Name: Socket Weld 45 Degree Elbow
Brand: Cunimet Alloy International

Socket Weld 45 Degree Elbow – Forged SS 304 316 Duplex Super Duplex

Product Overview

Forged Socket weld 45° Elbow

The Socket Weld 45 Degree Elbow is a forged pipe fitting designed to redirect a piping run by 45 degrees, providing a gentler change of direction than the standard 90-degree elbow. The pipe end is inserted into the fitting socket and secured with a single fillet weld, forming a leak-proof permanent joint suited to high-pressure and high-temperature service.

The 45-degree elbow is preferred in systems where layout constraints require an angular offset or where reducing turbulence and pressure drop at directional changes is important. Cunimet Alloy International manufactures Socket Weld 45° elbows through closed-die forging followed by CNC bore machining to ASME B16.11 socket tolerances. All fittings are 100% dimensionally inspected before dispatch.

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

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ASME Standard B16.11

45° Bend Angle Full Bore

1/8–4" Size Range NPS

3000# Pressure Class Also 6000#

3 Material Grades SS / Duplex / S.Duplex

Technical Dimensions

Socket Weld 45° Elbow — ASME B16.11 Dimensions

All dimensions in millimetres. Dimension “A” = Centre-to-Socket-End measured along the pipe axis. 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	11	11	10.5	9.5
1/4"	13.7	11	11	14.0	11.1
3/8"	17.1	13	13	17.3	12.7
1/2"	21.3	16	16	21.6	15.9
3/4"	26.7	19	22	26.9	19.1
1"	33.4	25	32	33.6	22.2
1-1/4"	42.2	32	35	42.4	25.4
1-1/2"	48.3	38	38	48.5	28.6
2"	60.3	44	48	60.5	31.8
2-1/2"	73.0	51	57	73.2	38.1
3"	88.9	64	70	89.1	44.5
4"	114.3	76	89	114.5	50.8

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

Pressure Classes

3000# vs 6000# — Selection Guide

Class 3000#

Wall equivalent to Schedule 80 (Extra Heavy) pipe. Suitable for standard industrial piping, process lines and instrument tubing systems at moderate to high pressures. The most commonly specified class for general industrial Socket-Weld fittings.

Sch 80 Equivalent General Process Utility Lines

Class 6000#

Wall equivalent to Schedule 160 pipe. Specified for elevated operating pressures, severe-service conditions, offshore systems and project specifications requiring additional pressure safety margin beyond the standard 3000# class.

Sch 160 Equivalent Offshore / Subsea Severe Service

Available Materials

Material Grades for Socket weld 45° Elbows

Grade 01

Stainless Steel 304 / 316

Austenitic stainless steel for a broad range of corrosive process environments. SS 316 provides enhanced resistance to chloride-induced pitting and crevice corrosion, making it the preferred choice in marine and chemical plant service.

ASTM A182 F304 ASTM A182 F316 ASME B16.11

Grade 02

Duplex Steel

Austenitic-ferritic dual-phase alloy with approximately twice the yield strength of standard austenitic stainless steel. Excellent resistance to stress corrosion cracking and pitting in chloride-bearing environments.

ASTM A182 F51 UNS S31803 UNS S32205

Grade 03

Super Duplex Steel

Enhanced duplex alloy with PREN greater than 40 for highly aggressive chloride-bearing service. Preferred for offshore platforms, desalination plants, subsea flowlines and seawater injection systems.

ASTM A182 F53 UNS S32750 UNS S32760

Quality & Compliance

Standards, Testing & Documentation

Applicable Standards

Standard	Description
ASME B16.11	Forged Fittings, Socket-Welding & Threaded — primary dimensional standard
ASTM A182	Material specification for forged alloy and stainless steel fittings
MSS SP-25	Standard marking system for valves, fittings and flanges
MSS SP-55	Quality Standard for Steel Castings & Forgings — visual acceptance criteria
EN 10204	3.1 Mill Test Certificate as standard; 3.2 on request
NACE MR0175	Sour service compliance for Duplex and Super Duplex grades on request

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 Socket Weld 45° Elbows Are Used

01

Piping Layout Offsets

Routing pipes around structural obstructions, equipment bases and cable trays where a 90-degree turn is too sharp and two 45-degree elbows provide a cleaner, lower-pressure-drop solution.

02

Chemical Processing

Corrosive chemical lines, acid dosing systems and solvent transfer piping where angular offsets are required and material selection is critical to service life.

03

Oil & Gas Facilities

Process header connections, wellhead piping manifolds and gas processing skids where compact directional changes at 45 degrees are called for by P&ID requirements.

04

Offshore & Marine

Topsides firewater mains, seawater cooling circuits and ballast piping where 45-degree elbows in Super Duplex Steel provide the necessary resistance to seawater corrosion.

Socket Weld Fittings Range

Socket Weld Elbow 45°