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| Place of Origin | Changzhou |
| Brand Name | Joyruns |
| Certification | ISO9001 |
| Model Number | STKM 13, 13A |
JIS3445 STKM11A precision cold drawing seamless steel tube
This steel is standard for application in mechanical engineering and for general technical purpose
Precision tubes for hydraulic systems, automobiles, machinery, and other precision steel pipe, finish, cleanliness, there are areas of high mechanical performance requirements.
STKM13A Seamless tubes Chemical composition
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Grade |
Designation |
Unit % |
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C |
Si |
Mn |
P |
S |
Nb or V |
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Grade 13 |
A |
STKM 13A |
0.25 max. |
0.35 max. |
0.30~0.90 |
0.040 max. |
0.040 max. |
– |
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B |
STKM 13B |
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JIS 3445 STKM 13A and STKM 13B Mechanical Properties:
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Standard |
Steel Grade |
Tensile Strength (MPa) |
Yield Point (MPa) |
Elongation(%) |
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JIS G3445 |
≥375 |
≥215 |
≥30 |
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≥440 |
≥305 |
≥20 |
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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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