Acidur 4462 +AT

Alternative and trade names
Acidur 4462, 1.4462, F51, F60, UNS S31803, S32205, SUS329J3L, X2CrNiMoN22-5-3
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Description

1.4462 belongs to the family of dulpex stainless steels. This steel is characterised by its excellent combination of corrosion resistance, comparable to that of the austenitic grade 1.4404, and strength, about 150 % higher than that of the 1.4404 austenitic grades.


The use of duplex stainless steels, especially 1.4462 are gaining popularity due to their unique combination of excellent corrosion resistance, resistance to stress corrosion cracking and high tensile and yield strengths. As a result of its high strength, this steel is ideally suited to the constructional industry. The relatively lower nickel content, relative to the conventional austenitic grades, also makes 1.4462 an interesting alternative from an economic point of view.

Related Standards

Equivalent Materials

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.

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Properties

General

PropertyValueTemperature

Density

7.8 g/cm³

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23.0 °C

Dimension

PropertyValueComment

Diameter

160 mm

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max.

Mechanical

PropertyValueTemperature

Charpy impact energy, V-notch

100 J

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23.0 °C

Elastic modulus

200 GPa

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20.0 °C

194 GPa

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100.0 °C

186 GPa

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200.0 °C

180 GPa

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300.0 °C

Elongation A5

25 %

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23.0 °C

Hardness, Brinell

270 [-]

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23.0 °C

Hardness, Rockwell C

25 [-]

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23.0 °C

Tensile strength

650 - 880 MPa

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23.0 °C

Yield strength Rp0.2

450 MPa

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20.0 °C

360 MPa

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150.0 °C

315 MPa

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200.0 °C

300 MPa

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250.0 °C

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Thermal

PropertyValueTemperatureComment

Coefficient of thermal expansion

1.3E-5 1/K

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100.0 °C

for 20°C to the mentioned temperature

1.35E-5 1/K

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200.0 °C

for 20°C to the mentioned temperature

1.4E-5 1/K

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300.0 °C

for 20°C to the mentioned temperature

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Specific heat capacity

500 J/(kg·K)

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23.0 °C

Thermal conductivity

15 W/(m·K)

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23.0 °C

Electrical

PropertyValueTemperature

Electrical resistivity

7.8E-7 Ω·m

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23.0 °C

Chemical properties

Property

Carbon

0.03 %

Chromium

21 - 23 %

Iron

Balance

Manganese

2 %

Molybdenum

2.5 - 3.5 %

Nickel

4.5 - 6.5 %

Nitrogen

0.1 - 0.22 %

Phosphorus

0.04 %

Silicon

1 %

Sulfur

0.015 %

Technological properties

Property
Application areas

Construction industry, Chemical industry, Petro-chemical industry, Electronic equipment, Food and Beverage industries, Mechanical engineering, Off-shore structures and Ship building

Corrosion properties

Excellent - Superb corrosion resistance in chloride containing and acid environments, especially in phosphoric and organic acids. Corrosion resistance is superior to that of 1.4404. As a result of the duplex structure 1.4462 exhibits superior corrosion resistance to the austenitic grades in that it is not susceptible to intergranular corrosion and also in that this grade of steel is exceptionally resistant to stress corrosion cracking. This stainless steel is also resistant to pitting corrosion, which together with its resistance to stress corrosion cracking accounts for its extensive use in offshore applications. PRE = 30.85 – 38.07

General machinability

Poor - Like all duplex stainless steels, 1.4462 is only machinable with some difficulty. The factors responsible for this are the high strength and duplex structure. The optimal cutting/machining parameters lie within a much narrower band than is the case with the austenitic grades. Coated hard metal cutting/machining tools or the use of Cermets are recommended for the machining of 1.4462.

Heat Treatment

Optimal corrosion and mechanical properties can be obtained by solution annealing the steel at temperatures between 1050 °C und 1100 °C followed by rapid cooling in air or water.

Hot forming

It is formable at 950-1200°C

Processing history

Solution Annealed

Welding

Good - Like all duplex stainless steels, care must be taken when welding 1.4462. The optimal enveope of welding parameters is small and as such deviations outside these optimal limits could lead to poor welds. Within the prescribed welding parameters, weldability is good. The use of slightly higher heat inputs (1 – 3 kJ/mm), during welding is preferable since this results in a better phase distribution in the weld zone, which in turn results in improved mechanical properties of the weldment.