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DIN 2391 ST52 Honed Seamless Steel Tube | E355 Hydraulic Cylinder Tubing
Xi'an Dongmeng Group Co., Ltd. supplies DIN 2391 ST52 honed seamless steel tubes for hydraulic cylinder manufacturers, industrial equipment producers, machining companies and international steel distributors. Manufactured from precision cold-drawn seamless steel tubing, these products feature accurately finished internal bores designed for hydraulic cylinder barrels and other applications requiring controlled bore geometry and surface quality.
Our ST52 / E355 hydraulic cylinder tubes can be specified with H8 or H9 internal diameter tolerances, honed or skived and roller burnished (SRB) surfaces, and customized cutting lengths. Material grades, delivery conditions, dimensional tolerances and inspection requirements are confirmed according to customer drawings and purchase specifications.
For OEM manufacturing and replacement cylinder projects, we support technical quotation based on bore diameter, outside diameter, wall thickness, operating conditions and the required inspection documentation.
What Is DIN 2391 ST52 Honed Seamless Steel Tube?
DIN 2391 ST52 honed seamless steel tube is a precision mechanical steel tube produced from seamless carbon-manganese steel tubing and subsequently finished internally by honing or another specified bore-finishing process.
The historic DIN 2391 standard series addressed seamless precision steel tubes. DIN 2391-1 covered dimensions, while DIN 2391-2 specified technical delivery conditions. EN 10305-1 is the corresponding modern European standard for seamless cold-drawn precision steel tubes.
The commonly specified modern material is E355, material number 1.0580.
Honing is an additional finishing operation rather than an automatic requirement of the base precision-tube standard. The purchase order must therefore state the finished bore diameter, tolerance class, surface roughness and any additional cylinder-specific requirements.
Why Are ST52 Honed Tubes Used in Hydraulic Cylinders?
Hydraulic cylinder barrels require accurate internal dimensions, suitable wall strength and a surface finish compatible with their piston seals.
A correctly manufactured honed tube provides:
Controlled internal diameter for piston and sealing-system fit.
Consistent bore geometry for precision cylinder assembly.
A specified internal surface texture for sliding seals.
Seamless steel construction without a longitudinal weld seam.
Good machining characteristics for cylinder-end preparation.
Dimensional flexibility for hydraulic equipment manufacturers.
The finished cylinder's pressure capacity depends on wall thickness, material condition, end connections, fatigue loading and overall hydraulic design. It should not be determined from the steel grade alone.
DIN 2391 ST52 Honed Tube Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Seamless Precision Honed Steel Tube |
| Material | ST52 / E355 |
| Material Number | 1.0580 |
| Historical Standard | DIN 2391-1 / DIN 2391-2 |
| Modern Reference Standard | EN 10305-1 |
| Base Tube | Cold Drawn Seamless |
| Delivery Condition | +SR / +N |
| Internal Processing | Honing / SRB |
| Typical Inquiry Bore Range | 40–250 mm (1.57–9.84 in) |
| Outside Diameter | Determined by bore and wall thickness |
| Wall Thickness | According to cylinder design and available tube dimensions |
| Inner Diameter Tolerance | H8 / H9; other classes by agreement |
| Surface Roughness | Specified Ra limit, typically ≤0.4 μm for precision-finished bores |
| Length | Cut-to-length; lengths up to 6 m commonly quoted |
| Straightness | Defined in the purchase specification |
| Surface Protection | Temporary Rust-Preventive Oil |
| Documentation | EN 10204 Type 3.1, when specified |
| Customization | ID, OD, Length, Tolerance, Finish and Inspection |
Important: The dimension ranges above describe typical procurement requirements rather than guaranteed stock availability. Final manufacturing feasibility depends on the required combination of bore size, outside diameter, wall thickness, processing route and production quantity.
ST52 Honed Tube Size Chart – ID, OD and Wall Thickness
Honed cylinder tubes are normally ordered by finished inside diameter × outside diameter × length.
