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Help CenterDIN 2391 Seamless Precision Steel Tubes For Cold Drawing or Cold Rolling – ST35, ST45, ST52
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DIN 2391 Seamless Precision Steel Tubes
For Cold Drawing or Cold Rolling – ST35, ST45, ST52
German Standard – Superseded by EN 10305-1 – Supplied for Legacy Projects
Product Overview
DIN 2391 is the German standard for seamless precision steel tubes manufactured by cold drawing or cold rolling processes. These tubes are characterized by tight dimensional tolerances, excellent surface finish, and consistent mechanical properties, making them ideal for hydraulic and pneumatic cylinders, precision mechanical components, and automotive parts.
The cold drawing/cold rolling process provides:
High dimensional accuracy – OD tolerances as tight as ±0.03-0.08mm
Excellent surface finish – No oxide layer, smooth internal and external surfaces
Increased mechanical strength – Cold working enhances material properties
Good formability – Can be bent, flared, and flattened without cracking
Steel Grades Covered:
ST35 (1.0305 / E235) – General precision engineering
ST45 (1.0408 / E255) – Higher strength applications
ST52 (1.0580 / E355) – High strength – most popular
Delivery Conditions:
BK (+C) – Cold drawn / as-drawn – maximum strength
BKW (+LC) – Cold drawn + light finishing – bright surface, for plating
BKS (+SR) – Stress relieved after cold drawing – dimensional stability
GBK (+A) – Annealed – soft, machinable
NBK (+N) – Normalized – good strength + ductility, weldable
⚠️ Important Note: DIN 2391 has been withdrawn and replaced by EN 10305-1. We supply to this withdrawn standard for legacy replacement, maintenance, and retrofit projects. For new projects, EN 10305-1 is recommended.
✅ DIN 2391 compliant – Supplied to withdrawn standard for legacy projects
✅ Cold drawn / cold rolled – Precision manufacturing process
✅ High dimensional accuracy – Tolerances as tight as ±0.03mm OD
✅ Excellent surface quality – No oxide layer, smooth ID/OD
✅ Multiple delivery conditions – BK, BKW, BKS, GBK, NBK
✅ Full range of sizes – 4mm – 120mm OD, 0.5mm – 20mm WT
✅ 100% eddy current testing available – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Stock available for ST52 NBK | Fast delivery
Key Specifications
| Parameter | Details |
|---|---|
| Standard | DIN 2391-1 / DIN 2391-2 (withdrawn – replaced by EN 10305-1) |
| Product Type | Seamless Precision Steel Tube – Cold Drawn or Cold Rolled |
| Steel Grades | ST35 (E235), ST45 (E255), ST52 (E355 – most popular) |
| Manufacturing Process | Cold drawn or cold rolled |
| OD Range | 4mm – 120mm (cold drawn); up to 200mm (cold drawn) |
| Wall Thickness | 0.5mm – 20mm |
| Length | 3m – 12m (fixed or random); standard 6m |
| Delivery Conditions | BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N) |
| Surface Finish | Black / Bright / Oiled / Phosphated |
| End Finish | Plain / Beveled / Threaded |
📌 Standard status: DIN 2391 has been superseded by EN 10305-1. We continue to supply to DIN 2391 for projects that still specify this legacy standard.
Steel Grade Overview
| Grade | Material No. | EN 10305 Equivalent | DIN Equivalent | Min Yield (MPa) | Tensile (MPa) | Delivery Condition | Typical Application |
|---|---|---|---|---|---|---|---|
| ST35 | 1.0305 | E235 | St 37.4 | 235 | 340-480 | BK, NBK | General precision engineering |
| ST45 | 1.0408 | E255 | St 45 | 255 | 410-550 | BK, NBK | Higher strength applications |
| ST52 | 1.0580 | E355 | St 52.4 | 355 | 490-640 | BK, NBK | Hydraulic cylinders, high strength |
💡 ST52 is the most commonly requested grade for hydraulic cylinder applications.
