Inconel 625 Pipe
Inconel 625 Pipe is a high end nickel based superalloy piping solution that is known to have great strength and an excellent ability to resist corrosion. This alloy has an extreme environmental capability, and this is attributed to the fact that it is highly tensile and tough in temperatures between 1093degC and 2000degC (cryogenic to 2000 degF). The special alloy formed by nickel, chromium and molybdenum and hardened with niobium helps to avoid age-hardening treatments, and offers a better resistance to oxidation and carburization. It finds extensive use in aerospace, chemical processing as well as marine engineering applications where reliability is highly demanded.
Inconel 625 Pipe Supplier & Manufacturer
Stellar Alloys is among the major producers of high quality Inconel 625 Pipes and Tubes. Inconel 625 Pipe is a Nickel-Chromium-Molybdenum alloy that exhibits great resistance to corrosion in a large variety of corrosive media, and in particular to crevice and corrosion pitting. Sea water applications are a good choice with Inconel 625 Seamless Pipe. Stellar Alloy is the manufacturer of Inconel 625 Welded Pipe and synonymous with UNS N06625, W.NR 2.4856 and AWS 012. SCH40 625 Inconel Pipe has the property of being able to retain its strength under extreme environments. The Inconel Alloy 625 Clad Pipe is good in general production of parts in which designs require high temperature and corrosion resistance and use in turbine, heat exchanger and moulding parts. Inconel 625 Pipe SCH60 Inconel 625 Pipe are commonly used and used in the offshore chemical processing, oil and gas and nuclear industries.
Inconel 625 Tube is suitable for application in extreme temperatures with high strength in areas of oxidation problems and is specifically applied in the offshore oil and gas and aerospace industry. Inconel 625 Seamless Tube is also considered as highly resistant to pitting, stress corrosion, crevice corrosion, corrosion fatigue and erosion corrosion that contributes to the maintenance of its mechanical characteristics up to 450 o C. Cold-drawn tubing is simply an example of Inconel 625 tubing produced under AMS 5581. The cold drawing process is repeated numerous times on all Inconel 625 boiler tubes. The Inconel 625 Tubing comes in various lengths of 6 metre and 3 metre.
Table of Contents
- Inconel 625 Pipe and Tube Specifications
- Types of Inconel 625 Pipe
- Inconel 625 Pipe Price List in India
- Inconel Alloy 625 Pipe Sizes
- ASTM B444 UNS N06625 Pipe Schedule Chart
- ASTM B444 Inconel 625 Pipe Dimensions
- ASTM B444 625 Inconel Pipe Pressure Rating
- Inconel 625 Pipe Weight Chart
- Inconel 625 Tube Chemical Composition
- Inconel 625 Tube Mechanical Properties
- Inconel 625 Pipe Applications and Industries
- Inconel 625 Equivalent Grades and International Standards
- Corrosion Resistance Properties of Inconel 625
- Manufacturing Process of Inconel 625 Seamless Pipe
- Inconel 625 Pipe vs Other Nickel Alloys
- Inconel Pipe Roughness and Surface Finish
- Mill Test Certificates of Inconel 625 Pipe Manufacturer
- Inconel 625 Pipes Test Reports and Inspections
- Frequently Asked Questions About Inconel 625 Pipe
Inconel 625 Pipe & Tube Specifications
Our Inconel 625 Pipe specifications are detailed with a number of international standards which ensure the international compliance. ASTM B444 is a standard primary ASTM specification of cold-worked seamless pipe and tube, ASTM B705 of UNS N06625 welded pipe, ASTM B751 of welded nickel alloy tube, ASTM B775 of welded pipe and tube, ASTM B704 of welded tube and ASTM B829 of seamless tube. ASME counterparts are referred to as ASME SB444, SB705, SB751, SB775, SB704 and SB829. AMS list of material specifications in the Aerospace include AMS 5581 (seamless tubing), AMS 5599 (seamless pipe), and AMS 5666 (welded tube). Others include ISO 6207, DIN 17751 about welded pipes and VdTUV 499 piping material. According to the requirements of the ASTM B444, pipes are supplied in two grades Grade 1 (annealed condition) and Grade 2 (solution annealed condition). We continue with global manufacturing standards which ensures every length is of good quality that can maintain difficult demands of pressure and corrosion prone conditions.
