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EN 10305-1 25CrMo4 Honed Seamless Steel Tube
Chromium-Molybdenum Precision Tubing for Hydraulic Cylinder and OEM Component Procurement
Xi'an Dongmeng Group Co., Ltd. supplies 25CrMo4 honed seamless steel tubes for hydraulic cylinder manufacturers, precision machining companies and industrial OEMs. Each inquiry is reviewed against the required material condition, finished bore dimensions, subsequent processing and inspection documents, helping buyers obtain a quotation that matches their drawing and acceptance requirements.
25CrMo4, material number 1.7218, is a chromium-molybdenum alloy steel. Procurement should specify both the steel grade and its delivery condition, together with the requirements for the finished honed bore.
Request a Quote | Send Your Drawing
For an initial quotation, send the required bore diameter, outside diameter or wall thickness, length, delivery condition and quantity.
What Matters When Buying 25CrMo4 Honed Tube?
A useful specification connects material properties with the way the tube will be processed and accepted.
| Purchasing decision | Information to confirm |
|---|---|
| Material condition | +C, +LC or an individually agreed heat-treated condition |
| Subsequent manufacturing | Turning, welding, heat treatment or further bore finishing |
| Finished bore | Diameter limits, surface texture and geometrical requirements |
| Mechanical acceptance | Required tensile, yield, elongation, hardness or impact properties |
| Documentation | Material certificate, finished dimensional report and agreed additional tests |
If the component will be welded or heat treated after delivery, include that information in the inquiry. It affects the appropriate supply condition and the stage at which final bore acceptance should take place.
Product Specifications
| Item | Specification / Ordering Requirement |
|---|---|
| Product | Honed seamless precision steel tube |
| Steel grade | 25CrMo4 |
| Material number | 1.7218 |
| Tube supply basis | EN 10305-1:2016, with additional-grade requirements specified in the order |
| Manufacturing route | Seamless cold drawing, followed by the agreed finishing operations |
| Finished inside diameter | To drawing, with explicit upper and lower limits |
| Outside diameter | To drawing or agreed dimensional specification |
| Wall thickness | Nominal and minimum local wall requirements to be distinguished |
| Length | Required finished length and tolerance |
| Bore tolerance | H8, H9 or individually specified limits, subject to feasibility confirmation |
| Bore surface | Honed; roughness and surface-profile requirements to be agreed |
| Straightness / Geometry | Specify straightness, roundness and cylindricity where required |
| Ends | Cut and deburred; additional end preparation to drawing |
| Inspection documents | Specify EN 10204 document type at order |
| Additional inspection | Test method, coverage and acceptance criteria to be agreed |
| Packing | Bore protection, end protection and transport packing as specified |
Available dimensional combinations and finishing requirements are confirmed during quotation. A tolerance designation alone does not establish the supplier's production range.
Chemical Composition of 25CrMo4
The following values refer to cast analysis, expressed as percentage by mass, for 25CrMo4 under EN 10305-1:2016 Annex A.
| Element | Requirement, % |
|---|---|
| Carbon, C | 0.22–0.29 |
| Silicon, Si | ≤ 0.40 |
| Manganese, Mn | 0.60–0.90 |
| Phosphorus, P | ≤ 0.025 |
| Sulfur, S | ≤ 0.035 |
| Chromium, Cr | 0.90–1.20 |
| Molybdenum, Mo | 0.15–0.30 |
These limits are consistent with Mannesmann's EN 10305-1 25CrMo4 reference data. Product-analysis acceptance should follow the applicable standard provisions.
Mechanical Properties by Delivery Condition
The room-temperature requirements below distinguish the conditions for which EN 10305-1:2016 Table A.3 provides numerical values.
| Condition | Description | Tensile Strength Rm, MPa | Yield Strength | Elongation A, % |
|---|---|---|---|---|
| +C | Cold drawn / hard | ≥ 720 | No numerical value in the grade row | ≥ 4 |
| +LC | Cold drawn / soft | ≥ 670 | No numerical value in the grade row | ≥ 6 |
| +SR | Cold drawn and stress relieved | To be agreed | To be agreed | To be agreed |
| +A | Soft annealed | To be agreed | To be agreed | To be agreed |
| +N | Normalized | To be agreed | To be agreed | To be agreed |
Table A.3 leaves the 25CrMo4 entries for +SR, +A and +N blank. These conditions require an agreed property specification; the blank entries should not be replaced with values borrowed from another grade. Propriedades mecânicas (10305-1)
Quenched and tempered supply: If your drawing requires +QT, specify the final mechanical properties, relevant dimensions, testing and processing sequence. +QT is outside the five delivery conditions listed in EN 10305-1 Table 1 and requires a separate contractual specification.
Choosing the Right Supply Condition
+C: Cold-Drawn Tube
For +C, the tube receives no final heat treatment after the last cold-drawing operation. Its strength reflects the cold-worked condition. hublebas.co.uk
This condition may suit a drawing that accepts the specified cold-drawn properties. For components involving substantial forming, welding or subsequent heat treatment, review the complete manufacturing route before ordering.
