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Reducing Elbow

Reducing Elbow

Reducing Elbow For Corrosion-resistant Piping Solutions

A Reducer Elbow is a fitting used to join two different sizes of pipe.

Reducing Elbow Stainless reducing elbow ASME B16.9 Reducing elbow Boiler Pipeline Protection +4 More

Reducing Elbow

Reducing Elbow For Corrosion-resistant Piping Solutions

A Reducer Elbow is a fitting used to join two different sizes of pipe. Reducer elbows are so named because they look like a reducer and an elbow in one. Reducing elbows have different sized openings at each end so they can connect two different sizes of pipe.

Reducing Elbow Stainless reducing elbow ASME B16.9 Reducing elbow Boiler Pipeline Protection +4 More
Reducing Elbow
Stainless reducing elbow
ASME B16.9 Reducing elbow
Boiler Pipeline Protection

Seamless Alloy Steel Reducing Elbows for Versatile Industrial Piping

Reducing Elbow fittings are critical for industrial piping systems, designed to connect pipes of different diameters while changing flow direction, typically at 90° or 45°. Compliant with ASME B16.9 standards, our seamless alloy steel reducing elbows provide corrosion resistance and erosion resistance, making them ideal for boiler pipeline protection in refineries, petrochemical plants, and power generation facilities.

Manufactured through hot-rolling, cold-drawing, or extrusion, these seamless alloy elbows are heat-treated to enhance mechanical properties. With high chromium (4.00-6.00%) and molybdenum (0.45-0.65%) content, they offer superior resistance to oxidation and wear from corrosive fluids, gases, and abrasive slurries. Available in long-radius (LR, R=1.5D) and short-radius (SR, R=1D) configurations, reducing elbows cater to both high-flow and space-constrained applications.

Our reducing elbows support welding, bending, and flanging, with recommended preheating (150-200°C) and post-weld heat treatment (650-700°C) to ensure weld integrity. Available in sizes from 1/2” to 24” (DN15 to DN600) and wall thicknesses from SCH 40 to SCH 160, they accommodate varying pipe diameters. Rigorous testing, including tensile, flattening, and hydrostatic tests, ensures reliability in conditions up to 650°C.

Enhanced with coatings like 3LPE or FBE, these elbows provide exceptional corrosion resistance, suitable for oil and gas pipelines, chemical processing, and pneumatic conveying systems. Their ability to connect pipes of different sizes makes them versatile for complex industrial piping layouts, ensuring smooth transitions and durability.

For engineers seeking versatile boiler pipeline protection, our reducing elbows deliver strength, safety, and longevity, addressing challenges like pipeline corrosion, thermal stress, and diameter transitions in demanding systems.

NPS Outside Diameter
at bevel		 Center
to End
A
Large
End		 Small
End
4 - 3 114,3 88,9 152
4 - 2.1/2 114,3 73 152
4 - 2 114,3 60,3 152
5 - 4 141,3 114,3 190
5 - 3.1/2 141,3 101,6 190
5 - 3 141,3 88,9 190
5 - 2.1/2 141,3 73 190
6 - 5 168,3 141,3 229
6 - 4 168,3 114,3 229
6 - 3.1/2 168,3 101,6 229
6 - 3 168,3 88,9 229
8 - 6 219,1 168,3 305
8 - 5 219,1 141,3 305
8 - 4 219,1 114,3 305
10 - 8 273 219,1 381
10 - 6 273 168,3 381
10 - 5 273 141,3 381
12 - 10 323,8 273 457
12 - 8 323,8 219,1 457
12 - 6 323,8 168,3 457
14 - 12 355,6 323,8 533
14 - 10 355,6 273 533
14 - 8 355,6 219,1 533
16 - 14 406,4 355,6 610
16 - 12 406,4 323,8 610
16 - 10 406,4 273 610
18 - 16 457 406,4 686
18 - 14 457 355,6 686
18 - 12 457 323,8 686
18 - 10 457 273 686
20 - 18 508 457 762
20 - 16 508 406,4 762
20 - 14 508 355,6 762
20 - 12 508 323,8 762
20 - 10 508 273 762
24 - 22 610 559 914
24 - 20 610 508 914
24 - 18 610 457 914
24 - 16 610 406,4 914
24 - 14 610 355,6 914
24 - 12 610 323,8 914
Comparison of Reducing Alloy Elbow with Other Fittings
Feature Reducing Alloy Elbow LR Alloy Elbow SR Alloy Elbow
Material Type Ferritic Alloy Steel Ferritic Alloy Steel Ferritic Alloy Steel
Bending Radius 1.5D or 1D 1.5D 1D
Pipe Diameter Connects Different Sizes Same Size Same Size
Temperature Range High (up to 650°C) High (up to 650°C) High (up to 650°C)
Corrosion Resistance Excellent (High Cr/Mo) Excellent (High Cr/Mo) Excellent (High Cr/Mo)
Erosion Resistance Excellent Excellent Good
Applications Boilers, Petrochemical, Size Transitions Boilers, Petrochemical Tight Spaces, Low Pressure
Key Advantage Connects different pipe sizes Smooth flow Compact design
.