Mechanical Properties by Delivery Condition
ST35 (E235) – Mechanical Properties:
| Delivery Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) | Surface Condition |
|---|---|---|---|---|
| BK (+C) | 420-540 | ≥275 | ≥14 | As-drawn/dull |
| BKW (+LC) | 400-520 | ≥255 | ≥16 | Bright/smooth |
| BKS (+SR) | 380-500 | ≥235 | ≥18 | Dull |
| GBK (+A) | 340-480 | ≤295 | ≥25 | Dull/annealed |
| NBK (+N) | 340-480 | ≥235 | ≥25 | Dull/satin |
ST52 (E355) – Mechanical Properties:
| Delivery Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) | Surface Condition |
|---|---|---|---|---|
| BK (+C) | 560-780 | ≥450 | ≥10 | As-drawn/dull |
| BKW (+LC) | 520-700 | ≥420 | ≥12 | Bright/smooth |
| BKS (+SR) | 500-650 | ≥380 | ≥14 | Dull |
| GBK (+A) | 450-620 | ≤395 | ≥22 | Dull/annealed |
| NBK (+N) | 490-640 | ≥355 | ≥22 | Dull/satin |
💡 NBK (normalized) is the most popular delivery condition for hydraulic cylinders – excellent balance of strength and ductility.
Chemical Composition – DIN 2391 Grades
| Element | ST35 (1.0305) | ST45 (1.0408) | ST52 (1.0580) |
|---|---|---|---|
| Carbon (C) max | 0.17% | 0.21% | 0.22% |
| Silicon (Si) max | 0.35% | 0.35% | 0.55% |
| Manganese (Mn) max | 0.40% | 0.40% | 1.60% |
| Phosphorus (P) max | 0.025% | 0.025% | 0.025% |
| Sulfur (S) max | 0.025% | 0.025% | 0.025% |
💡 Low carbon content (≤0.22%) ensures excellent weldability and good formability for bending, flaring, and flattening operations.
Dimensional Tolerances – DIN 2391 Precision Tubes
OD Tolerances (Cold Drawn):
| OD Range (mm) | Standard Tolerance (mm) | High Precision (mm) |
|---|---|---|
| 4 – 30 | ±0.08 | ±0.03 |
| 31 – 40 | ±0.15 | ±0.05 |
| 41 – 50 | ±0.20 | ±0.08 |
| 51 – 60 | ±0.25 | ±0.08 |
| 61 – 80 | ±0.30 | ±0.10 |
| 81 – 120 | ±0.40 | ±0.15 |
Wall Thickness Tolerance:
Standard: ±10% (minimum ±0.12mm)
High precision: ±10% (minimum ±0.03-0.05mm)
Delivery Conditions – DIN 2391
| Symbol | DIN Symbol | EN Symbol | Description | Application |
|---|---|---|---|---|
| BK | +C | +C | Cold drawn / as-drawn – no heat treatment | Maximum strength |
| BKW | +LC | +LC | Cold drawn + light finishing – bright surface | For chrome plating prep |
| BKS | +SR | +SR | Stress relieved after cold drawing | Dimensional stability |
| GBK | +A | +A | Annealed – soft condition | For machining |
| NBK | +N | +N | Normalized – good strength + ductility | Most popular for hydraulics |
💡 BKW (finish drawn) provides a bright, smooth surface – ideal for chrome plating of piston rods. NBK (normalized) is recommended for hydraulic cylinder barrels requiring good weldability.
