1.8519 (KHD)

Description

1.8519 is a CrMoV-alloyed nitriding steel with a surface hardness after nitriding of minimum 800 HV.

APPLICATION AREAS

Spindles loaded up to highest pressure, screws,

controlling parts, bolts, crankshafts.

Technical Details

Chemical composition

Code: 1.8519, KHD, 31CrMoV4

Carbon	Chromium	Molybdenum	Vanadium
C	Cr	Mo	V
0,31	2,50	0,20	0,15

Heat treatment

	Temperature	Cooling	Cooling
Soft annealing	680 – 720°C	Furnace
Normalizing	870 – 900°C	Air
Hardening	840 – 880°C	Oil, Water	See Tempering Diagram

Mechanical Properties

Mechanical Properties	27 – 33	HRC
Tensile strength	850 – 1300	N/mm²
Yield strength	600 – 900	kN/mm²
Modulus of elasticity L=5D	9 – 12	%
Toughness	25 – 40	CVN (J)

Physical Properties

Coefficient of thermal expansion	12,1 – 13,6	1/K * 10^-6
Thermal conductivity (20°C)	25,7	W/mK
Density	7,80	g/cm³

APPLICATION AREAS

Technical Details

Chemical composition

Code: 1.8519, KHD, 31CrMoV4

Carbon

Chromium

Molybdenum

Vanadium

C

Cr

Mo

V

0,31

2,50

0,20

0,15

Heat treatment

Temperature

Cooling

Cooling

Soft annealing

680 – 720°C

Furnace

Normalizing

870 – 900°C

Air

Hardening

840 – 880°C

Oil, Water

See Tempering Diagram

Mechanical Properties

Mechanical Properties

27 – 33

HRC

Tensile strength

850 – 1300

N/mm2

Yield strength

600 – 900

kN/mm2

Modulus of elasticity L=5D

9 – 12

%

Toughness

25 – 40

CVN (J)

Physical Properties

Coefficient of thermal expansion

12,1 – 13,6

1/K * 10-6

Thermal conductivity (20°C)

25,7

W/mK

Density

7,80

g/cm3

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N/mm²

kN/mm²

1/K * 10^-6

g/cm³