• TOOL STEEL - L6 / 1.2714 / 5ХНМ / 5CrNiMo / 55NiCrMoV7 / SKT4
  • TOOL STEEL - L6 / 1.2714 / 5ХНМ / 5CrNiMo / 55NiCrMoV7 / SKT4
  • L6 / 1.2714 / 5ХНМ / 5CrNiMo / 55NiCrMoV7 / SKT4
  • L6 / 1.2714 / 5ХНМ / 5CrNiMo / 55NiCrMoV7 / SKT4

L6 / 1.2714 / 5ХНМ / 5CrNiMo / 55NiCrMoV7 / SKT4

L6 Steel Mechanical Properties:

L6 is an oil hardening, cold work tool steel. L6 is characterized by high toughness and relatively high hardness. L6 is used in applications requiring a high level of impact toughness.

AISI L6 Chemical  Composition:

C Mn Si Cr Ni P S Mo
0.65-0.75 0.25-0.80 0.1-0.5 0.6-1.2 1.25-2.0 ≤ 0.030 ≤ 0.030 ≤ 0.5
  • Introduction

  • Heat Treatment

  • Applications

  • Equivalent Grade

  • L6 Steel Introduction:

    L6 is a tough, oil-hardening tool steel possessing a fine-grained structure and desirable shock resistance. L6 is also associated with high strength and good non-deforming characteristics.

  • Annealing:

    Heat slowly to 1400° F, and hold for 1 hour per inch of thickness.  Furnace cool at 20° F per hour to 900° F; air cool to room temperature.  Expected Brinell hardness 217 max.


    Preheat to 1200° F - 1400° F depending on the section size soak until uniformly heated, and either transfer or raise furnace temperature to 1500° F - 1550° F, and hold 1 hour per inch of greatest thickness.  Quench into 150° F oil.


    Temper immediately after quenching, before part has cooled to below 150° F.  Parts should be held a minimum of 2 hours per inch of greatest thickness.  A single temper is sufficient, but double tempering is a good insurance policy.  For most applications the tempering temperature of 400° F is recommended, but since L-6 does not become brittle like other steels, when tempered in 450° F - 800° F range, it may be tempered at a higher temperature where greater toughness is required.  The above tempering table may be used as a guide.  However, since 1/2" dia. specimens were used for this test, it may be found that heavier sections are several points lower.

  • L6 Tool Steel Applications : 

    Form rolls, stamping dies, forming dies, shear blades, punches, trimmer dies, pawls, knuckle pins, spindles, clutch pins.

  • L6 Equivalent Grade:

    5CrNiMO SKT4 55NiCrMoV7 1.2714 5ХНМ


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