Alloy 926 / 1.4529

Alternative and trade names
SixMo®, Ultra 6XN®, AL-6XN®, Cronifer 1925hMo®
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Description

The austenitic stainless steel 6Mo was developed on basis of Alloy 904l / 1.4539. However, the molybdenum content at 6Mo was raised to 6.5%.

Related Standards

Equivalent Materials

This material data has been provided by Hempel Special Metals.

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

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.1 g/cm³

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Chemical properties

PropertyValueComment

Carbon

0.02 %

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max.

Chromium

20 - 21 %

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Copper

0.8 - 1 %

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Iron

Balance

Manganese

1 %

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max.

Molybdenum

6 - 6.8 %

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Nickel

24.5 - 25.5 %

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Nitrogen

0.18 - 0.2 %

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Phosphorus

0.03 %

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max.

Silicon

0.5 %

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max.

Sulfur

5E-3 %

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max.

Technological properties

Property
Application areas

1.4529 is mainly in following applications:


  • Concentration and crystallization plants for salt production by evaporation
  • Condenser pipes and pipeline systems in power plants with highly polluted cooling water
  • Pump rods for oil delivery systems
  • Evaporators, heat exchangers, tank linings etc. and phosphoric acid production
  • Tanks for transport of aggressive chemical products
  • Distribution systems and coolers for sulfuric acid plants
  • Fire extinguishing systems, seawater filtration, hydraulic and injection systems of offshore technology
  • Flexible pipes in the offshore industry
  • Flue gas desulphurisation plants (FGD)


    Approval for pressure vessels with temperatures between -196 and 400 ° C

    Building construction approval for components and fasteners made of stainless steel, German Institute of Structural Engineering, September '98

  • Corrosion properties

    6Mo has excellent general corrosion resistance and improved resistance to pitting and crevice corrosion. The resistance to stress corrosion cracking is also increased. It is often referred as super austenitic stainless steel. Generally it has the following corrosion properties:


  • Increased resistance to stress corrosion cracking compared to other austenitic stainless steels
  • excellent general corrosion resistance in use of ​​oxidizing as well as reducing media
  • less tendency to form intermetallic phases compared to similar steels with only 18% nickel content
  • very good resistance at pitting and crevice corrosion

  • Hot forming

    The material is hot formed within a temperature range of 1200 and 900 ° C and afterwards quenched rapidly in water or air.

    The annealing tALes place at 1200 ° C.

    After hot forming, heat treatment for optimum corrosion resistance is recommended.

    Other

    The material Alloy 6XN (UNS N08367) was developed in the USA. This has an almost identical composition and is used in the same applications. However, this material is not listed in the VdTÜV sheet and does not have its own Werkstoffnummer. An use in European pressure applications is therefore difficult.

    The almost identical material is once used in Europe as 1.4529 and in the USA as UNS N08367. At Hempel, we have therefore stocked the material with double certification so that it can be used internationally.