Acidur 4435 +AT

Alternative and trade names
Acidur 4435, 1.4435, Niro-Cut, Type 316L, F316L, X2CrNiMo18-14-3
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Description

1.4435 (X2CrNiMo18-14-3) is an Austenitic chromium-nickel-molybdenum stainless steel with a low C content. Due to its resistance to many forms of corrosion and the excellent surface quality that can be achieved, Acidur 4435 is frequently used in medical technology. Furthermore, this grade is also used in the fittings industry.

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

PropertyValue

Density

7.98 g/cm³

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Dimension

PropertyValueComment

Diameter

250 mm

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max.

Mechanical

PropertyTemperatureValue

Charpy impact energy, V-notch

100.0 J

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Elastic modulus

20 °C

200 GPa

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100 °C

194 GPa

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200 °C

186 GPa

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300 °C

179 GPa

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400 °C

172 GPa

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500 °C

165 GPa

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Hardness, Brinell

215.0

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Hardness, Rockwell C

22.0

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Tensile strength

500.0 - 700.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000160 1/K

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for 20°C to the mentioned temperature

200 °C

0.0000165 1/K

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for 20°C to the mentioned temperature

300 °C

0.000017 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000175 1/K

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for 20°C to the mentioned temperature

500 °C

0.000018 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

500.0 J/(kg·K)

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Thermal conductivity

15 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

7.5e-07 Ω·m

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Chemical properties

PropertyValue

Carbon

0.03

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Chromium

17.0 - 19.0 %

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Manganese

2.0

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Molybdenum

2.5 - 3.0 %

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Nickel

12.5 - 15.0 %

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Nitrogen

0.1

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Phosphorus

0.045

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Silicon

1.0

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Sulfur

0.03

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Technological properties

Property
Application areas

Chemical industry, Electronic equipment, Crude oil and petrochemical industries, Medical and pharmaceutical industry

Corrosion properties

Very Good - 1.4435 displays excellent resistance to corrosion in most natural waters (urban, rural and industrial), even at moderate chloride and salt contents. In the food, beverage and agricultural sectors, 1.4435 displays excellent corrosion properties. This grade of stainless steel is also resistant to corrosion in various acid environments. Due to its low carbon content, 1.4435 is still resistant to intergranular corrosion after welding, i.e. in the sensitised condition. Corrosion testing in accordance with the following corrosion testing specifications, is thus sufficient to establish resistance to corrosion: AFNOR NF 05-159, ASTM A262-75. Practice E, DIN EN ISO 3651-2. The higher molybdenum addition compared to 1.4404, makes 1.4435 more resistant to corrosion in reducing acids and chloride containing media. (PREN = 25.3 – 30.7)

General machinability

Average - For applications which require machining, the NIRO-CUT 4435 grade is recommended since the composition and production route followed to produce this grade compensates for the work hardening tendency of the material. Due to the low carbon content and stable microstructure, NIRO-CUT 4435 can be readily machined.

Heat Treatment

Solution annealing: 1020-1120°C (water, air) fast cooling

Hot forming

It is formable at 900-1200°C

Processing history

Solution Annealed

Welding

Excellent - 1.4435 is readily weldable using all welding processes. Should a filler material be required, Novonit 4430, can be used. Maximum inter-pass temperature during welding is 150°C. Heattreatment after welding is not necessary, and even large sections are resistant to intercrystalline corrosion after welding, due to the low carbon content. Any scale or heat tint that results from welding or high temperature processing must either be mechanically or chemically removed followed by a suitable passivating treatment to restore the corrosion resistance.