DIN 1629 Carbon Seamless Steel Pipes
DIN 1629 carbon seamless steel pipes are cylindrical pipes manufactured from non-alloy materials designed to meet specific quality requirements. These pipes come in three primary grades: DIN 1629 ST 37.0, 44.0, and 52.0. Each grade differs in terms of chemical composition and mechanical properties. Depending on their grade, these pipes can be utilized in the production of pipes, vessels, equipment, fittings, and various other applications. Available in a wide range of sizes, these pipes have outer diameters that span from 10 mm to 324 mm, wall thicknesses ranging from 1 mm to 30 mm, and lengths up to 14,000 mm. The material composition of DIN 1629 includes carbon, silicon, manganese, phosphorus, and sulfur. While the ST52.0 grade contains both silicon and manganese, the other grades do not. The carbon content varies across the grades, with ST37.0 at 0.17%, ST44.0 at 0.21%, and ST52.0 at 0.22%. These differences in carbon content directly impact the strength characteristics of the pipes. For instance, the minimum yield strength of ST37.0 is 235 MPa, with a tensile strength of up to 480 MPa; ST44.0 has a minimum yield strength of 275 MPa and a tensile strength of up to 550 MPa; and ST52.0 boasts a minimum yield strength of 355 MPa and a tensile strength of up to 650 MPa. Among the three grades, ST52.0 is considered the highest grade and also the most expensive. These pipes can undergo various heat treatments such as hot rolling, cold working, stress relief, annealing, or normalizing to enhance the product's hardness.
DIN 1629 Seamless Pipe Specifications
| Standard | DIN 1629 |
| Grade | ST52 |
| Size in MM | 4 To 190 x Wall Thickness 0.5 To 15 |
| Outer Dimensions in MM | 4 To 60 |
| Wall Thickness in MM | 0.5 To 8 |
| Schedule | Schedule XS, Schedule 160, Schedule 40, Schedule XXS, Schedule 80 Supplier and Manufacturer |
|---|---|
| Length in MM | 6000 |
| Pipe Marking | All Pipe are marked as follows: Supplier or Manufacturer’s Name, Standard, Grade, OD, Thickness, Length, Heat Number |
Chemical Properties of DIN 1629 St52.0 Carbon Steel Pipes & Tube
| Symbol | Material Number | C | P | S | N¹) |
|---|---|---|---|---|---|
| St37.0 | 1.0254 | 0.17 | 0.040 | 0.040 | 0.009²) |
| St44.0 | 1.0255 | 0.21 | 0.040 | 0.040 | 0.009²) |
| St52.0³) | 1.0421 | 0.22 | 0.040 | 0.035 | - |
DIN 1629 Pipe Mechanical Composition
| Steel Grade | Upper Yield Stress ReH for wall thickness, in mm, |
Tensile strength Rm N/mm² |
Elongation(%) A5 | ||||
|---|---|---|---|---|---|---|---|
| Symbol | Material Number | up to 16 | over 16 up to 40 | over 40 up to 65 | Longitudinal | Transverse | |
| St 37.0 | 1.0254 | 235 | 225 | 216 | 350²) to 480 | 25 | 23 |
| St 44.0 | 1.0256 | 275¹) | 265¹) | 255¹) | 420²) to 550 | 21 | 19 |
| St 52.0 | 1.0421 | 355 | 345 | 335 | 500²) to 650 | 21 | 19 |
DIN 1629 Equivalent ASTM
| DIN 1629 | EN | BS NFA 49.210/49.112 | ASTM 53 |
|---|---|---|---|
| Grade St 37 | EN 10216.1Grade P235 T1 | Grade TU 37 B TU E 220 A | Grade B |
| Grade St 44 | EN 10216.1Grade P275T1 | Grade TU 42 B TU E 235 A | Grade B |
| Grade St 52-0 | EN 10216-3Grade P355N | NFA Grade P355N | ASME SA 381 Grade Y 52 |
Temperature Range of DIN 1629 Pipes
| Steel Grade | Yield stress value by working temperature(Thickness increasing) | |||
|---|---|---|---|---|
| 50℃ | 200℃ | 250℃ | 300℃ | |
| St 37 | 235-215 | 185-170 | 165-150 | 140-130 |
| St 44 | 275-255 | 215-200 | 195-180 | 165-155 |
| St 52 | 355-335 | 248-230 | 225-210 | 195-185 |
Sizes of DIN 1629 Pipes
- Wall Thickness in MM: 1 To 30
- Outer Diameter in MM: 10 To 324
- Length in MM: 14000
Check dimensions, tolerance and specification of DIN 1629 Seamless Tubes
Tolerance Chart of DIN 1629 Seamless Tubes
| Execution | Size Range | OD Tolerance | Wall tolerance |
| Hot-rolled Tube | OD – 80 mmOD > 80 mmWall < 12 mmWall - 12 mm | ± 0.4 mm± 0.5 % of OD | ± 0.7 mm± (5 % x wallthickness + 0.1 mm |
| Hot-rolled peeled tube | All sizesWall < 12 mmWall - 12 mm | + 0.25/- 0 mm | ± 0.8 mm± (5 % x wall thickness+ 0.2 mm) |
| Cold Worked tubecold-rolled or cold-drawn | OD < 40 mmOD 40 - 80 mmOD > 80 Wall Thickness< 6 mm Wall Thickness6 - 8 mm Wall Thickness > 8 | + 0.30/- 0 mm*+ 0.35/- 0 mm*+ 0.40/- 0 mm* | ± 0.30 mm± 0.35 mm± 0.40 mm |
DIN 1629 st 52 Length
| Component length (mm) | Outer Diameter 30 To 100 mm | Outer Diameter 100 To 254 mm |
| 10-100 | + 1.0/- 0 | + 2.0/- 0 |
| 600-1200 | + 3.0/- 0 | + 4.0/- 0 |
| 100-600 | + 2.0/- 0 | + 3.0/- 0 |
| 1200-5000 | + 5.0/- 0 | + 6.0/- 0 |
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