+LC: Limited Final Cold Drawing
For +LC, heat treatment is followed by a drawing pass with limited reduction. It has its own specified strength and elongation requirements. hublebas.co.uk
Specify +LC explicitly when required by the component drawing or purchasing specification.
Individually Agreed Heat-Treated Supply
25CrMo4 belongs to the chromium-molybdenum quenching and tempering steel family. Its final properties depend on condition and processing. Manufacturer-specific or bar-product data should not automatically become acceptance values for honed precision tubes. steelnavigator.ovako.com
For a heat-treated order, include:
Required strength and elongation.
Hardness limits, where applicable.
Impact-test temperature and acceptance values, if required.
Finished dimensions and minimum local wall thickness.
The stage at which mechanical and bore inspection will be performed.
Send Your Required Condition and Drawing for Review
25CrMo4 Compared with Other Honed Tube Materials
| Material | Selection consideration |
|---|---|
| 25CrMo4 | Chromium-molybdenum alloy steel for components specifying this grade and an appropriate delivery or heat-treated condition |
| 42CrMo4 | Higher-carbon chromium-molybdenum grade; select against the required heat-treatment response and component properties |
| E355 | Non-alloy precision tube grade worth reviewing when the drawing permits an alternative material route |
| C45E | Medium-carbon non-alloy special steel; evaluate machining, welding and heat-treatment requirements before substitution |
| ASTM A519 Grade 4130 | Related chromium-molybdenum tubing option under a different specification; requires a technical comparison before substitution |
Grade selection should follow the component requirements. For example, EN 10305-1 lists the same +C and +LC minimum tensile values for 25CrMo4 and 42CrMo4, although their compositions differ. hublebas.co.uk
4130 is a related designation, but ASTM A519 and EN 10305-1 are separate specifications. Compare chemistry, condition, dimensions and testing before approving an alternative.
Finished Bore Tolerances
H8 and H9 describe bore-size tolerance classes. The following examples show permissible diameter limits in millimetres.
| Nominal Bore | H8 Diameter Limits, mm | H9 Diameter Limits, mm |
|---|---|---|
| 50 mm | 50.000–50.039 | 50.000–50.062 |
| 80 mm | 80.000–80.046 | 80.000–80.074 |
| 100 mm | 100.000–100.054 | 100.000–100.087 |
| 160 mm | 160.000–160.063 | 160.000–160.100 |
Calculated from ISO 286-2 tolerance values and the H-hole lower deviation of zero. These are tolerance examples, not a stock or production-capability list. ISO 286-2:2010
For functional acceptance, specify roundness, cylindricity, straightness and surface texture separately where needed. Diameter limits alone do not fully control these characteristics. ISO 286-2:2010
The final bore tolerance should apply at the agreed inspection stage, particularly when additional welding or heat treatment is planned.
Honed Surface Requirements for Hydraulic Seals
A bore specification should match the selected seal system and operating conditions.
Useful requirements include:
Ra and Rz limits.
Additional surface-profile parameters where specified.
Cross-hatch requirements, if applicable.
Acceptance of scratches, scoring and other surface defects.
Cleaning and protection requirements before assembly.
Seal-surface assessment can require material-ratio and profile parameters such as Rmr, Rpk and Rvk, alongside Ra and Rz. Use the seal manufacturer's requirements to define the acceptance criteria.
Honing and Skiving / Roller Burnishing
Honing removes material using abrasive tooling with rotational and reciprocating movement. Skiving and roller burnishing combines cutting with roller finishing. The processes produce different surface characteristics, so any substitution should be accepted against the drawing and seal requirements. Sunnen – Sunnen Products Company
When honing is mandatory, state that requirement in the RFQ.
Dimensional and Theoretical Weight Examples
The following examples help buyers prepare quantity and freight estimates.
| Finished ID, mm | OD, mm | Nominal Wall, mm | Calculated Weight, kg/m |
|---|---|---|---|
| 50 | 70 | 10 | 14.80 |
| 63 | 85 | 11 | 20.07 |
| 80 | 100 | 10 | 22.20 |
| 100 | 130 | 15 | 42.54 |
| 125 | 160 | 17.5 | 61.50 |
| 160 | 200 | 20 | 88.78 |
Calculation basis: π ÷ 4 × (OD² − ID²) × 0.00785, using millimetres and an assumed density of 7,850 kg/m³.
These are illustrative nominal weights. Actual weight depends on dimensions and tolerances; the table does not establish available sizes.
For pressure-containing components, include the required minimum local wall thickness. The nominal difference between OD and ID does not account for all dimensional variation and eccentricity.
Welding, Heat Treatment and Final Honing
25CrMo4 welding requires consideration of the material condition, joint thickness, restraint, consumables, hydrogen control and thermal procedure. A qualified welding procedure should establish the relevant preheat, interpass and post-weld requirements. metals.ovako.com
For purchasing purposes, identify whether the order is for:
| Supply route | Required clarification |
|---|---|
| Finished honed tube | Final bore acceptance at delivery; subsequent processing to be disclosed |
| Tube blank for further processing | Machining and honing allowances, intended heat treatment and final dimensions |
| Tube with an agreed heat-treated condition | Final property requirements, processing sequence and inspection stage |
Procurement recommendation: Where welding or heat treatment precedes the final precision bore, agree the allowances and finishing sequence before production. This helps coordinate material acceptance with finished-component acceptance.