Applications – DIN 2391 Precision Tubes
| Industry | Application | Recommended Grade | Delivery Condition |
|---|---|---|---|
| Hydraulics | Cylinder barrels (standard) | ST52 | NBK |
| Hydraulics | Cylinder barrels (high pressure) | ST52 | BK |
| Hydraulics | Piston rods | ST52 | BKW (for chrome plate) |
| Pneumatics | Cylinder tubes | ST35 | NBK |
| Automotive | Shock absorber tubes | ST35 | BK, NBK |
| Automotive | Steering components | ST52 | BK, BKW |
| Machine building | Guide tubes, shafts | ST52 | BK, NBK |
| Bearing industry | Bearing sleeves | ST52 | BK, NBK |
| Precision machining | Machined components | ST35 | GBK (annealed) |
| Construction equipment | Excavator cylinders | ST52 | NBK, BK |
| Injection molding machines | Hydraulic components | ST52 | NBK |
| Die casting machines | Hydraulic cylinders | ST52 | NBK |
| Marine / Shipbuilding | Hydraulic systems | ST52 | NBK |
Available Sizes – DIN 2391 Precision Tubes (Metric)
| OD (mm) | Available WT (mm) | Typical Grade | Delivery Condition | Application |
|---|---|---|---|---|
| 6 | 1.0, 1.5, 2.0 | ST35, ST52 | BK, NBK | Small precision parts |
| 8 | 1.0, 1.5, 2.0 | ST35, ST52 | BK, NBK | Small precision parts |
| 10 | 1.0, 1.5, 2.0, 2.5 | ST35, ST52 | BK, NBK | Instrumentation |
| 12 | 1.5, 2.0, 2.5, 3.0 | ST35, ST52 | BK, NBK | Small cylinders |
| 14 | 1.5, 2.0, 2.5, 3.0 | ST35, ST52 | BK, NBK | Small cylinders |
| 15 | 1.5, 2.0, 2.5, 3.0 | ST52 | NBK | Pneumatic cylinders |
| 16 | 2.0, 2.5, 3.0, 3.5 | ST52 | NBK | Small hydraulic cylinders |
| 18 | 2.0, 2.5, 3.0, 3.5, 4.0 | ST52 | NBK | Small hydraulic cylinders |
| 20 | 2.0, 2.5, 3.0, 3.5, 4.0 | ST52 | NBK | Hydraulic cylinders |
| 22 | 2.5, 3.0, 3.5, 4.0, 5.0 | ST52 | NBK | Hydraulic cylinders |
| 25 | 2.5, 3.0, 3.5, 4.0, 5.0 | ST52 | NBK | Hydraulic cylinders |
| 28 | 2.5, 3.0, 3.5, 4.0, 5.0, 6.0 | ST52 | NBK | Hydraulic cylinders |
| 30 | 3.0, 3.5, 4.0, 5.0, 6.0 | ST52 | NBK | Hydraulic cylinders |
| 32 | 3.0, 3.5, 4.0, 5.0, 6.0 | ST52 | NBK | Hydraulic cylinders |
| 35 | 3.5, 4.0, 5.0, 6.0, 7.0 | ST52 | NBK | Hydraulic cylinders |
| 38 | 3.5, 4.0, 5.0, 6.0, 7.0, 8.0 | ST52 | NBK | Hydraulic cylinders |
| 40 | 4.0, 5.0, 6.0, 7.0, 8.0 | ST52 | NBK | Hydraulic cylinders |
| 42 | 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 | ST52 | NBK | Hydraulic cylinders |
| 45 | 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 | ST52 | NBK | Hydraulic cylinders |
| 48 | 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 | ST52 | NBK | Hydraulic cylinders |
| 50 | 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 | ST52 | NBK | Hydraulic cylinders – most common |
| 51 | 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 | ST52 | NBK | Hydraulic cylinders |
| 55 | 6.0, 7.0, 8.0, 9.0, 10.0, 11.0 | ST52 | NBK | Hydraulic cylinders |
| 60 | 6.0, 7.0, 8.0, 9.0, 10.0, 12.0 | ST52 | NBK | Hydraulic cylinders |
| 63 | 6.0, 7.0, 8.0, 9.0, 10.0, 12.0 | ST52 | NBK | Hydraulic cylinders |
