Inconel Alloy 625

Description

Overview:

Inconel Alloy 625 is a nickel-chromium based alloy that is derived from the stiffening effect of molybdenum and niobium on the nickel-chromium matrix. This composition portrays high resistivity at high-temperature. It is widely used in sea-water applications and chemical and nuclear industries, respectively.

Its excellent braze-ability also makes it a fitting choice for aerospace industries. Inconel 625 can withstand very high temperature, and thereby it is used in turbines, combustion systems, rocket parts, etc. It is comparatively light-weight and can be easily fabricated into desired shapes.

Common Names:

• Haynes 625
• Nicrofer 6020
• Altemp 625
• Inconel 625
• Chronin 625
• Nickelvac 625

Executive standards:

Forging stock, wire, rod & bar: 

• ASTM B 564
• ASME SB 564
• ISO 9725
• DIN 17754
• SAE/AMS 5666
• ASME Code Case 1935
• SAE/AMS 5837
• ISO 9724
• DIN 17753
• ASTM B 446/ASME SB 446
• ISO 9723
• VdTUV 499
• BS 3076NA21
• DIN 17752
• EN 10095

Sheets, Plates & strips:

• BS3072NA21
• ASTM B 443/ASTM SB 443
• SAE/AMS 5599/5869/MAM 5599
• ISO 6208
• EN 10095
• BS 3072NA21
• VdTUV 499
• DIN 17750
• ASME Code Case 1935

Tube & Pipes

• ASTM B 444/B 829
• ASME SB444/SB 829
• SAE/AMS 5581
• BS3074NA21

Other Product forms

• ASTM B 366/ASME SB 366
• ISO 4955A
• DIN 17744

Chemical Properties:

Nickel (%)	Min 58
Chromium (%)	20-23
Molybdenum (%)	8-10
Iron (%)	Max 5
Niobium (%)	3.15-4.15
Cobalt (%)	Max 1
Others (%)	Remainder

Mechanical Properties:

Condition	As-Rolled	Annealed	Solution-Treated
Tensile Strength	120-160 ksi	120-150 ksi	105-130 ksi
	827-1103 MPa	827-1034 MPa	724-890 MPa
Yield Strength	60-110 ksi	60-95 ksi	42-60 ksi
	414-758 MPa	414-655 MPa	290-414 MPa
Elongation (%)	60-30	60-30	65-40
Reduction (%)	60-40	60-40	90-60
Hardness	175-240	145-220	116-194

Physical Properties:

Density	Lb/In3	0.305
	g/cm3	8.44
Specific Heat	Btu lb oF	0.105
	J/kg oC	450
Melting Range	oF	2350-2460
	oC	1290-1350
Specific Heat	Btu/lb at 0oF	0.096
	J/kg oC	402
Permeability	At 200 Oersted (15.9 kA/m)	1.0006
Cure Temperature	oF/ oC	<-320/-196

Key Features:

• High-temperature Resistant: It can withstand temperature up to 1148k and therefore is used in the core of many nuclear reactors. It is also used in manufacturing several parts of rockets.
• High Weldability: Inconel Alloy 625 is the perfect choice as a welding metal. Due to easy fabricability and high weldable properties, it is widely used in the chemical industry to manufacture various types of equipment that are required in chemical plants like columns for distillation, reactor vessels, heat exchangers, etc.
• Corrosion Resistant: It has commendably high corrosion-fatigue strength and high tensile strength. It can provide good protection against chloride ions present in sea-water and thus are used for manufacturing underwater pipes, cables, submarine parts, etc.

Product Forms Available

• Rod
• Bar
• Wire
• Forging Stock
• Plate
• Sheets
• Strips
• Pipes
• Tubes

Applications

• Nuclear Reactors
• Submarine parts
• Mooring Cables
• Propeller Blades
• Bubble Caps
• Heat-exchangers
• Undersea communication cables

Possible Alternative Grades

There are 4-alternatives for Inconel Alloy 625, with varying components of its main components – Nickel and Chromium. Here is the table for alternatives of this alloy along with its composition.

Alternative	Nickel (min %)	Chromium (min %)
Inconel 600	72	14
Inconel 617	44.5	20
Inconel 690	58	27
Inconel 718	50	17

Frequently Asked Questions:

• What is the working temperature range of Inconel 625?

Inconel 625 can be used at a very high-temperature range of 1200-1400 °F.

• Why do we observe hardening effect at high temperatures in Inconel 625 alloy?

We can observe the hardening effect at a temperature of and above 1200°F, and it occurs due to the precipitation of a phase that is rich in Nickel and Niobium.

• What is meant by the LCF variety of Inconel 625?

LCF refers to Low Cycle Fatigue. It refers to a modified version of the alloy that has comparatively better cycle fatigue and resistivity towards thermal fatigue, thereby increasing its usability.

Get A Free Quote Now!