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For engineers designing high-performance hydraulic systems that operate under extreme pressure, heavy shock loads, and demanding cycle counts, the EN 10305-1 42CrMo4 Honed Seamless Steel Tube represents the pinnacle of cylinder barrel technology. This premium seamless steel tube is manufactured from 42CrMo4-a versatile chromium-molybdenum alloy steel-and is precision-honed to an impeccable internal finish as specified by the stringent EN 10305-1 E standard for cold-drawn seamless tubes. The combination of the material's inherent high strength, achieved through quenching and tempering to high tensile strengths (often exceeding 900 MPa), and the honed internal surface creates an unparalleled solution for high-pressure hydraulic cylinders, robust industrial machinery, and mobile off-road equipment. If your application requires a precision honed tube that delivers superior wear resistance, excellent fatigue strength, and reliable performance under the most strenuous conditions, 42CrMo4 honed tubing provides the critical durability and longevity to minimize downtime and maximize operational efficiency.
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What is EN 10305-1 42CrMo4 Honed Seamless Steel Tube
EN 10305-1 42CrMo4 Honed Seamless Steel Tube is a high-strength alloy steel precision tube manufactured through cold drawing and honing processes. Designed primarily for hydraulic cylinder barrels, this material combines excellent tensile strength, wear resistance, machinability, and dimensional stability.
Compared with conventional carbon steel honed tubes, 42CrMo4 honed tubes provide significantly higher mechanical strength and fatigue resistance, making them suitable for heavy-duty hydraulic cylinders used in mining machinery, construction equipment, marine systems, agricultural machinery, and industrial automation equipment.
As an experienced manufacturer and exporter, Xi'an Dongmeng Group Co., Ltd supplies customized honed tubes with H7, H8 and H9 tolerances, precision-machined inner diameters, and export-grade packaging for global hydraulic cylinder manufacturers.
Specification chart of Acero E355 Seamless Tubes
| size in Mm | 5 To 1219.2 |
|---|---|
| Schedule | Schedule XS, Schedule 160, Schedule 40, Schedule XXS, Schedule 80 Supplier and Manufacturer |
| Standard | JIS, EN, DIN, GB, IS, AISI, ASME, ASTM |
| Seamless Pipe Size in MM | 4 to 219 Wall thickness: 0.5 to 20 |
| Welded Pipe Size in MM | 5 to 1219.2 |
| Seamless Tube Size in MM | 3.35 To 101.6 |
| Length | Double Random, Single Random, Standard & Cut length |
| Wall Thickness in inch | 0.020 to 0.220 |
| Type | U bent, Straight, Seamless, Round, Welded, EFW, Tube Coil, ERW, Hydraulic, LSAW, Square, Fabricated, Boiler, Rectangular |
| Finish | BA, Polished, AP, MF |
| Form | Square, Hydraulic, Rectangular, Clad, U bent, Boiler, Hollow, LSAW, Straight, Round, |
| End | Beveled, Plain, Treaded |
| Pipe Marking | All Pipes are marked as follows: Supplier or Manufacturer's Name, Standard, Grade, OD, Thickness, Length, Heat Number |