| 65 | 7.0, 8.0, 9.0, 10.0, 12.0, 14.0 | ST52 | NBK | Heavy duty cylinders |
| 70 | 7.0, 8.0, 9.0, 10.0, 12.0, 14.0 | ST52 | NBK | Heavy duty cylinders |
| 75 | 8.0, 9.0, 10.0, 12.0, 14.0, 15.0 | ST52 | NBK | Heavy duty cylinders |
| 80 | 8.0, 9.0, 10.0, 12.0, 14.0, 16.0 | ST52 | NBK | Heavy duty cylinders |
| 85 | 10.0, 12.0, 14.0, 16.0, 18.0 | ST52 | NBK | Heavy duty cylinders |
| 90 | 10.0, 12.0, 14.0, 16.0, 18.0 | ST52 | NBK | Heavy duty cylinders |
| 95 | 10.0, 12.0, 14.0, 16.0, 18.0, 20.0 | ST52 | NBK | Heavy duty cylinders |
| 100 | 10.0, 12.0, 14.0, 16.0, 18.0, 20.0 | ST52 | NBK | Heavy duty cylinders |
| 105 | 12.0, 14.0, 16.0, 18.0, 20.0 | ST52 | NBK | Special application |
| 110 | 12.0, 14.0, 16.0, 18.0, 20.0 | ST52 | NBK | Special application |
| 120 | 12.0, 14.0, 16.0, 18.0, 20.0 | ST52 | NBK | Special application |
💡 Most popular sizes: 40-60mm OD for hydraulic cylinder barrels – ST52 NBK.
Grade Selection Guide – DIN 2391 Applications
| Application | Recommended Grade | Delivery Condition | Yield (MPa) | Key Feature |
|---|---|---|---|---|
| General precision parts | ST35 | NBK | ≥235 | Good balance |
| Higher strength parts | ST45 | NBK | ≥275 | Increased strength |
| Hydraulic cylinders (standard) | ST52 | NBK | ≥355 | Most popular |
| High strength hydraulics | ST52 | BK | ≥450 | Maximum strength |
| Chrome plated piston rods | ST52 | BKW | ≥420 | Bright surface |
| Machined components | ST35 | GBK | ≤295 | Soft, machinable |
| Welded assemblies | ST52 | NBK | ≥355 | Good weldability |
Key Advantages – DIN 2391 Precision Tubes
| Feature | Benefit |
|---|---|
| Cold drawn / cold rolled process | High dimensional accuracy – OD tolerances ±0.03-0.08mm |
| Excellent surface finish | Inner and outer walls – no oxide layer, smooth |
| No oxide layer | No scale – ready for immediate use, no pre-cleaning required |
| Good formability | Can be bent, flared, expanded, and flattened without cracking |
| High pressure capability | Withstands high pressure without leakage |
| Multiple delivery conditions | BK, BKW, BKS, GBK, NBK – match to application |
| Wide size range | 4mm – 120mm OD, 0.5mm – 20mm WT |
| Full traceability | EN 10204 3.1 MTC with heat number |
| ST52 most popular | High strength (355 MPa yield) – industry standard for hydraulics |
Quality Testing & Inspection – DIN 2391
| Test | Method | Coverage | Applicable Standards |
|---|---|---|---|
| Eddy Current (ET) | Non-destructive | 100% (available) | DIN 2391 / EN 10305 |
| Tensile Test | EN ISO 6892-1 | Per lot | All grades |
| Hardness Test | Rockwell/Brinell | Per lot | All grades |
| Flattening Test | Ductility | Per lot | DIN 2391 |
| Flaring Test | Expansion | Per lot | DIN 2391 |
| Dimensional Inspection | Micrometer | 100% | DIN 2391 |
| Visual Examination | Direct | 100% | DIN 2391 |
| Surface Roughness | Profilometer | Sample | As required |
💡 Eddy current testing is recommended for critical hydraulic applications to guarantee tube integrity.
