〒590-0982 大阪府堺市堺区海山町３丁158番地
SKK ready to hone and burnish type cylinder tubes enjoy good reputation among many customers.
Please consider to use the tubes to our own specifications as well as carbon steel tubes to JIS G3473 for cylinder barrels.
The notable features of this cylinder tube,ready to hone and burnish type
1.Tubes have uniform and stable mechanical properties.
2.Dimensional precision is excellent.We have paid special attention to inside diameter,roughness,and straightness.
3.The tubes having less strains can be obtained through the processes such as horning,burnishing,grinding,welding,drilling,and etc.,since the tubes are stress relieved after cold drawing process.
4.Shortening the time for processings contributes to the cost saving.
Specifications of horning ,burnishing type cylinder steel tube
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
| Inside diameter | Tolerance for inside diameter | Tolerance for inside diameter of burnishing | Wall thickness | Tolerance for wall thickness |
| 〜40 | −0.05 −0.15 | −0.20 −0.40 | 〜7.5 | ±10% |
| 41〜60 | −0.10 −0.20 | −0.20 −0.40 | 〜10.0 | |
| 61〜80 | −0.15 −0.25 | −0.20 −0.40 | 〜12.5 | |
| 81〜100 | −0.20 −0.35 | −0.30 −0.40 | 〜15.0 | |
| 101〜130 | −0.20 −0.35 | −0.40 −0.60 | 〜15.0 | |
| 131〜160 | −0.30 −0.50 | −0.60 −0.80 | 〜18.0 | |
| 161〜200 | −0.35 −0.60 | −0.60 −0.90 | 〜20.0 | |
| 201〜230 | −0.60 −0.90 | −0.60 −0.90 | 〜20.0 |
About JIS G3473 click here JISG3473.pdf
