Nitrodur 8550 QT

Alternative and trade names
Nitrodur 8550, 1.8550, 34CrAlNi7-10
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Description

1.8550 (34CrAlNi7-10) is a nitriding steel used in automotive and mechanical industry for heat-treated parts which the surface needs to have high wear resistance.

Related Standards

Equivalent Materials

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyValue

Density

7.6 g/cm³

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Dimension

PropertyValueComment

Diameter

250 mm

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max.

Mechanical

PropertyValueComment

Charpy impact energy, V-notch

30 - 35 J

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Elastic modulus

210 GPa

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Elongation

10 - 13 %

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A5

Hardness, Brinell

248 [-]

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annealed

Tensile strength

800 - 1100 MPa

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Yield strength

600 - 680 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

1.11e-05 1/K

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for 20°C to the mentioned temperature

200 °C

1.21e-05 1/K

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for 20°C to the mentioned temperature

300 °C

1.29e-05 1/K

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for 20°C to the mentioned temperature

400 °C

1.35e-05 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

420 J/(kg·K)

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Thermal conductivity

42.6 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

1.9e-07 Ω·m

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Chemical properties

PropertyValue

Aluminium

0.8 - 1.2 %

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Carbon

0.3 - 0.37 %

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Chromium

1.5 - 1.8 %

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Iron

Balance

Manganese

0.4 - 0.7 %

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Molybdenum

0.15 - 0.25 %

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Nickel

0.85 - 1.15 %

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Phosphorus

0.025 %

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Silicon

0.4 %

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Sulfur

0.035 %

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Technological properties

Property
Application areas

It is used in Automotive and Mechanical engineering for heat-treated components which have been subjected to very high wear stresses, such as cam plates, eccentrics or pinion shafts.

Heat Treatment

Soft annealing: 650-700°C (Slow furnace cooling down), Quenching: 870-930°C (Oil, Water, Polymer), Tempering: 580-700°C (Air), Nitriding: 480-570°C

Hot forming

It is formable at 850-1050°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.