High Temp Metals 800-500-2141

ALLOY 901 TECHNICAL DATA


Type Analysis | Description | Corrosion Resistance | Heat Treatment | Workability | Typical Mechanical Properties | Physical Properties

Type Analysis

Element

Min

Max

Nickel + Cobalt

40.0

45.0

Chromium

11.0

14.0

Silicon

--

0.40

Sulfur

--

0.03

Cobalt

--

1.00

Iron

Remainder

Aluminum

--

0.35

Carbon

--

0.10

Manganese

--

0.50

Molybdenum

5.00

6.50

Titanium

2.80

3.10

Copper

--

0.50

Description

A nickel-iron-chromium alloy containing titanium and aluminum for precipitation hardening and molybdenum for solid-solution strengthening. The alloy has high yield strength and creep resistance at temperatures to about 1110°F (600°C). A substantial iron content enables the alloy to combine high strength with good forging characteristics. Used in gas turbines for discs and shafts. Standard products form is round.


Corrosion Resistance

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.


Heat Treatment

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.


Workability

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.


Typical Mechanical Properties

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

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

Incoloy 901 - Current Inventory Stock