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Welcome to our premium EN 10305-1 25CrMo4 honed seamless steel tube, the ultimate solution for demanding high-pressure and high-precision applications. Manufactured in strict accordance with the EN 10305-1 standard, this seamless steel tube guarantees exceptional dimensional accuracy and superior internal surface quality. The 25CrMo4 chromium-molybdenum steel composition provides excellent strength, toughness, and wear resistance. The final honed finishing process ensures an ultra-smooth inner surface, minimizing friction and optimizing fluid flow. This honed tube is the ideal choice for hydraulic cylinders, pneumatic systems, and other critical engineering components where reliability and performance are paramount.
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Chemical composition of EN 10305-1 25CrMo4 Carbon Steel Tubes
| Steel grade | C | Si | Mn | P | S | Cr | Mo | Ni | ||||||
| Steel name | Steel number | min. | max. | max. | min. | max. | max. | max. | min. | max. | min. | max. | min. | max. |
| 25CrMo4 | 1.7218 | 0,22 | 0,29 | 0,40 | 0,60 | 0,90 | 0,035 | 0,035 | 0,90 | 1,20 | 0,15 | 0,30 | - | - |
Mechanical properties of 25CrMo4 Cold Rolled Seamless Steel Tube
| Steel grade | Minimum tensile properties | |||||||||||||||||
| Steel name | Steel number | Yield strength (ReH) MPa | Tensile strength ( Rm) MPa | Elongation A% | ||||||||||||||
| For T in mm | For T in mm | For T in mm | ||||||||||||||||
| T≤8 | 8＜T≤20 | 20＜T≤50 | 50＜T≤80 | T≤8 | 8＜T≤20 | 20＜T≤50 | 50＜T≤80 | T≤8 | 8＜T≤20 | 20＜T≤50 | 50＜T≤80 | |||||||
| l | t | l | t | l | t | l | t | |||||||||||
| 25CrMo4 | 1.7218 | 700 | 600 | 450 | 400 | 900 | 800 | 700 | 650 | 12 | 10 | 14 | 12 | 15 | 13 | 16 | 14 | |
Products Delivery condition
| BK | BKW | BKS | GBK | NBK | Q+T |
| +C | +LC | +SR | +A | +N | |
| Cold rolled | Cold drawn | Stress relieved | Annealed | Normalized | Quenched+Tempered |
Products Tolerance
| ID range | Tolerance | ID range | Tolerance |
| 18< d ≤30 | +0/+0.033 | 180< d ≤250 | +0/+0.072 |
| 30< d ≤50 | +0/+0.039 | 250< d ≤300 | +0/+0.081 |
| 50< d ≤80 | +0/+0.046 | 300< d ≤315 | +0/+0.081 |
| 80< d ≤120 | +0/+0.054 | 315< d ≤400 | +0/+0.089 |
| 120< d ≤180 | +0/+0.063 | 400< d ≤500 | +0/+0.097 |
Frequently Asked Questions: EN 10305-1 25CrMo4 Honed Seamless Steel Tube
1. Q: What is the EN 10305-1 standard, and why is it significant for these tubes?
A: The EN 10305-1 is a European standard specifying technical delivery conditions for seamless steel tubes for precision applications. Its significance lies in defining stringent dimensional tolerances (e.g., diameter, wall thickness, straightness), mechanical properties, and testing requirements. Compliance with this standard guarantees a high-quality product with exceptional dimensional accuracy and consistent performance, making it ideally suited for demanding hydraulic and pneumatic systems.
2. Q: What are the key characteristics of the 25CrMo4 steel material?
A: 25CrMo4 is a high-quality chromium-molybdenum alloy steel. Its key properties include high strength coupled with good toughness, excellent fatigue resistance, superior wear resistance, and satisfactory weldability. These characteristics enable the tubes to withstand high pressure, shock loads, and dynamic stresses, making them perfect for critical components like hydraulic cylinder barrels and piston rods.
3. Q: What are the benefits of the honed surface finish?
A: Honing is a precision finishing process that creates an exceptionally smooth, cross-hatched pattern on the tube's inner surface. This offers two primary benefits: It significantly reduces friction and wear on seals and pistons, extending overall system service life, and the cross-hatch pattern aids in lubricant retention for improved performance and traps fine debris to prevent bore scoring.
4. Q: What are the advantages of a seamless tube over a welded alternative?
A: Seamless tubes are manufactured by piercing and rolling a solid billet, resulting in a structure without a welded seam. The key advantage is superior structural integrity and homogeneity, eliminating potential weak points, impurities, or stress concentrations associated with a weld line. Therefore, for high-pressure applications, cyclic loading, or critical safety systems, seamless tubes provide greater reliability and safety.
5. Q: Are your tubes suitable for hydraulic cylinder manufacturing?
A: Absolutely. Our EN 10305-1 25CrMo4 Honed Seamless Steel Tubes are an ideal choice for manufacturing high-performance hydraulic cylinder barrels. The precise dimensions, robust 25CrMo4 material, and smooth honed interior perfectly meet the core demands of hydraulic applications: high pressure resistance, low friction, and long service life.
6. Q: What size ranges and tolerances can you supply?
A: We can supply a wide range of outer diameters, inner diameters, and wall thicknesses. Our specific dimensions and tolerances strictly adhere to EN 10305-1 Grade E (high precision) or other specified grades. Please provide your detailed requirements, and our sales team will confirm the best available solution for you.
7. Q: Do the tubes come with certifications or test reports?
A: Yes. We can provide 3.1 Material Test Certificates, verified by third parties, upon request. These reports include chemical analysis, mechanical property tests (e.g., tensile, yield strength), and hydrostatic test results, ensuring full compliance with the standard and providing you with assured quality traceability.
8. Q: How do I select the correct wall thickness for my application?
A: The correct wall thickness depends on your operating conditions, primarily the system's working pressure and the required safety factor. Our technical team can assist you in the selection process. Based on your pressure data and the strength properties of 25CrMo4 steel, we can help determine the optimal tube that safely withstands the operational loads.
9. Q: Can these tubes be further machined or welded?
A: Certainly. The 25CrMo4 material offers good machinability and weldability. You can perform operations like turning, grinding, or welding. Please note that post-weld heat treatment (such as stress relieving) may be recommended to preserve the material's optimal properties. We advise consulting our technical team for best practice recommendations prior to processing.
10. Q: What are your delivery lead times and packaging methods?
A: Our standard lead times depend on order quantity and specifications and will be confirmed upon order placement. To protect the precise honed inner surface during transit, we employ professional packaging. This includes capping tube ends with plastic plugs, applying anti-corrosive oil and paper, and securing the tubes in robust wooden crates or steel racks to ensure they arrive in perfect condition.
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