China Cheap price L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 Manufacturer in Sheffield

China Cheap price L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 Manufacturer in Sheffield

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In ASTM A681 standard, L6 steel grade is in L-type for special purpose tool steels. AISI L6 tool steel is in the general class of alloy, oil-hardening tool steel that ischaracterized by good toughness. ASTM L6 tool steel is suitable for useas tools, dies, and machine parts, which require a good combination ofhardness and toughness. Due to its lower carbon content andrelatively high nickel content, L6 tool steel has slightly bettershock-resistance than more highly alloyed types and should be u...


  • Length: 3-5.8mm or Customization
  • Surface: black, peeled, or rough turned
  • Heat treatment: air-cooling, normalized, annealed, Q&T
  • Smelting process: EAF+LF+VD
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    In ASTM A681 standard, L6 steel grade is in L-type for special purpose tool steels. AISI L6 tool steel
    is in the general class of alloy, oil-hardening tool steel that is
    characterized by good toughness. ASTM L6 tool steel is suitable for use
    as tools, dies, and machine parts, which require a good combination of
    hardness and toughness.

    Due to its lower carbon content and
    relatively high nickel content, L6 tool steel has slightly better
    shock-resistance than more highly alloyed types and should be used where
    some wear-resistance can be sacrificed for increased toughness.

    1. Relevant Steel Specification of L6 Tool Steel

    Country USA German Japan British
    Standard ASTM A681 DIN EN ISO 4957 JIS G4404 BS 4659
    Grades L6/T61206 1.2714/55NiCrMoV7 SKT4 BH224/5

    2. AISI L6 Steel Chemical Composition and Steel Equivalents

    ASTM A681 C Mn P S Si Cr V Mo Ni
    L6/T61206 0.65 0.75 0.25 0.80 0.03 0.03 0.10 0.50 0.60 1.20 . . . . . . . . . 0.50 1.25 2.00
    DIN ISO 4957 C Mn P S Si Cr V Mo Ni
    1.2714/55NiCrMoV7 0.50 0.60 0.60 0.90 0.03 0.02 0.10 0.40 0.80 1.20 0.05 0.15 0.35 0.55 1.50 1.80
    JIS G4404 C Mn P S Si Cr V Mo Ni
    SKT4 0.50 0.60 0.60 0.90 0.03 0.02 0.10 0.40 0.80 1.20 0.05 0.15 0.35 0.55 1.50 1.80
    BS 4659 C Mn P S Si Cr V Mo Ni
    BH224/5 0.49 0.57 0.70 1.00 0.03 0.025 . . . 0.35 0.70 1.10 . . . . . . 0.25 0.40 1.25 1.80

    3. ASTM L6 Tool Steel Mechanical Properties

    Steel L6 Physical Properties

      Modulus of elasticity [103 x N/mm2]: 215

      Density [g/cm3]: 7.84

      Thermal conductivity [W/m.K]: 36.0

      Electric resistivity [Ohm mm2/m]: 0.30

      Specific heat capacity[J/g.K]: 0.46

      Mechanical Properties of L6 Steels

      Properties Metric Imperial
      Poisson’s ratio 0.27- 0.30 0.27- 0.30
      Elastic modulus 190-210 GPa 27557-30457 ksi

      4. Forging of L6 Tool Steel

      Forge at 1079°C (1975 F) down to 871°C (1600 F). Do not forge below 843°C (1550 F).

      5. AISI L6 Tool Steel Heat Treatment

      Hardening

      Preheating:
      Heat steel L6 at a rate not exceeding 204°C (400°F) per hour (222°C per
      hour) to 621-677°C (1150-1250°F) and equalize. Soak for 30 minutes for
      the first inch (25.4 mm) of thickness, plus 15 minutes for each
      additional inch (25.4 mm).

      Quenching

      Quench L6 tool steel in oil to 66-51°C (150-125°F).

      Tempering

      Temper
      L6 steels immediately after quenching. Hold at temperature for 1 hour
      per inch (25.4 mm) of thickness when tempering at 204°C (400°F), 4 hours
      minimum, then air cool to ambient temperature.
      However, where increased toughness is desired, at a sacrifice of some hardness, higher tempering temperatures are often used.

      AISI L6 steel does not become brittle, as many other die steels do, when tempered in the range of 232°C to 426°C (450 to 800°F).

      To
      minimize the possibility of cracking, the steel should be tempered
      immediately after hardening and should be heated slowly to the desired
      tempering temperature.

      Annealing

      Annealing of steel L6 must be performed after hot working and before re-hardening.

      Heat
      to 760°C (1400°F) and hold one hour per inch of maximum thickness. Then
      cool slowly with the furnace at a rate not exceeding 28°C per hour(50°F
      per hour) to 538°C (1000°F). Continue cooling to ambient temperature in
      the furnace or in air.

      For improved machinability, hold at 760°C
      (1400°F) for 1 hour per inch (25.4mm) of maximum thickness; 2 hours
      minimum. Then cool slowly with the furnace cool from 677°C (1250°F) to
      760°C (1400°F), hold for 8 hours, then air cool to ambient temperature.

      Because of its air-hardening ability, steel L6 should not be normalized.

      6. Machinability of Steel L6

      Machinability
      of tool steel L6 is very good. It rates 90% of the machinability of the
      W-group water hardening low alloy steels rated 100% as a baseline.

      7. Applications ofASTM A681 L6 Tool Steel

      AISI
      L6 cold working tool steel is for general purpose tools and dies where
      greater toughness is required, but with some sacrifice of
      abrasion-resistance.

      Typically used belowapplications:




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