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EN 10305-1 C45E Honed Seamless Steel Tube
Medium-Carbon Precision Tubing for OEM Components
Xi'an Dongmeng Group Co., Ltd. supplies C45E honed seamless steel tubes for precision sleeves, machined tubular components and cylinder barrels specified by customer drawings. Quotations are prepared against the required material condition, finished bore, minimum wall thickness, processing route and inspection documents.
C45E, material number 1.1191, is a medium-carbon non-alloy special steel included among the additional grades in Annex A of EN 10305-1:2016. Specify the grade together with its delivery condition and finished tube requirements.
Send your drawing, delivery condition and quantity for a C45E tube quotation.
What Matters When Buying C45E Honed Tubes
C45E combines a medium-carbon material with the dimensional control of a seamless precision tube. Internal honing provides the finished bore specified for the component.
For procurement, three requirements should be defined together:
Material condition: The strength and elongation required when the tube is delivered.
Further processing: Any machining, welding or heat treatment planned after delivery.
Final acceptance: The bore size, geometry, surface profile and remaining wall required at assembly.
For parts that will undergo heat treatment or welding, include these operations in the inquiry. Their position in the manufacturing sequence affects the final inspection requirements.
Product Specifications
| Item | Specification |
|---|---|
| Product | C45E honed seamless precision steel tube |
| Material designation | C45E / 1.1191 |
| Technical delivery specification | EN 10305-1:2016, with C45E requirements defined in the order |
| Manufacturing route | Seamless tube followed by cold drawing |
| Bore finishing | Internal honing to the approved specification |
| Delivery condition | +C, +LC, +A or +N; special requirements reviewed separately |
| Dimensions | Finished ID × OD or wall thickness × length |
| Bore tolerance | H8, H9 or drawing-specific limits, subject to technical review |
| Bore geometry | Roundness, cylindricity and straightness as required |
| Surface profile | Ra and additional parameters to the agreed drawing |
| End preparation | Cutting, deburring, chamfers or machining as quoted |
| Inspection documents | Requested material certificate and finished tube reports |
| Packing | Bore protection and supported packing as agreed |
Size availability and processing capability are confirmed for each specification. Identify whether dimensions apply to the incoming tube or the finished component.
C45E Chemical Composition
The following values are the cast analysis reference limits in EN 10305-1:2016, Table A.1.
| Element | Content, % by Mass |
|---|---|
| Carbon, C | 0.42–0.50 |
| Silicon, Si | ≤0.40 |
| Manganese, Mn | 0.50–0.80 |
| Phosphorus, P | ≤0.030 |
| Sulfur, S | ≤0.035 |
| Chromium, Cr | ≤0.40 |
| Molybdenum, Mo | ≤0.10 |
| Cr + Mo + Ni, total | ≤0.63 |
Product analysis is assessed using the applicable permitted deviations. Review certificate results against the ordered specification and analysis basis.
Mechanical Properties by Delivery Condition
Room-temperature reference values for C45E in EN 10305-1:2016, Table A.3:
| Delivery Condition | Tensile Strength Rm, MPa | Yield Strength ReH, MPa | Elongation A, % |
|---|---|---|---|
| +C - Cold drawn, hard | ≥720 | Not specified in Table A.3 | ≥4 |
| +LC - Cold drawn, soft | ≥670 | Not specified in Table A.3 | ≥6 |
| +SR - Stress relieved | Not specified in Table A.3 | Not specified in Table A.3 | Not specified in Table A.3 |
| +A - Annealed | ≥510 | Not specified in Table A.3 | ≥20 |
| +N - Normalized | ≥540 | ≥340 | ≥18 |
The +N row specifies a tensile strength minimum without an upper limit.
C45E +SR has no numerical property requirements in this table. If stress relief is required, agree the strength, elongation and testing requirements before ordering.
Selecting the Supplied Condition
| Requirement | Condition to Evaluate |
|---|---|
| Drawing specifies cold-worked properties with limited subsequent deformation | +C |
| A limited drawing pass after heat treatment is required | +LC |
| Annealed material is specified for further component processing | +A |
| Normalized tube properties are required | +N |
| Stress relief is required | A separately agreed C45E acceptance specification |
| Quenching and tempering are required | Final properties and processing scope agreed separately |
The higher tensile strength of cold-drawn conditions comes with lower specified elongation. Select the condition using both the component requirements and the subsequent manufacturing route.