Key Features

Non-toxic & hygienic
High temperature resistance
High pressure resistance
Leak-proof welding connection
Excellent heat insulation
Lightweight & easy handling
Smooth flow, low pressure loss
Low noise
Corrosion & chemical resistance

Key Benefits

Corrosion Resistance

High chromium content ensures protection against rust and corrosive fluids.

Erosion Resistance

Durable alloy steel withstands wear from abrasive slurries.

Boiler Pipeline Protection

Ideal for high-temperature boiler systems and industrial applications.

Weldability

Supports welding and bending for flexible pipeline configurations.

Cost-Effective

Reduces material costs by connecting different pipe sizes.

Versatile Sizing

Connects pipes of different diameters for complex layouts.

Types of Reducing Elbows

90° Reducing Elbow

Standard right-angle connection with diameter reduction.

45° Reducing Elbow

Gentle angle for smoother directional change.

135° Reducing Elbow

Used for special piping layouts requiring wide angle bends.

180° Reducing Elbow

U-bend with size reduction for return piping systems.

You Can Also Search Reducing Elbows by

A curated list of long-tail keywords for reducing alloy elbows, covering specifications, applications, and material properties.

Standards and Specifications
  • • ASME B16.9 reducing elbow standards
  • • Reducing elbow corrosion resistance specs
  • • Seamless alloy reducing elbow ASME B16.9 properties
  • • Industrial piping reducing elbow standards
Applications
  • • Reducing elbows for boiler pipeline protection
  • • Seamless reducing elbows for petrochemical industry
  • • Industrial piping reducing elbows for oil and gas
  • • Reducing elbows for power plants
  • • Corrosion-resistant reducing elbows for chemical processing
Material and Grades
  • • Seamless alloy reducing elbow material
  • • Corrosion-resistant reducing elbow alloy grades
  • • High-temperature reducing elbow properties
Manufacturing and Testing
  • • Reducing elbow manufacturing process
  • • Reducing elbow non-destructive testing
  • • Corrosion-resistant reducing elbow heat treatment
  • • Industrial piping reducing elbow quality testing
Procurement and Suppliers
  • • Reducing elbow suppliers
  • • Boiler pipeline protection reducing elbow distributors
  • • Corrosion-resistant reducing elbow price
Dimensions and Customization
  • • Reducing elbow dimensions
  • • Industrial piping reducing elbow tolerances
  • • Custom seamless reducing elbow sizes

Note: ASME B16.9 covers reducing alloy elbows for corrosion-resistant applications connecting different pipe sizes. Contact a certified supplier for detailed specifications.

FAQ

A reducing elbow is a pipe fitting that connects pipes of different diameters while changing flow direction, typically at 90° or 45°. Made from seamless alloy steel, it offers corrosion resistance for boiler pipeline protection in industrial piping.

A reducing elbow connects pipes of different diameters, unlike LR (R=1.5D) and SR (R=1D) elbows, which connect same-sized pipes. Reducing elbows can be LR or SR, balancing flow efficiency or compactness for industrial piping systems.

Reducing elbows are commonly available in 90° and 45° angles, with 60° and 120° options for specialized industrial piping systems, ensuring flexibility in flow direction and diameter transitions.

A 5D elbow has a bending radius five times the pipe diameter, offering minimal flow resistance and erosion resistance for abrasive materials. Reducing elbows, with LR (1.5D) or SR (1D) radii, connect different pipe sizes, prioritizing versatility in industrial piping.

Reducing elbows are made from: - Alloy Steel: ASTM A234 WP5, WP9, WP11 for boiler pipeline protection.
- Stainless Steel: ASTM A403 WP 304, 316 for corrosion resistance.
- Carbon Steel: ASTM A234 WPB for cost-effective strength.
- Duplex Steel and Nickel Alloys for extreme conditions.

Reducing elbows are produced via hot-rolling, cold-drawing, or extrusion, followed by heat treatments like normalizing or quenching to ensure corrosion resistance and strength for industrial piping.

Quality is ensured through: - Back Arc Thickness: Measured with a thickness gauge to detect thinning (typically 2mm less than the mouth).
- Dimensional Checks: Inner/outer diameters and center height for both pipe sizes.
- Radiographic Inspection: Detects defects like pores or slag inclusions.
- Testing: Tensile, flattening, and hydrostatic tests per ASME B16.9.

Reducing elbows connect pipes of different diameters, offering versatility for complex industrial piping layouts. Available in LR (R=1.5D) or SR (R=1D) configurations, they balance flow efficiency and compactness while maintaining corrosion resistance.

