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EN 10305-1 E235 Honed Seamless Steel Tube
Xi'an Dongmeng Group Co., Ltd. supplies EN 10305-1 E235 honed seamless steel tube for hydraulic cylinder barrels, pneumatic cylinders and drawing-based mechanical components. The product combines seamless cold drawn tubing with an internally honed bore, with delivery condition, finished dimensions, surface texture and inspection requirements defined for each order.
Send your finished bore diameter, outside diameter or minimum wall thickness, length and drawing for a quotation covering the material specification and finished tube acceptance requirements.
Request a Quote | Send Your Drawing | Request a Sample MTC
What Is E235 Honed Seamless Steel Tube?
EN 10305-1 specifies technical delivery conditions for seamless cold drawn precision steel tubes. E235 identifies the material grade, while the delivery-condition suffix identifies its processing or heat-treatment condition.
Honing is an additional internal finishing operation. For cylinder manufacture, define the finished bore requirements together with the base tube specification.
EN 10305-1:2016 covers specified outside diameters up to 380 mm. This standard scope should be distinguished from the supplier's actual manufacturing and stock range, which must be confirmed for each dimensional combination.
Technical Specifications
| Item | Specification / ordering requirement |
|---|---|
| Product | E235 honed seamless steel tube |
| Material standard | EN 10305-1; edition specified in the order |
| Steel grade | E235 |
| Material number | 1.0308 |
| Base tube construction | Seamless cold drawn precision tubing |
| Internal finishing | Honing |
| Delivery condition | +C, +LC, +SR, +A or +N, subject to supply confirmation |
| Finished bore diameter | Nominal ID and acceptance limits according to drawing |
| Outside diameter | OD and tolerance according to order |
| Wall thickness | Nominal wall and minimum finished wall where required |
| Length | Specified cut length and tolerance |
| Bore tolerance | Drawing limits; H8 or H9 requests reviewed for the actual dimensions |
| Surface texture | Required Ra and additional profile parameters where specified |
| Geometric acceptance | Straightness, roundness, cylindricity and taper as required |
| End preparation | Plain ends or agreed cutting, chamfering and machining requirements |
| Inspection documents | Specified material certificate and inspection reports |
| Packing | Agreed corrosion protection, bore protection and export packing |
Dimension note: State whether dimensions apply to the supplied tube or to the final component after further machining. For finished-bore orders, identify the minimum wall remaining after honing and subsequent operations.
Send your drawing for dimensional and processing review.
E235 Chemical Composition
The following reference values apply to the standard cast-analysis basis.
| Element | Reference requirement, mass % |
|---|---|
| Carbon, C | ≤ 0.17 |
| Silicon, Si | ≤ 0.35 |
| Manganese, Mn | ≤ 1.20 |
| Phosphorus, P | ≤ 0.025 |
| Sulfur, S | ≤ 0.025 |
| Aluminium, Al total | ≥ 0.015* |
Reference: EN 10305-1:2016. Verify the ordered requirements against the applicable edition and material certificate. Product analysis has separate permissible-deviation provisions.
The aluminium minimum has a standard exception where sufficient other nitrogen-binding elements are used. Any alternative route or specified sulfur option should be identified in the material requirements and inspection documentation.
Delivery Conditions and Mechanical Properties
Specify the delivery condition when comparing quotations. E235 supplied in different conditions has different mechanical-property requirements.
Reference Properties at Room Temperature
| Condition | Description | Tensile strength Rm, MPa | Yield strength ReH, MPa | Elongation A, min % |
|---|---|---|---|---|
| +C | Cold drawn / hard | ≥ 480 | - | 6 |
| +LC | Cold drawn / soft | ≥ 420 | - | 10 |
| +SR | Cold drawn and stress relieved | ≥ 420 | ≥ 350 | 16 |
| +A | Soft annealed | ≥ 315 | - | 25 |
| +N | Normalized | 340–480 | ≥ 235* | 25 |
Notes: These are standard reference requirements, not individual shipment results. A dash indicates that this summary does not list a fixed numerical yield-strength minimum.
For +N tubes with OD ≤ 30 mm and wall thickness ≤ 3 mm, the standard footnote reduces the minimum ReH to 225 MPa. Apply the standard's test and specimen requirements. hublebas.co.uk
Selecting the Condition
Choose the condition against the component drawing and subsequent manufacturing operations:
Confirm strength and elongation requirements before selecting cold drawn material.
Specify stress relief when required by the approved manufacturing route.
Identify forming, welding or further heat treatment before ordering.
Confirm when final honing and dimensional inspection occur in the processing sequence.
The grade name alone does not establish the finished component's mechanical acceptance requirements.
Finished Bore Tolerance and Surface Texture
The bore specification should define diameter, geometry and surface texture separately.
| Requirement | Information to specify |
|---|---|
| Finished ID | Nominal diameter and upper/lower limits |
| Bore tolerance | Drawing limits or requested hole-tolerance class |
| Roundness | Acceptance limit where required |
| Cylindricity and taper | Drawing limits and measurement basis |
| Straightness | Local or full-length requirement |
| Surface roughness | Parameter, units and acceptance limits |
| Measurement settings | Direction, evaluation settings and inspection positions |
| Cleanliness | Requirements relevant to subsequent assembly |
H8 or H9 addresses a diameter tolerance requirement. It does not independently specify surface roughness, roundness or cylindricity.
Select the surface texture according to the cylinder drawing and seal-system requirements. Where necessary, specify Rz or other profile parameters in addition to Ra.
Surface specification: State the required parameter and limit clearly, together with the inspection method. The agreed honing finish should be confirmed for the actual bore diameter and tube length.
