Good Quality L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 Buenos Aires

Good Quality
 L6 Tool Steel | 1.2714 | 55NiCrMoV7 | SKT4 | BH224/5 Buenos Aires

Short Description:

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 shoul...


  • 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
  • Product Detail

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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 of ASTM 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 below applications:

    • spindles,

    • forming rolls,

    • punches,

    • blanking and forming dies,

    • trimmer dies,

    • clutch parts,

    • pawls,

    • bearings,

    • chucks parts,

    • rollers,

    • knuckle pins,

    • clutch pins,

    • shear blades

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    Froth Floatation Process

    Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in several processing industries. Historically this was first used in the mining industry
    The following steps are followed:
    1.Grinding to liberate the mineral particles
    2.Reagent conditioning to achieve hydrophobic surface charges on the desired particles
    3.Collection and upward transport by bubbles in an intimate contact with air or nitrogen
    4.Formation of a stable froth on the surface of the flotation cell
    5.Separation of the mineral laden froth from the bath (flotation cell)
    Simple flotation circuit for mineral concentration. Numbered triangles show direction of stream flow, Various flotation reagents are added to a mixture of ore and water (called pulp) in a conditioning tank. The flow rate and tank size are designed to give the minerals enough time to be activated. The conditioner pulp [1] is fed to a bank of rougher cells which remove most of the desired minerals as a concentrate. The rougher pulp [2] passes to a bank of scavenger cells where additional reagents may be added. The scavenger cell froth [3] is usually returned to the rougher cells for additional treatment, but in some cases may be sent to special cleaner cells. The scavenger pulp is usually barren enough to be discarded as tails. More complex flotation circuits have several sets of cleaner and re-cleaner cells, and intermediate re-grinding of pulp or concentrate.
    froth flotation cell. Numbered triangles show direction of stream flow. A mixture of ore and water called pulp [1] enters the cell from a conditioner, and flows to the bottom of the cell. Air [2] or nitrogen is passed down a vertical impeller where shearing forces break the air stream into small bubbles. The mineral concentrate froth is collected from the top of the cell [3], while the pulp [4] flows to another cell.

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    Tool steel refers to a variety of carbon and alloy steels that are particularly well-suited to be made into tools. Their suitability comes from their distinctive hardness, resistance to abrasion, their ability to hold a cutting edge, and/or their resistance to deformation at elevated temperatures (red-hardness). Tool steel is generally used in a heat-treated state. Many high carbon tool steels are also more resistant to corrosion due to their higher ratios of elements such as vanadium and niobium.
    With a carbon content between 0.7% and 1.5%, tool steels are manufactured under carefully controlled conditions to produce the required quality. The manganese content is often kept low to minimize the possibility of cracking during water quenching. However, proper heat treating of these steels is important for adequate performance, and there are many suppliers who provide tooling blanks intended for oil quenching.

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