Coatings include: - Light oiling
- Black painting
- FBE coating
- 2/3-layer PE coating
- Hot-dip galvanizing
These enhance corrosion resistance for boiler pipeline protection.

Calculate the back arc length: L = D * 3.14 (D = larger pipe diameter). For carbon steel: Weight (kg) = (D * a * 0.02466 * L) / 1000, where a is wall thickness. For stainless steel, use 0.02491. This approximates weight for industrial piping, with adjustments for varying diameters.

Types of Reducing Elbow Based on Connection with Pipe

Butt Welded Elbow

Formed by hot pressing or forging, directly welded to pipe with beveled ends for full penetration weld. Suitable for high pressure & high temperature pipelines.

Socket Welded Elbow

Features a socket at the end where the pipe is inserted before welding. The actual end diameter is slightly larger than pipe OD for proper fit.

Threaded Elbow

Similar to socket weld elbows but with threads inside for easy installation & removal. Ideal for repair and maintenance work in low/medium pressure pipelines.

Types of Reducing Elbow Based on Material of Construction

Stainless Steel

ASTM A403 WP Gr. 304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L

Carbon Steel

ASTM A234 WPB, WPBW, WPHY 42, 46, 52, 60, 65, 70

Low Temp Carbon Steel

ASTM A420 WPL3, A420 WPL6

Alloy Steel

ASTM / ASME A/SA 234 Gr. WP 1, 5, 9, 11, 12, 22, 91

Duplex Steel

ASTM A815 / ASME SA815, UNS S31803, S32205, Werkstoff No. 1.4462

Nickel Alloy

ASTM / ASME SB336: UNS 2200 (Nickel 200), 2201 (Nickel 201), 4400 (Monel 400), 8020 (Alloy 20), 8825 (Inconel 825), 6600 (Inconel 600), 6601 (Inconel 601), 6625 (Inconel 625), 10276 (Hastelloy C276)

Pipe Fitting Standards & Dimensions

Pipe fitting dimensions are in either metric or Standard English. Common fittings include 90° long radius, 45° elbows, and 180° return bends. LR and SR elbows are widely used in heating and cooling units.

  • B16.1 – Cast Iron Pipe Flanges and Flanged Fittings
  • B16.3 – Malleable Iron Threaded Fittings
  • B16.5 – Pipe Flanges and Flanged Fittings
  • B16.11 – Forged Steel Fittings, Socket-Welding and Threaded
  • B16.25 – Buttwelding Ends
  • B16.36 – Orifice Flanges

  • ASTM A105 – Carbon Steel Forgings for Piping Applications
  • ASTM A234 – Piping Fittings of Wrought Carbon Steel & Alloy Steel
  • ASTM A403 – Wrought Austenitic Stainless Steel Fittings
  • ASTM A420 – Low-Temperature Service Fittings

  • AWWA C110 – Ductile-Iron and Gray-Iron Fittings
  • AWWA C208 – Fabricated Steel Water Pipe Fittings

  • MSS SP-43 – Wrought Stainless Steel Butt-Welding Fittings
  • MSS SP-75 – High Test Wrought Buttwelding Fittings
  • MSS SP-83 – Steel Pipe Unions, Socket-Welding and Threaded
  • MSS SP-97 – Reinforced Forged Branch Outlet Fittings

  • BSP – British Standard Pipe (BSPT & BSPP threads)
  • JIS – Japanese Industrial Standards
  • NPT – National Pipe Thread (U.S. standard tapered & straight)
  • ISO – International Organization for Standardization
  • ANSI – Assigns schedule numbers & wall thickness classification
Codes

Define requirements for design, fabrication, materials, tests, and inspection of piping systems.

Standards

Provide design and construction rules for pipe fittings, adapters, flanges, sleeves, elbows, tees, valves, etc.

Factors Affecting Standards
  • Pressure-temperature ratings
  • Size & Dimensions
  • Design & Tolerances
  • Materials & Coatings
  • End connections & Threading
  • Marking & Pattern taper
Bolts & Nuts for Flanges
  • A193 – Alloy & stainless steel bolting for high temperature/pressure
  • A320 – Alloy & stainless bolting for low temperature service
  • A194 – Standard for nuts in multiple material types
  • AN – U.S. Army-Navy standard fittings (measured in 1/16″ increments)
  • Dash Size – Inside diameter reference, e.g., “-8” = AN 8 fitting

Materials & Standards

Common Materials
Carbon Steel A234 WPB (A & C available)
High Yield Carbon Enhanced strength properties
Stainless Steel 304, 316 (SCH 10 common)
Nickel Alloys Specialized applications
Standards & Specifications
ASME B16.9 Factory-Made Wrought Steel
ASME B16.28 Short Radius Elbows
ASME B16.25 Buttwelding Ends
MSS SP-97 Welding End Standards
Butt Weld Pipe Fitting Bevel Overview

Plain Bevel and Compound Bevel

Bevel of

Butt Weld Pipe Fitting

All welded pipe fittings have beveled ends to allow for ease of welding. This bevel allows for full penetration weld in most cases.

