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ASTM A295 is specification which covers 52100 high carbon bearing quality steelto be used in the manufacture of anti-friction bearings. And 52100 bearing steel is the most common steel grade in ASTM A295 standard for high-carbon anti-friction bearing steel. What is 52100 bearing steel? AISI/ASTM 52100 bearing steel is a high carbon, chromium containing low alloysteel that is through hardening and noted in particular for use asbearings. 52100 bearing steel is one kind of special steel with ...
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is specification which covers 52100 high carbon bearing quality steel
to be used in the manufacture of anti-friction bearings. And is the most common steel grade in ASTM A295 standard for high-carbon anti-friction bearing steel.
What is 52100 bearing steel?
52100 bearing steel is a high carbon, chromium containing low alloy
steel that is through hardening and noted in particular for use as
52100 bearing steel is one kind of special steel with features of
high wear resistance and rolling fatigue strength. High-carbon chromium
bearing steel, engineering steel and some types of stainless steel and
heat resistant steel are used as materials of bearings and for other
Advantages of Chrome Bearing Steel 52100:
Superior hardness, 60-67 on Rockwell hardness scale (Rc) at room temperature
High carbon chrome alloy steel
Operates continually at temperatures up to 120°C
Used to produce precision ball bearings and roller bearings
Long working life
1. Relevant Steel Specification of ASTM 52100 Bearing Steel
|Standard||ASTM A295||DIN 17230|
2. Chemical Composition of 52100 Bearing Steel and Equivalents
3. Mechanical Properties of ASTM A295 52100 Bearing Steel
|Bulk modulus (typical for steel)||140 GPa||20300 ksi|
|Shear modulus (typical for steel)||80 GPa||11600 ksi|
|Elastic modulus||190-210 GPa||27557-30458 ksi|
|Hardness, Knoop (converted from Rockwell C hardness)||875||875|
|Hardness, Rockwell C (quenched in oil from 150°C tempered)||62||62|
|Hardness, Rockwell C (quenched in water from 150°C tempered)||64||64|
|Hardness, Rockwell C (quenched in oil)||64||64|
|Hardness, Rockwell C (quenched in water)||66||66|
|Hardness, Vickers (converted from Rockwell C hardness)||848||848|
|Machinability (spheroidized annealed and cold drawn. Based on 100 machinability for AISI 1212 steel)||40||40|
52100 Steel Physical Properties
|Density||7.81 g/cm3||0.282 lb/in³|
52100 Alloy Steel Thermal Properties
|Thermal expansion co-efficient (@ 23-280°C/73.4- 36°F, annealed)||11.9 µm/m°C||6.61 µin/in°F|
|Thermal conductivity (typical steel)||46.6 W/mK||323 BTU in/hr.ft².°F|
4. Forging of A295 52100 Bearing Steel
52100 alloy steel is forged at 927 to 1205°C, and should not be forged
below 925ºC. A post-forge equalization treatment is recommended at 745ºC
for 4-6 hours followed by air cooling for SAE/AISI 52100 steel.
6. Heat Treatment for ASTM 52100 Bearing Steel
52100 alloy bearing steel is heated at 816°C followed by quenching in
oil. Before performing this process, it is subjected to normalizing heat
treatment at 872°C followed by slowly cooling in order to reduce the
AISI 52100 bearing steels alloy can be hot worked at 205 to 538°C.
AISI 52100 bearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.
For spheroidize anneale, the following isothermal anneal is recommended:
1500ºF (815ºC) for 3 hours
1350ºF (735ºC) for 4 hours
1250ºF (675ºC) for 3 hours
Slow cool to 1000ºF (540ºC) then air cool.
AISI 52100 alloy bearing steel could be hardened by quenching in water from 801-829 degree or quench in oil from 816-842 degree.
Temper to desired hardness as indicated by tempering curves after water or oil quench.
5. Applications of 52100 Bearing Steel
steel 52100 grade bearing steel is mainly used for the manufacture of
aircraft bearings and other highly stressed parts. This steel grade
52100 steel is preferably vacuum arc re-melted to give optimum
Typical applications: Bearing Manufacture, CV joints, ball screws, gauges, knife etc.
Sensei Phu stated the tempering course of action
Tempering is a warmth treatment method procedure for metals, alloys and glass. In steels, tempering is finished to “toughen” the metallic by transforming brittle martensite or bainite into a mixture of ferrite and cementite or often Tempered martensite. Precipitation hardening alloys, like several grades of aluminum and superalloys, are tempered to precipitate intermetallic particles which improve the metallic. Tempering is achieved by a controlled reheating of the work piece to a temperature below its decreased vital temperature.
Tamahagane (玉鋼:たまはがね?) is a kind of Japanese metal. Translated as “jewel metal”, it is generally used to make Samurai swords, this sort of as the katana, and some applications. The metal is created from black sand.
The smelting course of action used is various from the fashionable mass generation of metal. A clay vessel about four ft (one.two m) tall, 12 ft (three.7 m) extensive, and four ft (one.two m) extensive is made. This is recognised as a tatara. Immediately after the clay tub has set, it is fired till dry. A charcoal fireplace is begun from delicate pine charcoal. Then the smelter will hold out for the fireplace to access the proper temperature. At that level he will direct the addition of iron sand recognised as satetsu. This will be layered in with much more charcoal and much more iron sand in excess of the future 72 hours. 4 or five folks want to regularly work on this course of action. It normally takes about a week to construct the tatara and entire the iron conversion to metal. When the course of action is finished they will split the clay tub and take out the metal bloom recognised as a kera. At the conclusion of the course of action the tatara will have eaten about 10 quick tons (nine.one t) of satetsu and 12 quick tons (eleven t) of charcoal leaving about two.five quick tons (two.three t) of kera, from which less than a ton of tamahagane can be developed.[one]
The swordsmiths will very carefully split the kera apart, and individual the a variety of carbon steels. The most affordable carbon metal is identified as hocho-tetsu, which is used for the shingane, (translated as “core-metal”) of the blade. The substantial carbon tamahagane and higher carbon metal, identified as nabe-gane, will then be cast in alternating layers, applying quite intricate methods to kind the kawagane (or, “pores and skin metal”). The most useful course of action is the folding, exactly where the metals are forge welded, folded, and welded once more, as several as 16 situations. The folding eliminates impurities and will help even out the carbon content, while the alternating layers blend hardness with ductility to generate toughness.[two][three][four] Usually, tamahagane is only created 3 or 4 situations a yr by Nittoho and Hitachi Metals[five] in the course of winter in a wooden creating and is only bought to the learn swordsmiths to use once it is created.
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