Womic Stainless Steel Co., Ltd
Material & Grade
UNS: N06625
Common Name: Inconel® 625
Material Type: Nickel-Chromium-Molybdenum Alloy Steel
Product Forms: Seamless Pipes, Seamless Tubes, Heat Exchanger Tubes, U-Bend Tubes
Applicable Standards
ASTM B444 / ASME SB444 – Seamless Nickel Alloy Pipes & Tubes
ASTM B829 / ASME SB829 – General Requirements for Nickel Alloy Tubes
ASTM B704 / B705 (where applicable)
EN 10216-5 / EN 10204 3.1
GB/T 15007
Production Size & Dimension Range of N06625 (Inconel® 625) Nickel-Chromium-Molybdenum Alloy Pipes
Seamless Pipes & Tubes
Outside Diameter (OD):6.35 mm – 114.3 mm1/4” – 4”
Wall Thickness: 0.8 – 12.0 mm
Length:Random length or fixed lengthUp to 12 m, longer lengths available upon request
Surface Finish:
Annealed & Pickled (AP)
Bright Annealed (BA)
Heat Exchanger & U-Bend Tubes
OD: 12 – 38.1 mm
U-bend radius as per TEMA / drawing
Maximum straight length before bending: up to 30 m
Nickel alloys are engineered materials formed by combining nickel with other metallic elements such as chromium, molybdenum, iron, copper, aluminum, and titanium. These alloys are designed to deliver exceptional corrosion resistance, high-temperature strength, oxidation resistance, and mechanical stability in demanding industrial environments.
Today, more than 3,000 nickel-based alloys are in active use across multiple industries. Approximately 90% of all newly produced nickel each year is used in the manufacture of nickel alloys, highlighting their critical importance in modern engineering applications.
Nickel alloy pipes and tubes are manufactured with controlled chemical compositions including nickel, manganese, carbon, silicon, sulfur, iron, and copper, ensuring reliable performance in high pressure, high temperature, and corrosive service conditions.
Nickel Alloy Pipes & Tubes (Seamless & Welded)
Nickel Alloy Heat Exchanger Tubes
U-Bend Tubular Exchanger Tubes
Nickel Alloy Bars (Round, Square, Flat)
Nickel alloy pipes and tubes are available in various outer diameters, wall thicknesses, and lengths, manufactured in accordance with ASTM, ASME, EN, and other international standards.
|
Commercially Pure Nickel |
Nickel-Chromium-Iron Alloys |
Nickel-Chromium-Molybdenum Alloys |
Nickel-Molybdenum Alloys |
Nickel-Molybdenum-Chromium Alloys |
|
Nickel 200 / Nickel 201 Nickel-Copper Alloys Alloy 400 (Monel® 400) |
Alloy 600 Alloy 690 Alloy 20 (UNS N08020) Alloy 28 (UNS N08028) |
Alloy 625 (UNS N06625) Alloy C-4 Alloy C-22 Alloy C-2000 Alloy G-30 Alloy G-35 Nickel-Iron-Chromium Alloys Alloy 800 / 800H / 800HT Alloy 825 |
Alloy B-2 / Alloy B-3 |
Alloy C-276 |
Alloy 625 (UNS N06625) is a high-strength nickel-chromium-molybdenum superalloy renowned for its outstanding resistance to severe corrosion environments, including pitting, crevice corrosion, and chloride-induced stress corrosion cracking, as well as excellent oxidation resistance. It maintains exceptional mechanical properties across a wide temperature range, from cryogenic conditions up to approximately 1000°C (1800°F).
The alloy derives its high strength primarily from molybdenum and niobium solid-solution strengthening, eliminating the need for precipitation heat treatment. Alloy 625 also offers excellent fatigue strength, outstanding weldability, and structural stability in aggressive service conditions.