Surface Finish Options
| Finish | Description | Application |
|---|---|---|
| As-drawn (BK) | Dull, slightly rough surface | General use, will be machined |
| Bright (BKW) | Smooth, bright finish | Chrome plating prep, aesthetic parts |
| Phosphated | Black phosphate coating | Corrosion protection, ready for installation |
| Oiled | Light oil coating | Temporary corrosion protection |
| Honed / Skived | Internal surface finished to Ra≤0.3μm | Hydraulic cylinder barrels |
💡 Phosphated tubes (black phosphate coating) are ready for immediate installation – no additional cleaning or rust prevention needed.
Processing Services
| Service | Description | Maximum Capability |
|---|---|---|
| Precision Cutting | Cut to exact length (±0.5mm) | Up to 12m |
| Honing (internal) | Surface finish Ra ≤0.2μm | Up to 100mm bore |
| Skiving + Roller Burnishing | Surface finish Ra ≤0.3μm | Up to 100mm bore |
| Chrome Plating (external) | For piston rods | Up to 100mm OD |
| Turned / Ground | Precision OD machining | Up to 120mm |
| Heat Treatment | Annealing, normalizing, stress relieving | All sizes |
| Phosphating | Black phosphate coating | All sizes |
| Bending | Cold bending | Various |
DIN 2391 vs EN 10305-1 – Standard Comparison
| Feature | DIN 2391 (Withdrawn) | EN 10305-1 (Current) |
|---|---|---|
| Status | Withdrawn (superseded 2003) | Current |
| Steel grade naming | ST35, ST45, ST52 | E235, E255, E355 |
| Material numbers | 1.0305, 1.0408, 1.0580 | Same |
| Technical content | Equivalent | Equivalent |
| Delivery conditions | BK, BKW, BKS, GBK, NBK | +C, +LC, +SR, +A, +N |
| Best for | Legacy projects, existing specifications | New projects |
💡 For new projects, we recommend EN 10305-1. DIN 2391 is supplied for legacy replacement projects only.
Mill Test Certificate
EN 10204 Type 3.1 MTC – Provided with heat number
EN 10204 Type 3.2 – Available upon request (third-party inspection)
Traceability: Full traceability from melt to finished tube
Mechanical test reports: Tensile, hardness, flattening/flaring (as applicable)
Dimensional inspection report – OD, WT, length, straightness
NDT report – Eddy current testing (if specified)
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles with steel strapping |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, DIN 2391 |
| Documentation | MTC + test reports |
| Lead time | 7-15 days (stock: ST52 NBK), 20-30 days (other grades/conditions) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our DIN 2391 Precision Tubes?
| Advantage | Description |
|---|---|
| Cold drawing/precision specialist | Dedicated cold drawn tube line for precision applications |
| Full grade range | ST35, ST45, ST52 – one-stop sourcing |
| ST52 NBK in stock | Most popular hydraulic cylinder grade – ready to ship |
| Multiple delivery conditions | BK, BKW, BKS, GBK, NBK – all available |
| High precision tolerances | OD tolerances as tight as ±0.03mm available |
| Processing available | Cutting, honing, skiving, phosphating, bending |
| Legacy standard support | Supply to withdrawn DIN 2391 for replacement projects |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Global export | Shipped to hydraulic cylinder and machinery manufacturers worldwide |
Contact for Quote – DIN 2391 Precision Tubes
Please provide the following details:
Grade : ST35 / ST45 / ST52
Delivery Condition : BK / BKW / BKS / GBK / NBK
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Application : Hydraulic cylinder / Pneumatic cylinder / Mechanical part / Other _______
Surface finish : As-drawn / Bright / Phosphated / Honed
Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Reply within 24 hours.
FAQ – DIN 2391 Precision Tubes
Q1: Is DIN 2391 still valid?
A: No – DIN 2391 has been withdrawn and replaced by EN 10305-1. However, we continue to supply to this standard for legacy replacement, maintenance, and retrofit projects.
Q2: What is the EN 10305-1 equivalent of ST52?
A: E355 – the direct replacement grade with equivalent mechanical properties and chemical composition.