| Parameter | Details |
| Inconel 625 pipe ASTM Specification |
ASTM B 167 ASME SB 167 / ASTM B 829 ASME SB 829 / ASTM B 517 ASME SB 517 ASTM B705 – UNS N06625 Welded Pipe ASTM B444 – UNS N06625 Cold-worked seamless pipe and tube ASTM B474 – Nickel Alloy 625 Electric Fusion Welded Pipe/ EFW Pipe |
| AMS | AMS 5581, AMS 5599, AMS 5666 |
| Manufacturing Type | Seamless / ERW / Welded / Fabricated / CDW / CDS / DOM / CEW / 100% X Ray Welded |
| Thickness Range | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXH, SCH XXS, SCH XS |
| Standard | SUS, JIS, AISI, ASTM, GB, DIN, EN |
| Inconel 625 Pipe annealed Condition Grades |
UNS N06625 cold-worked seamless pipe are furnished in : ASTM B444 grade 1 ASTM B444 grade 2 ASME SB444 GR.1 |
| Value Added Services |
Cutting Beveling Threading Destructive and Non Destructive Ultrasonic Testing Draw & Expansion as per required Size & Length |
| END | Plain End, Beveled End, Treaded Alloy 625 UNS N06625 Pipes |
| Marking |
Specification Material Grade Nominal Size Schedule or Wall Thickness Method of Manufacturing (Seamless / Welded) Heat Number Manufacturer’s Name or Custom Logo – on request Marked Pipe Sample: ASTM B444 UNS N06625 12″ NB SCH 40S SEAMLESS HEAT NO. XXXX |
| Test Certificate |
Manufacturer Test Certificate 100% Radiography Test Report DFARS compliant EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC) Fumigation Certificates Raw Materials Certificate Third Party Inspection Report Moisture testing Heat Treatment Charts Surface roughness measurement HS Code Commercial Invoice Laboratory Test Certificate from Govt. Approved Lab Form A for Generalized System of Preferences (GSP) |
| 625 Inconel Pipe Packaging | Packed in PE Fabric Bundles or ply wooden box wrapped in plastic or Standard seaworthy export packing or as per customers’ request |
| Port | Mumbai, India |
Types of Inconel 625 Pipe
| Preview | Product | Matrials | Grade | Other Types |
 |
Seamless Pipe | Inconel Alloy | Inconel 625, Alloy 625 | ASTM B444 Inconel Alloy 625 Seamless Pipes, UNS N06625 Seamless Inconel Round Pipes |
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Seamless Tube | Inconel Alloy | Inconel 625, Alloy 625 | ASTM B444 Inconel 625 Seamless Tube, Alloy 625 Seamless Tubing |
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Welded Pipe | Inconel Alloy | Inconel 625, Alloy 625 | ASTM B705 Inconel Alloy 625 Welded Pipe, Inconel UNS N06625 Welded Pipes, Inconel 625 ERW Pipes |
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Welded Tube | Inconel Alloy | Inconel 625, Alloy 625 | ASTM B704 Inconel Alloy 625 Welded Tube, Inconel 625 Welded Tubes, Inconel UNS N06625 ERW Tubing |
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Welded Pipe | Inconel Alloy | Inconel 625, Alloy 625 | Inconel 625 EFW Pipe, Alloy UNS N06625 EFW Pipes, Inconel Alloy 625 Electric-Fusion-Welded Pipes |
Inconel 625 Pipe Price List in India
The present Inconel 625 price list of pipes in India indicates market dynamics of the cost of the nickel and molybdenum raw materials. The price is based on the thickness of the wall, schedule and length. We have competitive rates of bulk orders and project-specific orders. It should be noted that prices can change depending on the exchange rates of the metals on a daily basis.