Send Your Drawing for Specification Review
C45E vs. Other Honed Tube Materials
| Material | Selection Consideration |
|---|---|
| C45E | Evaluate when the drawing requires this medium-carbon grade and a defined processing route |
| C35E | Lower carbon content within the same material family; compare condition-specific properties |
| E355 | Compare the required yield strength, supplied condition and welding requirements |
| ASTM A519 Grade 1045 | Related medium-carbon mechanical tubing option requiring a separate specification comparison |
C45E and SAE 1045 are commonly associated in material comparison references. Substitution requires checking chemistry, product standard, condition, dimensions and certification requirements. ASTM A519 covers seamless mechanical tubing with its own requirements.
Plan Heat Treatment Around the Finished Bore
C45E can respond to quenching and tempering, but the resulting properties depend on the component section and treatment. Define the final property requirements explicitly. lucefin.com
For components requiring further heat treatment, the process plan should address:
The required final hardness or mechanical properties.
Machining and bore-finishing allowances.
Possible distortion and any straightening requirements.
The stage at which final honing takes place.
Inspection after the operations that can affect the bore.
State whether you require a finished honed tube for assembly or a tube blank for further processing. This distinction helps align the quotation with the actual work required.
Bore Tolerance and Surface Requirements
H8 and H9 Bore Examples
| Nominal Bore, mm | H8 Limits, mm | H9 Limits, mm |
|---|---|---|
| 50 | 50.000–50.039 | 50.000–50.062 |
| 63 | 63.000–63.046 | 63.000–63.074 |
| 100 | 100.000–100.054 | 100.000–100.087 |
| 125 | 125.000–125.063 | 125.000–125.100 |
These ISO tolerance references support drawing preparation. The required production tolerance is confirmed against tube diameter, wall, length and processing route. preview.sist.si
Bore size tolerance should be supplemented with geometric requirements where needed. Include roundness, cylindricity, bore straightness and inspection positions.
Specify the Surface for the Seal or Mating Component
For cylinder bores, provide the selected seal system and its surface recommendations. The inspection specification may include:
Ra and Rz.
Material ratio or other profile parameters.
Measurement direction, settings and evaluation length.
Requirements for scratches, chatter and surface defects.
The required honing pattern, where specified.
Surface texture influences lubrication and wear. Seal suppliers evaluate the mating surface using more than a single Ra value.
Illustrative Dimensions and Theoretical Weights
These calculated examples help buyers prepare RFQs. Availability is confirmed by quotation.
| Finished ID, mm | OD, mm | Nominal Wall, mm | Theoretical Weight, kg/m |
|---|---|---|---|
| 50 | 65 | 7.5 | 10.64 |
| 63 | 80 | 8.5 | 14.99 |
| 80 | 100 | 10.0 | 22.20 |
| 100 | 125 | 12.5 | 34.68 |
| 125 | 150 | 12.5 | 42.39 |
| 160 | 190 | 15.0 | 64.74 |
Calculation basis: steel density assumed at 7,850 kg/m³.
Weight, kg/m = π/4 × (OD² − ID²) × 0.00785, with diameters in millimetres.
Actual weight varies with tolerances. Specify minimum local wall thickness where required, accounting for finished dimensions and eccentricity.
Welding and Bore Finishing
Welding C45E
C45E requires attention to welding procedure selection because of its carbon content. Review the supplied condition, joint thickness, restraint, hydrogen control and required thermal treatment.
Submit details of welded ports, brackets or end fittings during quotation. The approved procedure should define heating requirements and inspection after welding. Welding can affect local material properties and component geometry. ovako.com
Honing and Skiving with Roller Burnishing
Honing removes material using abrasive tools with rotational and reciprocating movement. Skiving and roller burnishing combines cutting with mechanical smoothing by rollers.
Specify the required process or the acceptance criteria for an approved alternative. Process selection should account for the required bore geometry and surface profile.
