The physical, chemical, mechanical properties and metallographic structure of steel are all determined by the chemical composition. After the ingot is billeted, the shrinkage part is cut off. Micro quality: The internal structure of the bearing steel is required to be uniform and high in purity.
The inspection quantity of the bearing steel is determined according to the ordering technical standard of the steel and the supply status. Oxides: They are brittle in nature, so they are also called brittle inclusions.
Macroscopic quality: It is required that there are no white spots, shrinkage holes, slag inclusions, civil metals, cracks, overburning, subcutaneous bubbles and 626 ball bearing other defects in the bearing steel. The existence of non-metallic inclusions in bearing steel is one of the main reasons for reducing the service life of bearings.01mm micrometer. The steel plate shall be cut and prepared according to the standard requirements, and the tensile test shall be carried out on the tensile machine. 5.
For hot pickling, use 50% industrial hydrochloric acid aqueous solution, heating to 70±5℃, pickling time is 30~40min, after the sample is taken out, rinse with alkaline water, and then rinse with 80℃ hot water. The Brinell hardness test method is carried out according to the GB231-84 standard. High-power structure inspection: The high-power structure is inspected with a metallurgical microscope.
The purity of bearing steel refers to the degree of contamination of steel by non-metallic inclusions. an examination. Carbides are hard and brittle phases, which destroy the continuity between grains and severely reduce the impact toughness of steel. Uneven annealing structure: the annealing structure of bearing steel requires uniformly distributed or spherical pearlite. Cold-drawn annealed steel bars and steel pipes can be filed on the whole material with a thin flat file into three or four circular smooth surfaces, and inspected with the naked eye. Each batch of steel must be composed of the same steel grade, the same smelting furnace number, the same heat treatment furnace, and the same size steel.
https://www.cnzxzc.com/product/62-series/mechanical-bearing-626.html
The inspection quantity of the bearing steel is determined according to the ordering technical standard of the steel and the supply status. Oxides: They are brittle in nature, so they are also called brittle inclusions.
Macroscopic quality: It is required that there are no white spots, shrinkage holes, slag inclusions, civil metals, cracks, overburning, subcutaneous bubbles and 626 ball bearing other defects in the bearing steel. The existence of non-metallic inclusions in bearing steel is one of the main reasons for reducing the service life of bearings.01mm micrometer. The steel plate shall be cut and prepared according to the standard requirements, and the tensile test shall be carried out on the tensile machine. 5.
For hot pickling, use 50% industrial hydrochloric acid aqueous solution, heating to 70±5℃, pickling time is 30~40min, after the sample is taken out, rinse with alkaline water, and then rinse with 80℃ hot water. The Brinell hardness test method is carried out according to the GB231-84 standard. High-power structure inspection: The high-power structure is inspected with a metallurgical microscope.
The purity of bearing steel refers to the degree of contamination of steel by non-metallic inclusions. an examination. Carbides are hard and brittle phases, which destroy the continuity between grains and severely reduce the impact toughness of steel. Uneven annealing structure: the annealing structure of bearing steel requires uniformly distributed or spherical pearlite. Cold-drawn annealed steel bars and steel pipes can be filed on the whole material with a thin flat file into three or four circular smooth surfaces, and inspected with the naked eye. Each batch of steel must be composed of the same steel grade, the same smelting furnace number, the same heat treatment furnace, and the same size steel.
https://www.cnzxzc.com/product/62-series/mechanical-bearing-626.html
コメント