Product Type | Size Range | Standard | Price |
Inconel 625 Seamless Pipe | Small to Medium OD | ASTM B444 / ASME SB444 | |
Inconel 625 Welded Pipe | Medium to Large OD | ASTM B444 / ASME SB444 | |
Alloy 625 ERW Pipe | Project Based Sizes | ASTM B444 | |
Alloy 625 Pipe (Cut Length) | As per Requirement | ASTM B444 |
Inconel Alloy 625 Pipe Sizes
Inconel Alloy 625 pipe sizes are available in seamless and welded configurations. Seamless pipes range from 4mm to 219mm OD with thickness from 0.5mm to 20mm in single random, double random, and cut lengths. Welded UNS N06625 pipes are manufactured from 5.0mm to 1219.2mm OD with similar thickness ranges. Common nominal bore sizes include 1/8″, 1/4″, 3/8″, 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″, 3-1/2″, 4″, 5″, 6″, 8″, 10″, 12″, 14″, 16″, and 18″ NB. Standard lengths are 20 feet (6096mm) and 40 feet (12192mm) with custom cutting services available.
| Wall | Sizes ( O.D.) |
| .010 | 1/16″, 1/8″, 3/16″ |
| .020 | 1/16″, 1/8″, 3/16″, 1/4″, 5/16″, 3/8″ |
| .012 | 1/8″ |
| .016 | 1/8″, 3/16″ |
| .028 | 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 3/4″, 1″, 1 1/2″, 2″ |
| .035 | 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 2″, 2 1/4″ |
| .049 | 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/8″, 1 1/4″, 1 1/2″, 1 5/8″, 2″, 2 1/4″ |
| .065 | 1/4″, 5/16″, 3/8″, 1/2″, 16″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 1 3/4″, 2″, 2 1/2″, 3″ |
| .083 | 1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 1 5/8″, 1 7/8″, 2″, 2 1/2″ ,3″ |
| .095 | 1/2″, 5/8″, 1″, 1 1/4″, 1 1/2″, 2″ |
| .109 | 1/2″, 3/4″, 1″, 1 1/4″, 1 1/2″, 2″ |
| .120 | 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1 1/4″, 1 1/2″, 2″, 2 1/4″, 2 1/2″, 3″ |
| .125 | 3/4″, 1″, 1 1/4″, 1 1/2″, 2″, 3″, 3 1/4″ |
| .134 | 1″ |
| .250 | 3″ |
| .375 | 3 1/2″ |
ASTM B444 N06625 Pipe Schedule Chart
The ASTM B444 N06625 Pipe Schedule Chart provides comprehensive wall thickness specifications for various schedules. Available schedules include SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 120, SCH 160, SCH XXH, and SCH XXS. For example, 1/2″ pipe is available in SCH 5, 10, 40, 80, 160, and XXH; 1″ pipe in SCH 5, 10, 40, 80, 160, and XXH; 2″ pipe in SCH 10, 40, 80, 160, and XXH; 6″ pipe in SCH 5, 10, 40, 80, 120, 160, and XXH. Schedule selection depends on required pressure rating and application environment. Higher schedules indicate thicker walls for increased pressure capacity.