EN 10305-1 E355 Carbon Steel Pipes Mechanical Properties
| Tensile Strength | Elongation | ||
|---|---|---|---|
| MPa Minimum | MPa Minimum | ksi Minimum | Percentage |
| 340 | 480 | – | 25 |
| 490 | 630 | – | 22 |
| 440 | 570 | – | 21 |
| – | – | – | – |
| 460 | - | - | 21 |
| 540 | - | - | 18 |
| 550 | 700 | - | 22 |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| 290 | 430 | - | 30 |
| 350 | 480 | - | 25 |
| 490 | 630 | - | 22 |
Chemical Composition of En 10305-1 Steel Tubes
| Carbon | Silicon | Manganese | Phosphorous | Sulphur | Molybdenum | Nickel | Chromium | Copper | Others |
|---|---|---|---|---|---|---|---|---|---|
| maximum 0.17 | maximum 0.35 | maximum 1.20 | 0.025 | 0.025 | – | – | – | – | – |
| maximum 0.22 | maximum 0.55 | maximum 1.60 | 0.025 | 0.025 | – | – | – | – | – |
| maximum 0.21 | maximum 0.35 | 0.40-1.10 | 0.025 | 0.025 | – | – | – | – | – |
| 0.20-0.30 | maximum 0.40 | 1.20-1.50 | 0.035 | 0.035 | – | – | – | – | – |
| 0.32-0.39 | maximum 0.40 | 0.50-0.80 | 0.035 | 0.035 | maximum 0.10 | – | maximum 0.40 | – | – |
| 0.42-0.55 | maximum 0.40 | 0.50-0.80 | 0.035 | 0.035 | maximum 0.10 | – | maximum 0.40 | – | – |
| 0.16-0.22 | 0.10-0.50 | 1.30-1.70 | 0.03 | 0.035 | – | – | – | – | V0.08-0.15 |
| 0.22-0.29 | maximum 0.40 | maximum 1.50 | 0.035 | 0.035 | 0.15-0.25 | maximum 0.40 | – | – | – |
| 0.22-0.29 | maximum 0.40 | 0.60-0.90 | 0.035 | 0.035 | 0.15-0.30 | maximum 0.40 | 0.90-1.20 | – | – |
| 0.38-0.45 | maximum 0.40 | 0.60-0.90 | 0.035 | 0.035 | 0.15-0.30 | – | 0.90-1.20 | – | – |
| maximum 0.10 | maximum 0.05 | maximum 0.70 | 0.025 | 0.015 | – | – | – | – | Al min 0.025 |
| maximum 0.17 | maximum 0.35 | maximum 1.20 | 0.025 | 0.015 | – | – | – | – | – |
| maximum 0.22 | maximum 0.55 | maximum 1.60 | 0.025 | 0.015 | – | – | – | – | – |
Din En 10305-1 Material Pipe Size Chart
| 1/8 Inch IPS(.405 Inch Outer Diameter) | 3 1/2 Inch IPS( 4.000 Inch Outer Diameter) |
| 3/8 Inch IPS(.675 Inch Outer Diameter) | 5 Inch IPS( 5.563 Inch Outer Diameter) |
| Schedule 40, 80 | Schedule 10, 40, 80, 160, XXH |
| 1/4 Inch IPS(.540 Inch Outer Diameter) | 4 Inch IPS(4.500 Inch Outer Diameter) |
| Schedule 10, 40, 80 | Schedule 10, 40, 80, 160, XXH |
| Schedule 10, 40, 80, 160, XXH | Schedule-40 (.375) |
| Schedule 10, 40, 80 | Schedule 10, 40, 80, 160, XXH |
| 1/2 Inch IPS(.840 Inch Outer Diameter) | 6 Inch IPS(6.625 Inch Outer Diameter) |
| Schedule 5, 10, 40, 80, 160, XXH | Schedule 5, 10, 40, 80, 120, 160, XXH |
| 3/4 Inch IPS(1.050 Inch Outer Diameter) | 8 " IPS(8.625 Inch Outer Diameter) |
| Schedule 10, 40, 80, 160, XXH | Schedule 5, 10, 40, 80, 120, 160, XXH |
| 1 Inch IPS:(1.315′ Outer Diameter) | 10 Inch IPS(10.750 Inch Outer Diameter) |
| Schedule 5, 10, 40, 80, 160, XXH | Schedule 10, 20, 40, 80 (.500), TRUE 80(.500) |
| 2 Inch IPS(2.375 Inch Outer Diameter) | 16 Inch IPS(16.000 Inch Outer Diameter) |
| 1-1/4 Inch IPS(1.660 Inch Outer Diameter) | 12 Inch IPS(12.750 Inch Outer Diameter) |
| 1-1/2 Inch IPS(1.900 Inch Outer Diameter) | 14 Inch IPS(14.000 Inch Outer Diameter) |
| Schedule 10, 40, 80, 160, XXH | Schedule10 (.188), Schedule40 (.375) |
