Buttweld 45° Elbow
BW 45 Degree Elbow: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ
Manufacturers, Suppliers, and Exporters of ASME B16.9 Buttweld 45° Elbows in Seamless & Welded Sch 40 / Sch 80, offering 45° Elbows in Stainless Steel, Alloy Steel, Carbon Steel, and High Nickel Alloys for the USA, UK, and Middle East markets.
Best Export Prices: sales@midlandforgefittings.com
Midland Forge and Fittings Pvt. Ltd. is a trusted manufacturer and supplier of high-quality buttweld 45 degree elbows, designed in compliance with ASME B16.9 standards. These elbows are used to change the direction of flow in piping systems at a 45° angle, ensuring smooth and efficient operation. Available in both seamless and welded types, our 45° elbows are offered in various pressure classes, including Schedule 40 and Schedule 80.
We manufacture 45 degree elbow fittings in a wide range of materials such as stainless steel, carbon steel, alloy steel, and high nickel alloys to meet the specific demands of different industries. With a strong presence in export markets like the USA, UK, UAE, Saudi Arabia, and other Middle East countries, Midland Forge and Fittings is known for delivering precision-engineered products that offer durability, corrosion resistance, and consistent performance across critical applications.
Buttweld 45 degree elbows play a crucial role in piping systems where directional flow change with minimal turbulence is required. These elbows offer a 45° bend, making them ideal for compact piping layouts and systems requiring gradual directional transitions. Commonly used across industries such as oil & gas, chemical processing, power plants, and marine engineering, these fittings ensure leak-proof connections and structural integrity. Available in a wide range of sizes, thicknesses, and materials. Widely preferred for their strength and precision, buttweld 45 degree elbows are essential components for efficient and durable piping solutions in both domestic and international markets.
45 Degree Elbow Specifications, Sizes & Standards
BW 45° Elbow – Materials, Grades & Standards
| Material Category | Grade | Standards (ASTM / ASME) | Typical Use/Application |
|---|---|---|---|
| Stainless Steel | 304 / 304L / 304H | ASTM A403 WP304/304L/304H | General purpose, corrosion resistance |
| 316 / 316L / 316H | ASTM A403 WP316/316L/316H | Marine & chemical applications | |
| 317 / 317L | ASTM A403 WP317/317L | High corrosion resistance | |
| 321 / 321H | ASTM A403 WP321/321H | High temperature, stabilized | |
| 347 / 347H | ASTM A403 WP347/347H | High-temp pressure systems | |
| 904L | ASTM A403 WP904L / B625 | Acid handling, sulfuric environments | |
| 254 SMO | ASTM A403 / B366 | High chloride environments | |
| Carbon Steel | A234 WPB / WPC | ASTM A234 | Pressure piping & general piping systems |
| A420 WPL6 | ASTM A420 | Low temperature services | |
| Alloy Steel | A234 WP1 / WP5 / WP9 | ASTM A234 | High-temp & pressure pipelines |
| A234 WP11 / WP22 | ASTM A234 | Steam lines & refineries | |
| A234 WP91 | ASTM A234 | Power generation, high performance | |
| Duplex Steel | UNS S31803 / S32205 | ASTM A815 / A790 | Corrosion & high strength use |
| Super Duplex Steel | UNS S32750 / S32760 | ASTM A815 / A790 | Offshore, seawater applications |
| Nickel Alloys | Nickel 200 / 201 | ASTM B366 / B162 | Alkali & chemical processing |
| Inconel 600 / 625 / 718 | ASTM B366 | Heat exchangers, aerospace | |
| Incoloy 800 / 825 | ASTM B366 | Petrochemical & chemical processing | |
| Hastelloy C22 / C276 | ASTM B366 | Severe corrosion resistance | |
| Monel 400 / K500 | ASTM B366 | Seawater, chemical industries | |
| Alloy 20 | ASTM B366 | Sulfuric acid services | |
| Nimonic 75 / 80A | ASTM B366 / B637 | High-temp applications | |
| Copper Nickel | Cu-Ni 90/10 / 70/30 | ASTM B466 / B467 | Marine systems, seawater service |
| Titanium | Grade 2 / Grade 5 | ASTM B363 | Lightweight, corrosion resistance |
| Aluminium | 6061 / 5083 | ASTM B361 | Low-pressure, non-corrosive piping |
Types of ASME B16.9 Buttweld 45° Elbow
Dimensions of 45 Degree Elbow
| Nominal Pipe Size (NPS) | Outside Diameter (OD) | Center to End (A) |
|---|---|---|
| 1/2″ | 21.3 mm (0.84″) | 16 mm (0.62″) |
| 3/4″ | 26.7 mm (1.05″) | 19 mm (0.75″) |
| 1″ | 33.4 mm (1.31″) | 22 mm (0.88″) |
