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Corrodur 4418

Alternative and trade names
1.4418
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Description

Corrodur 4418 is characterised by its very good resistance to corrosion in aggressive media coupled with very good mechanical and impact properties.

Properties

Mechanical

Charpy impact energy aK,charpy

42 J at -40 °C

min

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Charpy impact energy, transverse aK,charpy,Trans

60 J at 20 °C

min

Elongation A5 A5

16 % at 20 °C

min

Elongation A5, transverse A5,trans

14 % at 20 °C

min

Tensile strength Rm

1000 - 1100 MPa at 20 °C

Tensile strength, transverse Rm,trans

1000 - 1100 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

750 MPa at 20 °C

min

Yield strength Rp0.2, transverse Rp0.2,trans

750 MPa at 20 °C

min

Thermal

Coefficient of thermal expansion α

1.081E-5 1/K at 100 °C

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Chemical properties

Element

Weight %

Comment

Fe

-

balance

Cr

15 - 17 %

Ni

4 - 6 %

Mn

1.5 %

max

Mo

0.8 - 1.5 %

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Technological properties

Application areas

Chemical industry, Ship Building, Mechanical Engineering, Aviation and Aerospace industry

Corrosion properties

Good - Due to its higher alloy content, 1.4418 is more resistant to corrosion than 1.4057 and the addition of molybdenum allows limited exposure to marine environments. As a result of its chemical composition and microstructure, 1.4418 is extremely resistant to intergranular corrosion, corrosion fatigue and stress corrosion cracking.

General machinability

Poor - The machinability of this grade of stainless steel is directly related to its hardness. 1.4418 machines similar to carbon steels of the same hardness. Although it must be realised that the machining parameters will vary depending on the heat treated condition and hardness of the steel.

Processing history

Quenched and tempered QT 900

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

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.