The global production of stainless steel is increasing. Its success is phenomenal. Its consumption is progressing in construction and household equipment. Other industries of stainless steel are also experiencing a rise. Its excellence in applications leads to a longer life with a low maintenance issue.

Stainless steel is available in a wide range. Its several grades are recognized for specific applications. It is attractive, strong, low maintenance, and economically viable.

The most common stainless steel grades are Ferritic, Austenitic, Martensitic, and Duplex stainless steel. Martensitic stainless is high carbon and low chromium stainless steel.

Martensitic stainless steel is exemplified by high strength and hardness at high temperatures. It is magnetic in annealed and hardened conditions. Martensitic stainless steel shows good ductility and machinability. It is generally used in springs, screwdrivers, pliers, and staple guns.

Martensitic steel offers moderate corrosion resistance and average weldability.

F6NM is martensitic stainless steel.


F6NM is martensitic stainless steel. It is a chromium stainless steel with added nickel and molybdenum to its composition.  It offers its excellence in corrosion resistance and zero notch ductility. Grade F6NM is air-hardened stainless steel. Usually, it is available in quenched and tempered condition. Its machinability is limited to 23HRC. Its approved hardness limit is restricted to 75KSI.

It is used often in applications that require weldability with corrosion resistance. Grade F6NM is primarily used in the oil industry and components of power plants and reactors, turbine construction, etc


Grade F6NM is chromium stainless steel. It contains 11.5-14% chromium with the addition of nickel and molybdenum with other elements like manganese, phosphorous, silicon, and sulfur. The nickel content in the range of 3.5-5.5% and molybdenum is 0.5-1%. The presence of nickel and molybdenum provides excellent zero notch ductility.


 The mechanical properties exhibit by grade F6NM is due to the high content of nickel and molybdenum in its chemical composition. The nickel content significantly improves the mechanical properties.

Grade F6NM attains a tensile strength of 790 Mpa and yield strength of 620 Mpa. Hardness is 295B. Elongation is 15%.


Grade F6NM offers considerable corrosion resistance to no chloride environments

Corrosion resistance can be improved by polishing the surface.


Grade F6NM is ferromagnetic in nature.


Welding can be by pre-heating to about 150°C.



Annealing can be done at between temperature ranges of 600-650°C, followed by air-cooling.


Hardening can be attained by heating in the temperature range of 1100 to 1150 °C followed by quenching and tempering. Mechanical properties improvised by quenching and tempering.


Grade F6NM is primarily used in the oil and petrochemical industry and components of power plants and reactors. It is also used for the manufacture of turbines for hydroelectric power plants.

It is most widely used in manufacturing for the following parts:

  • Valve bodies
  • Flanges
  • Seat
  • Gates
  • Tubular
  • Casting tools

Ambica steels is the core producer of stainless steel products. Our superior quality products are shipped worldwide. We provide high-quality. F6NM stainless steel bars in assorted shapes. Bars are available in round, square, flat, hexagonal, and customized shapes. Inquiry and orders are



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