Acidur 4529

Alternative and trade names
1.4529, X1NiCrMoCuN25-20-7, SEL,SEW 400,UNS N08926
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Description

1.4529 (X1NiCrMoCuN25-20-7) is a stainless superaustenitic steel which is optimally prepared for the high requirements in chloride-containing and aggressive media. Due to its high resistance to pitting corrosion and stress corrosion cracking and its good combination of strength and toughness this special steel is ideal for fastening elements.

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.

Ashby charts

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Properties

General

PropertyValue

Density

8.1 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

195 GPa

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100 °C

190 GPa

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200 °C

182 GPa

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300 °C

174 GPa

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400 °C

166 GPa

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500 °C

158 GPa

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Hardness, Brinell

250.0

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Tensile strength

650.0 - 850.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000158 1/K

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for 20°C to the mentioned temperature

200 °C

0.0000161 1/K

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for 20°C to the mentioned temperature

300 °C

0.0000165 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000169 1/K

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for 20°C to the mentioned temperature

500 °C

0.0000173 1/K

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for 20°C to the mentioned temperature

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Max service temperature

400.0

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Specific heat capacity

450.0 J/(kg·K)

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Thermal conductivity

12

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Electrical

PropertyValue

Electrical resistivity

1e-06 Ω·m

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Chemical properties

PropertyValue

Carbon

0.02

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Chromium

19.0 - 21.0 %

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Copper

0.5 - 1.5 %

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Manganese

1.0

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Molybdenum

6.0 - 7.0 %

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Nickel

24.0 - 26.0 %

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Nitrogen

0.15 - 0.25 %

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Phosphorus

0.03

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Silicon

0.5

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Sulfur

0.01

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Technological properties

Property
Application areas

Construction industry (especially tunnel and swimming pool construction), Chemical industry, Decorative purposes and kitchen equipment, Flue gas desulfurization plants, Ship building, Use in sea or brackish water, Medical and pharmaceutical industry

Cold Forming

It can be cold formed, as high forming energy is needed because of the work hardening effect.

Corrosion properties

Excellent - It is resistant against intergranular corrosion according to DIN EN ISO 365 part 1 and 2. Halogen rich media can cause pitting corrosion and stress corrosion cracking. In chloride medium and see water it can resist till 70°C as well as in sulfuric acid and phosphoric acid.

General machinability

Average - Because of the alloying elements it is hard to machine this alloy. The machining shoud be done using high-speed steels or hard metals.

Heat Treatment

Solution annealing: 1120-1180°C (water, air) fast cooling

Hot forming

It is formable at 950-1200°C

Polishing ability

Good

Welding

Good - It is weldable using known processes although it tends to hot crack formation. Welding without a filler is not recommended. As a welding filler duplex materials such as 1.4462 are recommended. Using welding fillers lead to the reduction of corrosion ressitance in the welding region. Nickel alloys are also another filler material that can be used but the interlayer temperature should not go over 150°C.