| 1 1/4″ | 42.2 mm (1.66″) | 25 mm (1.00″) |
| 1 1/2″ | 48.3 mm (1.90″) | 29 mm (1.12″) |
| 2″ | 60.3 mm (2.38″) | 35 mm (1.38″) |
| 2 1/2″ | 73.0 mm (2.88″) | 44 mm (1.75″) |
| 3″ | 88.9 mm (3.50″) | 51 mm (2.00″) |
| 4″ | 114.3 mm (4.50″) | 64 mm (2.50″) |
| 5″ | 141.3 mm (5.56″) | 79 mm (3.12″) |
| 6″ | 168.3 mm (6.63″) | 95 mm (3.75″) |
| 8″ | 219.1 mm (8.63″) | 127 mm (5.00″) |
| 10″ | 273.0 mm (10.75″) | 159 mm (6.25″) |
| 12″ | 323.8 mm (12.75″) | 190 mm (7.50″) |
| 14″ | 355.6 mm (14.00″) | 222 mm (8.75″) |
| 16″ | 406.4 mm (16.00″) | 254 mm (10.00″) |
| 18″ | 457.2 mm (18.00″) | 286 mm (11.25″) |
| 20″ | 508.0 mm (20.00″) | 318 mm (12.50″) |
| 24″ | 609.6 mm (24.00″) | 381 mm (15.00″) |
Weight Chart: ASME B16.9 Buttweld 45 deg Elbow(Carbon Steel, SCH 40 / STD)
| Size (Inches) | 45° Elbow (kg) |
|---|---|
| ½” | 0.08 |
| ¾” | 0.13 |
| 1″ | 0.20 |
| 1½” | 0.45 |
| 2″ | 0.70 |
| 3″ | 1.70 |
| 4″ | 3.00 |
| 6″ | 6.00 |
| 8″ | 10.00 |
| 10″ | 15.50 |
| 12″ | 22.50 |
| 14″ | 30.00 |
| 16″ | 39.00 |
| 18″ | 50.00 |
| 20″ | 62.50 |
| 24″ | 90.00 |
| 26″ | 105.00 |
| 28″ | 120.00 |
| 30″ | 137.50 |
| 32″ | 155.00 |
| 36″ | 190.00 |
| 40″ | 230.00 |
| 42″ | 250.00 |
| 44″ | 270.00 |
| 48″ | 310.00 |
45° Elbow Fitting Tolerances as per ASME B16.9
| Fitting Type | Parameter | Tolerance | |
|---|---|---|---|
| Up to 4” NPS | Above 4” NPS | ||
| 45° Elbows | Outside Diameter at Bevel | ±1.6 mm (1/16″) | ±1.6 mm (1/16″) |
| Center-to-End (A, B) | ±1.6 mm (1/16″) | ±3.2 mm (1/8″) | |
| Wall Thickness | -12.5% (no positive tolerance) | ||
| Ovality | Shall not exceed 1% of specified OD | ||
Why use a 45 degree elbow instead of a 90 degree elbow?
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Reduced Flow Resistance: A 45° elbow changes direction more gradually than a 90° elbow, minimizing turbulence and pressure drop in the piping system.
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Lower Energy Loss: The smoother directional change requires less pumping energy, which improves overall system efficiency, especially in long pipelines.
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Minimized Erosion & Noise: The reduced turbulence helps limit erosion in the pipe walls and lowers vibration or noise levels in the system.
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Better for Sensitive Applications: In chemical, food-grade, or high-purity piping systems, a 45° elbow helps maintain laminar flow and protects product quality.
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Space & Design Considerations: Ideal when a small change in direction is needed without drastically altering the piping layout.
Is there a performance difference between seamless and welded 45° elbows?
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Seamless 45° Elbows: Manufactured from a single piece of metal without any welds, they offer superior mechanical strength, excellent resistance to internal pressure, and uniform grain structure. This makes them ideal for high-pressure, high-temperature, and critical service applications such as oil & gas, petrochemical, and power generation.
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Welded 45° Elbows: Fabricated by welding pieces of steel plate or pipe together, they are more cost-effective and readily available in larger sizes. While they may not match the uniform strength of seamless elbows, they perform reliably in low-to-moderate pressure systems and general industrial use.
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Performance Note: In high-stress environments, the absence of a weld seam in seamless elbows reduces the risk of leakage or failure, whereas welded elbows require strict quality inspection to ensure weld integrity.
How to calculate the center-to-end distance of a 45° elbow if not listed?
- Identify elbow type – This formula applies to long radius (LR) 45° elbows, not short radius types.
- Base formula – The center-to-end distance (A) ≈ 0.625 × Nominal Pipe Size (NPS) in inches.
- Metric conversion – To get millimeters:
A (mm) ≈ 0.625 × NPS × 25.4 - Example – For a 4″ LR 45° elbow:
- A ≈ 0.625 × 4″ = 2.5″
- In mm: 2.5″ × 25.4 = 63.5 mm
- Reference charts – Always verify with ASME B16.9 dimension tables for accuracy, since actual manufacturing tolerances may vary.