Due to these properties, Alloy 625 is widely used in aerospace, marine engineering, chemical processing, and oil & gas industries, particularly for demanding applications such as jet engine components, seawater handling equipment, heat exchangers, and downhole tools where high strength and superior corrosion resistance are critical.
|
Element |
Content |
|
Nickel (Ni) |
58% min |
|
Chromium (Cr) |
20% to 23% |
|
Molybdenum (Mo) |
8% to 10% |
|
Columbium + Tantalum (Nb + Ta) |
3.15% to 4.15% |
|
Iron (Fe) |
5.0% max |
|
Carbon (C) |
0.10% max |
|
Manganese (Mn) |
0.50% max |
|
Silicon (Si) |
0.50% max |
|
Phosphorus (P) |
0.015% max |
|
Sulfur (S) |
0.015% max |
|
Aluminum (Al) |
0.40% max |
|
Titanium (Ti) |
0.40% max |
|
Grade |
Heat treatment condition |
Typical service temperature note |
Typical buyer focus at receiving |
|
Grade 1 |
Annealed |
Normally employed up to 1100°F (593°C) |
Chemistry + mechanical results + traceability match PO line |
|
Grade 2 |
Solution annealed |
Normally employed above 1100°F (593°C) where creep/rupture resistance is required |
Heat treatment statement + mechanical values + any specified inspection scope |
Alloy 400 (UNS N04400) is a nickel–copper alloy known for its high strength and excellent toughness, with mechanical properties comparable to structural steel. It exhibits outstanding corrosion resistance across a wide range of environments, including seawater, hydrofluoric acid, sulphuric acid, and alkaline solutions.
The alloy maintains stable performance over a broad temperature range and offers good resistance to stress corrosion cracking, making it a reliable material choice for demanding industrial applications.
Chemical Composition of Alloy 400 (UNS N04400)
|
Weight % |
C |
S |
Ni+Co |
Fe |
Mn |
Si |
Cu |
|
Nickel 400 |
0.30 max |
0.024 max |
63.0 max |
2.50 max |
2.0 max |
0.50 max |
28-34 |
Mechanical Properties of Alloy 400 (UNS N04400)
|
Material |
Form and Condition |
Tensile Strength MPa |
Yield Strength (0.2% Offset) MPa |
Elongation (%) |
Hardness Rockwell B |
|
Alloy 400 |
Annealed Rod and Bar |
517-620 |
172-345 |
60-35 |
60-80 |
|
Alloy 400 |
Hot Rolled Plate Annealed |
482-586 |
193-345 |
50-35 |
60-76 |
|
Alloy 400 |
Sheet Annealed |
482-586 |
207-310 |
45-35 |
65-80 |
|
Alloy 400 |
Tube Cold drawn Annealed Seamless |
482-586 |
172-310 |
50-35 |
75 max |
Nickel Alloy 600 (UNS N06600) is a nickel–chromium–iron alloy that offers excellent resistance to oxidation at elevated temperatures. It also demonstrates outstanding resistance to chloride-ion stress corrosion cracking, corrosion by high-purity water, and caustic corrosion.
The alloy maintains stable mechanical properties over a wide temperature range and provides good fabricability and weldability, making it a widely used material in both high-temperature and corrosive environments.
Chemical Composition of Nickel Alloy 600 (UNS N06600)
|
Weight% |
C |
S |
Cr |
Cu |
Mn |
Si |
Ni |
Fe |
|
Nickel Alloy 600 |
0.15 max |
0.015 max |
14.0 - 17.0 |
0.50 max |
1.0 max |
0.50 max |
72.0 min |
6 - 10 |
Mechanical Properties of Nickel Alloy 600 (UNS N06600)
|
Temper |
Annealed |
|
|
Tensile Rm |
110 |
ksi (min) |
|
Tensile Rm |
738 |
MPa (min) |
|
R.p. 0.2% Yield |
37 |
ksi (min) |
|
R.p. 0.2% Yield |
255 |
MPa (min) |
|
Elongation (2” or 4D gl) |
45 |
% (min) |
Nickel Alloy 625 is a nickel–chromium–molybdenum–columbium alloy with a minimum nickel content of 58%. It is also known as Inconel® 625 or UNS N06625. The alloy is commonly supplied in accordance with ASTM B444 for pipes and tubes, and ASTM B443 for plates, sheets, and coils.
