Changzhou Joyruns Steel Tube CO.,LTD
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JIS3445 STKM13A precision cold drawing seamless steel tube
Suitable for carbon steel pipe used in machinery, automobile, bicycle, apparatus and other mechanical parts.
STKM 13 Chemical Composition (WT%)
| ST52 | E355 | STKM 13 | C≤ 0.25 | Si≤ 0.35 | Mn0.30 - 0.90 | P≤ 0.040 | S≤ 0.040 |
Mechanical Properties:
| Standard | Steel Grade | Tensile Strength (MPa) | Yield Point (MPa) | Elongation(%) |
| JIS G3445 | STKM 13A | ≥375 | ≥215 | ≥30 |
| STKM 13B | ≥440 | ≥305 | ≥20 |
| Pipe Tolerance Table | ||||
| Name | Rang(mm) | German Standard(mm) | Corporate Internal Control Standards(mm) | Special High-Precision(mm) |
| Outer Diameter | 4-30 | ±0.08 | ±0.05 | ±0.03 |
| 31-40 | ±0.15 | ±0.05 | ±0.03 | |
| 41-50 | ±0.20 | ±0.08 | ±0.03 | |
| 51-60 | ±0.25 | ±0.08 | ±0.03 | |
| Wall thickness | 0.5-7 | ±10% | ±10%,Min±0.05 | ±10%,Min±0.03 |
| Length | +/-10mm | Automotive industry pipe length can be cut according to customer requirements. | ||
| Heat treatment process delivery conditions: | |
| Delivery Condition | Heat Treatment Process |
| +C | Cold drawn / hard. After the final cold forming no heat treatment. |
| +LC | Cold drawn/soft. After the final heat treatment-limiting deformation, cold drawn, allowing a degree of cold deformation |
| +SR | Steel heat treatment is applied after the last cold deformation process, the result of state steel after due process, the residual stress deformation and machining makes a certain degree of difficulty increases. |
| +A | In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace for annealing. |
| +N | In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace at a temperature above the phase transition point to continue annealing. |
