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EN 1.4418 is a martensitic-austenitic stainless steel with a high strength and low carbon content. It combines high strength with good weldability—properties that are retained after welding. It is also corrosion-resistant. EN 1.4418 is intended for use in mildly corrosive environments where the properties listed above are required for the application in question.

In our standard condition, the steel matrix consists of approximately 80% martensite, 10% austenite, and 10% ferrite, with the remaining 20% being other alloys. After quenching and tempering, this composition allows for the formation of a low-carbon martensitic structure. Martensite, some austenite that has survived, chrome, and molybdenum all contribute to the following characteristics of the rock:

  • High tensile strength.
  • High toughness – also in welds.
  • Better corrosion properties than for most of the existing stainless martensitic steels.
  • Very good fatigue resistance.

Chemical Composition :

Typical analysis
Norm EN 10088-3-1.4418 QT 900
Delivery condition Quenched and tempered

Physical properties :

Temperature 20º C 100ºC 200º C 300ºC 400ºC
Density kg/dm3 7,7
Modulus of elasticity GPa 200 195 185 175 170
Mean coeff. of thermal expansion 20 ºC - Temp. x10-6. K-1 - 10,3 10,8 11,2 11,6
Thermal conductivity W/m . K 15
Specific thermal capacity J/kg . K 430
Electrical resistivity mm2/m 0,8

Mechanical properties :

Values at room temperature - QT 900,

Impact strength at -40 ºC.

Tensile strength Rm N/mm2 900 - 1100
Proof strength Rp02 N/mm2 min 750
Reduction of area Z % Min 40
Elongation A5 % Min 16
Hardness HB 280 - 340
Impact energy KV at -40ºC Longitudinal- and transversal direction J/cm2 Min 32


  • Shafting, Propeller shafting
  • Propeller bolting
  • Mixer and stirrer production
  • Processing vessels and equipment for thermo           mechanical pulp industry.
  • Water turbine parts.
  • Equipment for hydro power stations
  • Shear pins
  • Piston rods

Work Process

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