Heat treatable stainless steels
for greater hardness and strength

Dura

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

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Outokumpu Dura grades

Dura 420/4021

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

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  • 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
Typical chemical composition, % by mass
  • C: 0.20
  • Cr: 13.0
  • Ni: -
  • Mo: -
  • N: -
  • Others: -

Dura 420/4034

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

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  • EN: 1.4034
  • ASTM type: 420
  • ASTM UNS: S42000
  • Microstructure: Martensitic
Typical applications
  • Professional kitchen knives
  • Surgical instruments
  • Press plates
  • Brake discs
Typical chemical composition, % by mass
  • C: 0.45
  • Cr: 13.7
  • Ni: -
  • Mo: -
  • N: -
  • Others: -

Dura 410/4006

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

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  • EN: 1.4006
  • ASTM type: 410
  • ASTM UNS: S41000
  • Microstructure : Martensitic
Typical applications
  • Valves
  • Flanges
  • Axles
  • Pump parts
  • Brake discs
Product forms
Typical chemical composition, % by mass
  • C: 0.12
  • Cr: 12.0
  • Ni: -
  • Mo: -
  • N: -
  • Others: -

Dura 4024

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

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  • 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

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

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  • EN: 1.4120
  • 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

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

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  • 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
Typical chemical composition, % by mass
  • C: 0.30
  • Cr: 12.5
  • Ni: -
  • Mo: -
  • N: -
  • :

Dura 4419Mo

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

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  • EN: 1.4419
  • ASTM type: -
  • ASTM UNS: -
  • Microstructure: Martensitic
Typical applications
  • Mechanical engineering applications
Typical chemical composition, % by mass
  • C: 0.38
  • Cr: 13.3
  • Ni: -
  • Mo: 0.9
  • N: -
  • Others: -

Dura 420/4031

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

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  • EN: 1.4031
  • ASTM type: 420
  • ASTM UNS: S42000
  • Microstructure : Martensitic
Typical applications
  • Cutting utensils
  • Surgical instruments
  • Measuring tools
  • Wear-resistant mechanical parts 
Typical chemical composition, % by mass
  • C: 0.38
  • Cr: 13.5
  • Ni: -
  • Mo: -
  • N: -
  • Others: -

Dura 4122

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. 

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  • EN: 1.4122
  • ASTM type: -
  • ASTM UNS: -
  • Microstructure: Martensitic
Typical applications
  • Surgical instruments
  • Food processing equipment
  • Mechanical parts
  • Machine and pump construction
Typical chemical composition, % by mass
  • C: 0.41
  • Cr: 16.1
  • Ni: -
  • Mo: 1.0
  • N: -
  • Others: -

Dura 4110

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

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  • EN: 1.4410
  • ASTM type: -
  • ASTM UNS: -
  • Microstructure: Martensitic
Typical applications
  • Knife blades
  • Scissors
  • Surgical cutting tools
  • Measuring tools
  • Pump construction
  • Valves
Typical chemical composition, % by mass
  • C: 0.50
  • Cr: 14.8
  • Ni: -
  • Mo: 0.8
  • N: -
  • Others: -

Dura 4116

Similar to Dura 4110 but with elevated wear resistance.

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  • EN: 1.4116
  • ASTM type: -
  • ASTM UNS: -
  • Microstructure: Martensitic
Typical applications
  • Cutting instruments that undergo partial hardening
Typical chemical composition, % by mass
  • C: 0.50
  • Cr: 14.4
  • Ni: -
  • Mo: 0.6
  • N: -
  • Others: -

Dura 17-4PH

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

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  • 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
Typical chemical composition, % by mass
  • C: 0.02
  • Cr: 15.5
  • Ni: 4.8
  • Mo: -
  • N: -
  • Others: Nb, Cu

Dura 17-7PH

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

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  • EN: 1.4568
  • ASTM: 631
  • UNS: S17700
  • Microstructure: Precipitation hardening
Typical applications
  • Retaining rings
  • Springs
  • Valves and flanges
  • Gears
  • Aircraft parts
Typical chemical composition, % by mass
  • C: 0.08
  • Cr: 17.0
  • Ni: 7.0
  • Mo: -
  • N: -
  • Others : Al

Circle Green Dura 420/4034

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

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  • EN: 1.4034
  • ASTM type: 420
  • ASTM UNS: S42000
  • Microstructure: Martensitic
Typical applications
  • Professional kitchen knives
  • Surgical instruments
  • Press plates
  • Brake discs
Typical chemical composition, % by mass
  • C: 0.45
  • Cr: 13.7
  • Ni: -
  • Mo: -
  • N: -
  • Others: -

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For Greater Hardness and Strength

Dura

The Dura range contains 14 martensitic and precipitation hardening stainless steel products designed for applications that demand a high level of surface hardness.

In addition to improved hardenability, these products are characterized by high strength and wear resistance attributes. For this reason, the main alternatives to the Dura range products are carbon steels rather than other ranges of stainless steel.

Dura range products are sold as solution annealed and then age hardened for use in applications that require hardness and a higher corrosion resistance than carbon steel can offer. These products are applicable to everything from high quality knives and scalpels all the way to aircraft landing gear. The precipitation hardening products are hardened by a special mechanism involving the formation of precipitates within the microstructure. Both martensitic and precipitation hardening stainless steels are magnetic.

Our Dura range is especially suitable for end products, which require heat treatment. In the case that you’re needs are geared towards high-strength stainless steels with no heat treatment requirements, our Forta range’s temper rolled products are suitable for those needs.

All Dura range products are readily available around the globe and are delivered from mills that are well known for their on-time delivery accuracy. You can depend on Outokumpu stainless steels to reliably and consistently meet the specifications that your application demands. Our experts can also create products that are custom-made to your precise specifications.

Standards and approvals

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)

Outokumpu Dura range downloads

Outokumpu Dura range datasheet
Outokumpu Product Ranges chart