| Schedule 10, 40, 80, 160, XXH | Schedule 10, 20, 40(.375), TRUE40(.406), Schedule80(.500) |
| Schedule 10, 40, 80, 160, XXH | Schedule10(.188), Schedule40(.375) |
| 2 1/2 Inch IPS(2.875 Inch Outer Diameter) | 18 Inch IPS (18.000 Inch Outer Diameter) |
| 3 Inch IPS( 3.500 Inch Outer Diameter) | Schedule 5, 10, 40, 80, 160, XXH |
Equivalent of E355+sr Din En 10305-1 Tube
| Product | Deutsches Institut für Normung | European Standards | British Standards | National Futures Association | American Society for Testing and Material | American Society Of Mechanical Engineers |
|---|---|---|---|---|---|---|
| EN 10305-1 E235 | – | EN 10305-1 E235 | – | – | – | – |
| EN 10305-4 E355 | – | EN 10305-4 E355 | – | – | – | – |
| EN 10305-1 E355 | – | EN 10305-1 E355 | – | – | – | – |
| EN 10305-1 26Mn5 | DIN 26Mn5 | EN 10305-1 26Mn5 | – | ASTM SAE 1526 | – | – |
| EN 10305-1 E255 | – | EN 10305-1 E255 | – | – | – | – |
| EN 10305-1 C35E | DIN 17204 Ck35 | EN 10305-1 C35E | NFA A 35-552 XC 32 | ASTM A519 1035 | ASME SA 519 1035 | – |
| EN 10305-1 E41020V1 | – | EN 10305-1 E41020V1 | – | – | – | – |
| EN 10305-1 C45E | DIN 17204 Ck45 | EN 10305-1 C45E | – | ASTM A519 1045 | ASME SA 519 1045 | – |
| EN 10305-1 26Mo2 | – | EN 10305-1 26Mo2 | – | – | – | – |
| EN 10305-1 42CrMo4 | DIN 17204 42CrMo4 | EN 10305-1 42CrMo4 | NFA EN – 42CrMo4 | ASTM A 519 4142 | – | – |
| EN 10305-1 25CrMo4 | DIN 17200 25CrMo4 | EN 10305-1 25CrMo4 | NFA EN . 25CrMo4 | – | – | – |
| EN 10305-4 E235 | – | EN 10305-4 E235 | – | – | – | – |
| EN 10305-4 E215 | – | EN 10305-4 E215 | – | – | – | – |
Acier E355 Welded Tube Size
| Wall Thickness | Outer Diameter Sizes in Inch |
|---|---|
| .010 | 1/16, 1/8, 3/16 |
| .020 | 1/16, 1/8, 3/16, 1/4, 5/16, 3/8 |
| .120 | 1/2, 5/8, 3/4, 7/8, 1, 1 1/4, 1 1/2, 2, 2 1/4, 2 1/2, 3 |
| .083 | 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1 1/4, 1 1/2, 1 5/8, 1 7/8, 2, 2 1/2,3 |
| .012 | 1/8 |
| .016 | 1/8, 3/16 |
| .028 | 1/8, 3/16, 1/4, 5/16, 3/8, 1/2, 3/4, 1, 1 1/2, 2 |
| .035 | 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 16, 5/8, 3/4, 7/8, 1, 1 1/4, 1 1/2, 1 5/8, 2, 2 1/4 |
| .134 | 1 |
| .049 | 3/16, 1/4, 5/16, 3/8, 1/2, 16, 5/8, 3/4, 7/8, 1, 1 1/8, 1 1/4, 1 1/2, 1 5/8, 2, 2 1/4 |
| .065 | 1/4, 5/16, 3/8, 1/2, 16, 5/8, 3/4, 7/8, 1, 1 1/4, 1 1/2, 1 5/8, 1 3/4, 2, 2 1/2, 3 |
| .095 | 1/2, 5/8, 1, 1 1/4, 1 1/2, 2 |
| .109 | 1/2, 3/4, 1, 1 1/4, 1 1/2, 2 |
| .250 | 3 |
| .125 | 3/4, 1, 1 1/4, 1 1/2, 2, 3, 3 1/4 |
| .375 | 3 1/2 |
E355 Steel Round Tube Dimension Tolerance
| Grade | Sizes | Outer Diameter Tolerance | Tolerance |
|---|---|---|---|
| Hot rolled | Outer Diameter – 80 Outer Diameter > 80 WT < 12 Wall = 12 | ± 0.4 ± 0.5 % of Outer Diameter | ± 0.7 ± (5 % x WT + 0.1 |
| Cold Worked, cold rolled and cold drawn | Outer Diameter < 40 Outer Diameter 40 - 80 Outer Diameter > 80 WT < 6 WT 6 = 8 WT > 8 | + 0.30/- 0 *+ 0.35/- 0 *+ 0.40/- 0 | ± 0.30 ± 0.35 ± 0.40 |
| Hot rolled peeled tube | All sizes WT < 12 Wall = 12 | + 0.25/- 0 mm | ± 0.8 ± (5 % x WT+ 0.2) |
Machining Performance Analysis
42CrMo4 offers excellent machinability after proper heat treatment.
