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DUPLEX 1.4462

The alloy of austenite and ferrite makes a form of stainless steel (SS) called Duplex.

Duplex and Hastelloy bolts

WHAT IS 1.4462?

The alloy of austenite and ferrite makes a form of stainless steel (SS) called Duplex. This is also known by working material number 1.4462. There are a number of advantages of work material number 1.4462 in bolts over standard stainless steel:

  • It can handle higher tensile strength as standard stainless steel.
  • In addition, these bolts offer better resistance to localized corrosion compared to standard stainless steels.
  • A higher PREN value to prevent pitting corrosion.

Although there are some alternatives with equivalent characteristics to 1.4462 bolts, this work material number has less cost in production making its use very cost-effective.

  • Oil and gas industry;
  • Chemicals and petrochemicals;
  • Bio-industry;
  • Food industry;
  • Marine applications;
  • Water treatment and desalination plants;
  • Paper processing industry.


By choosing a suitable composition, it is possible to produce stainless steel grades with a structure consisting of both ferrite and austenite. This group of stainless steel grades is known as Duplex stainless steel. The ratio of ferrite to austenite is approximately 50:50. Compared to austenitic stainless steel grades, Duplex is particularly characterized by good mechanical properties combined with high corrosion resistance (up to a temperature of about 315ºC). The 1.4462 metals are also easy to weld and machine. Therefore, they are widely used in the following applications, among others:


In short, do you want to use fasteners in your project? Peco Douwes is your partner of choice. All our products are available in all sizes in any material. Our specialists will be happy to discuss your requirements and delivery options. If you would like to order one or more of our products in Duplex, please contact us. Also if you want to use another material, Peco is the partner for you. Also take a look at our information about Super Duplex - 1.4501.



Does your project require customization? Custom-made special fasteners are among our options. Please contact our product specialists for this.