Standard map
Common cross-references
- Legacy DIN
- CK45
- EN
- C45E / 1.1191
- EN
- C45 / 1.0503
- SAE/AISI
- 1045
- JIS
- S45C
- GB
- 45
MEDIUM-CARBON STEEL
CK45 / 1045
Round bars & machining blanks
Choose the delivery stage that fits your shaft, rod or general machine part.
- DIAMETER
- 20–350 mm
- LENGTH
- 3–12 m
- CONDITION
- Hot rolled / Normalized / Annealed
Published bar-stock sizes. Cut and rough-machined blanks follow the ordered drawing.
Supply formsRound bars · Cut blanks · Rough-machined blanks
Technical specifications & documents
Grade specifications
Cross-references help compare grades; they do not establish interchangeability. The drawing standard, delivery condition, dimensions and inspection scope define the order.
Supply window
Published specification
- Form
- Round bar
- Diameter
- 20 - 350 mm
- Length
- 3 - 12 m
- Condition
- Hot rolled / Normalized / Annealed
Property reference
Mechanical property requirements
- Property route
- State the product standard, condition, diameter, and required property target
- Test basis
- State the test position, sampling plan, and required result document
Chemistry reference
- Composition basis
- Use the chemistry table for the named CK45, C45E, C45, or SAE 1045 route
- Substitution check
- Compare the full tables before approving S45C or GB 45
Delivery-stage requirements
| Supply stage | What arrives | Confirm before quotation |
|---|---|---|
| Bar stock | Bars in the ordered hot-rolled, normalized or annealed condition, with the agreed surface preparation. | Exact designation and controlling standard; diameter and length; material condition; surface, straightness and any property targets. |
| Cut blanks | Bars cut to the ordered blank length for downstream turning or other machining. | Cut length and tolerance; end preparation; machining allowance; identification after cutting. |
| Rough-machined blanks | Blanks prepared to the rough-machining scope agreed from your drawing. | Drawing revision; rough dimensions and tolerances; remaining allowance; the material condition required at delivery. |
Keep the release record tied to the delivered stage.
Agree MTC and dimensional inspection requirements, plus any specified hardness or mechanical tests. Keep the exact grade and heat or lot identity linked to the delivered blanks.
Heat treatment and surface finish can apply at more than one stage. State each separately in the RFQ.
Application & inspection scope
- Machine shafts
- Gears
- Bolts and studs
- Automotive components
- General machinery parts
- Heat identity and chemical verification
- Mechanical properties for the ordered condition
- Dimensions, surface condition and agreed inspection documents
Buyer questions
Are CK45, C45, AISI 1045, S45C, and 45# interchangeable?
No. They are related medium-carbon steel designations, but they are not automatically interchangeable. State the controlling standard and edition, then review chemistry, product form, condition, dimensions, testing, and any alternative through written purchaser approval.
Is CK45 / 1045 suitable for hydraulic cylinder rods?
CK45 or 1045 may suit some hydraulic cylinder rod applications when strength, straightness, surface condition, machining, and inspection requirements are suitable. Higher-load or fatigue-sensitive routes may require comparison with alloy grades.
Which delivery conditions should CK45 / 1045 buyers specify?
Buyers should specify hot rolled, normalized, annealed, black, peeled, ground, machined, or cut-to-length route where relevant. Add hardness, mechanical-property, tolerance, and surface-condition requirements if they affect the final part.
Documents, tools & technical reading
Processing capabilitiesMTC reading guideOpen matched process routeCK45 vs 1045 vs C45Compare common medium carbon steel naming before RFQ.42CrMo4 vs CK45 hydraulic rodsCompare medium carbon and Cr-Mo alloy rod routes.Hydraulic cylinder rod steel selectionConnect medium carbon steel choice to hydraulic rod requirements.Quality scope & MTC examplesFactory evidence registerExamples show a format; order documents must match your supply.
Source · AISI 1045
AISI 1045 near-surface micrograph after quenching in 10% aqueous PVP and tempering. Vieira et al. (2021), Figure 1, upper-left panel; optical microscopy at 500×, original 50 µm scale retained.
Specimen and condition. Austenitized at 880°C for 60 minutes, quenched in agitated 10% PVP solution, then tempered at 180°C for 60 minutes. The specimen was etched in 2% nital and observed near its surface.
Image treatment. Only the upper-left 10% PVP panel is selected from the unaltered source image. The selected panel is fitted uniformly in the hero, with a maximum display width of 640 pixels. A source-coordinate clip excludes all other panels. The original scale is retained; no pixel retouching, sharpening or generated detail.
Eduardo da Rosa Vieira, Luciano Volcanoglo Biehl, Jorge Luis Braz Medeiros, Vagner Machado Costa, Rodrigo Jorge Macedo — Evaluation of the characteristics of an AISI 1045 steel quenched in different concentration of polymer solutions of polyvinylpyrrolidone, 2021. Figure 1, upper-left 10% PVP panel. DOI and paper · CC BY 4.0.
This research specimen is AISI 1045; it is not identified as CK45 and does not establish interchangeability between designations. It is not a JOTAIN batch or the default condition of supplied bar. Ordered grade, condition and inspection records define the supply.
View the complete source figure
Send your specification
CK45 / 1045 · include the supplied form, standard, size, condition, quantity and destination.
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