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Alkrothal 720 No.1 JR FeCrAl Alloy for brake resistor

Short Description:


  • model name: Alkrothal 720
  • material: fecral
  • shape: round or strip
  • resistivity: 1.25
  • density: 7.4
  • Product Detail

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    Alkrothal 720 No.1 JR for brake resistor

    Typical applications for Alkrothal 720 are in rheostats, braking resistors, etc. It is also used as electrical heating elements in industrial applications.

    Alkrothal 720 is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1000°C (1830°F).

    Nominal Analysis

    Cr Al Fe
    12.0~15.0 4.0~6.0 Balance

    Mechanical Properties

    Max Continuous Service Temperature:
    Resisivity 20ºC:
    Density:
    Thermal Conductivity:
    Coefficient of Thermal Expansion:
    Melting Point:
    Elongation:
    Micrographic Structure:
    Magnetic Property:
    950ºC
    1.25ohm mm2/m
    7.40g/cm3
    52.7 KJ/m·h·ºC
    15.4×10-6/ºC (20ºC~1000ºC)
    1450ºC
    Min 16%
    Ferrite
    magnetic

    Size: Thickness 0.01-7mm, width 0.5-1000mm

    Surface: BA, 2B

    Hardness: Soft, Half hard, hard

    Has been used extensively as big power brake resisor and furnace heating elements.

    Has less hot strength than Tophet alloys but much higher melting point.

    Shanghai TANKII ALLOY MATERIAL Co., Ltd.

    FECRAL AND ALCHROME ALLOY PRODUCER IN China, MOST PROFESSIONAL IN THE WORLD

    We also produce below grades:

    0Cr15Al5 and 0Cr19Al3, etc.

    Chemical Composition and Main Property of Fe-Cr-Al Resistance Alloy
    Properties Grade 1Cr13Al4 0Cr25Al5 0Cr21Al6 0Cr23Al5 0Cr21Al4 0Cr21Al6Nb 0Cr27Al7Mo2
    Main Chemical Composition
    (%)
    Cr 12.0-15.0 23.0-26.0 19.0-22.0 22.5-24.5 18.0-21.0 21.0-23.0 26.5-27.8
    Al 4.0-6.0 4.5-6.5 5.0-7.0 4.2-5.0 3.0-4.2 5.0-7.0 6.0-7.0
    Re opportune opportune opportune opportune opportune opportune opportune
    Fe Bal. Bal. Bal. Bal. Bal. Bal. Bal.
    Nb0.5 Mo1.8-2.2
    Max Continuous Service Temperature(oC) 950 1250 1250 1250 1100 1350 1400
    Resisivity 20oC (Ωmm2/m) 1.25
    ±0.08
    1.42
    ±0.06
    1.42
    ±0.07
    1.35
    ±0.07
    1.23
    ±0.07
    1.45
    ±0.07
    1.53
    ±0.07
    Density(g/cm3) 7.4 7.1 7.16 7.25 7.35 7.1 7.1
    Thermal Conductivity 52.7 46.1 63.2 60.2 46.9 46.1 45.2
    (KJ/m@h@oC)
    Coefficient of Thermal Expansion(α×10-6/oC) 15.4 16 14.7 15 13.5 16 16
    Approximate Melting Point( oC) 1450 1500 1500 1500 1500 1510 1520
    Tensile Strength(N/mm2) 580-680 630-780 630-780 630-780 600-700 650-800 680-830
    Elongation(%) >16 >12 >12 >12 >12 >12 >10
    Section Variation 65-75 60-75 65-75 65-75 65-75 65-75 65-75
    Shrink Rate (%)
    Repeatedly Bend Frequency(F/R) >5 >5 >5 >5 >5 >5 >5
    Hardness (H.B.) 200-260 200-260 200-260 200-260 200-260 200-260 200-260
    Continuous Service Time no ≥80/1300 ≥80/1300 ≥80/1300 ≥80/1250 ≥50/1350 ≥50/1350
    Micrographic Structure Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite
    Magnetic Property Magnetic Magnetic Magnetic Magnetic Magnetic Magnetic Magnetic

     


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