Comprehensive information on Inconel 601/625 tubing

Inconel 601 and 625 tubes are nickel-based high-temperature alloy tubes known for their high strength and excellent corrosion and heat resistance. Inconel 625 tubes, due to their higher chromium, molybdenum, and niobium content, perform better in aqueous/marine environments and highly corrosive conditions, resulting in higher strength and toughness; while Inconel 601 seamless tubes excel in high-temperature oxidation and carburization resistance and are commonly used in furnaces, heat treatment equipment, and power generation. Inconel 625 alloy tubes are used in aerospace, chemical, and marine applications. Both alloys offer high-temperature strength and durability, but are optimized for different extreme environments.

What are the main differences between Inconel 600, 601, and 625?

Inconel 600 is primarily a nickel-chromium alloy with good oxidation resistance. Inconel 601 contains titanium to improve oxidation resistance at high temperatures, while Inconel 625 contains molybdenum to enhance corrosion resistance.

Specification of Inconel Alloy 601, 625 Pipes

Pipe/Tube Specifications:ASTM B167, B517, B516 / ASME SB167, SB517, SB516

Dimentions:ASTM, ASME

Pipe Outside Diameter: 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD Size Steel Tubes available Ex-stock

Tube Outside Diameter: 1/8" OD TO 2"OD 3MM OD TO 38 MM OD

Range:1/2" OD up to 5" OD, customs diameters also available

Type: Seamless / ERW / Welded / Capillary Tubes

Form: Round Tube, Square Tube, Rectangular Tube

Length: Single Random, Double Random & Required Length

End: Plain End, Beveled End, Treaded

End Protection: Plastic Caps

Finish: Annealed and Pickled, Polished, Bright Annealed, Cold Drawn

Equivalent Grades of Inconel Alloy 601/625 Tubes

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
Inconel 601	2.4851	N06601	NCF 601	NA 49	XH60BT	NC23FeA	NiCr23Fe
Inconel 625	2.4856	N06625	NCF 625	NA 21	ХН75МБТЮ	NC22DNB4M	NiCr22Mo9Nb

Chemical Composition of Inconel Alloy 601/625 Pipes

Grade	C	Mn	Si	S	Cu	Fe	Ni	Cr
Inconel 601	0.10 max	1.0 max	0.5 max	0.015 max	1.0 max	Balance	58.0 – 63.0	21.0 – 25.0
Inconel 625	0.10 max	0.50 max	0.50 max	0.015 max	-	5.0 max	58.0 min	20.0 - 23.0

Alloy 601/625 Tubes Mechanical Properties

Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Inconel 601	8.1 g/cm3	1411 °C (2571 °F)	Psi – 80,000 , MPa – 550	Psi – 30,000 , MPa – 205	30 %
Inconel 625	8.4 g/cm3	1350 °C (2460 °F)	Psi – 1,35,000 , MPa – 930	Psi – 75,000 , MPa – 517	42.5 %

Dimensions of Nickel 601/625 Pipe standard specifications

Nominal Pipe Size (NPS)	Outer Diameter (OD) (inches)	Outer Diameter (OD) (mm)	Schedule 10 Wall Thickness (inches)	Schedule 40 Wall Thickness (inches)	Schedule 80 Wall Thickness (inches)
1/8	0.405	10.29	0.049	0.068	0.095
1/4	0.540	13.72	0.065	0.088	0.119
3/8	0.675	17.15	0.065	0.091	0.126
1/2	0.840	21.34	0.083	0.109	0.147
3/4	1.050	26.67	0.083	0.113	0.154
1	1.315	33.40	0.109	0.133	0.179
1-1/4	1.660	42.16	0.109	0.140	0.191
1-1/2	1.900	48.26	0.109	0.145	0.200
2	2.375	60.33	0.109	0.154	0.218
2-1/2	2.875	73.03	0.120	0.203	0.276
3	3.500	88.90	0.120	0.216	0.300
4	4.500	114.30	0.120	0.237	0.337
5	5.563	141.30	0.134	0.258	0.375
6	6.625	168.28	0.134	0.280	0.432
8	8.625	219.08	0.148	0.322	0.500
10	10.750	273.05	0.165	0.365	0.500
12	12.750	323.85	0.180	0.375	0.500
14	14.000	355.60	0.188	0.375	0.500
16	16.000	406.40	0.188	0.375	0.500
18	18.000	457.20	0.188	0.375	0.500
20	20.000	508.00	0.218	0.375	0.500
24	24.000	609.60	0.218	0.375	0.500

Advantages of various Inconel 601/625 pipes
Inconel 600 Pipes
Advantages:

Corrosion Resistance: Exhibits excellent oxidation and corrosion resistance at high temperatures, making it ideal for chemical and aerospace industry applications. Among these grades, Inconel 600 is best suited for environments requiring oxidation resistance.
High-Temperature Strength: Maintains high strength and stability at temperatures up to 700°C (1300°F), suitable for furnace components and heat exchangers. Compared to other grades, it achieves a balance in performance without requiring special strengthening like Inconel 625 or 718.
Versatility: Performs well in both oxidizing and reducing environments, making it more versatile than Inconel 800.

Inconel 625 Pipes
Advantages:

High Strength: Possesses excellent tensile strength and creep rupture strength, especially at high temperatures up to 982°C (1800°F), making it the strongest material among these grades for high-temperature applications.
Corrosion Resistance: Exhibits excellent corrosion resistance to various corrosive environments, including pitting and crevice corrosion. It surpasses Inconel 600 and 800 in corrosion resistance in harsh environments.
Machinability: Offers excellent weldability and machinability, allowing for the manufacture of complex and critical components. For applications requiring extensive machining, Inconel 625 is the best choice.

Why Choose Gnee as Your Nickel-Based Alloy Supplier

✅ Over 18 years of export experience, products sold to more than 80 countries

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📦 Packaging and Shipping

All stainless steel products are packaged using the following methods:

Wooden pallets or crates

Moisture-proof packaging

Labels with furnace number, standard, and size labels

Shipped worldwide by sea, air, or express