Honing and Alternative Bore Finishing
Honing uses abrasives to finish the bore and develop the specified dimensions and surface texture.
Skiving and roller burnishing, or SRB, combines cutting with roller finishing. It is a different process and should be approved separately where proposed as an alternative. sunnen.com
If the drawing requires a honed bore, identify that requirement explicitly in the RFQ and purchase order.
Applications and Material Selection
E235 honed seamless tube can be considered for:
Hydraulic cylinder barrels.
Pneumatic cylinder bodies.
Industrial actuator sleeves.
Replacement cylinder tubes manufactured to an approved drawing.
Machined tubular components with specified internal bores.
For hydraulic applications, select the material and delivery condition against the minimum finished wall, design pressure, pressure cycling, temperature, end connections and welding details.
An E235 designation does not provide a universal working-pressure rating.
E235 or E355?
In comparable normalized conditions, E355 has higher reference strength requirements than E235. Select the grade against the component design, required properties and fabrication route. Precision tubes
When reviewing an alternative, compare the complete specification:
Grade + delivery condition + finished dimensions + mechanical acceptance + bore requirements.
Machining, Welding and Further Processing
Provide drawings for ports, threads, grooves, welded ends or mounting features. Identify machining allowances and the required remaining wall thickness.
For welded assemblies, the procedure should account for material chemistry, tube condition, wall thickness, restraint and service requirements. Preheat and post-weld treatment decisions belong in the approved welding procedure.
Where coating or plating is required, specify the surface to be treated, preparation, coating thickness and final dimensional limits. Internal honing and external piston-rod finishing perform different functions.
Inspection and Traceability
Agree the inspection and reporting scope before placing the order.
| Inspection item | Scope to confirm | Record to request |
|---|---|---|
| Material identity | Grade, condition and heat/lot identification | Material certificate and corresponding marking |
| Chemical composition | Applicable analysis basis and limits | Actual reported composition |
| Mechanical properties | Tests required for the ordered condition and inspection type | Relevant test results |
| Dimensions | ID, OD, wall and length | Dimensional inspection report |
| Bore geometry | Specified roundness, taper and other limits | Applicable measurement results |
| Surface texture | Roughness/profile requirements and settings | Bore surface inspection report |
| Additional NDT | Method, extent and acceptance criteria | Method-specific report |
| Third-party inspection | Witness points and reporting scope | Agreed inspection records |
| Packing and dispatch | Protection, identification and quantities | Packing list and agreed photographs |
Specify whether an EN 10204 3.1 inspection certificate is required, together with any separate dimensional, roughness or supplementary test reports.
Request a sample document when assessing the proposed reporting scope. Additional testing and third-party inspection requirements should appear in the quotation and purchase order.
Packing and Bore Protection
Define packing according to tube length, handling method, shipping route and expected storage period.
Requirements may include protective end caps, corrosion protection, separated bundles or crates, and clear heat/lot identification.
State any cleanliness or preservative-removal requirements so the protection method suits the customer's cleaning and assembly process.
Frequently Asked Questions
1. What is E235 honed seamless steel tube?
It is E235 seamless cold drawn precision tubing with an additional internal honing operation. The order should specify both the material requirements and the finished bore acceptance criteria.
2. Which delivery condition should I specify?
Choose the condition required by the component drawing and manufacturing route. Review strength, elongation, subsequent machining, forming and welding requirements before selecting +C, +LC, +SR, +A or +N.
3. Does EN 10305-1 automatically require an H8 or H9 honed bore?
EN 10305-1 provides base-tube requirements. A specified honed bore and an H8 or H9 tolerance require an additional order requirement and confirmation for the actual dimensions.
4. What surface roughness should I request?
Use the cylinder drawing and seal supplier's requirements. Specify Ra and any additional profile parameters, together with measurement settings and inspection locations.
5. Is E235 suitable for high-pressure cylinders?
Suitability depends on the complete cylinder design. Assess delivery condition, minimum finished wall, pressure cycling, temperature and end connections. The grade alone does not establish allowable pressure.
6. How does E235 compare with E355?
E355 has higher reference strength requirements in comparable normalized conditions. Select either grade against the required properties and fabrication route; substitution requires review of the complete specification.
7. Can E235 tubing be welded and machined?
Welding and machining can be considered for suitable component designs. Define the tube condition, processing allowances and applicable welding procedure, then verify final dimensions and acceptance requirements.
8. Can E235 replace DIN 2391 St35?
E235 is commonly referenced alongside St35 in precision-tube selection. Confirm the standard edition, condition, chemistry, dimensions and inspection requirements before approving substitution.
9. Which inspection documents and packing options should I request?
Specify the material certificate type, required test results, dimensional and bore reports, and any additional inspection. Packing should protect the bore and provide the identification required for receiving and traceability.
10. What information is needed for a quotation?
Provide grade, standard edition, delivery condition, finished ID and tolerance, OD or minimum wall, length, surface texture, quantity, inspection scope and destination. Attach the drawing and required delivery date.
Request an E235 Honed Tube Quote
Send your specification to Xi'an Dongmeng Group Co., Ltd.:
E235 + EN 10305-1 edition + delivery condition + finished ID/tolerance + OD/minimum finished wall + length + surface texture + quantity + inspection requirements + destination.
Attach the cylinder drawing and identify any approved material or finishing alternatives.
Suggested inquiry subject:
RFQ - EN 10305-1 E235 Honed Tube - [ID × OD × Length] - [Quantity]
Send Your Drawing and Request a Quote
Office Information
Company: Xi'an Dongmeng Group Co., Ltd.
Phone: +86 15769214734
Email: office@dongmjd.com
WhatsApp: +86 15769214734
Office Address: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China.
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