A-286 TECHNICAL DATA

Type Analysis | Description | Applications | Corrosion Resistance | Physical Properties | Workability | Typical Mechanical Properties


Type Analysis

Element

Min

Max

Carbon

--

0.08 max

Manganese

--

2.00 max

Silicon

--

1.00 max

Chromium

13.50

16.00

Nickel

24.00

27.00

Molybdenum

1.00

1.75

Iron

--

Balance

Titanium

1.90

2.30

Vanadium

0.10

0.50

Aluminum

--

0.35 max

Boron

0.003

0.010

Description

Alloy A-286 is designed for applications requiring high strength and good corrosion resistance at temperatures up to 1300 °F(704 °C). This alloy offers high ductility in notched sections. In fact, the notched rupture strength of alloy A-286 is superior to many other commercial alloys with comparable high temperature properties. An advantage of this alloy is that it can be precipitation hardened and strengthened by heat treatments. This makes possible a high degree of uniformity in developing maximum strength, which can be duplicated application after application.


Applications

Alloy A-286 has been used in jet engines,superchargers and various high temperature applications such as turbine wheels and blades,frames,casings,afterburner parts and fasteners.


Corrosion Resistance

The corrosion resistance of this alloy is excellent up to 1300 °F(704 °C) against many atmospheres encountered in jet engine service. Up to 1800 °F(982 °C), the oxidation resistance of alloy A-286 is equivalent to that of Type 310 stainless.


Physical

Density
lb/cu in.................... 0.286
kg/cu m ...................... 7916

Melting range
°F................................. 2500/2600
°C................................. 1371/1427

Modulus of elasticity

Temperature

psi x 10(6)

MPa x 10(3)

Deg F

Deg C

70

21.1

28.8

199

1000

538

23.7

163

1100

593

22.8

157

1200

649

21.9

151

1300

704

21.1

145

1400

760

20.1

139

1500

816

18.7

129


Specific heat
Btu/lb-°F(104/1299 °F).......................... 0.110
kJ/kg-K(40/704 °C)................................ 0.461

Mean coefficient of thermal expansion

Temperature

Coefficient

°F

°C

10-6/°F

10-6/°C

200

93

9.17

16.5

400

204

9.35

16.8

600

316

9.47

17.0

800

427

9.64

17.4

1000

538

9.78

17.6

1200

649

9.88

17.8

1300

704

9.94

17.9

1400

760

10.32

18.6


Thermal conductivity
Btu-in/ft(2)-hr-°F(302 °F)............... 104.2
W/m-k(150 °C)...................................15.0
Btu-in/ft(2)-hr-°F(112 °F)............... 165.0
W/m-k(600 °C)............................... 23.8

Magnetic permeability
Solution treated ...................................1.010
Solution treated and aged....................1.007


Workability

Hot Working/Forging
Alloy A-286 is rolled or forged from temperature of 1900/2050 °F(1038/1121 °C) using a short soaking period. It is slightly more resistance to deformation than the austentitic stainless steels during hot working. Do not forge below 1700 °F(927 °C).

Cold Working
In the solution treated condition,alloy A-286 can be satisfactorily cold drawn and formed. It is somewhat stiffer than stainless steels such as Types 316 and 310,and it work hardens rapidly.

Machinability
In general, the high temperature alloys are more difficult to machine than stainless steels. However, the iron-base alloy group, of which alloy A-286 is a member, is easier to machine than the nickel-based precipitation-hardening grades such as alloy 718 or cobalt-bearing grades such as alloy 41. Carbide insert tools are commonly used where possible.
The following charts contain machining information for alloy A-286:
Turning-Single Point and Box Tools

Condition

Depth
of
Cut In.

High Speed Tools

Carbide

Speed
fpm

Feed
ipr

Tool
Mtl.

Speed fpm

Feed
ipr

Tool
Mtl.

Brazed

Throw
Away

Solution Treated

.100
.025

35
40

.015
.007

M-42

135
160

160
190

.015
.007

C-2
C-3

Aged

.100
.025

30
35

.010
.007

120
140

140
165

.010
.007

C-2
C-3

Turning_Cut-off and Form Tools

Condition

Speed
fpm

Feed, ipr

Tool Mtl.

