Acidur 4404 +AT

Alternative and trade names
Acidur 4404, 1.4404, Type 316L, X2CrNiMo17-12-2
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Description

1.4404 (X2CrNiMo17-12-2) is one of the common corrosion-resistant stainless steels. Due to its molybdenum content, it offers a high degree of resistance against non-oxidising acids and halogenated media. It is easy to process and can be used at temperatures up to 550°C. It is also polishable and resistant to intergranular corrosion till 300°C.

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

8.0 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

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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

16.5 - 18.5 %

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Manganese

2.0

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Molybdenum

2.0 - 2.5 %

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Nickel

10.0 - 13.0 %

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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, Pharmaceutical Industry, Food Industry, Fittings, Construction, Ship Building & Marine Structures, Petrochemistry, Automotive, Decorative Applications, Kitchen Equipment, Electronics, Aerospace, Maritime

Cold Forming

It is suitable for cold forming according to DIN EN 10263-5.

Corrosion properties

Due to the molybdenum content has a higher corrosion resistance thatn Acidur 4301 and 4307 (specially in chloride mediums). Due to its low carbon content it is resistant against intergranular corrosion according to DIN EN 3651 part 2. PREN= 23.1-28.8

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

It is weldable with or without filler material (e.g. 1.4430). The interpass temperature should not exceed 200°C. Subsequent heat treatment is not require. The resistance to intergranular corrosion is not affected by welding according to DIN EN 3651 part 2.