Alloy 625 (Nickel Alloy 625) pipe fittings are used in high-temperature, high-pressure, and highly corrosive environments. These fittings are made from nickel-based Alloy 625, which offers exceptional corrosion resistance, high strength, and oxidation resistance across a wide range of temperatures.
The material can perform from cryogenic temperatures up to 1093 degrees Celsius temperatures. There are different types of the fittings such as the Alloy 625 Butt weld Elbow which is used to turn the direction of the line. The elbows come in different angles such as 45 degrees and 90 degrees. The high temperature operation of the material comes from its high melting point of 1350 degrees Celsius.
Is Inconel the same as Alloy 625?
Yes, “Alloy 625” and “Inconel 625” refer to the same nickel-chromium-molybdenum alloy, Inconel is a trademarked name for a family of nickel-based superalloys developed by Special Metals Corporation. Alloy 625 is one of the alloys within the Inconel family and is commonly referred to as Inconel 625.
Trade Name vs. Generic Name:
Inconel is a registered trademark of Special Metals Corporation for a specific group of nickel alloys.
Alloy 625 as the Generic Term:
Because of the trademark, the industry often refers to this specific alloy as simply “Alloy 625,” especially when produced by companies other than Special Metals.
Composition:
Alloy 625, also known as Inconel 625, is a nickel-chromium-molybdenum alloy known for its high strength, resistance to corrosion and oxidation, and ability to handle a wide range of temperatures.
UNS Designation:
It is also identified by the universal designation UNS N06625.
Inconel Alloy 625 Butt weld Pipe Fittings Specification
| Specifications | ASTM B366 / ASME SB366 |
| Size | Seamless Butt Weld Fittings: 1/2″ – 10″, Welded Butt Weld Fittings: 1/2″ – 48″ |
| Standards | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Thickness | 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS available with NACE MR 01-75 |
| Type | Seamless / Welded / Fabricated |
Alloy 625 UNS N06625 Single Ferrule Fittings Mechanical Properties
| DENSITY | MELTING RANGE | TENSILE STRESS | YIELD STRESS (0.2%OFFSET) | ELONGATION |
| 8.4 g/cm3 | 1350 °C (2460 °F) | Psi – 1,35,000 , MPa -930 | Psi – 75,000 , MPa – 517 | 42.50% |
Nickel Alloy 625 UNS N06625 Fittings Chemical Composition
| ALLOY | C | MN | SI | S | AL | TI | FE | NI | CR |
| INCONEL 625 | 0.10 max | 0.50 max | 0.50 max | 0.015 max | 0.40 max | 0.40 max | 5.0 max | 58.0 min | 20.0 – 23.0 |
Inconel 625 Butt weld Fittings Equivalent Standard
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST | OR |
| Alloy 625 | N06625 | 2.4856 | NC22DNB4M | NiCr22Mo9Nb | NCF 625 | NA 21 | ХН75МБТЮ | ЭИ602 |
What is the difference between hastelloy C276 and 625 alloy?
Corrosion Resistance:
Hastelloy C-276 is superior in highly acidic, reducing, and aggressive chemical environments.
Alloy 625 is great but performs best in oxidizing environments like seawater and high-temperature exposure.
High-Temperature Performance:
Alloy 625 is better suited for extreme temperatures (up to 1800°F).
Hastelloy C-276 is mostly used for corrosion protection at moderate temperatures (up to 1100°F).
Strength:
Alloy 625 is stronger and better for high-load applications.
Hastelloy C-276 is softer and more ductile, making it easier to weld.
Cost:
Hastelloy C-276 is more expensive due to its higher molybdenum and tungsten content.
Alloy 625 is cheaper but still costly compared to stainless steel.
Applications
| Application | Hastelloy C-276 | Alloy 625 |
| Chemical Processing | ✅ Best choice | ✅ Good, but not as resistant |
| Aerospace (Jet Engines, Turbines) | ❌ Not ideal | ✅ Best choice |
| Seawater/Marine Applications | ✅ Excellent | ✅ Very good |
| Nuclear Reactors | ❌ Less common | ✅ Used frequently |
| Acidic Environments (HCl, H₂SO₄) | ✅ Best choice | ❌ Less resistant |
| High-Temperature Use (Above 1200°F/650°C) | ❌ Not ideal | ✅ Best choice |
Nickel Alloy 625 Pipe Elbow Dimensions Chart
| NPS | Outside diameter D | 45° Long Rad Center to End B | 90° Long Rad Center to End A | 45°3D Center to End B | 90°3D Center to End A |
| 1/2 | 21.03 | 16 | 38 | ||
| 3/4 | 26.07 | 19 | 38 | 24 | 57 |
| 1 | 33.04 | 22 | 38 | 31 | 76 |
| 1 1/4 | 42.02 | 25 | 48 | 39 | 95 |
| 1 1/2 | 48.03 | 29 | 57 | 47 | 114 |
| 2 | 60.03 | 35 | 76 | 63 | 152 |
| 2 1/2 | 73 | 44 | 95 | 79 | 190 |
| 3 | 88.09 | 51 | 114 | 95 | 229 |
| 3 1/2 | 101.06 | 57 | 133 | 111 | 267 |
| 4 | 114.03 | 64 | 152 | 127 | 305 |
| 5 | 141.03 | 79 | 190 | 157 | 381 |
| 6 | 168.03 | 95 | 229 | 189 | 457 |
| 8 | 219.01 | 127 | 305 | 252 | 610 |
| 10 | 273 | 159 | 381 | 316 | 762 |
| 12 | 323.08 | 190 | 457 | 378 | 914 |
| 14 | 355.06 | 222 | 533 | 441 | 1067 |
| 16 | 406.04 | 254 | 610 | 505 | 1219 |
Alloy 625 Butt Weld Fittings Tolerances
| TOLERANCES FOR BW FITTINGS | ||||||||
| Nominal Size | All Fittings | 45°&90° Elbows & Tees, Crosses | 3D Radius Elbows | Returns | ||||
| DN | NPS | OD 3) 4) | ID 3) | A B C M | A B | O | K | U |
| 15-65 | 1/2 -21/2 | +1.6 -0.8 | ± 0.8 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 |
| 80-90 | 3-31/2 | ± 1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 |
| 100 | 4 | ± 1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 |
| 125-200 | 5-8 | +2.4 -1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 |
| 250-450 | 10-18 | +4.0 -3.2 | ± 3.2 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 |
| 500-600 | 20-24 | +6.4 -4.8 | ± 4.8 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 |
| 650-750 | 26-30 | +6.4 -4.8 | ± 4.8 | ± 3 | ± 6 | — | — | — |
| 800-1200 | 32-48 | +6.4 -4.8 | ± 4.8 | ± 5 | ± 6 | — | — | — |
| 1300-1500 | 52-60 | +6.4 -4.8 | ± 4.8 | ± 5 | — | — | — | — |
| 1600-1700 | 64-68 | +6.4 -4.8 | ± 4.8 | ± 5 | — | — | — | — |
| 1800-2000 | 72-80 | +6.4 -4.8 | ± 4.8 | ± 5 | — | — | — | — |
What is the difference between SS316 and Alloy625?
