The high carbon bearing steel wire are AISI440A,440B,440C. But the 440C is
very special grade with high content of "C " & "Cr" in Martensite stainless steel. As
high carbon & chromium , this grade has high strength and good resistance in
causticity environment. This grade is suit for making bearing steel ball, needle,
precision shaft, accessory etc.
Grade: AISI 440A, AISI 440B, AISI 440C
Deliver condition & available size
Cold drawn in coil size: 0.45mm--12.3mm coil I.D.: 400-550MM
Cold drawn in bar size: 2.0mm--12.0mm length:1500mm--4000mm
Cold drawn + Centerless Ground bar: 2.0mm--12.0mm length:1500mm--4000mm
Size tolerance: H11 or customer's technical request
Roundness: not more than 1/2 size tolerance
Grade contrast table:
|
Stainless steel grade contrast |
| GB |
JIS |
AISI |
DIN |
| 7Cr17 |
SUS440A |
440A |
|
| 8Cr17 |
SUS440B |
440B |
|
| 9Cr18, 9Cr18Mo |
SUS440C |
440C |
|
Chemical composition table:
| Chemical composition table |
| Grade |
composition (%) |
| C |
Si |
Mn |
P |
S |
Cr |
Mo |
|
AISI440A |
0.60-0.75 |
≤1.00 |
≤1.00 |
≤0.040 |
≤0.03 |
16.0-18.0 |
≤0.75 |
|
AISI440B |
0.75-0.95 |
≤1.00 |
≤1.00 |
≤0.040 |
≤0.03 |
16.0-18.0 |
≤0.75 |
|
AISI440C |
0.95-1.20 |
≤1.00 |
≤1.00 |
≤0.040 |
≤0.03 |
16.0-18.0 |
≤0.75 |
Note: The grade can refer as Grade contrast.
AISI 440 mechnical property table:
| Heat treatment |
σb
MPa |
σs
MPa |
σ5
% |
￠
% |
HRC |
ak
100 kJ/m2 |
| 1000~1050°C quenching in oil and 200~300°C tempering in oil or tempering in air |
-- |
-- |
-- |
-- |
>58 |
|
| Annealing condition |
755 |
-- |
14 |
27.5 |
HB
230~240 |
1.57 | |
