1.4418/S165M

• Round EN 10060 / EN 10278
• Flat EN 10058 / EN 10278
• Square EN 10059 / EN 10278
• Hexagonal EN 10278
• Angle EN 10056
• Bar steel, bright steel, wire, wire rod, billets, ingots, semi-finished products

This LC- Martensitic or Soft-Martensitic stainless steel exhibits high tensile properties combined with excellent ductility and better corrosion resistance than the common type 400 series martensitics. In the hardened and tempered condition, this grade shows a structure made up of tempered martensite + stable austenite and small amount of ferrite. The quantity and distribution of these phases strictly depends on chemical balance. In the as quenched condition, high values of Rm and HB are obtained, that reach their maximum after tempering at about 450°C. Increasing the temperature beyond 500°C, the formation of finely dispersed stable austenite begins, reaching its maximum at about 610° C. This stable austenite causes a favorable situation in terms of toughness even at low temperature and it doesn’t transform into martensite after cooling. On the contrary, temperatures above A1 ( e.g. 620°C ) some of the austenite becomes unstable, and changes into martensite, after cooling from temperature below Ms. This behavior requires further tempering to avoid a stress situation that could cause quenching cracks and stress corrosion.

Some typical application areas are water turbine parts, propeller shafting, shafting, piston rods and equipment for hydro power stations, compressors, pumps, turbines, valves in the oil and gas industries, mining and refrigerators industries, separation technologies, homogenizers and centrifuges.