GCr15 Bearing Steel Bar , Hot Rolled Alloy Bearing Steel Round Bar
GC15 is a high carbon, chromium containing low alloy steel that is
through hardening and noted in particular for use as bearings.
Used in roller bearings, rolls for metal, plastics, linoleum, etc
crushing rings, blanking dies, punches, forming tools, lathe
centres, gauges, cams, bushes marking dies, master hobs, hand taps.
Germany DIN 17230 WS 1.3505
Great Britain BS: 2S135, 535A99
U.S.A. AISI/SAE 52100
France AFNOR 35-565 100C6
Phosphorous 0.03 max
Sulphur 0.03 max
Delivery condition: Spheroidized annealed
Process: EAF+LF+VOD+ Rolled+Heat Treatment(optional)
Hot Rolled: 8mm-300mm
Hot rolled: Thickness: 20-130mm Width: less than 610mm
Hot forged: 200-800 mm
Black, Peeled (K12), Turned & Polished (H10, H11), Precision
Ground (H9, H8)
COLOUR CODE: Yellow End
Ultrasonic test: according to SEP 1921-84
Machinability of GCr15 alloy is good by conventional methods. A
spherodizing anneal at 1200 F before machining will improve the
overall machinability of the alloy.
GCr15 may be formed by all conventional methods, including cold
forging or stamping and hot or cold upset forming.
Heat treatment consists of heating to 1500 F followed by an oil
quench for through hardening of the alloy. A normalizing heat
treatment at 1600 F and slow cooling, to relieve machining stress,
may be employed prior to the 1500 F and quench treatment.
The alloy may be supplied as forgings and also may be subsequently
forged at 2200 F down to 1700 F
Hot working, such as upsetting, may be done in the range of 400 to
The alloy has good ductility and may be cold worked in the annealed
or normalized conditions by conventional methods.
Anneal at 1600 F and slow cool to relieve machining or cold working
Temper at 400 F.
The alloy hardens from cold working or by heating and quenching -
see "Heat Treatment". It also may be carburized at 1675 F and
quenched after sufficient time for carburization. A second heating
to 1450 F and second quench from that temperature should be used.
Certificate of Quality: issued in English, in addition the normal terms, production
process, the mechanical property (yield strength, tensile strength,
elongation and hardness), forged ratio, UT test result, Grain size,
heat treatment methods and the sample of is shown on the
Certificate of Quality.
Marking: Heat No. will be cold stamped and Steel grade, diameter (mm),
length (mm), and the manufacturer LOGO and weight (kg) is painted.