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Acidur 4057

Alternative and trade names
1.4057, Type 431, SUS 431
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Description

1.4057 is most commonly used in applications where the 12% chromium steels do not exhibit sufficient resistance to corrosion or when the toughness of the 12 % martensitic stainless steels is not sufficient.

Properties

Mechanical

Charpy impact energy aK,charpy

27 J at 20 °C

min

Elongation A2 A2

15 % at 20 °C

min

Elongation A5 A5

14 % at 20 °C

min

Hardness, HBW HBW

321 [-] at 20 °C

max

Reduction of area Z

45 % at 20 °C

min

Tensile strength Rm

800 - 950 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

620 MPa at 20 °C

min

Thermal

Coefficient of thermal expansion α

1.051E-5 1/K at 20 °C

Chemical properties

Element

Weight %

Comment

Fe

-

balance

Cr

15 - 17 %

Ni

1.25 - 2.5 %

Mn

1 %

max

Si

1 %

max

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Technological properties

Application areas

Automotive industry, Chemical industry, Aerospace industry, Petrochemical industry, Mechanical engineering

Corrosion properties

Average - Good corrosion resistance in moderately corrosive environments that are free of chlorides, such as soaps, detergents and organic acids. Good resistance to water and steam. 1.4034 is not resistant to intergranular corrosion in the as-delivered or as-welded conditions. Due to the precipitation of chromium carbides and the formation of chromium depleted regions adjacent to these precipitates, 1.4034 should not be used in the soft annealed or over tempered conditions if corrosion resistance is an issue. Optimal corrosion resistance is thus achieved in the hardened condition with a polished surface finish.

General machinability

Poor - The machinability of this grade of stainless steel is directly related to its hardness. 1.4057 machines similar to carbon steels of the same hardness. Although it must be realised that the machining parameters will vary depending on the structure/hardness of the steel

Processing history

Quenched and tempered QT 800

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.