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| Place of Origin | Changzhou |
| Brand Name | Joyruns |
| Certification | ISO9001 |
| Model Number | STKM 11, 11A |
JIS3445 STKM11A precision cold drawing seamless steel tube
Precision tubes for hydraulic systems, automobiles, machinery, and other precision steel pipe, finish, cleanliness, there are areas of high mechanical performance requirements.
Chemical Composition(%) & Mechanical Properties:
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Chemical Composition(%): |
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Standard |
Steel Grade |
C |
Si |
Mn |
P |
S |
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JIS G3445 |
STKM11A |
≤0.12 |
≤0.35 |
≤0.60 |
≤0.040 |
≤0.040 |
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Mechanical Properties: |
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Standard |
Steel Grade |
Yield Strength min.(Mpa) |
Tensile Strength min.(Mpa) |
Elongation A min.(%) |
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JIS G3445 |
STKM11A |
/ |
290 |
35 |
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Pipe Tolerance Table |
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Name |
Rang(mm) |
German Standard(mm) |
Corporate Internal Control Standards(mm) |
Special High-Precision(mm) |
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Outer Diameter |
4-30 |
±0.08 |
±0.05 |
±0.03 |
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31-40 |
±0.15 |
±0.05 |
±0.03 |
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41-50 |
±0.20 |
±0.08 |
±0.03 |
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51-60 |
±0.25 |
±0.08 |
±0.03 |
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Wall thickness |
0.5-7 |
±10% |
±10%,Min±0.05 |
±10%,Min±0.03 |
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Length |
+/-10mm |
Automotive industry pipe length can be cut according to customer requirements. |
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Heat treatment process delivery conditions: |
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Delivery Condition |
Heat Treatment Process |
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+C |
Cold drawn / hard. After the final cold forming no heat treatment. |
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+LC |
Cold drawn/soft. After the final heat treatment-limiting deformation, cold drawn, allowing a degree of cold deformation |
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+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. |
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+A |
In the final step of the steel pipe after cold deformation, placed in a controlled atmosphere furnace for annealing. |
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+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. |
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