Carbon Steel Forged Fittings Manufacturer & Exporter

Solitaire Overseas forges carbon steel small bore fittings in ASTM A105 material, machined to ASME B16.11 dimensions for socket weld and threaded connections. Made from solid killed carbon steel billet rather than pipe or plate, these fittings deliver a higher pressure to size ratio than butt weld equivalents, making them the standard choice for instrumentation lines, hydraulic systems and compact high pressure piping. Our forged range covers NPS 1/8 inch to 4 inch across Class 2000, 3000, 6000 and 9000, with full mill test certification and dimensional inspection on every batch.

Need the large bore counterpart for these small bore forged fittings?

See our Carbon Steel Buttweld Fittings range, or reach out for a combined quote covering both.

Chemical Composition, Mechanical Properties and Pressure Class Reference

Specifications Chemical Composition Mechanical Properties Pressure Class Equivalents

Carbon Steel Forged Fittings Specifications

Parameter	Specification
Standard	ASTM A105 (forged carbon steel)
Dimensional Standard	ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97
Size Range	NPS 1/8" to 4"
Pressure Class	2000#, 3000#, 6000#, 9000#
End Connection	Socket weld, threaded (NPT/BSPT)
Manufacturing	Forged from solid bar/billet, machined to size
Heat Treatment	Not mandatory for standard grade; normalizing available on request
Hardness	137 to 197 HB
Certification	Mill Test Certificate EN 10204 3.1, 3.2 on request

Chemical Composition (A105, %)

C max	Mn	P max	S max	Si
0.35	0.60 – 1.05	0.035	0.040	0.10 – 0.35

Mechanical Properties (A105)

Tensile Strength min	Yield Strength min	Elongation min	Hardness
485 MPa (70 ksi)	250 MPa (36 ksi)	22%	137 – 197 HB

Pressure Class Reference

Class	End Type	Approx. Working Pressure (non-shock, ambient)
2000	Threaded	2000 psi
3000	Threaded / Socket Weld	3000 psi
6000	Threaded / Socket Weld	6000 psi
9000	Socket Weld	9000 psi

Approximate International Equivalents

ASTM	EN	JIS
A105	P245GH / P250GH (1.0460), EN 10222-2	G3201 SF440A / SF490A

Applications of Carbon Steel Forged Fittings

Instrumentation and control lines
Hydraulic and pneumatic piping
Small bore high pressure process piping
Utility stations, sampling points and drain/vent connections
Skid mounted equipment piping

Forged vs Butt Weld Fittings - Which to Choose

Forged and butt weld fittings serve different parts of the same piping system. Use this table to pick the right one.

Criteria	Forged Fittings (A105)	Butt Weld Fittings (A234 WPB/WPC)
Typical Size Range	NPS 1/8" to 4"	NPS 1/2" to 48"
Manufacturing Route	Machined from solid forged bar	Shaped from seamless/welded pipe or plate
Joint Type	Socket weld or threaded	Butt weld (full penetration)
Pressure Rating Basis	Class 2000 to 9000	Schedule (wall thickness) based
Typical Use Case	Small bore, high pressure, frequent branch connections	Large bore continuous process and pipeline runs
Learn More	This page	Carbon Steel Buttweld Fittings

Frequently Asked Questions

What is the size limit for carbon steel forged fittings?

ASME B16.11 forged fittings are standardized from NPS 1/8 inch through NPS 4 inch; larger diameters are generally served by butt weld fittings instead.

What is the difference between Class 3000 and Class 6000 forged fittings?

The class number indicates the non-shock working pressure rating at ambient temperature in pounds per square inch; Class 6000 fittings have thicker walls and higher pressure capacity than Class 3000 for the same nominal size.

Are socket weld and threaded fittings available in the same class?

Threaded fittings are produced in Class 2000, 3000 and 6000, while socket weld fittings are produced in Class 3000, 6000 and 9000; Class 2000 socket weld fittings are not standardized under ASME B16.11.

Is heat treatment required for ASTM A105 forged fittings?

Heat treatment is not mandatory for standard A105 fittings, but normalizing (A105N) can be specified where improved grain structure and toughness are required, particularly for larger or higher class components.

Can forged fittings be used for sour or NACE service?

Standard A105 is not automatically NACE compliant; sulfur content control and supplementary testing per NACE MR0175 can be specified separately for sour service applications.

What is the minimum order quantity for carbon steel forged fittings?

MOQs vary by size and class. Share your bill of materials with our sales team for a size wise quotation and lead time.