Inconel 690 Pipe

Inconel 690 pipe (UNS N06690 / W.Nr.2.4642) is a high chromium-nickel alloy with excellent resistance to corrosive aqueous media and high temperature atmospheres. In addition to corrosion resistance, alloy 690 has high strength, good metallurgical stability and good fabrication characteristics.Inconel 690 pipe has excellent resistance to high-temperature oxidation and outstanding corrosion resistance, especially in high-temperature sulfur-containing and oxidizing media.Inconel 690 pipe is widely used in harsh environments, such as nuclear power, chemical, heat treatment, waste gas treatment and offshore engineering and other harsh environments. Contact us

Inconel 690 Pipe Specifications

Size	15 NB to 150 NB IN
Type	Seamless/ERW/Welded/Fabricated/LSAW Pipes
Standards	ASME SB-167 ASME SB-829 ASME SB-775 ASME SB-725,UNS N06690/Werkstoff Nr:2.4816
End	Plain End,Beveled End,Treaded.
Length	Single Random,Double Random &Cut Length.
Form	Round,Square,Rectangular,Hydraulic Etc.

Alloy 690 is designated as UNS N06690, W. Nr. 2.4642 and ISO NW6690.

Rod, Bar, Wire and Forging Stock: ASTM B166; ASME SB 166, ASTM B 564; ASME SB 564, ASME Code Case N-525, ISO 9723, MIL-DTL-24801

Seamless Pipe and Tube:  ASTM B 163; ASME SB 163, ASTM B 167; ASME SB 167, ASTM B 829; ASME SB 829, ASME Code Cases 2083, N- 20, N-525, ISO 6207, MIL- DTL-24803

Plate, Sheet, and Strip:  ASTM B168; ASME SB 168; ASME N-525, ISO 6208, MIL-DTL-24802

Welding Products: – INCONEL Filler Metal 52 – AWS A5.14 / ERNiCrFe-7

INCONEL Welding Electrode 152 – AWS A5.11 / ENiCrFe-7

Inconel Grade 690 Chemical Composition

Element	Ni	Cr	Fe	C	Si	Mn	S	Cu
Inconel 690	≥58.0	27.0-31.0	7.0-11.0	≤0.05	≤0.50	≤0.50	≤0.015	≤0.50

Alloy 690 Pipe Mechanical Properties

Condition & Size	Tensile Strength	Yield Strength (0.2% Offset)	Elongation
	MPa, min	MPa, min	%, min
Hot-worked or hot-worked annealed / 5 in. (127 mm) in outside diameter and under	586	205	35
Hot-worked or hot-worked annealed / Over 5 in. (127mm) in outside diameter	515	170	35
Cold-worked annealed / 5 in. (127 mm) in outside diameter and under	586	240	30
Cold-worked annealed / Over 5 in. (127mm) in outside diameter	586	205	35

Alloy 690 Pipe Physical properties

Alloy 690 Density, kg/dm3	Permeability	Melting range, ℃	Electrical resistivity, μΩ•m	Thermal conductivity, W/m•℃	Poisson’s ration	Coefficient of expansion (0~100°C), ×10-6/℃	Young Modulus, GPa
8.19	1.001	1343~1377	1.148	13.5	0.289	14.06	211

Inconel Grade 690 Equivalent Standards

STANDARD	JIS	BS	WERKSTOFF NR.	UNS	AFNOR	EN	OR	GOST
Inconel 690	NCF 690	NA 21	2.4856	N06690	NC22DNB4M	NiCr22Mo9Nb	ЭИ602	ХН75МБТЮ

Main properties:

Excellent resistance to high-temperature oxidation: it remains stable in environments up to 1000°C. It also has good metallurgical stability, making it suitable for extreme temperatures and high pressures. It also has good metallurgical stability, making it suitable for use in extreme high temperature and high pressure environments.

Excellent corrosion resistance: The high chromium content of Inconel 690 pipe gives it excellent resistance to oxidizing chemicals and high temperature oxidizing gases. Particularly suitable for resistance to sulfurized, chlorinated and fluorinated environments.

Good mechanical properties: good high-temperature strength and structural stability.

Good machinability: weldable and suitable for various machining methods.

Comparison to 316L Stainless Steel pipe:

316L Stainless Steel pipe is a widely used austenitic stainless steel pipe. Compared with stainless steel pipe (such as 304 or 316L), the corrosion resistance of Inconel 690 pipe has been significantly improved, in oxidizing media show significantly stronger resistance to stress corrosion cracking and lower corrosion rate, especially in strong oxidizing acids, complex media containing chloride ions and high temperature environment, 316L stainless steel pipe is prone to corrosion, while Inconel 690 alloy pipe Inconel 690 alloy pipe can maintain good corrosion resistance.

Comparison with Hastelloy pipe:

Hastelloy pipe is also a class of high-performance corrosion-resistant alloy pipe. In some specific corrosive environments, such as in the reducing acid medium, part of the Hastelloy pipe may have better corrosion resistance. But overall, Inconel 690 alloy pipe in oxidizing acids, chloride-containing environment and high temperature and high pressure water media and other conditions, the comprehensive corrosion resistance and Hastelloy pipe is comparable to the high-temperature strength and creep resistance has certain advantages.

Comparison to Inconel 600 Alloy pipe

Inconel 690 by adjusting the chromium content to further enhance the corrosion resistance in strong oxidizing acids , while maintaining good mechanical strength and processing characteristics, so that in the field of chemical industry and nuclear waste treatment and other areas with irreplaceable value.

Application Areas:

Nuclear power plant steam generator pipes

Heaters and heat exchangers in chemical equipment

High-temperature gas combustion furnace tubes

Waste incineration and treatment equipment

Seawater desalination equipment and offshore platforms

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）

Frequently Asked Questions (FAQs)

1. What is an Inconel pipe?

Inconel tubes are high-performance metal tubes made of Inconel alloys, whose main components are nickel, chromium and iron, with excellent high temperature, corrosion and oxidation resistance. These tubes are widely used in extreme environments such as aerospace, nuclear power, chemical industry, marine engineering and high temperature gas processing equipment, and are able to work stably for long periods of time under high temperatures, high pressures and strong corrosive media.

2. Why is Inconel so expensive?

The production cost of N06690 alloy is relatively high, mainly due to its high nickel and chromium content, which makes the alloy more expensive in terms of cost. With the diversification of application environments, the long-term durability of the alloy under extreme conditions still needs to be further studied and optimized. Therefore, future research should focus on improving the economics of its production process while enhancing its overall performance under extreme environments.

3. What are the key properties of Inconel 690?

Inconel 690 has a range of excellent properties that make it well suited for harsh high temperature and corrosive environments. Its main features include: excellent resistance to high-temperature oxidation, very strong corrosion resistance, good mechanical strength and structural stability. In addition, it has excellent machining and welding properties for ease of fabrication and installation. These key characteristics make Inconel 690 an ideal material choice for the nuclear, chemical and heat treatment industries.