PRODUCT NAME :
bearing steel
STANDARD:
GB/T18254-2002 ISO683-17
GRADE COMPARISION:
|
GB |
ASTM |
BS |
JIS |
|
G20CrNi2Mo |
4320H |
14 |
SNCM420 |
ULTRASONIC STANDARD:
GB/T6402-2008 / SEP921-84. ASTM A388
CHEMICAL COMPOSITION:
|
C |
Si |
Mn |
P≤ |
S≤ |
Cr |
Mo |
Ni |
|
0.17/0.23 |
0.15/0.40 |
0.40/0.70 |
0.03 |
0.03 |
0.35/0.65 |
0.20/0.30 |
1.60/2.00 |
HEAT TREATMENT SPECIFICATION:
Quenching : first time 880±20℃,second time 800±20℃,oil cooling 150～200℃,air cooling .
MECHANICAL PROPERTIES:
Metallographic structure :carburized layer is high carbon martensite , centeris low carbon martensite .
Impact test :αkv (J/cm2)：≥78(8)
DELIVERY CONDITION :
annealed
DIMENSION : mm
|
ROUND STEEL BAR |
COIL ROD |
WIRE |
SQUARE/ FLAT |
|
FORGED BAR |
ROLLED BAR |
HOT ROLLED |
COLD DRAW |
FORGED |
ROLLED |
|
100-700 |
16-250 |
∮5.5-20 |
∮0.2-13 |
120-800×120-800 |
5-38×44-150 10-90×60-305 |
APPLIED RANGE:
Alloy carburizing steel , the surface have fairly high hardness , abrasive resitance, contact fatigue stength, meanwhile in the centre ramaining
better tenacity and can bearing highly shock load . Main used for such as railway bearing etc impact resistance and stand wear and tear component.
REMARK：
Above listed parameters and sepcification only for reference . Specific parameters according to standard. Requirments beyond standard will be
negotiate by both sides .
Delivery state:annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc.
Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or industry
standards, or based on agreements with customers.
