Socket Weld Union

What are Socket Weld Unions?

A Socket Weld Union is a forged pipe fitting used to join two pipes while allowing future disassembly without cutting. It features two socket weld ends and a threaded center nut, enabling the joint to be opened and reassembled easily—ideal for pipelines that require frequent maintenance, cleaning, or inspection.

Asiad Steel Industries is a leading manufacturer, supplier, and exporter of premium-quality Socket Weld Unions in various sizes, grades, and finishes, offering dependable and easy-to-install piping solutions for diverse industrial applications worldwide.

Key Features

Leak-Proof
Jointing

Durable
Construction

Easy Installation
& Removal

Wide
Compatibility

Corrosion
Resistant

Specifications

Specification Category	Parameter / Feature	Details / Options
Size Range	Nominal Size	½” to 4″ (custom sizes available)
Pressure Ratings	ANSI / ASME Class	Class 150, 300, 600, 900, 1500, 2500
	PN Ratings	PN6, PN10, PN16, PN25, PN40, PN64
Product Types	Socket Weld Union	Standard, Heavy Duty
Material Options	Carbon Steel	ASTM A105, ASTM A350 LF2
	Stainless Steel	ASTM A182 F304, F316, F321
	Alloy Steel	ASTM A182 F5, F9, F11, F22
	Other Alloys	Monel, Inconel, Titanium
Standards & Certifications	ASTM	ASTM A105, ASTM A182
	ASME / ANSI	ASME B16.11, ANSI B16.11
	MSS	MSS SP-79, MSS SP-83
	European Standards	EN 10222, EN 10204
	Certifications	ISO 9001, PED 2014/68/EU, NACE MR0175, CE Marked
Design Features	Wall Thickness	Schedule 40, Schedule 80, Schedule 160
	End Connections	Socket Weld Connection
	Pressure Class	2000#, 3000#, 6000#, 9000#
Tolerance	Thread Tolerance	As per ASME B1.1, ISO 7-1
Coating & Surface Finish	Anti-Corrosion Coating	Zinc Plated, Hot Dip Galvanized, Stainless Steel Finish
Coating & Surface Finish	Surface Finish	Mill Finish, Pickled, Polished, Bead Blasted
Testing & Inspection	Pressure Testing	Hydrostatic, Pneumatic
	Non-Destructive Testing	Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT)
	Destructive Testing	Tensile, Hardness, Impact, Elongation

Dimensions

Nominal Size (NPS)	Outside Diameter (OD)	Wall Thickness (Schedule)	Length (L)	End Connections	Weight per Piece
½”	21.3 mm	Schedule 40, Schedule 80	50 mm	Socket Weld	250g
¾”	26.7 mm	Schedule 40, Schedule 80	55 mm	Socket Weld	300g
1″	33.4 mm	Schedule 40, Schedule 80	70 mm	Socket Weld	450g
1½”	48.3 mm	Schedule 40, Schedule 80	80 mm	Socket Weld	700g
2″	60.3 mm	Schedule 40, Schedule 80	100 mm	Socket Weld	1.0kg
2½”	73.0 mm	Schedule 40, Schedule 80	120 mm	Socket Weld	1.5kg
3″	88.9 mm	Schedule 40, Schedule 80	140 mm	Socket Weld	2.0kg
4″	114.3 mm	Schedule 40, Schedule 80	150 mm	Socket Weld	2.5kg

Mechanical Properties

Property	Value	Unit / Standard
Tensile Strength	485 – 750	MPa (Carbon Steel, Stainless Steel, Alloy Steel)
Yield Strength	170 – 450	MPa
Hardness	120 – 200	HB (Brinell)
Elongation	≥ 20 – 30	%
Density	7.8 – 8.0	g/cm³ (Carbon Steel), 7.9 – 8.0 g/cm³ (Stainless Steel)
Impact Toughness	≥ 27 – 70	J (Charpy, grade-dependent)
Modulus of Elasticity (E)	~200	GPa
Fatigue Strength	250 – 450	MPa
Corrosion Resistance	Good to Excellent (SS > CS > Alloy Steel)	–
Thermal Conductivity	15 – 50	W/m·K
Coefficient of Thermal Expansion	11 – 17 ×10⁻⁶	/°C
Yield Ratio (YS/UTS)	0.40 – 0.65	–
Poisson’s Ratio	0.27 – 0.30	–
Brinell Hardness Range	120 – 200	HB
Surface Finish	Mill Finish, Pickled, Polished, Bead Blasted	–
Welding Type	Socket Weld Connection	–
Operating Temperature Range	-46 to 600	°C (material-dependent)
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500	ASME B16.11

Chemical Composition

Element	SS 304	SS 304L	SS 316	SS 316L
Chromium (Cr)	18.0 – 20.0	18.0 – 20.0	16.0 – 18.0	16.0 – 18.0
Nickel (Ni)	8.0 – 10.5	8.0 – 12.0	10.0 – 14.0	10.0 – 14.0
Carbon (C)	≤ 0.08	≤ 0.03	≤ 0.08	≤ 0.03
Manganese (Mn)	≤ 2.00	≤ 2.00	≤ 2.00	≤ 2.00
Silicon (Si)	≤ 1.00	≤ 1.00	≤ 1.00	≤ 1.00
Phosphorus (P)	≤ 0.045	≤ 0.045	≤ 0.045	≤ 0.045
Sulfur (S)	≤ 0.030	≤ 0.030	≤ 0.030	≤ 0.030
Iron (Fe)	Balance	Balance	Balance	Balance
Molybdenum (Mo)	—	—	2.0 – 3.0	2.0 – 3.0