Nickel-based super alloy: Incoloy 901 (UNS N09901)

What is Incoloy 901?

The Cr content in nickel-based alloy incoloy 901 is usually 11.0-14.0%, and the nickel content is 40.0-45.00%. Incoloy 901 alloy is a nickel-based alloy containing molybdenum and copper, with good hot and cold working properties. Incoloy901 is an austenitic age-hardening alloy based on Fe-43Ni-12Cr, adding titanium, aluminum and equal strengthening elements, and contains a small amount of boron and lower carbon. It is metastable γ”[Ni3(Ti, Al)] phase dispersion strengthening, a small amount of aluminum can inhibit the conversion of γ” to η-Ni3Ti phase.
Incoloy 901 alloy has high yield strength and endurance strength below 650℃, good oxidation resistance below 760℃, and stable organization after long-term use. This alloy is a relatively mature alloy developed in the early stage. It is widely used in the manufacture of rotating discs (turbine discs, compressor discs, journals, etc.), static structural parts, turbines for aviation and ground gas turbine engines operating below 650°C. Parts such as outer ring and fasteners.

Chemical composition (%) of nickel-based alloy incoloy 901 (UNS N09901):

Alloy 901 has good corrosion resistance to the atmospheres normally found in jet engine operations. It has slightly lower scaling resistance than such alloy as Types 309 and 310 stainless steel.

C≤ Si≤ Mn≤ P≤ S≤ Cr≥ Ni≥ Mo≥ Cu≤
0.02-0.06 0.40 0.50 0.020 0.008 11.0-14.0 40.0-45.0 5.0-6.5 0.20
other B≤ Al≤ Ti≤ Fe≤ Bi≤ Pb≤ Ag≤ Nb≤
0.01-0.02 0.30 2.80-3.10 margin 0.0001 0.001 0.0005

Typical Mechanical Properties of nickel-based alloy incoloy 901 (UNS N09901)

Tensile Properties

Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

Test
Temperature

0.2% Offset
Yield Strength

Ultimate
Tensile Strength

% Elongation
in 2″

% Reduction
of Area

°F

°C

ksi

MPa

ksi

MPa

70
800
1000
1200
1300
1400
1500

21.1
427
538
649
704
760
816

125.0
116.5
113
117
114
102.5
79

862
803
779
807
786
707
545

175
159
156
150
130
107.5
81

1207
1096
1076
1034
896
741
559

15.0
16.0
17.0
14.0
11.5
9.0
13.0

19.0
25.5
29.0
21.0
15.5
14.5
20.0

Stress Rupture Strength

Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

Test
Temperature

Stress to Produce Rupture in

°F

°C

10 Hours

100 Hours

1000 Hours

ksi

MPa

ksi

MPa

ksi

MPa

1000
1200
1350
1500

538
649
732
816


96.5
60
35


665
414
241

120
90
51
22.5

827
621
352
155

100
75
33
11

689
517
228
76

Physical Properties nickel-based alloy incoloy 901 (UNS N09901)

  • Density, lb/cu in……………………………………………………………….. 0.294
  •           Mg/cu m……………………………………………………………….. 8.14
  • Melting Range, °F……………………………………………………… 2335-2455
  •                     °C……………………………………………………… 1280-1345
  • Specific heat, Btu/lb-°F………………………………………………………. 0.103
  •                      J/kg-°C…………………………………………………………… 431
  •  Permeability at 200 oersted (15.9 kA/m)………………………………..1.013
  •  Coeffiecent of Expansion,  68-212°F, 10(-6) in/in-°F………………. 7.50
  •                                              20-100°C, æm/m-°C……………………. 13.50
  •  Electrical Resistivity, ohm-cir mil/ft……………………………………….. 674
  •                                      æê-m………………………………………………….. 1.12

Heat treatment system of nickel-based alloy incoloy incoloy 901 (UNS N09901):

Solution Treatment

1975/2025°F (1080/1107°C), hold 2 hours at heat, and water quench.

Stabiliztion Treatment

1400/1475°F (760/802°C), hold 2 to 4 hrs, and air cool.

Precipitation Hardening Treatment

1300/1375°F (704/746°C), hold for 24 hours, and air cool.

Smelting and casting process of nickel-based alloy incoloy incoloy 901 (UNS N09901):

Alloy is produced by the dual process of vacuum induction and vacuum arc remelting, or vacuum induction and electroslag remelting process.

Workability of nickel-based alloy incoloy 901 (UNS N09901)

Hot Working

Alloy 901 is forged between 2050°F (1121°C) and 1850°F (1010°C), metal temperature. Light hot work may be continued down to 1600°F (871°C) but not below. Metal temperature should not exceed 2050°F (1121°C) during rapid working. Billets should be charged into a hot furnace and heated rapidly through the precipitation hardening range.

Weldability

Alloy 901 can be welded by the inert-gas-arc method. It is difficult to weld. All welding should be done in the solution treated condition. Cold worked parts should be re-solution treated before welding. A re-solution treatment is recommended after welding before stabilizing and aging.

Application areas of nickel-based alloy incoloy 901 (UNS N09901):

This alloy is widely used abroad for rotating parts and fasteners on aero engines and ground gas turbines that work below 650°C, and has a long service life. It has also been used in aero engines in China, and it is a mature alloy that has passed the test of use. Alloy forging is advanced, if the process parameters are selected or operated improperly, its performance will show obvious directionality and may cause notch sensitivity, but as long as the process is strict, this phenomenon will not occur. The expansion coefficient of the alloy is close to ferritic heat-strength alloy steel, so that the two materials can be connected and there is no special requirement for the heat account.

  • Heating pipes, containers, baskets and chains used in sulfuric acid pickling plants.
  • Sea water cooling heat exchanger, marine product pipeline system, acid gas environment pipeline.
  • Heat exchanger, evaporator, washing, dip tube, etc. in phosphoric acid production.
  • Air heat exchanger in petroleum refining.
  • Food engineering, chemical process.
  • Flame retardant alloy for high pressure oxygen application.
  • Heat exchange tubes
  • Pipe fittings
  • Flanges
  • Valves

Variety specifications and supply status of Nickel-based super alloy: Incoloy 901 (UNS N09901):

Variety classification:

Yaang Pipe Industry can produce various specifications of Incoloy 901 seamless pipe, Incoloy 901 steel plate, Incoloy 901 round bar, Incoloy 901 forgings, Incoloy 901 flangeIncoloy 901 pipe fittings, Incoloy 901 welded pipe , Incoloy 901 steel strip, Incoloy 901 wire and supporting welding materials. 

Delivery status:

  • Seamless pipe: solid solution + acid white, length can be set;
  • Plate: solid solution, pickling, trimming;
  • Welded pipe: solid solution acid white + RT% flaw detection;
  • Forging: annealing + car polish; Bars are forged and rolled, surface polished or car polished;
  • Strips are delivered after cold rolling, solid solution soft state, and deoxidized;
  • Wire rods are finely ground in solid solution pickled disk or straight strips, solid solution straight strips Delivery in light state.

Source: China Incoloy 901 Flanges Manufcturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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Summary
nickel based super alloy incoloy 800 uns n08800 w nr 1 4876 - Nickel-based super alloy: Incoloy 901 (UNS N09901)
Article Name
Nickel-based super alloy: Incoloy 901 (UNS N09901)
Description
The Cr content in nickel-based alloy incoloy 901 is usually 11.0-14.0%, and the nickel content is 40.0-45.00%.
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www.steeljrv.com
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