The nominal wall thickness is calculated as:
Wall Thickness = (Outside Diameter − Inside Diameter) / 2
Common Hydraulic Cylinder Tube Size Examples
| Finished ID (mm) | OD (mm) | Nominal Wall (mm) | Approx. Weight (kg/m) |
|---|---|---|---|
| 40 | 50 | 5 | 5.55 |
| 50 | 60 | 5 | 6.78 |
| 63 | 75 | 6 | 10.21 |
| 80 | 95 | 7.5 | 16.18 |
| 100 | 120 | 10 | 27.13 |
| 125 | 145 | 10 | 33.29 |
| 160 | 190 | 15 | 64.73 |
| 200 | 230 | 15 | 79.53 |
These are illustrative ID/OD configurations for specification and quotation discussions, not a confirmed inventory list.
Theoretical weights are calculated using a nominal steel density of 7.85 g/cm³. Actual weights vary with manufacturing tolerances.
For each order, customers should specify:
Finished inside diameter and tolerance class.
Outside diameter and applicable dimensional tolerance.
Minimum required wall thickness, where critical.
Fixed or random length requirements.
Internal surface roughness and finishing method.
Straightness, roundness and other geometric requirements.
ST52 Honed Tube H8 and H9 Bore Tolerances
The internal diameter tolerance directly influences the dimensional fit between a hydraulic cylinder barrel, piston assembly and sealing components.
ISO H8 and H9 tolerance classes are commonly used when specifying precision cylinder tubes.
ISO H8 / H9 Internal Diameter Tolerance Chart
| Nominal Bore (mm) | H8 Tolerance (mm) | H9 Tolerance (mm) |
|---|---|---|
| 40 | 0 / +0.039 | 0 / +0.062 |
| 50 | 0 / +0.039 | 0 / +0.062 |
| 63 | 0 / +0.046 | 0 / +0.074 |
| 80 | 0 / +0.046 | 0 / +0.074 |
| 100 | 0 / +0.054 | 0 / +0.087 |
| 125 | 0 / +0.063 | 0 / +0.100 |
| 160 | 0 / +0.063 | 0 / +0.100 |
| 200 | 0 / +0.072 | 0 / +0.115 |
The values follow the ISO 286 hole-basis tolerance system.
For example:
100 mm H8 Bore
Permitted internal diameter: 100.000–100.054 mm.
100 mm H9 Bore
Permitted internal diameter: 100.000–100.087 mm.
H8 provides a narrower permissible diameter range than H9. However, selecting H8 does not automatically guarantee better cylinder performance. Bore geometry, piston dimensions, seal design, lubrication and operating conditions must also be considered.
For demanding applications, additional requirements may include roundness, cylindricity, bore straightness and surface profile parameters.
Honed vs Skived and Roller Burnished Cylinder Tubes
The internal finishing method plays an important role in determining the final bore texture, dimensional accuracy and manufacturing efficiency.
Precision Honing
Honing uses abrasive tools to remove a controlled amount of material from the internal surface.
The process is suitable for achieving accurate bore dimensions and producing a controlled cross-hatch surface texture.
Typical applications include hydraulic cylinder barrels requiring carefully specified surface roughness and dimensional consistency.
Skiving and Roller Burnishing (SRB)
Skiving removes a controlled amount of internal material, while roller burnishing plastically smooths the surface through mechanical contact.
SRB is often selected for efficient production of hydraulic cylinder tubes with accurate internal dimensions and smooth bore surfaces.
Process Comparison
| Feature | Honing | Skiving & Roller Burnishing |
|---|---|---|
| Finishing Mechanism | Abrasive Material Removal | Cutting Followed by Plastic Smoothing |
| Internal Surface | Controlled Honed Texture | Smooth Burnished Texture |
| Bore Accuracy | High, Process-Dependent | High, Process-Dependent |
| Surface Roughness | Defined by Honing Specification | Defined by SRB Specification |
| Typical Use | Precision Cylinder Barrels | Production Cylinder Barrels |
| Important Selection Factor | Bore Geometry and Surface Texture | Production Efficiency and Surface Requirements |
A typical procurement target is Ra ≤0.4 μm, although tighter or different limits may be specified according to the seal manufacturer's recommendations and production capability.