Alloy 625 provides excellent resistance to corrosion and oxidation in a wide range of aggressive environments, including seawater, acidic media, and high-temperature applications. Its high molybdenum and columbium (niobium) content contributes to superior strength without the need for heat treatment.
Chemical Composition of Nickel Alloy 625 (UNS N06625 / Inconel® 625)
|
Weight % |
Ni |
Cr |
Mo |
Nb + Ta |
Fe |
Ti |
C |
Mn |
Si |
S |
P |
Al |
Co |
|
Alloy 625 |
58.0 min |
20 - 23 |
8 -10 |
3.15 -4.15 |
5.0 max |
0.40 max |
0.10 max |
0.50 max |
0.50 max |
0.15 max |
0.15 max |
0.40 max |
1.0 max |
Mechanical Properties of Nickel Alloy 625 (UNS N06625 / Inconel® 625)
|
Temper |
Annealed |
|
|
Tensile Rm |
110 |
ksi (min) |
|
Tensile Rm |
738 |
MPa (min) |
|
R.p. 0.2% Yield |
37 |
ksi (min) |
|
R.p. 0.2% Yield |
255 |
MPa (min) |
|
Elongation (2” or 4D gl) |
45 |
% (min) |
The Alloy 800 series—comprising Incoloy® 800 (UNS N08800), 800H (UNS N08810), and 800HT (UNS N08811)—are nickel–iron–chromium superalloys designed for excellent high-temperature strength and superior resistance to oxidation, carburization, and other forms of high-temperature corrosion.
These alloys offer good metallurgical stability and are particularly well suited for prolonged service at elevated temperatures. Alloy 800H and 800HT feature controlled carbon content and grain size to enhance creep and stress-rupture properties, making them ideal for demanding thermal applications.
Chemical Compositionof Alloy 800 / 800H / 800HT
|
Weight % |
Ni |
Cr |
Fe |
C |
Al |
Ti |
Al+Ti |
|
Alloy 800 |
30-35 |
19-23 |
39.5 min |
0.10 max |
0.15-0.60 |
0.15-0.60 |
0.30-1.20 |
|
Alloy 800H |
30-35 |
19-23 |
39.5 |
0.05-0.10 |
0.15-0.60 |
0.15-0.60 |
0.30-1.20 |
|
Alloy 800HT |
30-35 |
19-23 |
39.5 |
0.06-0.10 |
0.25-0.60 |
0.25-0.60 |
0.85-1.20 |
|
ASTM Grain Size - Alloy 800 is not specified,Alloy 800H is 5 or coarser,Alloy 800HT is 5 or coarser. |
|||||||
Mechanical Properties of Alloy 800 / 800H / 800HT
|
Temper |
800 |
800H/HT |
||
|
Tensile Rm |
77.8 |
ksi (min) |
65 |
ksi (min) |
|
Tensile Rm |
536 |
MPa (min) |
448 |
MPa (min) |
|
R.p. 0.2% Yield |
22 |
ksi (min) |
25 |
ksi (min) |
|
R.p. 0.2% Yield |
150 |
MPa (min) |
172 |
MPa (min) |
|
Elongation (2” or 4D gl) |
20 |
% (min) |
20 |
% (min) |
Alloy 825 (UNS N08825) is a nickel–iron–chromium alloy with additions of molybdenum and copper. It provides excellent resistance to both reducing and oxidizing acids, as well as outstanding resistance to stress corrosion cracking and localized corrosion such as pitting and crevice attack.
The alloy is particularly resistant to sulphuric and phosphoric acids and maintains stable corrosion resistance across a wide range of aggressive chemical environments. Its balanced chemical composition makes Alloy 825 a reliable material for long-term service in corrosive and high-integrity applications.
