Elbows 90 degrees
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Stainless steel seamless elbow 90° 1,5D DN90 OD 101.6 mm x 5.74 mm duplex UNSS31803 / 32205 / 1.4462
Stainless steel seamless elbow 90° 1,5D DN90 OD 101.6 mm x 3.05 mm duplex UNSS31803 / 32205 / 1.4462
Elbows 90 degrees
What are 90-degree stainless steel elbows?
90-degree stainless steel elbows (also written as 90° elbows or 90 deg elbows) are pipe fittings that change the direction of a pipe run by a right angle. They are basic elements in plumbing and industrial piping systems used to redirect liquids, gases or steam where a sharp turn is required. Available as seamless or welded fittings, they come in short-radius (SR, typically 1D) and long-radius (LR, typically 1.5D) versions depending on the required flow characteristics and space constraints.
Materials and common grades
In this shop we sell elbows made only from stainless steels - including standard stainless, acid-resistant and heat-resistant grades. Common grades you will encounter are:
- AISI/EN 304 (EN 1.4301) – general-purpose austenitic stainless steel suitable for many plumbing and food-contact applications.
- AISI/EN 316 / 316L (EN 1.4401 / 1.4404) – molybdenum-bearing austenitic grade offering improved corrosion resistance, widely used in chemical, marine and offshore environments.
- AISI/EN 321 (EN 1.4541) and AISI/EN 310 (EN 1.4845) – examples of heat-resistant stainless grades used where higher service temperatures are expected.
- Ferritic grades (for example EN 1.4016 / AISI 430) – used where magnetic properties or specific corrosion/temperature behaviour is required.
Finishes commonly offered include mill finish, polished (mechanical polish) and pickled & passivated. Pickling and passivation remove surface impurities and help restore the passive chromium oxide layer that protects stainless steel from corrosion.
Types, connections and standards
90-degree elbows are available in a range of connection types to suit different installation methods:
- Butt-weld (buttwelding) elbows - joined by welding; commonly manufactured to standards such as EN 10253 (Europe) and ASME/ANSI B16.9 (US).
- Socket-weld and threaded elbows - for smaller diameters where welding or screw connections are preferred. Threaded fittings in the UK commonly use BSP (BSPT/BSPP); in US markets NPT is standard.
- Long radius (LR) and short radius (SR) - LR elbows give lower pressure loss and reduced turbulence compared with SR elbows but require more space.
Typical sizing references include nominal diameters (DN) used in Europe and inch-based pipe sizes used in the US; we offer elbows in both metric and imperial sizing ranges.
Applications and industries
90-degree elbows are used across many sectors, from DIY and small garage projects to heavy industry. Typical applications include:
- Plumbing and HVAC - changing pipe direction in water, heating and ventilation systems.
- Food & beverage and pharmaceutical - where sanitary stainless grades and polished finishes are required.
- Chemical and process industries - using 316/316L for resistance to corrosive media.
- Oil, gas and offshore - where corrosion resistance and compliance with industry standards are critical.
- Marine and shipbuilding - for seawater systems and deck services.
- Automotive and manufacturing - for exhaust systems, process lines and cooling circuits.
- Construction and architectural applications - stainless fittings for visible, durable installations.
Performance, flow and installation considerations
A 90-degree turn introduces pressure loss and some turbulence compared with straight pipe. Choosing a long-radius elbow (1.5D) reduces pressure drop and turbulence compared to a short-radius (1D). For high-flow or low-pressure-drop systems consider mitred bends or multiple gradual bends where space allows.
Installation notes:
- Butt-weld elbows are welded into the run and require appropriate welding procedure specifications for the chosen grade.
- Threaded elbows are quicker to fit but are typically used on smaller diameters and lower-pressure systems; ensure correct thread type (BSP vs NPT) and use suitable sealants or jointing compounds.
- When insulating pipework, allow for the elbow profile - insulation thickness and cladding details differ at bends; duct wrapping or pre-formed insulation segments are commonly used.
How to choose the right 90 degree elbow
To select the correct elbow consider:
- Material/grade: match corrosion and temperature requirements (for example, 316/316L in marine or aggressive chemical environments; 310/321 for elevated temperatures).
- Connection type: butt-weld for permanent high-integrity joints, threaded/socket for smaller or serviceable connections.
- Radius: LR for lower pressure loss, SR to save space.
- Standards and certification: check whether your project requires fittings to EN, ASME or other industry standards and whether traceability and material certificates are needed.
If you need help specifying the right product for a particular application - from a simple garden water feed to an offshore process line - our team can advise on suitable grades, sizes and connection types to meet regulatory and operational needs.
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