Welded Carbon Steel Fittings
Carbon steel butt-weld fittings are connection parts such as elbows, tees, reducers, caps and flanges joined to steel pipelines by butt welding or flanges. Being the same material and wall thickness as the pipe, they work as one piece with the line.
They are used in heating and steam lines, fire protection systems, industrial water and process lines and pump and valve connections. Elbows are supplied from 21.3 mm to 273 mm in standard, SCH40 and SCH80 wall thicknesses; flanges from DN15 to DN600 in PN6–PN40 classes.
Main Applications
- Central heating, hot water and steam lines
- Fire protection mains
- Industrial water and cooling lines
- Flanged pump and valve connections
- Compressed air main distribution
- Oil, gas and process plants (with suitably certified parts)
- Boiler room manifolds
Technical Data
| Fitting types | Butt-weld elbow, welded tee, reducing tee, cross, concentric and eccentric reducer, cap, single-end nipple, flange |
|---|---|
| Material | Carbon steel, grade depending on model (confirmed by certificate) |
| Manufacturer standards | DIN, EN, ANSI, JIS (manufacturer information) |
| Manufacturer size range | DN15 – DN4000 (manufacturer information) |
| Elbow sizes | 21.3 × 2.0 mm – 273 × 6.3 mm standard wall; up to 273 × 9.3 mm in SCH40 (product range) |
| Elbow types | 90° and 180°, welded and seamless (product range) |
| Wall thickness | Standard, SCH40, SCH80 (product range) |
| Reducers | Concentric and eccentric, 3/4″ – 12″ × 8″ SCH40 (product range) |
| Flange types | Plate, slip-on, weld neck, blind, threaded, loose (product range) |
| Flange sizes and classes | DN15 – DN600, PN6 / PN16 / PN25 / PN40 (product range) |
| Connection | Butt weld (fittings), bolted flange (flanges) |
| Working pressure | Depending on wall thickness, material and flange class |
Material Options
| Part | Carbon steel | Stainless steel | Note |
|---|---|---|---|
| Elbow, tee, reducer, cap | Carbon steel, grade depending on model | AISI 304 / 316 (stainless butt-weld fittings) | Same grade as the pipe |
| Flange | Carbon steel, grade depending on model | AISI 304 / 316 | PN class must match the mating flange |
| Surface | Black, oiled or painted (depending on model) | Uncoated stainless | Carbon steel painted after installation |
| Wall thickness | Standard, SCH40, SCH80 | Depending on model | Matches the pipe wall |
| Welding | Stick or TIG/MIG welding | Stainless electrode / TIG | According to welding method |
| Suitable media | Heating water, steam, fire water, air | Food, chemicals, seawater | Material chosen for the medium |
Which material? Carbon steel fittings are chosen in the same material and wall thickness as the black steel pipeline. Stainless butt-weld fittings should be preferred for corrosive media, food and marine environments.
Advantages
Connection Integrated with the Line
- Works as one piece with the pipe through butt welding
- No weak point caused by threads
High Pressure and Temperature
- Wall thickness up to SCH40 and SCH80
Wide Size Range
- Fittings from 21.3 mm to 273 mm, flanges up to DN600
Detachable Flanged Joints
- Pumps and valves are separated at flange bolts
Complete Set from One Source
- Elbows, tees, reducers, caps and flanges together
Construction and Design Features
- Weld ends ready for butt welding (bevelled depending on model)
- Welded and seamless elbow options
- Concentric and eccentric reducers for axial or top/bottom-aligned size transitions
- Flange bolt hole pattern according to PN class
- Standard, SCH40 and SCH80 options matching pipe wall thickness
Send the pipe outside diameter, wall thickness (or SCH value), fitting type and DN/PN class for flanges; we will confirm suitable parts from stock.
How to Choose?
- Determine the pipe sizeMeasure the pipe outside diameter (e.g. 60.3 mm) and wall thickness (e.g. 2.9 mm or SCH40).
- Choose the fitting typeUse elbows for direction, tees for branches, reducers for size changes and caps for ends.
- Match the flange classChoose a flange type and class matching the DN and PN of the valve and pump.
- Confirm the materialConfirm the material grade suitable for medium and temperature with the certificate.
Complementary Products
Why ORFA?
Types of Welded Carbon Steel Fittings
Steel Flanges
Steel flanges connect carbon steel pipelines to valves, pumps and other equipment with bolted, removable joints.
Details →
Carbon Steel Eccentric Reducers
Carbon steel eccentric reducers change pipe size on welded lines while keeping one side flat.
Details →
Carbon Steel Butt Weld Caps
Carbon steel butt weld caps are used to close the end of a steel pipe permanently by welding.
Details →
Carbon Steel Butt Weld Tees
Carbon steel butt weld tees split flow in three directions on welded steel pipelines.
Details →
Carbon Steel Concentric Reducers
Carbon steel concentric reducers change pipe size on welded lines along the same centre line.
Details →
Butt Weld Reducing Tees
Butt weld reducing tees are used to take a smaller branch off the main run on welded steel lines.
Details →
Butt Weld Elbows
Butt weld elbows are formed fittings used to change direction on welded steel pipelines.
Details →
Butt Weld Crosses
Butt weld crosses split flow in four directions on welded steel pipelines.
Details →
Single-Side Threaded Nipples
Single-side threaded nipples have one threaded end and one plain end for welding, moving a welded line to a threaded connection.
Details →Other Weld Fittings
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