​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Outokumpu Dura range

High hardness​

  • ​​Heat treatable for greater hardness and strength
  • ​​Martensitic and precipitation-hardening stainless steels with high hardness
  • Used for applications like high-quality knives, scalpels, and aircraft landing gear
  • Usually sold in the solution annealed condition and then heat treated by the user

Dura 420/4021 Dura 420/4031
Dura 420/4034 Dura 4122
Dura 410/4006 Dura 4110
Dura 4024 Dura 4116
Dura 4120 Dura 17-7PH*
Dura 420/4028 Dura 17-4PH*
Dura 4419 Dura 15-17PH
Typical applications
Professional and high quality kitchen knives
Blades in food processing equipment
Shears and surgical instruments
Valves, axles, pump parts, and nozzles
Wear-resistant surfaces
Press plates
Brake discs
*17-4-PH and 17-7 PH are registered trademarks of AK Steel Corporation​​​.​

​​Compare product performance​​​​

​Produ​ct properties​

 Corrosion resistance

​​In general, the corrosion resistance of martensitic stainless steels varies considerably depending on chemical composition, surface finish, and especially heat treatment. Smooth polished surfaces experience higher resistance than rougher finishes. In terms of heat treatment, the hardened condition is more favorable. Tempering may lead to carbide precipitation, which impairs corrosion resistance.

Precipitation hardening stainless steels have higher corrosion resistance than heat treatable martensitic stainless steels.

For more information

Check Stainless Steel Finder to find corrosion information by products in the Outokumpu Dura range​

Check the online corrosion tables and search by chemical name, formula corrosion rates or alphabetically for stainless steel products.

Find an Outokumpu sales office near you to get the printed version of the Outokumpu Corrosion Handbook​​​​​​​​​​


Martensitic and precipitation hardening stainless steels are heat treatable and can therefore provide a wide range of different hardnesses and strengths. For formability purposes they are supplied in a solution-annealed condition. The downstream manufacturer performs final heat treatment to achieve the required mechanical properties.


​Traditional martensitic steels with carbon content greater than 0.20% are difficult to weld and assistance is advised. The hardenable high-carbon grades are not suitable for welding.

Outokumpu assists users and fabricators in the selection, qualification, installation, operation, and maintenance of Dura range products.

More information is available in the Outokumpu Welding Handbook, available from our Outokumpu sales offices

 Forms & dimensions

​​The available forms for Outokumpu Dura range products can include: ​​
To see the forms available for a specific product or to get information about dimensions, check Stainless Steel Finder​​​​​​​​​​​​​

 Standards and approvals

  • ​​ASME SA­240M Code Sect. II. Part A
  • ASTM A240/A240M
  • ASTM A240M
  • EN 10088­2
  • EN 10088­4

Certificates and approvals

  • ​​AD 2000 Merkblatt
  • Approval of Material Manufacturers
  • Factory Production Control Certificate
  • ISO 9001
  • ISO 14001
  • ISO 50001
  • ISO/TS 16949
  • OHSAS 18001
  • Pressure Equipment Directive (PED)



  • Range brochure​​​​​​​ (.pdf) ​​​
  • Range datasheet​​​​​​​ (.pdf) ​​​​​​

Stainless steel finder

Stainless Steel Finder is a tool for easily comparing and finding details of all Outokumpu stainless steel grades​​​​

Go to Steel Finder