Skived and roller-burnished tubes use a defined finishing route for the inside surface. Buyers must copy the approved bore tolerance, roughness, straightness, material, starting dimensions, and inspection-document requirements from the drawing. The Kanpur quotation must confirm the exact offered size, condition, finishing capability, and date; this page provides no stock band.
When should a buyer choose skived and roller-burnished tubes instead of honed tubes?
Choose skiving and roller burnishing, honing, or another finishing route only from the approved drawing and process qualification. Batch size, repair status, speed, geometry, and roughness do not create a universal selection rule.
Skiving removes material and roller burnishing plastically works the surface; honing is an abrasive finishing route. The approved process definition must state the required material removal, geometry, texture, material effects, cleanliness, and inspection.
Do not rank these processes by production volume, repair use, size flexibility, speed, cost, or acceptance without current evidence from the qualified finisher for the exact part. A different route is a controlled substitution when the drawing names one.
Procurement should ask whether the finished bore meets the same functional requirements: ID tolerance, roughness, straightness, roundness, and cleanliness. If the drawing says honed and the supplier offers skived/roller-burnished, get engineering approval before accepting the alternative.
How does roller burnishing change surface roughness and seal performance?
Roller burnishing plastically works the surface after the cutting stage, but that does not establish a seal-life or roughness outcome. Copy the approved texture, geometry, material, cleanliness, and inspection requirements from the design.
Surface function is not established by Ra alone. The design may control multiple texture parameters, lay, geometry, material condition, oil retention, cleanliness, and seal compatibility. Do not infer performance from a burnished or honed label.
ISO 4287 roughness language helps avoid subjective arguments. If the buyer needs Ra maximum, Rz range, or another parameter, write it into the RFQ. Ask for the measurement method and sampling locations for critical cylinders. A beautiful-looking bore can still be wrong if it is too polished for the seal package.
Cleanliness after skiving is essential. Chips and fines must be removed before dispatch. A capped and oiled bore protects both the finish and the dimensional investment during transport.
What starting tube quality is needed before skiving and burnishing?
Start with the parent-tube standard, grade, delivery condition, dimensions, machining allowance, straightness, wall limits, and surface acceptance approved by the process design. Do not default to E355 or BK+S.
A finishing route cannot be assumed to correct every parent-tube nonconformity. The approved process plan must define acceptable surface condition, eccentricity, straightness, wall, machining allowance, and inspection for the selected parent tube; do not prefer a manufacturing route from a generic comparison.
The starting ID and minimum wall must allow the approved material removal needed to reach the final bore. If a buyer supplies a pre-existing tube for conversion, require inspection against the specified parent and finished acceptance criteria before work is accepted.
Wall variation matters because skiving follows the bore and the final barrel still needs enough wall for pressure, ports, and end machining. For safety-critical cylinders, design calculations should use minimum wall after finishing, not nominal wall before machining.
What should be compared in a honing versus skiving quotation?
Compare the approved finished dimensions, texture, geometry, minimum wall, material effects, qualification, inspection, quoted scope, price, and timing. This page assigns no speed, flexibility, batch, repair, or rework advantage.
A simple per-metre finishing rate may omit setup, tooling, parent-tube condition, inspection, fixed lengths, preservation, and delivery. Compare current written offers for the same approved scope rather than assuming a process advantage from batch size.
Inspection records should be the same standard whichever process is used. Ask for finished ID readings, roughness report, visual bore check, and MTC for the parent tube. If the supplier cannot document the finished bore, the buyer has little evidence if the cylinder leaks later.
Also compare downstream machining and assembly requirements from the approved process plan. Do not predict fitting time, rework, warranty, or total cost without evidence for the exact component and qualified route.
Theoretical weight and dimensions of skived & burnished tubes
Estimate the parent tube's theoretical mass from nominal OD and wall before comparing a skived and roller-burnished quotation. The finished dispatch should still be accepted against measured dimensions, ordered length, piece count, MTC, and scale weight.
For a 63.0 mm OD tube with a 4.0 mm wall, giving a 55.0 mm nominal ID, the unrounded site formula is (63.0 − 4.0) × 4.0 × 0.02466 = 5.81976 kg per metre, displayed as 5.82 kg/m. At that displayed rate, a 6-metre length is 34.92 kg and 150 lengths are 5,238.00 kg, or about 5.24 MT. Use the total for handling and freight planning, then replace it with the actual dispatch weight on commercial documents.
