Carbon Steel Elbows Manufacturer

Q: What is a carbon steel elbow used for?

A carbon steel elbow changes the direction of a pipe run, most commonly through a 90° or 45° bend, and is one of the most widely used fittings in any piping system.

Q: What standard governs carbon steel elbow dimensions?

Buttweld carbon steel pipe elbows are dimensioned to ASME B16.9 (long radius) and ASME B16.28 (short radius and 180° returns). Forged socket weld and threaded elbows follow ASME B16.11.

Q: What size range is available for carbon steel elbows?

We supply carbon steel elbows from NPS 1/8 inch through 48 inch, spanning both the forged (small bore) and buttweld (large bore) product families.

Q: What is the difference between a cs elbow and a carbon steel bend?

The terms are often used loosely, but strictly a cs elbow is a standard 45°/90°/180° fitting made to ASME B16.9/B16.28/B16.11 dimensions, while a "bend" (such as a 3D or 5D bend) is pipe cold- or hot-formed to a custom radius, often used where an even gentler direction change is needed than a standard LR elbow provides. Both serve the same basic function of changing flow direction.

Carbon Steel Pipe Elbows Manufacturer and Supplier

Solitaire Overseas manufactures carbon steel elbows for changing pipeline direction, supplied as large bore buttweld elbows dimensioned to ASME B16.9 and ASME B16.28 in ASTM A234 Grade WPB or WPC, and as small bore forged threaded or socket weld elbows dimensioned to ASME B16.11 in ASTM A105. Our carbon steel pipe elbows are available in 90° and 45° bend angles, in long radius (LR) and short radius (SR) patterns, and as 180° return bends. Every cs elbow we ship covers NPS 1/8 inch to 48 inch across both product families, with full mill test certification and dimensional inspection on every batch.

Need small bore forged tees, unions or couplings to complete the routing? See our Carbon Steel Forged Fittings range, or reach out for a combined quote.

What Is a Carbon Steel Elbow?

A carbon steel elbow is a pipe fitting used to change the direction of flow in a piping run, most commonly through a 90° or 45° bend, with 180° return bends used where a line needs to fold back on itself (such as in heat exchanger or coil piping). Elbows are one of the most frequently specified fittings in any pressure piping system, since almost no real pipeline runs in a single straight line from source to destination.

The radius of the bend matters for flow: a long radius (LR) elbow has a centerline radius of 1.5 times the nominal pipe diameter, giving a gentler turn with lower pressure drop and less erosion at the bend. A short radius (SR) elbow has a centerline radius equal to the pipe diameter, taking up less space but creating more turbulence and pressure loss, SR elbows are generally reserved for tight layouts where space, not flow efficiency, is the priority.

Pipe and Elbow Grade Correlation

Buttweld elbows are matched to a specific pipe grade so that fitting and pipe have compatible chemistry and mechanical properties for welding. The table below shows the standard ASTM pairings:

Service	Pipe Grade	Matching Elbow Grade
Standard carbon steel	ASTM A106 Gr. A	ASTM A234 Gr. WPA
Standard carbon steel	ASTM A106 Gr. B	ASTM A234 Gr. WPB
Standard carbon steel	ASTM A106 Gr. C	ASTM A234 Gr. WPC
Low temperature	ASTM A333 Gr. 6	ASTM A420 Gr. WPL6
Low temperature	ASTM A333 Gr. 3	ASTM A420 Gr. WPL3

See our ASTM A234 WPB/WPC/WPA Pipe Fittings and Low Temperature Carbon Steel Fittings pages for grade-specific detail, or our High Yield Carbon Steel Pipe Fittings range for elbows matched to API 5L X-grade pipeline pipe (A860 WPHY 42-70).

Technical Data

SpecificationsChemicalMechanicalDimensionsWeight ChartLR vs SR

Carbon Steel Elbow Specifications

Parameter	Specification
Standard	ASTM A234 Grade WPB / WPC (buttweld); ASTM A105 (forged)
Dimensional Standard	ASME B16.9 (buttweld LR/SR), ASME B16.28 (short radius/returns), ASME B16.11 (forged socket weld/threaded)
Size Range	NPS 1/8" to 48"
Bend Angle	45°, 90°, 180° return
Radius Type	Long radius (1.5D) and short radius (1.0D)
Wall Thickness	SCH 10, SCH 20, SCH 40/STD, SCH 80/XS, SCH 160, XXS
End Type	Beveled (buttweld), socket weld, or threaded (NPT/BSPT)
Construction	Seamless and welded

Elbow wall thickness is matched to the connected pipe schedule. See our SCH 40 Steel Pipe and SCH 80 Steel Pipe pages for matching pipe dimensions and weights. For the full buttweld range beyond elbows, see our Carbon Steel Butt Weld Fittings page.