For critical sealing applications, the customer may also specify Rz, material ratio, surface direction and other relevant profile characteristics.
ST52 / E355 Chemical Composition
The E355 steel grade used for precision seamless tubes is a carbon-manganese steel identified by European material number 1.0580.
EN 10305-1 E355 Chemical Composition
| Element | Symbol | Composition (% by Mass) |
|---|---|---|
| Carbon | C | ≤0.22 |
| Silicon | Si | ≤0.55 |
| Manganese | Mn | ≤1.60 |
| Phosphorus | P | ≤0.025 |
| Sulfur | S | ≤0.025 |
The applicable standard may also specify steelmaking and deoxidation requirements.
Actual heat-analysis results should be verified against the material test certificate and the agreed product specification.
Mechanical Properties of ST52 / E355 Precision Tubes
Mechanical properties depend on the material grade, dimensions and final delivery condition.
It is important to distinguish between stress-relieved and normalized tubes because the specified minimum strength and elongation values are different.
E355 Mechanical Properties by Delivery Condition
| Property | E355 +SR | E355 +N |
|---|---|---|
| Historical Delivery Designation | BKS | NBK |
| Delivery Condition | Stress Relieved | Normalized |
| Tensile Strength Rm | ≥580 MPa | 490–630 MPa |
| Yield Strength | ≥450 MPa | ≥355 MPa |
| Longitudinal Elongation | ≥10% | ≥22% |
Values are reference minimums or specified ranges associated with EN 10305-1 E355 delivery conditions and may be subject to applicable dimensional qualifications.
E355+SR: Commonly considered when higher specified yield strength is important for hydraulic cylinder manufacturing.
E355+N: Offers a normalized material condition with higher specified minimum elongation and may be preferred when greater ductility is required for subsequent fabrication.
Customers should select the delivery condition according to design requirements, machining operations and the properties stated on the MTC.
Typical Physical Properties
| Property | Approximate Value |
|---|---|
| Density | 7.85 g/cm³ |
| Elastic Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Thermal Conductivity | Approximately 45–55 W/(m·K) |
| Thermal Expansion Coefficient | Approximately 12 × 10⁻⁶/K |
These are indicative room-temperature engineering values for carbon-manganese steel, not guaranteed acceptance properties under EN 10305-1.
DIN 2391 ST52 and EN 10305-1 E355 Grade Comparison
ST52 and E355 are frequently used together in hydraulic cylinder tube procurement, but grade references must be interpreted with the correct product standard.
| Designation | Reference Standard | Notes |
|---|---|---|
| St52 | DIN 2391-2 | Historical precision seamless tube grade |
| E355 (1.0580) | EN 10305-1 | Modern precision seamless tube grade |
| St52-3 | Historical DIN structural material designation | Not automatically interchangeable without specification review |
| S355 Structural Grades | EN 10025 Series | Structural steel specification; not a direct substitute for precision cylinder tubing |
| ASTM A519 1026 | ASTM A519/A519M | Alternative mechanical tubing grade requiring separate technical evaluation |
Are ST52 and E355 the Same Material?
ST52 and E355 are commonly associated in precision steel tube specifications, particularly when material number 1.0580 is referenced.
However, a reliable material comparison should verify:
The applicable manufacturing standard.
The exact steel grade and material number.
The delivery and heat-treatment condition.
Mechanical properties and chemical composition.
Finished dimensional and surface requirements.
An alternative grade should not be approved based on its commercial name alone.
Manufacturing Process
DIN 2391 ST52 honed seamless steel tubes typically begin with precision seamless tube production followed by controlled finishing operations.
1. Seamless Tube Production
Seamless steel tubes are produced using appropriate tube manufacturing methods and prepared for precision cold drawing.
2. Cold Drawing
Cold drawing improves dimensional control and prepares the tube for subsequent machining and internal finishing.
3. Heat Treatment
The tube is supplied in the agreed delivery condition, such as stress relieved (+SR) or normalized (+N).
4. Straightening and Dimensional Inspection
The outside diameter, wall thickness, straightness and general tube geometry are checked against the production requirements.
