ST52 Pipes are high-strength carbon-manganese steel pipes and tubes produced to the German DIN standards — DIN 1629 St 52.0 for seamless circular tubes and DIN 2391 St 52 for cold drawn precision tubes (now EN 10305-1 E355). With a minimum yield strength of 355 MPa, ST52 carries considerably more load than ordinary carbon steel pipe while remaining easy to machine and weld.
Sarovar Tube Industries supplies ST52 seamless and cold drawn pipes from Mumbai for hydraulic cylinders, honed tubes, machine building and heavy engineering. Pipes are supplied in the normalised (+N) or cold drawn and stress relieved (+SR) condition with close OD and ID tolerances, backed by EN 10204 3.1 mill test certificates.
The table below sets out the standard supply range for ST52 Pipes. Sizes and finishes outside this range are supplied against firm orders.
| Parameter | Details |
|---|---|
| Size Range | 6 mm to 610 mm OD (up to NPS 24 inch) |
| Wall Thickness | 1 mm to 60 mm |
| Length | Random 4-7 m, fixed lengths up to 12 m, cut lengths on request |
| Type | Seamless hot finished, cold drawn precision, honed / skived and roller burnished |
| Delivery Condition | +N (normalised), +SR (stress relieved), +C / BK, +A |
| End Finish | Plain end, bevelled end |
| Surface | Black, phosphated, oiled, honed ID |
| Tolerance | As per DIN 2391 / EN 10305-1, ISO H8 / H9 ID for honed tubes |
| Description | Details |
|---|---|
| Primary Standard | DIN 1629 St 52.0 / DIN 2391 St 52 |
| European Equivalent | EN 10305-1 E355, EN 10297-1 E355, EN 10025 S355 |
| Other Equivalents | DIN 1630 St 52.4, ASTM A519 1026 (close), BS 6323 CDS 4 (close) |
| Product Category | Carbon Steel - Seamless Pipes |
| Certification | EN 10204 3.1 as standard, 3.2 with third party inspection on request |
| OD Range (mm) | Approx. NPS (inch) | Wall Thickness (mm) | Typical Type / Condition |
|---|---|---|---|
| 6 - 25 | up to 3/4 | 1.0 - 5.0 | Cold drawn precision, +C / +SR |
| 26 - 50 | 3/4 - 1 1/2 | 1.5 - 10.0 | Cold drawn, +SR / +N |
| 51 - 89 | 1 1/2 - 3 | 2.0 - 16.0 | Cold drawn / hot finished, +SR / +N |
| 90 - 168.3 | 3 - 6 | 3.0 - 25.0 | Hot finished seamless, +N |
| 169 - 273 | 6 - 10 | 5.0 - 40.0 | Hot finished seamless, +N |
| 274 - 406.4 | 10 - 16 | 8.0 - 50.0 | Hot finished seamless, +N |
| 407 - 610 | 16 - 24 | 10.0 - 60.0 | Hot finished seamless, +N |
ST52 is ordered by OD x wall thickness (or ID x OD for hydraulic tube). Sizes up to 610 mm OD (NPS 24 inch) are supplied; ASME B36.10M schedule sizes are also available — refer to our catalogue for the complete chart.
Composition limits in weight percent as per DIN 2391 St 52 / EN 10305-1 E355. Every heat is verified by spectrographic analysis.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.22 max |
| Silicon (Si) | 0.55 max |
| Manganese (Mn) | 1.60 max |
| Phosphorus (P) | 0.025 max |
| Sulphur (S) | 0.025 max |
Minimum room temperature properties as per EN 10305-1 E355 for the delivery condition supplied.
| Property | Value |
|---|---|
| Tensile Strength (+N) | 490 - 630 MPa |
| Yield Strength (+N) | 355 MPa min |
| Elongation (+N) | 22% min |
| Tensile Strength (+SR) | 580 MPa min |
| Yield Strength (+SR) | 450 MPa min |
| Elongation (+SR) | 10% min |
| Density | 7.85 g/cm3 |
Material is released only after the following checks are completed and recorded:
ST52 Pipes are specified across the following industries and services:
ST52 is a high-strength carbon-manganese steel grade from the German DIN standards (DIN 1629 / DIN 2391), now designated E355 under EN 10305-1. It has a minimum yield strength of 355 MPa.
ST52 has a higher manganese content and a minimum yield strength of 355 MPa compared with about 235 MPa for ST37, so it is used where higher pressure or load has to be carried with the same wall thickness.
Yes. Cold drawn ST52 tube in the +SR condition is the standard material for hydraulic cylinder barrels and is supplied honed or skived and roller burnished to ISO H8 / H9 ID tolerance.
Every consignment ships with an EN 10204 3.1 mill test certificate covering chemical analysis and mechanical properties. Type 3.2 certification with third party inspection is available on request.
Custom fabrication, special sizes and complete export documentation are handled in house. Send us your drawing or specification and our technical team will come back with a detailed offer, usually within one working day.