The matching 63.0 mm OD row in the site's indicative precision-tube price list is ₹98 to ₹122 per kg. That range applies to the listed DIN 2391 size as a budget reference. Skiving, roller burnishing, H8 or H9 acceptance, roughness reporting, fixed lengths, quantity, and delivery location must be confirmed in the supplier's firm quotation.
The finishing process changes the bore surface and removes stock during skiving, so a nominal parent-tube calculation is not a certificate of final mass or pressure suitability. Inspect the finished ID, minimum wall, straightness, and roughness against the drawing. The cylinder designer must approve pressure capacity from the complete design rather than from a general bar figure or the theoretical weight alone.
Buying skived and burnished cylinder tubes in the Kanpur steel market
For a Kanpur-basis skived and roller-burnished tube RFQ, require the quotation to confirm the offered lot, finish, material location, inspection scope, freight, and timing. Do not infer sourcing or delivery capability from this page.
The business address is 83/124, Steel Market, Bartan Bazar, Afim Kothi, Basanti Nagar, Juhi, Kanpur 208014. A written quotation must confirm the offered material location and whether any requested checks of bore straightness, surface condition, or documents can occur before release.
Uttar Pradesh Jal Nigam, irrigation, PWD, and JJM contractors should follow the tender's approved material and document schedule. An EN 10204 3.1 MTC covers the parent tube's heat-specific chemical and mechanical results. It does not by itself certify the finished bore, so request the agreed ID, tolerance, roughness, and straightness readings where the contract requires them.
Include the consignee and required date on the RFQ. Require the quotation to confirm stock, the legally applicable GST rate, freight, packing, delivery terms, and whether TPI is available at the offered material location. State bore oiling and end protection on the PO rather than assuming them.
How to specify skived & roller-burnished tubes on your RFQ
Specify the parent tube and the finished bore as two items. If the drawing says honed, do not accept skived and roller-burnished finish without engineering approval, even when the quoted H8 or H9 class looks the same.
Start with the approved parent-tube standard, grade, delivery condition, OD, starting ID or wall, and machining allowance. Then state the approved finished ID, tolerance, surface-texture parameters, straightness, and whether a honed cross-hatch is mandatory. The parent-tube MTC does not certify the finished bore; require the specified post-process reports.
Request written confirmation of the lot, material location, inspection availability, finish, timing, and scope. The quotation must confirm the exact starting size and finishing capability. Keep the legally applicable tax, packing, preservation, end protection, and project-specific freight as separate quotation lines.
Compare honing and skiving on finished tolerance, roughness, minimum wall, batch quantity, and inspection records, not on a finishing rate alone. If the seal package needs oil-retaining cross-hatch, say so on the RFQ. Destination, quantity, and required date belong on the enquiry so dispatch is confirmed for that order.
Define acceptance at the same production stage for every offer. State whether the supplier delivers a finished bore or only a parent tube, whether end machining occurs before or after ID finishing, and who owns cleaning, preservation, caps, dimensional reporting, and final release. If the buyer supplies the parent tube, identify its heat or lot and record incoming inspection before processing begins.
For the finished-bore report, copy the drawing’s measurement locations, number of readings, temperature basis, instrument resolution, and treatment of taper, ovality, straightness, and local surface defects. Surface-texture results should name the required parameters, evaluation settings where specified, sampling positions, and acceptance limits. A nominal ID or photograph of a reflective bore is not equivalent to that report.
Handle process substitution as a documented deviation. The supplier should describe the proposed route, starting allowance, tooling constraints, post-process condition, inspection evidence, and any effect on later welding, port machining, assembly, cleaning, or preservation. Engineering should approve or reject that deviation against the controlled drawing before price, timing, or material allocation becomes binding.
The quotation should separate parent material, ID finishing, fixed-length cutting, end preparation, inspection, preservation, packing, freight, tax, and rejected-piece responsibility. This makes offers comparable without implying that one process is inherently faster, cheaper, smoother, or more suitable. Record the approved route and report set on the PO so receipt inspection can verify the same scope.
- Give parent OD and wall, then the finished ID after skiving.
- Name the approved standard, grade, and delivery condition for the starting tube.
- State the approved finished-ID limits, surface-texture parameters, and whether honing may be substituted.
- Require the parent inspection-document type plus finished-bore and roughness reports as named by the purchase order.
- Quote ex-warehouse Kanpur, then add consignee and required date for freight.