| Schedule Chart | |
| 1/8″ (.405″ O.D.) | 3 1/2″ ( 4.000″ O.D.) |
| SCH 40, 80 | SCH 10, 40, 80, 160, XXH |
| 3/8″ (.675″ O.D.) | 5″ ( 5.563″ O.D.) |
| SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
| 1/2″ (.840″ O.D.) | 6″ (6.625″ O.D.) |
| SCH 5, 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
| 1/4″ (.540″ O.D.) | 4″ (4.500″ O.D.) |
| SCH 10, 40, 80 | SCH 10, 40, 80, 160, XXH |
| 3/4″ (1.050″ O.D.) | 8 ” (8.625″ O.D.) |
| SCH 10, 40, 80, 160, XXH | SCH 5, 10, 40, 80, 120, 160, XXH |
| 1-1/2″ (1.900″ O.D.) | 14″ (14.000″ O.D.) |
| SCH 10, 40, 80, 160, XXH | SCH10 (.188), SCH40 (.375) |
| 2″ (2.375″ O.D.) | 16″ (16.000″ O.D.) |
| SCH 10, 40, 80, 160, XXH | SCH10 (.188), SCH40(.375) |
| 1″ IPS:(1.315′ O.D.) | 10″ (10.750″ O.D.) |
| SCH 5, 10, 40, 80, 160, XXH | SCH 10, 20, 40, 80 (.500), TRUE 80(.500) |
| 1-1/4″ (1.660″ O.D.) | 12″ (12.750″ O.D.) |
| SCH 10, 40, 80, 160, XXH | SCH 10, 20, 40(.375), TRUE40(.406), SCH80(.500) |
| 2 1/2″ (2.875″ O.D.) | 18″ (18.000″ O.D.) |
| SCH 10, 40, 80, 160, XXH | SCH-40 (.375) |
| 3″ ( 3.500″ O.D.) | SCH 5, 10, 40, 80, 160, XXH |
ASTM B444 Inconel 625 Pipe Dimensions
ASTM B444 Inconel 625 Pipe Dimensions are precisely manufactured to meet international standards. Typical dimensions include 33.40 x 3.38mm (1″ NB SCH40S), 60.33 x 3.91mm (2″ NB SCH40S), 48.26 x 3.68mm (1-1/2″ NB SCH40S), 88.90 x 5.49mm (3″ NB SCH40S), and 114.30 x 6.02mm (4″ NB SCH40S) for seamless annealed pipes. Cold drawn seamless pipes are available in precision dimensions with tolerances of ±0.5mm on OD and ±10% on wall thickness. Welded pipe dimensions include 60.33 x 2.77mm (2″ NB SCH10S) in bright solution annealed condition. Outside diameter tolerances comply with ASTM B444 requirements ensuring perfect fit-up for welding and assembly.
| ASTM B444 inconel 625 Pipe OD mm | Pipe WT mm | in. | Sch | Kg/m |
| 13.72 | 1.65 | 1/4 | 10S | 0.50 |
| 13.72 | 2.24 | 1/4 | 40S | 0.64 |
| 13.72 | 3.02 | 1/4 | 80S | 0.81 |
| 17.15 | 1.65 | 3/8 | 10S | 0.64 |
| 17.15 | 2.31 | 3/8 | 40S | 0.86 |
| 17.15 | 3.20 | 3/8 | 80S | 1.12 |
| 21.34 | 2.11 | 1/2 | 10S | 1.02 |
| 21.34 | 2.77 | 1/2 | 40S | 1.29 |
| 21.34 | 3.73 | 1/2 | 80S | 1.65 |
| 26.67 | 2.11 | 3/4 | 10S | 1.30 |
