​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Outokumpu Prodec range

​Improved machinability​

  • ​​Stainless steel grades optimized for improved machinability resulting in longer tool life and enhanced quality
  • Faster machining
  • Longer tool life
  • Superior quality – tolerance and surface​​​​​​​​​​​​​​​

Prodec 304L/4307
Prodec 316L/4404
Prodec 303/4305
Prodec 17-4PH
Typical applications
Fasteners Nuts, bolts and screws
Flanges Gears
Valves Shafts
Pressure fittings Bearings

​Compare ​product performance​​

​Produc​t properties​​

 Corrosion resistance

Although improvements in machinability in the past have been associated with reduced corrosion resistance, the Prodec range has been shown to have corrosion resistance within the range typically expected from comparable stainless steel products.

For more information

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


Outokumpu Prodec range products enable higher machining speeds, longer tool life, and superior part quality with reduced total cost for finished parts.

Cold forming

Outokumpu Prodec range products can be hot forged or readily formed and fabricated with the full range of cold forming operations. They can be used in heading, drawing, bending, and upsetting. Cold forming operations will increase the strength and hardness of the material, and may leave it slightly magnetic. For Prodec 17-4PH, cold forming or fabrication should be done prior to the final solution annealing and age hardening treatments.


Prodec 304L/4307 and 316L/4307 are readily weldable with the full range of conventional welding methods with the exception of oxyacetylene. Prodec 303/4305 stainless steel is not recommended for applications requiring welding. Prodec 17-4PH can be satisfactorily welded with either 630 or AWS E308L/ER308L welding consumables. ​​

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

 Forms & dimensions

The available forms for Outokumpu Prodec 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

  • ​​EN 10088-2
  • EN 10088-3
  • EN 10088-4
  • EN 10088-5
  • ASME SA479
  • ASTM A479/479M
  • ASTM A276
  • ASTM A555
  • ASTM A493

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)



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