Applications
25CrMo4 honed seamless tube can be considered for components whose drawings specify this material, including:
Hydraulic cylinder barrels.
Precision sleeves and machined housings.
Hollow shafts and other tubular machine components.
Industrial actuator components.
Custom alloy-steel tube blanks for OEM processing.
Application approval depends on the component design, condition, dimensions and inspection requirements.
For cylinder projects, provide the approved material specification and any relevant pressure, temperature and fatigue requirements. The tube grade alone does not establish the working-pressure rating of a complete cylinder.
Inspection and Documentation
Agree the inspection package before ordering so that the delivered reports match the acceptance criteria.
| Verification area | Information to specify |
|---|---|
| Material identity | Grade, heat number and traceability |
| Chemistry | Applicable composition requirements and analysis basis |
| Mechanical properties | Delivery condition and required test results |
| Finished dimensions | ID, OD, length and applicable wall requirements |
| Bore geometry | Roundness, cylindricity and straightness, where specified |
| Surface texture | Required parameters, measurement method and reporting |
| Additional testing | Method, coverage, acceptance level and inspection stage |
| Release documentation | Certificate type and agreed finished-product reports |
An EN 10204 3.1 certificate is validated by the manufacturer's authorized inspection representative, independent of production. Third-party inspection and any required 3.2 certification should be arranged separately according to the order requirements. lrqa.com
Request a finished-bore inspection report alongside the material certificate when honed dimensions and surface texture are contractual acceptance items.
EN 10305-1 includes optional provisions for longitudinal-imperfection testing and leak-tightness verification. Specify these when required; a hydrostatic-test report should only be included when that test has been ordered and performed. hublebas.co.uk
Request the Proposed Inspection Scope
Packing and Shipment Requirements
Specify packing according to the transport route, storage period and bore-protection requirements.
Options for review include:
Compatible corrosion protection.
Protected tube openings.
Separators to prevent contact damage.
Bundles, crates or support frames appropriate to the shipment.
Labels linking the goods to the agreed identification records.
Packing lists showing dimensions, quantities and package weights.
If the tubes will be cleaned for a particular hydraulic fluid or assembly process, include the required preservation and cleaning conditions in the order.
MOQ, sample availability, production time and shipping arrangements are confirmed against the requested specification and quantity.
Frequently Asked Questions
1. Is 25CrMo4 a carbon steel?
25CrMo4 is a chromium-molybdenum alloy steel, identified by material number 1.7218. Specify it accurately on the drawing, purchase order and material certificate.
2. What strength should I specify?
Use the requirements for the intended delivery condition. If the design requires yield strength, hardness or other properties beyond the listed condition values, include explicit acceptance requirements in the RFQ.
3. Can I order quenched and tempered honed tube?
Send the required +QT properties, dimensions and drawing for feasibility review. The quotation should identify the applicable property specification, processing sequence and final inspection requirements.
4. Can this tube be used for hydraulic cylinder barrels?
It can be considered when the approved cylinder design specifies 25CrMo4 and the ordered condition and dimensions. Provide the design requirements and planned manufacturing operations for review.
5. Is 25CrMo4 interchangeable with ASTM A519 Grade 4130?
Substitution requires a comparison of the governing specifications, chemistry, condition, dimensions and testing. Obtain design approval before changing the specified grade.
6. Can you quote H8 or H9 bores?
Provide the nominal bore, tolerance class or exact limits, length and geometrical requirements. Feasibility and the proposed inspection method will be confirmed during quotation.
7. What roughness should the bore have?
Use the requirements of the selected seal and component design. Include Ra, Rz and any additional profile parameters specified by the seal manufacturer.
8. Can the tube be welded or heat treated after delivery?
Disclose these operations when requesting a quotation. The material condition, processing allowances and final inspection stage should be coordinated with the component manufacturing route.
9. Which documents should I request?
Specify the EN 10204 certificate type, material traceability and finished-bore report. Add any required mechanical, hardness, impact, NDT or witnessed-inspection requirements to the order.
10. What determines MOQ, price and lead time?
Grade availability, dimensions, condition, finishing, inspection, quantity and packing all affect the quotation. Send a drawing and order quantity so these items can be confirmed together.
Request a 25CrMo4 Honed Tube Quotation
Send your specification to Xi'an Dongmeng Group Co., Ltd. for review.
| RFQ Item | Required Information |
|---|---|
| Material | 25CrMo4 / 1.7218 |
| Standard | EN 10305-1 and any additional contractual requirements |
| Condition | +C, +LC or an individually specified condition |
| Dimensions | Finished ID × OD or wall thickness × length |
| Bore requirements | Tolerance, roughness and geometrical requirements |
| Quantity | Pieces, total length or estimated weight |
| Subsequent processing | Machining, welding, heat treatment or further honing |
| Inspection | Certificate type and additional acceptance tests |
| Delivery | Destination and requested delivery date |
| Attachment | Drawing or purchasing specification |
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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