| 26.67 | 2.87 | 3/4 | 40S | 1.71 |
| 26.67 | 3.91 | 3/4 | 80S | 2.23 |
| 33.40 | 2.77 | 1 | 10S | 2.13 |
| 33.40 | 3.38 | 1 | 40S | 2.54 |
| 33.40 | 4.55 | 1 | 80S | 3.29 |
| 33.40 | 6.352) | 1 | 160 | 4.30 |
| 42.16 | 2.77 | 1¼ | 10S | 2.73 |
| 42.16 | 3.56 | 1¼ | 40S | 3.44 |
| 42.16 | 4.85 | 1¼ | 80S | 4.53 |
| 42.16 | 6.352) | 1¼ | 160 | 5.69 |
| 48.26 | 2.77 | 1½ | 10S | 3.16 |
| 48.26 | 3.68 | 1½ | 40S | 4.11 |
| 48.26 | 5.08 | 1½ | 80S | 5.49 |
| 60.33 | 2.77 | 2 | 10S | 3.99 |
| 60.33 | 3.91 | 2 | 40S | 5.52 |
| 60.33 | 5.54 | 2 | 80S | 7.60 |
| 60.33 | 8.742) | 2 | 160 | 11.29 |
| 73.03 | 3.05 | 2½ | 10S | 5.35 |
| 73.03 | 5.16 | 2½ | 40S | 8.77 |
| 73.03 | 7.01 | 2½ | 80S | 11.59 |
| 88.90 | 3.05 | 3 | 10S | 6.56 |
| 88.90 | 5.49 | 3 | 40S | 11.47 |
| 88.90 | 7.62 | 3 | 80S | 15.51 |
| 88.90 | 11.132) | 3 | 160 | 21.67 |
| 101.60 | 3.05 | 3½ | 10S | 7.53 |
| 101.60 | 5.74 | 3½ | 40S | 13.78 |
| 101.60 | 8.08 | 3½ | 80S | 18.92 |
| 114.30 | 3.05 | 4 | 10S | 8.50 |
| 114.30 | 6.02 | 4 | 40S | 16.32 |
| 114.30 | 8.56 | 4 | 80S | 22.67 |
| 114.30 | 13.492) | 4 | 160 | 34.05 |
| 141.30 | 6.55 | 5 | 40S | 22.10 |
| 141.30 | 9.53 | 5 | 80S | 31.44 |
| 141.30 | 15.882) | 5 | 160 | 49.87 |
| 168.28 | 3.4 | 6 | 10S | 14.04 |
| 168.28 | 7.11 | 6 | 40S | 28.69 |
| 168.28 | 10.97 | 6 | 80S | 43.21 |
| 168.28 | 14.27 | 6 | 120 | 54.75 |
| 168.28 | 18.262) | 6 | 160 | 68.59 |
| 219.08 | 8.18 | 8 | 40S | 43.20 |
| 219.08 | 12.7 | 8 | 80S | 65.63 |
| 219.08 | 18.23 | 8 | 120 | 91.30 |
| 219.08 | 23.012) | 8 | 160 | 112.97 |
ASTM B444 625 Inconel Pipe Pressure Rating
The ASTM B444 625 Inconel Pipe pressure rating varies significantly depending on schedule, temperature, and pipe diameter. At 100°F, typical pressure ratings include 19.21 ksi for 1.59 x 0.36mm pipe, 940 ksi for 3 x 0.5mm and 6 x 1mm sizes, 681 ksi for 8 x 1mm, and 1476 ksi for 8 x 2mm configurations. Pressure ratings decrease with increasing temperature – at 600°F, the same sizes rate at 18.15 ksi, 888 ksi, 644 ksi, and 1395 ksi respectively. Calculations follow ASME B31.3 American standards with wall tolerance of ±10%. Higher schedules (SCH 80, SCH 160) provide greater pressure capacity suitable for HPHT applications in oil and gas industries.