Chemical Composition of Carbon Steel Pipe Elbows (ASTM A234)

Grade	C max	Mn	P max	S max	Si
WPB	0.30	0.29 – 1.06	0.05	0.058	0.10 min
WPC	0.35	0.29 – 1.06	0.05	0.058	0.10 min

Mechanical Properties of CS Elbow (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)

Carbon Steel Elbow Dimensions (ASME B16.9, mm)

Center-to-end dimensions for 90° and 45° long radius buttweld elbows, common sizes. These are standardized ASME B16.9 figures and apply across grades for a given size.

NPS	OD (mm)	90° LR Center-to-End (mm)	45° LR Center-to-End (mm)
1/2	21.3	38	16
3/4	26.7	38	19
1	33.4	38	22
1 1/4	42.2	48	25
1 1/2	48.3	57	29
2	60.3	76	35
2 1/2	73.0	95	44
3	88.9	114	51
4	114.3	152	64
6	168.3	229	95
8	219.1	305	127
10	273.1	381	159
12	323.9	457	190
16	406.4	610	254
20	508.0	762	318
24	610.0	914	381

Carbon Steel Elbow Weight Chart (kg, by Schedule)

Approximate weights for 90° LR elbows across common schedules. Weight scales with wall thickness (schedule) at a given NPS.

NPS	SCH 10S (kg)	SCH 40S (kg)	SCH 80S (kg)
1/2	0.06	0.08	0.10
3/4	0.07	0.09	0.11
1	0.15	0.18	0.20
1 1/2	0.30	0.40	0.50
2	0.50	0.70	0.90
3	1.30	2.00	2.90
4	2.00	4.00	5.90
6	5.00	10.5	16.0
8	10.0	21.5	33.5
12	27.0	59.0	79.0

Full dimension and weight tables across all sizes, schedules and bend types (including 45° and 180° return) are available as a downloadable spec sheet on request.

Long Radius vs Short Radius Elbows: Which Do You Need?

Feature	Long Radius (LR)	Short Radius (SR)
Centerline Radius	1.5 x NPS	1.0 x NPS
Pressure Drop	Lower	Higher
Space Required	More	Less
Typical Use	Normal process and utility lines, erosive or high-velocity service	Tight layouts, congested skids and packages
Availability	Standard, most widely stocked	Available, less common than LR

Applications of Carbon Steel Pipe Elbows

Changing flow direction on process, utility and pipeline piping
Tight-radius routing on skids, packages and congested plant layouts
Long radius runs on cross-country and plant transmission piping
Heat exchanger, coil and jacketed piping using 180° return bends
Structural, marine and general industrial piping systems

Why Choose Solitaire Overseas for Carbon Steel Pipe Elbows

Two product families under one roof: large-bore buttweld and small-bore forged elbows, so you don't need a second vendor for the small-bore ends of the same line.
Full testing capability: hydrostatic testing, PMI, dye penetrant testing and radiography available in-house or through accredited third-party labs.
Documentation you can audit: EN 10204 3.1 mill test certificates as standard, with 3.2 third-party certification and TPI witness available on request.
Grade flexibility: standard WPB/WPC, low-temperature WPL and high-yield WPHY elbows from the same supplier.

Frequently Asked Questions - Carbon Steel Elbows

What is a carbon steel elbow used for?

A carbon steel elbow changes the direction of a pipe run, most commonly through a 90° or 45° bend, and is one of the most widely used fittings in any piping system.

What is the difference between a long radius and short radius elbow?

A long radius (LR) elbow has a centerline radius of 1.5 times the pipe diameter, giving a gentler bend with lower pressure drop. A short radius (SR) elbow has a centerline radius equal to the pipe diameter, taking up less space but creating more turbulence, SR elbows suit tight layouts, while LR elbows are preferred for normal process and high-velocity service.

What standard governs carbon steel elbow dimensions?

Buttweld carbon steel pipe elbows are dimensioned to ASME B16.9 (long radius) and ASME B16.28 (short radius and 180° returns). Forged socket weld and threaded elbows follow ASME B16.11.

What material grade is used for carbon steel elbows?

Standard buttweld elbows are ASTM A234 Grade WPB or WPC, matched to A106 Grade B or C pipe respectively. Forged socket weld and threaded elbows are ASTM A105. Low-temperature service uses ASTM A420 WPL3/WPL6, and high-yield cross-country pipeline service uses ASTM A860 WPHY 42-70.

Are carbon steel elbows seamless or welded?

Both are available. Seamless construction is generally preferred for smaller bores and higher-integrity or high-pressure service, while larger sizes are commonly fabricated from welded pipe or plate. Specify your preference or let our team match your project standard.

What size range is available for carbon steel elbows?

We supply carbon steel elbows from NPS 1/8 inch through 48 inch, spanning both the forged (small bore) and buttweld (large bore) product families.

What is the difference between a cs elbow and a carbon steel bend?

The terms are often used loosely, but strictly a cs elbow is a standard 45°/90°/180° fitting made to ASME B16.9/B16.28/B16.11 dimensions, while a "bend" (such as a 3D or 5D bend) is pipe cold- or hot-formed to a custom radius, often used where an even gentler direction change is needed than a standard LR elbow provides. Both serve the same basic function of changing flow direction.