31CrMo12_1.pdf

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Steel

GK3

31CrMo12

Variant:

GK3W: Consumable electrode remelted grade

S PECIFICATIONS

C OMPOSITION

European standards:

- 31CrMo12, 32CrMo12

- Numerical designation: 1.8515, 1.7361

Carbon ..............................................0.30

Chromium ..........................................3.00

Molybdenum......................................0.40

AECMA:

- Designation: FE-PL1501, FE-PL48

- 30CrMo12

A PPLICATIONS

AIR

: 30 CD 12

WL

: 1.8564

• Gears.

• Spindles.

• Extruder screws.

• Machine tool components.

• Various mechanical parts.

• Rack and pinions.

• Shafts etc.

M ECHANICAL PROPERTIES

• Annealed condition: heat to 825 °C followed by slow cooling.

- Brinell hardness:

205

• Oil quench from 900/925 °C. Temper at 625 °C.

- UTS:

C HARACTERISTICS

1000 N/mm 2

- 0.2 % Yield strength:

850 N/mm 2

- Elongation (5d):

18 %

• Nitriding steel exhibiting a relatively ductile

nitrided layer, but with a lower surface hardness

than the Aubert & Duval LK range of steels.

- Impact strength KCU:

150 J/cm 2

1820f

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H EAT TREATMENT

T EMPERING CURVE

• Harden:

- Heat to 900/925 °C.

- Oil quench.

N/mm 2

J/cm 2

%

UTS - 0.2 % YS

N/mm 2

A %: 5d

KCU: J/cm 2

2300

46

460

2200

44

440

42

40

38

36

34

32

30

28

26

24

22

20

18

16

14

12

10

8

6

4

2

0

420

400

380

360

340

320

300

280

260

240

220

200

180

160

140

120

100

80

60

40

20

0

2100

2000

1900

1800

1700

1600

1500

1400

1300

1200

1100

1000

900

800

700

600

500

400

300

200

100

0

• Temper:

- Above 525 °C

depending on properties required.

• Nitriding:

- Surface hardness: approx. 850 Vickers.

UTS

0.2 % YS

P HYSICAL PROPERTIES

• Density:

7.8

A

• Mean coefficient of expansion in m/m.°C:

- between 20 °C and 100 °C:11.3 x 10 -6

- between 20 °C and 500 °C:13.6 x 10 -6

K

• Critical points:

- Ac 1:

500

600

700

780 °C

- Ac 3:

835 °C

Heated to 900/925 °C, oil quenched.

(Heat treatment on rough machined blanks)

F ORGING

• 1100/900 °C

AUBERT & DUVAL

22, rue Henri-Vuillemin • 92230 Gennevilliers - France

Tel: 33 (0)1 55 02 58 00 • Fax: 33 (0)1 55 03 58 01

Internet: http://www.aubertduval.fr • e-mail: dircom@aubertduval.fr

The data provided in this document represent typical or average values rather than maximum or minimum guaranteed values. The applications indicated for the grades described are given as

guidance only in order to help the reader in his personal assessment. Please note that these do not constitute a guarantee whether implicit or explicit as to whether the grade selected is suited to

specific requirements. Aubert & Duval’s liability shall not under any circumstances extend to product selection or to the consequences of that selection.

1820f

GK3

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