Pipe :
| Pipe O.D. (in.) | Wall Thickness of Tube (inches) | |||||||
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Tube :
| Size mm | Grade | Maximum internal pressure, ksi | ||||||||
| 100°F | 200°F | 300°F | 400°F | 500°F | 600° | F700°F | ||||
| 1.59 x 0.36 | N06625 | 19.21 | 19.21 | 19.02 | 18.83 | 18.54 | 18.15 | 17.77 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 3 x 0.5 | N06625 | 940 | 940 | 930 | 921 | 907 | 888 | 869 | ||
| 6 x1 | N06625 | 940 | 940 | 930 | 921 | 907 | 888 | 869 | ||
| 8×1 | N06625 | 681 | 681 | 675 | 668 | 658 | 644 | 630 | ||
| 8×2 | N06625 | 1476 | 1476 | 1462 | 1447 | 1425 | 1395 | 1366 | ||
| 10×1 | N06625 | 534 | 534 | 529 | 524 | 516 | 505 | 494 | ||
| 12×1 | N06625 | 440 | 440 | 435 | 431 | 424 | 415 | 407 | ||
| 16×1 | N06625 | 324 | 324 | 321 | 318 | 313 | 307 | 300 | ||
Inconel 625 Pipe Weight Chart
Our detailed Inconel 625 Pipe weight chart provides theoretical weights per meter or foot to assist engineers in structural calculations. The density of Inconel 625 (8.44 g/cm³) results in heavier piping compared to carbon steel. Accurate weight data is crucial for logistics planning and support structure design in offshore platforms.
| Pipe O.D. (in.) | Wall Thickness of Tube (inches) | |||||||
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Tube :
| Size mm | Grade | Maximum internal pressure, ksi | ||||||||
| 100°F | 200°F | 300°F | 400°F | 500°F | 600° | F700°F | ||||
| 1.59 x 0.36 | N06625 | 19.21 | 19.21 | 19.02 | 18.83 | 18.54 | 18.15 | 17.77 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 3 x 0.5 | N06625 | 940 | 940 | 930 | 921 | 907 | 888 | 869 | ||
| 6 x1 | N06625 | 940 | 940 | 930 | 921 | 907 | 888 | 869 | ||
| 8×1 | N06625 | 681 | 681 | 675 | 668 | 658 | 644 | 630 | ||
| 8×2 | N06625 | 1476 | 1476 | 1462 | 1447 | 1425 | 1395 | 1366 | ||
| 10×1 | N06625 | 534 | 534 | 529 | 524 | 516 | 505 | 494 | ||
| 12×1 | N06625 | 440 | 440 | 435 | 431 | 424 | 415 | 407 | ||
| 16×1 | N06625 | 324 | 324 | 321 | 318 | 313 | 307 | 300 | ||
Inconel 625 Tube Chemical Compositions
The exact Inconel 625 Tube chemical compositions have a high Nickel (min 58%), Chromium (20-23%), and Molybdenum (8-10%) matrix. This particular balance offers the legendary chloride-ion stress-corrosion cracking resistance of the alloy. To prevent sensitization in the structure, niobium is added during the welding process.
| Ni | Fe | C | Mn | Si | Cr2 | Mo | Co | Al | Ti | Nb + Ta | P | S |
| 58.0 min | 5.0 max | 0.10 max | 0.50 max | 0.50 max | 20.0-23.0 | 8.0-10.0 | 1.0 max | 0.40 max | 0.40 max | 3.15–4.15 | 0.015 max | 0.015 max |
Inconel 625 Tube Mechanical Properties
Superior Inconel 625 Tube mechanical property has a tensile strength of 120 ksi (827 Mpa) and yield strength of 60 ksi (414 Mpa). These properties guarantee structural integrity at extreme stress and vibration. The material has high fatigue strength and creep-rupture strength, which makes it suitable in the high-stress aerospace components.
| Standard | Designation |
| Density | 8.4 g/cm3 |
| Melting Point | 1350 °C (2460 °F) |
| Tensile Strength | Psi – 1,35,000 , MPa – 930 |
| Yield Strength (0.2%Offset) | Psi – 75,000 , MPa – 517 |
| Elongation | 42.5 % |
Inconel 625 Pipe Applications & Industries
Inconel 625 Pipe has been used in high-performance applications in industries that need high performance in harsh environments. These pipes are used in chemical processing plants which have a high corrosive acid, alkalis and organic compounds. They find application in the aerospace industry in aircraft ducting, exhaust systems, and thrust-reverser systems in which high temperature strength is the most important factor. Seawater coolers, submarine equipment and offshore platform equipment that are in contact with chloride environments are also used in marine engineering. The nuclear power plants specify the Inconel 625 to be used as the part of the reactor, steam generator tubing and radioactive waste processing systems. These pipes are used in sour gas, undersea equipment and high-pressure high-temperature (HPHT) wells in oil and gas operations. Pollution control equipment has implemented the resistance of the alloy to the desulfurization flue gas environments.
