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    7Jul, 2025
    What scenarios are HRC 55-65 cast steel balls suitable for?

    How to test Rockwell hardness cast steel balls with HRC 55-65?、

    Rockwell hardness HRC 55-65 cast steel ball application scenarios and testing guide

    一. Core application scenarios of HRC 55-65 cast steel balls: high wear and medium impact conditions

    Application Areas Typical Working Conditions Recommended Hardness Range Representative Scenario Cases
    Mineral processing Ore crushing and grinding (such as iron ore and copper ore) requires resistance to ore cutting wear and tear, and at the same time withstands impact and collision between steel balls. HRC 58-62 When the ball mill processes quartzite (Mohs hardness level 7), the wear rate of φ80mm high chromium ball (HRC60) is less than 8g/hour.
    Building materials cement mill Cement clinker grinding (specific surface area 300-400m²/kg), requires wear resistance while avoiding excessive crushing that leads to a decrease in grinding efficiency. HRC 60-63 The cement fine grinding bin uses φ40mm high chromium balls (HRC62), with a wear loss of as low as 0.3kg per ton of cement and a service life of more than 10,000 hours.
    Metallurgical sintering pellets Iron ore sintering crushing, the material temperature is high (≤200℃) and contains iron oxide abrasive particles, which need to resist thermal wear and oxidation corrosion. HRC 55-58 Medium chromium balls (HRC58) for sintering crushing have a lifespan three times longer than ordinary carbon steel balls (from 3 months to 9 months).
    Crushing of construction machinery The hammer and jaw plates of the crusher are lined with steel balls to withstand the impact of stones (such as crushing construction waste), which requires both hardness and toughness. HRC 58-62 The wear-resistant balls (HRC60) used in cone crushers can withstand a crushing cycle of 600 hours when processing granite (common steel balls only 200 hours).
    Wear-resistant parts manufacturing As a wear-resistant coating spray substrate (such as shield machine cutter), or for grinding media (such as ceramic polishing). HRC 62-65 Small diameter steel balls (φ5-10mm, HRC65) for ceramic polishing, the grinding efficiency is 40% higher than that of HRC55 steel balls.

    二. In-depth analysis of scene adaptability: matching logic between hardness and working conditions

    01.HRC 55-58: Medium wear + high impact scenario
    Features: Moderate hardness, good impact toughness (≥12J/cm²), suitable for working conditions with material hardness ≤ Mohs 5 and frequent impact.
    Case: Coal mine ball mill processes coal gangue (Mohs hardness 4), using HRC58 low alloy cast steel balls, with a crushing rate of <1% and a lifespan of 5000 hours.

    02.HRC 59-62: High wear + medium impact scenario
    Features: The content of chromium carbide hard phase (M7C3) increases, and the wear resistance is significantly improved, but the toughness is slightly reduced (impact toughness 8-12J/cm²).
    Case: φ100mm high chromium ball (HRC60) for gold ore dressing, processing quartz vein gold ore (Mohs hardness 7), single ball wear loss 0.15g/ton ore, lifespan over 8000 hours.

    03.HRC 63-65: Extremely high wear + low impact scenario
    Features: Close to ceramic hardness, top wear resistance, but brittle (impact toughness <8J/cm²), only suitable for grinding environments without obvious impact.
    Case: φ3mm micro steel ball (HRC65) for grinding electronic ceramic raw materials (alumina powder), wear rate <0.01%/100 hours, avoid the introduction of impurities.

    三. The whole process of cast steel ball hardness testing: from standards to practical details

    1. Testing standards and equipment
    Implementation standards:
    GB/T 230.1-2018 “Metallic Materials Rockwell Hardness Test Part 1: Test Method”;
    ASTM E18-21 “Standard Test Methods for Rockwell Hardness of Metallic Materials”.

    2. Core equipment:
    Rockwell hardness tester (resolution 0.5HRC, load accuracy ±1%), digital display (such as HR-150A) or fully automatic model (such as THR-150) is recommended;
    Diamond indenter (cone angle 120°, top curvature radius 0.2mm), which needs to be calibrated regularly with a standard hardness block (such as HRC60±1).

    24May, 2021
    Wear Parts of Mill

    Wear Parts of Mill

    Specializing in the production of ball mill liner plate. We major supply crusher wear parts from 5kgs to 10000kgs. The Wear Parts of Mill a huge role in the wear industry now, it is very helpful for us to improve work efficiency and skill level.
    Hardness: more than HRC60
    Microstructure: Fine Martensite + Carbide + retained Austenite(≤6%)
    Mine Mill Liners It includes two parts, high wear resistance boltless plates and highly expandable riveting plates, which are self-fastened and strengthened to withstand impact from mill balls.
    The Mine Mill Liners Plates are cleaned, sandblasted with a nice surface without any obvious visual defects that can avoid the normal working of the castings.

    The general advantages in Wear Parts of Mill are as follows:

    In the last 20 years, our liners have been widely used in large, medium and small ball mills and ultrafine crushing equipment in China’s power generation, mining, cement, chemical engineering and metallurgical industries.