Advantages include:
Easy CNC turning and boring
Stable dimensional control
Excellent honing performance
Suitable for precision hydraulic cylinder production
High surface finish quality
Recommended machining methods:
CNC Turning
Deep Hole Boring
Honing
Skiving & Roller Burnishing
Thread Machining
Weldability Analysis
42CrMo4 can be welded under controlled procedures.
Recommendations:
Preheating: 200–300°C
Low-hydrogen electrodes
Controlled cooling
Post-weld stress relief treatment
For critical hydraulic applications, seamless tube construction is generally preferred over welded assemblies.
Corrosion Resistance Analysis
42CrMo4 provides moderate corrosion resistance.
For aggressive environments, the following are recommended:
Hard Chrome Plating
Nickel Plating
Zinc Coating
Painting Systems
Hydraulic Oil Protection
Suitable environments:
Industrial workshops
Construction equipment
Mining systems
Agricultural machinery
Products Applications
Hydraulic Cylinder Manufacturing
Excavators
Loaders
Cranes
Forklifts
Bulldozers
01
Construction Machinery
Concrete Pumps
Pile Drivers
Road Machinery
02
Mining Equipment
Hydraulic Supports
Drilling Equipment
Ore Handling Systems
03
Agricultural Equipment
Tractors
Harvesters
Hydraulic Lifting Systems
04
Industrial Automation
Hydraulic Presses
Industrial Robots
Automation Equipment
05
Inspection & Quality Assurance
Every batch undergoes:
Raw Material Verification
Chemical Composition Testing
Mechanical Property Testing
Ultrasonic Testing (UT)
Eddy Current Testing
Bore Diameter Inspection
Surface Roughness Measurement
Straightness Inspection
Dimensional Verification
Third-Party Inspection Available
Quality Documents:
EN 10204 3.1 Certificate
Mill Test Certificate
Inspection Report
Packing List
Certificate of Origin
Packaging & Shipping
Export Packaging Options:
Anti-rust Oil Protection
Plastic End Caps
Waterproof Wrapping
Wooden Cases
Steel Frame Bundles
Seaworthy Export Packaging
Shipping Methods:
Container Shipping
Break Bulk Cargo
Air Freight
Railway Transportation
Why Choose Us
✓ 20+ Years Manufacturing Experience
✓ Hydraulic Cylinder Industry Expertise
✓ H7/H8/H9 Precision Honing Capability
✓ Customized Dimensions Available
✓ OEM & CNC Machining Service
✓ Fast Global Delivery
✓ Strict Quality Control
✓ Third-Party Inspection Support
✓ Competitive Factory Direct Pricing
✓ Professional Export Team
Frequently Asked Questions (FAQ)
1. Q: What is the primary advantage of using 42CrMo4 alloy steel over standard carbon steels like St52 for honed tubes in heavy-duty applications?
A: The core advantage lies in its superior strength-to-weight ratio and enhanced mechanical properties. 42CrMo4, a chromium-molybdenum alloy, can be quenched and tempered to achieve tensile strengths exceeding 1000 MPa, far surpassing St52. This provides exceptional resistance to deformation under ultra-high pressure, burst pressure, and heavy shock loads, making it indispensable in mining, construction, and press applications.
2. Q: The tube is supplied according to EN 10305-1. What does the "E" grade designation typically associated with this standard imply for a 42CrMo4 tube?
