SB-366 or SB-564; they fall under SB-637.
SA-182 is a low-alloy and stainless steel specification and contains no
nickel alloy grades.

Procurement questions that prevent most fit-up disputes

1. Which specification number is on the purchase order?
   Alloy trade names are ambiguous across suppliers. Inconel 625 can be ordered
   as SB-366 (wrought fitting), SB-564 (forging) or SB-446/SB-444 (bar, pipe).
   The form determines the spec.
2. B16.9 or B16.11?These are not interchangeable.
   B16.9 governs factory-made wrought butt-welding fittings; B16.11 governs
   forged socket-weld and threaded fittings. The end preparation and the
   pressure rating basis differ.
3. What schedule or wall thickness is the mating pipe?
   A B16.9 fitting must be ordered to the same wall thickness as the pipe it
   is welded to. Confirm the pipe standard as well — B36.10M for
   carbon steel, B36.19M for stainless.
4. Which fitting class is required?ASME SB-366 Table 1
   assigns classes to the WP grades. Class selection follows from the design
   pressure and temperature of the line, not from the alloy.
5. Is full traceability required?For pressure-critical
   service, request an EN 10204 3.1 mill test certificate matched to the heat
   number, and PMI on delivery.

For the alloy-specific chemistry and mechanical property tables, see our
grades pages: Inconel 625
butt weld fittings, Monel
400 butt weld fittings,
Hastelloy C-276 butt
weld fittings and
forged nickel
alloy socket weld fittings. For flange standard selection, see
ASME
B16.5 vs B16.47: which flange standard applies.