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Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of en 10305-1 e235 honed seamless steel tube in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.

EN 10305-1 E235 Honed Seamless Steel Tube

Our EN 10305-1 E235 honed seamless steel tubes are manufactured according to EN 10305-1 and ISO 1127 standards, providing exceptional roundness, dimensional accuracy, and smooth inner surfaces. These precision cold drawn tubes are the preferred choice for hydraulic cylinders, automotive shock absorbers, pneumatic systems, and mechanical engineering components worldwide.

Produced using advanced cold drawing and precision honing processes, our tubes achieve low surface roughness (Ra 0.4–1.0 μm), high concentricity, and excellent straightness, ensuring optimal performance under high-pressure conditions. With ISO 9001 certification and CE compliance, they are exported globally and trusted by engineers and procurement specialists for high-performance industrial applications.

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EN 10305-1 E235 Honed Seamless Steel Tube Chemical Properties

Pipe types	CHEMICAL COMPOSITION (LADLE ANALYSIS)
Pipe types	C%	Si%	Mn%	P%	S%	Cr%	Mo%	V%	Inne%	Cr+ Mo+ Ni Max%	Al.%
E235	<\=0,17	<\=0,35	<\=1,20	<\=0,025	<\=0,025	-	-	-	-	-	0,020- 0,060
E255	<\=0,21	<\=0,35	0,40-1,10	<\=0,025	<\=0,025	-	-	-	-	-	0,020- 0,060
E355	<\=0,22	<\=0,55	<\=1,60	<\=0,025	<\=0,025	-	-	-	-	-	0,020- 0,060
C35E	0,32-0,39	<\=0,40	0,50-0,80	0,035	<\=0,035	<\=0,40	<\=0,10	-	-	0,63	-
C45E	0,42-0,55	<\=0,40	0,50-0,80	0,035	<\=0,035	<\=0,40	<\=0,10	-	-	0,63	-

EN 10305-1 E235 Honed Seamless Steel Tube Mechanical Properties

Yield Strength		Tensile Strength			Elongation A5 min
MPa min	ksi min	MPa min	MPa min	ksi min	Percentage
		340	480	–	25

EN 10305-1 E235 Honed Seamless Steel Tube Types

Pipe types	Steel grades	Resistance properties
		+C		+LC		+SR			+A		+N
		Rm [MPa]	A%	Rm [MPa]	A%	Rm [MPa]	Re [MPa]	A%	Rm [MPa]	A%	Rm [MPa]	Re [MPa]	A%
Precision E235, E255, E355 According to PN-EN 10305-1	E235	480	6	420	10	420	350	16	315	25	340- 480	235	25
	E255	580	5	520	8	520	375	12	390	21	440- 570	255	21
	E355	640	4	580	7	580	450	10	450	22	490- 630	355	22
	C34E	590	5	540	7	-	-	-	440	22	>\= 460	280	21
	C45E	720	4	670	6	-	-	-	510	20	>\= 540	340	18

Manufacturing Process & Technology

Cold Drawing Process: Increases tensile strength and ensures high dimensional accuracy.

Precision Honing: Achieves smooth inner surfaces, minimal friction, and high concentricity.

Straightness & Roundness Control: Every tube is tested to meet EN 10305-1 tolerances.

Quality Assurance: ISO 9001 certified, full inspection, third-party verification available.

Advanced Testing: Dimensional, hardness, and mechanical property testing ensures reliability for high-pressure applications.

Applications

Hydraulic Cylinder Rods & Sleeves – Smooth ID for minimal friction and precise sealing.

Automotive Shock Absorbers & Pistons – High concentricity ensures durability under dynamic load.

Mechanical Bearings & Bushings – Precision machining compatibility.

Pneumatic Actuators & Industrial Equipment – Reliable performance in high-pressure systems.

Heavy Machinery & High-Pressure Systems – Strong, fatigue-resistant E235 steel.