5. Internal Honing or SRB
The internal bore is finished to the specified dimensional tolerance and surface requirements.
6. Final Cleaning and Inspection
Residual cutting fluid, abrasive particles and metal debris are removed. Bore dimensions, surface roughness and other agreed characteristics are verified.
7. Corrosion Protection and Packaging
The finished tubes are protected against contamination, handling damage and corrosion during storage and transportation.
Machining, Welding and Fabrication Considerations
Machining
ST52 / E355 seamless steel tubing is suitable for machining operations used in hydraulic cylinder fabrication, including cutting, turning, boring and preparation for welded or mechanically connected end components.
The selected cutting parameters should consider the actual material condition and required dimensional accuracy.
Welding
E355 tubing may be welded using a qualified procedure appropriate to the material condition, wall thickness, joint design and service conditions.
Welding can introduce distortion, residual stresses and changes in the heat-affected zone. For hydraulic cylinder barrels, welding near a finished bore may require additional dimensional verification.
Corrosion Protection
ST52 / E355 is carbon-manganese steel and does not offer the inherent corrosion resistance of stainless steel.
Temporary rust-preventive oil is commonly used for storage and transportation. External painting, plating or other protective treatments may be specified for the completed hydraulic cylinder assembly.
Protective treatments applied to the internal bore must be compatible with the hydraulic fluid, piston seals and required surface finish.
ST52 Honed Tube Applications
Hydraulic Cylinder Manufacturing
Used as precision cylinder barrels in hydraulic systems requiring controlled internal dimensions and appropriate material strength.
Construction and Earthmoving Equipment
Suitable for cylinder manufacturing in excavators, loaders, cranes and other mobile hydraulic machinery.
Agricultural Machinery
Applied to hydraulic cylinders used in tractors, harvesters and agricultural equipment.
Industrial Hydraulic Equipment
Used in cylinder assemblies for hydraulic presses, manufacturing equipment and industrial machinery.
Material Handling and Lifting Systems
Suitable for hydraulic cylinders used in forklifts, lifting platforms and other material-handling equipment.
Mining and Heavy Equipment
Used in cylinder applications where suitable material strength, dimensional accuracy and verification of service conditions are required.
Inspection & Quality Assurance
Quality verification for precision honed tubes should cover both the base material and the finished internal bore.
Material Verification
Chemical composition review.
Tensile and yield strength verification.
Elongation testing where required.
Material identification and heat traceability.
Dimensional Inspection
Finished internal diameter.
Outside diameter.
Wall thickness.
Bore tolerance verification.
Straightness.
Roundness and other geometric requirements when specified.
Finished length and end condition.
Surface Inspection
Internal surface roughness measurement.
Visual inspection of the bore.
Inspection for scratches, dents, scoring and other unacceptable defects.
Surface cleanliness verification.
Non-Destructive Testing
Ultrasonic testing, eddy current testing or other suitable methods may be specified according to the applicable standard, inspection category and purchase order.
Hydrostatic or pressure testing is not automatically included with every precision honed tube and should be explicitly requested when necessary.
Material Test Certificates
When required, an EN 10204 Type 3.1 Material Test Certificate can be specified to document the applicable material test results and product traceability.
Third-party inspection arrangements may be included according to project requirements.
Packaging and International Delivery
Proper packaging is important because the finished internal bore can be damaged by corrosion, contamination or improper handling.
Available packaging arrangements may include:
Temporary rust-preventive oil.
Protective plastic end caps.
Waterproof wrapping.
Secured steel tube bundles.
Wooden crates or reinforced export packaging.
Customized packaging for precision-cut lengths.
Product identification should include the relevant grade, dimensions, batch or heat reference and delivery condition as required by the purchase order.
MOQ: Depends on size, finish, quantity and processing requirements.
Lead Time: Confirmed after technical specification and production availability review.
Delivery: International export shipment with the agreed inspection and shipping documentation.
Why Choose Xi'an Dongmeng Group Co., Ltd.?
