1.4057 (X17CrNi16-2) Material Data Sheet

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1.4057 (X17CrNi16-2) directly from stock & cut to your required dimensions

International identifiers
AISI431, BS431S29, GOST20Ch17N2, SUS431, UNE F.3427, SS2321, UNS S43100, SAE431, AFNOR Z15CN16-02

1.4057 is a rust- and acid-resistant, martensitic chromium steel with nickel addition. The formation of chromium carbides and the associated chromium-depleted regions make this grade susceptible to intergranular corrosion.

1.4057 is also known as AISI 431​​​​​.

Application areas

The main field of application of this stainless steel is the mechanical engineering, as a thrust washer or in the petroleum and petrochemical industry. Further applications from the 1.4057 in power plant construction, in the automotive industry and in the aviation.

1.4057 is available in QT800 and QT900:

Tensile strength Rm800 - 950 N/mm2 900 - 1050 N/mm2 
Brinell hardness251 - 299 HB

284 - 331   HB


1.4057 material data sheet

[Translate to Englisch:] 1.4057 Werkstoffdatenblatt Download

Machinabilityaverage 5 (1 = poor - 10 = good)
Corrosion class2 (0 = weak - 5 = good)


Special features:

  • suitable for high-gloss polishing

  • can be use in a temperature range between -40°C and 400°

Heat treatment

 Temperature in °CCooling
Hot forming1.100 - 800Furnace, slow cooling
Heat treatment  
Soft annealing (+ A)680 - 800Furnace, air
Tempering (+ QT)  
Hardening950 - 1050Oil, air or polymer
Annealing QT800750 - 800 + 650 - 700Water or air
Annealing QT900600 - 650Water or air


Welding: The steel 1.4057 is weldable after preheating to 100°C - 300°C under certain precautions. Cooling to below 200°C must be avoided during welding. As additional materials for welding the 1.4370 and 1.4430 can be used if the weld does not have high strength. Hydrogenous or nitrogenous gas should not be used. Tempering colors must be removed chemically or mechanically.

Forging: 1.4057 is slowly heated to 850°C for forging. Heating takes place quickly at 1150°C - 1180°C. Thereafter forged in a temperature range between 1180°C and 950°C. This is followed by slow cooling.

Cold forming: The material 1.4057 can be deformed, punched and cold-worked to a certain point.

Corrosion resistance: The material quality is susceptible to intergranular corrosion due to the formation of chromium carbides.


Cold forming              is possible
Spent processingis possible
Cold divingnot typical
Free-form and drop forgingrarely


Physical Properties:

Density in kg/dm37,0
Electr. Resistance at 20°C (Ω mm2 /m)0,7
Thermal conductivity at 20°C in W/(m K)25
Specific heat capacity at 20°C in J/(kg K)460


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Chemical composition
min.0,12    15,0 1,5   
max.0,221,01,50,040,01517,0 2,5   
In stock

flat, forged, quenched and tempered

Advantages of saw cut

The processing with the saw is a mechanical processing of the material, which results in a significantly lower unintended deformation and increased hardness for the existing structure, such as the thermal cutting. Thus, the machined workpiece has a homogeneous structure even at the edge, which does not change in the continuation of the material.

This circumstance allows immediate finishing of the workpiece with milling or drilling . So it is not necessary to anneal the material or make a similar operation beforehand.

The most important questions and answers about the material 1.4057:

Ist 1.4057 magnetisch?

1.4057 ist ein ferromagnetischer Werkstoff, also magnetisierbar.

Ist 1.4057 schweißbar?

1.4057 lässt sich schweißen mittels definierter Technologie, in Abhängigkeit vom Eigenschaftszustand und vorgewärmt mit entsprechenden Schweißzusatzwerkstoffen.

Wie ist die Härte von 1.4057?

Der Härtebereich beim Material 1.4057 liegt von 250 bis über 330 HB.

Wie ist die Korrosionsbeständigkeit von 1.4057?

Als korrosionsbeständiger Stahl kann 1.4057 in Umgebungen mit Lebensmitteln oder Seifenlösungen verwendet werden.

Wie ist die zugfestigkeit von 1.4057?

Die Zugfestigkeit vom 1.4057 wird über die Wärmebehandlung in einem Bereich von über 800 – 1100 MPa eingestellt.

Kann 1.4057 rosten?

1.4057 ist ein korrosionsbeständiger Werkstoff, kann jedoch unter bestimmten extremen Umgebungseinflüssen auch rosten.

Do you have any questions?

We are happy to answer your questions and make you an offer for these and other materials. Contact us now for more information.

Yoseli Gättner

Your contact person Yoseli Gättner+49 (0) 35263-665-19

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Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!


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