Name: Socket Weld 90 Degree Elbow
Brand: Cunimet Alloy International

Socket Weld 90 Degree Elbow – Forged SS 304 316 Duplex Super Duplex

Product Overview

Forged SW 90° Elbow

The Socket Weld 90 Degree Elbow is a forged pipe fitting used to change the direction of a piping run by 90 degrees. The pipe end is inserted into the fitting socket and secured with a fillet weld, creating a permanent, high-integrity joint suitable for high-pressure and high-temperature service.

Cunimet Alloy International manufactures SW 90° elbows through a closed-die forging process, ensuring a dense, homogeneous grain structure with superior mechanical properties over cast alternatives. All elbows are fully machined to ASME B16.11 socket bore tolerances and 100% dimensionally inspected before dispatch.

ASME B16.11 MSS SP-79 1/8" to 4" NPS 3000# • 6000# SW End Both Ends

Request a Quote

ASME Standard B16.11

90° Bend Angle Full Bore

1/8–4" Size Range NPS

3000# Pressure Class Also 6000#

3 Material Grades SS / Duplex / S.Duplex

Technical Dimensions

SW 90° Elbow — ASME B16.11 Dimensions

All dimensions in millimetres (mm) unless stated. Dimension “A” = Centre-to-Socket-End. Socket bore and depth are identical for 3000# and 6000# of the same NPS.

NPS	Pipe O.D. (mm)	Centre-to-End “A” (mm)		Socket Bore (mm)	Socket Depth (mm)
NPS	Pipe O.D. (mm)	Class 3000#	Class 6000#	Socket Bore (mm)	Socket Depth (mm)
1/8"	10.3	16	16	10.5	9.5
1/4"	13.7	16	16	14.0	11.1
3/8"	17.1	20	20	17.3	12.7
1/2"	21.3	25	25	21.6	15.9
3/4"	26.7	29	32	26.9	19.1
1"	33.4	38	44	33.6	22.2
1-1/4"	42.2	48	51	42.4	25.4
1-1/2"	48.3	57	57	48.5	28.6
2"	60.3	64	70	60.5	31.8
2-1/2"	73.0	76	83	73.2	38.1
3"	88.9	95	102	89.1	44.5
4"	114.3	114	127	114.5	50.8

Dimensions are nominal per ASME B16.11 latest edition. Actual dimensions subject to applicable tolerances. All dimensions in millimetres.

Pressure Classes

3000# vs 6000# — What’s the Difference?

Class 3000#

Equivalent to Schedule 80 (Extra Heavy) pipe wall. Suitable for standard high-pressure process piping, utility services and instrument lines. The most widely specified socket weld elbow class for general industrial applications.

Sch 80 Equivalent General Process Instrument Lines

Class 6000#

Equivalent to Schedule 160 pipe wall. Specified for elevated-pressure and elevated-temperature service, offshore and subsea piping systems, and applications where additional safety margins are required by project specification.

Sch 160 Equivalent Offshore / Subsea High-Temperature

Available Materials

Material Grades for SW 90° Elbows

Grade 01

Stainless Steel 304 / 316

Austenitic stainless steel offering excellent corrosion resistance in a wide range of chemical and process environments. SS 316 provides enhanced resistance to chloride pitting and crevice corrosion compared to SS 304.

ASTM A182 F304 ASTM A182 F316 ASME B16.11

Grade 02

Duplex Steel

Dual-phase austenitic-ferritic microstructure delivering approximately twice the strength of standard austenitic stainless steel with excellent resistance to stress corrosion cracking in chloride environments.

ASTM A182 F51 UNS S31803 UNS S32205

Grade 03

Super Duplex Steel

Premium duplex alloy with PREN greater than 40, engineered for the most aggressive chloride-bearing environments including offshore platforms, desalination plants and subsea flowlines.

ASTM A182 F53 UNS S32750 UNS S32760

Quality & Compliance

Standards, Testing & Documentation

Applicable Standards

Standard	Description
ASME B16.11	Forged Fittings, Socket-Welding & Threaded — dimensional standard
ASTM A182	Material specification for forged alloy and stainless fittings
ASME B1.20.1	Pipe threads — not applicable for SW end, for reference only
MSS SP-25	Standard marking system for valves, fittings and flanges
EN 10204	3.1 Mill Test Certificate standard as minimum
NACE MR0175	Sour service compliance available on request (Duplex / Super Duplex)

Quality Tests Performed

Test	Method / Scope
Chemical Analysis	OES per ASTM A182 for each heat of material
Mechanical Testing	Tensile, yield, elongation and Charpy impact (where specified)
Hardness Testing	Brinell or Vickers per ASTM A182 requirements
PMI	100% Positive Material Identification by XRF on request
Dimensional Inspection	100% per ASME B16.11 including socket bore, depth and wall
Visual Inspection	100% per MSS SP-55 acceptance criteria

Applications

Where SW 90° Elbows Are Used

01

Oil & Gas Processing

Wellhead piping, process headers, separator vessels, gas dehydration units and offshore platform topsides where permanent high-pressure direction changes are required.

02

Chemical & Petrochemical

Corrosive process lines, acid handling systems, solvent piping and reactor feed and discharge circuits where material integrity over the full service life is critical.

03

Power Generation

High-pressure steam lines, boiler feed water systems, condensate return piping and auxiliary cooling water circuits in thermal and nuclear power plant installations.

04

Marine & Offshore

Subsea manifolds, topside process piping, ballast and bilge systems, and firewater headers where resistance to seawater corrosion is mandatory.

Socket Weld Fittings Range

Socket Weld Elbow 90°