| Home>Bearing knowledge>Quality requirements and disadvantages of bearing steel (3) |
Bearing steel quality requirements and shortcomings (3)
Source: Bearing network time: 2018-07-09
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
(3) Non-metallic inclusions: steel in the process of exercise and casting; chemical reaction products and deoxidation products caused by the contact between the molten steel and the molten steel and the lining; and the furnace wall and the steel tapping tank , steel ladle; soup and other anti-inflammatory materials are eroded and fall into the molten steel. These non-steel liquid materials that enter the molten steel and are not discharged are called non-metallic impurities. The presence of non-metallic inclusions in the bearing steel; One of the main reasons for the service life of steel. Non-metallic inclusions in steel are classified into the following types according to their characteristics, shape and dispersion.
Oxide: It is more brittle; it is also called brittle noisy; it is usually distributed in a chain in the rolling direction; such as aluminum oxide (Al2O3) and iron oxide (FeO).
Sulfide: has good plasticity; can be deformed; it is also called plastic noisy. It is distributed in the steel in the rolling direction. For example, iron sulfide (FeS) and manganese sulfide (MnS) belong to this category. Outside the material; silicate also has a certain plasticity; also known as plastic inclusions.
Point-like non-deformed inclusions: brittle and hard; in the steel, point or spherical; not deformed during processing; such as quartz (SiO2), aluminosilicate (3Al2O3, 2SiO2) and calcium silicate .
(4), carbide non-uniformity: high carbon bearing steel carbon is high; and is enriched with a certain amount of carbide constituent elements (such as chromium). In the process of steel liquid condensation; these elements are prone to segregation of components; Lead to unevenness in the dispersion of carbides in steel.
Carbide liquid precipitation: molten steel in the crystallization process; because the cooling rate is too slow; constitutes a severe segregation of carbon components. It forms a coarse primary carbide between the dendrites; this primary carbide is difficult to eliminate. The direction of the strip is the same as that of the non-metallic inclusions; therefore, there is severe control in the technical standards of steel.
Carbide ribbon: its constituents are the same as carbide liquid precipitation. The coarse primary carbides that are broken during the casting and rolling process are gathered in small pieces and form a strip-like dispersion along the rolling direction. Carbide ribbon Severe will affect the heat treatment quality of the parts; make the parts of the parts less hot or overheated; the hardness of the parts is not uniform; the arrangement is uneven. The quality of the heat treatment of the parts is unqualified. When the carbide strips and carbides are severely analyzed; Bearing parts are fatigued early.
Carbide mesh: steel in the process of casting and rolling cooling; the solubility of austenite to carbon decreases with temperature. If the cooling rate is too slow between 800 and 900 °C, carbon is separated from austenite. And disperse the grain boundary; form a secondary carbide between the grain boundaries; exist in the form of a network; so it is called a carbide network. The carbide is a hard and brittle phase; the connectivity between the grains is damaged; The impact toughness of the steel is reduced. Thus; the life of the bearing parts is reduced.
Recommend to friends comments close window
| Bearing related knowledge |
| Linear bearing LM and LME code base meaning bearing operation trajectory and load method tumbling bearing oscillation type Japan Seiko listed robot with small low torque angle touch ball bearing KOYO motor bearing abnormal sound analysis and processing |
This article links to http://
Please indicate China Bearing Network http://
Previous: Detailed explanation of various fan bearing skills, choose quiet and efficient radiator, next edition: smooth bearing intention and effect of rolling bearing
Bread Basket,stainless wire basket,stainless wire bread basket,Metal Wire Bread Basket,steel bread basket,etc. we offered that you can trust. Welcome to do business with us.
Kichen Rack is made of high quality 304 stainless steel, This kind of material steel luxury, never rust, resist corruption, easily clean, safe, healthy and durable. Prevent rust or chemicals from contaminating food and damaging health
Stainless Steel Wire Bread Basket,Metal Wire Bread Basket,Creative Bread Basket,Versatile Bread Basket
Shenzhen Lanejoy Technology Co.,LTD , https://www.baking-rack.com