Inconel Alloy 690

Description

Overview:

Created from a unique combination of nickel-iron-chromium, the Inconel Alloy 690 is perfect to be used in different types of oxidizing media. It houses an approximate of 30% chromium, which caters it an excellent aqueous media resistance.

This alloy has amazing resistance to several variants of corrosive media when kept at high temperatures. It possesses excellent fabrication characteristics & high rupture strength. The presence of a high amount of nickel ensures there is minimal to zero cracking from stress-corrosion.

Common Names:

• UNS N06690
• Alloy 690
• Nr.2.4642
• ISO NW6690

Executive Standards:

Bar, Rod, Forging Stock, & Wire

• ASTM B166
• ASME SB 564
• MIL-DTL-24801
• ASME SB 166
• ISO 9723
• ASTM B 564
• ASME Code Case N-525

Seamless Tube & Pipe

• ASTM B 163
• ASME SB 167
• ASME SB 163
• ASME SB 829
• ASTM B 167
• ISO 6207
• MIL- DTL-24803
• N- 20, N-525
• ASTM B 829
• ASME Code Cases 2083

Strip, Plate, & Sheet

• ISO 6208
• ASME SB 168
• ASTM B168
• ASME N-525
• MIL-DTL-24802

Chemical Properties:

Chromium (%)	27.0 to 31.0
Nickel (%)	58.0 Minimum
Carbon (%)	0.05 Maximum
Iron (%)	7.0 to 11.0
Silicon (%)	0.50 Maximum
Sulfur (%)	0.015 Maximum
Manganese (%)	0.50 Maximum
Copper (%)	0.50 Maximum

Mechanical Properties:

Yield Strength	Ksi	35 Minimum
	MPa	240 Minimum
Tensile Strength	Ksi	86 Minimum
	MPa	590 Minimum
Elongation	%	30 Maximum

Physical Properties:

Density	lb/in3	0.296
	Mg/m3	8.19
Specific Heat	Btu/lb-°F	0.107
	J/kg-°C	450
Melting Range	°F	2450 to 2510
	°C	1343 to 1377
Permeability	200 Oersteds	1.001
Electrical Resistivity	ohm-circ mil/f	69.1
	μΩ-m	1.148
Young’s Modulus	Ksi	30.6 x 103
	GPa	211
Poisson’s Ratio	–	0.289

Key Features:

• Machinability: Inconel 690 is easily machinable with the use of conventional machining that is performed by bringing in commercial coolants.
• Weldability: Inconel Alloy 690 is welded with the use of metal-arc, gas-tungsten arc, gas-metal arc, as well as submerged-arc.
• Easy Hardening: Inconel 690 has been designed to be hardened easily for industrial usage. It generally requires the use of a cold working process to be hardened.

Product Forms Available:

• Rod
• Bar
• Forging Stock
• Wire
• Tube
• Pipe
• Strip
• Plate
• Sheet

Applications:

• Furnaces
• Duct Work
• Burners (High Temperature)
• Petrochemical Heaters

Possible Alternative Grades:

• Incoloy 800:

When kept at elevated temperatures, Incoloy 800 offers oxidation resistance, sulfidation, as well as carburization.

• Inconel 600:

When used at standard operating temperature, Inconel 60 is an optimum alternative for Inconel 690 with lower thermal conductivity.

• Inconel 617:

This strengthened & solid solution alloy brings in exceptional oxidation resistance & strength in elevated temperatures.

Frequently Asked Questions:

• How is Alloy 690 different from austenitic SS?

The Alloy 690 flaunts a higher rate for work hardening as compared to the austenitic SS, which is why it should always be cold worked post-annealing.

• How does the Alloy 690 work in acidic mediums?

The Alloy 690 shows exceptional resistance to mixtures that include hydrofluoric and nitric acid.

• How to ensure stable machining for Alloy 690?

Heat dissipation via the use of suitable quantity aqueous lubricants ensures highly-stable machining for the alloy 690.

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