Chemical Composition of Alloy 825 (UNS N08825)
|
Weight % |
Ni |
Fe |
Cr |
Mo |
Cu |
Ti |
C |
Mn |
S |
Si |
Al |
|
Alloy 825 |
38 - 46 |
22 min |
19.5 - 23.5 |
2.5 - 3.5 |
1.5 - 3 |
0.6 - 1.2 |
0.05 max |
1 max |
0.03 max |
0.5 max |
0.2 max |
Mechanical Properties of Alloy 825 (UNS N08825)
|
Temper |
Annealed |
|
|
Tensile Rm |
85 |
ksi (min) |
|
Tensile Rm |
590 |
MPa (min) |
|
R.p. 0.2% Yield |
35 |
ksi (min) |
|
R.p. 0.2% Yield |
240 |
MPa (min) |
|
Elongation (2” or 4D gl) |
30 |
% (min) |
Alloy 718 is an austenitic nickel-based superalloy known for its exceptional high yield strength, tensile strength, and creep-rupture properties at temperatures up to 1300°F (704°C). It also offers excellent oxidation resistance in service temperatures up to 1800°F (982°C).
The alloy achieves its high strength through precipitation hardening while maintaining good fabricability and weldability compared with many other high-strength nickel alloys. These characteristics make Alloy 718 one of the most widely used superalloys for demanding high-temperature and high-stress applications.
Chemical Composition of Alloy 718 (UNS N07718 / W. Nr. 2.4668)
|
Weight % |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Cb |
Ta |
Ti |
Al |
Co |
B |
Cu |
Fe |
|
Alloy 718 AMS 5662 |
0.08 |
0.35 |
0.015 |
0.015 |
0.35 |
17-21 |
50-55 |
2.8-3.30 |
4.75-5.50 |
0.05 |
0.65-1.15 |
0.20-0.80 |
1.00 |
0.006 |
0.30 |
Rem |
Mechanical Properties of Alloy 718 (UNS N07718 / W. Nr. 2.4668)
|
Temper |
Solution-treated |
|
|
Tensile Rm |
155 |
ksi (Max) |
|
Tensile Rm |
1069 |
MPa (Max) |
|
R.p. 0.2% Yield |
95 |
ksi (Max) |
|
R.p. 0.2% Yield |
655 |
MPa (Max) |
|
Elongation (2” or 4D gl) |
30 |
% (min) |
Nickel alloy piping and tubing are widely used in:
Oil & Gas Production and Processing
Chemical and Petrochemical Plants
Heat Exchangers, Condensers & Boilers
Power Generation & Nuclear Facilities
Marine Engineering & Seawater Systems
Aerospace & High-Temperature Equipment
Pollution Control & Desulfurization Units
Full supply of ASTM B444 Inconel 625 seamless pipes & tubes
Excellent control of chemical composition and mechanical properties
Superior corrosion resistance for harsh environments
Precision dimensional tolerance and smooth internal surface
Capability for straight tubes, U-bent tubes and custom fabrication
Strict quality inspection with full traceability
Competitive pricing with stable delivery time
One-stop solution for nickel alloy piping projects
Vacuum-refined nickel alloy billets
Hot extrusion / piercing
Cold drawing or cold rolling
Solution annealing heat treatment
Pickling & surface finishing
Eddy current / ultrasonic testing
Final inspection, marking & packing
Plastic end caps on both ends
Individual wrapping or bundle packing
Wooden cases or steel frame packaging
Seaworthy export packing
Customized packing available upon request
Delivery terms: EXW / FOB / CFR / CIF
Container or bulk cargo shipment
Worldwide delivery to Europe, Middle East, Asia, Africa & Americas
Reliable logistics partners for on-time delivery
Womic Stainless Steel – Reliable Inconel 625 Pipe & Tube Supplier
Email: info@womicstainless.com
Website: www.womicstainless.com
Contact us today for technical consultation, material selection, fast quotation, or urgent project support.
