1.Chemical composition
| Grade | C | Si | Mn | P | S | |
| JIS | STKM13C | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.010max |
|
SKK original standards |
SKCY510E | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.010max |
| SKCY540E | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.010max | |
| SKCY590E | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.010max | |
2.Mechanical properties
|
Grade |
Tensile strength (N/mm2) |
Yield point (N/mm2) |
Elongation (%) |
|
|
JIS |
STKM13C |
510min |
380min |
15min |
|
SKK original standards |
SKCY510E |
510min |
380min |
15min |
|
SKCY540E |
540min |
490min |
15min |
|
|
SKCY590E |
590min |
490min |
15min |
|
3.Tolerances for dimensions (mm)
|
Inside diameter |
Tolerance for inside diameter |
Wall thickness |
Tolerance for wall thickness |
Roundness | Straightness |
|
〜40 |
+0 −0.10 |
〜7.5 |
±8% |
0.05max | 0.5/1000 |
|
41〜60 |
+0 −0.15 |
〜7.5 |
0.08max | ||
|
61〜100 |
+0 −0.20 |
〜9.5 |
0.10max | ||
|
101〜150 |
+0 −0.30 |
〜12.5 |
0.15max | ||
|
151〜200 |
+0 −0.50 |
〜15.0 |
0.20max |
Tolerances for inside diameter of burnishing will be considered upon request.
