NMB miniature bearing selection of important elements and classification of bearing steel and technical standards

NMB miniature bearing selection of important elements and classification of bearing steel, choice of technology standard NMB miniature bearing need to consider the following elements: 1, the miniature bearing axial load of 2, 3 miniature bearing radial load, 4 miniature imported bearing its own length compensation, the miniature bearing sliding fit the length of the compensation 5, separable miniature bearing ( Accuracy) 6 and 7 miniature bearing precision, the miniature bearing no neutral compensation of 8, 9 miniature bearing rotational speed, miniature bearing cone hole 10, 11, miniature bearing, miniature bearing stiffness friction NMB bearing steel classification of miniature bearing, bearing steel can be divided into: the hardening type bearing steel, surface hardening type bearing steel, high temperature stainless bearing steel, bearing steel, a total of 17 steel grade four class. Some countries increase a category for the special purpose of bearing steel or alloy. Our country has been incorporated into the standard bearing steel classification method similar to ISO, correspond to high carbon chromium bearing steel, carburized bearing steel, corrosion resistant stainless bearing steel, high temperature bearing steel four categories. NMB miniature bearing bearing steel technical standards: the main implement GB/T18254 - bearing steel production 2002 standard and suitable for precision forging bearing user requirements of baosteel GCr15JD quality agreement, including strict quality in GB/T18254 - GCr15JD agreement 2002 standard, GCr15JD require oxygen levels 10 PPM or less, center segregation level 1 or less. Level 0, composition control, scale and dimension deviation in GB/T18254 - yan 2002 standard.