Material Type:
SS316 is a stainless steel (mainly iron-based).
Alloy 625 is a nickel-based superalloy.
Corrosion Resistance:
SS316 has excellent resistance to corrosion, especially in chloride-rich environments, but Alloy 625 outperforms it in more aggressive, extreme conditions like high-temperature and high-pressure environments.
Temperature Resistance:
SS316 can withstand temperatures up to about 870°C (1600°F).
Alloy 625 can endure much higher temperatures, making it suitable for applications in more extreme conditions (up to 980°C or 1800°F).
Strength & Toughness:
Alloy 625 provides better high-temperature strength and toughness, especially in environments that require resistance to thermal cycling, while SS316 is good for general use but doesn’t offer the same level of performance at high temperatures.
Cost:
SS316 is generally less expensive than Alloy 625, which is a more specialized and high-performance material.
Key Differences:
| Feature | Inconel 625 | 316 Stainless Steel |
| Base Metal | Nickel | Iron |
| Strength & Toughness | High strength, toughness, and resistance to creep and fatigue at elevated temperatures | Good strength, toughness, and resistance to corrosion in a variety of environments |
| Corrosion Resistance | Exceptional resistance to pitting, crevice, and stress corrosion cracking, especially in chloride-rich and acidic environments | Good corrosion resistance in various environments, but not as resistant as Inconel 625 to extreme conditions |
| High-Temperature Properties | Excellent resistance to oxidation, carburization, and creep at high temperatures | Good, but not as high as Inconel 625 |
| Composition | Primarily nickel, chromium, molybdenum, and niobium | Primarily iron, chromium, nickel, and molybdenum |
Is alloy better than Aluminium?
Aluminum itself is a metal, but it’s often alloyed with other elements to improve its properties. On the other hand, “alloy” can refer to any metal mixture, including high-performance materials like stainless steel, titanium alloys, or nickel-based superalloys (e.g., Inconel 625, Hastelloy, etc.).
Comparing Aluminum vs. Alloys
| Property | Aluminum | Other Alloys (Steel, Nickel, Titanium, etc.) |
| Weight | Very lightweight (2.7 g/cm³) | Generally heavier (e.g., steel ~7.8 g/cm³, titanium ~4.5 g/cm³) |
| Strength | Good, but weaker than many alloys | Stronger in most cases (e.g., stainless steel, Inconel) |
| Corrosion Resistance | Excellent, but can oxidize | Some alloys (stainless steel, titanium) have better corrosion resistance |
| Temperature Resistance | Limited (melts at ~660°C) | Many alloys withstand much higher temperatures |
| Cost | Generally cheaper | High-performance alloys (Inconel, titanium) are more expensive |
| Machinability | Easy to work with | Depends on the alloy (some are harder to machine) |
When is Aluminum Better?
Lightweight applications → Aircraft, cars, bicycles, aerospace
Good corrosion resistance → Marine parts, outdoor structures
Cost-sensitive applications → Consumer products, packaging
When Are Other Alloys Better?
High-strength applications → Steel for construction, tools, machinery
Extreme heat resistance → Inconel and titanium for jet engines, turbines
Chemical resistance → Hastelloy for harsh chemical environments
Key Features of Alloy 625 Pipe Fittings:
✅ Excellent Corrosion Resistance – Performs well in seawater, acidic, and oxidizing environments.
✅ High-Temperature Strength – Can withstand up to 1800°F (980°C) without losing mechanical integrity.
✅ Resistant to Pitting & Crevice Corrosion – Ideal for marine and chemical processing applications.
✅ Good Weldability – Can be easily welded without risk of sensitization or intergranular corrosion.
✅ High Strength & Toughness – Even at elevated temperatures and extreme conditions.
Applications of Alloy 625 Pipe Fittings
● Aerospace
● Marine & Offshore
● Chemical Processing
● Power Plants
● Heat Exchangers & Boilers
● Petrochemical & Refineries
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
Alloy 625 Pipe Fittings Exported Countries
We Export Alloy 625 Pipe Fittings to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc