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Help CenterDIN 1629 Seamless Non-Alloy Steel Tubes With Special Requirements
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With Special Requirements – Grades St37.0, St44.0, St52.0
German Standard – Pressure Purposes – Replaced by EN 10216-1
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DIN 1629 Seamless Non-Alloy Steel Tubes
With Special Requirements
German Standard – Pressure Purposes – Replaced by EN 10216-1
Product Overview
DIN 1629 is the German standard for seamless circular non-alloy steel tubes with special requirements. These tubes are intended for pressure purposes and applications requiring higher quality, performance, and reliability, such as chemical equipment, pressure vessels, and piping systems.
The standard covers three main strength grades:
St37.0 (1.0254) – General purpose pressure tube
St44.0 (1.0256) – Higher strength pressure applications
St52.0 (1.0421) – High strength, heavy duty applications
⚠️ Important Note: DIN 1629 has been withdrawn and replaced by EN 10216-1 (P235TR2/P265TR2/P355N). We supply to this standard for legacy replacement, maintenance, and retrofit projects where the old German standard is still specified.
✅ DIN 1629 compliant – Supplied to withdrawn standard for legacy projects
✅ Seamless construction – Pressure integrity assured
✅ Special requirements – Enhanced quality for pressure purposes
✅ Three strength grades – St37.0, St44.0, St52.0
✅ Hot finished or cold drawn – Depending on size and application
✅ 100% hydrostatic tested – Per standard requirement
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Stock available for legacy replacement | Fast delivery
Key Specifications
| Parameter | Details |
|---|---|
| Standard | DIN 1629-1984 (withdrawn – replaced by EN 10216-1) |
| Product Type | Seamless Non-Alloy Steel Tube – Special Requirements |
| Grades | St37.0 (1.0254), St44.0 (1.0256), St52.0 (1.0421) |
| Size Range | 10mm – 610mm OD |
| Wall Thickness | 1.5mm – 50mm+ |
| Length | 4m – 7.5m (commercial length); up to 12m (manufacturing length, by agreement) |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
| Delivery Condition | Untreated (as rolled), normalized, or stress relieved |
📌 Temperature limitation: Generally, the working temperature is limited to below 300°C (572°F). The standard does not specify a working pressure limit.
Steel Grade Overview – DIN 1629
| Grade | Material No. | EN 10216-1 Equivalent | Min Yield (MPa) | Tensile (MPa) | Typical Application |
|---|---|---|---|---|---|
| St37.0 | 1.0254 | P235TR2 | 235 | 350-480 | General pressure purposes |
| St44.0 | 1.0256 | P265TR2 | 275 | 420-550 | Higher strength applications |
| St52.0 | 1.0421 | P355N | 355 | 500-650 | High strength, heavy duty |
💡 St52.0 is the most commonly requested grade for high strength applications.
Chemical Composition – DIN 1629 Grades
| Grade | C max | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| St37.0 | 0.17 | 0.17-0.37 | 0.35-0.65 | 0.040 | 0.040 |
| St44.0 | 0.21 | 0.17-0.37 | 0.50-0.80 | 0.040 | 0.040 |
| St52.0 | 0.22 | ≤0.55 | ≤1.60 | 0.040 | 0.035 |
💡 St52.0 has a maximum carbon content of 0.22% and manganese up to 1.60%, providing excellent strength while maintaining weldability.
Mechanical Properties – DIN 1629 Grades
| Grade | Tensile Strength (MPa) | Yield Strength min (MPa) – by wall thickness | Elongation min (%) | |||
|---|---|---|---|---|---|---|
| ≤16mm | 16-40mm | 40-65mm | Longitudinal | Transverse | ||
| St37.0 | 350-480 | 235 | 225 | 216 | 25 | 23 |
| St44.0 | 420-550 | 275 | 265 | 255 | 21 | 19 |
| St52.0 | 500-650 | 355 | 345 | 335 | 21 | 19 |
💡 Yield strength decreases with increasing wall thickness – thicker walls require lower yield strength acceptance.
Dimensional Tolerances – DIN 1629
Outer Diameter Tolerances:
| OD Range (mm) | Tolerance |
|---|---|
| ≤50 | ±0.5 mm |
| >50 | ±1.0% |
Special Tolerances for Tube Ends (by agreement):
| OD Range (mm) | Tolerance |
|---|---|
| 45-100 | ±0.4 mm |
| 100-200 | ±0.5% |
| >200 | ±0.7% |
Wall Thickness Tolerances:
| OD Range | Basic Tolerance | Local Tolerance |
|---|---|---|
| ≤130 mm | ±10% | -15% |
| 130-325 mm | ±12.5% | -17.5% |
| >325 mm | By agreement | By agreement |
Length Tolerances:
| Length Type | Range | Tolerance |
|---|---|---|
| Commercial length | 4-7.5 m | ±500 mm |
| Fixed length | ≤6 m | +10 mm |
| Fixed length | >6 m | +15 mm |
Grade Selection Guide – DIN 1629
| Application | Recommended Grade | Tensile (MPa) | Yield (MPa) |
|---|---|---|---|
| General pressure purposes | St37.0 | 350-480 | ≥235 |
| Higher strength requirements | St44.0 | 420-550 | ≥275 |
| High strength, heavy duty | St52.0 | 500-650 | ≥355 |
Applications – DIN 1629 Tubes
| Industry | Application | Recommended Grade |
|---|---|---|
| Pressure Equipment | Pressure vessels, air receivers | St37.0, St44.0 |
| Piping Systems | Steam, water, air lines (≤300°C) | St37.0, St44.0 |
| Machine Building | Hydraulic and pneumatic cylinders | St52.0 |
| Chemical Equipment | Process piping, heat exchangers | St44.0, St52.0 |
| Construction | Structural components, supports | St52.0 |
| Legacy Replacement | Old German-specified systems | All grades |
📌 Temperature limitation: Generally limited to below 300°C (572°F).
Production Requirements – DIN 1629
Manufacturing Methods:
Hot finished – Hot rolled, hot extruded, or hot drawn
Cold finished – Cold drawn or cold rolled (requires subsequent heat treatment)
Heat Treatment Requirements:
Hot finished tubes – Generally supplied in as-rolled condition
Cold finished tubes – Must be annealed or stress relieved
All tubes requiring flaring operations at the ends must be soft annealed at the tube ends
Surface Quality:
Inner and outer surfaces shall be smooth
Minor surface imperfections permitted within dimensional tolerances
Defects may be removed by grinding if wall thickness remains within tolerance
No weld repair permitted
Testing and Inspection – DIN 1629
| Test | Requirement | Coverage |
|---|---|---|
| Hydrostatic Test | All tubes – pressure typically 40 bar (4 MPa) | 100% |
| Tensile Test | Per batch (100 tubes) | Per heat/lot |
| Flattening Test | For small diameter thin wall tubes | Per lot |
| Flaring Test | For medium size tubes | Per lot |
| Ring Tensile Test | For large diameter thick wall tubes | Per lot |
| Visual Examination | 100% | 100% |
| Dimensional Inspection | 100% | 100% |
💡 Hydrostatic testing is mandatory for all tubes per DIN 1629 requirements.
Quality Levels – Nomenclature Explanation
The naming system for DIN 1629 grades indicates quality level based on impact testing:
| Suffix | Description |
|---|---|
| .0 | No Charpy impact test required |
| .2 | Impact tested at +20°C |
| .3 | Impact tested at 0°C |
Example: St52.3 requires Charpy impact testing at 0°C, whereas St52.0 does not.
EN 10216-1 Equivalent – DIN 1629 to Current Standard
| DIN 1629 Grade | EN 10216-1 Equivalent | Quality Level |
|---|---|---|
| St37.0 (1.0254) | P235TR2 | TR2 |
| St44.0 (1.0256) | P265TR2 | TR2 |
| St52.0 (1.0421) | P355N | N (normalized) |
💡 For new projects, we strongly recommend specifying EN 10216-1 equivalents. This listing is for reference and legacy replacement purposes only.
