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Quality index of cast steel ball

Quality index of cast steel ball

  • Categories:Industry News
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  • Time of issue:2020-02-12
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(Summary description)High chromium ball quality indicators: The chromium content ≥10.0% and the carbon content between 1.80% and 3.20% are called high chromium balls. National standards require that the high chromium ball hardness (HRC) must be ≥58 and the impact value ak≥3.0J / ㎝2, if this hardness is reached,

Quality index of cast steel ball

(Summary description)High chromium ball quality indicators: The chromium content ≥10.0% and the carbon content between 1.80% and 3.20% are called high chromium balls. National standards require that the high chromium ball hardness (HRC) must be ≥58 and the impact value ak≥3.0J / ㎝2, if this hardness is reached,

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-02-12
  • Views:0
Information
  I. High chromium ball quality indicators: The chromium content ≥10.0% and the carbon content between 1.80% and 3.20% are called high chromium balls. National standards require that the high chromium ball hardness (HRC) must be ≥58 and the impact value ak≥3.0J / ㎝2, if this hardness is reached, high-chromium balls must be subjected to high-temperature quenching and tempering (the current domestic high-chromium ball quenching has two types of oil quenching and air quenching), such as testing hardness (HRC) lower than 54 The following shows that high chromium balls are not quenched.
  Second, the quality index of medium chromium balls: chromium content 3.0% ~ 7.0%, carbon content between 1.80%-3.20% are called medium chromium balls, the impact value ak ≥ 2.0J / ㎝2, national standards require medium chromium The ball hardness (HRC) must be ≥ 47. In order to ensure the quality of the steel balls, the chromium balls need to be subjected to high temperature tempering (to achieve the purpose of eliminating casting stress). If the surface of the steel ball is dark red, it indicates that the product has been subjected to high temperature tempering. If the surface of the steel ball is still metallic, it indicates that the product has not been subjected to high temperature tempering.
  Third, the low chromium ball quality indicators: 0.5% to 2.5% chromium content, carbon content between 1.80%-3.20% are called low chromium balls, national standards require low chromium ball hardness (HRC) must be ≥ 45, Impact value ak≥1.5J / ㎝2, in order to ensure the quality of steel balls, low-temperature chromium balls also need to be subjected to high-temperature tempering (to achieve the purpose of eliminating casting stress). If the surface of the steel ball is dark red, it indicates that the product has been subjected to high-temperature tempering. 2. If the surface of the steel ball is still metallic, it means that the product is not tempered at high temperature.

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