Cutoff Tool
Width, Inches

Form Tool
Width, Inches

1/16

1/8

1/4

1/2

1

1-½

2

Solution Treated

25
95

.002
.003

.004
.005

.005
.007

.003
.004

.002
.003

.002
.003

.001
.002

M-42
C-2

Aged

20
80

.002
.003

.004
.005

.005
.007

.003
.004

.002
.003

.002
.002

.001
.0015

M-42
C-2

Drilling

Condition

Speed
fpm

Feed, ipr

Tool
Mtl.

Nominal Hole Diameter, Inches

1/16

1/8

1/4

1/2

3/4

1

1-½

2

Solution Treated

25

--

.002

.004

.006

.008

.010

--

--

M-42

Aged

20

--

.002

.004

.006

.008

.008

--

--

Reaming

Condition

High Speed Tool

Carbide Tool

Speed
fpm

Feed Inches Per Rev

Tool
Mtl.

Speed
fpm

Tool
Mtl.

Reamer Diam. Inches

1/8

1/4

1/2

1

1-½

2

Solution Treated

30

.003

.006

.010

.012

.014

.016

M-42

100

C-2

Aged

25

.003

.006

.010

.012

.014

.016

M-42

80

Die Threading

Condition

Speed fpm

Tool Mtl.

7 or
Less

8 to
15

16 to
24

25 and up
T.P.I

Annealed

4-6

5-8

6-10

8-12

M-2; M-7; M-10

Aged

3-4

3-5

4-8

5-10

M-42

Tapping

Condition

Speed fpm

Tool Mtl.

Solution Treated

10

M-1; M-7; M-10

Aged

7

M-1; M-7; M-10; Nitrided

Milling--End-Peripheral

Condition

Depth
of
Cut In.

High Speed Tools

Carbide Tools

Speed
fpm

Feed-Inches per tooth

Tool
Mtl.

Speed
fpm

Feed-Inches per tooth

Tool
Mtl.

Cutter Diam. inches

Cutter Diam. inches

1/4

1/2

3/4

1-2

1/4

1/2

3/4

1-2

Solution Treated
Aged

.050

30
20

.002
.002

.002
.002

.003
.003

.004
.004

M-42

120
80

.001
.001

.002
.002

.003
.003

.004
.004

C-2


Typical Mechanical Properties

Tensile Properties
Tests on 7/8"(22.2mm) diameter bar stock solution treated to 1800 °F(982 °C), 1 hour, oil quenched,aged 1325 °F(719 °C), 16 hours, air cooled.

Test
Temperature

0.02% Offset
Yield Strength

0.2% Offset
Yield Strength

Tensile
Strength

%
Elongation
in 2"
(50.8 mm)

%
Reduction
of Area

°F

°C

ksi

MPa

ksi

MPa

ksi

MPa

70

21.1

90

621

95

655

145

1000

24.0

45.0

400

204

76

524

93.5

645

143

986

21.5

52.0

800

427

72

496

93

641

138

951

18.5

35.0

1000

538

62

427

87.5

603

131

903

18.5

31.0

1100

593

64.5

445

90

621

122

841

21.0

23.0

1200

649

62.5

431

88

607

103.5

714

13.0

14.5

1300

704

68.5

472

86

593

86.5

596

11.0

10.0

1400

760

44.5

307

62

427

64

441

18.5

23.0

1500

816

31

214

33

228

36.5

252

68.5

37.5

Note: Approximately 10 ksi higher strength and increased elongation may be obtained with 1650 °F(899 °C)solution treatment and 1325 °F(718 °C) age.

Stress Rupture Properties
Solution treated 1800 °F(982 °C), 1 hour, oil quenched, aged 1325 °F(718 °C), 16 hours, air cooled.

Test
Temperature

Stress for Rupture

°F

°C

100 Hours

%
Elongation
in 4D

1000 Hours

%
Elongation
in 4D

ksi

MPa

ksi

MPa

1000

538

99

683

3.0

88

607

3.0

1100

593

81.5

562

3.0

71.5

493

3.0

1200

649

61*

421

5.0

46***

317

8.5

1300

704

44.5

307

12.0

29

200

30.0

1350

732

35**

41

29.0

21

145

35.0

1500

816

13

90

55.0

7.7

53

----

Note: Comparative values for 1650 °F(899 °C),1 hour,oil quenched and 1325 °F(718 °C),16 hours,air cooled

*53ksi,**32 ksi,***39 ksi


A286 - Current Inventory Stock

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