Premium CK45 / SAE 1045 Seamless Honed Steel Tubes
1. Description: As a leading carbon steel honed tube manufacturer, we supply high-precision smooth bore steel tubes specifically engineered for hydraulic cylinder barrels.
Why Choose This Material? Our tubes are manufactured from premium medium-carbon steel. In global engineering standards, DIN CK45, EN C45E, SAE 1045, and JIS S45C are functionally equivalent grades. This material provides exceptional tensile strength, superior machinability, and higher wear resistance compared to standard mild steels, making it the globally preferred choice for heavy-duty C45 hydraulic cylinder tubes.
2. Product Specifications
Commodity: CK45 / 1045 Honed Tube
Size Range: Outer Diameter (OD) 40mm*30mm up to 580mm*500mm
Manufacture Method: Cold rolled, hydraulic cold drawn, or hot rolled + deep hole boring
Available Steel Grades:
SAE/AISI: 1045, 1020, 1026, 4130, 4140
DIN / EN: CK45, C45E, E355, 25CrMo4, 42CrMo4, E410, E470, ST52
JIS / GB: S45C / 45#, 20#, 16Mn, Q345B-E, 27SiMn
3. Delivery Condition (Heat Treatment)
| DIN Code | EN Code | Treatment Status |
|---|
| BK | +C | Cold rolled / Cold drawn |
| BKW | +LC | Cold drawn (Soft) |
| BKS | +SR | Stress relieved |
| GBK | +A | Annealed |
| NBK | +N | Normalized |
| Q+T | Quenched + Tempered |
4. H8 ID Tolerance Standard
| Inner Diameter Range (mm) | H8 Tolerance (mm) |
|---|
| 18 < ID ≤ 30 | +0 / +0.033 |
| 30 < ID ≤ 50 | +0 / +0.039 |
| 50 < ID ≤ 80 | +0 / +0.046 |
| 80 < ID ≤ 120 | +0 / +0.054 |
| 120 < ID ≤ 180 | +0 / +0.063 |
| 180 < ID ≤ 250 | +0 / +0.072 |
| 250 < ID ≤ 300 | +0 / +0.081 |
| 300 < ID ≤ 315 | +0 / +0.081 |
| 315 < ID ≤ 400 | +0 / +0.089 |
| 400 < ID ≤ 500 | +0 / +0.097 |
5. Bore Treatment & Surface Quality
Roughness Control: Ra 0.25μm max (or Ra 0.35μm max) for honed tubes; Ra 0.25μm max for skived & roller burnished tubes.
End Finish: Plain ends with square cuts, free of burrs for honed tubes. Slightly bevelled ends for skived & roller burnished tubes.
What is the difference between Honed Tubes and Skived & Roller Burnished Tubes?
In the hydraulic cylinder industry, both solutions deliver excellent internal roughness (Ra) to protect hydraulic seals. Honing uses abrasive stones to create a cross-hatch pattern, which is excellent for oil retention but does not change the internal surface hardness. Skiving & Roller Burnishing (SRB) compresses the metal surface, resulting in a mirror-like finish and simultaneously increasing the internal surface hardness due to cold working stress. You can specify either process for your SAE 1045 seamless tubes based on your application demands.
Order Information FAQ
1. MOQ and Packing:
Generally 2-3 tons/size for OD below 250mm, and 10 tons/size for OD above 250mm (or special alloy grades). Tubes are packed in bundles tied with steel strips, coated with int/ext oil, capped, and externally wrapped by PVC and knit bags. Customized packing is available.
2. Delivery Time:
Around 40-60 days depending on sizes and quantities (including 15-30 days for raw material sourcing). For example, 3 tons of 50mm*40mm CK45 honed tubes with Ra 0.25μm max takes at least 30 days for the honing process.
3. Warranty & Guarantee:
6 months warranty since delivery. We welcome third-party or customer's inspections before shipment.
4. Payment Method & Quality Control:
We accept T/T, L/C, or D/P (subject to credit evaluation). 90% of our tubes are made from hot rolled seamless pipes sourced from leading steel mills, ensuring top-tier finished quality. We inspect raw materials strictly as per specifications, with rigorous QC at every production stage.
Company Profile
We are a manufacturer of cold drawn, cold rolled, and hydraulic cold drawn steel tubes with OD up to 356mm since 2002. Covering an area of about 32,000M², we have 12 standard workshops with 2 hydraulic cold drawing benches, 4 chain cold drawing benches, and 2 ERW mills. Our facilities cover all production procedures from pickling, cold drawing, heat treating, saw cutting, straightening, inspection, and packing to further machining & turning, cold drawing die fabrication, and equipment repair & maintenance.