Welding Bevel acc. to

  • ASME B16.9, Factory-Made Wrought Steel Buttwelding Fittings
  • ASME B16.28, Buttwelding Short Radius Elbows and Returns
  • ANSI/ASME B16.25, Buttwelding Ends
  • MSS SP-97, Socket Welding, Threaded, and Buttwelding Ends

Butt weld pipe fitting bevels provide reliable, high-strength connections for demanding industrial piping applications.

Wide variety for all areas of application Across DIN, EN, and ASME Standards (For Pipes/Fittings/Flanges)
DIN Standard
German Industrial Standard 		EN Standard
European Norm (CEN) 		ASME Standard
American Society of Mechanical Engineers
Low-Carbon & Low-Temp Steel
  • • St 35.8 I / III
  • • St 35 N
  • • St 52.0 / 52.4
 Low-Carbon & Low-Temp Steel
  • • P235GH-TC1 / TC2
  • • P215NL / P265NL
  • • P355N / NL1 / NH
 Low-Carbon & Low-Temp Steel
  • • WPB (ASTM A234, general use)
  • • WPL3 / WPL6 (ASTM A420, low-temp)
Low-Alloy High-Strength Steel
  • • (No direct grade, referenced to EN)
 Low-Alloy High-Strength Steel
  • • L360NB / L360NE (API 5L, pipeline steel)
 Low-Alloy High-Strength Steel
  • • WPHY 52 (API 5L, high-pressure transmission)
Molybdenum Steel (High-Temp)
  • • 15 Mo 3
 Molybdenum Steel (High-Temp)
  • • 16Mo3 (EN 10028, ≤530°C service)
 Molybdenum Steel (High-Temp)
  • • (No direct equivalent; referenced to WP11)
Cr-Mo Steel (Medium Cr Content)
  • • 13 CrMo 4 4
  • • 10 CrMo 9 10
 Cr-Mo Steel (Medium Cr Content)
  • • 13CrMo4-5 (≤540°C service)
  • • 10CrMo9-10 (≤540°C service)
 Cr-Mo Steel (Medium Cr Content)
  • • WP5 / WP9 (ASTM A234, 5%/9% Cr)
  • • WP11 / WP22 (ASTM A234, 1.25%/2.25% Cr)
High Cr-Mo-V Steel (Super High-Temp)
  • • (No direct grade, referenced to EN)
 High Cr-Mo-V Steel (Super High-Temp)
  • • X10CrMoVNb9-1 (EN 10216-2, ≤600°C service)
 High Cr-Mo-V Steel (Super High-Temp)
  • • WP91 / WP92 (ASTM A335, 9% Cr, ≤650°C service)
Key Notes on Grade Equivalence
  • • Equivalence Logic: Grades are grouped by alloy composition (Cr, Mo, V) and service performance (temp/pressure resistance), not exact "one-to-one" matches—mechanical properties (tensile strength, impact toughness) may vary slightly between standards (e.g., DIN St 35.8 ≈ EN P235GH ≈ ASME WPB, but yield strength differs by ±10 MPa).
  • • Standard Scope: - DIN/EN grades cover European pipes/fittings (EN 10216 for seamless pipes, EN 10028 for plates); - ASME grades (WP-series) are defined in ASTM A234 (fittings), A335 (pipes), A182 (flanges) for American systems.
  • • Application Considerations: For cross-standard projects (e.g., European equipment with American pipes), verify maximum service temperature (e.g., EN 16Mo3 ≈ ASTM WP11, but 16Mo3 is limited to 530°C vs. WP11 to 593°C) and corrosion resistance (e.g., L360NB for oil pipelines vs. WPHY 52 for offshore transmission) to avoid mismatches.
  • • Unmatched Grades: Some grades (e.g., DIN 15 Mo 3) have no direct ASME equivalent—use "reference grades" (e.g., WP11) and consult material test reports (MTRs) to confirm compliance with project requirements.
Reducing Elbow

Industries Using

Reducing Elbow Applications

Reducing Elbow components that are used to connect, join, or adapt different parts of a system, such as pipes, tubes, or hoses. They serve multiple purposes, including:

  • Fitting Connection
  • Directional Changes
  • Size Adaptation
  • Water Treatment
  • Branching
  • Valve and Control
  • Pressure Control
  • System Maintenance
  • Connection to Equipment

The choice of fittings depends on the specific requirements of the system, including factors like the type of fluid or gas, pressure, temperature, and the layout of the piping or tubing system.

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