Q3: What does BK, BKW, NBK mean?
A: BK – as-drawn (highest strength). BKW – finish drawn (bright surface). BKS – stress relieved. GBK – annealed (soft). NBK – normalized (good strength + ductility).
Q4: What is the most popular grade for hydraulic cylinders?
A: ST52 NBK – normalized condition with yield ≥355 MPa, tensile 490-640 MPa. Excellent balance of strength, ductility, and weldability.
Q5: What are the key characteristics of DIN 2391 tubes?
A: High dimensional accuracy (±0.03-0.08mm OD), excellent surface finish (no oxide layer), good formability (bending, flaring, flattening without cracking), and high pressure capability.
Q6: What is the difference between BK and NBK?
A: BK – cold drawn / as-drawn – highest strength, lower ductility, not recommended for welding. NBK – normalized – lower strength but better ductility, excellent weldability.
Q7: What surface finish is best for chrome plated piston rods?
A: BKW (finish drawn) provides a bright, smooth surface ideal for chrome plating prep.
Q8: What is the typical OD tolerance for DIN 2391 tubes?
A: Up to 4-30mm OD: ±0.08mm standard, ±0.03mm high precision.
Q9: Can DIN 2391 tubes be bent, flared, or flattened?
A: Yes – DIN 2391 tubes are designed for good formability. They can be bent, flared, expanded, and flattened without cracking.
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 (ST52 NBK). Shipping fee applies.
Related Products – Precision Tubes
DIN 2391 – Seamless precision steel tubes (this product – legacy standard)
EN 10305-1 – Current European standard (E235, E355)
EN 10305-4 – Precision tubes for hydraulic/pneumatic systems
EN 10297-1 – Mechanical engineering tubes
DIN 2445 – Seamless steel tubes for hydraulic cylinders (another German standard)
ASTM A519 – Mechanical tubing (US equivalent)
Tags: DIN 2391 Precision Steel Tube Seamless Tube Cold Drawn ST35 ST45 ST52 Hydraulic Cylinder Tube German Standard Legacy Replacement
Quick Reference – DIN 2391 Grade Selection
| Grade | EN Equivalent | Tensile (MPa) | Yield (MPa) | Delivery Condition | Best Application |
|---|---|---|---|---|---|
| ST35 | E235 | 340-480 | ≥235 | NBK | General precision parts |
| ST45 | E255 | 410-550 | ≥275 | NBK | Higher strength precision |
| ST52 | E355 | 490-640 | ≥355 | NBK | Hydraulic cylinders – most popular |
Delivery Condition Summary
| Symbol | DIN Symbol | EN Symbol | Description | Strength | Ductility | Surface | Weldability |
|---|---|---|---|---|---|---|---|
| BK | +C | +C | As-drawn | Highest | Lowest | Dull | Poor |
| BKW | +LC | +LC | Finish drawn | High | Medium | Bright | Medium |
| BKS | +SR | +SR | Stress relieved | Medium | Medium | Dull | Medium |
| GBK | +A | +A | Annealed | Lowest | Highest | Dull | Excellent |
| NBK | +N | +N | Normalized | Medium | High | Dull/satin | Excellent |
DIN 2391 Size Range Summary
| Parameter | Range |
|---|---|
| Minimum OD | 4 mm (cold drawn) |
| Maximum OD | 120 mm (cold drawn); up to 200mm |
| Minimum WT | 0.5 mm |
| Maximum WT | 20 mm |
| Standard length | 6 m (fixed) |
| Extended length | Up to 12 m |
Chemical Composition Comparison
| Element | ST35 (1.0305) | ST45 (1.0408) | ST52 (1.0580) |
|---|---|---|---|
| C max | 0.17% | 0.21% | 0.22% |
| Si max | 0.35% | 0.35% | 0.55% |
| Mn max | 0.40% | 0.40% | 1.60% |
| P max | 0.025% | 0.025% | 0.025% |
| S max | 0.025% | 0.025% | 0.025% |
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