Technical Specification Support
We help buyers define the correct grade, delivery condition, bore tolerance and internal surface finishing requirements before production.
Precision Tube Supply
Our product range covers seamless precision tubes and hydraulic cylinder tubing for OEM manufacturers and industrial customers.
Customized Processing
Customers can request specific tube dimensions, cutting lengths, internal finishing methods and inspection requirements.
Material Traceability
Material identification and inspection documentation can be incorporated into the purchase specification.
Export-Oriented Service
We support international inquiries involving technical drawings, manufacturing requirements, packaging arrangements and shipment documentation.
Frequently Asked Questions
1. What is DIN 2391 ST52 honed seamless steel tube?
It is a precision seamless steel tube manufactured from ST52/E355-type material and finished internally to a specified bore tolerance and surface roughness. It is commonly used for hydraulic cylinder barrels.
2. What is the difference between ST52 and E355?
St52 is a historical DIN designation, while E355 (1.0580) is the corresponding modern designation used for EN 10305-1 precision tubes. The applicable standards, delivery conditions and material certificates should be checked before substitution.
3. Is DIN 2391 still a current standard?
DIN 2391-1 and DIN 2391-2 are withdrawn historical standards. EN 10305-1 is the modern European reference for seamless cold-drawn precision steel tubing.
4. What is the difference between H8 and H9 honed tubing?
H8 provides a narrower bore diameter tolerance than H9 for the same nominal diameter. The correct selection depends on the piston assembly, seal design and cylinder manufacturing requirements.
5. What internal surface roughness is available?
A commonly specified target is Ra ≤0.4 μm. Different roughness requirements may be discussed based on the bore size, finishing method and cylinder seal specification.
6. Can you provide skived and roller burnished tubes?
Honing and SRB are available as separate finishing options, subject to the required size and production arrangement. The preferred process should be specified during technical quotation.
7. What dimensions should I provide when ordering?
Provide the finished inside diameter, outside diameter, length, bore tolerance, surface roughness, material grade, delivery condition and required quantity.
8. Is E355+SR stronger than E355+N?
Under the referenced EN 10305-1 conditions, E355+SR has a higher specified minimum yield strength, while E355+N has a higher specified minimum elongation. The appropriate condition depends on the application.
9. Can ST52 honed tubes be used for high-pressure hydraulic cylinders?
They can be considered for hydraulic cylinder applications, but the permissible working pressure must be established through engineering design and verification of the complete assembly. Material grade alone does not determine the pressure rating.
10. Are ASTM A519 tubes equivalent to DIN 2391 ST52?
ASTM A519 specifies seamless mechanical tubing under a different standard system. Some ASTM grades may serve as alternatives, but they are not automatically equivalent to E355. Chemical composition, mechanical properties, manufacturing condition and dimensional specifications must be evaluated.
11. Can you provide EN 10204 3.1 material certificates?
EN 10204 Type 3.1 documentation can be included in the purchase requirements, subject to the selected material and supply arrangement.
12. How can I request a quotation for ST52 honed tubes?
Send your required ID × OD × Length, quantity, steel grade, delivery condition, bore tolerance and roughness specification. Technical drawings and additional inspection requirements are recommended for customized orders.
Contact Us – Request an ST52 Honed Tube Quotation
Xi'an Dongmeng Group Co., Ltd.
We supply DIN 2391 ST52 / EN 10305-1 E355 precision honed seamless steel tubes for hydraulic cylinder manufacturers, OEM equipment producers and industrial distributors.
For accurate technical and commercial evaluation, please provide:
Material: ST52 / E355
Standard: DIN 2391 / EN 10305-1
Delivery Condition: +SR / +N
Dimensions: ID × OD × Length
Bore Tolerance: H8 / H9 / Customized
Surface Finish: Honed / SRB
Surface Roughness: Required Ra Value
Quantity: Pieces / Meters / Tons
Documentation: MTC / NDT / Third-Party Inspection
Email: office@dongmjd.com
Phone / WhatsApp: +86 157 6921 4734
Office Address: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China.
Request a Technical Quotation | Submit Your Cylinder Drawing | Ask for an Available Size List
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