Inconel 625 Equivalent Grades & International Standards
It is important to know the Inconel 625 equivalent grades to make a global purchase and comply. The major grade is UNS N06625, which is internationally accepted, and the local standards verification will ensure that there is no difficulty in cross-referencing the project requirements to your particular needs. The list of international equivalencies is as follows:
- Primary Designation (UNS): N06625
- European Standards (W.Nr.): 2.4856
- DIN Designation: NiCr22Mo9Nb
- German Specification: VdTUV 263
- French Standard (AFNOR): NC 22 DNb
- Japanese Standard (JIS): NCF625
- Welding Designation (AWS A5.14): ERNiCrMo-3.
- Relevant International specifications:
- ASTM: B444, B704
- ASME: SB444
- AMS: 5581, 5599, 5666
Corrosion Resistance Properties of Inconel 625
Inconel 625 Pipe has an outstanding corrosion resistance because of its high nickel concentrations and chromium-molybdenum alloying, which constitute the matrix. It also exhibits exceptional resistance to pitting and crevice corrosion in chloride-containing conditions, and it is better than austenitic stainless steels. The alloy is oxidation and acid resistant over a wide range of concentrations and temperatures of nitric, phosphoric, sulfuric, hydrochloric acid. It has a very good stress-corrosion cracking resistance in chloride and caustic solution. At high temperatures, minimal attack is caused by seawater and brine solutions. The material is resistant to organic acid, alkaline solutions and neutral salt conditions. Temperature oxidation resistance up to 1800F and it is more resistant to carburization and nitriding atmosphere than a majority of high temperature alloys.
Manufacturing Process of Inconel 625 Seamless Pipe
Inconel 625 seamless pipe is produced by means of vacuum induction melting (VIM) or vacuum arc remelting (VAR) to achieve exceptional purity and uniform chemical composition. Hot extrusion or rotary piercing is used to convert the cast ingots to hollow shells. Through pilger mills, multiple hot-rolling processes are used to decrease the wall thickness and diameter without decreasing concentricity. Cold pilgering/cold drawing is used to reach higher dimensional tolerances and a better surface finish. In between annealing steps of cold-working phases ensure the lack of work hardening and preserve ductility. Surface scale is removed by final solution annealing then pickling in acid baths. Oxide-free surfaces are obtained by bright annealing in controlled atmosphere furnaces to be used in the critical applications. Strict quality control is maintained throughout all the stages that would guarantee adherence to the ASTM B444 and ASME SB444 standards.
Inconel 625 Pipe vs Other Nickel Alloys
The comparison of Inconel 625 Pipe and other nickel alloys assists in the optimization of the material selection. Alloy 625 has a higher strength and less susceptible to chloride-ion stress-corrosion cracking than Versus Inconel 600 because of its molybdenum content. Alloy 625 is easier to weld and does not need heat treatment after welding as Inconel 718 that has a higher strength by precipitation hardening. Inconel 625 is similar to Hastelloy C-276 in corrosion resistance and is more readily available as well as commonly less expensive. Alloy 625 is better suited to high temperature and oxidizing environments in comparison with Monel 400. Inconel 625, as compared to Versus Incoloy 825, is stronger in high temperatures, and has better resistance to reducing acids. This selection is conditioned by the peculiarities of the services, and Inconel 625 provides a compromising balance of the strength, corrosion resistance, and fabricability to the majority of the tasks which demand the highest requirements.
