Carbon Steel Cross Manufacturer & Exporter

Solitaire Overseas manufactures carbon steel crosses for four-way branch connections, supplied as large bore buttweld crosses dimensioned to ASME B16.9 in ASTM A234 Grade WPB or WPC, and as small bore forged threaded or socket weld crosses dimensioned to ASME B16.11 in ASTM A105. A carbon steel cross has one run and two opposed branch outlets at 90 degrees, available as a straight (equal) cross where all four outlets share the same nominal size, or a reducing cross where the branch outlets are smaller than the run. Our carbon steel cross range covers NPS 1/8 inch to 48 inch across both product families, with full mill test certification and dimensional inspection on every batch.

Technical Data

Specifications Chemical Composition (ASTM A234, %) Mechanical Properties (ASTM A234) Chemical Composition (ASTM A105, %) Mechanical Properties (ASTM A105) Equivalent Grades Straight vs Reducing

Carbon Steel Cross Specifications

Parameter	Specification
Standard	ASME B16.9 (buttweld straight/reducing cross, NPS 1/2" - 48"); ASME B16.11 (forged cross, NPS 1/8" - 4")
Material Specification	ASTM A234 Grade WPB / WPC (buttweld); ASTM A105 (forged threaded and socket weld)
Size Range	NPS 1/2" to 48" buttweld; NPS 1/8" to 4" forged threaded/socket weld
Wall Thickness / Class	Any producible wall thickness per ASME B36.10M (buttweld); Class 3000 or 6000 (forged)
End Connection	Butt weld, square or bevel cut (buttweld cross); NPT taper thread or socket weld bore (forged cross)
Manufacturing	Wrought from seamless or welded pipe (buttweld); forged from bar stock (forged)
Fitting Types	Straight (equal) cross, reducing cross
Heat Treatment	Not mandatory for standard hot formed WPB/WPC or as-forged A105; cold formed or NPS 12+ locally heated fittings require it
Certification	Mill Test Certificate EN 10204 3.1, 3.2 on request

Chemical Composition (ASTM A234, %) - Buttweld Grades

Element	WPB max	WPC max
Carbon	0.30 (0.35 bar/plate/forging)	0.35
Manganese	0.29 - 1.06	0.29 - 1.06
Phosphorus max	0.050	0.050
Sulfur max	0.058	0.058
Silicon min	0.10	0.10
Chromium max	0.40	0.40
Molybdenum max	0.15	0.15
Nickel max	0.40	0.40
Copper max	0.40	0.40
Vanadium max	0.08	0.08

Sum of Cu, Ni, Cr and Mo shall not exceed 1.00%. Carbon equivalent (C.E. = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) shall not exceed 0.50 for WPB and WPC, reported on the test report.

Mechanical Properties (ASTM A234)

Grade	Tensile Strength min	Yield Strength min	Elongation min
WPB	415 MPa (60 ksi)	240 MPa (35 ksi)	22% (longitudinal, round specimen)
WPC	485 MPa (70 ksi)	275 MPa (40 ksi)	22% (longitudinal, round specimen)

Chemical Composition (ASTM A105, %) - Forged Grade

Element	A105 max/range
Carbon max	0.35
Manganese	0.60 - 1.05
Phosphorus max	0.035
Sulfur max	0.040
Silicon	0.10 - 0.35
Copper max	0.40
Nickel max	0.40
Chromium max	0.30
Molybdenum max	0.12
Vanadium max	0.08

Sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00%; sum of Cr and Mo shall not exceed 0.32%. A105N denotes the normalized condition, offering improved impact toughness for low-temperature or critical service.

Mechanical Properties (ASTM A105)

Property	Requirement
Tensile Strength min	485 MPa (70 ksi)
Yield Strength min	250 MPa (36 ksi)
Elongation min (2 in.)	22%
Reduction of Area min	30%
Brinell Hardness	137 - 197 HBW

Approximate International Equivalents

ASTM Grade	EN	JIS
A234 WPB	P235GH / P265GH (EN 10253-2)	STPG370
A234 WPC	P280GH (EN 10253-2)	STPG410

ASTM Grade	EN	DIN	JIS
A105	P245GH / P250GH (EN 10222-2)	1.0460	SFVC1 (G3202)

Carbon Steel Cross: Straight vs Reducing

Criteria	Straight Cross	Reducing Cross
Outlet Sizing	Run and both branches are the same NPS	Branch outlets are smaller than the run
Marking	Single NPS designation	Run size x branch size (e.g. 6" x 4")
Typical Use	Symmetrical four-way distribution	Tapping smaller branches off a larger header
Flow Effect	Balanced pressure drop on all outlets	Higher velocity/pressure drop through the reduced branches

Types of Carbon Steel Cross

Straight Cross - run and both branch outlets share the same nominal pipe size.
Reducing Cross - one or both branch outlets are smaller than the run, marked with run and branch sizes.
Forged Threaded Cross (ASME B16.11) - NPT connections, Class 3000, for small bore utility piping.
Forged Socket Weld Cross (ASME B16.11) - socket bore connections, Class 3000, for small bore process piping.

Need buttweld elbows, tees or reducers to complete the manifold? See our Carbon Steel ASME B16.9 Pipe Fittings range, or reach out for a combined quote.

Applications of Carbon Steel Cross

Four-way branch connections on process headers and distribution manifolds
Fire sprinkler and fire water grid piping
Instrumentation and utility manifold connections
Symmetrical branch take-offs in compact skid layouts
Cross connections in cooling water and general industrial piping

Frequently Asked Questions

What is a carbon steel cross used for?

A carbon steel cross provides a four-way branch connection, with one run and two opposed branch outlets at 90 degrees, commonly used in manifolds, fire water grids and symmetrical distribution piping.

What is the difference between a straight cross and a reducing cross?

A straight cross has a run and both branch outlets at the same nominal pipe size, while a reducing cross has branch outlets smaller than the run and is marked with both the run and branch sizes.

What standard governs carbon steel cross dimensions?

ASME B16.9 covers large bore buttweld crosses from NPS 1/2 inch to 48 inch, while ASME B16.11 covers small bore forged threaded and socket weld crosses from NPS 1/8 inch to 4 inch.

What material grade is used for carbon steel crosses?

Buttweld crosses are typically supplied in ASTM A234 Grade WPB, with WPC available for higher strength service. Forged threaded and socket weld crosses use ASTM A105.

Are carbon steel crosses less common than tees?

Yes. Crosses are used less frequently than tees because most piping codes prefer offset tee connections over a true four-way cross for reasons of stress distribution, but crosses remain standard for symmetrical manifold and fire protection piping.

What size range is available for carbon steel crosses?

Buttweld crosses are available from NPS 1/2 inch through NPS 48 inch, while forged threaded and socket weld crosses are available from NPS 1/8 inch through NPS 4 inch.

Get a quote for carbon steel crosses from Solitaire Overseas, or visit our Carbon Steel Pipe Fittings hub to compare crosses against tees and reducer options.