Nitrodur 8523 QT: High-Performance Nitriding Steel for Automotive & Mechanical Applications

1.8523 (40CrMoV13-9) is a nitriding steel and used for parts in automotive and mechanical engineering. Components, such as chain bolts, are subject to high wear loads and are nitrided after processing.

Properties

General

Property	Value
Density	7.7 g/cm³

Dimension

Property	Value	Comment
Diameter	250 mm	max.

Mechanical

Property	Value	Comment
Charpy impact energy, V-notch	25 - 30 J
Elastic modulus	210 GPa
Elongation	11 - 15 %	A5
Hardness, Brinell	248 [-]	annealed
Tensile strength	800 - 1150 MPa
Yield strength	625 - 750 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100 °C	1.11e-05 1/K	for 20°C to the mentioned temperature
	200 °C	1.21e-05 1/K	for 20°C to the mentioned temperature
	300 °C	1.29e-05 1/K	for 20°C to the mentioned temperature
	400 °C	1.35e-05 1/K	for 20°C to the mentioned temperature
Specific heat capacity		470 J/(kg·K)
Thermal conductivity		42.6 W/(m·K)

Electrical

Property	Value
Electrical resistivity	1.9e-07 Ω·m

Chemical properties

Property	Value
Carbon	0.36 - 0.43 %
Chromium	3 - 3.5 %
Iron	Balance
Manganese	0.4 - 0.7 %
Molybdenum	0.8 - 1.1 %
Phosphorus	0.025 %
Silicon	0.4 %
Sulfur	0.035 %
Vanadium	0.15 - 0.25 %

Technological properties

Property
Application areas	It used for parts in Automotive and Mechanical engineering that are subject to high wear loads and are nitrided after processing, such as chain bolts.
Heat Treatment	Soft annealing: 650-700°C (Slow cooling), Quenching: 870-970°C (Oil, Water, Polymer), Tempering: 580-700°C, Nitriding: 480-570°C
Hot forming	It is formable at 850-1100°C and should then cooled slowly.
Processing history	Quenched and Tempered
Welding	It is difficult to weld and should will not used be in welded constructions.

Firmodur 1249 QT Steel – High-Performance Quenched & Tempered Grade for Automotive & Industrial Applications Nitrodur 8550 QT: High-Performance Nitriding Steel for Automotive and Mechanical Applications

Metal