Inconel Pipe Roughness & Surface Finish
Surface roughness testers are used to measure roughness of the Inconel pipes, which are reported in Ra (arithmetic average) value. The surface roughness of Inconel 625 pipe ( e = 0.0015mm or 0.00006 inches) is lower than the Inconel 600 pipe, like the PVC, glass and other drawn tubing. This finish enables the minimization of friction loss in fluid flow systems and reduces fouling in chemical process systems. Welded steel of a commercial grade has a roughness of 0.045mm (0.0018), galvanized iron 0.15mm (0.006) and cast iron 0.26mm (0.010) by comparison. The cold-drawn Inconel 625 seamless pipes also have better surface finish that provides enhanced flow properties, pressure drop, and cleanability where sanitary use is required. Bright annealed finish offers the smoothest surface to industries that process pharmaceutical and food.
Mill Test Certificates of Inconel 625 Pipe Manufacturer
Mill Test Certificates of Inconel 625 a manufacturer of pipe offer a complete traceability of materials as well as quality assurance. Stellar Alloys sells EN 10204 3.1 certificates (inspection certificate by manufacturer) and EN 10204 3.2 certificates (inspection certificate by manufacturer confirmed by some independent inspection body). The Mill Test Report contains specifications of shape, size, and diameter, full chemical composition analysis, indicating percentages of Ni, Cr, Mo, Nb, Fe, and trace elements, physical and mechanical properties such as tensile strength, yield strength, elongation and hardness values, compliance with ASTM/ASME standards, country of melt and manufacture, heat number to allow full traceability and heat treatment condition (annaled, solution annealed, cold worked). Other records are manufactured test certificates, DFARS compliance statements, fumigation certificates, and certificates of raw materials.
Inconel 625 Pipes Test Reports & Inspections
Complete Inconel 625 Pipes Test Reports ensure the integrity of materials and conformity. Routine testing consists of macro and micro metallurgical testing to check the structure of the grain, testing of hardness by Rockwell or Brinell, pitting resistance testing according to ASTM G48, flattening testing according to ASTM A370, flaring testing of tube ends, chemical testing by spectro analysis (OES), verifying composition, mechanical testing such as tensile strength, yield strength, and elongation, intergranular corrosion (IGC) testing according to ASTM A262 Practice E, PMI testing according to XRF analysis, 1 All reports are summarized and certified by the NABL approved laboratories.
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Frequently Asked Questions (FAQ)
The Inconel 625 pipes come from 1/8″ to 30″ NB, which goes from sizes between 1/2″, 1″, 2″, 4″, 6″, and 12.” They also come in standard lengths of 6 m and 12 m, and wall thickness from 0.065″ to 1.5″.
The top manufacturer and supplier of Inconel 625 pipes in India is Stellar Alloys. They provide high-quality pipes with international approvals and export worldwide.
The seamless pipes have no welds, offer higher strength, and are used for high-pressure applications. On the other hand, its welded pipes are more economical and suitable for larger diameters and lower pressures.
The Inconel 625 pipes come in different international standards such as ASTM B444, B705, B751, and B775, with ASME equivalents SB444, SB705, SB751, and SB775.
Yes, it is easily weldable using TIG, MIG, or SMAW. The recommended filler metal is ERNiCrMo-3. No preheating is required.
The Inconel 625 pipe can operate in high temperatures that can go from 982°C (1800°F), with recommended structural use up to 649°C (1200°F), and performs well at cryogenic temperatures.
The stellar alloy provides all the necessary certifications that go to EN 10204 3.1/3.2 MTC, NACE, PED, IBR, and third-party inspection certificates as required.
The Inconel 625 pipes come in different standard such as Plain End (PE), Beveled End (BE) for welding, and Threaded Ends (NPT/BSP).
The Inconel 625 pipes markings include ASTM specification, UNS N06625, size, schedule, manufacturing type, heat number, and manufacturer name for full traceability.