Inspection, Traceability and Documents
| Inspection Area | Requirements to Agree |
|---|---|
| Material | Grade, heat identification and chemistry |
| Mechanical properties | Supplied condition and required test results |
| Finished dimensions | ID, OD, wall, length and straightness |
| Bore geometry | Geometric limits, measurement method and positions |
| Surface | Roughness parameters and surface acceptance |
| Hardness | Method, location and limits, where required |
| Additional testing | NDT method, coverage, acceptance criteria and reports |
Request EN 10204 3.1 documentation at the inquiry stage. List finished bore reports separately so the inspection package covers the supplied product.
Additional NDT under EN 10305-1 is specified through order options. Agree the required scope, reporting and any third-party witness points before production. hublebas.co.uk
For cylinder barrels, include the operating conditions and assembly requirements in the technical review. The final cylinder design determines pressure suitability and assembly acceptance.
Applications
| Buyer or Industry | Components to Evaluate |
|---|---|
| Hydraulic cylinder manufacturers | Barrels and sleeves whose approved drawings specify C45E |
| Precision machining companies | Tubular blanks for machining and a defined treatment route |
| Machinery manufacturers | Precision sleeves, housings and tubular mechanical components |
| Maintenance and replacement suppliers | Components matched to an approved drawing and material specification |
Application suitability is reviewed using the material condition, dimensions, fabrication route and operating requirements.
Order Support and Export Packing
Dongmeng Group reviews specifications for material supply, cutting, end preparation, further processing and inspection. Include all required operations in the RFQ so they can be identified in the quotation.
Packing requirements can include:
Compatible temporary corrosion protection.
Protective end caps.
Supported bundles or crates.
Identification linked to inspection records.
Protection suited to shipment and storage conditions.
Provide the destination, handling requirements and preferred trade term when requesting a quotation.
Frequently Asked Questions
1. Which delivery condition should I specify?
Use the condition required by the component drawing. Compare strength and elongation together, then identify any machining, forming, welding or heat treatment planned after delivery.
2. Can I order C45E +SR?
Submit the requirement for review. Table A.3 provides no numerical C45E +SR properties, so mechanical acceptance values and tests must be agreed for that order.
3. Can I request quenched and tempered C45E?
Specify the required final properties, hardness, inspection and dimensions for review. Quenched and tempered requirements need a separate agreement from the basic condition table above.
4. Should I choose C45E, C35E or E355?
Compare the drawing requirements and certified properties in the same condition. Also consider the fabrication route, weld design and any required thermal treatment.
5. Is C45E the same as C45 or SAE 1045?
These designations require a specification comparison. Confirm the exact grade, chemistry limits, product standard, condition and inspection documents before substitution.
6. Can you quote H8 or H9 bores with a specified roughness?
Include bore diameter, length, wall and the complete surface requirement. Feasibility and inspection scope are reviewed before the quotation is finalized.
7. Is C45E a standard grade in EN 10305-4?
The standard grade table in EN 10305-4 lists E215, E235 and E355. Order this C45E product against the agreed EN 10305-1 requirements; a Part 4 requirement needs separate review. hublebas.co.uk
8. Can I weld the tube after honing?
Provide the joint details for review. The processing plan should address welding procedure requirements, potential distortion and final bore inspection after fabrication.
9. Which inspection documents should I request?
Specify the material certificate, finished dimensional report, bore surface report and any additional testing records. Identify third-party inspection stages at the inquiry stage.
10. What are the MOQ, sample terms and lead time?
These are confirmed against the size, condition, quantity and inspection requirements. Custom lengths and processing should be included in the RFQ.
Request a C45E Honed Tube Quote
| RFQ Item | Information Required |
|---|---|
| Material | C45E / 1.1191 and required standard |
| Condition | Supplied condition and any final treatment |
| Dimensions | Finished ID × OD or wall × length |
| Bore acceptance | Size tolerance, geometry and surface profile |
| Quantity | Pieces, metres or total weight |
| Processing | Machining, welding, heat treatment or coating |
| Documents | Certificate type and inspection requirements |
| Delivery | Destination, trade term and required date |
Office Information
Xi'an Dongmeng Group Co., Ltd.
| Contact | Details |
|---|---|
| Phone | +86 15769214734 |
| office@dongmjd.com | |
| +86 15769214734 | |
| Office Address | Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China |
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