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Quality EN 10305-1 Seamless Precision Steel Tube E235 E355 Cold Drawn Tubing For Hydraulic Cylinders factory
Quality EN 10305-1 Seamless Precision Steel Tube E235 E355 Cold Drawn Tubing For Hydraulic Cylinders factory

EN 10305-1 Seamless Precision Steel Tube E235 E355 Cold Drawn Tubing For Hydraulic Cylinders

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

EN 10305-1 Seamless Precision Steel Tube
Product Summary
EN 10305-1 seamless precision steel tubes are cold-drawn seamless steel tubes manufactured to European standard specifications for precision applications. These tubes are characterized by precisely defined dimensional tolerances and specified maximum surface roughness, making them ideal for ...

Product Details

Highlight:

EN 10305-1 Seamless Precision Steel Tube

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Seamless Cold Drawn Tubes E235

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E355 Cold Drawn Seamless Tubing
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

EN 10305-1 seamless precision steel tubes are cold-drawn seamless steel tubes manufactured to European standard specifications for precision applications. These tubes are characterized by precisely defined dimensional tolerances and specified maximum surface roughness, making them ideal for applications requiring high accuracy and reliability

The standard covers circular cross-section tubes with outside diameters up to 380 mm, and may also be applied to other cross-section types. Typical applications span the automotive, furniture, and general engineering industries.

Specification Details
Standard EN10305-1
Materials E215, E235, E255, C35E, C45E, 25CrMo4, 42CrMo4
Type Seamless cold-drawn precision steel tube
Outside Diameter (OD) ≤ 380 mm (typically 6-114 mm)
Wall Thickness (WT) 0.5 mm – 60 mm
Length 5.8m, 6m, 11.8m, 12m, or cut to size
Manufacturing Process Cold drawn from hot finished seamless tubes
Surface Finish BK, BKW, BKS, GBK, NBK
Key Features
  • High dimensional accuracy – Tight tolerances on OD, ID, and wall thickness
  • Smooth surface finish – Specified maximum surface roughness values
  • Excellent mechanical properties – Consistent strength and ductility
  • Good machinability – Suitable for further processing (bending, flaring, swaging)
  • Pressure rated – Suitable for hydraulic and pneumatic systems
  • Full traceability – Inspection documents per EN 10204
  • Non-destructive testing – Eddy current, ultrasonic, or flux leakage testing available
EN 10305-1 Seamless Precision Steel Tube Chemical Composition

EN 10305-1 specifies three main steel grades for precision tubes:

Steel Grade Steel Number C max (%) Si max (%) Mn max (%) P max (%) S max (%)
E215 1.0212 0.10 0.05 0.70 0.025 0.015
E235 1.0308 0.17 0.35 1.20 0.025 0.015
E355 1.0580 0.22 0.55 1.60 0.025 0.015

*Source: EN 10305-1:2016*

Mechanical Properties
Steel Grade Yield Strength Rp0.2 (min MPa) Tensile Strength Rm (MPa) Elongation A (min %)
E215 215 290 – 430 30
E235 235 340 – 480 25
E355 355 490 – 630 22

*Source: EN 10305-1:2016*

Note on Delivery Conditions:

For tubes delivered in cold-finished conditions (BK/BKW), the yield point may be higher:

  • BK (cold-finished/hard) : ≥ 80% of tensile strength
  • BKW (cold-finished/soft) : ≥ 70% of tensile strength
  • GBK/NBK (annealed/normalized): Standard values apply
Delivery Conditions

EN 10305-1 defines five delivery conditions for precision tubes:

Symbol Term Description Deformability
BK Cold-finished/hard (as-drawn) No heat treatment after final cold forming Low
BKW Cold-finished/soft (lightly cold-worked) Light finishing pass after heat treatment Limited cold forming possible
BKS Cold-finished/soft stress-relieved Stress relieved after cold finishing Improved for cold forming
GBK Annealed Annealed in a controlled atmosphere or vacuum Good
NBK Normalized Normalized above the upper transformation point Best

GBK (+A) = Annealed in controlled atmosphere (bright annealed)
NBK (+N) = Normalized in controlled atmosphere

Dimensional Tolerances

Precision tubes according to EN 10305-1 feature strictly defined dimensional tolerances:

Parameter Tolerance Class
Outside Diameter (OD) ISO 7 (standard), ISO 8, ISO 9 available
Wall Thickness (WT) ±5% to ±10% depending on size
Length ±10mm (standard), closer tolerances available
Straightness 0.5 mm per 1000 mm (standard)
Surface Roughness (Ra) ≤ 1.6µm (for GBK/NBK condition)
Available Sizes (Common)
OD (mm) Wall Thickness (mm) Range Common Applications
6 1.0 – 2.0 Instrumentation, fuel lines
8 1.0 – 2.0 Hydraulic pilot lines
10 1.0 – 2.5 Pneumatic tubing
12 1.0 – 3.0 Injection pipes
14 1.5 – 3.0 Cylinder tubes
15 1.5 – 3.0 Hydraulic lines
16 1.5 – 4.0 Precision shafts
18 1.5 – 4.0 Telescopic tubes
20 2.0 – 5.0 Piston rods
22 2.0 – 5.0 Hydraulic cylinders
25 2.0 – 6.0 General engineering
28 2.5 – 6.0 Mechanical tubing
30 2.5 – 8.0 Structural applications
32 3.0 – 8.0 Heavy-duty cylinders
35 3.0 – 10.0 Pressure applications
38 3.0 – 10.0 Boiler tubes
40 3.0 – 12.0 Industrial machinery
42 3.0 – 12.0 Automotive components
45 3.5 – 14.0 Heavy machinery
50 4.0 – 15.0 Large cylinders
55 4.0 – 16.0 Special applications
60 5.0 – 18.0 Pressure vessels
63 5.0 – 20.0 Custom applications
70 5.0 – 20.0 Large diameter precision
76 6.0 – 25.0 Thick wall precision
80 6.0 – 25.0 High pressure
89 6.0 – 30.0 Heavy wall
100 8.0 – 35.0 Special order
114 8.0 – 40.0 Maximum standard size

Sizes up to 380mm OD available upon request.

Applications

EN 10305-1 seamless precision steel tubes are used across multiple industries:

Hydraulic Systems – Hydraulic cylinders, piston tubes, telescopic pipes, power steering tubes

Pneumatic Systems – Pneumatic cylinders, air line tubing, control systems

Automotive – Transmission shafts, fuel injection pipes, piston pins, ball cages, steering systems, drive shafts

Mechanical Engineering – Shafts, axles, cylinders, ring-shaped parts, stabilizer pipes

General Engineering – Machine frames, structural components, precision mechanisms

Furniture Industry – Office chair cylinders, adjustable mechanisms, telescopic legs

Special Applications – Heat exchangers, elevator tubes, gas bottles, pit props, pump pipes, textile machinery

Custom tolerances available upon request.

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