Hydraulic cylinders require tubes with high strength, precise dimensions, smooth internal bore, and excellent wear resistance. Both ST52 and E355 are commonly used steel grades for honed tubes, but choosing the right one depends on your application requirements.
Material Overview
| Feature | ST52 Honed Tube | E355 Honed Tube |
|---|---|---|
| Steel Standard | DIN 2391 / EN 10305-1 | EN 10305-1 / ST52-3 equivalent |
| Material Type | High-strength structural steel | Carbon-manganese steel |
| Typical Tensile Strength (Rm) | 540–580 MPa | 580–600 MPa |
| Yield Strength (Rp0.2) | 355–390 MPa | 435–490 MPa |
| Elongation | 12–14 % | ≥10 % |
| Hardness (HB) | 160–190 | 170–220 |
| Heat Treatment | Normalized / Stress Relieved | Stress Relieved / +SR |
Machinability & Honing Performance
| Feature | ST52 | E355 |
|---|---|---|
| Bore Honing | Excellent | Excellent |
| Surface Finish (Ra) | ≤ 0.4 µm | ≤ 0.2–0.4 µm |
| Compatibility with Seals | Good | Superior (slightly smoother bore) |
| Ease of Machining | Very good | Good to very good |
Insight: Both grades are suitable for precision honing, but E355's higher strength allows longer service life under pressure, though it may be slightly harder to machine.
Wear & Fatigue Resistance
ST52: Adequate for standard hydraulic applications, moderate wear resistance.
E355: Higher yield strength and hardness improve fatigue resistance and longevity under repeated cycles.
Recommendation: For heavy-duty or high-pressure hydraulic cylinders, E355 is preferred. For standard applications where cost is a factor, ST52 is sufficient.
Cost Consideration
ST52: Generally lower cost; widely available.
E355: Slightly more expensive due to higher alloy quality and strength.
Tip: The cost difference is usually justified by longer service life and reduced maintenance for high-pressure applications.
Applications
| Tube Grade | Typical Use Cases |
|---|---|
| ST52 | Light to medium hydraulic cylinders, construction machinery, general industrial applications |
| E355 | Heavy-duty hydraulic cylinders, presses, lifting equipment, high-pressure industrial machinery |
Summary Recommendation
Choose ST52 Honed Tube if:
Your application is standard pressure hydraulic cylinders.
Cost-efficiency is a priority.
Moderate wear and service life are acceptable.
Choose E355 Honed Tube if:
You require high strength, wear resistance, and fatigue life.
The cylinder operates under high pressure or heavy load.
Long-term performance and durability are critical.
Verdict: For most modern hydraulic cylinder barrels, E355 is the superior choice, offering better strength, longer service life, and compatibility with high-precision sealing systems.
ST52 vs E355 Honed Tube FAQ
Q1: What is the difference between ST52 and E355 honed tubes?
A: Both are high-strength carbon steel tubes suitable for hydraulic cylinders. ST52 is standard structural steel (DIN 2391), while E355 has higher tensile and yield strength, better wear and fatigue resistance, and slightly smoother bore finish for demanding applications.
Q2: Which tube is stronger for hydraulic cylinders?
A: E355 has higher tensile strength (580–600 MPa) and yield strength (435–490 MPa) compared to ST52 (Rm 540–580 MPa, Rp0.2 355–390 MPa), making it better for high-pressure, heavy-duty cylinders.
Q3: Are both tubes suitable for precision honing?
A: Yes. Both ST52 and E355 can be honed or skived & roller burnished (SRB) to achieve ultra-smooth bores. E355's slightly higher strength allows longer service life under pressure.
Q4: Which tube is more cost-effective?
A: ST52 is usually cheaper and sufficient for standard-pressure hydraulic cylinders. E355 costs more but offers longer life and better performance under high load.
Q5: Can both tubes be used with seals and pistons?
A: Yes. E355's smoother honed bore provides better compatibility with O-rings, U-cups, and piston seals, reducing leakage and wear over time.
Q6: Which tube is better for high-pressure applications?
A: E355 is preferred due to higher yield strength and hardness, which improves fatigue resistance and reduces deformation under pressure.
Q7: Can either tube be chrome-plated?
A: Yes. Both ST52 and E355 can undergo internal chrome plating to enhance corrosion resistance and wear properties.
Q8: What are typical applications for each tube?
ST52: Light-to-medium hydraulic cylinders, construction equipment, general industrial use.
E355: Heavy-duty cylinders, industrial presses, lifting equipment, high-pressure hydraulic machinery.
Q9: How do I choose between ST52 and E355 for my project?
A: Consider:
Load & pressure: High pressure → E355
Service life: Long-term → E355
Budget: Standard → ST52
Sealing precision: Critical → E355
Q10: Are custom sizes and tolerances available for both?
A: Yes. Both grades can be supplied in various ID/OD ranges, wall thicknesses, and ISO H7/H8/H9 tolerances, with custom lengths upon request.
Contact Us
Xi'an Dongmeng Group Co., Ltd.
Your Trusted Supplier of ST52 & E355 Honed Tubes for Hydraulic Cylinders
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
