铝合金 2024 板材信息

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A L L O Y D E S C R I P T I O N

2024 is heavily utilized in aircraft applications because it has good machining characteristics and higher strength than either 2014 and 2017. Though cold formability is considered fair, it is one of the most popular alloys for cold heading and thread rolling applications as a result of the superior grain structure that can be obtained. Corrosion resistance and anodizeablilty are only fair. It is also the basic alloy for cold finished square and rectangular bar. Again, this is because of its high strength and good machinability, which are essential for precision fittings and parts.

T Y P I C A L M E C H A N I C A L P R O P E R T I E S

Temper

Tensile (.500" Dia. Specimen)

Hardness

Shear

Fatigue*

Modulus

 

 

Ultimate

 

Yield

 

Elongation/4D

Brinell 500kg 10 mm

Ultimate Shearing Strength

 

Endurance Limit -

R.R. Moore Type

 

Modulus of Elasticity

KSI

MPa

KSI

MPa

%

 

KSI

MPa

KSI

MPa

KSI x 103

Gpa

0

27

186

11

76

22

47

18

124

13

90

10.6

73.1

T4, T351

68

469

47

324

19

120

41

283

20

138

10.6

73.1

T361

72

496

57

393

13

130

42

290

18

124

10.6

73.1

T851

65

448

60

414

6

 

40

276

 

 

10.6

73.1

T861

70

483

66

455

6

 

42

290

 

 

10.6

73.1

*5 x 10E8 cycles of reversed stress

 

C O M P A R A T I V E C H A R A C T E R I S T I C S

Temper

Corrosion Resistance

Cold Workability3

Machinability3

Anodize Response3

Brazeability4

Weldability4

 

General1

Stress2

 

 

 

 

Gas

Arc

Spot

T4,T351

D

C

C

B

C

D

C

B

B

T361

D

C

D

B

C

D

D

C

B

T861, T851

 

D

 

B

 

D

 

B

 

C

 

D

 

D

 

C

 

B

 

1       Ratings A through E are relative ratings in decreasing order of merit, based on exposures to sodium chloride solution by intermittent spraying or immersion. Alloys with A and B ratings can be used in industrial and seacoast atmospheres without protection. Alloys with C, D and E ratings generally should be protected at least on faying surfaces.

2       Stress-corrosion cracking ratings are based on service experience and laboratory tests of specimens exposed to the 3.5% sodium chloride alternate immersion test. A= No known instance of failure in service or in laboratory tests.

B= No known instance of failure in service; limited failures in laboratory tests of short transverse specimens.

C= Service failures with sustained tension stress acting in short transverse direction relative to grain structure; limited failures in laboratory tests of long transverse specimens.

D= Limited service failures with sustained longitudinal or long transverse

3       Ratings A through D for Workability (cold), A through E for Machinability and A through C for Anodize Response, are relative ratings in decreasing order of merit.

4       Ratings A through D for Weldability and Brazeability are relative ratings defined as follows: A= Generally weldable by all commercial procedures and methods.

B= Weldable with special techniques or for specific applications that justify preliminary trials or testing to develop welding procedure and weld performance. C= Limited weldability because of crack sensitivity or loss in resistance to corrosion and mechanical properties.

D= No commonly used welding methods have been developed.

 

 

 

 

 

 

 

C H E M I C A L C O M P O S I T I O N L I M I T S

Continued Page 2 of 2

 

 

Others

Weight %

Si

Fe

Cu

Mn

Mg

Cr

Zn

Ti

Each

Total

Minimum

-

-

3.8

0.30

1.2

-

-

-

-

-

Maximum

0.50

0.50

4.9

0.9

1.8

0.10

0.25

0.15

0.05

0.15

 

T Y P I C A L P H Y S I C A L P R O P E R T I E S

Characteristic

 

English

Metric

Nominal Density (68 °F/20 °C)

 

0.100 lbs./in.3

2.77 Mg/m3

Melting Range

 

935 °F - 1180 °F

502 °C - 638 °C

Specific Heat (212 °F/100 °C)

 

0.209 BTU/lb. - °F

875 J/kg - °K

 

 

 

Coefficient of Thermal Expansion

 

Linear

68 °F-212 °F

20 °C-100 °C

 

12.7 micro in./in.-°F

 

22.9 micro m/m -°K

 

Volumetric 68 °F/20 °C

 

3.67 x 10-5in.3/in.3 -°F

 

66 x 10-6m3/m3 -°K

 

 

Thermal Conductivity (68 °F/20 °C)

O Temper

110 BTU/ft. - hr. - °F

190 W/m - °K

T4, T351, T451

69 BTU/ft. - hr. - °F

120 W/m - °K

T651

88 BTU/ft. - hr. - °F

151 W/m - °K

 

 

 

Electrical Conductivity (68 °F/20 °C)

 

Equal Volume

O Temper

50% IACS

T451

30% IACS

T651

38% IACS

 

Equal Weight

O Temper

160% IACS

T451

96% IACS

T651

122% IACS

 

2020年8月12日 17:00
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