Stainless Steel, Martensitic1.4005 (416) Bar

Martensitic stainless steel machining bar.

Grade 416 is a martensitic machining bar with machinability enhanced through the addition of phosphorus and sulphur.

It has the highest machinability of any stainless steel, at about 85% of that of a free-machining carbon steel. As for most other free-machining stainless steels the improvement in machinability is achieved by addition of sulphur which forms manganese sulphide inclusions; this sulphur addition also lowers the corrosion resistance, weldability and formability to below that of its non-free machining equivalent grade 410.

Grade 416 is sometimes used in the unhardened or hardened and highly tempered condition because of its low cost and ready machinability.

Martensitic stainless steels are optimised for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually also allow for a final harden and temper heat treatment. Corrosion resistance is lower than the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.

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Product FormConditionImperial SizesMetric Sizes
Round BarQT65018" - 6"4mm - 30mm
Round BarCondition P18" - 6"4mm - 30mm
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Related Specifications


Chemical Composition


  • Valve parts
  • Pump shafts
  • Automatic screw machine parts
  • Motor shafts
  • Washing machine components
  • Bolts and nuts
  • Studs
  • Gears


  • Excellent machinability
  • Low cost
  • Improved non-galling characteristics
  • Poor weldability
  • Poor formability
  • Limited corrosion resistance

Additional Information


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