Incoloy alloy 028

Description

Overview:

With Incoloy 028, you get access to an extensively alloyed stainless steel of the austenitic kind that offers resistance to corrosive media environments. Given its chromium & molybdenum content, this alloy offers high resistance to oxidizing & reducing acids or salts.

Apart from this, the inclusion of copper enhances its overall resistance to H2SO4 acid. In terms of usage, this alloy is used on a wide scale in industries such as petrochemical or chemical processing. The alloy tubes can be cold worked for enhanced strength when kept in a moderately corrosive sour gas well.

Common Names:

• UNS N08028
• Nr.1.4563

Executive Standards:

• ASTM B829
• ASTM B709
• ASTM B 668
• ASME SB-668
• ASME SB-709
• ASME SB-829

Chemical Properties:

Iron (%)	20-40.4
Chromium (%)	26-28
Nickel (%)	30-34
Manganese (%)	Max 2.5
Molybdenum (%)	3-4
Others (%)	Remainder

Mechanical Properties:

Yield Strength	Metric	214 MPa
	Imp	31 Ksi
Tensile Strength	Metric	500 Mpa
	Imp	72.5 Ksi
Break Elongation (Cold Worked)	Metric	15 %
	Imp	50 %
Elasticity Modulus	Metric	200 GPa
	Imp	29000 Ksi
Hardness (Rockwell B)	Metric	80-90
	Imp	80-90
Hardness (Rockwell C)	Metric	33
	Imp	33

Physical Properties:

Density	Lb/In3	0.29
	g/cm3	8.0
Specific Heat	Btu lb oF	0.105
	J/kg oC	450
Expansion Coefficient	21 to 427 oC	15.0-16.8
	103 Ksi	29.0
Young’s Modulus	GPa	200
	Btu in/ft2 hoF	66
Thermal Conductivity	W/m oC	11.4
	Ohm circ mil/ft	594
Electrical Resistivity	Micro ohm m	0.99

 Key Features:

• Surface Pitting Resistance: Given its strong build, the alloy is resistant to surface pitting or cracking with minimal physical deterioration.
• Handles High Temperature: Incoloy alloy 028 is perfect to be worked with elevated temperature.
• Fabrication Ease: Incoloy also flaunts easy fabrication properties to be molded into a designed size or shape in the tube form.
• Resistant to Creep Rupture: Incoloy alloy 028 is a great metal mix that flaunts perfect rupture strength in high temperatures or acid-corrosion settings.

Product Forms Available:

• Tube

Applications:

• Chemical processing
• Petrochemical Processing
• Downhole service (Deep Wells with Sour Gas)
• Ship Building
• Construction

Possible Alternative Grades:

• Incoloy A-286: This nickel-based alloy comes with the inclusion of titanium, aluminum, molybdenum, vanadium, or traces of the boron metal.
• Incoloy 926: Incoloy 926 comes with titanium & aluminum alongside the main nickel component. It also houses an adequate amount of chromium as well.
• Incoloy 925: This Mo-Cu-Ni based alloy is perfect for cold working as well as hot working requirements.
• Incoloy 901: This austenitic alloy is known for its properties for age hardening. Apart from titanium & aluminum, it also houses traces of lower carbon as well as boron.

Frequently Asked Questions:

• What differentiates Inconel from Incoloy?

The prime difference between the two is the composition. Inconel is primarily comprised of nickel and chromium, with nickel going over 50%. On the other hand, Incoloy is a nickel-chromium-iron alloy where nickel is below 50%.

• Is Incoloy open to cold working?

Yes, cold working can be done with Incoloy, but only after the annealing process is complete.

• What are some of the critical places for Incoloy use?

Incoloy is used in areas such as turbine blades, nuclear industry, as well as rocket engines.

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