DIN2391 ST37 Properties carbon seamless steel pipe and tube

German Standard:
| Product Name |
Executive Standard |
Specificaiton Range (mm) |
Steel Grade |
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|
Cold drawn seamless precision tube |
DIN2391 | Φ3~80 x 0.5~8 |
ST35,ST37.4,ST44, ST45,ST52 |
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Tolerance Table of Steel Tube:
|
NAME |
Scope (mm) |
DIN series(mm) |
|
Out Diameter |
3-30 |
±0.08 |
|
31-40 |
±0.15 |
|
|
41-50 |
±0.20 |
|
|
51-60 |
±0.25 |
|
|
Wall Thickness |
0.5-8 |
±10% |
Mechanical Property:
|
Standard |
Steel Grade |
Mechanical Performance |
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|
GBK(+A) |
NBK(+N) |
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|
Tensile Strength (Rm mpa) |
Elongation rate (A5 %) |
Tensile Strength (Rm mpa) |
Yield Strength (Reh mpa) |
Elongation rate (A5 %) |
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|
DIN 2391 |
St35 |
≥315 |
≥25 |
346-478 |
≥235 |
≥25 |
|
St37 |
≥315 |
≥25 |
346-478 |
≥235 |
≥25 |
|
|
St37.4 |
≥315 |
≥25 |
346-478 |
≥235 |
≥25 |
|
|
St45 |
≥390 |
≥21 |
440-570 |
≥255 |
≥21 |
|
|
St44 |
≥390 |
≥21 |
440-570 |
≥255 |
≥21 |
|
|
St52 |
≥490 |
≥22 |
490-630 |
≥355 |
≥22 |
|
Other Specification:
|
End Shape |
Beveled end, plain end, vanished, or adding plastic caps to protect the two ends as per custom er's requirements |
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Surface Treatment |
Oiled, Galvanized, Phosphate etc |
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|
Technique |
Cold drawn |
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|
Application |
1. Automotive and mechanical |
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2. Petroleum cracking |
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3. High Pressure Boiler Pipe |
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4. Low and middle pressure fluid transportation pipeline |
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5. Chemical fertilizer equipment |
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6. Heat exchanger |
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Delivery Conditions |
1. BK (+C) |
No heat treatment after last cold forming process. |
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2. BKW (+LC) |
After last heat treatment there is a light finishing pass (cold drawing) |
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3. BKS (+SR) |
After the final cold forming process the tubes are stress relieve annealed. |
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4. GBK (+A) |
After the final cold forming process the tubes are annealed in a controlled atmosphere. |
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5. NBK (+N) |
After the final cold forming process the tubes are annealed above the upper transformation poi nt in a controlled atmosphere. |
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Package |
1. Bundle Packing. |
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2. Plain end or vanished as per customer's request. |
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3. Wrapped in waterproof paper. |
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4. Sackcloth with several steel strips. |
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5. Pack in heavy tri-wall boxes. |
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