    Wear Parts of Mill Wear Parts of Mill
    Chrome Molybdenum Steel Wear Parts of Mill Chemistry Standard:
    Standard Specification for Cr-Mo Alloy Steel:
    Reference Standard      Nominal Chemical Composition (W%)
    C Si Mn P S Ni Cr Mo
    AS 2074/L2A 0.45-0.55 ≤0.75 0.50-1.00 ≤0.04 ≤0.04 – 0.80-1.20 –
    AS 2074/L2B 0.55-0.65 ≤0.75 0.50-1.00 ≤0.04 ≤0.04 – 0.80-1.50 0.2-0.4
    AS 2074/L2C 0.70-0.90 ≤0.75 0.50-1.20 ≤0.04 ≤0.04 – 1.30-2.40 0.2-0.4
    ZG42Cr2Si2MnMo 0.38-0.48 1.5-1.8 0.8-1.2 ≤0.04 ≤0.04 – 1.8-2.2 0.2-0.6
    ZG45Cr2Mo 0.40-0.48 0.8-1.2 0.4-1.0 ≤0.04 ≤0.04 ≤0.5 1.7-2.0 0.8-1.2
    ZG30Cr5Mo 0.25-0.35 0.4-1.0 0.5-1.2 ≤0.04 ≤0.04 ≤0.5 4.0-6.0 0.2-0.8
    ZG40Cr5Mo(FED-4A) 0.35-0.45 0.4-1.0 0.5-1.2 ≤0.04 ≤0.04 ≤0.5 4.0-6.0 0.2-0.8
    ZG50Cr5Mo 0.45-0.55 0.4-1.0 0.5-1.2 ≤0.04 ≤0.04 ≤0.5 4.0-6.0 0.2-0.8
    ZG60Cr5Mo 0.55-0.65 0.4-1.0 0.5-1.2 ≤0.04 ≤0.04 ≤0.5 4.0-6.0 0.2-0.8
    FMU-29 0.25-0.45 0.3-1.0 0.6-1.5 ≤0.04 ≤0.04 – 6.0-8.0 0.2-0.4
    FMU-11 0.90-1.30 0.3-1.0 0.6-1.5 ≤0.04 ≤0.04 – 11.0-13.0 0.3-0.5
    FMU-13 0.80-1.30 0.4-1.2 0.8-1.5 ≤0.04 ≤0.04 – 11.0-13.0 0.4-0.8
    FMU-14 1.60-2.00 0.4-1.2 0.8-1.5 ≤0.04 ≤0.04 – 11.0-13.0 0.6-1.0
    Wear Parts of Mill Wear Parts of Mill
    Double-Media Quenching Chromium-Molybdenum Alloy Steel Series
    • We specially design the material for Wear Parts of Mill in mines, coal-fired power plants and cement plants,etc.
    • With our special double media quenching process, the material can not only achieve ideal hardness (HRC48~55) but also ideal toughness value (AK30~100J).
    • It can completely meet the requirement of liners of large and middle size ball mills at home and abroad.
    • The match of Middle Chrome Liners and High Chrome Cast Balls has been the typical model in coal mills and cement mills.
    • Meanwhile, the material is applicable to the teeth plates, armored plates and hammers of crushers and excavator, bucket teeth.
    Pearlitic Chromium-Molybdenum Alloy Steel Series
    • The Pearlitic Chromium Molybdenum Alloy Steel Wear Parts of Mill are widely used in AG Mill,SAG Mill and Ball Mills.
    • Hardness: HB310-375 (equivalent to HRC33-42)
    • Impact resistant Value: Ak≥60J (60×10×10mm) in normal ambient temperature.
    • We can produce pearlitic Cr-Mo steel as per AS2074 Gr. L / 2B.
    Wear Parts of Mill Wear Parts of Mill Wear Parts of Mill
    High Chrome White Iron Series
    • High Chrome white iron we can produce include 15%Cr, 18%Cr, 20%Cr and 26%Cr.
    • Under same working condition,the wear performance of High Chrome mill liners is four times of that of high manganese steel liners and twice of that of low Chrome alloy steel liners.
    • Meanwhile, we can produce high Chrome castings as per AS2027, ASTM A532 and BS4844.
    Customer-made Mill Lining
    • In addition to our patented Boltless Mill Liners, we can produce liners as per the request of customers.
    • So far, we have been the regular suppliers of mill liners Now, we have supplied steel caps inserted in rubber lifters for SAG mills and AG mills to some mines in Australia and New Zealand.
    Wear Parts of Mill Wear Parts of Mill
    Wear Parts for Crusher
    • Depending on the specific working conditions,all wear parts can be ordered as Manganese Steel, high Cr cast iron or Cr-Mo Alloy Steel.
    • Our foundry has complete melting, heat treatment and test equipments,such as mid-frequency induction electrical furnaces,quenching and tempering furnaces, blast shot,spectrometer,Rockwell and Brinell Hardness tester,impactor,UT tester and metallographic microscope.
    • We achieved the certificate of quality management system ISO.
    • We have been exporting castings to oversea

     

    Eternal Bliss Alloy Casting & Forging Co, Ltd.

    Caesar

    E-mail: sales@ebcastworld.com

    Our What’s app: 0086-130 930 23772

    www.ebcastworld.com

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