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618 series deep groove ball bearing

Basic Info

Model No.61821


Additional Info

PackagingStandard export packaging



Place of OriginChina

Supply Ability12000pcs/month


HS Code8482200000

PortShanghai,Qingdao,Other Chinese Ports

Payment TypeL/C,T/T,Paypal


Delivery Time30 Days

Product Description

Main factors affecting metal corrosion
(1) internal factors of metal corrosion
From a thermodynamic point of view, metals and their corrosion products have higher energy and are unstable, and have the tendency of spontaneous transformation to low energy corrosion products, that is, metal corrosion is a natural phenomenon. Most of the industrial metal is a multicomponent alloy, microstructure, impurities, machining deformation is not uniform, uniform stress distribution, uniformity of these physical, chemical and electrochemical corrosion, when encountered surface or water film formed on the surface, will inevitably occur in chemistry or electrochemical corrosion.
(two) external factors of metal corrosion
1. shadow of relative temperature
The higher the relative humidity in the air, the thicker the water film on the surface of the metal, and the oxygen in the air acts through the water film to the metal surface. When the relative humidity reaches a certain value, the corrosion rate increases greatly. This value is called the critical relative humidity, and the critical relative humidity of steel is about 70%.
2. effect of temperature
The ambient temperature is associated with relative humidity. Under the dry environment (desert), the temperature and the high metal are not easy to rust. When the relative humidity reaches the critical value, the effect of temperature increases obviously, and the corrosion rate increases by two times when the temperature increases at 10 degrees C. Therefore, in the wet or rainy season, the higher the temperature, the more serious the corrosion.
The effect of 3. oxygen
The following reaction is used to indicate the process of rust:
Fe+H2O - Fe (OH) 2
Fe (OH) 2+ H2O+O2 - Fe (OH) 3
Fe+ H2O+O2 - Fe (OH) 3
It can be seen that without water and oxygen, the metal will not rust, the 20% volume of air in the air is oxygen, it is all pervasive.
4. influence of other substances in the atmosphere
Atmospheric salt fog, sulfur dioxide, hydrogen sulfide and dust will accelerate corrosion. Therefore, the size of corrosion is obviously different under different environments. The urban area is higher than the rural area, the industrial area is higher than the living area, the coastal area is higher than the inland area, and the high dust is higher than the low dust.
(three) corrosion factors in the process of processing

The raw material is corroded, after processing failed to complete the removal; processing with cutting fluids, lubricants and other materials; after pickling and washing; heat treatment or residual salt oxidation and decarburization cleaning; inspection, handling and assembly when the operator left hand sweat; to stress or to hydrogen annealing process and improper; not suitable for storage antirust etc.

deep groove 61821

61821 deep groove ball bearings can be used for sewing shoes: handle, standard sieve, electrophoresis tank, storage machine, weaving machine, boring machine, sedimentation tank, nonclog pump, food shop equipment, plastic calendering machine, frozen food processing equipment, heat exchanger, air conditioning pump, drilling machine, bending machine, mold temperature machine use, grinder, etc..

deep groove 618211

Model: 618/8 Single Row Deep Groove Ball Bearing
Brand: AUTO
Series: deep groove ball bearings, single row, no seals
Shape size
d: 100
D: 125
B: 13
Luoyang Auto Bearing Co., Ltd. is located in the industrial park of Luoyang,which is one of the four great ancient capitals of China.Our company is the member of China Bearing Industry Association,cooperating with State Quality Supervision and Testing Center for bearing.Our company is a professional bearing manufacturer which integrated with research ,development and marketing services.
Our major products include deep groove ball bearing, spherical Roller Bearing, slewing ring, crossed roller bearing and other all kinds of high precision bearings.Our products are widely applied to motor industry,mining metallurgy,wind power generation,petroleum drilling,automobile and motorcycle etc..
Our company not only possesses advanced bearing manufacturing equipments and international first-class measuring instruments, but also has strong strength of manufacturing, inspecting and testing the high precision and reliability bearings.Each process is in strict accordance with the ISO9001 quality management system,which effectively guarantees the precise of products and stability of the performance. AUTO bearings are mainly exported to the United states,South Korea,Europe,etc., which have reached the high level of foreign similar products.
The soul of our business culture is [Detail makes competitive, innovation makes first-class".We believe the production and management philosophy of [quality wins ,casting competitive products".The company adheres to the zero-defect quality management for meeting customer requirements.

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Product Categories : Deep Groove Ball Bearing > Single Row Deep Groove Ball Bearing

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  • 618 series deep groove ball bearing
  • 618 series deep groove ball bearing
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