Outokumpu Dura range

Heat treatable stainless steels for greater hardness and strength

The Dura range contains Outokumpu's high hardness and precipitation hardening (PH) stainless steel products.

Key grades

Dura 420/4021

A very popular martensitic stainless steel that is corrosion resistant in water and steam. 

Dura 420/4034

A high-hardness martensitic stainless steel that is corrosion resistant in water and steam. 

We believe in the world that lasts forever

Why Dura range

  • Martensitic and precipitation hardening stainless steels provide high hardness, strength and wear resistance for applications demanding certain level of corrosion resistance.  
  • The martensitic products are typically used for edge applications like high-quality knives, scalpels, and the precipitation hardening products for aircraft parts.
  • The Dura range products are usually delivered in solution annealed condition to be further heat treated by the user to reach optimal properties.
  • Why Outokumpu

    • Outokumpu is a global leader in stainless steel, and innovator of the first stainless steels in the world.
    • A strong customer focus, sustainability, and technical excellence are at the heart of everything we do.
    • As a customer you benefit from our strong R&D and technical support

    Why stainless steel

    • The durability of stainless steel means that it is not only the best, but also the most economically sustainable choice for a wide range of applications.
    • All of our products are made from an average of 85% recycled material and are fully recyclable at the end of their lifecycles.

    Outokumpu Dura stainless steel grades

    Dura 420/4021

    Description A very popular martensitic stainless steel that is corrosion resistant in water and steam. 

    EN 1.4021

    ASTM type 420

    ASTM UNS S42000

    Microstructure Martensitic

    Typical applications

    • Cutting utensils
    • Surgical instruments
    • Press plates
    • Brake discs
    • Mechanical parts
    • Flanges and valves

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.20

    Cr 13.0

    Ni -

    Mo -

    N -

    Others -

    Dura 420/4034

    Description A high-hardness martensitic stainless steel that is corrosion resistant in water and steam. 

    EN 1.4034

    ASTM type 420

    ASTM UNS S42000

    Microstructure Martensitic

    Typical applications

    • Professional kitchen knives
    • Surgical instruments
    • Press plates
    • Brake discs

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.45

    Cr 13.7

    Ni -

    Mo -

    N -

    Others -

    Dura 410/4006

    Description A martensitic stainless steel that is corrosion resistant in water and steam. Grade is only available as press plate.

    EN 1.4006

    ASTM type 410

    ASTM UNS S41000

    Microstructure Martensitic

    Typical applications

    • Valves
    • Flanges
    • Axles
    • Pump parts
    • Brake discs

    Product forms

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.12

    Cr 12.0

    Ni -

    Mo -

    N -

    Others -

    Dura 4024

    Description A martensitic stainless steel with slightly better hardenability than Dura 410/4006 that is corrosion resistant in water and steam. 

    EN 1.4024

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Mechanical engineering applications
    • Surgical instruments

    Typical chemical composition, % by mass

    C 0.16

    Cr 13.2

    Ni -

    Mo -

    N -

    Others -

    Dura 4120

    Description Similar to Dura 420/4021 but with improved corrosion resistance and hightemperature strength. 

    EN 1.4024

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Mechanical engineering applications
    • Surgical instruments

    Typical chemical composition, % by mass

    C 0.16

    Cr 13.2

    Ni -

    Mo -

    N -

    Others -

    Dura 420/4028

    Description A martensitic stainless steel that is corrosion resistant in water and steam. 

    EN 1.4028

    ASTM type 420

    ASTM UNS S42000

    Microstructure Martensitic

    Typical applications

    • Cutting utensils
    • Surgical instruments
    • Measuring tools
    • Flanges and valves
    • Wear-resistant mechanical parts

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.30

    Cr 12.5

    Ni -

    Mo -

    N -

    Dura 4419

    Description Similar to Dura 420/4028, but with improved corrosion resistance and high-temperature strength.

    EN 1.4419

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Mechanical engineering applications

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.38

    Cr 13.3

    Ni -

    Mo 0.9

    N -

    Others -

    Dura 420/4031

    Description A martensitic stainless steel with medium-high hardness that is corrosion resistant in water and steam. 

    EN 1.4031

    ASTM type 420

    ASTM UNS S42000

    Microstructure Martensitic

    Typical applications

    • Cutting utensils
    • Surgical instruments
    • Measuring tools
    • Wear-resistant mechanical parts 

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.38

    Cr 13.5

    Ni -

    Mo -

    N -

    Others -

    Dura 4122

    Description Outokumpu’s most corrosion-resistant martensitic stainless steel. Good resistance in moderately corrosive, low-chloride environments and very good mechanical properties and wear resistance. Medium-high hardness. 

    EN 1.4122

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Surgical instruments
    • Food processing equipment
    • Mechanical parts
    • Machine and pump construction

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.41

    Cr 16.1

    Ni -

    Mo 1.0

    N -

    Others -

    Dura 4110

    Description A high-hardness martensitic stainless steel with improved corrosion and wear resistance compared to Dura 420/4034. 

    EN 1.4410

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Knife blades
    • Scissors
    • Surgical cutting tools
    • Measuring tools
    • Pump construction
    • Valves

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.50

    Cr 14.8

    Ni -

    Mo 0.8

    N -

    Others -

    Dura 4116

    Description Similar to Dura 4110 but with elevated wear resistance.

    EN 1.4116

    ASTM type -

    ASTM UNS -

    Microstructure Martensitic

    Typical applications

    • Cutting instruments that undergo partial hardening

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.50

    Cr 14.4

    Ni -

    Mo 0.6

    N -

    Others -

    Dura 17-4PH

    Description A martensitic precipitation hardening steel with high strength and hardness, good corrosion resistance, and satisfactory formability (depending on heat treatment/condition).

    EN 1.4542

    ASTM type 630

    ASTM UNS S17400

    Microstructure Precipitation hardening

    Typical applications

    • Oil field equipment
    • Chemical process equipment
    • Fittings
    • Pump shafts
    • Gears
    • Paper mill equipment
    • Aircraft parts
    • Flanges and valves

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.02

    Cr 15.5

    Ni 4.8

    Mo -

    N -

    Others Nb, Cu

    Dura 17-7PH

    Description A precipitation hardening stainless steel with high strength and hardness, good corrosion resistance, and satisfactory formability (depending on heat treatment/condition). 

    EN 1.4568

    ASTM 631

    UNS S17700

    Microstructure Precipitation hardening

    Typical applications

    • Retaining rings
    • Springs
    • Valves and flanges
    • Gears
    • Aircraft parts

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Typical chemical composition, % by mass

    C 0.08

    Cr 17.0

    Ni 7.0

    Mo -

    N -

    Others Al

    Dura 15-7PH

    Description A precipitation hardening stainless steel with high strength and hardness, good corrosion resistance, and satisfactory formability (depending on heat treatment/condition). 

    EN 1.4574

    ASTM type 632

    ASTM UNS S15700

    Microstructure

    Precipitation hardening

    Typical applications

    • Retaining rings
    • Springs
    • Valves
    • Aircraft parts

    Datasheet Download Dura range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

    Chemical composition

    C 0.08

    Cr 14.5

    Ni 7.5

    Mo 2.2

    N -

    Others 1Al

    Standards and approvals for Dura range

    Dura range stainless steels meet the following standards: 

    ASME SA240M Code Sect. II. Part A
    ASTM A240/A240M

    ASTM A240M

    EN 10088-2

    EN 10088-3

    EN 10088-4

    EN 10088-5

    Outokumpu meets the most common certifications and approvals, including:

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

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