MS : High Chromium Alloys

Key properties

SM051

SM 051 is a very high strong steel as well as steel tools for extreme temperature conditions. The fundamental characteristic of this steel is a very important hardenability. The air cooling results in a reduced risk of quenching cracks, deformations and residual stresses.
Hardenability provide the alloy mechanical high properties: strength and toughness which associated with high hardness inducing a good wear resistance. It has a high thermal shock resistance and a high resistance to hot conditions.
Welding possibility (with heater precautions) and good machinability of SM 051, provides a wide range of uses.

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 200 and 550 HB
  • Machining: All types of machining are possible.
  • Markets: Cement and ceramics, steel, grinding.

 

 

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SM601

This hypereutectoid chrome molybdenum alloy has a good wear resistance and resilience. It was recommended in all cases where steels at 12% of chromium are not enough resistant and where high manganese steels doesn’t offer a good resistance to abrasion wear.

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 300 and 600 HB
  • Machining: All types of machining are possible.
  • Markets: cement industry, steel, mining and quarrying.

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SM141

Among the family of steels with 12% of chromium, SM 141 often meets conflicting demands: hardness, compressive strength, wear resistance, toughness.
Its impact resistance is higher than the chromium white cast irons. Work normally cold, 450°C is its maximum temperature.

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 350 and 700 HB
  • Machining: All types of machining are possible.
  • Markets: cement industry, steel, mining and quarrying.

 


 

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SM270

SM270 is a martensitic chromium carbides alloy. Its high hardness makes it resistant to abrasion without shock. It’s used in the production of moldings whose thicknesses don’t exceed 150 mm. These parts are used for hard grinding and abrasive materials up to 600 ° C without shocks.
This alloy which replaces Ni -Hard cast iron in all applications and provides a reduced fragility and increased abrasion resistance.

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 400 and 700 HB
  • Machining: All types of machining are possible.
  • Markets: cement industry, steel, mining and quarrying.

 


 

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SM171

This martensitic chromium carbides alloy and high hardenability, meets some requirements:
Good abrasion resistance under severe conditions of use.
Improved mechanical strength, greater than martensitic white cast iron (Ni-Hard).
Retains good characteristics (hardness and stiffness) at high or very high temperatures to 1% molybdenum.
Very good corrosion resistance and hot oxidation

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 400 and 700 HB
  • Machining: machinability is reduced but it’s possible after softening turning treatment, milling and boring sometimes. It is also possible to introduce into the mold the cast iron or steel inserts which are then machined.
  • Markets: cement industry, steel, mining and quarrying.

 

 

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SM251

This high chromium alloy is used in very abrasive wear conditions. The high quantity of chromium carbide of SM251 gives it a maximum wear resistance in some applications with intense abrasion.

  • Manufacturing process: the electric arc furnace, Basic coating. Process controlled by spectrometric analysis and temperature monitoring of each step until the casting.
  • Hardness: between 59 and 64 HRC
  • Machining: machinability is reduced but possible after softening turning treatment, milling and boring sometimes.
  • Markets: rings and grinding rollers - Blow bars , hammers , impellers, shields and all parts requiring high resistance to abrasive wear under low stress and limited impact .