Visual Suggestion: 6-grid image showing tubes in automotive, hydraulic, mechanical, pneumatic, heavy machinery, and export applications.

Global Export & Market Reach

Our EN 10305-1 E235 honed seamless steel tubes are exported to:

North America: USA, Canada, Mexico

Europe: Germany, UK, France

Middle East: UAE, Saudi Arabia

Asia & Oceania: Australia, Vietnam, Malaysia, Singapore

Trusted by top hydraulic, automotive, and mechanical engineering companies worldwide.

FAQ: EN 10305-1 E235 Honed Seamless Steel Tube

1. What is the main advantage of using E235 grade over higher-strength grades like E355 for hydraulic cylinders?
The primary advantage of E235 is its exceptional weldability and formability. With a lower carbon equivalent, it can be welded easily without pre- or post-heating under normal conditions, minimizing fabrication complexity and cost. This makes it the ideal choice for cylinders where the barrel needs to be welded to end caps or mounting brackets, and where extreme tensile strength is not the critical requirement.

2. What does the "Honed" finish achieve on the inner diameter (ID)?
The honed process creates a superior internal surface characterized by a cross-hatched pattern. This provides an exceptionally smooth surface finish (typically Ra 0.2 - 0.8 µm) for piston seals to travel against, which minimizes friction and wear, improves lubrication retention, and eliminates the need for further internal machining. This "ready-to-use" state significantly reduces your production time and cost.

3. Why choose a seamless tube over a welded and honed tube?
Seamless tubes (CDS) have no longitudinal weld seam. This eliminates a potential weak point for fatigue failure, ensures uniform mechanical properties and hardness around the entire circumference, and provides superior pressure integrity and concentricity. For reliable, high-performance cylinders in demanding applications, seamless construction offers unparalleled safety and longevity.

4. How does EN 10305-1 ensure dimensional quality?
The EN 10305-1 standard specifies exceptionally tight tolerances for precision steel tubes. Tubes supplied to this standard, including our E235 honed grade, guarantee outstanding consistency on outer diameter (e.g., h9), wall thickness (e.g., T3), and straightness. This precision ensures easy assembly, reliable seal performance, and consistent quality in your manufacturing process.

5. Are these tubes delivered ready for production?
Yes. Our EN 10305-1 E235 Honed Tubes are supplied as finished components. They are thoroughly cleaned, degreased, and the pristine honed ID is protected with end caps to prevent contamination during transit. They can be integrated directly into your cylinder assembly line upon delivery.

6. Can you supply custom lengths and diameters?
Absolutely. We specialize in providing solutions tailored to your needs. We can supply custom-cut lengths to minimize your waste and can source tubes in a wide range of standard and non-standard outer diameters and wall thicknesses. Please consult with our technical sales team for your specific requirements.

7. What is the typical surface roughness (Ra) value you guarantee?
A standard honed finish for hydraulic applications is typically between Ra 0.2 µm and Ra 0.4 µm. We can provide and guarantee specific Ra values based on your application's needs to ensure optimal seal compatibility and system performance.

8. Is the E235 grade suitable for chrome plating?
Yes, the E235 grade is an excellent substrate for chrome plating. Its homogeneous seamless structure and smooth honed finish provide a perfect, uniform base for plating, ensuring high-quality adhesion and a flawless final surface for piston rods or other plated components.

9. How does EN 10305-1 E235 compare to DIN 2391-1 St35 tubes?
EN 10305-1 is the modern European standard that supersedes the older DIN 2391 standard. While the chemical composition of E235 and St35 is similar, EN 10305-1 generally imposes more stringent and comprehensive requirements on dimensional tolerances and testing, ensuring a higher and more consistent level of product quality.

10. What certifications do you provide with the material?
We supply material with full traceability and can provide a 3.1 Material Test Certificate according to EN 10204, which validates the chemical composition and mechanical properties against the EN 10305-1 E235 standard. This ensures full quality assurance for your critical applications.