Marking Requirements – DIN 1629
Per DIN 1629, each tube shall be marked with:
Manufacturer's identification mark
Steel grade (St37.0, St44.0, St52.0)
Material number (1.0254, 1.0256, 1.0421)
Heat number (for traceability)
Inspection stamp (for tested tubes)
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles or steel crates |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, DIN 1629 |
| Documentation | MTC + test reports |
| Lead time | 7-15 days (stock grades), 20-30 days (other) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our DIN 1629 Tubes?
| Advantage | Description |
|---|---|
| Legacy standard specialist | We supply DIN 1629 material for old project replacement |
| Full grade range | St37.0, St44.0, St52.0 – one-stop sourcing |
| EN equivalents available | Also supply current standards when needed |
| 100% hydrostatic tested | Per DIN 1629 requirement |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Stock availability | Common grades ready to ship |
| Global export | Shipped to legacy projects worldwide |
Contact for Quote – DIN 1629 Tubes
Please provide the following details:
Grade : St37.0 / St44.0 / St52.0
Quality suffix : .0 / .2 / .3 (if applicable)
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Application : Pressure vessel / Piping / Legacy replacement / Other _______
End Finish : Plain / Beveled / Threaded
Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Reply within 24 hours.
FAQ – DIN 1629 Tubes
Q1: Is DIN 1629 still valid?
A: No – DIN 1629 has been withdrawn and replaced by EN 10216-1. However, we continue to supply to this standard for legacy replacement projects.
Q2: What is the EN 10216-1 equivalent of St37.0?
A: P235TR2 – the direct replacement grade with equivalent mechanical properties.
Q3: What is the EN 10216-1 equivalent of St52.0?
A: P355N – normalized quality with similar strength (355 MPa min yield).
Q4: What is the maximum operating temperature for DIN 1629 tubes?
A: Generally limited to below 300°C (572°F). For higher temperatures, use EN 10216-2 (P235GH, etc.).
Q5: What does St52.0 mean?
A: St = Steel (Stahl in German), 52 = minimum yield strength in kgf/mm² (≈510 MPa), .0 = no impact test requirement.
Q6: What is the difference between St52.0 and St52.3?
A: St52.0 – no Charpy impact test required. St52.3 – Charpy impact tested at 0°C.
Q7: Does DIN 1629 require hydrostatic testing?
A: Yes – all tubes must undergo hydrostatic testing per standard requirements.
Q8: What are the surface quality requirements?
A: Inner and outer surfaces shall be smooth. Defects may be removed by grinding if wall thickness remains within tolerance. No weld repair is permitted.
Q9: Can you supply EN 10216-1 equivalents?
A: Yes – we also supply the current EN 10216-1 standard (P235TR2, P265TR2, P355N). Please specify which standard you require.
Q10: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Q11: Do you offer free samples?
A: 30cm sample available for common grades (St37.0, St52.0). Shipping fee applies.
Related Products – German vs European Standards
| Old German Standard | Current European Standard | Application |
|---|---|---|
| DIN 1629 | EN 10216-1 | Pressure purposes – room temperature |
| DIN 1630 | EN 10216-1 | Pressure purposes – higher quality |
| DIN 17175 | EN 10216-2 | Elevated temperature properties |
| DIN 2391 | EN 10305-1 | Precision tubes / hydraulics |
| DIN 1626 | EN 10217-1 | Welded pressure tubes |
Tags: DIN 1629 Seamless Steel Tube St37.0 St44.0 St52.0 German Standard Legacy Replacement Pressure Tube
Quick Reference – DIN 1629 Grade Selection
| Grade | EN Equivalent | Tensile (MPa) | Yield (MPa) | Best Application |
|---|---|---|---|---|
| St37.0 | P235TR2 | 350-480 | ≥235 | General pressure – most common |
| St44.0 | P265TR2 | 420-550 | ≥275 | Higher strength applications |
| St52.0 | P355N | 500-650 | ≥355 | High strength, heavy duty |
Grade Comparison Table
| Feature | St37.0 | St44.0 | St52.0 |
|---|---|---|---|
| Material No. | 1.0254 | 1.0256 | 1.0421 |
| EN Equivalent | P235TR2 | P265TR2 | P355N |
| C max % | 0.17 | 0.21 | 0.22 |
| Tensile (MPa) | 350-480 | 420-550 | 500-650 |
| Yield (MPa) | ≥235 | ≥275 | ≥355 |
| Elongation % | 25 (Longitudinal) | 21 (Longitudinal) | 21 (Longitudinal) |
DIN 1629 Size Range Summary
| Parameter | Range |
|---|---|
| Minimum OD | 10 mm (cold drawn) |
| Maximum OD | 610 mm (hot rolled) |
| Minimum WT | 1.5 mm (cold drawn) |
| Maximum WT | 50+ mm (hot rolled) |
| Standard length | 4-7.5 m (commercial) |
| Extended length | Up to 12 m (manufacturing, by agreement) |
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