A: The "E" grade within EN 10305-1 specifies the tightest tolerances on dimensions (outer diameter and wall thickness). For a high-strength material like 42CrMo4, this is critical. It ensures superior concentricity and wall uniformity, which directly translates to even stress distribution under load, prevents localized high-stress points, and guarantees consistent piston seal performance throughout the tube's service life.
3. Q: How does the hardenability of 42CrMo4 impact the manufacturing process and final performance of the honed tube?
A: 42CrMo4's high hardenability, derived from its Chromium and Molybdenum content, allows it to achieve a through-hardened martensitic structure even in larger cross-sections. The tubes are typically supplied in a quenched and tempered condition (e.g., ~900 MPa tensile strength). The honing process is then performed on this hardened state, resulting in a tube that is not only incredibly strong but also possesses a highly wear-resistant internal surface that resists scoring and abrasion from contaminated hydraulic fluid.
4. Q: For applications involving welding, what specific procedures must be followed for 42CrMo4 honed tubes to prevent failure?
A: Welding 42CrMo4 is complex and requires strict procedure control due to its high carbon equivalent. It necessitates:
Pre-heating: Typically 250-350°C to slow the cooling rate.
Low-Hydrogen Electrodes: Using matching or high-toughness filler wires (e.g., EN 12070 or AWS ER100S-G).
Post-Weld Heat Treatment (PWHT): Mandatory stress relieving immediately after welding, typically at 550-600°C, to temper the brittle martensite formed in the Heat-Affected Zone (HAZ) and restore toughness.
5. Q: In what demanding environments is the 42CrMo4 honed tube particularly advantageous over other grades?
A: It excels in three key environments:
High Cyclic Fatigue Applications: Such as injection molding machines or stamping presses, where its high fatigue strength significantly extends service life.
Abrasive Conditions: Its inherent hardness resists wear from fine contaminants better than softer steels.
Applications with High Side Loads: The high yield strength prevents cylinder barrel distortion caused by external bending moments, which is common in poorly guided cylinders.
6. Q: What are the limitations of 42CrMo4 honed tubes regarding operating temperature?
A: While its room temperature strength is excellent, the tempered martensitic structure of 42CrMo4 begins to overtemper at sustained temperatures above approximately 400°C, leading to a gradual loss of hardness and strength. For continuous high-temperature service (e.g., above 250°C), alternative materials like heat-resistant stainless steels should be evaluated.
7. Q: Can 42CrMo4 honed tubes be further surface-treated to enhance performance?
A: Yes, two common treatments are:
Nitriding: This diffuses nitrogen into the surface, creating an extremely hard, wear-resistant case while maintaining a tough core. It is ideal for combating abrasive wear without the risk of flaking associated with hard chrome plating.
Phosphate Coating: Often used as a pre-lube treatment, it improves run-in characteristics and provides short-term corrosion resistance.
8. Q: How does the fatigue performance of a seamless 42CrMo4 tube compare to a welded and cold-drawn counterpart?
A: The seamless construction is fundamentally superior for fatigue-critical applications. It eliminates the longitudinal weld seam, which is a potential stress concentrator and a site for inclusions or microstructural inconsistencies. The homogeneous, isotropic structure of the seamless tube ensures consistent fatigue crack propagation resistance around its entire circumference, a critical factor for cylinders subjected to pulsating pressure cycles.
9. Q: What specific NDT methods are crucial for qualifying 42CrMo4 tubes for use in safety-critical applications?
A: Beyond standard checks, Ultrasonic Testing (UT) is paramount for detecting internal imperfections like laminations or inclusions that could act as initiation points for fatigue cracks in this high-strength material. For the honed ID, a combination of Eddy Current testing for surface flaws and a borescope inspection for a direct visual quality assessment of the finish is highly recommended.
10. Q: When specifying a 42CrMo4 tube, what mechanical properties beyond tensile strength should be critically evaluated?
A: For dynamic applications, Charpy V-Notch Impact Energy is a vital indicator of toughness and the material's ability to absorb shock loads without brittle fracture. Additionally, the Yield Strength (Rp0.2) is often more important than tensile strength for design, as it defines the permanent deformation limit. The hardness profile (e.g., HRC) should also be consistent to ensure uniform wear resistance.
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