Machine component and rolling bearing

Machine component and rolling bearing

  • CN 101,874,125 B
  • Filed: 11/21/2008
  • Issued: 06/10/2015
  • Est. Priority Date: 11/27/2007
  • Status: Active Grant
First Claim
Patent Images

1. a component of machine (11, 12, 13, 21, 23, 31, 32, 33, 41, 42, 43, 51, 52, 53), it is characterized in that, by the carbon containing below more than 0.77 quality % 0.85 quality %, the silicon of below more than 0.01 quality % 0.25 quality %, the manganese of below more than 0.01 quality % 0.35 quality %, the nickel of below more than 0.01 quality % 0.15 quality %, the chromium of below more than 3.75 quality % 4.25 quality %, the molybdenum of below more than 4 quality % 4.5 quality %, the vanadium of below more than 0.9 quality % 1.1 quality %, more than be divided into the steel of iron and impurity to be formed,The nitrogen enriched layer (11B, 12B, 13B, 21B, 23B, 31B, 32B, 33B, 41B, 42B, 43B, 51B, 52B, 53B) of more than nitrogen concentration 0.05 quality % is defined in the region comprising surface (11A, 12A, 13A, 21A, 23A, 31A, 32A, 33A, 41A, 42A, 43A, 51A, 52A, 53A)Carbon concentration in described nitrogen enriched layer (11B, 12B, 13B, 21B, 23B, 31B, 32B, 33B, 41B, 42B, 43B, 51B, 52B, 53B) and the aggregate value of nitrogen concentration are below more than 0.82 quality % 1.9 quality %;

  • With described in microscopic examination time nitrogen enriched layer (11B, 12B, 13B, 21B, 23B, 31B, 32B, 33B, 41B, 42B, 43B, 51B, 52B, 53B), there is long-width ratio more than 2 and the quantity of the grain boundary precipitate of the nitride (90) of the iron formed along crystal boundary of long more than 7.5 μ

    m is less than 1 in 5 visuals field of the square area of 150 μ

    m.

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