1.Chemical composition
| Grade | C | Si | Mn | P | S | |
| JIS | STKM13C | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.040max |
|
SKK original standards |
SKCY510 | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.040max |
| SKCY540 | 0.17〜0.25 | 0.35max | 0.30〜0.90 | 0.040max | 0.040max | |
| SKCY590 | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.040max | |
| SKCY690 | 0.17〜0.22 | 0.80max | 1.65max | 0.035max | 0.035max | |
2.Mechanical properties
|
Grade |
Tensile strength (N/mm2) |
Yield point (N/mm2) |
Elongation (%) |
|
|
JIS |
STKM13C |
510min |
380min |
15min |
|
SKK original standards |
SKCY510 |
510min |
380min |
15min |
|
SKCY540 |
540min |
430min |
15min |
|
|
SKCY590 |
590min |
490min |
15min |
|
|
SKCY690 |
690min |
590min |
15min |
|
3.Tolerances for dimensions （ｍｍ）
|
Inside diameter |
Tolerance for inside diameter |
Wall thickness |
Tolerance for wall thickness |
length |
|
〜50 |
+0.20 +0.50 |
〜10 |
±10% |
〜6,000 |
|
51〜80 |
+0.20 +0.60 |
〜10 |
〜8,000 | |
|
81〜120 |
+0.30 +0.80 |
〜15 |
〜10,000 | |
|
121〜160 |
+0.40 +1.00 |
〜20 |
〜10,000 | |
|
161〜200 |
+0.60 +1.00 |
〜20 |
〜10,000 | |
|
201〜260 |
+0.80 +1.00 |
〜20 |
〜10,000 |
